JP6438845B2 - Absorbent article manufacturing method and absorbent article manufacturing apparatus - Google Patents

Description

  The present invention relates to a method for manufacturing an absorbent article such as a disposable diaper, an absorbent article manufacturing apparatus, and an absorbent article.

  Conventionally, disposable diapers are known as absorbent articles that absorb excrement such as urine.

Japanese Patent Laid-Open No. 9-10261

  FIG. 1A is a schematic front view of a disposable diaper 1 ′ of a reference example in a completed state. 1B is a schematic plan view of the diaper 1 ′ in a state before completion, and FIG. 1C is a cross-sectional view taken along the line CC in FIG. 1B.

  In the production line of this disposable diaper 1 ', the diaper 1' has an absorbent main body 10 in which both end portions 10eLa 'and 10eLb' in the longitudinal direction are formed in a substantially V shape in the state before completion of FIGS. 1B and 1C. And a pair of stretchable belt members 30 ′ and 30 ′ arranged in a line in the width direction intersecting the longitudinal direction of the absorbent main body 10 ′ while being superimposed on the absorbent main body 10 ′ ing. Here, the absorbent main body 10 ′ has an absorber 11 ′ that absorbs liquid. Further, the pair of belt members 30 ′ and 30 ′ are leg opening portions 30HL ′ and 30HL ′, and folding lines L30 ′ for folding the belt member 30 ′ in the width direction, respectively, and the width of the belt member 30 ′. And both end portions 30ew1 ′ and 30ew2 ′ in the direction have the same folding line L30 ′ for folding back so as to be positioned on the inner side in the width direction than the folding line L30 ′. Then, the belt member 30 ′ folded back at the folding line L30 ′ is arranged in the width direction of the absorbent main body 10 ′ via the end portion 30ew2 ′ located on the outer side in the width direction of the both end portions 30ew1 ′ and 30ew2 ′. Is joined to the end portion 10ew ′. The belt members 30 ′ and 30 ′ are also joined by welding or the like at the substantially V-shaped end portions 10 eLa ′ and 10 eLb ′ of the absorbent main body 10 ′.

  And in such a state before completion, as shown to FIG. 1B, opening each end part 30ew1 'and 30ew1' located inside a pair of belt member 30 'and 30' on both sides of the said width direction In the process of folding each belt member 30 ′, 30 ′ in half at the substantially central position CLL 30 ′ in the longitudinal direction, if the absorbent main body 10 ′ is folded in half at the substantially central position CLL 10 ′ in the longitudinal direction, each belt member The end portions 30ew1 ′ and 30ew1 ′ located on the inner side in the width direction of 30 ′ cooperate with each other to form the waist opening 1HB ′ of the diaper 1 ′, and the leg portions of the belt members 30 ′ and 30 ′. The openings 30HL ′ and 30HL ′ are located on both sides in the width direction of the absorbent main body 10 ′, and can be worn as a pant-type diaper 1 ′ as shown in FIG. 1A. To become.

  However, when manufacturing the diaper 1 ′, it is necessary to fold the belt member 30 ′ shown in FIGS. 1B and 1C in the width direction along the fold line L30. The degree of difficulty is further increased particularly when the belt member 30 'has stretchability or an opening.

  Here, the reason why the above folding process is necessary at the time of manufacture is that the end 30ew2 ′ in the width direction of the belt member 30 ′ is changed to the end 10ew ′ in the width direction of the absorbent main body 10 ′ as shown in FIG. 1C. As a fixing structure to be fixed, a structure in which an end 30ew2 ′ of the belt member 30 ′ is interposed between a top sheet 13 ′ forming the skin side surface of the absorbent main body 10 and a back sheet 15 ′ forming the non-skin side surface is adopted. Because it is. That is, the folding process is essential because the end 30ew2 'of the belt member 30' is in contact with the non-skin side of the top sheet 13 '. Therefore, for example, as shown in the schematic cross-sectional view of FIG. 1D, the end 30ew2 ′ is overlapped and fixed to the end 10ew ′ in the width direction of the absorbent main body 10 ′ from the skin side of the absorbent main body 10 ′. By doing so, it is considered that the folding process can be omitted.

  The present invention has been made in view of the conventional problems as described above, and its purpose is to absorb the liquid and the absorbent body from the skin side in the thickness direction of the absorbent body. When the absorbent article having a pair of belt members arranged in the width direction while being superimposed on each other is manufactured, the folding process of the first base material sheet for forming the belt member can be omitted. Thus, it is intended to facilitate manufacture of the absorbent article.

The main invention for achieving the above object is:
A method of manufacturing an absorbent article,
The absorbent article has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other in a state before completion, an absorbent main body that absorbs liquid, and a skin side in the thickness direction of the absorbent main body And a pair of belt members arranged side by side in the width direction,
The belt member has a leg opening;
Forming the leg-hole opening in a first base sheet continuous in the longitudinal direction for forming the belt member;
In the thickness direction of the second base material sheet, the first base material sheet in which the leg opening is formed is connected to a second base material sheet that is continuous in the longitudinal direction for forming the absorbent main body. While overlapping from the skin side, a portion of the first base material sheet that is located on the outer side in the width direction with respect to the opening around the leg is disposed on the second base sheet in a portion facing the portion. And overlapping and fixing from the skin side in the thickness direction of the material sheet ,
In forming the leg-hole opening, the leg-hole opening is formed so as to penetrate the first base sheet together with a reinforcing sheet that is superimposed and fixed on the first base sheet. ,
The reinforcing sheet is a sheet having elasticity in the longitudinal direction,
The reinforcing sheet is a method for producing an absorbent article, wherein the reinforcing sheet is fixed to the first base sheet in a state of extending in the longitudinal direction.
Also,
An absorbent article manufacturing apparatus comprising:
The absorbent article has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other in a state before completion, an absorbent main body that absorbs liquid, and a skin side in the thickness direction of the absorbent main body And a pair of belt members arranged side by side in the width direction,
The belt member has a leg opening;
A forming device for forming the leg-hole openings in a first base sheet continuous in the longitudinal direction for forming the belt member;
In the thickness direction of the second base material sheet, the first base material sheet in which the leg opening is formed is connected to a second base material sheet that is continuous in the longitudinal direction for forming the absorbent main body. While overlapping from the skin side, a portion of the first base material sheet that is located on the outer side in the width direction with respect to the opening around the leg is disposed on the second base sheet in a portion facing the portion. A fixing device that overlaps and fixes from the skin side in the thickness direction of the material sheet ,
The forming device for forming the leg-hole opening portion forms the leg-hole opening portion so as to penetrate the first base material sheet together with a reinforcing sheet that is superimposed and fixed on the first base material sheet. ,
The reinforcing sheet is a sheet having elasticity in the longitudinal direction,
The reinforcing sheet is an absorbent article manufacturing apparatus, wherein the reinforcing sheet is fixed to the first base sheet in a state of extending in the longitudinal direction.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  According to the present invention, an absorbent main body that absorbs liquid, a pair of belt members that are arranged side by side in the width direction while being superimposed on the absorbent main body from the skin side in the thickness direction of the absorbent main body, When manufacturing the absorbent article having the above, the folding process of the first base sheet for forming the belt member can be omitted, and the manufacture of the absorbent article can be facilitated.

It is a schematic front view of the disposable diaper 1 'of the reference example in a completed state. FIG. 2 is a schematic plan view of the diaper 1 ′ in a state before completion. It is CC sectional drawing in FIG. 1B. It is a schematic sectional drawing of the example of fixing structure of edge part 10ew 'and 30ew2' which do not require a folding process. It is the schematic front view which looked at the diaper 1 of the completion state of this embodiment from the ventral side. It is the schematic plan view which looked at the diaper 1 of the extended plate state which is a state before completion from the belt member 30 side. It is the schematic plan view which looked at the same diaper 1 from the absorptive main body 10 side. It is VV sectional drawing in FIG. It is a schematic plan view of the state which decomposed | disassembled the diaper 1 of the extended plate state of FIG. 3 into the three components 10,30,30. 4 is a schematic cross-sectional view of an example in which an end 30ew2 of the belt member 40 is joined to both an end 13ew of the top sheet 13 and an end 15ew of the back sheet 15. FIG. 4 is a schematic cross-sectional view of an example in which an end portion 30ew2 of a belt member 40 is joined only to an end portion 13ew of a top sheet 13. FIG. It is explanatory drawing of the 1st process of the manufacturing method of this embodiment. It is explanatory drawing of the said 2nd process. It is explanatory drawing of the said 3rd process and a 4th process. FIG. 12A is a schematic cross-sectional view for explaining a joining procedure of the manufacturing method in the third step of the present embodiment, and FIG. 12B is a schematic cross-sectional view for explaining another joining procedure. 13A and 13B are schematic plan views showing the diaper 1 in which the leg opening 30HL of the slit SL mode is formed in the belt member 30 in a stretched state before completion. 14A and 14B are schematic plan views showing the diaper 1 in which the leg opening 30HL in the slit SL mode is formed in the belt member 30 in a stretched state before completion.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A method of manufacturing an absorbent article,
The absorbent article has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other in a state before completion, an absorbent main body that absorbs liquid, and a skin side in the thickness direction of the absorbent main body And a pair of belt members arranged side by side in the width direction,
The belt member has a leg opening;
Forming the leg-hole opening in a first base sheet continuous in the longitudinal direction for forming the belt member;
In the thickness direction of the second base material sheet, the first base material sheet in which the leg opening is formed is connected to a second base material sheet that is continuous in the longitudinal direction for forming the absorbent main body. While overlapping from the skin side, a portion of the first base material sheet that is located on the outer side in the width direction with respect to the opening around the leg is disposed on the second base sheet in a portion facing the portion. A method of manufacturing an absorbent article, comprising: overlapping and fixing from the skin side in the thickness direction of the material sheet.

  According to such a method for manufacturing an absorbent article, the first base sheet is superposed on the second base sheet from the skin side of the second base sheet, while the portion related to the first base sheet is changed to the first base sheet. 2 Overlay and fix the above-mentioned part relating to the second base sheet from the skin side of the base sheet. Therefore, if the above-mentioned portion relating to the first base sheet is temporarily fixed to the second base sheet from the non-skin side of the second base sheet, the folding process of the first base sheet is omitted. As a result, the manufacture of the absorbent article can be facilitated.

A method of manufacturing such an absorbent article,
Based on the first base sheet, a plurality of the belt members have a continuous belt member continuous in the longitudinal direction,
In the fixing, it is desirable to fix the continuous body of the belt member to the second base sheet.

  According to such a method for manufacturing an absorbent article, after a belt member continuum is generated, the belt member continuum is fixed to the second base sheet of the absorbent main body. Therefore, in the production process of the belt member continuum, a process specialized in the production can be performed, and as a result, the belt member continuum can be produced with high dimensional accuracy. Moreover, the production | generation process can be stabilized and this contributes to the manufacture of an absorbent article easily.

A method of manufacturing such an absorbent article,
In the case where the first base sheet is divided into two regions in the width direction, in forming the leg opening, the leg opening is formed in one of the two regions. However, the leg opening is not formed in the other region,
It is desirable that at least one of the regions does not have a folding line for folding the first base sheet in the width direction.

  According to such a manufacturing method of an absorbent article, at least the folding process is not performed in the one region where the folding process is difficult to be performed due to the leg opening. Therefore, the manufacture of the absorbent article can be facilitated.

A method of manufacturing such an absorbent article,
It is desirable not to perform a folding process for folding the first base sheet in the width direction.

  According to such a method for manufacturing an absorbent article, the first base sheet is not folded back in the width direction. Therefore, the manufacture of the absorbent article can be facilitated.

A method of manufacturing such an absorbent article,
In the fixing, it is preferable that a continuous body of thread-like elastic members along the longitudinal direction is fixed in a predetermined state in the first base sheet in an elongated state in the longitudinal direction.

  According to such a method for manufacturing an absorbent article, stretchability can be imparted to the belt member.

A method of manufacturing such an absorbent article,
In forming the leg-hole opening, the leg-hole opening is formed so as to penetrate the first base sheet together with the reinforcing sheet that is superimposed and fixed on the first base sheet. Is desirable.

  According to the manufacturing method of such an absorbent article, since the peripheral part of the leg opening part in a belt member can be reinforced with a reinforcement sheet, the damage in a leg part opening part can be prevented effectively.

A method of manufacturing such an absorbent article,
The reinforcing sheet is a sheet having elasticity in the longitudinal direction,
It is desirable that the reinforcing sheet is fixed to the first base sheet in a state of extending in the longitudinal direction.

  According to the manufacturing method of such an absorbent article, a gather can be formed in the leg-hole opening based on the stretchability of the reinforcing sheet. As a result, the fit of the opening around the leg can be improved and leakage of excrement such as urine from the opening around the leg can be effectively prevented.

A method of manufacturing such an absorbent article,
In forming the leg-hole opening, it is desirable that a continuous body of thread-like elastic members along the longitudinal direction is overlapped and fixed to the reinforcing sheet while being stretched in the longitudinal direction. .

According to such a manufacturing method of an absorbent article, the gathers can be more reliably formed in the leg opening.
In addition, when the leg opening is formed through the base sheet and the reinforcing sheet, a tensile force along the longitudinal direction can act on the reinforcing sheet from the continuous body of the thread-like elastic member. Therefore, the attitude | position of the reinforcement sheet at the time of forming a leg periphery opening part can be stabilized, As a result, a leg periphery opening part can be stably penetrated and formed.

A method of manufacturing such an absorbent article,
The absorbent main body is disposed on the non-skin side of the absorbent core, the skin side sheet disposed on the skin side of the absorbent core in the thickness direction, and the absorbent core. A non-skin side sheet,
The second base sheet is preferably a continuous sheet in which the non-skin side sheet is continuous in the longitudinal direction.

  According to such a method for manufacturing an absorbent article, it is possible to manufacture an absorbent article in a form in which a belt member is bonded to a non-skin side sheet.

A method of manufacturing such an absorbent article,
The absorbent main body is disposed on the non-skin side of the absorbent core, the skin side sheet disposed on the skin side of the absorbent core in the thickness direction, and the absorbent core. A non-skin side sheet,
The second substrate sheet is preferably a continuous sheet in which the skin side sheet is continuous in the longitudinal direction.

  According to such a method for manufacturing an absorbent article, it is possible to manufacture an absorbent article having a form in which a belt member is bonded to a skin-side sheet.

A method of manufacturing such an absorbent article,
In forming the leg-hole opening, the leg-hole opening is preferably formed in an asymmetric shape that is not line-symmetric with respect to a straight line along the longitudinal direction.

  According to such a manufacturing method of an absorbent article, since the leg opening is formed in an asymmetric shape, the fit of the leg opening to the leg of the wearer can be improved.

Also,
An apparatus for manufacturing such an absorbent article,
The absorbent article has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other in a state before completion, an absorbent main body that absorbs liquid, and a skin side in the thickness direction of the absorbent main body And a pair of belt members arranged side by side in the width direction,
The belt member has a leg opening;
A forming device for forming the leg-hole openings in a first base sheet continuous in the longitudinal direction for forming the belt member;
In the thickness direction of the second base material sheet, the first base material sheet in which the leg opening is formed is connected to a second base material sheet that is continuous in the longitudinal direction for forming the absorbent main body. While overlapping from the skin side, a portion of the first base material sheet that is located on the outer side in the width direction with respect to the opening around the leg is disposed on the second base sheet in a portion facing the portion. An apparatus for manufacturing an absorbent article, comprising: a fixing device that overlaps and fixes the material sheet from the skin side in the thickness direction.

  According to such an absorbent article manufacturing apparatus, the same effects as those of the manufacturing method described above can be achieved.

Furthermore,
An absorbent article having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other,
An absorbent main body that absorbs liquid, and a pair of belt members that are arranged side by side in the width direction while being superimposed on the absorbent main body from the skin side in the thickness direction of the absorbent main body. ,
The belt member has a leg opening;
A portion of the belt member that is located outside the leg opening in the width direction is overlapped with a portion of the absorbent main body facing the portion from the skin side in the thickness direction of the absorbent main body. It is the absorbent article characterized by being fixed.

  According to such an absorbent article, the folding process of the base material sheet for forming the belt member can be omitted at the time of manufacturing the absorbent article. As a result, the absorbent article can be easily manufactured.

=== This Embodiment ===
The manufacturing method and manufacturing apparatus of the absorbent article of this embodiment are used in the manufacturing line of the disposable diaper 1 as an example of an absorbent article, for example.
FIG. 2: is the schematic front view which looked at the diaper 1 of the completion state of this embodiment from the ventral side. FIG. 3 is a schematic plan view of the diaper 1 in a stretched state, which is a state before completion, viewed from the belt member 30 side, and FIG. 4 is a schematic plan view of the diaper 1 viewed from the absorbent main body 10 side. . FIG. 5 is a VV cross-sectional view in FIG. Further, FIG. 6 is a schematic plan view of a state in which the diaper 1 in the extended plate state of FIG. 3 is disassembled into three parts 10, 30, 30. Incidentally, FIG. 3 to FIG. 6 are diagrams in which the diaper 1 is extended in the longitudinal direction and the width direction until there is no gather, which is shown later in FIG. 7, FIG. 8, FIG. The same applies to FIG.

  The diaper 1 is in a flat plate extending state (corresponding to a state before completion) as shown in FIG. 3 at the final stage of the manufacturing process. Specifically, first, the absorbent main body 10 to be placed between the crotch of the wearer is a sheet-like member having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other, and each end portion 10eLa in the longitudinal direction. , 10eLb each have a substantially V-shaped tapered shape. Moreover, a pair of belt members 30 and 30 which should mainly be distribute | arranged to a waist part of a wear subject are superimposed on the skin side surface of the absorptive main body 10 like FIG. 5, and an absorptive main body like FIG. 10 are arranged side by side in the width direction intersecting with the longitudinal direction. Each belt member 30 and 30 has elasticity in the longitudinal direction and has one leg opening 30HL and 30HL. As shown in FIGS. 3 and 5, the belt member 30 has an end in the width direction of the absorbent main body 10 via an end portion 30 ew 2 positioned on the outer side in the width direction of the above-described both end portions 30 ew 1 and 30 ew 2. It is joined to the part 10ew with a hot melt adhesive or the like. Here, the outer end 30ew2 is located on the outer side in the width direction of the leg opening 30HL, which is also formed on the belt member 30, so that the completed state of FIG. When the diaper 1 is worn, the leg opening 30HL can perform its original function of being able to pass the wearer's leg quickly. Moreover, as shown in FIG. 3, each belt member 30 and 30 is joined also by welding etc. also at each said edge part 10eLa and 10eLb of the substantially V shape of the absorptive main body 10. FIG.

  Then, from such a state of extending the plate, each belt member 30 is opened while opening the end portions 30ew1 and 30ew1 positioned on the inner side in the width direction in the pair of belt members 30 and 30 on both sides in the width direction (FIG. 3). If the absorbent main body 10 is folded in half at the substantially central position CLL10 in the longitudinal direction in the process of being folded in half at the substantially central position CLL30 in the longitudinal direction, the end portions 30ew1 and 30ew1 on the inner sides in the width direction of the belt members 30 and 30 Form the waist opening 1HB of the diaper 1 in cooperation with each other, and the leg openings 30HL, 30HL of the belt members 30, 30 are located on both sides in the width direction of the absorbent main body 10, respectively. Thereby, it will be in the state which can be worn as the underpants type diaper 1 as shown in FIG.

  In the following, each component 10, 30, 30 will be described mainly with reference to the diaper 1 in the stretched plate state of FIG. 3, but the longitudinal direction, the width direction of the absorbent body 10 in the stretched plate state, The thickness direction and the thickness direction substantially coincide with the longitudinal direction, the width direction, and the thickness direction of the diaper 1 in the same plate state. Therefore, in the following description, these directions are simply referred to as “longitudinal direction”, “width direction”, and “thickness direction”. In addition, for the longitudinal direction, one side is located on the abdomen side of the wearing subject and the other side is located on the back side of the wearing subject, so one side is also referred to as “abdominal side” or “front side”, and the other side The side is also referred to as “back side” or “rear side”. Furthermore, regarding the thickness direction, the side in contact with the wearer is also referred to as “skin side”, and the opposite side is also referred to as “non-skin side”. The width direction is also referred to as “left-right direction”.

As shown in the schematic exploded view of FIG. 6, the absorbent main body 10 is a sheet-like member in which each of the end portions 10 eLa and 10 eLb in the longitudinal direction is tapered in a substantially V shape in plan view, A top sheet 13 (corresponding to the skin side sheet) provided covering the absorbent body 11 from the skin side, and a back sheet 15 (corresponding to the non-skin side sheet) provided covering the absorbent body 11 from the non-skin side. And having.
Each of the members 13, 11, and 15 is joined to a member adjacent in the thickness direction by a hot melt adhesive or the like. Examples of the application pattern of the adhesive include an Ω pattern, a spiral pattern, and a stripe pattern, and the same applies to other adhesives that appear later.

As shown in FIG.5 and FIG.6, the absorber 11 has the liquid absorptive absorptive core 11c and the core wrap sheet | seat (not shown) which coat | covers the outer peripheral surface of the same core 11c. The absorbent core 11c is a molded body obtained by molding a predetermined liquid absorbent material into a substantially hourglass shape in plan view as an example of a predetermined shape. Examples of the liquid-absorbing material include liquid-absorbing fibers such as pulp fibers, and liquid-absorbing granular materials such as superabsorbent polymers (so-called SAP). (g / m ² ) pulp fiber and SAP having a basis weight (g / m ² ) in a predetermined range are mixed and used. However, the present invention is not limited to this. Moreover, liquid permeable sheets, such as tissue paper and a nonwoven fabric, can be used for a core wrap sheet. Further, the shape of the absorbent core 11c is not limited to the above-mentioned substantially hourglass shape in plan view, but may be other shapes.

  As shown in FIGS. 5 and 6, the top sheet 13 is formed of a liquid permeable sheet such as an air-through nonwoven fabric, and the planar size thereof protrudes from both sides in the longitudinal direction and both sides in the width direction of the absorbent body 11. It is a size like this. Moreover, since each edge part of a longitudinal direction comprises each edge part 10eLa and 10eLb of the absorptive main body 10, the dimension of the width direction becomes small, respectively, as the shape progresses to the belly side or back side of a longitudinal direction, respectively. The above-mentioned substantially V-shaped tapered shape is formed.

  The back sheet 15 is also a planar sheet that protrudes from both sides in the longitudinal direction and both sides in the width direction of the absorber 11, and each end in the longitudinal direction absorbs the same as the top sheet 13. Since the end portions 10eLa and 10eLb of the main body 10 are formed, the shape thereof is the above-mentioned substantially V-shaped taper shape in which the dimension in the width direction becomes smaller as proceeding to the ventral side or the back side in the longitudinal direction. I am doing. The top sheet 13 and the back sheet 15 are overlapped in the thickness direction so that the substantially V-shapes of both end portions thereof are substantially aligned, whereby the absorber is interposed between the sheets 13 and 15. 11 is held.

  As an example of the material of the back sheet 15, as shown in FIG. 5, a liquid-impermeable leak-proof sheet 15 f such as a polyethylene (PE) film or a polypropylene (PP) film, and the non-skin side of the leak-proof sheet 15 f A laminate sheet 15 having a two-layer structure having a non-woven fabric outer sheet 15n bonded to the sheet can be mentioned, and here, this is used, but if it has a certain leak-proof property, Not limited to this. Further, in this example, the planar size of the leak-proof sheet 15f is smaller than the planar size of the exterior sheet 15n, and thereby, on the inner side in the longitudinal direction and the inner side in the width direction than the outer peripheral edge of the exterior sheet 15n. The leak-proof sheet 15f is accommodated, but the present invention is not limited to this, and the same size may be used.

  As shown in FIGS. 3 and 6, the pair of belt members 30 and 30 are respectively sheet-like members that are long in the longitudinal direction. In this example, two nonwoven fabrics 31 and 32 are stacked in the thickness direction as shown in FIG. Is formed. Also, as shown in FIG. 5, the pair of belt members 30, 30 are superimposed on the absorbent main body 10 from the skin side of the absorbent main body 10. Specifically, the skin side surface of one belt member 30 of the pair of belt members 30, 30 is overlapped so as to abut on the left side portion of the skin side surface of the absorbent main body 10. The skin side surface is overlaid so as to contact the right side portion of the skin side surface of the absorbent main body 10. As a result, the pair of belt members 30 are in a mirror image relationship with respect to the center position CLW10 in the width direction of the absorbent main body 10, as shown in FIGS.

  Further, as described above with reference to FIG. 3 and FIG. 5, the end portion 30 ew <b> 2 located on the outer side in the width direction of both end portions 30 ew <b> 1 and 30 ew <b> 2 in the width direction of the belt member 30 ( The portion located on the outer side in the width direction with respect to the opening ”corresponds to the end 10ew in the width direction as a portion facing the end 30ew2 in the absorbent main body 10 from the skin side of the absorbent main body 10. These end portions 30ew2 and 10ew are joined (fixed) with a hot melt adhesive or the like over substantially the entire length in the longitudinal direction. That is, the end portion 30ew2 of the belt member 30 of the present embodiment does not employ the folded structure as described at the beginning with reference to FIG. 1C. Therefore, in the manufacturing line of the diaper 1 mentioned later, the folding process of the said edge part 30ew2 is abbreviate | omitted, and thereby the manufacture of the diaper 1 is facilitated.

Here, the joint structure between the end portions 30ew2 and 10ew will be described in detail. In this example, as shown in FIG. 5, the end portion 15ew of the backsheet 15 is more than the end portion 13ew in the width direction of the topsheet 13. Also projecting outward in the width direction, the projecting end portion 15ew forms the end portion 10ew of the absorbent main body 10. Therefore, the end 30ew2 of the belt member 30 is joined to the end 15ew of the backsheet 15 from the skin side. As a result, in this example, the end portion 30ew2 of the belt member 30 is not joined to the top sheet 13, but is joined only to the back sheet 15. However, it is not limited to this.
For example, as shown in FIG. 7, when the top sheet 13 has such a size that the end portion 13 ew in the width direction of the top sheet 13 reaches the position of the end portion 30 ew 2 of the belt member 30, the back sheet The end 30ew2 of the belt member 30 may be joined to the end 13ew of the top sheet 13 in addition to the 15 end 15ew. Further, as shown in FIG. 8, when the dimension in the width direction of the top sheet 13 is set so as to cover the end 30ew2 of the belt member 30 over the entire area in the width direction, The end 30ew2 of the member 30 is joined only to the end 13ew of the top sheet 13 and may not be joined to the end 15ew of the backsheet 15.
Desirably here, in any of the examples of FIGS. 5, 7, and 8, the dimension in the width direction of the top sheet 13 is within the width direction of the leak-proof sheet 15 f of the back sheet 15. It is preferable that the dimensions are as described above, and if this is done, the urine wraparound phenomenon to the non-skin side of the back sheet 15 can be prevented. That is, the situation where urine reaches the exterior sheet 15n of the back sheet 15 through the liquid-permeable top sheet 13 to the outside in the width direction, and then wraps around the non-skin side of the back sheet 15 via the exterior sheet 15n. Can be effectively prevented.

On the other hand, this is also partly as described above, but as shown in FIG. 6, both end portions 30eLa, 30eLb in the longitudinal direction of each belt member 30 are substantially V-shaped end portions 10eLa, Overlaid and fixed on each half in the width direction at 10 eLb. Therefore, the shapes of both end portions 30eLa and 30eLb of the belt member 30 are inclined so as to overlap the respective half portions in the width direction of the substantially V-shaped both end portions 10eLa and 10eLb. The end portions 30eLa and 30eLb in the longitudinal direction of the member 30 are joined to the corresponding end portions 10eLa and 10eLb of the absorbent main body 10 by welding or the like in a state where they overlap each other in the thickness direction.
Further, as shown in FIGS. 3 and 6, the leg opening 30HL has the belt member 30 in the thickness direction at a position inside the width direction with respect to the width direction end portion 30ew2 joined to the absorbent main body 10. It is formed through. As a result, it is possible to avoid the malfunction of the leg opening 30HL that may occur when the leg opening 30HL is formed outside the end 30ew2 in the width direction. The rotation opening 30HL can surely fulfill the original function of passing the leg of the wearer.

  Furthermore, in this example, the leg-hole opening 30HL is formed in an asymmetric shape that is not line-symmetric with respect to a straight line along the longitudinal direction. The asymmetric shape is determined in consideration of the shape of the leg around the wearer. Therefore, the good fit property to a wear subject's leg circumference can be produced. Incidentally, for determining whether the shape of the leg opening 30HL is symmetric or asymmetric, for example, the longitudinal direction and the width direction until the gathers of the leg opening 30HL disappear as shown in FIG. 3 or FIG. This can be done by visually observing the shape of the leg opening 30HL with the diaper 1 extended, or by visually observing the shape of the punching blade of a die cutter device described later.

  Further, as shown in FIGS. 5 and 6, for the purpose of imparting stretchability to the belt member 30, a thread rubber or the like is provided along the longitudinal direction between the two nonwoven fabrics 31, 32 of the belt member 30. Are inserted in a line in the width direction. That is, the thread-like elastic members 35, 35... Are fixed to the nonwoven fabrics 31 and 32 with a hot melt adhesive or the like while being stretched to a predetermined stretch ratio in the longitudinal direction. 30 has a longitudinal stretchability.

  Here, in this example, some of the thread-like elastic members 35, 35... Are arranged in the belt member 30 between the leg opening 30HL and the waist opening 1HB. However, at least one other elastic member 35 is arranged in a portion of the belt member 30 between the leg opening 30HL and the absorbent main body 10. Accordingly, the leg opening 30HL in the belt member 30 is provided with a contraction force in the longitudinal direction at each position on both sides in the width direction, so that the leg opening 30HL extends substantially over the entire circumference. As a result, it shrinks while forming a plurality of wrinkles, and as a result, gathers are formed over substantially the entire circumference.

  Further, in this example, as shown in FIGS. 5 and 6, a reinforcing sheet 40 (see the dot pattern portion in FIG. 6) is provided for the purpose of reinforcing the leg opening 30HL. That is, a belt-shaped reinforcing sheet 40 having an opening of the same shape as the leg hole opening 30HL is interposed between the two nonwoven fabrics 31 and 32 related to the belt member 30, and thereby the leg hole opening. The peripheral portion of the portion 30HL is reinforced over its entire circumference. In this example, as the reinforcing sheet 40, for example, a stretchable sheet having stretchability that can be stretched without breaking up to an arbitrary magnification of 1.5 times to 4.0 times the natural length is used. The reinforcing sheet 40 is also fixed to the nonwoven fabrics 31 and 32 with a hot melt adhesive or the like in a state where the reinforcing sheet 40 is stretched to a predetermined stretch ratio in the longitudinal direction. Therefore, the said reinforcement sheet 40 can also contribute effectively to formation of the gathering to the leg periphery opening part 30HL. In addition, as an example of such an elastic sheet, a so-called gear stretching process is performed on a nonwoven fabric having substantially elastic elastomer fibers such as polyurethane elastomers and substantially non-elastic thermoplastic resin fibers such as polyolefin resins. Although the nonwoven fabric which gave and can express the elasticity can be illustrated and this is used in this example, it is not restricted to this at all. Furthermore, the reinforcing sheet 40 may not have the above-described stretchability.

9 to 11 are explanatory diagrams of the method for manufacturing the diaper 1. The diaper 1 is manufactured by a so-called “longitudinal flow method” on a manufacturing line. In the longitudinal flow method, while the intermediate product of the diaper 1 is transported with the longitudinal direction of the absorbent main body 10 as the transport direction, various processes and joining of other parts are sequentially performed, and finally the above-described stretched plate state The diaper 1 is manufactured. In FIGS. 9 to 11, the intermediate product is illustrated as a single sheet of diaper for the sake of space, but the actual intermediate product is a continuous or continuous sheet that is continuous in the conveying direction. Is in a state.
In addition, the intermediate product is transported using a known transport device (not shown) such as a belt conveyor such as a suction belt conveyor or a transport roller. In the following, it is assumed that these conveying devices are used as appropriate unless otherwise specified. Furthermore, as described above, since the transport direction is along the longitudinal direction of the absorbent main body 10, the transport direction is orthogonal to the thickness direction and the width direction of the absorbent main body 10. In this production line, the direction corresponding to the width direction is also referred to as “CD direction”.

In the manufacturing method of this embodiment, the diaper 1 in the state of the above-described extended plate in FIG. 3 is manufactured through the following first to fourth steps.
1st process: The production | generation process of the continuous body 10a of an absorptive main body 2nd process: The production | generation process of a continuous body 30a, 30a of a pair of belt member 3rd process: The continuous body of the absorptive main body 10a and a pair of belt member Joining process with 30a, 30a 4th process: Dividing process with product pitch P1 Hereinafter, each process is demonstrated.

<< First Step: Step of Producing Absorbent Main Body 10a >>
As shown in FIG. 9, in this process, a plurality of absorptive main bodies 10, 10,... Are transported with the continuous direction as the transport direction.

  Specifically, first, as shown in the left diagram of FIG. 9, the continuous sheet 15 a (corresponding to the second base sheet) of the back sheet 15 is conveyed with the continuous direction as the conveying direction. In this example, the exterior sheet 15n related to the back sheet 15 is a continuous sheet 15na continuous in the conveying direction, but the leak-proof sheet 15f is discrete on the continuous sheet 15na of the exterior sheet 15n at a product pitch P1. It is a sheet-like sheet 15f arranged in the. However, it is not limited to this. That is, the leak-proof sheet 15f may also be a continuous sheet that is continuous in the conveyance direction.

Next, the absorbent body 11 generated by using a fiber staking apparatus (not shown) is placed on each leakage prevention sheet 15f one by one as shown in the central view of FIG. 9 and joined with a hot melt adhesive or the like. To do. Such placement processing is performed by a rotating drum device (not shown) or the like.
At the same time or after this, the top sheet 13 is supplied in the form of a continuous sheet 13a along the conveying direction toward the skin side of each absorber 11 as shown in the right figure of FIG. The side surfaces are covered with a continuous sheet 13 a of the top sheet 13 and bonded with a hot melt adhesive or the like. And the continuous body 10a of an absorptive main body is produced | generated by this.

  In addition, as an example of the fiber stacking device, a device that generates the absorbent core 11c by adsorbing the liquid absorbent material sprayed from the duct to the bottom surface of the recess formed on the outer peripheral surface of the rotating drum can be cited. Moreover, as an example of the rotating drum device, a rotating drum having an outer peripheral surface capable of adsorbing and holding the absorber 11 can be cited. Since both apparatuses have a well-known configuration, detailed description thereof is omitted.

<< Second Step: Step of Generating Continuous Pairs 30a and 30a of a Pair of Belt Members >>
As shown in FIG. 10, this step (corresponding to “generating a belt member”) is the same as the “first step of generating the continuous body 10 a of the absorbent main body” and has no upstream / downstream relationship. It is a process that can be processed in parallel. In this step, a continuous body 30a, 30a of a pair of belt members is generated. The belt member continuous body 30a is a belt member in which a plurality of belt members 30, 30.

First, as shown in the left diagram of FIG. 10, the above-described two-layered nonwoven fabrics 31 and 32 are formed as a base material sheet 30sha for forming a belt member continuous body 30a, and the continuous sheets 31a and 32a are continuously formed in the conveying direction. Is transported from the upstream process. And since the continuous body 30a of a pair of belt members and 30a are finally produced | generated from this base material sheet 30sha, the dimension of the CD direction of the said base material sheet 30sha is CD of the continuous body 30a of a belt member. The wide size is approximately twice the size in the direction.
Moreover, as shown in the left figure, at this time, the reinforcing sheet 40 is already in the form of a continuous sheet 40a in which the reinforcing sheet 40 is continuous in the transport direction between the continuous sheets 31a and 32a of the two-layered nonwoven fabric that is the base sheet 30sha. In this state, the continuous sheet 40a of the reinforcing sheet is fixed to the base sheet 30sha with a hot melt adhesive or the like.

  Furthermore, at this time, a plurality of thread-like elastic members 35, 35... Are formed in a continuous body 35a, 35a. In this state, the continuous elastic members 35a, 35a,... Are stretched to the base sheet 30sha with a hot melt adhesive or the like. It is fixed.

  In this step, first, the base sheet 30sha in such a state passes through a slitter device (not shown) disposed at a predetermined position in the transport direction. At the time of the passage, the base sheet 30sha is divided into two at the center position in the CD direction by the slitter device, so that the dimension in the CD direction is half as shown in the center view of FIG. A pair of narrow base sheet 30sa and 30sa is generated. An example of the slitter device is a known device having a rotary blade, but is not limited thereto.

  Next, the pair of narrow base sheets 30sa and 30sa (corresponding to the first base sheet) pass through a widening device (not shown) disposed downstream of the slitter device in the transport direction. At the time of the passage, the narrow base material sheets 30sa and 30sa are slightly moved to the outside in the CD direction by the widening device, whereby the base material sheets 30sa and 30sa are respectively moved as shown in the central view. A space D30sa is formed between them. Here, the size of the distance D30sa is the same value as the distance D30 in the width direction between the pair of belt members 30 in the extended state of FIG. 3, but this is the absorption performed thereafter. This is for joining the end portions 30saew2 of the base material sheets 30sa and 30sa on the outer side in the CD direction to the end portions 10aew and 10aew in the CD direction of the continuous body 10a when the continuous body 10a of the sex body is joined. Further, as an example of the widening device, a known device having a roller whose rotation direction is inclined to the outside of the CD direction with respect to the transport direction at each position on both sides of the CD direction can be mentioned. Absent.

  Then, each of the narrow base sheet 30sa and 30sa having a CD direction interval D30sa between them is a die cutter device (corresponding to a forming device) arranged downstream in the transport direction from the widening device. Pass through (not shown). And the die cutter apparatus at the time of the passage is formed by penetrating the leg openings 30HL, 30HL at the product pitch P1 in the conveying direction with respect to the base sheets 30sa, 30sa as shown in the right diagram of FIG. (Equivalent to “forming the leg-hole opening”), thereby generating a pair of belt member continuums 30a, 30a.

  Here, as shown in the drawing on the right, the die cutter device is more in the CD direction than the outer end portion 30saew2 in the CD direction, which is a portion joined to the continuous body 10a of the absorbent main body in the continuous body 30a of the belt member. The leg opening 30HL is formed in the inner part so as to penetrate the belt member continuous body 30a. Accordingly, the leg opening 30HL can function as the above-described leg opening 30HL without any problem when the diaper is completed.

  At this time, the base sheet 30sa is already provided with the reinforcing sheet 40 in the form of the continuous sheet 40a. Therefore, the leg opening 30HL is formed so as to penetrate not only the base sheet 30sa but also the continuous sheet 40a of the reinforcing sheet. Here, as shown in the right figure, the continuous sheet 40a of the reinforcing sheet includes , Several continuous bodies 35a among the continuous bodies 35a, 35a... Of the above-described thread-like elastic members are superposed in the thickness direction. Therefore, when forming through the leg opening 30HL, a tensile force along the conveying direction can act on the continuous sheet 40a of the reinforcing sheet from the continuous body 35a of the above-described thread-like elastic member. It is possible to stabilize the posture of the continuous sheet 40a of the reinforcing sheet when forming the opening 30HL. As a result, the leg opening 30HL can be stably penetrated and formed in the continuous sheet 40a of the reinforcing sheet.

  Incidentally, in this example, as described above, the reinforcing sheet 40 is the continuous sheet 40a continuous in the conveyance direction, but the invention is not limited to this. That is, a cut sheet may be used. In this case, the reinforcing sheet 40 is intermittently supplied to each formation target portion of the leg opening 30HL that repeatedly appears at the product pitch P1 on the base sheet 30sa and is joined to each formation target portion. .

  Moreover, as an example of the die cutter device, a well-known device having a cutter roll and an anvil roll in the form of a cutting blade can be exemplified, but the invention is not limited to this.

  Further, in this example, the die cutter device is disposed downstream in the transport direction of the slitter device and the widening device, but this is not a limitation. For example, the arrangement order may be reversed. That is, after forming a pair of leg openings 30HL, 30HL in the CD direction on the wide base sheet 30sha with the die cutter device, the wide base sheet 30sha is divided into two at the center position in the CD direction with the slitter device. Then, the pair of narrow base sheets 30sa and 30sa may be generated, and then the narrow base sheets 30sa and 30sa may be moved outward in the CD direction by the widening device. However, if the leg opening 30HL is formed, the conveyance of the base sheet 30sa may become unstable, and this unstable phenomenon is particularly noticeable when the base sheets 30sa and 30sa are moved in the CD direction. Can happen. For this reason, the former is preferably arranged in the order.

  In some cases, the slitter device may be omitted. For example, if two sheet rolls (not shown) are prepared by winding up a continuous sheet whose size in the CD direction has been adjusted in advance to a size corresponding to the narrow base sheet 30sa, the respective sheet rolls. Is rotatably supported by each reel device (not shown) provided in the second step, and the continuous sheet is fed out from the respective sheet rolls in the conveying direction. The process of dividing can be omitted.

<< 3rd process: Joining process of continuous body 10a of absorptive main body and continuous body 30a, 30a of a pair of belt members >>
In this step, the continuous body 10a of the absorbent main body and the continuous bodies 30a, 30a of the pair of belt members are joined. Therefore, this process is directly connected to the downstream side in the transport direction of the above-mentioned first process “generation process of the absorbent body continuum 10a”, and as shown in the left diagram of FIG. At a predetermined position in the transport path of the continuous body 10a, the continuous bodies 30a, 30a of the pair of belt members generated in the second step are joined. In this merging, the base material sheets 30sa and 30sa of the continuous bodies 30a and 30a of the pair of belt members are superposed on the continuous body 10a from the skin side of the continuous body 10a of the absorbent main body. Specifically, in this example, the continuous sheet 15a of the back sheet related to the continuous body 10a of the absorbent main body protrudes outward in the CD direction from the continuous sheet 13a of the top sheet. Therefore, the skin side surfaces of the base material sheets 30sa and 30sa of the continuous bodies 30a and 30a of the belt members are in contact with and overlapped with the skin side surface of the continuous sheet 13a of the top sheet on the center position CLW10 side in the CD direction. At the position on the end side in the CD direction, they are brought into contact with and overlapped with the skin side surface of the continuous sheet 15a of the back sheet.

  At this time, the end 30saew2 in the CD direction of the base material sheet 30sa of the continuous body 30a of each belt member is the end 10aew in the CD direction of the continuous body 10a from the skin side of the continuous body 10a of the absorbent main body. (Corresponding to “the part facing the part in the second base sheet”) and joined (fixed) with a hot-melt adhesive or the like (corresponding to “fixing”). Specifically, on the basis of the size relationship described above, each end portion 15aew in the CD direction on the skin side surface of the continuous sheet 15a of the back sheet protrudes outward in the CD direction from the continuous sheet 13a of the top sheet. Thus, the end 15 aew forms each end 10 aew in the CD direction of the continuous body 10 a of the absorbent main body. Therefore, the belt member from the skin side of the sheet 15a to each end portion 15aew in the CD direction on the skin side surface of the continuous sheet 15a of the back sheet (corresponding to "a portion facing the portion in the second base sheet"). The end portions 30saew2 (corresponding to “the portion located on the outer side in the width direction with respect to the opening in the width direction of the first base material sheet”) of the skin side surface of the base material sheet 30sa of the continuum 30a contact and join (Fixed).

  Therefore, in this third step, the end portion 30saw2 in the CD direction of the base material sheet 30sa related to the belt member continuum 30a is not folded back, and the end 30saw2 is connected to the end 10aew of the absorbent body continuum 10a. It can join, and thereby, manufacture of the diaper 1 can be facilitated.

  In addition, as an example of an apparatus (not shown) that performs this merging, a guide roller that rotates by bringing the continuous body 10a of the absorbent main body into contact with the outer peripheral surface and the continuous body 30a of each belt member contacts the outer peripheral surface. An apparatus (corresponding to a fixing apparatus) having a guide roller that rotates by rotating the guide roller can be given, but the present invention is not limited thereto.

Further, at a position downstream of the joining position in the conveying direction, the absorbent body continuous body 10a and the pair of belt member continuous bodies 30a and 30a are connected to the abdomen end 10eLa and the back side of the absorbent main body 10. Bonding is also performed at a position corresponding to the end portion 10eLb.
Such a joining process can be performed by a known heat seal device (not shown) having an embossing roll and an anvil roll. That is, when the absorbent body continuum 10a in which the continuums 30a and 30a of the pair of belt members are overlapped passes through the position of the heat seal device in the transport direction, the protrusions on the outer peripheral surface of the embossing roll and Due to the outer peripheral surface of the anvil roll, the absorbent body continuous body 10a and the pair of belt member continuous bodies 30a, 30a are located at positions corresponding to the abdominal end 10eLa and the back end 10eLb of the absorbent main body 10. They are pressed together in the thickness direction and joined by welding or the like. Then, substantially V-shaped joint portions ja and jb are formed at the positions corresponding to the abdominal end portion 10eLa and the back end portion 10eLb of the absorbent main body 10 as traces of the joining.

<< Sixth Process: Cutting Process at Product Pitch P1 >>
As shown in the right view of FIG. 11, in this step, the absorbent body continuum 10a in which the continuous body 30a of the pair of belt members is joined at the above-described substantially V-shaped joining portions ja and jb along the conveying direction. During the conveyance, the absorbent body continuum 10a is divided at the product pitch P1 of the diaper 1 and the substantially triangular end materials T, T... Are cut off at positions near the substantially V-shaped joint portions ja, jb. . And thereby, the plate-like diaper 1 of FIG. 3 is manufactured. In addition, although this division | segmentation and excision process can be performed with the known cutter apparatus (not shown) which has the cutter roll and the anvil roll, it is not restricted to this at all.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

  In the above-described embodiment, since the diaper 1 having the cross-sectional structure shown in FIG. 5 is manufactured, the third step “joining step of the absorbent body continuous body 10a and the pair of belt member continuous bodies 30a and 30a” is performed. In FIG. 11, as shown in the left diagram of FIG. 11, the end portions 30saew2 and 30saew2 in the CD direction of the base material sheets 30sa and 30sa of the belt member continuous bodies 30a and 30a are arranged in the CD direction of the continuous sheet 15a of the back sheet. Although it joined only to each edge part 15aew and 15aew, it is not restricted to this at all. That is, when the diaper 1 having the cross-sectional structure shown in FIG. 7 is to be manufactured, the end portions 30saew2 and 30saew2 relating to the base material sheets 30sa and 30sa of the belt member continuums 30a and 30a are replaced with the continuous sheets of the backsheet. It joins to both ends 15aew and 15aew in the CD direction at 15a and ends 13aew and 13aew in the CD direction of the continuous sheet 13a of the top sheet. Similarly, when the diaper 1 having the cross-sectional structure shown in FIG. 8 is to be manufactured, the end portions 30saew2 and 30saew2 relating to the base material sheets 30sa and 30sa of the belt member continuums 30a and 30a are used as the top sheet. It joins only to each edge part 13aew and 13aew of the CD direction in the continuous sheet 13a.

  In the above-described embodiment, as shown in the schematic cross-sectional view of FIG. 12A, a pair of belt member continuums 30a and 30a and an absorbent main body continuum 10a are respectively generated, and then a pair of belt member continuums. Although 30a and 30a and the continuous body 10a of the absorptive main body were joined, it is not restricted to this at all. For example, when manufacturing the diaper 1 having the cross-sectional structure shown in FIG. That is, in this case, as shown in the schematic cross-sectional view of FIG. 12B, the end portion 30saew2 in the CD direction of the base sheet 30sa of the continuous body 30a of the belt member is changed to the end portion 13aew in the CD direction of the continuous sheet 13a of the top sheet. In this case, before the generation of the absorbent body continuous body 10a, the top sheet continuous sheet 13a constituting the continuous body 10a is connected to the pair of belt member continuous bodies 30a, 30a. The substrate sheets 30sa and 30sa may be joined. More specifically, as shown in FIG. 12B, in each of the base sheets 30sa and 30sa of the continuous bodies 30a and 30a of the belt members on the respective end portions 13aew and 13aew in the CD direction on the skin side surface of the continuous sheet 13a of the top sheet. After joining the end portions 30saew2 and 30saew2 in the CD direction, the backsheet continuous sheet 15a to which the absorbent body 11 is joined may be overlapped and joined to the topsheet continuous sheet 13a from the non-skin side. good.

  In the above-described embodiment, the shape of the leg opening 30HL is an asymmetric shape with respect to the straight line along the longitudinal direction of the absorbent main body 10. However, the shape is not limited to this and may be a symmetric shape. Further, in the above-described embodiment, the leg opening 30HL is formed by being punched with a punching blade or the like of a die cutter device. In other words, the leg opening 30HL is formed while generating the same shape as the leg opening 30HL, but the invention is not limited thereto. That is, depending on the case, the leg opening 30HL may be formed in the form of a slit SL, that is, in the form of a cutting line SL such as a straight line, a curved line, a zigzag line, and a wavy line. Debris is not generated when the opening 30HL is formed. In the schematic plan view of the diaper 1 of FIGS. 13A to 14B, the leg opening 30HL of the above four slit SL modes is shown. First, in the example of FIG. 13A, the slit SL is formed in the form of an oblique linear cutting line SL inclined at a predetermined angle other than 0 ° from the longitudinal direction of the absorbent main body 10. In the example of FIG. 13B, the slit SL is formed in the form of an arcuate cutting line SL along the longitudinal direction. Furthermore, in the example of FIG. 14A, the slit SL is formed in the form of a zigzag-shaped cutting line SL along the longitudinal direction. In FIG. 14B, the slit SL is formed in the form of a wave-shaped cutting line SL along the longitudinal direction.

  In the above-described embodiment, as shown in FIG. 5, the belt member 30 is formed by stacking the nonwoven fabrics 31 and 32, but this is not a limitation. That is, it may be formed of a single nonwoven fabric, or may be formed by overlapping three or more nonwoven fabrics. Furthermore, the belt member 30 may be formed using a woven fabric or a film instead of the nonwoven fabric.

In the above-described embodiment, in the production line of the diaper 1, the base sheet 30 sa related to the belt member 30 is not folded back in the CD direction, and thereby the production of the diaper 1 is facilitated. However, it is not limited to this. That is, depending on the case, you may perform the return process which returns the base material sheet 30sa to CD direction.
For example, the end 30saew1 on the inner side in the CD direction of the base sheet 30sa shown in FIG. 10 is a waistline opening 1HB in the completed state of the diaper 1 as shown in FIG. For the purpose of reducing a person's skin stress, it may be folded back in the CD direction only once or a plurality of times and fixed in the folded state with a hot melt adhesive or the like. However, in that case, if the leg opening 30HL is positioned in the vicinity of the folding line for folding, the folding process becomes much more difficult, so the leg opening 30HL is in the vicinity of the folding line. It is desirable not to be located. In this regard, in the example of FIG. 10, the leg opening 30HL is located in the region A30sa2 outside the center line CLW30 in the CD direction of the base sheet 30sa, and more specifically, in the CD direction. It is located in the vicinity of the outer end portion 30saew2, and is thereby far away from the inner end portion 30saew1. Therefore, even if this folding process is performed, the difficulty of the folding process is reduced. By the way, this can be generalized as follows. That is, “When the base sheet 30sa is divided into two areas A30sa1 and A30sa2 in the CD direction, when the leg opening 30HL is formed in the base sheet 30sa, the two of the areas A30sa1 and A30sa2 The leg opening 30HL is formed in one area A30sa2, the leg opening 30HL is not formed in the other area A30sa1, and the base sheet 30sa is placed in the CD direction at least in the one area A30sa2. It is desirable that there is no wrap line for wrapping. "

DESCRIPTION OF SYMBOLS 1 Disposable diaper (absorbent article), 1HB waistline opening part, 10 absorbent main body, 10ew end part (part), 10eLa end part, 10eLb end part, 10a continuous body of absorbent main body, 10aew end part (part), 11 Absorber, 11c Absorbent core, 13 Top sheet (skin side sheet), 13 ew end, 13a Continuous sheet of top sheet, 13 aew end, 15 Back sheet (non-skin side sheet), 15 ew end, 15a Continuous sheet (second base sheet), 15 aew end, 15 f leakage prevention sheet, 15 n exterior sheet, 15 na exterior sheet continuous sheet, 30 belt member, 30 ew 1 end, 30 ew 2 end (part), 30 eLa end, 30 eLb End, 30a Continuous belt member, 30sa substrate sheet (first substrate sheet) 30sha base sheet, 30saew1 end, 30saew2 end (part), 31 non-woven fabric, 31a non-woven continuous sheet, 32 non-woven fabric, 32a non-woven continuous sheet, 30HL leg opening, 30HL1 opening, 30HL2 opening, 35 thread Elastic member, 35a continuum of thread-like elastic member, 40 reinforcing sheet, 40a continuous sheet of reinforcing sheet, L30 folding line, T end material, SL slit (leg opening), ja joint jb joint, A30 belt-like region, A30sa1 area, A30sa2 area, CLL10 approximately center position, CLL30 approximately center position, CLW10 center position, CLW30 center line,

Claims (10)

A method of manufacturing an absorbent article,
The absorbent article has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other in a state before completion, an absorbent main body that absorbs liquid, and a skin side in the thickness direction of the absorbent main body And a pair of belt members arranged side by side in the width direction,
The belt member has a leg opening;
Forming the leg-hole opening in a first base sheet continuous in the longitudinal direction for forming the belt member;
In the thickness direction of the second base material sheet, the first base material sheet in which the leg opening is formed is connected to a second base material sheet that is continuous in the longitudinal direction for forming the absorbent main body. While overlapping from the skin side, a portion of the first base material sheet that is located on the outer side in the width direction with respect to the opening around the leg is disposed on the second base sheet in a portion facing the portion. And overlapping and fixing from the skin side in the thickness direction of the material sheet ,
In forming the leg-hole opening, the leg-hole opening is formed so as to penetrate the first base sheet together with a reinforcing sheet that is superimposed and fixed on the first base sheet. ,
The reinforcing sheet is a sheet having elasticity in the longitudinal direction,
The method of manufacturing an absorbent article, wherein the reinforcing sheet is fixed to the first base sheet in a state of extending in the longitudinal direction. It is a manufacturing method of the absorptive article according to claim 1,
Based on the first base sheet, a plurality of the belt members have a continuous belt member continuous in the longitudinal direction,
In the fixing, the continuous body of the belt member is fixed to the second base material sheet. It is a manufacturing method of the absorptive article according to claim 1 or 2,
In the case where the first base sheet is divided into two regions in the width direction, in forming the leg opening, the leg opening is formed in one of the two regions. However, the leg opening is not formed in the other region,
A method for manufacturing an absorbent article, wherein a folding line for folding the first base sheet in the width direction does not exist in at least one of the regions. A method for producing an absorbent article according to any one of claims 1 to 3,
A method for manufacturing an absorbent article, wherein the first base sheet is not folded back in the width direction. It is a manufacturing method of an absorptive article in any one of Claims 1 thru / or 4,
In the fixing, an absorptivity characterized in that a continuous body of thread-like elastic members along the longitudinal direction is fixed in an extended state in the longitudinal direction in a predetermined region of the first base sheet. Article manufacturing method. It is a manufacturing method of the absorptive article in any one of Claims 1 thru | or 5, Comprising: In forming the said leg periphery opening part, the said reinforcement sheet has a continuous thread-like elastic member along the said longitudinal direction. A method for producing an absorbent article, wherein the body is overlapped and fixed in a state of being stretched in the longitudinal direction. A method for producing an absorbent article according to any one of claims 1 to 6 ,
The absorbent main body is disposed on the non-skin side of the absorbent core, the skin side sheet disposed on the skin side of the absorbent core in the thickness direction, and the absorbent core. A non-skin side sheet,
The method for producing an absorbent article, wherein the second base sheet is a continuous sheet in which the non-skin side sheet is continuous in the longitudinal direction. A method for producing an absorbent article according to any one of claims 1 to 6 ,
The absorbent main body is disposed on the non-skin side of the absorbent core, the skin side sheet disposed on the skin side of the absorbent core in the thickness direction, and the absorbent core. A non-skin side sheet,
The method for producing an absorbent article, wherein the second base sheet is a continuous sheet in which the skin side sheet is continuous in the longitudinal direction. A method for manufacturing an absorbent article according to any one of claims 1 to 8 ,
In forming the leg-hole opening, the leg-hole opening is formed in an asymmetric shape that is not line-symmetric with respect to a straight line along the longitudinal direction. An absorbent article manufacturing apparatus comprising:
The absorbent article has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other in a state before completion, an absorbent main body that absorbs liquid, and a skin side in the thickness direction of the absorbent main body And a pair of belt members arranged side by side in the width direction,
The belt member has a leg opening;
A forming device for forming the leg-hole openings in a first base sheet continuous in the longitudinal direction for forming the belt member;
In the thickness direction of the second base material sheet, the first base material sheet in which the leg opening is formed is connected to a second base material sheet that is continuous in the longitudinal direction for forming the absorbent main body. While overlapping from the skin side, a portion of the first base material sheet that is located on the outer side in the width direction with respect to the opening around the leg is disposed on the second base sheet in a portion facing the portion. A fixing device that overlaps and fixes from the skin side in the thickness direction of the material sheet ,
The forming device for forming the leg-hole opening portion forms the leg-hole opening portion so as to penetrate the first base material sheet together with a reinforcing sheet that is superimposed and fixed on the first base material sheet. ,
The reinforcing sheet is a sheet having elasticity in the longitudinal direction,
The said reinforcement sheet is being fixed to the said 1st base material sheet in the state extended | stretched in the said longitudinal direction, The manufacturing apparatus of the absorbent article characterized by the above-mentioned.

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