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WO2018167836A1 - Procédé de production et dispositif de production pour élément en feuille utilisé dans des articles absorbants - Google Patents

Procédé de production et dispositif de production pour élément en feuille utilisé dans des articles absorbants Download PDF

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Publication number
WO2018167836A1
WO2018167836A1 PCT/JP2017/010138 JP2017010138W WO2018167836A1 WO 2018167836 A1 WO2018167836 A1 WO 2018167836A1 JP 2017010138 W JP2017010138 W JP 2017010138W WO 2018167836 A1 WO2018167836 A1 WO 2018167836A1
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WO
WIPO (PCT)
Prior art keywords
sheet
elastic member
region
continuous
outer peripheral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/010138
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English (en)
Japanese (ja)
Inventor
二宮　彰秀
正治 冨岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unicharm Corp
Original Assignee
Unicharm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to JP2017565858A priority Critical patent/JP6975645B2/ja
Priority to PCT/JP2017/010138 priority patent/WO2018167836A1/fr
Publication of WO2018167836A1 publication Critical patent/WO2018167836A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators

Definitions

  • the present invention relates to a method for manufacturing a sheet-like member and an apparatus for manufacturing absorbent articles such as disposable diapers.
  • a sheet-like member 30 ′ in the form of a sheet as shown on the left side of the schematic plan view of FIG. 1A is used. That is, a single sheet-like sheet-like member 30 ′ having high stretch regions AH ′ and AH ′ having higher stretchability than the low stretch region AL ′ is used at both lateral positions of the low stretch region AL ′. Is done. And this sheet-like member 30 'is produced
  • the base material sheet continuous body 34a 'relating to the sheet-like member 30' is conveyed in the same direction as the conveying direction while continuing in the lateral direction.
  • an elastic member continuum 35a' that is continuous in the transport direction is arranged in the same direction.
  • the elastic member continuum 35a ′ is bonded to the base sheet continuum 34a ′ in a region AH1 ′ corresponding to the high stretchable region AH ′ (hereinafter also referred to as a high stretchable region AH1 ′).
  • it is fixed with an agent, it is not fixed with an adhesive in an area AL1 ′ corresponding to the low expansion / contraction area AL ′ (hereinafter also referred to as a low expansion / contraction corresponding area AL1 ′).
  • the elastic member continuum 35a ′ is cut with a cutter blade (not shown) at a predetermined position PC1 ′ in the conveying direction in the low expansion / contraction corresponding area AL1 ′, and thereby downstream of the predetermined position PC1 ′.
  • the intermediate member 35m ′ of the elastic member is cut off and generated at the position, and a new downstream end portion 35aed ′ of the elastic member continuum 35a ′ is generated upstream of the predetermined position PC1 ′.
  • the upstream end portion 35meu ′ of the former elastic member intermediate body 35m ′ contracts toward the high expansion / contraction corresponding region AH1 ′ located on the downstream side, and the latter elastic member continuum 35a.
  • the elastic member is not present in the low expansion / contraction corresponding area AL1 ', and as a result, the low expansion / contraction area AL' is formed in the area AL1 '.
  • the base material sheet continuous body 34a 'and the elastic member intermediate body 35m' are cut at the cutting target position PC 'between the high-stretchable corresponding regions AH1' and AH1 'adjacent to each other in the transport direction.
  • the sheet-like member 30 in the form of a single sheet having the high stretch regions AH ′ and AH ′ on both sides of the low stretch region AL ′ as described above. 'Is generated.
  • a plurality of joint portions j ′ for joining a pair of opposing surfaces are formed at intervals in the transport direction.
  • the joint portions j ′ are continuously formed in the CD direction intersecting the transport direction. Formed on both sides of the body 35a '.
  • the sheet-like member 30 ′ having the high stretch regions AH ′ and AH ′ and the low stretch region AL ′ is flexible and the stretchability of the elastic member 35 ′ is inhibited. Can be generated as not.
  • the positions where the joints j ′ and j ′ are formed in the continuous body 34a ′ of the base sheet and the position of the cutter blade that cuts the continuous body 35a ′ of the elastic member are elastic. If the member is deviated from an appropriate position with respect to the continuous body 35a ′, the sheet-like member 30 ′ as described above cannot be generated.
  • the continuous body 34a ′ is wound around the outer peripheral surface of a rotating body (not shown) that rotates along the conveyance direction of the continuous body 34a ′ of the base sheet, and the joint j is attached to the outer peripheral surface.
  • both a convex part (not shown) for compression formation and the cutter blade for cutting the continuous member 34 ′ of the elastic member are provided, both of these positions can be easily set to appropriate positions. Conceivable. That is, if these convex portions and the cutter blade are provided in advance so as to have an appropriate relative positional relationship, when at least one position is an appropriate position with respect to the continuum 35a ′ of the elastic member, The other position is inevitably an appropriate position. And it can also suppress that a cutter blade fails to cut
  • the present invention has been made in view of the conventional problems as described above, and the object thereof is to prevent the joining portion from damaging the elastic member from being pressed in the CD direction, and the cutter blade of the elastic member. It is also to suppress the failure to cut the continuum.
  • the main invention for achieving the above object is: A method of manufacturing a sheet-like sheet-like member having high stretch regions each having higher stretchability in the predetermined direction than the low stretch region at positions on both sides in a predetermined direction of the low stretch region, An elastic member that continues in the transport direction between a pair of facing surfaces facing each other in a continuous body of the base sheet related to the sheet-like member that is transported with the predetermined direction as the transport direction while continuing in the predetermined direction.
  • a joining portion forming step a joining portion that joins the pair of facing surfaces to each other by the convex portion provided on the outer peripheral surface of the rotating body corresponds to the high stretchable region in the continuous body of the base sheet.
  • a plurality of gaps are formed in the conveyance direction, and the joint portions are respectively formed at positions on both sides of the continuum of the elastic member in the CD direction intersecting the conveyance direction.
  • the cutting step in the region corresponding to the low expansion / contraction region of the continuous body of the base sheet, the continuous body of the elastic member is cut by a cutter blade provided on the outer peripheral surface of the rotating body, Generate an elastic member intermediate corresponding to the high stretch region,
  • an elastic member to be attached to the base sheet is generated by cutting the intermediate body of the elastic member at the position to be cut, and after the generation step, while contracting in the transport direction.
  • the elastic member expanded in the CD direction is attached to the base material sheet by being pressed in the CD direction at the joint portions on both sides in the CD direction and attached to the base sheet. It is a manufacturing method of a sheet-like member. Also, A sheet-form sheet-like member manufacturing apparatus having high stretch regions having higher stretchability in the predetermined direction than the low stretch region at positions on both sides in a predetermined direction of the low stretch region, An elastic member that continues in the transport direction between a pair of facing surfaces facing each other in a continuous body of the base sheet related to the sheet-like member that is transported with the predetermined direction as the transport direction while continuing in the predetermined direction.
  • An arrangement device that arranges the continuous body in a state of extending in the transport direction;
  • a wrapping and conveying device that wraps and conveys the continuum of the base sheet on which the continuum of the elastic member is disposed, around an outer peripheral surface of a rotating body that rotates along the conveying direction;
  • a generating device for generating a material sheet In the winding and conveying apparatus, a joining portion forming step and a cutting step are performed, In the joining portion forming step, a joining portion that joins the pair of facing surfaces to each other by the convex portion provided on the outer peripheral surface of the rotating body corresponds to the high stretchable region in the continuous body of the base sheet. In the region to be formed, a plurality of gaps are formed in the conveyance direction, and the joint portions are respectively formed at positions on both sides of the continuum of the elastic member in the CD direction intersecting the conveyance direction.
  • the continuous body of the elastic member is cut by a cutter blade provided on the outer peripheral surface of the rotating body, Generate an elastic member intermediate corresponding to the high stretch region,
  • the intermediate member of the elastic member is also cut at the position to be cut, thereby generating an elastic member to be attached to the base sheet, and on the downstream side in the transport direction from the generating device,
  • the elastic member that expands in the CD direction while contracting in the conveying direction is attached to the base sheet by being pressed in the CD direction between the joint portions on both sides in the CD direction. It is a manufacturing apparatus of the sheet-like member which concerns on the absorbent article to do.
  • the present invention it is possible to suppress the joint portion from failing to pinch the elastic member from the CD direction and to prevent the cutter blade from cutting the elastic member continuously.
  • FIG. It is a schematic perspective view of the 3 piece type diaper 1 as an example of an absorbent article. It is the schematic plan view which looked at the diaper 1 of the unfolding state from the wearer's skin side.
  • FIG. 4 is a cross-sectional view taken along the line IVa-IVa and a cross-sectional view taken along the line IVb-IVb in FIG.
  • FIG. 6A and 6B are explanatory views of the attaching function of the rubber thread 35 (45) played by the welded portion j.
  • 7A to 7C are explanatory diagrams of a method of forming the stretchable areas AH and AH on both lateral sides of the non-stretchable area AL while forming the nonstretchable area AL on the ventral belt member 31 (45).
  • FIG. 10B is a schematic enlarged view taken along line BB in FIG. 10A. It is a schematic plan view which expand
  • FIG. 14A is an explanatory diagram of a preferable arrangement position of the cutter blade 61ac in the non-convex area AN61at
  • FIG. 14B is an explanatory diagram of a preferable position of the cutting position PC1 in the non-stretchable area AL1. It is explanatory drawing at the time of forming the 2nd welding part j2 in non-stretching corresponding
  • a joining portion forming step a joining portion that joins the pair of facing surfaces to each other by the convex portion provided on the outer peripheral surface of the rotating body corresponds to the high stretchable region in the continuous body of the base sheet.
  • a plurality of gaps are formed in the conveyance direction, and the joint portions are respectively formed at positions on both sides of the continuum of the elastic member in the CD direction intersecting the conveyance direction.
  • the cutting step in the region corresponding to the low expansion / contraction region of the continuous body of the base sheet, the continuous body of the elastic member is cut by a cutter blade provided on the outer peripheral surface of the rotating body, Generate an elastic member intermediate corresponding to the high stretch region,
  • an elastic member to be attached to the base sheet is generated by cutting the intermediate body of the elastic member at the position to be cut, and after the generation step, while contracting in the transport direction.
  • the elastic member expanded in the CD direction is attached to the base material sheet by being pressed in the CD direction at the joint portions on both sides in the CD direction and attached to the base sheet. It is a manufacturing method of a sheet-like member.
  • the convex portion relating to the formation of the joint portion and the cutter blade relating to cutting the continuous body of the elastic member are the outer peripheral surface of the rotating body. Is provided. Therefore, by providing these convex portions and the cutter blade in advance at the prescribed appropriate positions on the outer peripheral surface, it is appropriate that the elastic member is clamped from both sides in the CD direction after the above generation step. It becomes easy to form the said joint part in a position, and also becomes easy to perform about the cutting
  • a method for producing a sheet-like member according to such an absorbent article At a predetermined position in the rotation direction of the rotating body, a position for performing both the joint forming step and the cutting step is set. In the region corresponding to the low expansion / contraction region, the cutting position where the cutter blade cuts the continuum of the elastic member is upstream of the transport direction in the transport direction in the region corresponding to the low expansion / contraction region. It is desirable to be located.
  • the cutting position at which the elastic member continuous body is cut by the cutter blade is upstream of the center position in the conveyance direction in the region corresponding to the stretchable region. Located on the side. Therefore, as compared with the case where the cutting position is located downstream of the central position, the cutting position immediately corresponds to the high expansion / contraction region located upstream of the cutting position after cutting the continuous member of the elastic member.
  • the junction can be formed in the region. And the said junction part is provided in the both sides of the CD direction of the continuous body of an elastic member.
  • the downstream end portion of the continuous member of the elastic member that is positioned upstream from the cutting position and contracts upstream can be immediately clamped by the joint and attached to the base material sheet continuous member. . And this suppresses the malfunction which may occur when the time from this cutting to the formation of the joint portion is long, that is, the malfunction that the relaxation of the stretched state of the continuum of the elastic member is greatly propagated upstream. be able to. As a result, even after the elastic member continuous body is cut, it is easy to maintain the stretched state of the elastic member continuous body upstream of the cutting position at substantially the same level as the stretched state before cutting. .
  • a method for producing a sheet-like member according to such an absorbent article The cutter blade is disposed on the outer peripheral surface of the rotating body so as to correspond to only one position in the transport direction in a region corresponding to the low expansion / contraction region per one continuous member of the elastic member. desirable.
  • the cutter blade is formed on the rotating body so as to correspond to only one position in the transport direction in the region per continuous body of one elastic member. It is arranged on the outer peripheral surface. Therefore, a failure that may occur when the cutter blade is arranged corresponding to a plurality of positions in the conveying direction for one elastic member continuum, that is, damage to the continuum of the base sheet due to the cutting of the cutter blade. It is possible to suppress the problem that the degree is increased.
  • the cutter blade is preferably disposed on the outer peripheral surface of the rotating body so as to correspond to a plurality of positions in the transport direction in a region corresponding to the low expansion / contraction region for one continuous member of the elastic member. .
  • the cutter blade has an outer periphery of the rotating body so as to correspond to a plurality of positions in the conveyance direction in the region for one continuous elastic member. Arranged on the surface. Therefore, even when it fails to cut the continuum of elastic members with one cutter blade, the continuum of elastic members can be cut with another cutter blade. And thereby, the continuous body of an elastic member can be cut
  • a method for producing a sheet-like member according to such an absorbent article A position for performing the cutting step is set at a predetermined position in the rotation direction of the rotating body, It is desirable that the pressing roll that presses the continuous body of the base sheet wound around the outer peripheral surface of the rotating body toward the outer peripheral surface is disposed at a position upstream of the predetermined position in the rotation direction. .
  • the downstream end of the continuous member of the elastic member is newly provided upstream of the cutting position. Formed.
  • the said downstream side edge part can shrink
  • contraction to the upstream side of the said downstream side edge part can be suppressed by the pressing. As a result, it is possible to prevent the downstream end from moving far beyond the boundary position between the region corresponding to the low expansion / contraction region and the region corresponding to the high expansion / contraction region to the upstream side.
  • the above-mentioned pressing also increases the sliding resistance between the pair of opposing surfaces of the base material sheet continuum and the elastic member continuum. Therefore, this also contributes to the suppression of the movement of the downstream end.
  • a method for producing a sheet-like member according to such an absorbent article When the joint is a first joint, In the joining portion forming step, it is desirable to form a second joining portion that joins the pair of facing surfaces in a region corresponding to the low expansion / contraction region by the second convex portion of the outer peripheral surface of the rotating body. .
  • the second joint portion that joins the pair of facing surfaces is also formed in the region corresponding to the low expansion / contraction region. Therefore, it can suppress that a pair of said opposing surface leaves
  • the sheet-like member can be integrated, and as a result, the strength of the sheet-like member can be improved.
  • the second joining portion is formed on the upstream side in the transport direction from the cutting position where the cutter blade cuts the continuous body of the elastic member in the region corresponding to the low expansion / contraction region.
  • Forming the second joints at positions on both sides of the elastic member continuous body in the CD direction The size of the interval in the CD direction between the second joint portions on the both sides is larger than the size of the interval in the CD direction between the first joint portions on the both sides, and the elastic member.
  • the size in the CD direction of the continuum of the elastic member in an unloaded state where no external force is applied to the continuum is desirable.
  • the downstream end portion of the elastic member continuous body located upstream of the cutting position is While guiding toward one joint, it is possible to prevent the downstream end from moving to the upstream side beyond the first joint and becoming unable to be pinched between the first joints. . Details are as follows. First, after cutting the continuous member of the elastic member with the cutter blade, a downstream end of the continuous member of the elastic member is newly formed on the upstream side of the cutting position. Then, the downstream end portion contracts to the upstream side, and at this time, the second joint portions have the above-mentioned distance between the CD directions.
  • an appropriate sliding force acts on the downstream end portion of the continuum of elastic members contracting to the upstream side from the second joint portions, thereby reducing the momentum of contraction to the upstream side. . And it becomes possible to suppress that the said downstream side edge part respectively moves to an upstream side exceeding a 1st junction part by this.
  • a method for producing a sheet-like member according to such an absorbent article At a predetermined position in the rotation direction of the rotating body, a position for performing both the joint forming step and the cutting step is set.
  • the predetermined position is provided with a horn that ultrasonically vibrates toward the outer peripheral surface of the rotating body, When the convex portion of the outer peripheral surface of the rotating body passes through the predetermined position, the joint portion is formed by pinching the horn and the convex portion, and the outer peripheral surface of the rotating body is When the cutter blade passes through the predetermined position, it is desirable to cut the continuous member of the elastic member by sandwiching pressure between the horn and the cutter blade.
  • the above-described joint portion can be formed by ultrasonic welding, and the above-described elastic member continuous body can be cut by an ultrasonic cutter. Can be done. Therefore, the formation process of a junction part and the cutting process of the continuous body of an elastic member can be performed reliably.
  • a sheet-form sheet-like member manufacturing apparatus having high stretch regions having higher stretchability in the predetermined direction than the low stretch region at positions on both sides in a predetermined direction of the low stretch region, An elastic member that continues in the transport direction between a pair of facing surfaces facing each other in a continuous body of the base sheet related to the sheet-like member that is transported with the predetermined direction as the transport direction while continuing in the predetermined direction.
  • An arrangement device that arranges the continuous body in a state of extending in the transport direction;
  • a wrapping and conveying device that wraps and conveys the continuum of the base sheet on which the continuum of the elastic member is disposed, around an outer peripheral surface of a rotating body that rotates along the conveying direction;
  • a generating device for generating a material sheet In the winding and conveying apparatus, a joining portion forming step and a cutting step are performed, In the joining portion forming step, a joining portion that joins the pair of facing surfaces to each other by the convex portion provided on the outer peripheral surface of the rotating body corresponds to the high stretchable region in the continuous body of the base sheet. In the region to be formed, a plurality of gaps are formed in the conveyance direction, and the joint portions are respectively formed at positions on both sides of the continuum of the elastic member in the CD direction intersecting the conveyance direction.
  • the continuous body of the elastic member is cut by a cutter blade provided on the outer peripheral surface of the rotating body, Generate an elastic member intermediate corresponding to the high stretch region,
  • the intermediate member of the elastic member is also cut at the position to be cut, thereby generating an elastic member to be attached to the base sheet, and on the downstream side in the transport direction from the generating device,
  • the elastic member that expands in the CD direction while contracting in the conveying direction is attached to the base sheet by being pressed in the CD direction between the joint portions on both sides in the CD direction. It is a manufacturing apparatus of the sheet-like member which concerns on the absorbent article to do.
  • FIG. 2 is a schematic perspective view of a three-piece type diaper 1 as an example of the diaper 1.
  • the diaper 1 has a “longitudinal direction”, a “lateral direction” orthogonal to the vertical direction, and a “front-rear direction” orthogonal to the vertical direction and the horizontal direction in a pants-type state before wearing as shown in FIG. Have. And while wearing the diaper 1, the vertical direction often faces the vertical direction. Therefore, hereinafter, the vertical direction is also referred to as “vertical direction”.
  • corresponds to a wearer's waistline side
  • corresponds to a wearer's belly side
  • corresponds to a wearer's back side
  • corresponds to a wearer's left side
  • corresponds to a wearer's right side.
  • the diaper 1 is positioned in the longitudinal direction in cooperation with the ventral band member 31 along the lateral direction and the ventral band member 31 while being positioned on the rear side of the ventral band member 31.
  • the absorptive main body 10 protrudes and is located below the abdominal side band member 31 and the back side band member 41 in the vertical direction.
  • the lateral end portions 31e, 31e of the ventral side band member 31 and the lateral end portions 41e, 41e of the corresponding back side band member 41 are joined by a side seal portion SS.
  • the ventral band member 31 and the dorsal band member 41 jointly form the leg openings LH and LH on the lower side and the lateral sides, respectively, together with the absorbent main body 10.
  • FIG. 3 is a schematic plan view of the unfolded diaper 1 as seen from the skin side of the wearer. 4 is a sectional view taken along the line IVa-IVa in FIG. 3, and is a sectional view taken along the line IVb-IVb in FIG.
  • the unfolded state means that the ventral belt member 31 and the back belt member 41 are separated by unbonding the aforementioned side seal portions SS that the diaper 1 in the pant-type state of FIG. 2 has on both sides in the lateral direction. And it is the state which developed the diaper 1 on the plane by opening the diaper 1 to the vertical direction.
  • the diaper 1 is shown in a virtual state in which each member constituting the diaper 1 has no elasticity.
  • the diaper 1 is provided with a plurality of elastic members 17, 18, 35, 45 for the purpose of imparting stretchability to the diaper 1.
  • the elastic member 17, The diaper 1 is shown in a virtual state in which there is no stretchability (contraction force) of 18, 35, 45.
  • the diaper 1 In the unfolded state, the diaper 1 has a longitudinal direction, a lateral direction, and a thickness direction (directions penetrating the paper surface in FIG. 3) as three directions orthogonal to each other.
  • the longitudinal direction is along the above-described longitudinal direction.
  • One side in the longitudinal direction corresponds to the ventral side, and the other side corresponds to the back side.
  • the outer side in the longitudinal direction corresponds to the upper side in the vertical direction
  • the inner side in the longitudinal direction corresponds to the lower side in the vertical direction. Since the longitudinal direction and the longitudinal direction are similar to each other as described above, hereinafter, for the convenience of explanation, even in this expanded state, the longitudinal direction may be used instead of the longitudinal direction. .
  • the lateral direction is synonymous with the lateral direction in the above-described pants-type state.
  • corresponds to the skin side which contact
  • the thickness direction is along the aforementioned front-rear direction.
  • the ventral band member 31 is disposed along the lateral direction, and the dorsal band member 41 is laterally spaced from the ventral band member 31 at a predetermined interval in the longitudinal direction. Arranged along the direction. And while the absorptive main body 10 is spanned along the longitudinal direction between these ventral
  • the diaper 1 is folded in two with the predetermined position CL1 in the longitudinal direction (the central position CL1 of the diaper 1 in the longitudinal direction) in the absorbent main body 10 being opposed to each other in the folded state.
  • the band members 31 and 41 are connected in an annular shape, thereby, as shown in FIG.
  • the pants-type diaper 1 is formed with a waist opening BH and a pair of leg openings LH and LH.
  • the absorptive main body 10 has a substantially rectangular shape in plan view in the developed state of FIG. And the longitudinal direction of the absorptive main body 10 is distribute
  • the absorbent body 11 has a liquid absorbent absorbent core 11c and a core wrap sheet (not shown) that covers the outer peripheral surface of the core 11c.
  • the absorptive core 11c is a molded body in which a liquid absorptive material such as pulp fiber or superabsorbent polymer is molded into a substantially hourglass shape in plan view as an example of a predetermined shape.
  • the core wrap sheet may be a liquid permeable sheet such as tissue paper or non-woven fabric, but the core wrap sheet may be omitted.
  • 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.
  • the top sheet 13 is a liquid-permeable flexible sheet such as a nonwoven fabric.
  • the back sheet 15 is a liquid-impermeable flexible sheet. And as an example of the back sheet 15, two layers having a liquid-impermeable leak-proof sheet such as a polyethylene film or a polypropylene film and a non-woven exterior sheet bonded to the non-skin side of the leak-proof sheet A laminate sheet 15 having a structure is exemplified.
  • At least the back sheet 15 is a flat sheet that protrudes from the absorbent body 11 in the longitudinal direction and the lateral direction.
  • the leg gather LG which each expands-contracts in a longitudinal direction is formed in the part protruded in the horizontal direction. That is, the rubber thread 17 along the longitudinal direction as an elastic member is fixed to the protruding portion in a state of extending in the longitudinal direction, thereby forming a stretchable leg gather LG at the portion. .
  • the absorptive main body 10 has the solid gathers LSG and LSG as a leak-proof wall part in each edge part of a horizontal direction in order to prevent a side leak. That is, a configuration in which the rubber thread 18 along the longitudinal direction is attached as an elastic member 18 to the sheet-like portion serving as the three-dimensional gather LSG is provided at each lateral end of the absorbent main body 10. It has been.
  • the ventral band member 31 is a sheet-like member having a substantially rectangular shape in plan view made of two nonwoven fabrics 32 and 33. That is, as shown in FIG. 4, the two nonwoven fabrics 32, 33 are in a state of being overlapped with each other in the thickness direction, and a pair of facing surfaces facing each other are as shown in FIG. 5 described later.
  • the ventral band member 31 is arranged so as to protrude on both sides in the lateral direction from the absorbent main body 10, while the non-skin is formed on the ventral end 10 ea of the absorbent main body 10. It is overlapped and joined from the side.
  • the back belt member 41 is a sheet-like member having a substantially rectangular shape in plan view using two nonwoven fabrics 42 and 43 as materials. That is, as shown in FIG. 4, the two nonwoven fabrics 42 and 43 are in a state where they are overlapped with each other in the thickness direction, and a pair of opposing surfaces facing each other is the ventral band member 31 of FIG. 5.
  • a plurality of welds j, j... Corresponding to joints) discretely arranged in the vertical direction (longitudinal direction) and the horizontal direction are joined.
  • the back band member 41 is arranged so as to protrude on both sides in the lateral direction from the absorbent main body 10, while the non-skin is formed on the back end 10 eb of the absorbent main body 10. It is overlapped and joined from the side.
  • a spunbond nonwoven fabric is used for both of the two nonwoven fabrics 32 and 33 (42 and 43) related to the ventral belt member 31 (41).
  • SMS spunbond / meltblown / spunbond
  • a single fiber of polypropylene (PP) which is a representative example of a thermoplastic resin
  • PP polypropylene
  • the present invention is not limited to this.
  • a single fiber of other thermoplastic resin such as polyethylene (PE) may be used, or a composite fiber having a sheath core structure such as PE or PP may be used.
  • FIG. 5 is a schematic plan view of the ventral belt member 31 in the unfolded state as viewed from the non-skin side.
  • the side seal portions SS described above are provided at the lateral end portions 31e and 31e (41e and 41e) of the ventral belt member 31 (41), respectively.
  • the side seal portion SS has a plurality of welded portions SSk, SSk,... Having the same shape and arranged in a straight line along the vertical direction.
  • each welding part SSk welds the nonwoven fabric 33 of the ventral
  • FIGS. 6A and 6B are explanatory diagrams of the latter function performed by the welded portion j, that is, the attaching function of the thread rubber 35 (45), and are schematic enlarged views of the VI portion in FIG.
  • the welded portions j, j... Are provided for each of the rubber thread 35 (45) arranged along the lateral direction.
  • the welded portions j are formed so as to be paired on both sides in the longitudinal direction of the corresponding rubber thread 35, that is, a pair of welded portions j, j arranged on both sides in the longitudinal direction are welded portion pairs jP. I am doing.
  • a plurality of pairs of the welded portion pairs jP are formed side by side in the lateral direction with a gap between the welded portion pairs jP adjacent in the lateral direction.
  • the pair of welded portions j, j forming the welded portion pair jP are arranged with a distance Dj in the vertical direction.
  • the size of the distance Dj is: It is set to the same dimension as or slightly larger than the vertical dimension D35t (D45t) of the rubber thread 35 (45) in the state of being expanded in the lateral direction to the target value of the expansion ratio.
  • the rubber thread 35 (45) is relaxed from the extended state of the above-described extension magnification. Therefore, in the same pants-type state, as shown in FIG. 6B, the rubber thread 35 (45) is going to expand in the vertical direction while contracting in the horizontal direction, but here, based on the magnitude relationship of the above dimensions.
  • the longitudinal expansion of the rubber thread 35 (45) is restricted to the pair of welded portions j and j.
  • the rubber thread 35 (45) is substantially clamped in the longitudinal direction between the welded portions j and j, and as a result, the rubber thread 35 (45) is in the ventral region. It is in the state attached to the two nonwoven fabrics 32 and 33 (42, 43) which concern on the member 31 (41).
  • the target value of the above-described expansion magnification is selected from, for example, 1.5 to 4.0 times.
  • examples of the fineness of the rubber thread 35 (45) include 400 dtex to 1000 dtex.
  • the ventral band member 31 (41) has a region AL in which the rubber thread 35 is not provided at the central portion in the horizontal direction and at the lower portion in the vertical direction. And since the thread rubber 35 is not provided in the area AL, the stretchability in the lateral direction is not given.
  • the area AL where the thread rubber 35 is not provided is also referred to as “non-stretchable area AL”, and the area where the thread rubber 35 is provided is also referred to as “stretchable area AH”.
  • the former non-stretchable area AL corresponds to the “low stretchable area” in the claims
  • the latter stretchable area AH corresponds to the “highly stretchable area” in the claims.
  • expansion / contraction regions AH and AH are respectively provided on both sides of the non-expansion / contraction region AL in the lower part of the ventral band member 31, while the expansion / contraction region is provided on the upper part of the band member 31.
  • AH is provided over substantially the entire length in the lateral direction.
  • the edge part 10ea of the longitudinal direction in the absorptive main body 10 has overlapped with this non-stretchable area
  • FIG. 7A to 7C are explanatory diagrams of a method of forming the stretchable areas AH and AH on both sides in the lateral direction of the non-stretchable area AL while forming the nonstretchable area AL on the ventral belt member 31 (45).
  • the rubber thread 35 (45) over the substantially entire length in the lateral direction is placed between the two nonwoven fabrics 32, 33 (42, 43) of the ventral belt member 31 (45) in the lateral direction. Placed in a stretched state.
  • FIG. 7B the plurality of welded portion pairs jP, jP...
  • the non-stretchable corresponding area AL1 does not have the welded portion pair jP, the end 35en (45en) of the rubber thread 35 (45) does not stay in the area AL1, and the end 35en (45en) Then, it contracts toward the expansion / contraction corresponding area AH1 in the lateral direction.
  • the non-stretchable region AL1 has no rubber thread 35 (45), and as a result, the non-stretchable region to which the stretchability is not imparted is formed. AL is formed.
  • a welded part pair jP is formed in the expansion / contraction corresponding area AH1.
  • the end 35en (45en) of the rubber thread 35 (45) expands in the vertical direction while moving in the horizontal direction along with the contraction in the horizontal direction. Therefore, when the end portion 35en (45en) passes through the position of the welded portion pair jP closest to the non-stretchable corresponding region AL1 in the stretchable corresponding region AH1, the same end portion 35en expanded in the vertical direction. (45en) is sandwiched between the welded portions j and j of the welded portion pair jP, and thus the end portion 35en (45en) is attached to the nonwoven fabrics 32 and 33 (43 and 43). .
  • the thread rubber 35 (45) is contracted in the lateral direction over the entire length of the thread rubber 35 (45). Magnify in the direction. Then, even in all the remaining welded portion pairs jP, jP... In the expansion / contraction corresponding area AH1, the welded portions j, j clamp the thread rubber 35 (45) in the vertical direction. As a result, the thread rubber 35 (45) is attached to the non-woven fabrics 32 and 33 (42 and 43) in the stretchable region AH1, and as a result, stretchability is imparted to the region AH1. A stretchable area AH is formed.
  • FIG. 8 is a schematic plan view showing a partial perspective view of how the diaper 1 is manufactured in the same line.
  • 9A and 9B are a schematic enlarged view of part A and a schematic enlarged view of part B in FIG. 8, respectively.
  • FIG. 9B not the continuous sheets 32 a and 33 a related to the ventral band member 31 but the continuous sheets 42 a and 43 a related to the back side band member 41 should be visible.
  • the description will be made assuming that the continuous sheets 32a and 33a related to the ventral belt member 31 are visible.
  • two non-woven fabrics 32 and 33 related to the ventral belt member 31 (corresponding to a sheet-like member) are continuous sheets 32a and 33a (base material sheets) that are continuous in the conveying direction, respectively.
  • the two nonwoven fabrics 42 and 43 (corresponding to the base material sheet) related to the back belt member 41 (corresponding to the sheet-like member) are also continuous in the transporting direction, respectively.
  • the continuous sheets 42a and 43a (corresponding to a continuous base material sheet) are conveyed.
  • the processing corresponding to the processing positions PK1, PK2,. Is performed on each of the two continuous sheets 32a, 33a, 42a, 43a.
  • CD direction when the direction orthogonal to both the thickness direction and the conveying direction of the continuous sheets 32a, 33a, 42a, 43a is defined as “CD direction”, in this example, two continuous sheets each. 32a, 33a, 42a, 43a, that is, the two continuous sheets 32a, 33a related to the ventral band member 31 and the two continuous sheets 42a, 43a related to the back side band member 41 are conveyed side by side in the CD direction. Has been. However, it is not limited to this.
  • the first machining position PK1 to the sixth machining position PK6 are set in this order from upstream to downstream in the transport direction.
  • the processing at each processing position PK1, PK2,... Is for the two continuous sheets 32a, 33a related to the ventral band member 31, and for the two continuous sheets 42a, 43a related to the back side band member 41. And are generally the same as each other.
  • the conveyance of the two continuous sheets 32a and 33a (42a and 43a) relating to each band member 31 (41) is performed in a so-called lateral flow form. That is, the two continuous sheets 32a and 33a (42a and 43a) are conveyed in a posture in which the direction corresponding to the lateral direction of the diaper 1 faces the conveying direction. Therefore, in the two continuous sheets 32a and 33a (42a and 43a), the boundary position PBL between the diapers 1 and 1 adjacent in the lateral direction is virtually set at the product pitch P1 in the transport direction. Then, at the sixth processing position PK6 located at the end of the production line, by cutting the two continuous sheets 32a, 33a (42a, 43a) with the boundary position PBL as the cutting target position PC, Diaper 1 is generated.
  • conveyance of the two continuous sheets 32a and 33a (42a and 43a) related to each belt member 31 (41) is performed by an appropriate conveyance device (not shown) such as a belt conveyor or a conveyance roller. Therefore, unless otherwise specified, it is assumed that two continuous sheets 32a and 33a (42a and 43a) are conveyed in the conveying direction by these conveying devices.
  • a belt conveyor having an endless belt that circulates as a transport surface, a suction belt conveyor having an adsorption function on the outer peripheral surface of the endless belt, and the like can be given.
  • each of the continuous sheets 32a, 33a, 42a, 43a is very small and negligible compared to the stretchability of the thread rubbers 35, 45.
  • each continuous sheet 32a, 33a, 42a, 43a is conveyed in the state stretched
  • the manufacturing process of the diaper 1 will be described in detail.
  • the two continuous sheets 32a and 33a (42a and 43a) relating to each band member 31 (41) pass through the first processing position PK1.
  • the two continuous sheets 32a and 33a (42a and 43a) are overlapped with each other in the thickness direction.
  • the thread rubber continuum 35a (45a) is disposed on the pair of opposed surfaces 32ast, 33ast (42ast, 43ast) by an appropriate conveyance roller (not shown). This corresponds to the “placement device” in the section.
  • both of the two continuous sheets 32a and 33a related to the ventral band member 31 and the two continuous sheets 42a and 43a related to the back side band member 41 are not shown in FIGS. 8 and 9A, but are wound and conveyed.
  • the apparatus it is wound around the outer peripheral surface 61as of an anvil roll 61a of an ultrasonic welding apparatus 60 (FIG. 10) described later (corresponding to a winding conveyance process).
  • it passes through the second processing position PK2 located in the wound range R61a, and when passing, as shown in FIG. 9A, the two continuous sheets 32a, 33a (42a, 43a) are connected to each other.
  • the welded portion j is formed to be paired on both sides in the CD direction of the thread rubber continuous body 35a (45a). That is, as shown in FIG. 9A, a pair of welded portions j, j arranged on both sides in the CD direction of the continuum 35a (45a) form the welded portion pair jP. A plurality of pairs of the welded part pairs jP are formed side by side in the transport direction with a gap between the welded part pairs jP adjacent in the transport direction.
  • the one side portion in the CD direction of the continuous sheets 32 a and 33 a corresponds to the upper portion of the ventral belt member 31 of the diaper 1. Therefore, a plurality of pairs of welded portions jP, jP... Are formed side by side over the entire length in the transport direction on the one side portion.
  • the other side portion in the CD direction corresponds to the lower portion of the ventral belt member 31 of the diaper 1. Therefore, the other side portion includes two expansion / contraction corresponding regions AH1 and AH1 (corresponding to a region corresponding to a high expansion / contraction region in a continuous body of base material sheets) and one non-contraction / contraction corresponding region AL1 (base material sheet).
  • the rubber thread continuous body 35a (45a) is cut at a predetermined cutting position PC1 in the non-stretchable corresponding region AL1 (corresponding to a cutting step).
  • the non-stretchable region AL is formed in the non-stretchable corresponding region AL1 as described above. That is, first, by the above cutting, a new downstream end portion 35aen (45aen) of the thread rubber continuous body 35a (45a) is formed on the upstream side of the cutting position PC1, and the downstream side of the cutting position PC1.
  • a rubber thread intermediate body 35m (45m) (corresponding to an intermediate body of an elastic member) having a length corresponding to two expansion / contraction corresponding regions AH1 and AH1 adjacent in the transport direction is generated. Further, by the above cutting, the downstream end portion 35aen (45aen) of the former thread rubber continuum 35a (45a) is relaxed to the upstream side and contracted to the upstream side, and is generally positioned in the non-stretchable corresponding region AL1. On the other hand, the upstream end portion 35men (45men) of the latter thread rubber intermediate 35m (45m) is also relaxed in the same manner and contracted to the downstream side so that it is almost not positioned in the non-stretchable region AL1. As a result, a non-stretchable region AL is formed in the non-stretchable corresponding region AL1.
  • the expansion-corresponding region AH1 is located on the downstream side in the direction in which the upstream end portion 35men (45men) of the rubber thread intermediate body 35m (45m) contracts, but at this point, the region AH1 is The second machining position PK2 has already been passed. Therefore, welded part pairs jP, jP,... Are formed in the region AH1. Further, the upstream end 35men (45men) of the intermediate body 35m (45m) of the same rubber thread expands in the CD direction as it contracts to the downstream side. Therefore, the upstream end portion 35men (45men) is regulated so as to be sandwiched between the welded portions j and j of the welded portion pair jP so as not to contract further downstream.
  • the downstream end 35aen (45aen) of the thread rubber continuum 35a (45a) contracts to the upstream side, but the expansion / contraction corresponding region AH1 is also located on the upstream side.
  • the expansion / contraction corresponding area AH1 has not yet passed through the second processing position PK2 when the thread rubber continuous body 35a (45a) is cut. Therefore, the welded portion pair jP is not formed in the region AH1, but here, the downstream end portion 35aen (45aen) of the continuous thread rubber 35a (45a) is formed of the continuous sheets 32a and 33a (42a). 43a).
  • the continuous sheet 32a, 33a contracts to the upstream side relatively slowly by the sliding resistance received from each other.
  • the expansion / contraction corresponding area AH1 passes through the second processing position PK2, and as a result, a pair of welded portions is formed in the area AH1.
  • jP is formed.
  • the welded portion pair jP located on the most downstream side in the expansion / contraction corresponding area AH1 is formed.
  • downstream end portion 35aen (45aen) is sandwiched between the welded portions j and j of the welded portion pair jP based on the expansion due to the subsequent contraction, and thus does not contract further to the upstream side. To be regulated.
  • the formation of the welded portion j and the cutting of the thread rubber continuum 35a (45a) are performed by the ultrasonic welding apparatus 60. Details of the ultrasonic welding apparatus 60 will be described later.
  • both the two continuous sheets 32a and 33a related to the ventral belt member 31 and the two continuous sheets 42a and 43a related to the back belt member 41 pass through the third processing position PK3. To do. And in the case of the passage, it was formed in the two continuous sheets 42a and 43a concerning the non-expandable region AL and the back side belt member 41 formed in the two continuous sheets 32a and 33a related to the ventral side band member 31.
  • a single-sheet absorbent main body 10 generated in a separate process (not shown) is spanned and fixed between the non-stretchable region AL, and diapers 1h, 1h,.
  • a continuous substantially continuous diaper continuum 1hs is formed.
  • the absorptive main body 10 can be fixed using, for example, a rotating drum device (not shown).
  • the rotary drum device has, for example, a rotary drum that rotates along the conveying direction, and the rotary drum has a plurality of holding portions that detachably hold the absorbent main body 10 on the outer peripheral surface.
  • the continuous body 1hs of the substantially ladder-like diaper passes through the fourth processing position PK4.
  • the main body 10 is folded in half at a predetermined position CL1 in the CD direction of the absorbent main body 10, whereby two continuous sheets 32a and 33a and a back side band related to the ventral side band member 31 are obtained.
  • Two continuous sheets 42a and 43a related to the member 41 are stacked in the thickness direction.
  • Such folding can be performed using, for example, a bending guide device (not shown).
  • the bending guide device includes, for example, a guide plate and a guide roller disposed at a predetermined position in the transport direction. These guide plates and guide rollers guide the continuous body 1hs so that the continuous body 1hs of the substantially ladder-like diaper passing through the arrangement position thereof is folded in two.
  • the diaper continuum 1hsb in the folded state passes through the fifth processing position PK5.
  • dorsal band member 41 were piled up in the thickness direction.
  • a pair of side seal portions SS, SS are formed by welding at respective positions on both sides of the cutting target position PC, and thereby the diaper continuous body 1hsb is fixed in a folded state.
  • a continuous body 1s of a pant-type diaper is generated in which a plurality of pant-type diapers 1, 1,.
  • the side seal portion SS can be formed using, for example, a heat seal device (not shown).
  • the heat seal device has a pair of rolls that are heated while rotating in the transport direction, for example.
  • One roll is a heat embossing roll having a convex portion corresponding to each welded portion SSk of the side seal portion SS on the outer peripheral surface, and the other roll is an anvil roll that receives the convex portion on a smooth outer peripheral surface. .
  • the continuous body 1s of the pants-type diaper passes through the sixth processing position PK6. And in the case of the passage, the continuous body 1s is cut
  • the thread rubber continuous bodies 35a, 35a (45a, 45a ...) and the thread rubber intermediate bodies 35m, 35m (45m, 45m ...) disposed on the other side in the CD direction are respectively described above.
  • Cutting is performed at the cutting target position PC.
  • the thread rubber 35 (45) becomes the nonwoven fabric 32 of the band members 31 and 41 by the clamping pressure between the pair of welded portions j and j of the welded portion pair jP through the relaxation of the stretched state of the thread rubber 35 (45) caused thereby.
  • 33 (42, 43) as described above with reference to FIGS. 6A and 6B.
  • Such cutting can be performed using, for example, a cutter device (not shown) (corresponding to a generating device).
  • a cutter apparatus has a pair of roll which rotates along a conveyance direction, for example. And one roll is a cutter roll which has a cutter blade in an outer peripheral surface, and the other roll is an anvil roll which receives the said cutter blade in an outer peripheral surface.
  • the processing at the second processing position PK2 is substantially the same for the members 32a, 33a, and 35a associated with the ventral belt member 31 and for the members 42a, 43a, and 45a associated with the dorsal belt member 41. is there. Therefore, in the following, only the processing for the members 32a, 33a, and 35a related to the ventral band member 31 will be described on behalf of both of them, and the description of the dorsal band member 41 will be omitted.
  • FIG. 10A is an explanatory diagram of the processing performed at the second processing position PK2. That is, it is a schematic side view of the ultrasonic welding device 60 that constitutes the main device of the processing as viewed from the CD direction.
  • FIG. 10B is a schematic enlarged view taken along the line BB in FIG. 10A.
  • FIG. 11 is a schematic plan view showing an outer peripheral surface 61as of an anvil roll 61a, which will be described later, related to the apparatus 60 in a developed direction Dc61a.
  • a continuous rubber thread 35a stretched in the conveying direction up to the target value of the stretch magnification is inserted between the pair of opposing surfaces 32ast and 33ast.
  • the continuous sheets 32a and 33a are conveyed from the first processing position PK1. Therefore, a transport mechanism 51 that receives and transports the continuous sheets 32a and 33a sent from the first processing position PK1 is disposed immediately upstream of the second processing position PK2, and downstream in the transport direction.
  • An ultrasonic welding device 60 is provided.
  • the transport mechanism 51 includes, for example, a transport roller 51R that rotates about a rotation axis along the CD direction, and a servo motor (not shown) as a drive source that drives and rotates the transport roller 51R.
  • a transport roller 51R that rotates about a rotation axis along the CD direction
  • a servo motor (not shown) as a drive source that drives and rotates the transport roller 51R.
  • the transport roller 51R is driven and rotated along the transport direction, and sends the continuous sheets 32a and 33a in which the continuous thread rubber 35a is inserted toward the ultrasonic welding device 60.
  • the ultrasonic welding device 60 (corresponding to a winding and conveying device) includes an anvil roll 61a (corresponding to a rotating body) that rotates along the conveying direction, and a horn 61h that is disposed at a predetermined position P61h in the rotational direction Dc61a of the anvil roll 61a.
  • anvil roll 61a corresponding to a rotating body
  • a horn 61h that is disposed at a predetermined position P61h in the rotational direction Dc61a of the anvil roll 61a.
  • the anvil roll 61a is supported by an appropriate support member (not shown) such as a bearing so as to be rotatable around a rotation axis along the CD direction.
  • the roll 61a is driven to rotate by being applied with a driving force from a servo motor (not shown) as a driving source. Further, the continuous sheets 32a and 33a fed from the above-described transport roller 51R are wound around the roll 61a at a predetermined winding angle ⁇ 61a with almost no relative slip on the outer circumferential surface 61as of the roll 61a.
  • the wrapping angle ⁇ 61a is selected from a range of 20 ° to 270 °, for example, preferably 45 ° to 210 °, and more preferably 60 ° to 180 °.
  • the horn 61h is arranged at the predetermined position P61h in the winding range R61a in the rotation direction Dc61a of the anvil roll 61a.
  • the horn 61h is arranged at the downstream end P61h of the winding range R61a.
  • the predetermined position P61h is the same position as the second machining position PK2.
  • the horn 61h is also a roll supported by a support member (not shown) such as a bearing so as to be rotatable around a rotation axis along the CD direction, and applies a driving force from a servo motor (not shown) as a drive source. Rotating drive.
  • the horn 61h repeats expansion and contraction at a predetermined frequency in the rotational radius direction, so that the outer peripheral surface 61hs of the horn 61h functions as a vibration surface for ultrasonic vibration. And thereby, the outer peripheral surface 61hs vibrates in the direction which expands / contracts the space
  • the frequency of vibration is, for example, a predetermined value of 20 kHz to 35 kHz
  • the amplitude is, for example, a predetermined value of 1 micron to 30 microns.
  • the vibration surface 61hs is ultrasonically vibrated, thereby ultrasonically welding the pair of opposed surfaces 32ast and 33ast in the two continuous sheets 32a and 33a passing between the surface 61hs and the outer peripheral surface 61as. . That is, the above-mentioned welded portion j is formed on the two continuous sheets 32a and 33a.
  • the generation of the vibration is performed by inputting an electric signal having the above frequency into a piezo element of a converter (not shown) connected to the horn 61h.
  • the total length of the outer circumferential surface 61as of the roll 61a in the rotation direction Dc61a is substantially equivalent to the product pitch P1 described above. Therefore, in this ultrasonic welding apparatus 60, the welding portion j is formed so as to form the expansion / contraction region AH and the non-expansion / contraction region AL for one diaper for each rotation of the anvil roll 61a. Specifically, a portion on one side in the CD direction on the outer peripheral surface 61as of the anvil roll 61a shown in FIG. 11 is associated with the upper portion of the ventral belt member 31 in FIG. Therefore, the stretchable area AH1 in the continuous sheets 32a and 33a in FIG.
  • the horn Ultrasonic vibration energy is input from the vibration surface 61hs, which is the outer peripheral surface of 61h, to the above-described portion of the thread rubber continuum 35a via the continuous sheets 32a and 33a. It is cut at the cutting position PC1 in the area AL1 (corresponding to a cutting step).
  • the convex portion 61at related to the formation of the weld portion j and the cutter blade 61ac related to the cutting of the thread rubber continuous body 35a It is provided on the outer peripheral surface 61as of the same anvil roll 61a. Therefore, by providing the convex portion 61at and the cutter blade 61ac in advance at specified proper positions on the outer peripheral surface 61as, the thread rubber 35 is placed at a position downstream of the sixth processing position PK6. It is easy to form the welded portion j at an appropriate position to be clamped from both sides in the CD direction, and to cut the continuous thread rubber 35a. Thus, the cutter blade 61ac fails to cut the thread rubber continuum 35a while preventing the welded parts j, j of the welded part pair jP from squeezing the rubber thread 35 from the CD direction. Is also suppressed.
  • the arrangement position P61h of the horn 61h is included in the above-described winding range R61a of the continuous sheets 32a and 33a around the anvil roll 61a.
  • the continuous sheets 32a and 33a are wound around the upstream side in the rotational direction Dc61a with respect to the arrangement position P61h with a predetermined length.
  • the continuous thread rubber continuous body 35a can be pressed between the continuous sheets 32a and 33a from both sides in the thickness direction, thereby increasing the aforementioned sliding resistance that can occur between the continuous thread rubber continuous body 35a. be able to.
  • the upstream end of the downstream end portion 35aen of the thread rubber continuous body 35a which may occur when the thread rubber continuous body 35a is cut by the cutter blade 61ac, can be made slower. it can.
  • one cutter blade 61ac is disposed in each non-convex area AN61at for each thread rubber continuum 35a.
  • the cutter blade 61ac is arranged so as to correspond to only one position in the transport direction in the non-stretchable corresponding area AL1 per one continuous thread rubber 35a. Therefore, it becomes possible to suppress the damage degree of the continuous sheets 32a and 33a from being increased due to the cutting of the cutter blade 61ac. Details are as follows. For example, in the comparative example of FIG. 13, as can be seen in comparison with FIG.
  • the non-convex region AN61at of the outer peripheral surface 61as of the anvil roll 61a includes a plurality of thread rubber continuums 35a (example of FIG. 13).
  • three) cutter blades 61ac are arranged. That is, the cutter blade 61ac is arranged so as to correspond to a plurality of positions in the non-stretchable corresponding area AL1 in the transport direction for one continuous thread rubber 35a.
  • the cutter blades 61ac, 61ac,... Corresponding to a plurality of positions in the transport direction in the continuous sheets 32a, 33a will hit each other, thereby increasing the degree of damage to the continuous sheets 32a, 33a. End up.
  • the arrangement position of the cutter blade 61ac may be arranged upstream of the center position CAN61at in the rotation direction Dc61a in the non-convex area AN61at. That is, as shown in FIG. 14B, the cutting position PC1 at which the thread rubber continuous body 35a is cut by the cutter blade 61ac is preferably positioned upstream of the center position CAL1 in the transport direction in the non-stretchable region AL1. In this example, the cutting positions PC1, PC1,... Of all the cutter blades 61ac, 61ac... Are located upstream of the central position CAL1.
  • the welded portion j can be formed in the expansion / contraction corresponding area AH1 located at the position.
  • the welds j are provided on both sides of the thread rubber continuous body 35a in the CD direction. Therefore, the downstream end portion 35aen of the thread rubber continuous body 35a that is positioned upstream from the cutting position PC1 and contracts upstream is immediately sandwiched between the welded portions j and j, and the continuous sheet 32a, 33a can be attached.
  • the malfunction that can occur when the time from the cutting to the formation of the welded portion j is long that is, the malfunction that the relaxation of the stretched state of the thread rubber continuum 35a is greatly propagated upstream. Can be suppressed.
  • the stretched state of the thread rubber continuous body 35a located upstream from the cutting position PC1 is maintained at substantially the same level as the stretched state before cutting. It becomes easy to do.
  • a pressing roll 70 as virtually indicated by a two-dot chain line in FIG. That is, the pressing roll 70 that presses the continuous sheets 32a and 33a wound around the outer peripheral surface 61as of the anvil roll 61a toward the outer peripheral surface 61as is positioned upstream of the rotation position Dc61a of the anvil roll 61a from the arrangement position P61h of the horn 61h. It is good to place in.
  • downstream end 35aen can be prevented from moving far beyond the boundary position BL (FIG. 9A) between the non-stretchable corresponding area AL1 and the stretchable corresponding area AH1 upstream.
  • the pressing also increases the sliding resistance between the pair of opposed surfaces 32ast, 33ast of the continuous sheets 32a, 33a and the continuous thread rubber 35a. This also contributes effectively to the suppression of the movement of the downstream end portion 35aen.
  • first welded portion j1 (corresponding to the first joint portion) and “first welded portion pair jP1”, respectively.
  • second welded portion j2 (corresponding to the second joint portion) that joins the pair of opposed surfaces 32ast and 33ast in the continuous sheets 32a and 33a is provided also to the non-stretchable region AL1.
  • the nonwoven fabrics 32 and 33 of the ventral band member 31 can be integrated, and as a result, the strength of the ventral band member 31 can be improved.
  • this 2nd welding part j2 is realizable by providing the 2nd convex part not shown in the above-mentioned non-convex part area
  • the second welded portion j2 is positioned upstream in the transport direction from the cutting position PC1 where the thread rubber continuous body 35a is cut by the cutter blade 61ac in the non-stretchable area AL1.
  • the second welds j2 are formed at positions on both sides of the thread rubber continuous body 35a in the CD direction.
  • the 2nd welding part j2, j2 located in the both sides of the said CD direction is called "the 2nd welding part pair jP2," a plurality of said 2nd welding part pairs jP2 are provided in a conveyance direction.
  • the size of the distance Dj2 in the CD direction between the second welded portions j2 and j2 forming the second welded portion pair jP2 is set to the size of the welded portions j1 and j1 forming the first welded portion pair jP1.
  • the size is set to be larger than the distance Dj in the CD direction between them, and to be equal to or less than the size in the CD direction of the continuous thread rubber 35a in an unloaded state where no external force is applied to the continuous thread rubber 35a. Then, after the thread rubber continuous body 35a is cut at the cutting position PC1, the downstream end portion 35aen of the rubber thread continuous body 35a located upstream from the cutting position PC1 is changed to the first position.
  • the downstream end portion 35aen moves upstream beyond the first welded portion j1, and the first welded portions j1 and j1 fail to pinch each other. It becomes possible to suppress. Details are as follows. First, after the thread rubber continuous body 35a is cut by the cutter blade 61ac, the downstream end portion 35aen of the thread rubber continuous body 35a is newly formed on the upstream side of the cutting position PC1 as described above. . Then, the downstream end portion 35aen contracts to the upstream side. At this time, the second welded portions j2 and j2 have the distance Dj2 having the above size between the CD directions. .
  • a configuration having two continuous sheets 32a and 33a is illustrated as an example of a continuous body of base sheets, but this is not a limitation.
  • the continuous body sheet may be a single continuous sheet.
  • a pair of opposing surfaces are formed by folding the one continuous sheet at a predetermined position in the CD direction, and a thread rubber continuum 35a (45a) is formed between the pair of opposing surfaces. Will be inserted.
  • the three-piece type disposable diaper 1 is illustrated as an example of the absorbent article, but the present invention is not limited thereto.
  • a two-piece type disposable diaper has a two-layered exterior sheet having an abdominal part, a crotch part, and a dorsal part as a first component, and is fixed to the skin side of the exterior sheet.
  • This is a type of diaper having a sexable main body 10 as a second part.
  • a tape-type disposable diaper has an abdominal side that covers the wearer's torso from the abdomen and a back side that covers the torso from the dorsal side. It is a type of diaper that uses a fastening tape to connect.
  • the weld portion j having a substantially square shape in plan view is exemplified as the joint portion, but the shape of the weld portion j is not limited to this.
  • the shape may be a circle or a shape having a longitudinal direction such as a rectangle or an ellipse.
  • the longitudinal direction may be along the transport direction (lateral direction), may be along the CD direction (vertical direction), or the transport direction. And it may be along the direction intersecting with both the CD direction.
  • the welded portions j, j... are provided in a so-called lattice arrangement defined in the horizontal direction and the vertical direction (longitudinal direction). That is, although each welding part j, j ... was each provided in the intersection of the virtual straight line along a horizontal direction, and the virtual straight line along a vertical direction, it is not restricted to this at all.
  • the welded portions j, j... May be provided in a so-called staggered arrangement by providing the welded portions j, j.
  • these welded portions j, j... are arranged side by side along the vertical direction, but the present invention is not limited thereto. For example, you may arrange
  • the welded portion j is not provided between the welded portion pairs jP and jP adjacent to each other in the vertical direction (CD direction).
  • one or more welded portions j may be provided between the welded portion pairs jP and jP.
  • this welding part j does not contribute to attachment to the nonwoven fabric 32, 33 (42, 43) of the thread rubber 35 (45), but contributes only to joining of the nonwoven fabric 32, 33 (42, 43). It is.
  • the horn 61h of the ultrasonic welding device 60 of FIG. 10A is a roll that rotates around the rotation axis along the CD direction, but is not limited thereto.
  • the horn 61h may be non-rotating (not shown).
  • the horn 61h has a substantially flat vibration surface facing the outer peripheral surface 61as of the anvil roll 61a, and the vibration surface expands or contracts the distance between the outer peripheral surface 61as of the anvil roll 61a. Vibrate in the direction of
  • the thread rubber 35 (45) that is to be expanded in the CD direction while being contracted in the transport direction based on the cutting in the generation process of the sixth processing position PK6 in FIG. , J are clamped in the CD direction, whereby the rubber thread 35 (45) is attached to the two non-woven fabrics 32, 33 (42, 43), but is not limited thereto. That is, it is inserted in a pair of opposing surfaces 32ast and 33ast (42ast and 43ast) of the continuous sheets 32a and 33a (42a and 43a) related to the two nonwoven fabrics 32 and 33 (42 and 43) at a stage prior to the generation process.
  • the continuum 35a (45a) and the intermediate 35m (45m) are contracted in the transport direction.
  • the continuous body 35a (45a) and the intermediate body 35m (45m) may be attached by being pressed in the CD direction between the welded portions j, j on both sides. For example, in the continuous body 1s of the pant-type diaper of FIG.
  • the stretched state of the thread rubber continuum 35a (45a) and the intermediate body 35m (45m) is relaxed, and the continuum 35a (45a) and the intermediate body 35m (45m )
  • the continuous body 35a (45a) and the intermediate body 35m (45m) may be attached by being clamped in the CD direction between the welded portions j, j on both sides.
  • the diaper 1 may be generated by cutting the continuous body 1s of the pants-type diaper in the generation step.
  • the ultrasonic welding apparatus 60 as shown in FIG. 10A is shown as an example of the winding and conveying apparatus, but the present invention is not limited to this.
  • a so-called heat seal device (not shown) may be used. That is, the heat seal device has a receiving roll that rotates along the conveying direction while having a heated smooth outer peripheral surface instead of the horn 61h, and a convex corresponding to the welded portion j instead of the anvil roll 61a. It has an embossing roll that rotates along the transport direction while having a portion on the heated outer peripheral surface.
  • the blade tips of the cutter blades 61ac, 61ac... Provided on the outer peripheral surface 61as of the anvil roll 61a are inclined from the CD direction in the developed state of FIG. For example, it may be parallel to the CD direction.
  • the thread rubber continuum 35a (45a) is cut by the cutter blade 61ac on the outer peripheral surface 61as of the anvil roll 61a.
  • the cutting mode of the cutter blade 61ac adopts various modes. Can do.
  • the cutting edge of the cutter blade 61ac and the outer peripheral surface 61hs of the horn 61h may be in contact with each other at the time of cutting, or the non-contacting mode, that is, the cutting edge of the cutter blade 61ac and the outer periphery of the horn 61h.
  • the thread rubber continuous body 35a (45a) may be cut in a state where there is always a small gap between the surface 61hs.
  • the provision of such a gap is realized by providing so-called bearers, which are so-called bearers, on both sides in the CD direction on the outer peripheral surface 61as of the anvil roll 61a in an annular shape over the entire circumference in the rotational direction Dc61a. This can be done by contacting the outer peripheral surface 61hs of 61h. Further, the cutting edge of the cutter blade 61ac may be sharp, rounded, or may have a curved surface or a flat surface facing the outer peripheral surface 61hs of the horn 61h. That is, as long as the thread rubber continuous body 35a (45a) can be cut, any cutting mode including the presence or absence of the gap as described above may be adopted. Incidentally, which cutting mode is adopted is determined in consideration of the fineness (dtex) of the thread rubber continuum 35a (45a), the target value of the expansion ratio, and the like.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

La présente invention concerne un procédé de production d'un élément en feuille pourvu d'une zone à étirement faible et d'une zone à étirement élevé. La présente invention comprend : une étape qui place un corps continu de matériau élastique (35a) dans un état étiré entre des surfaces opposées de feuilles de substrat continues de l'élément en feuille (31) ; une étape de transport qui enroule le corps continu sur la surface périphérique externe (61as) d'un corps rotatif, de façon à obtenir le transport ; et une étape de fabrication dans laquelle le corps continu est coupé à des points prédéterminés (PC) pour fabriquer une feuille de substrat. Dans l'étape de transport, des jointures (j) pour assembler les surfaces opposées sont formées dans une zone correspondante à étirement élevé (AH1) du corps continu sur les deux côtés du corps continu de matériau élastique dans une direction CD, au moyen de saillies sur la surface périphérique externe, et des intermédiaires (35m) d'éléments élastiques sont formés dans une zone correspondante à étirement faible (AL1) par découpe du corps continu de matériau élastique avec une lame de coupe sur la surface périphérique externe. Dans l'étape de formation, les intermédiaires sont également découpés en des points prédéterminés, de façon à former des éléments élastiques (35). Les éléments élastiques, ayant subi une extension dans la direction CD, sont ensuite resserrés par les jointures sur les deux côtés dans la direction CD.
PCT/JP2017/010138 2017-03-14 2017-03-14 Procédé de production et dispositif de production pour élément en feuille utilisé dans des articles absorbants Ceased WO2018167836A1 (fr)

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PCT/JP2017/010138 WO2018167836A1 (fr) 2017-03-14 2017-03-14 Procédé de production et dispositif de production pour élément en feuille utilisé dans des articles absorbants

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JP2020054744A (ja) * 2018-10-04 2020-04-09 ユニ・チャーム株式会社 伸縮性シートの製造方法、伸縮性シートの製造装置、及び、伸縮性シート
JP2020054742A (ja) * 2018-10-04 2020-04-09 ユニ・チャーム株式会社 伸縮性シートの製造方法、及び、伸縮性シートの製造装置
JP2020054741A (ja) * 2018-10-04 2020-04-09 ユニ・チャーム株式会社 伸縮性シートの製造方法、及び、伸縮性シートの製造装置
JP2020188874A (ja) * 2019-05-20 2020-11-26 ユニ・チャーム株式会社 吸収性物品、及び吸収性物品の製造方法
WO2021020171A1 (fr) * 2019-07-31 2021-02-04 ユニ・チャーム株式会社 Procédé de fabrication d'élément de feuille pour article absorbant, et article absorbant
US10966873B2 (en) 2016-12-20 2021-04-06 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands unwound from spools on surface unwinders
US11129753B2 (en) 2017-09-01 2021-09-28 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates
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