JP6676664B2 - Method and apparatus for manufacturing sheet-like member according to absorbent article - Google Patents

Description

  The present invention relates to a method and an apparatus for manufacturing a sheet-like member for an absorbent article such as a disposable diaper.

  Conventionally, on a production line for absorbent articles such as disposable diapers that absorb excrement such as urine, a plurality of through holes are formed in a continuous sheet continuous in the transport direction for the purpose of imparting air permeability to the absorbent articles. May be performed. As an example of the forming method, Patent Literature 1 discloses that a plurality of pushing members protrudingly formed on an outer peripheral surface of a rotating roll are pushed into the continuous sheet in a thickness direction.

JP-A-2003-171866

  On the other hand, in the same production line, a plurality of through holes may be formed in the following composite sheet. That is, the composite sheet first has a first nonwoven fabric that is continuous in the transport direction, and a second nonwoven fabric that is arranged in the thickness direction of the composite sheet so as to overlap the first nonwoven fabric and is continuous in the transport direction. Then, between the first nonwoven fabric and the second nonwoven fabric, a plurality of elastic members extending in the transport direction in the transport direction are inserted while being arranged in the CD direction intersecting the transport direction. , At least to the first nonwoven fabric or the second nonwoven fabric.

  However, when the pushing member is pushed into the composite sheet to form the through-hole, the fibers displaced by the pushing member in the first and second nonwoven fabrics are excessively unevenly distributed at the edge of the through-hole, or the fibers are separated by the same edge. Is excessively strongly entangled or the like, whereby the composite sheet may be in an inappropriate state in which the influence of the processing for forming the through-holes remains excessively. If the composite sheet is further processed in such an inappropriate state, the processing may become unstable, and the processing accuracy may be degraded.

  In addition, excessive uneven distribution of fibers at the edge of the through-hole as described above may cause deterioration in touch feeling at the edge of the through-hole, but a plurality of processing steps downstream in the transport direction in the same state may be performed. Then, when the diaper is manufactured, there is a possibility that a diaper having an uncomfortable touch is finally manufactured.

  In this regard, it is effective to loosen the fibers at the edge of the through hole of the composite sheet at a position on the upstream side in the transport direction from the processing step as a method of improving the problem of the edge of the through hole as described above. Probably.

  The present invention has been made in view of the above-described conventional problems, and its object is to provide a method in which the fibers at the edges of the through holes formed in the composite sheet reach a predetermined processing step. To loosen the edge fibers quickly.

The main invention for achieving the above object is:
A method for manufacturing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet, while being extended in the predetermined direction. A plurality of elastic members along the predetermined direction, the composite sheet is inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, a conveying step of conveying the predetermined direction as the conveying direction,
A through-hole that penetrates the composite sheet in the thickness direction by pushing a pushing member in the thickness direction at a position between the elastic members adjacent to each other in the CD direction in the composite sheet; Forming step;
A CD-direction tension applying step of applying a tension in the CD direction to the composite sheet at a position on the downstream side in the transport direction from a through-hole forming processing position at which the through-hole is formed in the through-hole forming step;
A processing step of processing the composite sheet at a position downstream of the tension applying position for applying the tension in the CD direction tension applying step in the transport direction. It is a manufacturing method of a sheet-shaped member.

Also,
An apparatus for manufacturing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet, while being extended in the predetermined direction. A plurality of elastic members along the predetermined direction, the composite sheet inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, a conveying device that conveys the predetermined direction as the conveying direction,
A through-hole that penetrates the composite sheet in the thickness direction by pushing a pushing member in the thickness direction at a position between the elastic members adjacent to each other in the CD direction in the composite sheet; A forming device;
A CD-direction tension applying device for applying a tension in the CD direction to the composite sheet at a position downstream of the through-hole forming processing position at which the through-hole forming device forms the through-hole in the composite sheet in the transport direction; When,
A processing device that performs processing on the composite sheet at a position downstream in the transport direction from a tension application position where the CD-direction tension applying device applies the tension in the CD direction to the composite sheet. It is an apparatus for manufacturing a sheet-like member according to a characteristic absorbent article.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, before the fiber of the edge part of the through-hole formed in the composite sheet reaches a predetermined processing process, the fiber of the said edge part can be loosened quickly.

It is the schematic perspective view which looked at the three-piece type disposable diaper 1 as an example of an absorptive article from the ventral side in a pants type state. It is the schematic plan view which looked at the same diaper 1 of the deployment state from the skin side. FIG. 3 is a sectional view taken along the line III-III in FIG. 2. It is the schematic plan view which looked at the abdominal band member 31 from the non-skin side of the thickness direction. FIG. 5A is a schematic enlarged view of the ventilation hole h according to the first embodiment viewed from the non-skin side in the thickness direction, and FIG. 5B is a cross-sectional view taken along the line BB in FIG. 5A. FIG. 4 is a schematic plan view of the production line for explaining various processes performed in the production line. It is a schematic plan view of 1m of intermediate products just before it is conveyed to the vent hole formation process S50. It is a schematic plan view of 1 m of intermediate products immediately after passing through the vent hole formation process S50. 8A is a schematic plan view of the continuum 31a of the abdominal band member immediately before being conveyed to the abdominal thread rubber cutting step S80, and FIG. 8B is a continuation of the abdominal band member during and after passing through the step S80. It is a schematic plan view of the body 31a. FIG. 2 is a schematic side view of a vent forming apparatus 50 showing a part of the configuration in a longitudinal sectional view. FIG. 10 is a schematic enlarged view as viewed from arrows XX in FIG. 9. FIG. 9 is an explanatory diagram of an arrangement pattern of a pin member 55p on an outer peripheral surface of an intermediate roll 55. It is explanatory drawing of the arrangement pattern of the hole part 51h in the outer peripheral surface of the upstream side roll 51. FIG. 13A is an enlarged view of a portion XIIIa in FIG. 11, and FIG. 13B is a view taken in the direction of arrows BB in FIG. 13A. FIG. 14A is a schematic plan view showing the CD direction tension applying device 60 in an enlarged manner, and FIG. 14B is a view taken in the direction of arrows BB in FIG. 14A. FIG. 15A is a schematic side view of the abdominal cutter device 80, and FIG. 15B is a view taken in the direction of arrows BB in FIG. 15A. It is a schematic explanatory view of the manufacturing method of the second embodiment. It is a schematic explanatory view of a manufacturing method of a third embodiment.

At least the following matters will be made clear by the description in the present specification and the accompanying drawings.
A method for manufacturing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet, while being extended in the predetermined direction. A plurality of elastic members along the predetermined direction, the composite sheet is inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, a conveying step of conveying the predetermined direction as the conveying direction,
A through-hole that penetrates the composite sheet in the thickness direction by pushing a pushing member in the thickness direction at a position between the elastic members adjacent to each other in the CD direction in the composite sheet; Forming step;
A CD-direction tension applying step of applying a tension in the CD direction to the composite sheet at a position on the downstream side in the transport direction from a through-hole forming processing position at which the through-hole is formed in the through-hole forming step;
A processing step of processing the composite sheet at a position downstream of the tension applying position for applying the tension in the CD direction tension applying step in the transport direction. It is a manufacturing method of a sheet-shaped member.

  According to the method for manufacturing a sheet-like member according to such an absorbent article, the tension applying position is located between the through-hole forming processing position and the processing position in the processing step in the transport direction. ing. Therefore, before the fiber at the edge of the through hole formed in the composite sheet in the through hole forming step reaches the above-described processing step, the fiber at the edge is tensioned in the CD direction at the tension applying position. Can be loosened quickly.

A method for manufacturing a sheet-like member according to the absorbent article,
On the downstream side in the transport direction from the through-hole formation processing position, has a plurality of the processing steps,
The tension applying position in the CD-direction tension applying step is located between the through-hole forming processing position and a processing step closest to the through-hole forming processing position among the plurality of processing steps. It is desirable.

  According to the method of manufacturing a sheet-like member for such an absorbent article, a tension in the CD direction is applied to the composite sheet at a position immediately downstream of the through-hole forming processing position. Therefore, from the most upstream processing step of the plurality of processing steps located downstream of the through-hole forming processing position, the state of the composite sheet is set to an appropriate state in which the fibers at the edges of the through-hole are loosened. be able to. Thus, the composite sheet can be processed with high processing accuracy from the most upstream processing step.

A method for manufacturing a sheet-like member according to the absorbent article,
It is preferable that there is no separate member fixing step of fixing another member to the composite sheet at a position upstream of the tension applying position in the CD direction tension applying step in the transport direction.

  According to the method for manufacturing a sheet-like member according to such an absorbent article, a tension in the CD direction is applied to the composite sheet before fixing another member. Therefore, a defect that occurs when the tension in the CD direction is applied after the fixing of another member, that is, the tension is difficult to be transmitted to the composite sheet due to the tension being received by another member, and the through-hole of the sheet It is possible to effectively prevent the action of loosening the fibers at the edges from being reduced.

A method for manufacturing a sheet-like member according to the absorbent article,
The first nonwoven fabric and the second nonwoven fabric both contain thermoplastic resin fibers,
In the through-hole forming step, the pushing member protrudingly formed on the outer peripheral surface of the first rotator rotating along the transport direction is provided on the outer peripheral surface of the second rotator rotating along the transport direction. When inserted into the hole, the pushing member is pushed into the composite sheet to form the through hole,
At least one of the first rotating body and the second rotating body is heated, and the composite sheet is heated by the rotating body,
In the CD-direction tension applying step, it is preferable that the tension in the CD direction is applied to the composite sheet in a state where the temperature is higher than the temperature of the composite sheet before being heated by the rotating body.

  According to the method of manufacturing a sheet-like member for such an absorbent article, a tension in the CD direction is applied to the composite sheet in a state where the temperature of the composite sheet is high. Therefore, the fibers at the edge of the through hole of the sheet can be loosened in a softened state, and thereby the fibers can be easily loosened.

A method for manufacturing a sheet-like member according to the absorbent article,
It is desirable that the dimension of the composite sheet in the CD direction at the tension applying position is equal to or larger than the dimension of the composite sheet in the CD direction at the through hole forming processing position.

  According to the method for manufacturing a sheet-like member according to such an absorbent article, the dimension of the composite sheet in the CD direction at the tension applying position in the CD direction tension applying step is set in the through hole forming processing position in the through hole forming step. Of the composite sheet in the CD direction. Accordingly, the dimension of the composite sheet, which can be reduced due to the transport tension during the transport from the through-hole forming processing position to the tension applying position, is set at least in the CD direction when the through-hole is formed. Up to the size of Thus, in the CD-direction tension applying step, the tension in the CD direction can be reliably applied to the composite sheet, and as a result, the fibers at the edges of the through holes of the composite sheet can be reliably loosened.

A method for manufacturing a sheet-like member according to the absorbent article,
In the CD-direction tension applying step, the tension in the CD direction is applied such that the dimension in the CD direction of the through hole at the tension applying position is larger than the dimension in the CD direction of the pushing member. It is desirable to do.

According to the method for manufacturing a sheet-like member according to such an absorbent article, the CD in such a manner that the dimension in the CD direction of the through hole at the tension applying position is larger than the dimension in the CD direction of the pushing member. In the direction tension applying step, a tension in the CD direction is applied to the composite sheet. Therefore, while the composite sheet is conveyed from the through-hole forming position in the through-hole forming process to the tension applying position in the CD-direction tension applying process, the composite sheet in the CD direction that can be reduced due to the conveying tension is conveyed. The dimension can be increased to at least the dimension in the CD direction when the through hole is formed. Thus, in the CD-direction tension applying step, the tension in the CD direction can be reliably applied to the composite sheet, and as a result, the fibers at the edges of the through holes of the composite sheet can be reliably loosened.

A method for manufacturing a sheet-like member according to the absorbent article,
On the upstream side in the transport direction from the through-hole forming processing position, a separate CD-direction tension applying step of applying tension to the composite sheet in the CD direction is provided,
In the through-hole forming step, it is preferable that the through-hole is formed in the composite sheet in a state where the tension in the CD direction is applied.

  According to the method for manufacturing a sheet-like member according to such an absorbent article, the composite sheet has an elastic member, and when the composite sheet is transported in the transport direction, the composite sheet is used as a transport tension. A tension is applied to the sheet in a direction along the conveying direction. Therefore, the sheet can be contracted in the CD direction by the extent that the composite sheet is elongated in the conveying direction by the conveying tension. Due to this shrinkage, the fibers of the composite sheet as a whole are shifted from the end side in the CD direction to the center side, and as a result, the composite sheet is in a state where the density of the fiber distribution is biased in the CD direction. When a through-hole is formed in the composite sheet in an inappropriate state having such density, the formation of the through-hole becomes unstable, and the precision of forming the through-hole may be reduced. According to the manufacturing method of (1), a through hole is formed in the composite sheet in a state where tension in the CD direction is applied to the composite sheet. Therefore, at the time of forming the through-hole, the composite sheet is changed from the inappropriate state in which the density of the fiber distribution is biased in the CD direction to the appropriate state in which the bias in the density is reduced, whereby the Forming accuracy can be increased.

Also,
An apparatus for manufacturing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet, while being extended in the predetermined direction. A plurality of elastic members along the predetermined direction, the composite sheet inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, a conveying device that conveys the predetermined direction as the conveying direction,
A through-hole that penetrates the composite sheet in the thickness direction by pushing a pushing member in the thickness direction at a position between the elastic members adjacent to each other in the CD direction in the composite sheet; A forming device;
A CD-direction tension applying device for applying a tension in the CD direction to the composite sheet at a position downstream of the through-hole forming processing position at which the through-hole forming device forms the through-hole in the composite sheet in the transport direction; When,
A processing device that performs processing on the composite sheet at a position downstream in the transport direction from a tension application position where the CD-direction tension applying device applies the tension in the CD direction to the composite sheet. It is an apparatus for manufacturing a sheet-like member according to a characteristic absorbent article.

  According to the apparatus for manufacturing a sheet-like member according to such an absorbent article, the same operation and effect as in the case of the above-described manufacturing method can be obtained.

=== First Embodiment ===
The method and apparatus for manufacturing a sheet-like member according to the absorbent article of the first embodiment are used, for example, in a production line for a disposable diaper 1 as an example of an absorbent article. FIG. 1 is a schematic perspective view of a three-piece diaper 1 as an example of a disposable diaper 1 viewed from the ventral side in a pants-type state. FIG. 2 is a schematic plan view of the diaper 1 in the unfolded state as viewed from the skin side, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG.

The diaper 1 has three directions perpendicular to each other in the pants-type state shown in FIG. 1, including a vertical direction, a lateral direction, and a front-rear direction. In the following, in the pants-type state, the upper and lower sides in the up-down direction are also referred to as “the waist opening side” and the “crotch side”, respectively, and the front side and the rear side in the front-rear direction are respectively referred to as “ Also called "ventral" and "dorsal".
On the other hand, in the unfolded state of FIGS. 2 and 3, the diaper 1 has three directions orthogonal to each other: a vertical direction, a horizontal direction, and a thickness direction. Hereinafter, in the unfolded state, the one side and the other side in the vertical direction are also referred to as “abdominal side” and “dorsal side”, respectively, and the one side and the other side in the thickness direction are referred to as “skin”, respectively. Side "and" non-skin side ".
Incidentally, the lateral direction has the same meaning in the pants-type state and the deployed state. The vertical direction of the unfolded state is along the vertical direction of the pants-type state, and the thickness direction of the unfolded state is along the front-back direction of the pants-type state.
Further, in the unfolded state shown in FIGS. 2 and 3, the diaper 1 is assumed to have virtually no contraction force due to thread rubbers 16, 35 and 45 as elastic members for imparting elasticity to the diaper 1 in a state where the diaper 1 is virtually spread. 1 is shown.

Since the diaper 1 is of a so-called three-piece type, in the unfolded state in FIG. A back band member 41 is provided as a third component. More specifically, in a state in which the abdominal band member 31 and the back side band member 41 are arranged in parallel with a gap in the vertical direction, the absorbent body 10 is stretched between the two members 31 and 41, and the absorbent body 10 The longitudinal ends 10ea and 10eb of the main body 10 are respectively fixed to the nearest band members 31 and 41, and the external shape thereof is substantially H-shaped in plan view.
Then, from the expanded state of the substantially H shape, the absorbent body 10 is folded in two with the predetermined position CL10 in the longitudinal direction of the absorbent body 10 (a position corresponding to the central position CL1 of the diaper 1 in the longitudinal direction) as a folding position. In addition, when the band members 31 and 41 facing each other are joined to each other at the lateral ends 31e and 41e by welding or the like in the folded state, the band members 31 and 41 are connected in a ring shape. Thus, the pants-type diaper 1 in which the waist opening BH and the pair of leg openings LH, LH are formed as shown in FIG. 1 is obtained.

  2 and 3, the absorbent main body 10 has a substantially rectangular shape in plan view. And the longitudinal direction of the absorbent main body 10 is arrange | positioned so that it may extend along a longitudinal direction. In addition, the absorbent body 10 includes an absorber 11, a top sheet 13 provided to cover the absorber 11 from the skin side, and a back sheet 15 provided to cover the absorber 11 from the non-skin side. It has.

  The absorber 11 has a liquid-absorbent absorbent core 11c and a core wrap sheet such as a tissue paper (not shown) that covers the outer peripheral surface of the core 11c. The absorbent core 11c is a molded body formed by molding a predetermined liquid absorbent material into an approximately hourglass shape as an example of a predetermined shape in plan view. Examples of the liquid-absorbing material include liquid-absorbing fibers such as pulp fibers and liquid-absorbing particulates such as superabsorbent polymers (so-called SAP).

The top sheet 13 is a liquid-permeable sheet such as a nonwoven fabric having a flat size that protrudes from the absorber 11 in the vertical and horizontal directions. Further, the back sheet 15 is also a sheet having a planar size that protrudes from the absorber 11 in the vertical direction and the horizontal direction, and an example thereof is a laminate sheet 15 having a two-layer structure as shown in FIG. That is, the laminate sheet 15 has a liquid-impermeable leak-proof sheet 15a such as a polyethylene film (PE) or a polypropylene film (PP) on the skin side, and a nonwoven fabric exterior sheet 15b on the non-skin side. have.
Then, in a state where the absorber 11 is sandwiched between the top sheet 13 and the back sheet 15, the two sheets 13, 15 are adhered to each other in a frame shape at portions protruding from the absorber 11 in the vertical and horizontal directions. The absorbent main body 10 is formed by being joined by welding or welding. Note that the back sheet 15 may have only the leak-proof sheet 15a without having the exterior sheet 15b.

  Further, as in the example of FIG. 2, each of the portions 10LG in the absorbent main body 10 outside the absorber 11 in the horizontal direction may be provided with leg gathers LG that expand and contract in the vertical direction. The leg gathers LG constitute a part of the leg opening LH. The elasticity of the leg gathers LG is provided by fixing the thread rubber 16 as an elastic member to each of the portions 10LG in the longitudinal direction along the longitudinal direction. In addition to the leg gathers LG, so-called three-dimensional gathers (not shown) may be provided on both sides in the lateral direction of the absorbent main body 10 for the purpose of preventing lateral leakage.

  On the other hand, as shown in FIG. 2, the abdominal band member 31 is a sheet member having a substantially rectangular shape in plan view made of nonwoven fabrics 32 and 33. In this example, as shown in FIG. 3, the abdominal band member 31 is formed by joining two nonwoven fabrics 32 and 33 with a hot melt adhesive. Then, as shown in FIGS. 2 and 3, the lateral central portion of the abdominal band member 31 is overlapped and joined to the longitudinal abdominal end 10 ea of the absorbent main body 10 from the non-skin side. .

  Further, the back side band member 41 is also a sheet member having a substantially rectangular shape in a plan view made of nonwoven fabrics 42 and 43 as in the case of the abdominal side band member 31. In this example, as shown in FIG. The back side band member 41 is formed by joining the nonwoven fabrics 42 and 43 in two layers. Then, as shown in FIGS. 2 and 3, the lateral center portion of the back side band member 41 is overlapped and joined to the longitudinal back side end 10eb of the absorbent main body 10 from the non-skin side. .

  The contents described below are common to both the abdominal band member 31 and the dorsal band member 41. Therefore, here, only the abdominal band member 31 will be described as a representative, and the corresponding members of the dorsal band member 41 will only be indicated in parentheses.

  As shown in FIGS. 2 and 3, a plurality of thread rubbers are provided between the two nonwoven fabrics 32, 33 (42, 43) of the abdominal band member 31 (41) as elastic members extending in the lateral direction. (45, 45...) Are interposed in the vertical direction, and are joined and fixed to the nonwoven fabrics 32, 33 (42, 43) with a hot melt adhesive while extending in the horizontal direction. Thereby, the abdominal band member 31 (41) is provided with lateral elasticity.

Further, in this example, as shown in FIG. 2, at least a part (for example, a central part in the lateral direction) of the abdominal band member 31 (41) overlapping with the absorbent core 11 c has wrinkles of the absorber 11. The thread rubber 35 (45) is discontinuous for the purpose of preventing generation and the like. As a result, no elasticity is imparted to this portion.
That is, as shown in a schematic plan view of the abdominal band member 31 in FIG. 4 as viewed from the non-skin side in the thickness direction, the abdominal band member 31 (41) is vertically divided into two regions AU and AD, When the area AU located on the waist opening BH side in the vertical direction is referred to as “upper area AU” and the area AD located on the crotch side is referred to as “lower area AD”, the former upper area AU The absorbent core 11c of the absorbent main body 10 does not substantially overlap with the AU. Therefore, the upper region AU is provided with elasticity over substantially the entire length in the lateral direction. That is, in the upper region AU, the thread rubbers 35 are provided over substantially the entire length in the lateral direction.

  On the other hand, in the latter lower region AD, since the absorbent core 11c of the absorbent main body 10 overlaps the lateral central region ADc, thread rubbers 35, 35,... As a result, a non-stretchable area AL having almost no lateral elasticity exists in the center of the center area ADc. However, since the absorbent cores 11c do not substantially overlap the end regions ADe, ADe located on both sides of the central region ADc, the end regions ADe, ADe have thread rubbers 35, 35,. 45...), Whereby the same end side regions ADe, ADe are elastic regions AH, AH having higher elasticity than the non-elastic region AL. The formation of the non-stretchable region AL and the stretchable region AH in the lower region AD is realized by the continuous body 35a (45a) of thread rubber disposed transversely across the central portion described above (see FIG. 8A and 8B) is cut at the center, and such a cutting process will be described later.

  The fineness of the thread rubber 35 (45) can be, for example, 400 dtex to 1000 dtex, and a specific example of the thread rubber 35 (45) is LYCRA (trademark). However, it is not limited to this.

  Further, in this example, as shown in FIG. 3, the planar size of the nonwoven fabric 33 (43) located on the non-skin side in the thickness direction of the two nonwoven fabrics 32, 33 (42, 43) is The size is such that it protrudes outward in the vertical direction from the nonwoven fabric 32 (42) located at the position. The protruding portion of the former nonwoven fabric 33 (43) is folded inward in the vertical direction, and this folded portion 33B (43B) is formed into the longitudinal end 32Le (42Le) of the latter nonwoven fabric 32 (42). Is covered from the skin side, but nothing is limited to this.

  As shown in FIGS. 2 and 4, on both sides of the abdominal band member 31 (41) in the lateral direction, including the end region ADe, portions 31 s where the absorbent main body 10 is not overlapped. (41s) (hereinafter also referred to as absorptive body non-existent portion 31s (41s)) is present, but the absorbent body non-existent portion 31s (41s) is provided with the same purpose in order to improve the air permeability. A plurality of ventilation holes h (h) penetrating the non-existing portion 31s (41s) are discretely formed in a predetermined arrangement pattern, whereby the ventilation holes h (h) are a group of the ventilation holes h. It forms a ventilation hole group Gh31 (Gh41). That is, in this example, the plurality of ventilation holes h, h... (Each at the position between the thread rubbers 35, 35 (45, 45) adjacent in the longitudinal direction in the absorbent body non-existent portion 31s (41s). h, h...) are formed side by side at a predetermined forming pitch in the horizontal direction, whereby the ventilation holes h, h... (h, h. ). Further, the vertically adjacent ventilation hole rows Rh31, Rh31 (Rh41, Rh41) are shifted from each other in the horizontal direction by half the formation pitch. .. (H, h...) Form a group of ventilation holes Gh31 (Gh41) arranged in a generally staggered arrangement. However, it is not limited to this. For example, the ventilation holes h, h ... (h, h ...) may be formed in a lattice arrangement.

  Further, in this example, each of the ventilation holes h, h... Is formed as a target opening shape having a diameter of, for example, 0.2 mm to 3 mm as a target opening shape. There are also pores h, h. The diameter of such a non-circular vent h varies depending on the position of the vent h in the circumferential direction, and such a varying diameter is, for example, in the range of 0.2 mm to 3 mm. Is in. Therefore, each of the ventilation holes h can quickly achieve the desired air permeability. However, the target opening shape of the ventilation hole h is not limited to the above-described perfect circle. For example, polygons such as equilateral triangles and squares may be used.

  5A shows a schematic enlarged view of the ventilation hole h as viewed from the non-skin side in the thickness direction, and FIG. 5B shows a cross-sectional view taken along the line BB in FIG. 5A. As can be seen from the above, a burr B protrudes from the edge he of the ventilation hole h. That is, in the non-woven fabric 32, 33 (42, 43), the fibers pushed out by the pin members 55p described later are densely present in the same edge portion he. Are also unevenly distributed portions where many fibers are present, and the edge portion he is a high entanglement strength portion in which constituent fibers are strongly entangled. If such uneven distribution or confounding strength is excessive, the problem described at the beginning may occur. Therefore, the manufacturing line of the diaper 1 to be described later is provided with the step S60 (FIG. 6) of loosening the fibers of the edge he, whereby the uneven distribution of the fibers at the edge he is alleviated in the diaper 1. Have been.

  Furthermore, in this example, both of the two nonwoven fabrics 32 and 33 of the abdominal band member 31 and the two nonwoven fabrics 42 and 43 of the backband member 41 are spunbond nonwoven fabrics. However, the present invention is not limited to this, and another type of nonwoven fabric such as an SMS (spunbond / meltblown / spunbond) nonwoven fabric may be used. In this example, a single fiber of polypropylene (PP), which is a typical example of a thermoplastic resin, is used as a constituent fiber of the nonwoven fabric. However, the present invention is not limited to this. For example, a single fiber of another thermoplastic resin such as polyethylene (PE) may be used, or a composite fiber such as a sheath-core structure of PE and PP may be used.

  Such a diaper 1 is manufactured on a manufacturing line. In the same line, an intermediate product 1m of the diaper 1 is transported along a predetermined transport direction (corresponding to a transport step). During the transportation, the intermediate product 1m is subjected to various processes, and each time the respective processes are performed, the form of the intermediate product 1m is sequentially changed, and finally, as shown in FIG. Diaper 1 is completed.

  Hereinafter, the width direction of the manufacturing line is also referred to as “CD direction”. In this example, the CD direction is along the horizontal direction. In the production line, the intermediate product 1m is transported with an arbitrary direction in a plane orthogonal to the CD direction as a transport direction. That is, the transport direction is a direction defined by both the vertical up-down direction and the horizontal front-back direction. Note that the “vertical direction” and the “front-rear direction” here are different directions that are not directly related to the “vertical direction” and the “front-rear direction” used in the description of the diaper 1 described above, respectively.

  The intermediate product 1m is transported by a suitable transport device such as a belt conveyor or a transport roller. Therefore, unless otherwise specified, it is assumed that the intermediate product 1m is transported in the transport direction by these transport devices. In addition, as an example of the belt conveyor, a normal belt conveyor having an endless belt that rotates and drives as a conveying surface, a suction belt conveyor having an adsorption function on an outer peripheral surface of the endless belt, and the like can be given.

  FIG. 6 is a schematic plan view of the production line for explaining various processes performed in the production line. The production line includes a vent forming step S50 (corresponding to a through-hole forming step), a CD-direction tension applying step S60, a slitting step S70 (corresponding to a processing step), a spacing forming step S75 (corresponding to a processing step), An abdominal thread rubber cutting step S80 (corresponding to a processing step), a dorsal thread rubber cutting step S90 (corresponding to a processing step), and an absorbent body mounting step S100 (corresponding to a processing step and a separate member fixing step) It has a folding step S110 (corresponding to a processing step), a side sealing step S120 (corresponding to a processing step), and a cutting step S130 (corresponding to a processing step). The positions for performing the steps S50 to S130 are arranged in this order from the upstream side to the downstream side in the transport direction.

  FIG. 7A is a schematic plan view of the intermediate product 1m immediately before being conveyed to the ventilation hole forming step S50, and FIG. 7B is a schematic plan view of the intermediate product 1m immediately after passing through the ventilation hole forming step S50.

  7A and 7B, in the vent hole forming step S50, the above-described vent holes h, h are formed in the intermediate product 1m serving as the base material of both the abdominal band member 31 and the back band member 41. ... (corresponding to through holes) are formed. Here, in this production line, the intermediate product 1m is transported in a so-called lateral flow transport mode. That is, the intermediate product 1m is transported in a posture in which the horizontal direction of the diaper 1 is in the transport direction and the vertical direction is in the CD direction. Therefore, as shown in FIG. 7A, the form of the intermediate product 1m at the time when the intermediate product is sent from the upper process to the vent hole forming process S50 generally has a plurality of abdominal band members 31, 31. The continuous body 31a of the member and the continuous body 41a of the back side band member in which the plurality of back side band members 41, 41... Are continuous in the lateral direction become one sheet-like member 30mf integrally connected in the CD direction. I have.

  More precisely, the sheet-shaped member 30mf has a size in the CD direction corresponding to the sum of the vertical dimension of the nonwoven fabric 32 of the abdominal band member 31 and the vertical dimension of the nonwoven fabric 42 of the backband member 41. To the added value of the continuous nonwoven fabric 30mf1 (corresponding to the first nonwoven fabric) which is continuous in the transport direction while having the longitudinal dimension of the nonwoven fabric 33 of the ventral band member 31 and the longitudinal dimension of the nonwoven fabric 43 of the back side band member 41. And a continuous nonwoven fabric 30mf2 (corresponding to the second nonwoven fabric) having a size in the CD direction and continuous in the transport direction. These continuous nonwoven fabrics 30mf1 and 30mf2 are joined with a hot-melt adhesive in a state of two sheets laminated in the thickness direction. Further, between the continuous nonwoven fabrics 30mf1 and 30mf2, a plurality of thread rubber continuum bodies 35a and 45a to be the plurality of thread rubbers 35 and 45 described above are continuously extended in the transport direction along the transport direction. Then, the continuous nonwoven fabrics 30mf1 and 30mf2 are fixed to the continuous nonwoven fabrics 30mf2 and 30mf2, respectively. Further, one continuous nonwoven fabric 30mf2 of the two continuous nonwoven fabrics 30mf1 and 30mf2 has a larger size in the CD direction than the other continuous nonwoven fabric 30mf1, whereby the former continuous nonwoven fabric 30mf2 is It has portions 30mf2p1 and 30mf2p2 that protrude from the other continuous nonwoven fabric 30mf1 on both sides in the CD direction. Each of the protruding portions 30mf2p1 and 30mf2p2 is folded inward in the CD direction, thereby forming portions corresponding to the above-mentioned folded portions 33B and 43B.

  In this vent hole forming step S50, the intermediate product 1m of FIG. 7A, which is such a sheet-like member 30mf (corresponding to a composite sheet), is provided with a ventral band in one region in the CD direction as shown in FIG. 7B. A pair of air hole groups Gh31, Gh31 of the member 31 are formed repeatedly at the product pitch P1 in the transport direction, and a pair of air hole groups Gh41, Gh41 of the back band member 41 are respectively formed in the other side area in the transport direction. It is formed repeatedly at the product pitch P1. Note that the product pitch P1 here is substantially the same as the total length L31, L41 of the abdominal band member 31 and the back band member 41 in the expanded state in FIG.

  In the next CD-direction tension applying step S60, as shown in FIG. 6, tension is applied in the CD direction to the sheet-like member 30mf in which the ventilation holes h have been formed as the intermediate product 1m. This tension loosens the fiber at the edge he of the air hole h, thereby forming the air hole h remaining in the sheet-like member 30mf such as excessive uneven distribution of the fiber at the edge he of the air hole h. The sheet-like member 30mf is sent to various processes S70 to S130 such as the slitting process S70 in a proper state in which the influence of the above is reduced. As a result, the accuracy of the processing performed in each of the steps S70 to S130 can be improved. The CD-direction tension is applied to the sheet-like member 30mf by the CD-direction tension applying device 60, which will be described later.

  In the next slitting step S70, as shown in FIG. 6, the sheet-like member 30mf is divided into two parts in the CD direction, whereby the thread rubber continuum 35a is an uncut abdominal band member continuum 31a. And the continuum 45a of the thread rubber generates the continuum 41a of the back-side band member in an uncut state.

  In the next interval forming step S75, the continuum 31a of the abdominal band member and the continuum 41a of the back band member as the intermediate product 1m are respectively moved outward in the CD direction. Thereby, between the continuous bodies 31a and 41a in the CD direction, a size corresponding to the vertical distance Ld between the abdominal band member 31 and the back band member 41 in the developed diaper 1 in FIG. To form an interval.

  In the following abdominal thread rubber cutting step S80, when the continuum 31a of the abdominal band member passes, the continuum 35a of thread rubber is cut in the area AL1 corresponding to the non-stretchable area AL in the continuum 31a. Thereby, the non-stretchable area AL is formed in the continuous body 31a of the abdominal band member. The details are as follows.

First, in the continuum 31a of the abdominal band member, as shown in the schematic plan view of FIG. 8A, one region in the CD direction corresponds to the upper region AU in the above-described abdominal band member 31, and the other region on the other side. The region also corresponds to the lower region AD. At this point, a continuous body of thread rubber 35a is disposed in both areas in a state of extending in the transport direction along the transport direction. However, in one area of the former corresponding to the upper area AU, a continuous body 35a of thread rubber is fixed with a hot melt adhesive over the entire length in the transport direction, but the latter corresponding to the lower area AD. In the other area, a fixed area AH1 where the thread rubber continuum 35a is fixed and a non-fixed area AL1 where the continuous thread rubber 35a is not fixed are present in the transport direction. The non-fixed area AL1 exists at the product pitch P1 in the transport direction and the size of the non-stretchable area AL in the transport direction.
Therefore, as shown in the right part of FIG. 8B, when the thread rubber continuum 35a is cut at the predetermined position PC in the non-fixed area AL1, the downstream end 35aed of the thread rubber continuum 35a becomes the same continuum 35a. Disconnected from Then, the upstream portion 35eu of the cut rubber thread 35 contracts toward the fixed area AH1 located on the downstream side. Further, the portion 35aedn, which is a new downstream end portion of the thread rubber continuum 35a based on the above-described cutting, contracts toward the fixed region AH1 located on the upstream side. As a result, as shown in the left part of FIG. 8B, the non-fixed area AL1 is in a state where the thread rubber 35 does not exist, and as a result, the non-fixed area AL1 becomes the above-described non-stretchable area AL. On the other hand, as shown in FIG. 8B, in the fixing area AH1, the cut thread rubber 35 and the new downstream end portion 35aedn are formed on the basis of the fixing with the hot melt adhesive. Since each stays, the fixed area AH1 is given elasticity by the thread rubber 35. Thus, the fixed area AH1 becomes the above-described elastic area AH.

  In the following back side rubber thread cutting step S90, when the continuum 41a of the back side band member shown in FIG. 6 passes, in the area AL1 corresponding to the non-stretchable area AL in the continuity body 41a, the continuum 45a Is cut, thereby forming the non-stretchable area AL in the continuous body 41a of the back-side band member. The process of forming the non-stretchable region AL by this cutting is substantially the same as the above-described cutting process performed on the continuum 31a of the abdominal band member. Therefore, the description is omitted.

  In the next absorbent main body attaching step S100, a single sheet generated in a separate step (not shown) is attached to the continuous bodies 31a and 41a of the band members sent as the intermediate product 1m from the thread rubber cutting steps S80 and S90. The intermediate product 1m is fixed to the diaper 1H. The diaper 1H, 1H... Form.

  In the next two-folding step S110, the continuous body 1Ha of the substantially ladder-shaped diaper, which is 1 m of the intermediate product, is folded so that the continuous body 31a of the abdominal band member and the continuous body 41a of the back side band member are vertically overlapped in the thickness direction. Fold it.

  In the next side sealing step S120, the continuum 31a of the abdominal band member and the continuum 41a of the back band member, which are vertically stacked in the two-folding step S110, correspond to the lateral ends 31e, 41e of the diaper 1. It is welded at the position to form the side seal portion SS, thereby fixing it in a folded state. As a result, the intermediate product 1m is in the form of a continuous body 1a of pants-type diapers in which a plurality of pants-type diapers 1, 1 ... are connected in the lateral direction.

  Then, in the last cutting step S130, the continuous body 1a of the pants-type diaper as the intermediate product 1m is cut at each of the side seal portions SS, whereby the pants-type diaper 1 is manufactured.

  Hereinafter, each of the steps S50 to S100 will be described in more detail. Here, it is clear that the steps S110 to S130 after the two-folding step S110 can be appropriately realized by a well-known method. do not do.

<<< Ventilation hole forming step S50 >>>
In the ventilation hole forming step S50, a ventilation hole forming device 50 (corresponding to a through hole forming device) for forming a ventilation hole h in the sheet-like member 30mf is arranged. FIG. 9 is a schematic side view of the device 50 showing a part of the configuration (the upstream roll 51 and the downstream roll 58) in a longitudinal sectional view, and FIG. 10 is a schematic view taken along the line XX in FIG. It is an enlarged view.
As shown in FIG. 9, the air hole forming device 50 has three rolls 51, 55, and 58 that are driven and rotated around a rotation axis along the CD direction. That is, the rolls 51, 55, 58 are arranged side by side in the order of the upstream roll 51, the intermediate roll 55, and the downstream roll 58 from the upstream side to the downstream side in the transport direction. The intermediate roll 55 is disposed close to each of the rolls 51 and 58 such that both the upstream roll 51 and the downstream roll 58 face their outer peripheral surfaces. The sheet-like member 30mf sent as the intermediate product 1m to the air hole forming device 50 is conveyed along a substantially Ω-shaped conveyance route based on the rotation of these three rolls 51, 55, 58. . That is, first, the sheet-shaped member 30mf is conveyed along the arc-shaped first conveyance route R51 wound around the upstream roll 51, and then the second arc-shaped second roll wound around the intermediate roll 55. The sheet is conveyed along the conveyance route R55, and finally, is conveyed along a third arcuate conveyance route R58 wound around the downstream roll 58. Then, after that, the sheet-shaped member 30mf is separated from the downstream-side roll 58 and sent out to the CD-direction tension applying step S60 of the next step.
Note that the upstream roll 51 and the intermediate roll 55 are closest to each other at a predetermined position P51 in the rotation direction Dc51 of the upstream roll 51, and this closest position P51 is different from the first transport route R51 to the second transport route. This is the position where it switches to R55. Similarly, the intermediate roll 55 and the downstream roll 58 are closest to each other at a predetermined position P55 in the rotation direction Dc55 of the intermediate roll 55, and this closest position P55 is different from the second transport route R55 to the third transport route. This is the position where it switches to R58.

  The intermediate roll 55 has a plurality of pin members 55p, 55p,. Each of the pin members 55p, 55p,. That is, as shown in FIG. 10, in this example, the pin member 55p has a conical portion 55pa on the distal end side, and integrally has a cylindrical portion 55pb having the same diameter as the bottom surface of the conical portion 55pa on the root side. . Also, the outer peripheral surface of the upstream roll 51 has holes 51h, 51h... Into which the pin members 55p, 55p. That is, the hole 51h has a diameter larger than the diameter of the conical portion 55pa of the pin member 55p in a range where the pin member 55p is inserted. Each of the holes 51h is formed corresponding to each of the pin members 55p such that only one pin member 55p is inserted into one of the holes 51h at the above-described closest position P51.

Therefore, when the formation target portion where the ventilation hole h is to be formed in the sheet-like member 30mf located on the upstream roll 51 in FIG. 9 passes through the closest approach position P51, as shown in FIG. By inserting the corresponding pin member 55p into each hole 51h of the roll 51, the pin member 55p is smoothly pushed into the above-mentioned formation target portion of the sheet-like member 30mf, and thereby, the The ventilation hole h is formed quickly.
Incidentally, in this example, since the ventilation hole h is formed at the closest position P51 as described above, the closest position P51 is hereinafter referred to as the ventilation hole formation processing position P51 (corresponding to the through hole formation processing position). Also say.

  As shown in the enlarged view of the main part in FIG. 10, when the ventilation holes h are formed, the two continuous nonwoven fabrics 30mf1 and 30mf2 constituting the sheet-like member 30mf are moved in the thickness direction by the pin member 55p. Stuffed into Then, the fibers of the continuous nonwoven fabric 30mf1 and the constituent fibers of the continuous nonwoven fabric 30mf2 that have been pushed away by the pin member 55p are densely present together at the edge he of the ventilation hole h. Is an unevenly distributed portion having more constituent fibers than other portions, and a high entanglement strength portion in which the constituent fibers are strongly entangled. If the uneven distribution or the confounding strength is excessive, the touch feeling at the edge he of the ventilation hole h is deteriorated, and another processing is performed on the sheet-like member 3mf after the formation of the ventilation hole h. In this case, since the sheet-like member 30mf is processed in an inappropriate state in which the influence of the above-described processing of forming the air holes h is excessively left, the processing accuracy may be deteriorated. Therefore, in this manufacturing method and manufacturing apparatus, the above-described CD direction tension applying step S60 is provided. That is, in the step S60, the fibers at the edges he of the air holes h formed in the sheet member 30mf are loosened, and then the sheet member 30mf is sent to each of the processing steps S70 to S130. The details of the CD-direction tension applying step S60 will be described later.

  Incidentally, the apex angle of the conical portion 55pa in FIG. 10 is selected, for example, from a range of 20 ° to 45 °, and is 36 ° in this example. The height of the conical portion 55pa is selected, for example, from a range of 3 mm to 8 mm, and is 4.6 mm in this example. However, it is not limited to this. Furthermore, in this example, the edge of the hole 51h is chamfered, but the edge is not limited to this, that is, it may not be chamfered.

  Also, in this example, the intermediate roll 55 of FIG. 9 forms two ventilation groups Gh31, Gh31, Gh31, Gh31, Gh41, Gh41, Gh41, Gh41, Gh41 for one diaper per rotation as shown in FIG. 7B. , Is a large-diameter roll having a length corresponding to approximately twice the product pitch P1 described above. On the other hand, the upstream side roll 51 in FIG. 9 has a length whose circumferential length substantially corresponds to the product pitch P1 so that the air hole groups Gh31, Gh31, Gh41, Gh41 for one diaper in FIG. 7B can be formed per rotation. It is a small diameter roll. However, it is not limited to this.

  FIG. 11 is an explanatory diagram of an arrangement pattern of the pin members 55p on the outer peripheral surface of the intermediate roll 55, and FIG. 12 is an explanatory diagram of an arrangement pattern of the holes 51h on the outer peripheral surface of the upstream roll 51. In each of the drawings, the outer peripheral surface of each of the rolls 55 and 51 is shown developed on a plane. In FIG. 11, a receiving portion 55r, which will be described later, is not illustrated in order to prevent the drawing from being complicated.

  As shown in FIG. 11, the pin members 55p are provided corresponding to the air hole groups Gh31 and Gh41 formed in the sheet-like member 30mf. That is, as shown in FIG. 7B, a pair of ventilation holes Gh31, Gh31 for the abdominal band member 31 for each diaper should be formed in one area in the CD direction of the sheet member 30mf. Therefore, as shown in FIG. 11, in an area on one side in the CD direction on the outer peripheral surface of the intermediate roll 55, pin member groups G55p1 and G55p1 having a plurality of pin members 55p in the same staggered arrangement as the ventilation hole group Gh31 are provided. , In the rotation direction Dc55. Similarly, in the region on the other side in the CD direction of the sheet-shaped member 30mf, a pair of ventilation holes Gh41 and Gh41 for the back band member 41 should be formed for each diaper. In a region on the other side in the CD direction on the outer peripheral surface, a pair of pin members G55p2 and G55p2 having a plurality of pin members 55p in the same staggered arrangement as the ventilation hole group Gh41 are provided side by side in the rotation direction Dc55.

  In this example, as described above, since the intermediate roll 55 forms the ventilation holes h for two diapers in one rotation, the pair of pin members G55p1, G55p1 (G55p2, G55p2) arranged in the rotation direction Dc55. ) Is a set of pin member group sets SG55p1 (SG55p2), and two sets of pin member group sets SG55p1 and SG55p1 (SG55p2) are formed on the outer peripheral surface of the intermediate roll 55 at an equal pitch of 180 ° in the rotation direction Dc55. SG55p2) are provided side by side.

  Further, FIG. 13A shows an enlarged view of a portion XIIIa in FIG. 11, and FIG. 13B shows a view taken in the direction of arrows BB in FIG. 13A. Here, as shown in FIG. A receiving portion 55r separate from the pin member 55p is formed at a position between the adjacent pin members 55p on the outer peripheral surface of the intermediate roll 55. Then, as shown in FIG. 13B, the receiving portion 55r is a substantially cylindrical body having a top surface 55rt facing outward in the rotational radial direction Dr55 of the intermediate roll 55 at the tip. Therefore, the sheet-shaped member 30mf is received and held by the receiving portion 55r in addition to the pin member 55p. Therefore, the sheet-like member 30mf can be stably held as a whole at an appropriate position in the rotational radius direction Dr55 of the intermediate roll 55. At this time, the receiving portion 55r receives the top surface 55rt without penetrating one surface of the sheet member 30mf, but this also stably holds the sheet member 30mf at the appropriate position. Effectively contributes to

  Further, in this example, as shown in FIG. 13A, the receiving portions 55r are provided at four places around the pin member 55p, thereby enabling the sheet-shaped member 30mf to be reliably received. It is not limited to the above four places. For example, when the arrangement space cannot be secured, the number may be smaller than this, or conversely, when the arrangement space can be secured, the number may be larger.

  Further, in the example of FIG. 13B, the position of the top surface 55rt of the receiving portion 55r is located inside the rotational radius direction Dr55 of the intermediate roll 55 from the position of the vertex of the pin member 55p. This prevents the receiving portion 55r from interfering with the process of forming the ventilation hole h by the pin member 55p. Note that, desirably, the top surface 55rt of the receiving portion 55r is preferably located near the bottom surface of the conical portion 55pa of the pin member 55p. For example, the top surface 55rt is positioned with respect to the position in the rotational radius direction Dr55. It is preferable that the distance falls within a range of ± 2 mm around the position of the bottom surface. And in this example, the top surface 55rt coincides with the bottom surface of the conical portion 55pa. Therefore, the receiving portion 55r can reliably receive the sheet-shaped member 30mf without substantially obstructing the process of forming the through-hole of the ventilation hole h of the pin member 55p. Thus, the pin member 55p can quickly form the ventilation hole h in the sheet-like member 30mf.

  Further, in this example, the top surface 55rt of the receiving portion 55r is formed in a perfect circular shape, and the diameter thereof is selected from a range of, for example, 2 mm to 5 mm, but is not limited to this. For example, it may be a polygon such as an equilateral triangle or a square, or a shape other than these.

  On the other hand, as shown in FIG. 12, a hole 51h on the outer peripheral surface of the upstream roll 51 is provided corresponding to the pin member 55p. That is, as shown in FIG. 11, a pair of pin member groups G55p1 and G55p1 are provided in a region on one side in the CD direction on the outer peripheral surface of the intermediate roll 55 so as to be arranged in the rotation direction Dc55. In a region on one side in the CD direction on the outer peripheral surface of the upstream roll 51, a pair of hole groups G51h1 and G51h1 having a plurality of holes 51h in a staggered arrangement are provided side by side in the rotation direction Dc51. I have. Similarly, as shown in FIG. 11, a pair of pin member groups G55p2 and G55p2 are provided in a region on the other side in the CD direction on the outer peripheral surface of the intermediate roll 55 in the rotation direction Dc55. Correspondingly, in the region on the other side in the CD direction on the outer peripheral surface of the upstream roll 51, a pair of hole groups G51h2 and G51h2 having a plurality of holes 51h in a staggered arrangement are provided side by side in the rotation direction Dc51. ing.

  However, as described above, since the upstream roll 51 participates in the formation of the ventilation holes h for one diaper in one rotation, the pair of hole groups G51h1, G51h1 (G51h2, G51h2) arranged in the rotation direction Dc51. Is a single hole group set SG51h1 (SG51h2), only one such hole group set SG51h1 (SG51h2) is provided on the outer peripheral surface of the upstream roll 51.

  In some cases, a heating device (not shown) such as an electric heater may be incorporated in the intermediate roll 55 in FIG. 9 to heat the pin member 55p of the intermediate roll 55. Then, in this manner, based on the heated pin member 55p, the thermoplastic resin fibers, which are constituent fibers of the continuous nonwoven fabrics 30mf1 and 30mf2 of the sheet-like member 30mf, can be softened. Therefore, when the pin member 55p is pushed into the sheet-like member 30mf, the fibers are easily pushed away to the surroundings, thereby easily forming the ventilation holes h.

  Incidentally, as a guide for heating, for example, the temperature of the pin member 55p is set to be equal to or higher than the softening point of the thermoplastic resin and lower than the melting point. The softening point can be determined by TMA (thermomechanical analysis) according to JIS K7196 (softening temperature test method for thermoplastic films and sheets by thermomechanical analysis). The melting point can be determined as a melting peak temperature in DSC (differential scanning calorimetry) according to JIS K7121 (method for measuring transition temperature of plastic).

  On the other hand, the configuration of the downstream roll 58 in FIG. 9 is substantially the same as that of the upstream roll 51. For example, hole groups G58h1 and G58h2 having the same specifications as the hole groups G51h1 and G51h2 on the outer surface of the upstream roll 51 are provided on the outer peripheral surface of the downstream roll 58. Thus, when the sheet-shaped member 30mf is received from the intermediate roll 55, the pin member 55p of the intermediate roll 55 is smoothly inserted into each of the hole portions 58h of the hole group G58h1 and G58h2. The sheet-like member 30mf can be received without greatly changing the shape of the ventilation hole h formed in the sheet-like member 30mf.

<<<< CD direction tension applying step S60 >>>>
As shown in FIG. 6, in the CD-direction tension applying step S60, tension is applied to both sides in the CD direction of the sheet-like member 30mf in which the ventilation holes h sent from the ventilation hole forming step S50 in the upper step have been formed. And thereby, the fiber of the edge part he of the ventilation hole h of 30 mf of sheet-like members is loosened.

The application of the tension in the CD direction is performed by the CD-direction tension applying device 60. FIG. 14A is a schematic plan view showing the CD direction tension applying device 60 in an enlarged manner, and FIG. 14B is a view taken in the direction of arrows BB in FIG. 14A.
As shown in FIG. 14A, the CD-direction tension applying device 60 has position adjusting mechanisms 60A, 60A on both sides in the CD direction. Then, each of the position adjusting mechanisms 60A, 60A adjusts the position of the corresponding end 30mfe, 30mfe in the CD direction on the sheet-shaped member 30mf, respectively.

  The position adjusting mechanisms 60A and 60A have a mirror image relationship with each other with respect to a center line CL in the CD direction, and have basically the same basic structure. Therefore, only one position adjusting mechanism 60A will be described below.

  As shown in FIGS. 14A and 14B, the position adjusting mechanism 60 </ b> A is driven, for example, with its outer peripheral surfaces facing each other so as to sandwich the CD-direction end 30 mfe of the sheet-like member 30 mf from both sides in the thickness direction. A pair of rotating upper and lower nip rollers 60Ru, 60Rd, an actuator 60d for rotating the pair of upper and lower nip rollers 60Ru, 60Rd around a support shaft C60A in a plane having both the conveying direction and the CD direction, and the nip roller. A sensor 60s, such as a photoelectric tube, which is disposed immediately downstream of 60Ru, 60Rd and measures the position of the end 30mfe in the CD direction and outputs a measurement signal, and controls the actuator 60d based on the measurement signal from the sensor 60s. And a controller (not shown).

  If the measurement signal indicates that the end 30mfe is located on one side in the CD direction from the target position, the controller determines the deviation between the actual position indicated by the measurement signal and the target position. Is controlled by a control amount obtained by multiplying a predetermined gain by a predetermined gain, whereby the feed direction Dr60 of the pair of upper and lower nip rollers 60Ru, 60Rd is set to be greater than the current feed direction Dr60 by an amount corresponding to the control amount. Face the other side in the CD direction. On the other hand, if the measurement signal indicates that the end portion 30mfe is located on the other side in the CD direction from the target position, the controller similarly determines the actual position indicated by the measurement signal and the target position. The actuator 60d is controlled by a control amount obtained by multiplying the deviation from the above by a predetermined gain, whereby the sending direction Dr60 of the pair of upper and lower nip rollers 60Ru, 60Rd is more corresponded to the above controlling amount than the current sending direction Dr60. To the one side in the CD direction. By repeating this at a predetermined control cycle, the end portion 30mfe of the sheet member 30mf comes to be located at the target position in the CD direction.

  The target position is set in advance at a position where a tension in the CD direction is applied to the sheet-shaped member 30mf. That is, in this example, the sheet-shaped member 30mf has a continuous body of thread rubber 35a, 35a ... (45a, 45a ...) along the conveyance direction, and the sheet-shaped member 30mf includes Tension is applied along the transport direction. Therefore, the sheet-shaped member 30mf contracts in the CD direction due to the transport tension. That is, the dimension in the CD direction is reduced with the conveyance. Then, in this example, the target position is set at a position outside in the CD direction from the position of each end 30mfe of the sheet-shaped member 30mf in the reduced state. Therefore, by adjusting each end 30mfe to be located at the target position, tension in the CD direction is applied to the sheet-like member 30mf.

  Further, in this example, as described above, the pair of upper and lower nip rollers 60Ru and 60Rd perform the above-described turning operation while sandwiching the end 30mfe in the CD direction of the sheet-like member 30mf from both sides in the thickness direction. A tension in the CD direction is applied to the shaped member 30mf. Therefore, the “tension applying position” according to the claims, ie, “the position at which the tension in the CD direction is applied to the sheet-shaped member 30mf” is a nip position P60 at which the pair of upper and lower nip rollers 60Ru, 60Rd sandwich the sheet-shaped member 30mf. It is almost the same position. Therefore, hereinafter, this nip position P60 is also referred to as “tension applying position P60”.

  Here, it is desirable that the size relationship in the CD direction of the sheet-like member 30mf be set as follows by adjusting the target position. That is, the dimension L30mfk (FIG. 14A) of the sheet-like member 30mf in the CD direction at the tension applying position P60 in the CD direction tension applying step S60 is the same as that in the above-described vent hole forming processing position P51 in the vent hole forming step S50. It is preferable that the dimension of the sheet-like member 30mf in the CD direction be L30mfh or more. In this way, the size of the sheet-like member 30mf that can be reduced in the CD direction while being conveyed from the ventilation hole formation processing position P51 to the tension applying position P61 is set at least when the ventilation hole h is formed. Can be enlarged to a dimension L30mfh in the CD direction. Thus, in the CD-direction tension applying step S60, the tension in the CD direction can be reliably applied to the sheet-like member 30mf, and as a result, the fibers at the edges he of the ventilation holes h of the sheet-like member 30mf can be reliably removed. Can be loosened.

  Further, the adjustment of the target position may be performed with the following as a guide. That is, the above-described target position is set such that the dimension in the CD direction of the ventilation hole h at the tension applying position P60 is larger than the maximum dimension L55pa in the CD direction of the conical portion 55pa of the pin member 55p in FIG. You may. Also in this case, at least the ventilation hole h is formed in the CD-direction dimension of the sheet-like member 30mf that can be reduced while being conveyed from the ventilation hole forming step S50 to the CD-direction tension applying step S60. In this case, the dimension in the CD direction can be increased to L30 mfh. Therefore, in the CD-direction tension applying step S60, the tension in the CD direction can be reliably applied to the sheet-like member 30mf, and as a result, the fibers at the edge he of the ventilation hole h of the sheet-like member 30mf can be reliably loosened. Can be.

  On the other hand, in this example, as shown in FIG. 6, the tension application position P60 in the CD-direction tension application process S60 corresponds to the ventilation hole in the ventilation hole formation process S50 among the aforementioned processes S70 to S130 corresponding to the processing process. It is provided between the position of the slit step S70, which is the processing step S70 closest to the formation processing position P51, and the ventilation hole formation processing position P51. Thus, a tension in the CD direction is applied to the sheet member 30mf in which the ventilation holes h have been formed at a position immediately downstream of the ventilation hole forming processing position P51. Accordingly, the state of the sheet-like member 30mf is changed from the most upstream processing step S70 among the processing steps S70 to S130 located downstream of the ventilation hole formation processing position P51, so that the fiber at the edge he of the ventilation hole h is changed. It can be in a loosened proper state. Therefore, the sheet-like member 30mf can be processed with high processing accuracy in all the processing steps S75 to S130 located downstream from the slitting step S70, which is the uppermost processing step S70.

When the intermediate roll 55 (corresponding to the first rotating body) described above with reference to FIG. 9 is a heating roll heated by the above-described heating device, the intermediate roll 55 causes the sheet-like member 30mf Is also heated, in which case it is desirable that: That is, the application of the tension in the CD direction to the sheet-like member 30mf performed in the CD-direction tension applying step S60 is such that the temperature of the sheet-like member 30mf is higher than the temperature before being heated by the intermediate roll 55. Good to be done at times.
And if it becomes like this, the fiber of the edge part he of the ventilation hole h of the sheet-like member 30mf can be loosened in the softened state, and thereby the fiber can be easily loosened. Note that, instead of or in addition to the intermediate roll 55, the upstream roll 51 (corresponding to the second rotating body) or the downstream roll 58 in FIG. 9 is heated by a heating device (not shown) such as an electric heater. A heated roll may be used. And even in such a case, the sheet-like member 30mf can be heated by the rolls 51 and 58, whereby the same operation and effect as described above can be obtained.

<<<< Slit process S70 >>>>
As shown in FIG. 6, in the slitting step S70, the sheet-like member 30mf sent from the CD tension applying step S60 in the upper step is moved to the boundary position BL (FIG. 7B) between one side area and the other side area in the CD direction. ). Thereby, the continuum 31a of the abdominal band member in which the thread rubber continuum 35a is in the uncut state and the continuum 41a of the dorsal band member in which the thread rubber continuum 45a is in the uncut state are arranged in the CD direction. (Fig. 6).

  Such a two-part process can be performed using the well-known slitter device 70 of FIG. That is, the device 70 has, for example, a pair of upper and lower disc-shaped rotary blades, and divides the sheet-like member 30mf into two in the CD direction with the cutting edge of the outer peripheral edge of the rotary blade. 70 is well known. Therefore, further description is omitted.

<<< Spacing forming step S75 >>>
As shown in FIG. 6, in the interval forming step S75, the continuous body 31a of the abdominal band member and the continuous body 41a of the back side band member sent from the upper slitting step S70 are respectively moved outward in the CD direction. Accordingly, a size corresponding to the vertical distance Ld between the abdominal band member 31 and the back band member 41 in the developed diaper 1 in FIG. 2 is provided between the continuous bodies 31a and 41a in the CD direction. To form an interval.

  It should be noted that the outward movement of the continuum 31a of the abdominal band member in the CD direction and the outward movement of the continuum 41a of the dorsal band member in the CD direction are each performed along a transport path in consideration of the above movement. Can be realized by arranging the transfer rollers (not shown), and the contents thereof can be inferred from the above description. Therefore, further description is omitted.

<<<< Abdominal thread rubber cutting step S80 >>>>
In the abdominal thread rubber cutting step S80, as shown in FIG. 8B, the unfixed portion corresponding to the non-stretchable area AL is attached to the continuum 31a of the abdominal band member of FIG. 8A sent from the interval forming step S75 of the upper process. In the area AL1, the thread rubber continuum 35a is cut, while in the fixed area AH1 corresponding to the elastic area AH, the thread rubber continuum 35a is not cut. Thereby, the non-stretchable area AL and the stretchable area AH are formed in the continuum 31a of the abdominal band member. The area AL1 corresponding to the non-stretchable area AL appears at the product pitch P1 of the diaper 1 in the transport direction. Therefore, such cutting processing is performed on the continuum 31a of the abdominal band member at the product pitch P1 of the diaper 1.

  This cutting process is performed by the abdominal cutter device 80. FIG. 15A is a schematic side view of the cutter device 80, and FIG. 15B is a view taken along the line BB in FIG. 15A.

The abdomen-side cutter device 80 has a pair of upper and lower rolls 81u and 81d that are driven and rotated around a rotation axis along the CD direction while their outer peripheral surfaces 81ua and 81da are opposed to each other. The cutter block 84 on the outer peripheral surface 81ua of the upper roll 81u is formed with a plurality of cutter blades C, C,... Corresponding to the predetermined positions PC, PC,. 81da is a smooth surface for receiving the cutter blades C, C. The rolls 81u and 81d are controlled to rotate in conjunction with the conveyance operation of the continuum 31a of the abdominal band member, so that the above-described non-fixed area AL1 corresponding to the non-stretchable area AL passes. Each time the cutter roll 81u rotates, the cutter block 84 faces the non-fixed area AL1. Then, each time the non-fixed area AL1 corresponding to the non-stretchable area AL in FIG. 8A passes between the outer peripheral surfaces 81ua and 81da of the pair of rolls 81u and 81d, the non-fixed area AL1 is Are pressed by the cutter blades C of the cutter block 84 of the cutter roll 81u and the outer peripheral surface 81da of the anvil roll 81d. .. Are cut off at the pressed positions PC.
<<<< Back side thread rubber cutting step S90 >>>>
As shown in FIG. 6, in the back side rubber thread cutting step S90, the continuous body 41a of the back side band member sent from the interval forming step S75 in the upper step has been described with reference to FIGS. 8A and 8B. The same cutting processing as described above is performed. That is, in the area AL1 corresponding to the non-stretchable area AL, the thread rubber continuum 45a is cut, and in the area AH1 corresponding to the stretchable area AH, the thread rubber continuum 45a is not cut. Thereby, the non-stretchable area AL and the stretchable area AH are formed in the continuous body 41a of the back-side band member. As can be understood from the above description, such a cutting process is substantially the same as the above-described belly-side thread rubber cutting step S80, and the configuration of the back-side cutter device 90 in FIG. It is the same as that of the cutter device 80. Therefore, a detailed description thereof is omitted here.

<<< Absorptive main body mounting step S100 >>>
In the absorbent main body attaching step S100, as shown in FIG. 6, a continuous body 31a, 41a of each band member sent as an intermediate product 1m from each of the thread rubber cutting steps S80, S90 in the upper step is attached to another unillustrated part. The cut-sheet-shaped absorbent main body 10 generated in the process is stretched over and fixed, whereby the intermediate product 1m is formed into a substantially ladder in which the diapers 1H, 1H... Diaper 1Ha.

In addition, about the realization of the mounting process of the absorbent main body 10, for example, a rotating drum (not shown) having a plurality of holding portions on the outer peripheral surface for sucking and holding the absorbent main body 10 at the product pitch P1 in the rotating direction. And such rotating drums are well known. Therefore, detailed description is omitted.

=== Second Embodiment ===
FIG. 16 is a schematic explanatory view of the manufacturing method of the second embodiment.
In the above-described first embodiment, as shown in FIG. 6, the tension application position P60 of the CD-direction tension application process S60 is located between the vent hole forming process S50 and the slit process S70 in the transport direction. In the second embodiment, as shown in FIG. 16, the tension application position P60 in the CD-direction tension application process S60 is located on the downstream side of the slit process S70. At a position downstream of the slit step S70, the sheet-shaped member 30mf is divided into a continuum 31a of the abdominal band member and a continuum 41a of the back-side band member. , 41a mainly in that CD direction tension applying steps S60, S60 are provided, respectively. The other points are substantially the same as those in the first embodiment. Therefore, the same components are denoted by the same reference numerals, and description thereof will be omitted.

  As shown in FIG. 16, in the second embodiment, the tension application position P60 of the CD-direction tension application process S60 for the continuum 31a of the abdominal band member is set such that the abdominal thread rubber cutting process S80 and the absorbent body in the transport direction. On the other hand, the tension applying position P60 of the CD-direction tension applying step S60 for the continuum 41a of the back side band member is located between the back side thread member cutting step S90 and the absorbent main body in the transport direction. It is located between the mounting step S100. Then, CD-direction tension applying devices 60, 60 are provided at the tension applying positions P60, P60, respectively. That is, the CD-direction tension applying device 60 for the continuum 31a of the abdominal band member has the position adjusting mechanisms 60A, 60A on both sides in the CD direction in the same manner as described above, and the abdominal band is provided by the mechanisms 60A, 60A. A tension in the CD direction is applied to the continuum 31a of the member. Similarly, the CD-direction tension applying device 60 for the continuum 41a of the back-side band member also has position adjustment mechanisms 60A, 60A on both sides in the CD direction, and the continuation of the back-side band member is performed by the mechanisms 60A, 60A. A tension in the CD direction is applied to the body 41a. The configurations of the position adjusting mechanisms 60A, 60A,... Are the same as those described in the first embodiment. Therefore, detailed description is omitted.

In both the second embodiment of FIG. 16 and the first embodiment of FIG. 6, the abdominal band member is located at a position upstream of the tension application position P60 in the CD direction tension application step S60 in the transport direction. Also, there is no step of fixing another member such as the absorbent main body 10 to each of the continuous members 31a and 41a of the back side band member or the sheet-like member 30mf. That is, in the second and first embodiments, before the separate member is fixed, a tension in the CD direction is applied to each of the continuous bodies 31a, 41a or the sheet-like member 30mf in which the ventilation holes h have been formed. It has become.
Therefore, according to the second and first embodiments, a problem that occurs when the tension in the CD direction is applied after the fixing of the separate member, that is, the tension is received by the separate member, and the tension is applied to each member. Transmission to the continuum 31a, 41a or the sheet-like member 30mf becomes difficult, and it is possible to effectively prevent the action of loosening the fiber at the edge he of the ventilation hole h from being reduced.

  By the way, in some cases, the production line of the second embodiment shown in FIG. 16 includes not only the respective CD-direction tension applying steps S60 and S60 for the continuous body 31a of the abdominal band member and the continuous body 41a of the back band member, A CD-direction tension applying step S60 for the sheet member 30mf described in the first embodiment of FIG. 6 may be provided.

=== Third Embodiment ===
FIG. 17 is a schematic explanatory view of the manufacturing method according to the third embodiment.
In the above-described first embodiment, as shown in FIG. 6, the CD-direction tension applying step S60 is provided only on the downstream side in the transport direction from the ventilation hole forming position P51 in the ventilation hole forming step S50, and The third embodiment is different from the third embodiment mainly in that the same step S60 is provided not only on the downstream side but also on the upstream side as shown in FIG. The other points are substantially the same as those in the first embodiment. Therefore, the same components are denoted by the same reference numerals, and description thereof will be omitted.

  As shown in FIG. 17, in the third embodiment, a position almost upstream of the vent forming position P51 in the transport direction in the vent forming step S50 is substantially the same as that described in the first embodiment. The configured CD direction tension applying device 60 is arranged. That is, the device 60 has, on both sides in the CD direction, position adjustment mechanisms 60A, 60A having substantially the same configuration as those described above, and by using these position adjustment mechanisms 60A, 60A, a sheet in which the ventilation hole h is not formed is formed. A tension in the CD direction is applied to the shaped member 30mf. Thus, at the air hole forming processing position P51 in the air hole forming step S50, the air holes h are formed in the sheet-like member 30mf in a state where tension in the CD direction is applied.

  Here, when forming the air holes h in this way, by applying tension in the CD direction to the sheet-like member 30mf, the accuracy of forming the air holes h can be increased. The details are as follows.

First, as described above, the sheet-like member 30mf has continuous bodies 35a and 45a of thread rubber, and when the sheet-like member 30mf is transported in the transport direction, the tension for transport is used. A tension is applied to the sheet-like member 30mf in a direction along the transport direction. Therefore, the width of the sheet-like member 30mf can be reduced by the amount by which the sheet-like member 30mf is elongated in the transport direction by the transport tension. That is, it can shrink in the CD direction. Then, based on this shrinkage, the fibers of the sheet-like member 30mf as a whole are shifted from the end side in the CD direction to the center side, and as a result, the sheet-like member 30mf has a fiber distribution density (g / cm ³ ). Are biased in the CD direction. For example, the density at the center in the CD direction is higher than that at the ends. If the ventilation holes h are formed in the inappropriately shaped sheet member 30mf having such density, the formation processing of the ventilation holes h becomes unstable, and the precision of the formation of the ventilation holes h may be reduced. However, in this regard, according to the manufacturing method of the third embodiment, the ventilation holes h are formed in the sheet-like member 30mf in a state where the tension in the CD direction is applied to the sheet-like member 30mf. Therefore, at the time of forming the ventilation hole h, the sheet-like member 30mf has been changed from the inappropriate state in which the density of the fiber distribution is biased in the CD direction to the appropriate state in which the bias in the density has been reduced. The accuracy of forming the ventilation holes h can be increased.

=== Other Embodiments ===
As described above, the embodiments of the present invention have been described. However, the above embodiments are for facilitating the understanding of the present invention, and are not for limiting and interpreting the present invention. Further, the present invention can be changed or improved without departing from the gist thereof, and it goes without saying that the present invention includes equivalents thereof. For example, the following modifications are possible.

  In the above-described embodiment, the thread rubber continuum 35a, 45a is illustrated as an example of the continuous elastic member, but the invention is not limited to this. For example, a continuous body of a rubber band may be used.

  In the above-described embodiment, the pin member 55p of the intermediate roll 55 has the conical portion 55pa and the cylindrical portion 55pb as shown in the enlarged view of the main part in FIG. 10, but is not limited to this. For example, instead of the conical portion 55pa, a conical portion having a polygonal cross section such as a triangular pyramid or a quadrangular pyramid may be provided, and instead of the cylindrical portion 55pb, a columnar portion having a polygonal cross section such as a triangular prism or a quadrangular prism may be provided. May be.

  In the above-described embodiment, as shown in FIG. 9, the sheet-shaped member 30mf as the intermediate product 1m is wound around the upstream roll 51 and the intermediate roll 55 of the ventilation hole forming device 50 in the ventilation hole forming step S50, respectively. It is not limited to this. That is, the sheet-like member 30mf may be passed between the rolls 51 and 55 without being wound around either the upstream roll 51 or the intermediate roll 55.

In the above-described embodiment, the three-piece disposable diaper 1 is illustrated as an example of the absorbent article, but the present invention is not limited to this. For example, when manufacturing a sheet-shaped member that is a material of a two-piece disposable diaper, the method and apparatus for manufacturing a sheet-shaped member of the present invention may be applied. Incidentally, a two-piece type disposable diaper has, for example, an absorbent sheet 10 having an abdominal part, a crotch part and a back part as a first component, and fixed to the skin side of the outer sheet. As a second part. And in that case, when the continuous sheet of the above-mentioned exterior sheet is formed of a two-layer nonwoven fabric, and a hole is formed in the two-layer nonwoven fabric, or when the elastic member between the two-layer nonwoven fabric is cut, Thus, the method and apparatus for manufacturing a sheet-shaped member of the present invention will be used.
Furthermore, the two-piece diaper may be a so-called tape-type disposable diaper. In addition, the tape-type disposable diaper is a type that uses a fastening tape to connect the above-mentioned abdominal part that covers the wearer's torso from the abdomen and the above-mentioned dorsal part that covers the same torso from the dorsal side. It is a diaper.
In addition, the absorbent article is not limited to the disposable diaper 1 at all. That is, if the absorbent article is manufactured using a nonwoven fabric as a material, the method and apparatus for manufacturing a sheet-shaped member of the present invention can be applied during the manufacture. Therefore, the concept of the absorbent article includes a urine absorbing pad, a sanitary napkin, and the like.

  In the above-described embodiment, as an example of the CD-direction tension applying device 60 used in the CD-direction tension applying step S60 in FIGS. 6 and 16, the ends 30mfe and 30mfe of the sheet-like member 30mf are provided on both sides in the CD direction. Although the apparatus having two position adjusting mechanisms 60A, 60A for adjusting the position of the above is exemplified, the invention is not limited to this. For example, as the device 60, a minus crown (concave) roll having a roll crown, that is, a roll (not shown) having a diameter at the center in the CD direction smaller than the diameter at both ends in the CD direction may be used. . In this case, the roll is supported so as to be rotatable around a rotation axis along the CD direction, and the sheet-shaped member 30mf is wound around the outer peripheral surface of the roll. The sheet-like member 30mf is pulled to both sides in the CD direction based on a peripheral speed difference between the center portion and both end portions, whereby tension in the CD direction is applied to the sheet-like member 30mf. .

  In the above-described embodiment, the position of the vent hole forming step S50 is set upstream of the respective positions of the slitting step S70, the belly-side thread rubber cutting step S80, and the back-side thread rubber cutting step S90 in the transport direction. However, nothing is limited to this. For example, the position of the slit step S70, or the position of the vent hole forming step S50 may be set on the downstream side in the transport direction from the positions of the belly-side thread rubber cutting step S80 and the back-side thread rubber cutting step S90. .

1 disposable diapers (absorbent articles),
1a diaper continuum, 1Ha ladder-like diaper continuum,
1m intermediate product,
10 absorbent body,
10LG part, 10ea end, 10eb end,
11 absorber, 11c absorbent core,
13 top sheet, 15 back sheet,
15a leakproof sheet, 15b exterior sheet,
16 thread rubber,
30mf sheet member (composite sheet), 30mfe end,
30mf1 continuous nonwoven fabric (first nonwoven fabric), 30mf2 continuous nonwoven fabric (second nonwoven fabric),
30mf2p1 part, 30mf2p2 part,
31 abdominal band member, 31a continuum of abdominal band member,
31e end,
31s Absorptive body non-existent part,
32 non-woven fabric, 32Le end,
33 non-woven fabric, 33B folded part,
35 thread rubber (elastic member), 35eu part,
35a thread rubber continuum (elastic member), 35aed end, 35aedn part,
41 a back band member, 41a a continuum of the back band member
42 non-woven fabric, 42Le end,
43 non-woven fabric, 43B folded part,
45 thread rubber (elastic member),
45a thread rubber continuous body (elastic member),
50 vent forming device (through-hole forming device),
51 upstream roll (second rotating body), 51h hole,
55 intermediate roll (first rotating body),
55p pin member (pushing member), 55pa cone part, 55pb cylindrical part,
55r receiving part, 55rt top surface,
58 downstream roll, 58h hole,
60 CD direction tension applying device, 60A position adjusting mechanism,
60Ru nip roller, 60Rd nip roller,
60d actuator, 60s sensor,
70 Slitter device,
80 cutter device for ventral side,
81u cutter roll, 81ua outer peripheral surface,
81d anvil roll, 81da outer peripheral surface,
84 cutter blocks,
90 back side cutter device,
h Vent hole (through hole), he edge, C cutter blade, B burr,
AH stretch area, AH1 fixed area,
AL non-stretchable area, AL1 non-fixed area,
AU upper area, AD lower area, ADc central area, ADe end side area,
BH waist opening, LH leg opening, LG leg gather,
CL1 center position, CL10 predetermined position, CL center line, C60A support shaft,
SS side seal,
PC predetermined position, TC trace, BL boundary position,
Gh31 vent group, Rh31 vent row,
Gh41 vent group, Rh41 vent row,
G51h1 hole group, G51h2 hole group,
G55p1 pin member group, G55p2 pin member group,
G58h1 hole group, G58h2 hole group,
SG51h1 hole group set, SG51h2 hole group set,
SG55p1 pin member group set, SG55p2 pin member group set,
R51 first transport route, R55 second transport route, R58 third transport route,
P51 closest approach position (air hole formation processing position, through hole formation processing position), P55 closest approach position,
P60 pinching position (tension applying position),
S50 vent hole forming step (through hole forming step),
S60 CD direction tension applying step,
S70 slitting step (processing step),
S75 interval forming step (processing step),
S80 ventral thread rubber cutting step (processing step),
S90 Dorsal thread rubber cutting step (processing step),
S100 Absorbent main body attaching step (separate member fixing step, processing step),
S110 Folding step (processing step)
S120 side sealing step (processing step),
S130 cutting step (processing step),

Claims (8)

A method for manufacturing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet, while being extended in the predetermined direction. A plurality of elastic members along the predetermined direction, the composite sheet is inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, a conveying step of conveying the predetermined direction as the conveying direction,
A through-hole that penetrates the composite sheet in the thickness direction by pushing a pushing member in the thickness direction at a position between the elastic members adjacent to each other in the CD direction in the composite sheet; Forming step;
A CD-direction tension applying step of applying a tension in the CD direction to the composite sheet at a position on the downstream side in the transport direction from a through-hole forming processing position at which the through-hole is formed in the through-hole forming step;
A processing step of processing the composite sheet at a position downstream of the tension applying position for applying the tension in the CD direction tension applying step in the transport direction. A method for manufacturing a sheet-like member. It is a manufacturing method of the sheet-like member concerning the absorbent article according to claim 1,
On the downstream side in the transport direction from the through-hole formation processing position, has a plurality of the processing steps,
The tension applying position in the CD-direction tension applying step is located between the through-hole forming processing position and a processing step closest to the through-hole forming processing position among the plurality of processing steps. A method for manufacturing a sheet-like member according to an absorbent article. It is a manufacturing method of the sheet-like member concerning the absorbent article according to claim 1 or 2,
An absorbent article, characterized in that there is no separate member fixing step of fixing another member to the composite sheet at a position on the upstream side in the transport direction from the tension applying position in the CD direction tension applying step. A method for manufacturing a sheet-like member. It is a manufacturing method of the sheet-like member concerning the absorbent article according to any one of claims 1 to 3,
The first nonwoven fabric and the second nonwoven fabric both contain thermoplastic resin fibers,
In the through-hole forming step, the pushing member protrudingly formed on the outer peripheral surface of the first rotator rotating along the transport direction is provided on the outer peripheral surface of the second rotator rotating along the transport direction. When inserted into the hole, the pushing member is pushed into the composite sheet to form the through hole,
At least one of the first rotating body and the second rotating body is heated, and the composite sheet is heated by the rotating body,
In the CD-direction tension applying step, the tension in the CD direction is applied to the composite sheet in a state where the temperature is higher than the temperature of the composite sheet before being heated by the rotating body. The manufacturing method of the sheet-like member which concerns on. It is a manufacturing method of the sheet-like member concerning an absorptive article in any one of Claims 1-4,
The sheet-like member according to the absorbent article, wherein the dimension of the composite sheet in the CD direction at the tension applying position is equal to or larger than the dimension of the composite sheet in the CD direction at the through-hole forming processing position. Manufacturing method. It is a manufacturing method of the sheet-like member concerning the absorbent article according to any one of claims 1 to 5,
In the CD-direction tension applying step, the tension in the CD direction is applied such that the dimension in the CD direction of the through hole at the tension applying position is larger than the dimension in the CD direction of the pushing member. A method for producing a sheet-like member according to an absorbent article. It is a manufacturing method of the sheet-like member concerning the absorbent article according to any one of claims 1 to 6,
On the upstream side in the transport direction from the through-hole forming processing position, a separate CD-direction tension applying step of applying tension to the composite sheet in the CD direction is provided,
The method of manufacturing a sheet-like member according to an absorbent article, wherein, in the through-hole forming step, the through-hole is formed in the composite sheet in a state where the tension in the CD direction is applied. An apparatus for manufacturing a sheet-like member having a plurality of through holes formed from a composite sheet continuous in a predetermined direction,
The first non-woven fabric continuous in the predetermined direction and the second non-woven fabric continuous in the predetermined direction while being overlapped with the first non-woven fabric in the thickness direction of the composite sheet, while being extended in the predetermined direction. A plurality of elastic members along the predetermined direction, the composite sheet inserted and fixed in a state of being arranged in a CD direction intersecting the predetermined direction, a conveying device that conveys the predetermined direction as the conveying direction,
A through-hole that penetrates the composite sheet in the thickness direction by pushing a pushing member in the thickness direction at a position between the elastic members adjacent to each other in the CD direction in the composite sheet; A forming device;
A CD-direction tension applying device for applying a tension in the CD direction to the composite sheet at a position downstream of the through-hole forming processing position at which the through-hole forming device forms the through-hole in the composite sheet in the transport direction; When,
A processing device that performs processing on the composite sheet at a position downstream in the transport direction from a tension application position where the CD-direction tension applying device applies the tension in the CD direction to the composite sheet. An apparatus for manufacturing a sheet-shaped member according to an absorbent article characterized by the above.

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