WO2017056807A1 - Pants-type disposable diaper - Google Patents

Pants-type disposable diaper Download PDF

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Publication number
WO2017056807A1
WO2017056807A1 PCT/JP2016/074967 JP2016074967W WO2017056807A1 WO 2017056807 A1 WO2017056807 A1 WO 2017056807A1 JP 2016074967 W JP2016074967 W JP 2016074967W WO 2017056807 A1 WO2017056807 A1 WO 2017056807A1
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WO
WIPO (PCT)
Prior art keywords
elastic film
sheet layer
stretchable
sheet
melt adhesive
Prior art date
Application number
PCT/JP2016/074967
Other languages
French (fr)
Japanese (ja)
Inventor
貴史 松村
Original Assignee
大王製紙株式会社
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Filing date
Publication date
Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Publication of WO2017056807A1 publication Critical patent/WO2017056807A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • 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
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/82—Testing the joint
    • B29C65/8253—Testing the joint by the use of waves or particle radiation, e.g. visual examination, scanning electron microscopy, or X-rays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B29C66/81429—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/48—Wearing apparel
    • B29L2031/4871—Underwear
    • B29L2031/4878—Diapers, napkins

Definitions

  • the present invention relates to a pants-type disposable diaper.
  • the pants-type disposable diaper includes an exterior body that individually or integrally configures the front body and the back body, and an interior body including an absorbent body that is attached to the inner surface of the exterior body so as to extend from the front body to the back body.
  • a waist opening and a pair of left and right leg openings are formed by joining the side edges of the outer body of the front body and the side edges of the outer body of the rear body to form a side seal part. Is.
  • the outer body of the pants-type disposable diaper is provided with elastic members such as rubber thread in the waist area that is defined as the front-rear direction range (the front-rear direction range from the waist opening to the upper end of the leg opening) with side seals.
  • elastic members such as rubber thread
  • As an elastic member for that purpose a number of conventional elastic members such as rubber thread are elongated in the longitudinal direction.
  • the method of fixing in a line is widely adopted, a method of attaching an elastic film in a stretched direction in a stretchable direction has been proposed as an excellent surface fit. (For example, refer to Patent Document 1).
  • the elastic film stretchable structure (hereinafter also referred to as an elastic film stretchable structure) is formed by laminating an elastic film between a first sheet layer made of a nonwoven fabric and a second sheet layer made of a nonwoven fabric, In a state where the elastic film is stretched in the stretching direction along the surface thereof, the first sheet layer and the second sheet layer are arranged in a number of dotted shapes arranged at intervals in the stretching direction and the direction orthogonal thereto. In the sheet joining portion, the sheet is joined through a through hole formed in the elastic film.
  • Such an elastic film stretchable structure is such that, in the natural length state, as the elastic film contracts between the sheet joining portions, the interval between the sheet joining portions becomes narrow, and the sheet joining portions in the first sheet layer and the second sheet layer A contraction fold extending in the direction intersecting the expansion / contraction direction is formed therebetween.
  • the elastic film is stretched between the sheet joining portions at the time of stretching, the spacing between the sheet joining portions and the shrinkage wrinkles in the first sheet layer and the second sheet layer spread, and the first sheet layer and the second sheet layer Elastic extension is possible up to the fully deployed state.
  • This elastic film stretchable structure is excellent in surface fit, and there is no bonding between the first sheet layer and the second sheet layer and the elastic film, and the first sheet layer and the second sheet layer are extremely bonded. Since there are few, it is very flexible, and there exists an advantage that the through-hole of an elastic film contributes also to air permeability improvement.
  • a stretchable region As wide as possible with the same elastic film in order to simplify the structure and reduce material costs.
  • the elastic film stretchable structure usually cannot change the tightening force in a direction orthogonal to the stretchable direction.
  • the elastic film stretchable structure is unsuitable for exerting a strong tightening force because the elastic film becomes weak when the elastic film is thinned to ensure flexibility. Therefore, it has been difficult to provide a stretchable structure using the same elastic film over the edge portion of the opening where a relatively strong tightening force is desired, such as the waist portion and the leg periphery portion, and the subsequent portion.
  • an elongated elastic member such as a thread rubber is not provided on an edge portion of an opening where a relatively strong tightening force is desired, such as a waist portion or a leg periphery portion, without providing an elastic film or with an elastic film. It has been proposed to provide (see, for example, Patent Document 2).
  • the main subject of this invention is providing the underpants type disposable diaper which can clamp
  • the present invention that has solved the above problems is as follows.
  • ⁇ Invention of Claim 1> In the pants-type disposable diaper in which the side edge of the front body and the side edge of the back body are joined on both sides in the width direction to form a waist opening and a leg opening, An elastic film is laminated between the first sheet layer and the second sheet layer from the edge portion of at least one of the waist opening and the leg opening to the subsequent portion, and the first sheet layer and the second sheet layer Has a stretchable region stretched in the width direction, directly or indirectly joined by a large number of sheet joints arranged at intervals, At the edge portion of the opening in the stretchable region, at least one of the first sheet layer and the elastic film and between the second sheet layer and the elastic film is bonded by a stretchable hot melt adhesive, In the region having no stretchable hot melt adhesive in the stretchable region, the elastic film shrinks in the width direction due to the shrinkage of the elastic film, and is extensible in the width direction, In the region having the stretchable hot melt adhesive, the elastic film and the stretch
  • the elastic film and the stretchable hot melt adhesive are used at the edge part of at least one of the waist opening and the leg opening, and the subsequent part is elasticized only by the elastic film. Since it expands and contracts, the edge portion of the opening and the subsequent portion have the same elastic film stretchable structure, but the edge portion of the opening can be tightened more strongly. Therefore, a favorable fit for a pants-type disposable diaper can be created with only an elastic film.
  • the elastic film since the elastic film is bonded to at least one of the first sheet layer and the second sheet layer by the stretchable hot melt adhesive at the edge portion of the opening, the elastic film and sheet are formed at the edge portion of the opening. The layers can be freely separated to reduce the appearance and the possibility that the sheet joint will peel off.
  • the stretchable hot melt adhesive When the stretchable hot melt adhesive is used, it is inevitable that the bonded portion is hardened. However, as described in this section, the stretchable hot melt adhesive is disposed outside the elastic film of the first sheet layer and the second sheet layer. If the elastic hot-melt adhesive is provided only between the elastic film and the elastic film, the elastic hot melt adhesive is applied to the skin through the elastic film and the elastic film. Therefore, the hardening by the stretchable hot melt adhesive hardly affects the touch.
  • the edge of the leg opening is formed in a curved shape around the leg, At the edge portion of the leg opening, a plurality of adhesive portions by the stretchable hot melt adhesive in a rectangular shape are arranged in the front-rear direction, and the end portion on the center side in the width direction forms a step shape around the leg,
  • a stretchable hot melt adhesive If used, it is unavoidable to harden the bonded part, but as described in this section, the bonded part is elongated in the width direction, and a plurality is provided with an interval in the front-rear direction. Hardening due to the reduced hot melt adhesive can be suppressed.
  • edge portion of the opening and the subsequent portion are stretchable structures made of the same elastic film, but the edge portion of the opening can be tightened more strongly.
  • FIG. 1 is a CC cross-sectional view of FIG. 1
  • FIG. 2 is a cross-sectional view taken along the line AA in FIG.
  • FIG. 3 is a cross-sectional view taken along the line BB in FIG.
  • (A) is a plan view of the main part of the stretchable region
  • (b) is a sectional view taken along the line DD in (a)
  • (c) is a sectional view in the mounted state
  • (d) is a sectional view in the natural length state. It is the (a) microscope picture from a plane direction of the expansion-contraction area
  • (A) is a plan view of the main part of the stretchable region
  • (b) is a sectional view taken along the line DD in (a)
  • (c) is a sectional view in the mounted state
  • (d) is a sectional view in the natural length state. It is the (a) microscope picture from a plane direction of the expansion-contraction area
  • (A) is a plan view of the main part of the non-stretchable region
  • (b) is a DD sectional view of (a)
  • (c) is a sectional view in a mounted state
  • (d) is a sectional view in a natural length state. It is a photograph of the non-stretchable region of the sample. It is a principal part enlarged plan view of a non-expandable region. It is a principal part enlarged plan view of FIG. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state.
  • (A) is a CC cross-sectional view of FIG. 15, and (b) is an EE cross-sectional view of FIG.
  • FIG. 1 to 6 show a pants-type disposable diaper.
  • This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an exterior body 20 that forms a front body F and a back body B, and an interior body 10 that is fixed to and integrated with the inner surface of the exterior body 20.
  • the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12.
  • the interior body 10 and the exterior body 20 are the front body F and the back body B. Are folded at the center in the front-rear direction (longitudinal direction), and the side seal portions 21 are formed by joining both sides thereof by heat welding or hot melt adhesive, thereby forming a waist opening and a pair of left and right A pants-type disposable diaper with a leg opening.
  • the interior body 10 has a structure in which an absorbent body 13 is interposed between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12 made of polyethylene or the like. In addition, the excretory fluid that has passed through the top sheet 11 is absorbed and held.
  • the planar shape of the interior body 10 is not particularly limited, it is generally a rectangular shape as shown in FIG.
  • a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used as the liquid-permeable top sheet 11 covering the front side (skin side) of the absorbent body 13.
  • the material fibers that make up the nonwoven fabric can be synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, natural fibers such as cotton, and the spunlace method.
  • a nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.
  • liquid permeable top sheet 11 When a large number of through holes are formed in the liquid permeable top sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent.
  • the liquid-permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.
  • liquid-impermeable sheet 12 covering the back side (non-skin contact side) of the absorbent body 13 a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used, but in recent years, it has moisture permeability from the viewpoint of preventing stuffiness.
  • This water-impervious and moisture-permeable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.
  • Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. Can be used.
  • the absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer.
  • the shape of the absorber 13 is formed in a substantially hourglass shape having a narrowed portion 13N having a narrower width than the front and rear sides in the crotch portion, but may be an appropriate shape such as a rectangular shape.
  • the size of the constricted portion 13N can be determined as appropriate, but the length in the front-rear direction of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion is 40% of the total width of the absorber 13. It can be about 60%.
  • the planar shape of the interior body 10 is substantially rectangular, the remainder of the interior body 10 that does not have the absorber 13 in the portion corresponding to the constricted portion 13N of the absorber 13 A part is formed.
  • the three-dimensional gather BS that fits around the legs is formed on both sides of the interior body 10.
  • the three-dimensional gather BS includes a fixed portion fixed to a side portion on the back surface of the interior body, and a side portion on the surface of the interior body from the fixed portion to the side of the interior body.
  • the body part that extends to the front, the front and rear ends of the body part in a lying state, and the lying part that is fixed to the side of the surface of the interior body, and the freedom part that is formed with this lying part being unfixed
  • the part is formed of a gathered nonwoven fabric 15 that is turned into a double sheet by folding.
  • an elongated gather elastic member 16 is disposed at the free end of the free portion.
  • the gather elastic member 16 is for forming a three-dimensional gather BS by raising a free part by elastic stretching force as shown by a two-dot chain line in FIG. 5 in the product state.
  • the liquid-impermeable sheet 12 is folded back on the both sides in the width direction of the absorber 13 together with the liquid-permeable top sheet 11.
  • this liquid-impermeable sheet 12 it is desirable to use an opaque sheet so that brown color such as defecation and urine does not appear.
  • a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.
  • the gather elastic member 16 materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester and the like that are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less.
  • the gathered elastic member 16 may be a tape-like member having a certain width in addition to the thread-like shape shown in the figure.
  • the material fibers constituting the gathered nonwoven fabric 15 are olefin-based, polyester-based, amide-based synthetic fibers such as polyethylene or polypropylene, recycled fibers such as rayon and cupra, and cotton.
  • Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability.
  • the gathered nonwoven fabric 15 in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.
  • the back surface of the interior body 10 is fixed to the inner surface of the exterior body 20 with a hot melt adhesive or the like in the inner and outer fixing regions 10 ⁇ / b> B (shaded region).
  • This inner / outer fixed region 10 ⁇ / b> B extends across the front and rear sides of the non-absorbent body side portion 17 with a width extending from one non-absorbent body side portion 17 to the other non-absorbent body side portion 17.
  • the side edge of the inner / outer fixing region 10B is preferably located laterally from the middle in the width direction of the non-absorbent body side portion 17, and in particular, the exterior body over almost the whole width direction of the interior body 10 and almost the whole front and rear direction. More preferably, it is fixed to 20.
  • the exterior body 20 extends from the side edge of the absorber 13 to the side. As long as this is the case, the exterior body 20 is located in the crotch portion even if the side edge of the exterior body 20 is located on the center side in the width direction from the side edge of the interior body 10 or on the outer side in the width direction. Also good. Further, the exterior body 20 is a front-rear direction range between a waistline T corresponding to the side seal portion 21 and a front-rear range, a waistline T of the front body F, and a waistline T of the back body B. And an intermediate portion L. And in the exterior body 20 of the illustrated form, except for the middle in the front-rear direction of the intermediate portion L, as shown in FIGS.
  • first sheet layer 20 ⁇ / b> A and the second sheet layer 20 ⁇ / b> B penetrate the elastic film 30 with a large number of sheet joint portions 40 arranged at intervals. It has the elastic film expansion-contraction structure 20X joined through the through-hole 31, and the expansion-contraction direction was made into the width direction.
  • the first sheet layer 20 ⁇ / b> A and the second sheet layer 20 ⁇ / b> B may be indirectly joined through the elastic film 30 instead of through the through hole 31 of the elastic film 30.
  • the planar shape of the exterior body 20 is formed by concave leg-around lines 29 so that both side edges of the intermediate portion L in the width direction form leg openings, respectively, and has a pseudo hourglass shape as a whole.
  • the exterior body 20 may be divided into two parts in the front-rear direction so that both are separated in the front-rear direction at the crotch part.
  • the form shown in FIGS. 1 and 2 is a form in which the elastic film stretchable structure 20X extends to the waist end region 23, but when the elastic film stretchable structure 20X is used for the waist end region 23, the waist end portion is used. If necessary, as shown in FIGS. 15 and 16, the waist end region 23 is not provided with the elastic film stretchable structure 20X as shown in FIGS. A telescopic structure 20 ⁇ / b> X by the member 24 can also be provided.
  • the waist elastic member 24 is an elongated elastic member such as a plurality of thread rubbers arranged at intervals in the front-rear direction, and gives an elastic force so as to tighten around the body torso.
  • the waist elastic members 24 are not arranged substantially as a single bundle with a close spacing, but with a spacing of about 3 to 8 mm so as to form a predetermined stretch zone, preferably three or more, preferably Five or more are arranged.
  • the elongation rate at the time of fixing the waist elastic member 24 can be determined as appropriate, but can be about 230 to 320% for a normal adult.
  • thread rubber is used in the illustrated example, but other elongated elastic members such as flat rubber may be used.
  • the middle part L between the waist part T of the front body F and the waist part T of the back body B is not provided with an elastic film stretchable structure 20X.
  • a stretchable structure 20X is continuously provided in the front-rear direction from the inside of the waist T of the F to the inside of the waist T of the back body B through the intermediate part L, or only one of the front body F and the back body B is elastic. It is also possible to provide a film stretchable structure 20X.
  • the shapes of the individual sheet joint portions 40 and the through-holes 31 in the natural length state can be determined as appropriate, but are perfectly round (see FIGS. 7 and 8), oval, triangle, and rectangle (see FIGS. 9 to 12). ), Rhombus (see FIG. 13B), etc., or convex lens shape (see FIG. 13A), concave lens shape (see FIG. 13C), star shape, cloud shape, etc. be able to.
  • the dimensions of the individual sheet joints are not particularly limited, but the maximum length is preferably 0.5 to 3.0 mm, particularly preferably 0.7 to 1.1 mm, and the maximum width 40x is 0.1 to 3.0 mm.
  • the thickness is preferably 0.1 to 1.1 mm.
  • each sheet bonding portion 40 may be determined as appropriate. However, if the size is too large, the hardness of the sheet bonding portion 40 has an effect on the touch. If the size is too small, the bonding area is small and the materials are sufficiently bonded to each other. In general, the area of each sheet joint portion 40 is preferably about 0.14 to 3.5 mm 2 because it cannot be performed. The area of the opening of each through hole 31 may be equal to or larger than the sheet joint portion because the sheet joint portion is formed through the through hole 31, but is about 1 to 1.5 times the area of the sheet joint portion. It is preferable.
  • the area of the opening of the through-hole 31 means a value in a state of being integrated with the first sheet layer 20A and the second sheet layer 20B, not in the state of the elastic film 30 alone, and in a natural length state.
  • the area of the opening 31 is not uniform in the thickness direction, such as when the elastic film 30 is different from the front and back, it means the minimum value.
  • the planar arrangement of the sheet joint portion 40 and the through-holes 31 can be determined as appropriate, but a regularly repeated planar arrangement is preferable, and an oblique lattice shape as shown in FIG. Hexagonal lattice shape as shown (these are also called zigzag shapes), square lattice shape as shown in FIG. 21 (c), rectangular lattice shape as shown in FIG. 21 (d), as shown in FIG. 21 (e) Parallel body lattice (as shown in the figure, two groups are provided so that a large number of groups of parallel diagonal rows intersect each other), etc. (these are inclined at an angle of less than 90 degrees with respect to the expansion and contraction direction And a group of sheet joint portions 40 (group unit arrangement may be regular or irregular, and may be a pattern or a letter shape) is regularly repeated. You can also
  • the bonding of the first sheet layer 20 ⁇ / b> A and the second sheet layer 20 ⁇ / b> B in the sheet bonding portion 40 is performed through the through hole 31 formed in the elastic film 30.
  • the elastic film 30 is not bonded at least except between the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40.
  • the joining means of the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40 is not particularly limited.
  • the joining of the first sheet layer 20A and the second sheet layer 20B in the joining portion 40 may be performed by a hot melt adhesive, or may be performed by a joining means such as heat sealing or ultrasonic sealing.
  • the form in which the sheet bonding portion 40 is formed by material welding is the first sheet layer 20 ⁇ / b> A in the sheet bonding portion 40.
  • a first welding form in which the first sheet layer 20A and the second sheet layer 20B are joined only by the majority or part of the molten solidified material 20m of at least one of the second sheet layer 20B see FIG. 17A
  • the second welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined by all or most of the elastic film 30 in the sheet joining portion 40 or only a part of the melt-solidified material 30m see FIG. 17B).
  • the first sheet layer is composed of a part of the melt-solidified material 20m of the first sheet layer 20A and the second sheet layer 20B and the whole or most of the melt-solidified material 30m of the elastic film 30 in the sheet joint portion 40. 20A and the second sheet layer 20B are joined together.
  • the elastic film 30 which is reflected in white
  • the elastic film is melted and solidified between the fiber melted and solidified materials 20m of the first sheet layer 20A or the second sheet layer 20B. No object is seen (the white part is the boundary of the fiber melt-solidified product 20m and the irregular reflection of the fiber melt-solidified product 20m).
  • the first sheet layer 20A and the second sheet 20A and the second sheet 20A and the second sheet layer 20B are used by using at least one of the first sheet layer 20A and the second sheet layer 20B as the adhesive.
  • the composite fiber contains not only the core but also the central part of the single component fiber), but the surrounding part (including not only the sheath but also the surface part of the single component fiber of the composite fiber) melts, The fibers do not melt at all, but the remaining fibers either completely melt or the core remains but the surrounding portion includes a molten form.
  • the peel strength becomes high.
  • the first sheet layer 20A and the second sheet layer 20B have a melting point that is higher than the melting point of the elastic film 30 and the heating temperature when forming the sheet joint 40.
  • the elastic film 30 is sandwiched between the second sheet layers 20 ⁇ / b> B, the portion to be the sheet bonding portion 40 is pressurized and heated, and only the elastic film 30 is melted.
  • the first sheet layer 20A and the second sheet layer 20B are between the first sheet layer 20A and the second sheet layer 20B under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic film 30. It can be manufactured by sandwiching the elastic film 30, pressurizing and heating a portion to be the sheet bonding portion 40, and melting at least one of the first sheet layer 20 ⁇ / b> A and the second sheet layer 20 ⁇ / b> B and the elastic film 30.
  • the elastic film 30 preferably has a melting point of about 80 to 145 ° C., and the first sheet layer 20A and the second sheet layer 20B have melting points of about 85 to 190 ° C., particularly about 150 to 190 ° C.
  • the difference between the melting point of the first sheet layer 20A and the second sheet layer 20B and the melting point of the elastic film 30 is preferably about 60 to 90 ° C.
  • the heating temperature is preferably about 100 to 150 ° C.
  • the melt-solidified product 30m of the elastic film 30 is a sheet joint portion as shown in FIG. 40 may penetrate between the fibers in the entire thickness direction of the first sheet layer 20A and the second sheet layer 20B, but as shown in FIGS. 17 (b) (c) and 18 (a), it is intermediate in the thickness direction.
  • FIG. 20 shows an example of an ultrasonic sealing device suitable for forming the second welding form and the third welding form.
  • this ultrasonic sealing apparatus when the sheet bonding portion 40 is formed, the first sheet layer 20A, between the anvil roll 60 and the ultrasonic horn 61, each having a projection 60a formed in the pattern of the sheet bonding portion 40 on the outer surface, The elastic film 30 and the second sheet layer 20B are fed.
  • the feeding drive speed of the elastic film 30 on the upstream side by the feeding drive roll 62A and the nip roll 62B is made slower than the feeding speed after the anvil roll 60 and the ultrasonic horn 61, thereby bringing the feeding drive roll 62A and the nip roll 62B.
  • the elastic film 30 is stretched in the MD direction (machine direction, flow direction) to a predetermined stretch rate through the path from the nip position due to the above to the seal position due to the anvil roll 60 and the ultrasonic horn 61.
  • the stretch rate of the elastic film 30 can be set by selecting the speed difference between the anvil roll 60 and the feed drive roll 62, and can be set to about 300% to 500%, for example.
  • 63 is a guide roller.
  • the first sheet layer 20 ⁇ / b> A, the elastic film 30, and the second sheet layer 20 ⁇ / b> B fed between the anvil roll 60 and the ultrasonic horn 61 are stacked in this order, and the protrusion 60 a and the ultrasonic horn 61 are While being pressurized, the ultrasonic horn 61 is heated by ultrasonic vibration energy to melt only the elastic film 30 or at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic film 30 are melted.
  • the first sheet layer 20 ⁇ / b> A and the second sheet layer 20 ⁇ / b> B are joined through the through-hole 31 at the same time as the through-hole 31 is formed in the elastic film 30. Therefore, in this case, by selecting the size, shape, separation interval, arrangement pattern in the roll length direction and roll circumferential direction, etc., of the projections 60a of the anvil roll 60, the area ratio of the sheet joining portion 40 is selected. Can do.
  • the through-hole 31 is formed is not necessarily clear, but it is considered that the hole corresponding to the protrusion 60a of the anvil roll 60 in the elastic film 30 is melted and separated from the surroundings.
  • the portion of the elastic film 30 between the adjacent through holes 31 aligned in the expansion / contraction direction is expanded / contracted by the through holes 31 as shown in FIGS. 7A, 9A, and 11A. Since it is cut from both sides and loses the support on both sides in the contraction direction, the central side in the direction orthogonal to the expansion / contraction direction is balanced with the central side in the expansion / contraction direction within a range that can maintain continuity in the direction orthogonal to the contraction direction.
  • the through hole 31 expands in the expansion / contraction direction.
  • the constituent material of the first sheet layer 20A and the second sheet layer 20B can be used without particular limitation as long as it is a sheet, but it is preferable to use a nonwoven fabric from the viewpoint of air permeability and flexibility.
  • the nonwoven fabric is not particularly limited as to what the raw fiber is.
  • synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated.
  • the nonwoven fabric may be manufactured by any processing.
  • the processing method examples include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method.
  • the basis weight is preferably about 12 to 20 g / m 2 .
  • a part or all of the first sheet layer 20A and the second sheet layer 20B may be a pair of layers in which one material is folded and faced. For example, as shown in the figure, in the waist end region 23, the constituent material located outside is the second sheet layer 20B, and the folded portion 20C that is folded back to the inner surface side at the waist opening edge is the first sheet layer 20A.
  • the elastic film 30 is interposed therebetween, and in the other portions, the constituent material positioned inside is the first sheet layer 20A, and the constituent material positioned outside is the second sheet layer 20B, and the elastic film 30 is interposed therebetween. Can be interposed.
  • the constituent material of the first sheet layer 20A and the constituent material of the second sheet layer 20B are individually provided over the entire front-rear direction, and the constituent material of the first sheet layer 20A and the second sheet layer are not folded back.
  • the elastic film 30 can also be interposed between the constituent materials of 20B.
  • the elastic film 30 is not particularly limited, and as long as it is a thermoplastic resin film having elasticity per se, a film having a large number of holes and slits for ventilation can also be used. .
  • the tensile strength in the width direction is 8 to 25 N / 35 mm
  • the tensile strength in the front-rear direction is 5 to 20 N / 35 mm
  • the elastic film 30 is preferably 450 to 1050% and the tensile elongation in the front-rear direction is 450 to 1400%.
  • the thickness of the elastic film 30 is not particularly limited, but is preferably about 20 to 40 ⁇ m.
  • the region having the elastic film stretchable structure 20 ⁇ / b> X in the exterior body 20 includes a non-stretchable region 70 and a stretchable region 80 that is provided on at least one side in the width direction of the non-stretchable region 70 and can be stretched in the width direction. Yes.
  • the arrangement of the stretchable region 80 and the non-stretchable region 70 can be determined as appropriate.
  • the portion overlapping the absorber 13 is an area that does not need to be expanded and contracted, and therefore, part or all of the portion overlapping the absorber 13 as illustrated.
  • the non-stretchable region 70 (desirably including almost the entire inner and outer fixed region 10B).
  • the non-stretchable region 70 can be provided from the region overlapping with the absorber 13 to the region not overlapping with the absorber 13 positioned in the width direction or the front-rear direction, and the non-stretchable region 70 is provided only in the region not overlapping with the absorber 13. May be provided.
  • the elastic film 30 has a portion 32 linearly continuous along the width direction, and is contracted in the width direction by the contraction force of the elastic film 30, and can be expanded in the width direction. It has become. More specifically, in a state where the elastic film 30 is extended in the width direction, the through-holes 31 of the elastic film 30 are formed at intervals in the width direction and in the front-rear direction (direction orthogonal to the expansion / contraction direction) orthogonal thereto.
  • the first sheet layer 20 ⁇ / b> A and the second sheet layer 20 ⁇ / b> B are joined together to form a large number of sheet joining portions 40, thereby forming the entire elastic film stretchable structure 20 ⁇ / b> X including both the stretchable region 80 and the non-stretchable region 70.
  • the stretchable region 80 such a stretchability can be imparted by arranging the through holes 31 so that the elastic film 30 has a linearly continuous portion along the width direction.
  • the first sheet layer 20A and the second sheet layer 20B between the sheet joining portions 40 swell in a direction away from each other.
  • a shrinking fold 25 extending in the width direction is formed, but the shrinking fold 25 is stretched but remains, as shown in FIGS. 7 (c) and 9 (c). It has become.
  • the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic film 30 except at least between the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40.
  • FIGS. 7 (c) and 9 (d) assuming the mounted state, and FIGS.
  • the elastic limit elongation in the width direction of the stretchable region 80 is desirably 200% or more (preferably 265 to 295%).
  • the elastic limit elongation of the stretchable region 80 is substantially determined by the stretch rate of the elastic film 30 at the time of manufacture, but based on this, it is lowered by a factor that inhibits shrinkage in the width direction.
  • the main factor of such inhibition is the ratio of the length 40x of the sheet joint portion 40 per unit length in the width direction, and the elastic limit elongation decreases as the ratio increases.
  • the length 40x of the sheet bonding portion 40 has a correlation with the area ratio of the sheet bonding portion 40, so that the elastic limit elongation of the stretchable region 80 can be adjusted by the area ratio of the sheet bonding portion 40.
  • the elongation stress of the stretchable region 80 can be adjusted mainly by the sum of the widths 32w of the portions 32 where the elastic film 30 continues linearly along the width direction.
  • the width 32w of the portion 32 in which the elastic film 30 is linearly continuous along the width direction is equal to the interval 31d in the front-rear direction of the through-holes 31 in contact with both side edges of the continuous portion 32.
  • the extension stress of the stretchable region 80 can be adjusted by the ratio of the length 40y of the sheet joint portion 40 per unit length in the front-rear direction.
  • the elongation stress of the stretchable region 80 can be adjusted by adjusting the length of the sheet bonding portion 40 by the area ratio of the sheet bonding portion 40.
  • the elongation stress of the expansion / contraction region 80 can be determined based on the elongation stress when it is expanded to 50% of the elastic limit.
  • the area ratio of the sheet bonding portion 40 and the area of each sheet bonding portion 40 in the stretchable region 80 can be determined as appropriate, but in the normal case, it is preferably within the following range.
  • Area of sheet joint 40 0.14 to 3.5 mm 2 (particularly 0.14 to 1.0 mm 2 )
  • Area ratio of sheet joint 40 1.8 to 19.1% (especially 1.8 to 10.6%)
  • the elastic limit elongation and the extension stress of the stretchable region 80 can be adjusted by the area of the sheet joint portion 40, a plurality of regions having different area ratios of the sheet joint portion 40 in the stretchable region 80 as shown in FIG.
  • the fitting property can be changed according to the part.
  • the area 81 extending in the oblique direction along the base of the leg in the front body F and the edge area 82 of the leg opening have a higher area ratio of the sheet joint portion 40 than the other areas. Therefore, the extensional stress is weak and the region expands and contracts flexibly.
  • the iliac facing region 83 and the edge region 82 of the leg opening in the back body B also have a higher area ratio of the sheet joint portion 40 than the other regions, and therefore the extension stress is weak and the region expands and contracts flexibly. It has become.
  • the non-stretchable region 70 is a region that does not have a linearly continuous portion along the width direction due to the presence of the through hole 31, although the elastic film 30 is continuous in the width direction. Therefore, in a state where the elastic film 30 is extended in the width direction, the first sheet layer 20 ⁇ / b> A and the second sheet layer are spaced via the through-holes 31 of the elastic film 30 with an interval in the width direction and the front-rear direction orthogonal thereto. Even if the elastic film stretchable structure 20X including both the stretchable region 80 and the non-stretchable region 70 is formed by joining 20B and forming a large number of sheet joint portions 40, as shown in FIG.
  • the stretchable region 80 and the non-stretchable region 70 can be formed by the presence or absence of a portion where the elastic film 30 does not continue linearly along the width direction.
  • the non-stretchable region 70 preferably has an elastic limit elongation in the width direction of 120% or less (preferably 110% or less, more preferably 100%).
  • the arrangement pattern of the through holes 31 in the elastic film 30 in the non-stretchable region 70 can be determined as appropriate, it is arranged in a staggered manner as shown in FIG.
  • the pattern is shorter than the length 31y in the direction, the linear continuity in the width direction can be almost completely eliminated while maintaining the continuity of the elastic film 30, and the appearance is also preferable as shown in FIG.
  • the center interval 31f in the width direction of the through hole 31 is shorter than the length 31x of the through hole 31 in the width direction.
  • the non-stretchable region 70 is stretched to the elastic limit in the width direction.
  • the center distance 31e in the front-rear direction of the through-hole 31 is 0.4 to 2.7 mm, and the length 31y in the front-rear direction of the through-hole 31 is 0.5 to 3.0 mm, particularly 0.7 to 1.1 mm.
  • the center interval 31f in the width direction of the through holes 31 is preferably 0.5 to 2.0 times, particularly 1.0 to 1.2 times the length 31y of the through holes 31 in the front-rear direction.
  • the length 31x in the width direction of 31 is preferably 1.1 to 1.8 times, particularly 1.1 to 1.4 times the center interval 31f in the width direction of the through hole 31.
  • the center interval 31f in the width direction of the through hole 31 Is equal to the center interval 40f in the width direction of the sheet bonding portion 40
  • the center interval 31e in the front-rear direction of the through-hole 31 is equal to the center interval 40e in the front-rear direction of the sheet bonding portion 40
  • the first sheet layer 20A and the second sheet layer 20B and the elastic film 30 are not joined except for the portion between the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40, And when it has a gap formed by separating the peripheral edge of the through hole 31 of the elastic film 30 and the sheet bonding portion 40 on both sides in the width direction of the sheet bonding portion 40 in a natural length state, the material of the elastic film 30 is Even a non-porous film or sheet is preferable because air permeability is always added by this gap. In the case where the above-described simultaneous formation method of the through hole 31 and the sheet joint portion 40 is adopted, this state naturally occurs regardless of the shape or the like of the sheet joint portion 40.
  • seat junction part 40 and the through-hole 31 is not specifically limited, In order to eliminate the linear continuity of the width direction of the elastic film 30, it is desirable that an area is small from a softness
  • the area ratio of the sheet joint portion 40 and the area of each sheet joint portion 40 in the non-stretchable region can be determined as appropriate, in the normal case, if within the following range, the area of each sheet joint portion 40 is small and the sheet It is preferable that the non-stretchable region 70 does not become hard because the area ratio of the joint portion 40 is low.
  • Area of sheet joint 40 0.10 to 0.75 mm 2 (particularly 0.10 to 0.35 mm 2 )
  • Sheet area 40 4 to 13% (especially 5 to 10%)
  • the elastic limit elongation of the non-stretchable region 70 can be changed according to the arrangement pattern of the through holes 31, the dimensions of the individual through holes 31, and the center interval. Therefore, although not shown, these can be made different at a plurality of locations in the stretchable region 80 or between the plurality of non-stretchable regions 70. For example, it is one preferable mode to make the elastic limit elongation in the non-stretchable region 70 of the front body F larger than the elastic limit elongation in the non-stretchable region 70 of the rear body B.
  • the non-stretchable region 70 has a portion that is linearly continuous along the width direction like the stretchable region, the elastic limit elongation is remarkable because the area ratio of the sheet joint portion is higher than the stretchable region. It is also possible to adopt a form that kills other stretchability, such as a form that is 130% or less, a form that is cut at one place or a plurality of places in the width direction, such as a stretchable structure using a conventional rubber thread.
  • the elastic film 30 and the stretchable hot melt adhesive 90 are elastically stretched by the elastic film 30 and the stretchable hot melt adhesive 90 at the edge part of the waist opening and the leg opening, the elastic film 30 is elastically stretched only at the subsequent part. While the edge part of the leg opening and the subsequent part are stretchable structures by the same elastic film 30, the edge part of the waist opening and the edge part of the leg opening can be tightened more strongly. Therefore, it is possible to create a suitable fit for the pants-type disposable diaper with only the elastic film 30.
  • the second sheet layer 20B and the elastic film 30 are bonded to each other at the edge portion of the leg opening by the stretchable hot-melt adhesive 90, the elastic film 30 and the second sheet layer 20B can be freely attached at the leg circumference line 29. It will be separated, and there is little possibility that an appearance will deteriorate or the sheet
  • the stretchable hot melt adhesive 90 is not particularly limited as long as it can reinforce the elongation stress of the elastic film 30.
  • the one described in JP-A-10-88097 can be used.
  • a stretchable hot melt adhesive 90 is applied to the elastic film 30 side surface of the first sheet layer 20A using a hot melt adhesive application device. What is necessary is just to apply
  • the stretchable hot melt adhesive 90 is applied to the elastic film 30, as shown in FIG. 20, the elastic film 30 is applied at a position before the elastic film 30 is stretched by the pre-extension application device 64, or is elastic by the post-extension coating device 65.
  • the film 30 can be applied in a state of being stretched to a predetermined stretch rate.
  • the stretchable hot melt adhesive 90 When the stretchable hot melt adhesive 90 is applied to the elastic film 30 before being stretched, the stretchable hot melt adhesive 90 after being stretched is also stretched together with the elastic film 30.
  • the discharge speed of the stretchable hot melt adhesive 90 by the coating device 64 may be high, the same, or low.
  • the stretching speed of the elastic film 30 is set higher than the discharge speed of the stretchable hot melt adhesive 90 by the coating device 65 after stretching. It is necessary to extend the stretchable hot melt adhesive 90 to the same extent as the elastic film 30 between the discharge nozzle and the contact position of the elastic film 30.
  • the degree of extension can be changed by the ratio of the feeding speed of the elastic film 30 and the discharge speed of the stretchable hot melt adhesive 90 and the characteristics such as the viscosity of the stretchable hot melt adhesive 90. Even when the stretchable hot-melt adhesive 90 is applied to the first sheet layer 20A and the second sheet layer 20B, it can be performed in the same manner as when applied to the stretched elastic film 30.
  • the application method (pattern) of the stretchable hot-melt adhesive 90 is not particularly limited as long as the stretchability of the stretchable hot-melt adhesive 90 is exhibited in the product, and a solid, bead, curtain, summit, spiral coating, or the like is appropriately employed. Can do.
  • the stretchable hot melt adhesive 90 is provided only between the second sheet layer 20 ⁇ / b> B located outside the elastic film 30 and the elastic film 30.
  • the stretchable hot melt adhesive 90 comes into contact with the skin via the first sheet layer 20 ⁇ / b> A located inside the elastic film 30 and the elastic film 30. It becomes difficult to affect the touch.
  • the stretchable hot melt adhesive 90 is used only between the second sheet layer 20B and the elastic film 30 located outside the elastic film 30, or between the first sheet layer 20A and the elastic film 30, and It can also be used between the one sheet layer 20A and the elastic film 30.
  • a rectangular stretchable hot melt adhesive 90 is formed on the edge of the leg opening.
  • the width direction of the exterior body 20 is in the MD direction
  • a large number of bonding portions are arranged in the front-rear direction and the end portion on the center side in the width direction forms a step shape along the periphery of the leg.
  • a region having the stretchable hot melt adhesive 90 can be formed along the edges of the film.
  • An application pattern of the stretchable hot melt adhesive 90 in this form is shown in FIG. As shown in FIG.
  • a plurality of adhesive portions by the rectangular stretchable hot melt adhesive 90 can be arranged in the front-rear direction without being stepped. That's fine.
  • the adhesive portions by the stretchable hot melt adhesive 90 are arranged in the front-rear direction, the adhesive portions by the stretchable hot melt adhesive 90 are elongated in the width direction, and a plurality are provided at intervals in the front-rear direction. Thereby, the hardening by the expansion / contraction hot melt adhesive 90 can be suppressed.
  • the front-rear dimension 90w of the bonded portion is preferably about 1.0 to 5.0 mm, particularly about 1.5 to 3.0 mm.
  • the front-rear dimension 90w of the adhesive portions is about 1.0 to 5.0 mm, particularly about 1.5 to 3.0 mm.
  • the distance in the front-rear direction 90d is preferably about 1.0 to 5.0 mm, particularly about 1.0 to 2.5 mm. Of course, it is possible to be outside this range.
  • the stretchable hot melt adhesive 90 is provided over the entire width direction of the edge portion of the waist opening in the stretchable region 80 and over the entire width direction of the edge portion of the leg opening in the stretchable region 80. It is also possible to reinforce the elongation stress partially by providing only at the portion, for example, only at the intermediate portion in the width direction.
  • the stretchable hot melt adhesive 90 is provided on both the edge portion of the waist opening and the edge portion of the leg opening.
  • the melt adhesive 90 can be provided, or although not shown, the stretchable hot melt adhesive 90 can be provided only at the edge portion of the waist opening.
  • the stretchable hot melt adhesive 90 can be provided for only one of the front body F and the back body B.
  • the front presser sheet 50 extends in the width direction from the inner surface of the folded portion 20C of the waist end region 23 of the inner surface of the outer body 20 of the front body F to a position overlapping the front end portion of the inner body 10.
  • the rear presser sheet 60 extends in the width direction from the inner surface of the folded portion 20C of the waist end region 23 to the position overlapping the rear end portion of the inner body 10 in the inner surface of the outer body 20 of the back body B.
  • the folded portion 20C formed by folding the exterior body 20 on the inner surface of the diaper can be extended to a portion overlapping the interior body 10 to form a portion equivalent to the above-described pressing sheets 50 and 60.
  • -"Front body” and “rear body” mean the front and rear portions of the pants-type disposable diaper in the front-rear direction center, respectively.
  • a crotch part means the front-back direction range containing the center of the front-back direction of a pants type disposable diaper, and when an absorber has a constriction part, it means the front-back direction range of the part which has the said constriction part.
  • Elastic limit elongation means the elongation of the elastic limit in the expansion / contraction direction (in other words, the state in which the first sheet layer and the second sheet layer are completely expanded), and the length at the elastic limit is the natural length. It is expressed as a percentage when 100% is assumed.
  • the “area ratio” means the ratio of the target portion to the unit area, and the target portion (for example, the sheet joint portion 40, the stretchable region 80, the non-stretchable region 70, the main stretchable portion, the buffer stretchable portion) in the target region.
  • the total area of the through holes 31 and the vent holes is divided by the area of the target region and expressed as a percentage.
  • the “area ratio” in the region having the stretchable structure extends to the elastic limit in the stretchable direction. It means the area ratio of the state. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio.
  • “Elongation rate” means a value when the natural length is 100%.
  • ⁇ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ⁇ 5 ° C., relative humidity 65% or less) to obtain a constant weight.
  • Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%.
  • a sample with a size of 200 mm ⁇ 250 mm ( ⁇ 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm ⁇ 250 mm, ⁇ 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
  • ⁇ "Thickness" of the absorber is a thickness measuring instrument from Ozaki Manufacturing Co., Ltd.
  • the initial chuck interval (distance between marked lines) is 50 mm, and the tensile speed is 300 mm / min.
  • AOUTGRAPHAGS-G100N manufactured by SHIMADZU can be used as the tensile tester.
  • ⁇ "Elongation stress” refers to a tensile test according to JIS K7127: 1999 "Plastics-Test method for tensile properties-" with an initial chuck interval (distance between marked lines) of 50 mm and a tensile speed of 300 mm / min. This means the tensile stress (N / 35 mm) measured when stretching in the elastic region, and the degree of stretching can be appropriately determined depending on the test object.
  • the test piece has a rectangular shape with a width of 35 mm and a length of 80 mm or more.
  • the test piece is prepared with a width that can be cut out, and the measured value is 35 mm. The value converted to. Even if the target area is small and sufficient specimens cannot be collected, as long as the magnitude of the extension stress is compared, at least a comparison can be made even if the specimens of the same size are used even if they are appropriately small.
  • the tensile tester for example, AOUTGRAPHAGS-G100N manufactured by SHIMADZU can be used.
  • test state means a state where the plate is flattened without contraction or slack. -Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state. ⁇ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ⁇ 5 °C, relative humidity 65% or less). .
  • the elastic film stretchable structure of the present invention can be applied to an exterior body of a pants-type disposable diaper.
  • B Rear body, F ... Front body, T ... Trunk circumference part, L ... Middle part, 10 ... Interior body, 11 ... Liquid-permeable top sheet, 12 ... Liquid-impermeable sheet, 13 ... Absorber, 13N ... Part: 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Gather elastic member, 20 ... Exterior body, 20A ... First sheet layer, 20B ... Second sheet layer, 20C ... Folded part, 20X ... Elastic film stretchable structure, 21 DESCRIPTION OF SYMBOLS ... Side seal part, 23 ... Waist edge part area

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Abstract

[Problem] To allow opening edges to be strongly tightened while the opening edges and parts extending therefrom are formed as structures which are stretchable due to a single elastic film. [Solution] The problem can be solved by a pants-type disposable diaper comprising stretchable regions (80) that are laterally stretchable and located over areas extending from a waist opening and leg openings. In the stretchable regions (80), an elastic film (30) is laminated between a first sheet layer (20A) and a second sheet layer (20B) and the first sheet layer (20A) and the second sheet layer (20B) are directly or indirectly bonded at a large number of sheet joint parts (40) arranged at intervals. At the opening edges of the stretchable regions (80), at least one of the first sheet layer (20A) and the second sheet layer (20B) is bonded to the elastic film (30) with a stretchable hot-melt adhesive (90). The region with the stretchable hot-melt adhesive (90) laterally contracts due to contraction of the elastic film (30) and the stretchable hot-melt adhesive (90) and are laterally stretchable.

Description

パンツタイプ使い捨ておむつPants-type disposable diaper
　本発明は、パンツタイプ使い捨ておむつに関するものである。 The present invention relates to a pants-type disposable diaper.
　パンツタイプ使い捨ておむつは、前身頃及び後身頃を個別又は一体的に構成する外装体と、前身頃から後身頃にわたるように外装体の内面に取り付けられた、吸収体を含む内装体とを備え、前身頃の外装体の両側縁部と後身頃の外装体の両側縁部とが接合されてサイドシール部が形成されることにより、ウエスト開口及び左右一対の脚開口が形成されているものが一般的である。 The pants-type disposable diaper includes an exterior body that individually or integrally configures the front body and the back body, and an interior body including an absorbent body that is attached to the inner surface of the exterior body so as to extend from the front body to the back body. Generally, a waist opening and a pair of left and right leg openings are formed by joining the side edges of the outer body of the front body and the side edges of the outer body of the rear body to form a side seal part. Is.
　パンツタイプ使い捨ておむつの外装体には、サイドシール部を有する前後方向範囲（ウエスト開口から脚開口の上端に至る前後方向範囲）として定まる胴周り領域等に、糸ゴム等の弾性部材を設けて伸縮性を付加することが一般的となっており（例えば、特許文献１、２参照）、そのための弾性部材としては、従来、糸ゴム等の細長状弾性伸縮部材を長手方向に伸長した状態で多数並べて固定する手法が広く採用されているが、面としてのフィット性に優れるものとして、弾性フィルムを伸縮性の付与方向に伸長した状態で取り付ける手法も提案されている。（例えば特許文献１参照）。 The outer body of the pants-type disposable diaper is provided with elastic members such as rubber thread in the waist area that is defined as the front-rear direction range (the front-rear direction range from the waist opening to the upper end of the leg opening) with side seals. (For example, refer to Patent Documents 1 and 2). As an elastic member for that purpose, a number of conventional elastic members such as rubber thread are elongated in the longitudinal direction. Although the method of fixing in a line is widely adopted, a method of attaching an elastic film in a stretched direction in a stretchable direction has been proposed as an excellent surface fit. (For example, refer to Patent Document 1).
　この弾性フィルムによる伸縮構造（以下、弾性フィルム伸縮構造ともいう）は、伸縮領域が不織布からなる第１シート層と、不織布からなる第２シート層との間に弾性フィルムが積層されてなるとともに、弾性フィルムがそれらの表面に沿う伸縮方向に伸長された状態で、第１シート層及び第２シート層が、伸縮方向及びこれと直交する方向にそれぞれ間隔を空けて配列された多数の点状のシート接合部で、弾性フィルムに形成された貫通孔を通じて接合されてなるものである。このような弾性フィルム伸縮構造は、自然長状態では、シート接合部間において弾性フィルムが収縮するのに伴い、シート接合部の間隔が狭くなり、第１シート層及び第２シート層におけるシート接合部間に伸縮方向と交差する方向に延びる収縮皺が形成される。反対に伸長時には、シート接合部間において弾性フィルムが伸長するのに伴い、シート接合部の間隔及び第１シート層及び第２シート層における収縮皺が広がり、第１シート層及び第２シート層の完全展開状態まで弾性伸長が可能となる。この弾性フィルム伸縮構造は、面的なフィット性に優れるのはもちろん、第１シート層及び第２シート層と弾性フィルムとの接合が無く、かつ第１シート層及び第２シート層の接合も極めて少ないため非常に柔軟であり、また、弾性フィルムの貫通孔が通気性向上にも寄与するという利点がある。 The elastic film stretchable structure (hereinafter also referred to as an elastic film stretchable structure) is formed by laminating an elastic film between a first sheet layer made of a nonwoven fabric and a second sheet layer made of a nonwoven fabric, In a state where the elastic film is stretched in the stretching direction along the surface thereof, the first sheet layer and the second sheet layer are arranged in a number of dotted shapes arranged at intervals in the stretching direction and the direction orthogonal thereto. In the sheet joining portion, the sheet is joined through a through hole formed in the elastic film. Such an elastic film stretchable structure is such that, in the natural length state, as the elastic film contracts between the sheet joining portions, the interval between the sheet joining portions becomes narrow, and the sheet joining portions in the first sheet layer and the second sheet layer A contraction fold extending in the direction intersecting the expansion / contraction direction is formed therebetween. On the other hand, when the elastic film is stretched between the sheet joining portions at the time of stretching, the spacing between the sheet joining portions and the shrinkage wrinkles in the first sheet layer and the second sheet layer spread, and the first sheet layer and the second sheet layer Elastic extension is possible up to the fully deployed state. This elastic film stretchable structure is excellent in surface fit, and there is no bonding between the first sheet layer and the second sheet layer and the elastic film, and the first sheet layer and the second sheet layer are extremely bonded. Since there are few, it is very flexible, and there exists an advantage that the through-hole of an elastic film contributes also to air permeability improvement.
　パンツタイプ使い捨ておむつにおいて、外装体に弾性フィルム伸縮構造を採用する場合、構造の簡素化及び資材コストの抑制のためには、同一の弾性フィルムによりできるだけ広範囲に伸縮領域を形成することが望まれる。しかし、弾性フィルム伸縮構造は、通常では伸縮方向と直交する方向に締め付け力を変化させることができない。また、弾性フィルム伸縮構造は、柔軟性を確保するために弾性フィルムを薄くすると弾性フィルムが弱くなるため、どちらかといえば締め付け力を強く発揮させるのに不向きな構造である。したがって、ウエスト部や脚周り部のように比較的に強い締め付け力が望まれる開口の縁部分と、それに続く部分とにわたり、同一の弾性フィルムによる伸縮構造を設けることは困難であった。 In a pants-type disposable diaper, when an elastic film stretchable structure is used for the exterior body, it is desired to form a stretchable region as wide as possible with the same elastic film in order to simplify the structure and reduce material costs. However, the elastic film stretchable structure usually cannot change the tightening force in a direction orthogonal to the stretchable direction. The elastic film stretchable structure is unsuitable for exerting a strong tightening force because the elastic film becomes weak when the elastic film is thinned to ensure flexibility. Therefore, it has been difficult to provide a stretchable structure using the same elastic film over the edge portion of the opening where a relatively strong tightening force is desired, such as the waist portion and the leg periphery portion, and the subsequent portion.
　このため、従来、ウエスト部や脚周り部のように比較的に強い締め付け力が望まれる開口の縁部分には、弾性フィルムを設けずに又は弾性フィルムとともに、糸ゴム等の細長状弾性部材を設けることが提案されている（例えば特許文献２参照）。 Therefore, conventionally, an elongated elastic member such as a thread rubber is not provided on an edge portion of an opening where a relatively strong tightening force is desired, such as a waist portion or a leg periphery portion, without providing an elastic film or with an elastic film. It has been proposed to provide (see, for example, Patent Document 2).
特表２００４－５３２７５８号公報JP-T-2004-532758 特表２００９－５３６８４５号公報Special table 2009-536845 国際公開２００８／１２６７０８号International Publication No. 2008/126708
　そこで、本発明の主たる課題は、開口の縁部分及びそれに続く部分が同一の弾性フィルムによる伸縮構造でありながら、開口の縁部分をより強く締め付けることができるパンツタイプ使い捨ておむつを提供することにある。 Then, the main subject of this invention is providing the underpants type disposable diaper which can clamp | tighten the edge part of an opening more strongly, while the edge part of an opening and the subsequent part are the expansion-contraction structure by the same elastic film. .
　上記課題を解決した本発明は次のとおりである。
　＜請求項１記載の発明＞
　前身頃の側縁部と後身頃の側縁部とが幅方向両側で接合されて、ウエスト開口及び脚開口が形成されてなる、パンツタイプ使い捨ておむつにおいて、
　前記ウエスト開口及び脚開口の少なくとも一方の開口の縁部分からそれに続く部分にかけて、第１シート層及び第２シート層の間に弾性フィルムが積層されるとともに、前記第１シート層及び第２シート層が、間隔を空けて配列された多数のシート接合部で直接的又は間接的に接合された、幅方向に伸縮する伸縮領域を有しており、
　前記伸縮領域における前記開口の縁部分では、前記第１シート層及び弾性フィルムの間、並びに前記第２シート層及び弾性フィルムの間の少なくとも一方が、伸縮ホットメルト接着剤により接着されており、
　前記伸縮領域における伸縮ホットメルト接着剤を有しない領域では、前記弾性フィルムの収縮により幅方向に収縮しているとともに、幅方向に伸長可能であり、
　前記伸縮ホットメルト接着剤を有する領域では、前記弾性フィルム及び前記伸縮ホットメルト接着剤の収縮により幅方向に収縮しているとともに、幅方向に伸長可能である、
　ことを特徴とするパンツタイプ使い捨ておむつ。 The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In the pants-type disposable diaper in which the side edge of the front body and the side edge of the back body are joined on both sides in the width direction to form a waist opening and a leg opening,
An elastic film is laminated between the first sheet layer and the second sheet layer from the edge portion of at least one of the waist opening and the leg opening to the subsequent portion, and the first sheet layer and the second sheet layer Has a stretchable region stretched in the width direction, directly or indirectly joined by a large number of sheet joints arranged at intervals,
At the edge portion of the opening in the stretchable region, at least one of the first sheet layer and the elastic film and between the second sheet layer and the elastic film is bonded by a stretchable hot melt adhesive,
In the region having no stretchable hot melt adhesive in the stretchable region, the elastic film shrinks in the width direction due to the shrinkage of the elastic film, and is extensible in the width direction,
In the region having the stretchable hot melt adhesive, the elastic film and the stretchable hot melt adhesive are contracted in the width direction due to contraction, and can be expanded in the width direction.
A pants-type disposable diaper characterized by that.
　（作用効果）
　本発明では、伸縮ホットメルト接着剤を用いることにより、ウエスト開口及び脚開口の少なくとも一方の開口の縁部分では弾性フィルム及び伸縮ホットメルト接着剤の二つにより、それに続く部分では弾性フィルムのみにより弾性伸縮するため、開口の縁部分及びそれに続く部分が同一の弾性フィルムによる伸縮構造でありながら、開口の縁部分をより強く締め付けることができるようになる。よって、弾性フィルムのみでパンツタイプ使い捨ておむつに好ましいフィット性を作り出すことができる。また、本発明では、開口の縁部分において伸縮ホットメルト接着剤により、第１シート層及び第２シート層の少なくとも一方と弾性フィルムとが接着されているため、開口の縁部分で弾性フィルム及びシート層が自由に離間し、見栄えが悪化したり、シート接合部が剥がれたりするおそれが少ないものとなる。 (Function and effect)
In the present invention, by using the stretchable hot melt adhesive, the elastic film and the stretchable hot melt adhesive are used at the edge part of at least one of the waist opening and the leg opening, and the subsequent part is elasticized only by the elastic film. Since it expands and contracts, the edge portion of the opening and the subsequent portion have the same elastic film stretchable structure, but the edge portion of the opening can be tightened more strongly. Therefore, a favorable fit for a pants-type disposable diaper can be created with only an elastic film. In the present invention, since the elastic film is bonded to at least one of the first sheet layer and the second sheet layer by the stretchable hot melt adhesive at the edge portion of the opening, the elastic film and sheet are formed at the edge portion of the opening. The layers can be freely separated to reduce the appearance and the possibility that the sheet joint will peel off.
　＜請求項２記載の発明＞
　前記第１シート層及び第２シート層のうち前記弾性フィルムの外側に位置する方と弾性フィルムとの間にのみ、前記伸縮ホットメルト接着剤が設けられている、請求項１記載のパンツタイプ使い捨ておむつ。 <Invention of Claim 2>
The pants-type disposable according to claim 1, wherein the stretchable hot-melt adhesive is provided only between the elastic film and the one located on the outer side of the elastic film among the first sheet layer and the second sheet layer. Diapers.
　（作用効果）
　伸縮ホットメルト接着剤を用いると、その接着部分の硬質化は避けることができないが、本項記載のように伸縮ホットメルト接着剤を、第１シート層及び第２シート層のうち弾性フィルムの外側に位置する方と弾性フィルムとの間にのみ設けると、伸縮ホットメルト接着剤が、第１シート層及び第２シート層のうち弾性フィルムの内側に位置する方と弾性フィルムとを介して肌に接することとなるため、伸縮ホットメルト接着剤による硬質化が肌触りに影響しにくくなる。 (Function and effect)
When the stretchable hot melt adhesive is used, it is inevitable that the bonded portion is hardened. However, as described in this section, the stretchable hot melt adhesive is disposed outside the elastic film of the first sheet layer and the second sheet layer. If the elastic hot-melt adhesive is provided only between the elastic film and the elastic film, the elastic hot melt adhesive is applied to the skin through the elastic film and the elastic film. Therefore, the hardening by the stretchable hot melt adhesive hardly affects the touch.
　＜請求項３記載の発明＞
　前記脚開口の縁は、脚周りに沿う曲線状に形成されており、
　前記脚開口の縁部分には、矩形状の前記伸縮ホットメルト接着剤による接着部分が複数前後方向に並び、かつその幅方向中央側の端部が脚周りに沿って階段状をなしている、請求項１記載のパンツタイプ使い捨ておむつ。 <Invention of Claim 3>
The edge of the leg opening is formed in a curved shape around the leg,
At the edge portion of the leg opening, a plurality of adhesive portions by the stretchable hot melt adhesive in a rectangular shape are arranged in the front-rear direction, and the end portion on the center side in the width direction forms a step shape around the leg, The pants-type disposable diaper according to claim 1.
　（作用効果）
　パンツタイプ使い捨ておむつにおいては、脚開口の縁が、脚周りに沿う曲線状に形成されている形態が一般的であるが、このような形態であっても、本項記載のように階段状に伸縮ホットメルト接着剤を配置することにより、脚開口の縁に沿って伸縮ホットメルト接着剤を有する領域を形成することができる。 (Function and effect)
In pants-type disposable diapers, it is common for the edges of the leg openings to be formed in a curved shape along the circumference of the legs, but even in such a form, it is stepped as described in this section. By disposing the stretchable hot melt adhesive, a region having the stretchable hot melt adhesive can be formed along the edge of the leg opening.
　＜請求項４記載の発明＞
　前記開口の縁部分には、幅方向に細長く延びる前記伸縮ホットメルト接着剤による接着部分が前後方向に間隔を空けて複数設けられている、請求項１～３のいずれか１項に記載のパンツタイプ使い捨ておむつ。 <Invention of Claim 4>
The pant according to any one of claims 1 to 3, wherein a plurality of adhesive portions made of the stretchable hot melt adhesive extending in the width direction are provided at the edge portion of the opening at intervals in the front-rear direction. Type disposable diapers.
　（作用効果）
　伸縮ホットメルト接着剤を用いると、その接着部分の硬質化は避けることができないが、本項記載のように接着部分を幅方向に細長く延びる形状とし、前後方向に間隔を空けて複数設けることにより、縮ホットメルト接着剤による硬質化を抑制することができる。 (Function and effect)
If a stretchable hot melt adhesive is used, it is unavoidable to harden the bonded part, but as described in this section, the bonded part is elongated in the width direction, and a plurality is provided with an interval in the front-rear direction. Hardening due to the reduced hot melt adhesive can be suppressed.
　＜請求項５記載の発明＞
　前記伸縮ホットメルト接着剤の接着部分は、前後方向寸法が１．０～５．０ｍｍ、前後方向間隔が１．０～５．０ｍｍである、請求項４記載のパンツタイプ使い捨ておむつ。 <Invention of Claim 5>
The pants-type disposable diaper according to claim 4, wherein the adhesive portion of the stretchable hot melt adhesive has a front-rear direction dimension of 1.0 to 5.0 mm and a front-rear direction interval of 1.0 to 5.0 mm.
　（作用効果）
　伸縮ホットメルト接着剤の接着部分の寸法、間隔は特に限定されないが、通常の場合、本項記載の範囲内とすることが望ましい。 (Function and effect)
There are no particular restrictions on the dimensions and spacing of the bonded portions of the stretchable hot melt adhesive, but it is usually desirable to keep them within the range described in this section.
　以上のとおり、本発明によれば、開口の縁部分及びそれに続く部分が同一の弾性フィルムによる伸縮構造でありながら、開口の縁部分をより強く締め付けることができる、等の利点がもたらされる。 As described above, according to the present invention, there are advantages such that the edge portion of the opening and the subsequent portion are stretchable structures made of the same elastic film, but the edge portion of the opening can be tightened more strongly.
展開状態のパンツタイプ使い捨ておむつの平面図（内面側）である。It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. 展開状態のパンツタイプ使い捨ておむつの平面図（外面側）である。It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. 展開状態のパンツタイプ使い捨ておむつの要部のみ示す平面図である。It is a top view which shows only the principal part of the underpants type disposable diaper of an unfolded state. （ａ）は図１のＣ－Ｃ断面図、（ｂ）は図１のＥ－Ｅ断面図である。(A) is a CC cross-sectional view of FIG. 1, and (b) is an EE cross-sectional view of FIG. 図１のＡ－Ａ断面図である。FIG. 2 is a cross-sectional view taken along the line AA in FIG. 図１のＢ－Ｂ断面図である。FIG. 3 is a cross-sectional view taken along the line BB in FIG. （ａ）は伸縮領域の要部平面図、（ｂ）は（ａ）のＤ－Ｄ断面図、（ｃ）は装着状態における断面図、（ｄ）は自然長状態における断面図である。(A) is a plan view of the main part of the stretchable region, (b) is a sectional view taken along the line DD in (a), (c) is a sectional view in the mounted state, and (d) is a sectional view in the natural length state. サンプルの伸縮領域の（ａ）平面方向からの顕微鏡写真、（ｂ）平面方向からの高倍率顕微鏡写真、（ｃ）斜視方向からの高倍率顕微鏡写真である。It is the (a) microscope picture from a plane direction of the expansion-contraction area | region of a sample, (b) the high magnification microscope picture from a plane direction, (c) The high magnification microscope picture from a perspective direction. （ａ）は伸縮領域の要部平面図、（ｂ）は（ａ）のＤ－Ｄ断面図、（ｃ）は装着状態における断面図、（ｄ）は自然長状態における断面図である。(A) is a plan view of the main part of the stretchable region, (b) is a sectional view taken along the line DD in (a), (c) is a sectional view in the mounted state, and (d) is a sectional view in the natural length state. サンプルの伸縮領域の（ａ）平面方向からの顕微鏡写真、（ｂ）平面方向からの高倍率顕微鏡写真、（ｃ）斜視方向からの高倍率顕微鏡写真である。It is the (a) microscope picture from a plane direction of the expansion-contraction area | region of a sample, (b) the high magnification microscope picture from a plane direction, (c) The high magnification microscope picture from a perspective direction. （ａ）は非伸縮領域の要部平面図、（ｂ）は（ａ）のＤ－Ｄ断面図、（ｃ）は装着状態における断面図、（ｄ）は自然長状態における断面図である。(A) is a plan view of the main part of the non-stretchable region, (b) is a DD sectional view of (a), (c) is a sectional view in a mounted state, and (d) is a sectional view in a natural length state. サンプルの非伸縮領域の写真である。It is a photograph of the non-stretchable region of the sample. 非伸縮領域の要部拡大平面図である。It is a principal part enlarged plan view of a non-expandable region. 図２の要部拡大平面図である。It is a principal part enlarged plan view of FIG. 展開状態のパンツタイプ使い捨ておむつの平面図（外面側）である。It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. （ａ）は図１５のＣ－Ｃ断面図、（ｂ）は図１５のＥ－Ｅ断面図である。(A) is a CC cross-sectional view of FIG. 15, and (b) is an EE cross-sectional view of FIG. ある程度伸長した外装体の要部断面を概略的に示す断面図である。It is sectional drawing which shows roughly the principal part cross section of the exterior body extended to some extent. ある程度伸長した外装体の要部断面を概略的に示す断面図である。It is sectional drawing which shows roughly the principal part cross section of the exterior body extended to some extent. （ａ）第１溶着形態で形成されたシート接合部の平面写真、（ｂ）第３溶着形態で形成されたシート接合部の平面写真である。(A) The plane photograph of the sheet | seat junction part formed with the 1st welding form, (b) The plane photograph of the sheet | seat junction part formed with the 3rd welding form. 超音波シール装置の概略図である。It is the schematic of an ultrasonic sealing apparatus. シート接合部の各種配列例を示す平面図である。It is a top view which shows the various arrangement | sequence examples of a sheet | seat junction part. 伸縮ホットメルト接着剤の塗布パターンの平面図である。It is a top view of the application | coating pattern of an expansion-contraction hot melt adhesive.
　以下、本発明の一実施形態について、添付図面を参照しつつ詳説する。なお、断面図中の点模様部分はホットメルト接着剤等の接合手段を示している。
　図１～図６はパンツタイプ使い捨ておむつを示している。このパンツタイプ使い捨ておむつ（以下、単におむつともいう。）は、前身頃Ｆ及び後身頃Ｂをなす外装体２０と、この外装体２０の内面に固定され一体化された内装体１０とを有しており、内装体１０は液透過性トップシート１１と液不透過性シート１２との間に吸収体１３が介在されてなるものである。製造に際しては、外装体２０の内面（上面）に対して内装体１０の裏面がホットメルト接着剤などの接合手段によって接合された後に、内装体１０及び外装体２０が前身頃Ｆ及び後身頃Ｂの境界である前後方向（縦方向）中央で折り畳まれ、その両側部が相互に熱溶着又はホットメルト接着剤などによって接合されてサイドシール部２１が形成されることによって、ウエスト開口及び左右一対のレッグ開口が形成されたパンツタイプ使い捨ておむつとなる。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, the dotted pattern part in sectional drawing has shown joining means, such as a hot-melt-adhesive.
1 to 6 show a pants-type disposable diaper. This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an exterior body 20 that forms a front body F and a back body B, and an interior body 10 that is fixed to and integrated with the inner surface of the exterior body 20. The interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12. In manufacturing, after the back surface of the interior body 10 is joined to the inner surface (upper surface) of the exterior body 20 by a joining means such as a hot melt adhesive, the interior body 10 and the exterior body 20 are the front body F and the back body B. Are folded at the center in the front-rear direction (longitudinal direction), and the side seal portions 21 are formed by joining both sides thereof by heat welding or hot melt adhesive, thereby forming a waist opening and a pair of left and right A pants-type disposable diaper with a leg opening.
　（内装体の構造例）
　内装体１０は、図４～図６に示すように、液透過性トップシート１１と、ポリエチレン等からなる液不透過性シート１２との間に、吸収体１３を介在させた構造を有しており、トップシート１１を透過した排泄液を吸収保持するものである。内装体１０の平面形状は特に限定されないが、図１に示されるようにほぼ長方形とすることが一般的である。 (Structural example of interior body)
As shown in FIGS. 4 to 6, the interior body 10 has a structure in which an absorbent body 13 is interposed between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12 made of polyethylene or the like. In addition, the excretory fluid that has passed through the top sheet 11 is absorbed and held. Although the planar shape of the interior body 10 is not particularly limited, it is generally a rectangular shape as shown in FIG.
　吸収体１３の表側（肌側）を覆う液透過性トップシート１１としては、有孔又は無孔の不織布や多孔性プラスチックシートなどが好適に用いられる。不織布を構成する素材繊維は、ポリエチレン又はポリプロピレン等のオレフィン系、ポリエステル系、ポリアミド系等の合成繊維の他、レーヨンやキュプラ等の再生繊維、綿等の天然繊維とすることができ、スパンレース法、スパンボンド法、サーマルボンド法、メルトブローン法、ニードルパンチ法等の適宜の加工法によって得られた不織布を用いることができる。これらの加工法の内、スパンレース法は柔軟性、ドレープ性に富む点で優れ、サーマルボンド法は嵩高でソフトである点で優れている。液透過性トップシート１１に多数の透孔を形成した場合には、尿などが速やかに吸収されるようになり、ドライタッチ性に優れたものとなる。液透過性トップシート１１は、吸収体１３の側縁部を巻き込んで吸収体１３の裏側まで延在している。 As the liquid-permeable top sheet 11 covering the front side (skin side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, natural fibers such as cotton, and the spunlace method. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable top sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.
　吸収体１３の裏側（非肌当接側）を覆う液不透過性シート１２は、ポリエチレン又はポリプロピレンなどの液不透過性プラスチックシートが用いられるが、近年はムレ防止の点から透湿性を有するものが好適に用いられる。この遮水・透湿性シートは、例えばポリエチレンやポリプロピレン等のオレフィン樹脂中に無機充填材を溶融混練してシートを形成した後、一軸又は二軸方向に延伸することにより得られる微多孔性シートである。 As the liquid-impermeable sheet 12 covering the back side (non-skin contact side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used, but in recent years, it has moisture permeability from the viewpoint of preventing stuffiness. Are preferably used. This water-impervious and moisture-permeable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.
　吸収体１３としては、公知のもの、例えばパルプ繊維の積繊体、セルロースアセテート等のフィラメントの集合体、あるいは不織布を基本とし、必要に応じて高吸収性ポリマーを混合、固着等してなるものを用いることができる。この吸収体１３は、形状及びポリマー保持等のため、必要に応じてクレープ紙等の、液透過性及び液保持性を有する包装シート１４によって包装することができる。
　吸収体１３の形状は、股間部に前後両側よりも幅の狭い括れ部分１３Ｎを有するほぼ砂時計状に形成されているが、長方形状等、適宜の意形状とすることができる。括れ部分１３Ｎの寸法は適宜定めることができるが、括れ部分１３Ｎの前後方向長さはおむつ全長の２０～５０％程度とすることができ、その最も狭い部分の幅は吸収体１３の全幅の４０～６０％程度とすることができる。このような括れ部分１３Ｎを有する場合において、内装体１０の平面形状がほぼ長方形とされていると、内装体１０における吸収体１３の括れ部分１３Ｎと対応する部分に、吸収体１３を有しない余り部分が形成される。 Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. Can be used. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer.
The shape of the absorber 13 is formed in a substantially hourglass shape having a narrowed portion 13N having a narrower width than the front and rear sides in the crotch portion, but may be an appropriate shape such as a rectangular shape. The size of the constricted portion 13N can be determined as appropriate, but the length in the front-rear direction of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion is 40% of the total width of the absorber 13. It can be about 60%. In the case of having such a constricted portion 13N, if the planar shape of the interior body 10 is substantially rectangular, the remainder of the interior body 10 that does not have the absorber 13 in the portion corresponding to the constricted portion 13N of the absorber 13 A part is formed.
　内装体１０の両側部には脚周りにフィットする立体ギャザーＢＳが形成されている。この立体ギャザーＢＳは、図５及び図６に示されるように、内装体の裏面の側部に固定された固定部と、この固定部から内装体の側方を経て内装体の表面の側部まで延在する本体部と、本体部の前後端部が倒伏状態で内装体の表面の側部に固定されて形成された倒伏部分と、この倒伏部分間が非固定とされて形成された自由部分とが、折り返しによって二重シートとしたギャザー不織布１５により形成されている。 3D gather BS that fits around the legs is formed on both sides of the interior body 10. As shown in FIGS. 5 and 6, the three-dimensional gather BS includes a fixed portion fixed to a side portion on the back surface of the interior body, and a side portion on the surface of the interior body from the fixed portion to the side of the interior body. The body part that extends to the front, the front and rear ends of the body part in a lying state, and the lying part that is fixed to the side of the surface of the interior body, and the freedom part that is formed with this lying part being unfixed The part is formed of a gathered nonwoven fabric 15 that is turned into a double sheet by folding.
　また、二重シート間には、自由部分の先端部等に細長状ギャザー弾性部材１６が配設されている。ギャザー弾性部材１６は、製品状態において図５に二点鎖線で示すように、弾性伸縮力により自由部分を起立させて立体ギャザーＢＳを形成するためのものである。 Also, between the double sheets, an elongated gather elastic member 16 is disposed at the free end of the free portion. The gather elastic member 16 is for forming a three-dimensional gather BS by raising a free part by elastic stretching force as shown by a two-dot chain line in FIG. 5 in the product state.
　液不透過性シート１２は、液透過性トップシート１１とともに吸収体１３の幅方向両側で裏側に折り返されている。この液不透過性シート１２としては、排便や尿などの褐色が出ないように不透明のものを用いるのが望ましい。不透明化としては、プラスチック中に、炭酸カルシウム、酸化チタン、酸化亜鉛、ホワイトカーボン、クレイ、タルク、硫酸バリウムなどの顔料や充填材を内添してフィルム化したものが好適に使用される。 The liquid-impermeable sheet 12 is folded back on the both sides in the width direction of the absorber 13 together with the liquid-permeable top sheet 11. As this liquid-impermeable sheet 12, it is desirable to use an opaque sheet so that brown color such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.
　ギャザー弾性部材１６としては、通常使用されるスチレン系ゴム、オレフィン系ゴム、ウレタン系ゴム、エステル系ゴム、ポリウレタン、ポリエチレン、ポリスチレン、スチレンブタジエン、シリコン、ポリエステル等の素材を用いることができる。また、外側から見え難くするため、太さは９２５ｄｔｅｘ以下、テンションは１５０～３５０％、間隔は７．０ｍｍ以下として配設するのがよい。なお、ギャザー弾性部材１６としては、図示形態のような糸状の他、ある程度の幅を有するテープ状のものを用いることもできる。 As the gather elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester and the like that are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. The gathered elastic member 16 may be a tape-like member having a certain width in addition to the thread-like shape shown in the figure.
　前述のギャザー不織布１５を構成する素材繊維も液透過性トップシート１１と同様に、ポリエチレン又はポリプロピレン等のオレフィン系、ポリエステル系、アミド系等の合成繊維の他、レーヨンやキュプラ等の再生繊維、綿等の天然繊維とすることができ、スパンボンド法、サーマルボンド法、メルトブローン法、ニードルパンチ法等の適宜の加工方法に得られた不織布を用いることができるが、特にはムレを防止するために坪量を抑えて通気性に優れた不織布を用いるのがよい。さらにギャザー不織布１５については、尿などの透過を防止するとともに、カブレを防止しかつ肌への感触性（ドライ感）を高めるために、シリコン系、パラフィン金属系、アルキルクロミッククロイド系撥水剤などをコーティングした撥水処理不織布を用いるのが望ましい。 In the same manner as the liquid-permeable top sheet 11, the material fibers constituting the gathered nonwoven fabric 15 are olefin-based, polyester-based, amide-based synthetic fibers such as polyethylene or polypropylene, recycled fibers such as rayon and cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.
　図３に示すように、内装体１０はその裏面が、内外固定領域１０Ｂ（斜線領域）において、外装体２０の内面に対してホットメルト接着剤等により固定される。この内外固定領域１０Ｂは、一方の無吸収体側部１７から他方の無吸収体側部１７にわたる幅で、無吸収体側部１７の前後両側にわたり延在される。内外固定領域１０Ｂの側縁は、無吸収体側部１７の幅方向中間より側方に位置していることが好ましく、特に内装体１０の幅方向のほぼ全体、及び前後方向のほぼ全体にわたり外装体２０に固定されているとより好ましい。 As shown in FIG. 3, the back surface of the interior body 10 is fixed to the inner surface of the exterior body 20 with a hot melt adhesive or the like in the inner and outer fixing regions 10 </ b> B (shaded region). This inner / outer fixed region 10 </ b> B extends across the front and rear sides of the non-absorbent body side portion 17 with a width extending from one non-absorbent body side portion 17 to the other non-absorbent body side portion 17. The side edge of the inner / outer fixing region 10B is preferably located laterally from the middle in the width direction of the non-absorbent body side portion 17, and in particular, the exterior body over almost the whole width direction of the interior body 10 and almost the whole front and rear direction. More preferably, it is fixed to 20.
　（外装体の構造例）
　外装体２０は吸収体１３の側縁より側方まで延在されている。この限りで、外装体２０は図示形態のように股間部において外装体２０の側縁が内装体１０の側縁より幅方向中央側に位置していても、また幅方向外側に位置していても良い。また、外装体２０は、サイドシール部２１と対応する前後方向範囲である胴周り部Ｔと、前身頃Ｆの胴周り部Ｔ及び後身頃Ｂの胴周り部Ｔの間の前後方向範囲である中間部Ｌとを有する。そして、図示形態の外装体２０では、その中間部Ｌの前後方向中間を除いて、図２及び図４～図６に示されるように、第１シート層２０Ａ及び第２シート層２０Ｂの間に弾性フィルム３０が積層されるとともに、図７に示されるように、第１シート層２０Ａ及び第２シート層２０Ｂが、間隔を空けて配列された多数のシート接合部４０で弾性フィルム３０を貫通する貫通孔３１を通じて接合された、伸縮方向が幅方向とされた弾性フィルム伸縮構造２０Ｘを有している。第１シート層２０Ａ及び第２シート層２０Ｂは、弾性フィルム３０の貫通孔３１を通じてではなく、弾性フィルム３０を介して間接的に接合されていても良い。外装体２０の平面形状は、中間部Ｌの幅方向両側縁がそれぞれレッグ開口を形成するように凹状の脚周りライン２９により形成されており、全体として擬似砂時計形状をなしている。外装体２０は、前後に二分割し、両者が股間部で前後方向に離間するように配置しても良い。 (External body structure example)
The exterior body 20 extends from the side edge of the absorber 13 to the side. As long as this is the case, the exterior body 20 is located in the crotch portion even if the side edge of the exterior body 20 is located on the center side in the width direction from the side edge of the interior body 10 or on the outer side in the width direction. Also good. Further, the exterior body 20 is a front-rear direction range between a waistline T corresponding to the side seal portion 21 and a front-rear range, a waistline T of the front body F, and a waistline T of the back body B. And an intermediate portion L. And in the exterior body 20 of the illustrated form, except for the middle in the front-rear direction of the intermediate portion L, as shown in FIGS. 2 and 4 to 6, it is between the first sheet layer 20A and the second sheet layer 20B. While the elastic film 30 is laminated, as shown in FIG. 7, the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B penetrate the elastic film 30 with a large number of sheet joint portions 40 arranged at intervals. It has the elastic film expansion-contraction structure 20X joined through the through-hole 31, and the expansion-contraction direction was made into the width direction. The first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B may be indirectly joined through the elastic film 30 instead of through the through hole 31 of the elastic film 30. The planar shape of the exterior body 20 is formed by concave leg-around lines 29 so that both side edges of the intermediate portion L in the width direction form leg openings, respectively, and has a pseudo hourglass shape as a whole. The exterior body 20 may be divided into two parts in the front-rear direction so that both are separated in the front-rear direction at the crotch part.
　図１及び図２に示す形態は、弾性フィルム伸縮構造２０Ｘがウエスト端部領域２３まで延在されている形態であるが、ウエスト端部領域２３に弾性フィルム伸縮構造２０Ｘを用いると、ウエスト端部領域２３の締め付けが不十分になる等、必要に応じて、図１５及び図１６に示すようにウエスト端部領域２３には弾性フィルム伸縮構造２０Ｘを設けずに、従来の細長状のウエスト部弾性部材２４による伸縮構造２０Ｘを設けることもできる。ウエスト部弾性部材２４は、前後方向に間隔をおいて配置された複数の糸ゴム等の細長状弾性部材であり、身体の胴周りを締め付けるように伸縮力を与えるものである。ウエスト部弾性部材２４は、間隔を密にして実質的に一束として配置されるのではなく、所定の伸縮ゾーンを形成するように３～８ｍｍ程度の間隔を空けて、３本以上、好ましくは５本以上配置される。ウエスト部弾性部材２４の固定時の伸長率は適宜定めることができるが、通常の成人用の場合２３０～３２０％程度とすることができる。ウエスト部弾性部材２４は、図示例では糸ゴムを用いたが、例えば平ゴム等、他の細長状の伸縮部材を用いても良い。 The form shown in FIGS. 1 and 2 is a form in which the elastic film stretchable structure 20X extends to the waist end region 23, but when the elastic film stretchable structure 20X is used for the waist end region 23, the waist end portion is used. If necessary, as shown in FIGS. 15 and 16, the waist end region 23 is not provided with the elastic film stretchable structure 20X as shown in FIGS. A telescopic structure 20 </ b> X by the member 24 can also be provided. The waist elastic member 24 is an elongated elastic member such as a plurality of thread rubbers arranged at intervals in the front-rear direction, and gives an elastic force so as to tighten around the body torso. The waist elastic members 24 are not arranged substantially as a single bundle with a close spacing, but with a spacing of about 3 to 8 mm so as to form a predetermined stretch zone, preferably three or more, preferably Five or more are arranged. The elongation rate at the time of fixing the waist elastic member 24 can be determined as appropriate, but can be about 230 to 320% for a normal adult. For the waist elastic member 24, thread rubber is used in the illustrated example, but other elongated elastic members such as flat rubber may be used.
　他の形態としては、図示しないが、前身頃Ｆの胴周り部Ｔと後身頃Ｂの胴周り部Ｔとの間の中間部Ｌには弾性フィルム伸縮構造２０Ｘを設けない形態としたり、前身頃Ｆの胴周り部Ｔ内から中間部Ｌを経て後身頃Ｂの胴周り部Ｔ内まで前後方向に連続的に伸縮構造２０Ｘを設けたり、前身頃Ｆ及び後身頃Ｂのいずれか一方にのみ弾性フィルム伸縮構造２０Ｘを設けたりすることも可能である。 As other forms, although not shown in the figure, the middle part L between the waist part T of the front body F and the waist part T of the back body B is not provided with an elastic film stretchable structure 20X. A stretchable structure 20X is continuously provided in the front-rear direction from the inside of the waist T of the F to the inside of the waist T of the back body B through the intermediate part L, or only one of the front body F and the back body B is elastic. It is also possible to provide a film stretchable structure 20X.
　個々のシート接合部４０及び貫通孔３１の自然長状態での形状は、適宜定めることができるが、真円形（図７、図８参照）、楕円形、三角形、長方形（図９～図１２参照）、ひし形（図１３（ｂ）参照）等の多角形、あるいは凸レンズ形（図１３（ａ）参照）、凹レンズ形（図１３（ｃ）参照）、星形、雲形等、任意の形状とすることができる。個々のシート接合部の寸法は特に限定されないが、最大長さは０．５～３．０ｍｍ、特に０．７～１．１ｍｍとするのが好ましく、最大幅４０ｘは０．１～３．０ｍｍ、特に伸縮方向と直交する方向に長い形状の場合には０．１～１．１ｍｍとするのが好ましい。 The shapes of the individual sheet joint portions 40 and the through-holes 31 in the natural length state can be determined as appropriate, but are perfectly round (see FIGS. 7 and 8), oval, triangle, and rectangle (see FIGS. 9 to 12). ), Rhombus (see FIG. 13B), etc., or convex lens shape (see FIG. 13A), concave lens shape (see FIG. 13C), star shape, cloud shape, etc. be able to. The dimensions of the individual sheet joints are not particularly limited, but the maximum length is preferably 0.5 to 3.0 mm, particularly preferably 0.7 to 1.1 mm, and the maximum width 40x is 0.1 to 3.0 mm. In particular, in the case of a shape that is long in the direction orthogonal to the expansion / contraction direction, the thickness is preferably 0.1 to 1.1 mm.
　個々のシート接合部４０の大きさは、適宜定めれば良いが、大きすぎるとシート接合部４０の硬さが感触に及ぼす影響が大きくなり、小さすぎると接合面積が少なく資材同士が十分に接着できなくなるため、通常の場合、個々のシート接合部４０の面積は０．１４～３．５ｍｍ2程度とすることが好ましい。個々の貫通孔３１の開口の面積は、貫通孔３１を介してシート接合部が形成されるためシート接合部以上であれば良いが、シート接合部の面積の１～１．５倍程度とすることが好ましい。なお、貫通孔３１の開口の面積は、弾性フィルム３０単独の状態ではなく第１シート層２０Ａ及び第２シート層２０Ｂと一体化した状態で、かつ自然長の状態における値を意味し、貫通孔３１の開口の面積が、弾性フィルム３０の表と裏で異なる等、厚み方向に均一でない場合には最小値を意味する。 The size of each sheet bonding portion 40 may be determined as appropriate. However, if the size is too large, the hardness of the sheet bonding portion 40 has an effect on the touch. If the size is too small, the bonding area is small and the materials are sufficiently bonded to each other. In general, the area of each sheet joint portion 40 is preferably about 0.14 to 3.5 mm 2 because it cannot be performed. The area of the opening of each through hole 31 may be equal to or larger than the sheet joint portion because the sheet joint portion is formed through the through hole 31, but is about 1 to 1.5 times the area of the sheet joint portion. It is preferable. In addition, the area of the opening of the through-hole 31 means a value in a state of being integrated with the first sheet layer 20A and the second sheet layer 20B, not in the state of the elastic film 30 alone, and in a natural length state. When the area of the opening 31 is not uniform in the thickness direction, such as when the elastic film 30 is different from the front and back, it means the minimum value.
　シート接合部４０及び貫通孔３１の平面配列は適宜定めることができるが、規則的に繰り返される平面配列が好ましく、図２１（ａ）に示すような斜方格子状や、図２１（ｂ）に示すような六角格子状（これらは千鳥状ともいわれる）、図２１（ｃ）に示すような正方格子状、図２１（ｄ）に示すような矩形格子状、図２１（ｅ）に示すような平行体格子（図示のように、多数の平行な斜め方向の列の群が互いに交差するように２群設けられる形態）状等（これらが伸縮方向に対して９０度未満の角度で傾斜したものを含む）のように規則的に繰り返されるものの他、シート接合部４０の群（群単位の配列は規則的でも不規則でも良く、模様や文字状等でも良い）が規則的に繰り返されるものとすることもできる。 The planar arrangement of the sheet joint portion 40 and the through-holes 31 can be determined as appropriate, but a regularly repeated planar arrangement is preferable, and an oblique lattice shape as shown in FIG. Hexagonal lattice shape as shown (these are also called zigzag shapes), square lattice shape as shown in FIG. 21 (c), rectangular lattice shape as shown in FIG. 21 (d), as shown in FIG. 21 (e) Parallel body lattice (as shown in the figure, two groups are provided so that a large number of groups of parallel diagonal rows intersect each other), etc. (these are inclined at an angle of less than 90 degrees with respect to the expansion and contraction direction And a group of sheet joint portions 40 (group unit arrangement may be regular or irregular, and may be a pattern or a letter shape) is regularly repeated. You can also
　シート接合部４０における第１シート層２０Ａ及び第２シート層２０Ｂの接合は、弾性フィルム３０に形成された貫通孔３１を通じて接合される。この場合、少なくともシート接合部４０における第１シート層２０Ａ及び第２シート層２０Ｂ間以外では弾性フィルム３０と接合されていないことが望ましい。 The bonding of the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B in the sheet bonding portion 40 is performed through the through hole 31 formed in the elastic film 30. In this case, it is desirable that the elastic film 30 is not bonded at least except between the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40.
　シート接合部４０における第１シート層２０Ａ及び第２シート層２０Ｂの接合手段は特に限定されない。例えば、接合部４０における第１シート層２０Ａ及び第２シート層２０Ｂの接合はホットメルト接着剤によりなされていても、ヒートシールや超音波シール等の素材溶着による接合手段によりなされていても良い。 The joining means of the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40 is not particularly limited. For example, the joining of the first sheet layer 20A and the second sheet layer 20B in the joining portion 40 may be performed by a hot melt adhesive, or may be performed by a joining means such as heat sealing or ultrasonic sealing.
　シート接合部４０において第１シート層２０Ａ及び第２シート層２０Ｂが貫通孔３１を通じて接合される場合、シート接合部４０が素材溶着により形成される形態は、シート接合部４０における第１シート層２０Ａ及び第２シート層２０Ｂの少なくとも一方の大部分又は一部の溶融固化物２０ｍのみにより第１シート層２０Ａ及び第２シート層２０Ｂが接合される第１溶着形態（図１７（ａ）参照）、シート接合部４０における弾性フィルム３０の全部若しくは大部分又は一部の溶融固化物３０ｍのみにより第１シート層２０Ａ及び第２シート層２０Ｂが接合される第２溶着形態（図１７（ｂ）参照）、及びこれらの両者が組み合わさった第３溶着形態（図１７（ｃ）参照）のいずれでも良いが、第２、第３溶着形態が好ましい。特に好ましいのは、第１シート層２０Ａ及び第２シート層２０Ｂの一部の溶融固化物２０ｍと、シート接合部４０における弾性フィルム３０の全部若しくは大部分の溶融固化物３０ｍとにより第１シート層２０Ａ及び第２シート層２０Ｂが接合される形態である。なお、図１９（ｂ）に示される第３溶着形態では、黒色に写っている第１シート層２０Ａ又は第２シート層２０Ｂの繊維溶融固化物２０ｍ間に、白色に写っている弾性フィルム３０の溶融固化物３０ｍが見られるのに対して、図１９（ａ）に示される第１溶着形態では、第１シート層２０Ａ又は第２シート層２０Ｂの繊維溶融固化物２０ｍ間に弾性フィルムの溶融固化物は見られない（白色部分は繊維溶融固化物２０ｍの境界と、繊維溶融固化物２０ｍの乱反射である）。 When the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B are bonded through the through hole 31 in the sheet bonding portion 40, the form in which the sheet bonding portion 40 is formed by material welding is the first sheet layer 20 </ b> A in the sheet bonding portion 40. And a first welding form in which the first sheet layer 20A and the second sheet layer 20B are joined only by the majority or part of the molten solidified material 20m of at least one of the second sheet layer 20B (see FIG. 17A), The second welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined by all or most of the elastic film 30 in the sheet joining portion 40 or only a part of the melt-solidified material 30m (see FIG. 17B). , And a third welding form in which both of these are combined (see FIG. 17 (c)), but the second and third welding forms are preferable. Particularly preferably, the first sheet layer is composed of a part of the melt-solidified material 20m of the first sheet layer 20A and the second sheet layer 20B and the whole or most of the melt-solidified material 30m of the elastic film 30 in the sheet joint portion 40. 20A and the second sheet layer 20B are joined together. In addition, in the 3rd welding form shown by FIG.19 (b), between the fiber fusion | melting solidified materials 20m of the 1st sheet layer 20A or the 2nd sheet layer 20B which are reflected in black, the elastic film 30 which is reflected in white In contrast to the melted and solidified material 30m, in the first welding form shown in FIG. 19A, the elastic film is melted and solidified between the fiber melted and solidified materials 20m of the first sheet layer 20A or the second sheet layer 20B. No object is seen (the white part is the boundary of the fiber melt-solidified product 20m and the irregular reflection of the fiber melt-solidified product 20m).
　第１接着形態や第３接着形態のように、第１シート層２０Ａ及び第２シート層２０Ｂの少なくとも一方の大部分又は一部の溶融固化物２０ｍを接着剤として第１シート層２０Ａ及び第２シート層２０Ｂを接合する場合、第１シート層２０Ａ及び第２シート層２０Ｂの一部は溶融しない方がシート接合部４０が硬質化しないため好ましい。なお、第１シート層２０Ａ及び第２シート層２０Ｂが不織布であるときには、第１シート層２０Ａ及び第２シート層２０Ｂの一部が溶融しないことには、シート接合部４０の全繊維について芯（複合繊維における芯だけでなく単成分繊維の中心部分を含む）は残るがその周囲部分（複合繊維における鞘だけでなく単成分繊維の表層側の部分を含む）は溶融する形態や、一部の繊維は全く溶融しないが、残りの繊維は全部が溶融する又は芯は残るがその周囲部分は溶融する形態を含む。 As in the first adhesive form and the third adhesive form, the first sheet layer 20A and the second sheet 20A and the second sheet 20A and the second sheet layer 20B are used by using at least one of the first sheet layer 20A and the second sheet layer 20B as the adhesive. When joining the sheet layer 20B, it is preferable not to melt part of the first sheet layer 20A and the second sheet layer 20B because the sheet joining part 40 does not harden. Note that when the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, a part of the first sheet layer 20A and the second sheet layer 20B does not melt. The composite fiber contains not only the core but also the central part of the single component fiber), but the surrounding part (including not only the sheath but also the surface part of the single component fiber of the composite fiber) melts, The fibers do not melt at all, but the remaining fibers either completely melt or the core remains but the surrounding portion includes a molten form.
　第２溶着形態及び第３溶着形態のように、弾性フィルム３０の溶融固化物３０ｍを接着剤として第１シート層２０Ａ及び第２シート層２０Ｂを接合すると、剥離強度が高いものとなる。第２溶着形態では、第１シート層２０Ａ及び第２シート層２０Ｂの少なくとも一方の融点が弾性フィルム３０の融点及びシート接合部４０形成時の加熱温度よりも高い条件下で、第１シート層２０Ａ及び第２シート層２０Ｂ間に弾性フィルム３０を挟み、シート接合部４０となる部位を加圧・加熱し、弾性フィルム３０のみを溶融することにより製造することができる。一方、第３溶着形態では、第１シート層２０Ａ及び第２シート層２０Ｂの少なくとも一方の融点が弾性フィルム３０の融点よりも高い条件下で、第１シート層２０Ａ及び第２シート層２０Ｂ間に弾性フィルム３０を挟み、シート接合部４０となる部位を加圧・加熱し、第１シート層２０Ａ及び第２シート層２０Ｂの少なくとも一方と弾性フィルム３０とを溶融することにより製造することができる。このような観点から、弾性フィルム３０の融点は８０～１４５℃程度のものが好ましく、第１シート層２０Ａ及び第２シート層２０Ｂの融点は８５～１９０℃程度、特に１５０～１９０℃程度のものが好ましく、第１シート層２０Ａ及び第２シート層２０Ｂの融点と弾性フィルム３０の融点との差は６０～９０℃程度であるのが好ましい。また、加熱温度は１００～１５０℃程度とするのが好ましい。 When the first sheet layer 20A and the second sheet layer 20B are joined using the melted and solidified material 30m of the elastic film 30 as an adhesive as in the second welding form and the third welding form, the peel strength becomes high. In the second welding mode, the first sheet layer 20A and the second sheet layer 20B have a melting point that is higher than the melting point of the elastic film 30 and the heating temperature when forming the sheet joint 40. In addition, the elastic film 30 is sandwiched between the second sheet layers 20 </ b> B, the portion to be the sheet bonding portion 40 is pressurized and heated, and only the elastic film 30 is melted. On the other hand, in the third welding mode, the first sheet layer 20A and the second sheet layer 20B are between the first sheet layer 20A and the second sheet layer 20B under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic film 30. It can be manufactured by sandwiching the elastic film 30, pressurizing and heating a portion to be the sheet bonding portion 40, and melting at least one of the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B and the elastic film 30. From this point of view, the elastic film 30 preferably has a melting point of about 80 to 145 ° C., and the first sheet layer 20A and the second sheet layer 20B have melting points of about 85 to 190 ° C., particularly about 150 to 190 ° C. The difference between the melting point of the first sheet layer 20A and the second sheet layer 20B and the melting point of the elastic film 30 is preferably about 60 to 90 ° C. The heating temperature is preferably about 100 to 150 ° C.
　第２溶着形態及び第３溶着形態では、第１シート層２０Ａ及び第２シート層２０Ｂが不織布であるときには、弾性フィルム３０の溶融固化物３０ｍは、図１８（ｃ）に示すようにシート接合部４０における第１シート層２０Ａ及び第２シート層２０Ｂの厚み方向全体にわたり繊維間に浸透していても良いが、図１７（ｂ）（ｃ）及び図１８（ａ）に示すように厚み方向中間まで繊維間に浸透する形態、又は図１８（ｂ）に示すように第１シート層２０Ａ及び第２シート層２０Ｂの繊維間にほとんど浸透しない形態の方が、シート接合部４０の柔軟性が高いものとなる。 In the second welding mode and the third welding mode, when the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, the melt-solidified product 30m of the elastic film 30 is a sheet joint portion as shown in FIG. 40 may penetrate between the fibers in the entire thickness direction of the first sheet layer 20A and the second sheet layer 20B, but as shown in FIGS. 17 (b) (c) and 18 (a), it is intermediate in the thickness direction. The form that penetrates between the fibers up to or the form that hardly penetrates between the fibers of the first sheet layer 20A and the second sheet layer 20B as shown in FIG. It will be a thing.
　図２０は、第２溶着形態及び第３溶着形態を形成するのに好適な超音波シール装置の例を示している。この超音波シール装置では、シート接合部４０の形成に際して、外面にシート接合部４０のパターンで形成した突起部６０ａを有するアンビルロール６０と超音波ホーン６１との間に、第１シート層２０Ａ、弾性フィルム３０及び第２シート層２０Ｂを送り込む。この際、例えば上流側の弾性フィルム３０の送り込み駆動ロール６２Ａ及びニップロール６２Ｂによる送り込み移送速度を、アンビルロール６０及び超音波ホーン６１以降の移送速度よりも遅くすることにより、送り込み駆動ロール６２Ａ及びニップロール６２Ｂによるニップ位置からアンビルロール６０及び超音波ホーン６１によるシール位置までの経路で、弾性フィルム３０をＭＤ方向（マシン方向、流れ方向）に所定の伸長率まで伸長する。この弾性フィルム３０の伸長率は、アンビルロール６０及び送り込み駆動ロール６２の速度差を選択することにより設定することができ、例えば３００％～５００％程度とすることができる。６３はガイドローラである。アンビルロール６０と超音波ホーン６１との間に送り込まれた、第１シート層２０Ａ、弾性フィルム３０及び第２シート層２０Ｂは、この順に積層した状態で、突起部６０ａと超音波ホーン６１との間で加圧しつつ、超音波ホーン６１の超音波振動エネルギーにより加熱し、弾性フィルム３０のみを溶融するか、又は第１シート層２０Ａ及び第２シート層２０Ｂの少なくとも一方と弾性フィルム３０とを溶融することによって、弾性フィルム３０に貫通孔３１を形成するのと同時に、その貫通孔３１を通じて第１シート層２０Ａ及び第２シート層２０Ｂを接合する。したがって、この場合にはアンビルロール６０の突起部６０ａの大きさ、形状、離間間隔、ロール長方向及びロール周方向の配置パターンなどを選定することにより、シート接合部４０の面積率を選択することができる。 FIG. 20 shows an example of an ultrasonic sealing device suitable for forming the second welding form and the third welding form. In this ultrasonic sealing apparatus, when the sheet bonding portion 40 is formed, the first sheet layer 20A, between the anvil roll 60 and the ultrasonic horn 61, each having a projection 60a formed in the pattern of the sheet bonding portion 40 on the outer surface, The elastic film 30 and the second sheet layer 20B are fed. At this time, for example, the feeding drive speed of the elastic film 30 on the upstream side by the feeding drive roll 62A and the nip roll 62B is made slower than the feeding speed after the anvil roll 60 and the ultrasonic horn 61, thereby bringing the feeding drive roll 62A and the nip roll 62B. The elastic film 30 is stretched in the MD direction (machine direction, flow direction) to a predetermined stretch rate through the path from the nip position due to the above to the seal position due to the anvil roll 60 and the ultrasonic horn 61. The stretch rate of the elastic film 30 can be set by selecting the speed difference between the anvil roll 60 and the feed drive roll 62, and can be set to about 300% to 500%, for example. 63 is a guide roller. The first sheet layer 20 </ b> A, the elastic film 30, and the second sheet layer 20 </ b> B fed between the anvil roll 60 and the ultrasonic horn 61 are stacked in this order, and the protrusion 60 a and the ultrasonic horn 61 are While being pressurized, the ultrasonic horn 61 is heated by ultrasonic vibration energy to melt only the elastic film 30 or at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic film 30 are melted. By doing so, the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B are joined through the through-hole 31 at the same time as the through-hole 31 is formed in the elastic film 30. Therefore, in this case, by selecting the size, shape, separation interval, arrangement pattern in the roll length direction and roll circumferential direction, etc., of the projections 60a of the anvil roll 60, the area ratio of the sheet joining portion 40 is selected. Can do.
　貫通孔３１が形成される理由は必ずしも明確ではないが、弾性フィルム３０におけるアンビルロール６０の突起部６０ａと対応する部分が溶融して周囲から離脱することにより開孔するものと考えられる。この際、弾性フィルム３０における、伸縮方向に並ぶ隣接貫通孔３１の間の部分は、図７（ａ）、図９（ａ）及び図１１（ａ）に示すように、貫通孔３１により伸縮方向両側の部分から切断され、収縮方向両側の支えを失うことになるため、収縮方向と直交する方向の連続性を保ちうる範囲で、伸縮方向と直交する方向の中央側ほど伸縮方向中央側に釣り合うまで収縮し、貫通孔３１が伸縮方向に拡大する。そして、後述する伸縮領域８０のように弾性フィルム３０が伸縮方向に沿って直線的に連続する部分が残るパターンでシート接合部４０を形成すると、図７（ａ）及び図９（ａ）に示すように、個別の製品に切断すること等により自然長状態まで収縮するときに、貫通孔３１の拡大部分の伸縮方向の長さは、貫通孔３１とシート接合部４０との間に隙間ができなくなるまで収縮することとなる。一方、後述する非伸縮領域７０のように弾性フィルム３０が伸縮方向に沿って直線的に連続する部分がないパターンでシート接合部４０を形成すると、図１１（ａ）に示すように、個別の製品に切断すること等により自然長状態まで収縮するときにほとんど収縮しないため、貫通孔３１とシート接合部４０との間に隙間が大きく残されることとなる。 The reason why the through-hole 31 is formed is not necessarily clear, but it is considered that the hole corresponding to the protrusion 60a of the anvil roll 60 in the elastic film 30 is melted and separated from the surroundings. At this time, the portion of the elastic film 30 between the adjacent through holes 31 aligned in the expansion / contraction direction is expanded / contracted by the through holes 31 as shown in FIGS. 7A, 9A, and 11A. Since it is cut from both sides and loses the support on both sides in the contraction direction, the central side in the direction orthogonal to the expansion / contraction direction is balanced with the central side in the expansion / contraction direction within a range that can maintain continuity in the direction orthogonal to the contraction direction. The through hole 31 expands in the expansion / contraction direction. And when the sheet | seat junction part 40 is formed in the pattern in which the part which the elastic film 30 continues linearly along the expansion-contraction direction like the expansion-contraction area | region 80 mentioned later is shown to Fig.7 (a) and FIG.9 (a). Thus, when contracting to a natural length state by cutting into individual products, the length in the expansion / contraction direction of the enlarged portion of the through hole 31 creates a gap between the through hole 31 and the sheet joining portion 40. It will shrink until it runs out. On the other hand, when the sheet bonding portion 40 is formed in a pattern in which the elastic film 30 does not have a linearly continuous portion along the stretching direction as in a non-stretchable region 70 described later, as shown in FIG. Since it hardly shrinks when it is shrunk to a natural length state by cutting into a product or the like, a large gap is left between the through hole 31 and the sheet bonding portion 40.
　第１シート層２０Ａ及び第２シート層２０Ｂの構成材は、シート状のものであれば特に限定無く使用できるが、通気性及び柔軟性の観点から不織布を用いることが好ましい。不織布は、その原料繊維が何であるかは特に限定されない。例えば、ポリエチレンやポリプロピレン等のオレフィン系、ポリエステル系、ポリアミド系等の合成繊維、レーヨンやキュプラ等の再生繊維、綿等の天然繊維などや、これらから二種以上が使用された混合繊維、複合繊維などを例示することができる。さらに、不織布は、どのような加工によって製造されたものであってもよい。加工方法としては、公知の方法、例えば、スパンレース法、スパンボンド法、サーマルボンド法、メルトブローン法、ニードルパンチ法、エアスルー法、ポイントボンド法等を例示することができる。不織布を用いる場合、その目付けは１２～２０ｇ／ｍ2程度とするのが好ましい。また、第１シート層２０Ａ及び第２シート層２０Ｂの一部又は全部は、一枚の資材を折り返して対向させた一対の層であっても良い。例えば、図示形態のように、ウエスト端部領域２３では、外側に位置する構成材を第２シート層２０Ｂとし、かつそのウエスト開口縁で内面側に折り返してなる折り返し部分２０Ｃを第１シート層２０Ａとして、その間に弾性フィルム３０を介在させるとともに、それ以外の部分では内側に位置する構成材を第１シート層２０Ａとし、外側に位置する構成材を第２シート層２０Ｂとして、その間に弾性フィルム３０を介在させることができる。もちろん、前後方向の全体にわたり第１シート層２０Ａの構成材及び第２シート層２０Ｂの構成材を個別に設け、構成材を折り返しすることなく、第１シート層２０Ａの構成材及び第２シート層２０Ｂの構成材間に弾性フィルム３０を介在させることもできる。 The constituent material of the first sheet layer 20A and the second sheet layer 20B can be used without particular limitation as long as it is a sheet, but it is preferable to use a nonwoven fabric from the viewpoint of air permeability and flexibility. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, the basis weight is preferably about 12 to 20 g / m 2 . Moreover, a part or all of the first sheet layer 20A and the second sheet layer 20B may be a pair of layers in which one material is folded and faced. For example, as shown in the figure, in the waist end region 23, the constituent material located outside is the second sheet layer 20B, and the folded portion 20C that is folded back to the inner surface side at the waist opening edge is the first sheet layer 20A. In addition, the elastic film 30 is interposed therebetween, and in the other portions, the constituent material positioned inside is the first sheet layer 20A, and the constituent material positioned outside is the second sheet layer 20B, and the elastic film 30 is interposed therebetween. Can be interposed. Of course, the constituent material of the first sheet layer 20A and the constituent material of the second sheet layer 20B are individually provided over the entire front-rear direction, and the constituent material of the first sheet layer 20A and the second sheet layer are not folded back. The elastic film 30 can also be interposed between the constituent materials of 20B.
　弾性フィルム３０は特に限定されるものではなく、それ自体弾性を有する熱可塑性樹脂フィルムであれば、無孔のものの他、通気のために多数の孔やスリットが形成されたものも用いることができる。特に、幅方向（伸縮方向、ＭＤ方向）における引張強度が８～２５Ｎ／３５ｍｍ、前後方向（伸縮方向と直交する方向、ＣＤ方向）における引張強度が５～２０Ｎ／３５ｍｍ、幅方向における引張伸度が４５０～１０５０％、及び前後方向における引張伸度が４５０～１４００％の弾性フィルム３０であると好ましい。弾性フィルム３０の厚みは特に限定されないが、２０～４０μｍ程度であるのが好ましい。 The elastic film 30 is not particularly limited, and as long as it is a thermoplastic resin film having elasticity per se, a film having a large number of holes and slits for ventilation can also be used. . In particular, the tensile strength in the width direction (stretching direction, MD direction) is 8 to 25 N / 35 mm, the tensile strength in the front-rear direction (direction perpendicular to the stretching direction, CD direction) is 5 to 20 N / 35 mm, and the tensile elongation in the width direction. The elastic film 30 is preferably 450 to 1050% and the tensile elongation in the front-rear direction is 450 to 1400%. The thickness of the elastic film 30 is not particularly limited, but is preferably about 20 to 40 μm.
　（伸縮領域及び非伸縮領域）
　外装体２０における弾性フィルム伸縮構造２０Ｘを有する領域は、非伸縮領域７０と、この非伸縮領域７０の少なくとも幅方向一方側に設けられた、幅方向に伸縮可能な伸縮領域８０とを有している。これら伸縮領域８０及び非伸縮領域７０の配置は適宜定めることができる。本実施形態のようなパンツタイプ使い捨ておむつの外装体２０の場合、吸収体１３と重なる部分は伸縮が不要な領域であるため、図示形態のように、吸収体１３と重なる部分の一部又は全部（内外固定領域１０Ｂのほぼ全体を含むことが望ましい）を非伸縮領域７０とするのは好ましい。もちろん、吸収体１３と重なる領域からその幅方向又は前後方向に位置する吸収体１３と重ならない領域にかけて非伸縮領域７０を設けることもでき、吸収体１３と重ならない領域にのみ非伸縮領域７０を設けることもる。 (Stretchable area and non-stretchable area)
The region having the elastic film stretchable structure 20 </ b> X in the exterior body 20 includes a non-stretchable region 70 and a stretchable region 80 that is provided on at least one side in the width direction of the non-stretchable region 70 and can be stretched in the width direction. Yes. The arrangement of the stretchable region 80 and the non-stretchable region 70 can be determined as appropriate. In the case of the exterior body 20 of the pants-type disposable diaper as in the present embodiment, the portion overlapping the absorber 13 is an area that does not need to be expanded and contracted, and therefore, part or all of the portion overlapping the absorber 13 as illustrated. It is preferable to make the non-stretchable region 70 (desirably including almost the entire inner and outer fixed region 10B). Of course, the non-stretchable region 70 can be provided from the region overlapping with the absorber 13 to the region not overlapping with the absorber 13 positioned in the width direction or the front-rear direction, and the non-stretchable region 70 is provided only in the region not overlapping with the absorber 13. May be provided.
　（伸縮領域）
　伸縮領域８０では、弾性フィルム３０が幅方向に沿って直線的に連続する部分３２を有しており、かつ弾性フィルム３０の収縮力により幅方向に収縮しているとともに、幅方向に伸長可能となっている。より具体的には、弾性フィルム３０を幅方向に伸長した状態で、幅方向及びこれと直交する前後方向（伸縮方向と直交する方向）にそれぞれ間隔を空けて、弾性フィルム３０の貫通孔３１を介して第１シート層２０Ａ及び第２シート層２０Ｂを接合し、多数のシート接合部４０を形成することにより、伸縮領域８０及び非伸縮領域７０の両者を含む弾性フィルム伸縮構造２０Ｘ全体を形成するとともに、伸縮領域８０では弾性フィルム３０が幅方向に沿って直線的に連続する部分を有するように貫通孔３１を配置することによって、このような伸縮性を付与することができる。 (Elastic area)
In the stretchable region 80, the elastic film 30 has a portion 32 linearly continuous along the width direction, and is contracted in the width direction by the contraction force of the elastic film 30, and can be expanded in the width direction. It has become. More specifically, in a state where the elastic film 30 is extended in the width direction, the through-holes 31 of the elastic film 30 are formed at intervals in the width direction and in the front-rear direction (direction orthogonal to the expansion / contraction direction) orthogonal thereto. The first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B are joined together to form a large number of sheet joining portions 40, thereby forming the entire elastic film stretchable structure 20 </ b> X including both the stretchable region 80 and the non-stretchable region 70. At the same time, in the stretchable region 80, such a stretchability can be imparted by arranging the through holes 31 so that the elastic film 30 has a linearly continuous portion along the width direction.
　伸縮領域８０では、自然長状態では、図７（ｄ）及び図９（ｄ）に示すように、シート接合部４０間の第１シート層２０Ａ及び第２シート層２０Ｂが互いに離間する方向に膨らんで、前後方向に延びる収縮皺２５が形成され、図７（ｃ）及び図９（ｃ）に示すように、幅方向にある程度伸長した装着状態でも、収縮皺２５は伸ばされるものの、残るようになっている。また、図示形態のように、第１シート層２０Ａ及び第２シート層２０Ｂは、少なくともシート接合部４０における第１シート層２０Ａ及び第２シート層２０Ｂ間以外では弾性フィルム３０と接合されていないと、装着状態を想定した図７（ｃ）及び図９（ｄ）及び第１シート層２０Ａ及び第２シート層２０Ｂの展開状態を想定した図７（ａ）（ｂ）及び図９（ａ）（ｂ）からも分かるように、これらの状態では、弾性フィルム３０における貫通孔３１と、シート接合部４０との間に隙間が形成され、弾性フィルム３０の素材が無孔のフィルムやシートであっても、この隙間により通気性が付加される。また、図７（ｄ）及び図９（ｄ）に示す自然長状態では、弾性フィルム３０の収縮により貫通孔３１がすぼまり、貫通孔３１とシート接合部４０との間に隙間がほとんど形成されない。なお、装着状態及び自然長状態の収縮皺２５の状態は、図８及び図１０のサンプル写真にも現れている。 In the stretchable region 80, in the natural length state, as shown in FIGS. 7D and 9D, the first sheet layer 20A and the second sheet layer 20B between the sheet joining portions 40 swell in a direction away from each other. Thus, as shown in FIGS. 7 (c) and 9 (c), a shrinking fold 25 extending in the width direction is formed, but the shrinking fold 25 is stretched but remains, as shown in FIGS. 7 (c) and 9 (c). It has become. Further, as illustrated, the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic film 30 except at least between the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40. FIGS. 7 (c) and 9 (d) assuming the mounted state, and FIGS. 7 (a) (b) and 9 (a) (9) assuming the expanded state of the first sheet layer 20A and the second sheet layer 20B. As can be seen from b), in these states, a gap is formed between the through hole 31 in the elastic film 30 and the sheet joint portion 40, and the material of the elastic film 30 is a non-porous film or sheet. However, air permeability is added by this gap. Further, in the natural length state shown in FIG. 7D and FIG. 9D, the through hole 31 is squeezed due to the contraction of the elastic film 30, and almost no gap is formed between the through hole 31 and the sheet joining portion 40. Not. In addition, the state of the shrinkage wrinkle 25 in the mounted state and the natural length state also appears in the sample photographs of FIGS.
　伸縮領域８０の幅方向の弾性限界伸びは２００％以上（好ましくは２６５～２９５％）とすることが望ましい。伸縮領域８０の弾性限界伸びは、製造時の弾性フィルム３０の伸長率によってほぼ決まるがこれを基本として、幅方向の収縮を阻害する要因により低下する。このような阻害要因の主なものは、幅方向において単位長さ当たりに占めるシート接合部４０の長さ４０ｘの割合であり、この割合が大きくなるほど弾性限界伸びが低下する。通常の場合、シート接合部４０の長さ４０ｘはシート接合部４０の面積率と相関があるため、伸縮領域８０の弾性限界伸びはシート接合部４０の面積率により調整できる。 The elastic limit elongation in the width direction of the stretchable region 80 is desirably 200% or more (preferably 265 to 295%). The elastic limit elongation of the stretchable region 80 is substantially determined by the stretch rate of the elastic film 30 at the time of manufacture, but based on this, it is lowered by a factor that inhibits shrinkage in the width direction. The main factor of such inhibition is the ratio of the length 40x of the sheet joint portion 40 per unit length in the width direction, and the elastic limit elongation decreases as the ratio increases. In a normal case, the length 40x of the sheet bonding portion 40 has a correlation with the area ratio of the sheet bonding portion 40, so that the elastic limit elongation of the stretchable region 80 can be adjusted by the area ratio of the sheet bonding portion 40.
　伸縮領域８０の伸長応力は、主に弾性フィルム３０が幅方向に沿って直線的に連続する部分３２の幅３２ｗの総和により調整することができる。弾性フィルム３０が幅方向に沿って直線的に連続する部分３２の幅３２ｗは、当該連続する部分３２の両側縁に接する貫通孔３１の、前後方向の間隔３１ｄに等しく、当該貫通孔３１の間隔３１ｄは、前後方向における貫通孔３１の長さ３１ｙと、前後方向におけるシート接合部４０の長さ４０ｙとが等しいとき（前述の貫通孔３１及びシート接合部４０の同時形成手法を採用する場合等）には、当該連続する部分の両側縁に接するシート接合部４０の、前後方向の間隔４０ｄに等しい。よって、この場合には、前後方向において単位長さ当たりに占めるシート接合部４０の長さ４０ｙの割合により、伸縮領域８０の伸長応力を調整することができ、通常の場合、シート接合部４０の長さ４０ｙはシート接合部４０の面積率と相関があるため、伸縮領域８０の伸長応力はシート接合部４０の長さはシート接合部４０の面積率により調整できる。伸縮領域８０の伸長応力は、弾性限界の５０％まで伸長したときの伸長応力を目安とすることができる。 The elongation stress of the stretchable region 80 can be adjusted mainly by the sum of the widths 32w of the portions 32 where the elastic film 30 continues linearly along the width direction. The width 32w of the portion 32 in which the elastic film 30 is linearly continuous along the width direction is equal to the interval 31d in the front-rear direction of the through-holes 31 in contact with both side edges of the continuous portion 32. 31d is when the length 31y of the through-hole 31 in the front-rear direction is equal to the length 40y of the sheet-joint portion 40 in the front-rear direction (when the above-described simultaneous formation method of the through-hole 31 and the sheet joint 40 is employed, etc.) ) Is equal to the interval 40d in the front-rear direction of the sheet joining portion 40 in contact with both side edges of the continuous portion. Therefore, in this case, the extension stress of the stretchable region 80 can be adjusted by the ratio of the length 40y of the sheet joint portion 40 per unit length in the front-rear direction. Since the length 40y has a correlation with the area ratio of the sheet bonding portion 40, the elongation stress of the stretchable region 80 can be adjusted by adjusting the length of the sheet bonding portion 40 by the area ratio of the sheet bonding portion 40. The elongation stress of the expansion / contraction region 80 can be determined based on the elongation stress when it is expanded to 50% of the elastic limit.
　伸縮領域８０におけるシート接合部４０の面積率及び個々のシート接合部４０の面積は適宜定めることができるが、通常の場合、次の範囲内とするのが好ましい。
　シート接合部４０の面積：０．１４～３．５ｍｍ2（特に０．１４～１．０ｍｍ2）
　シート接合部４０の面積率：１．８～１９．１％（特に１．８～１０．６％） The area ratio of the sheet bonding portion 40 and the area of each sheet bonding portion 40 in the stretchable region 80 can be determined as appropriate, but in the normal case, it is preferably within the following range.
Area of sheet joint 40: 0.14 to 3.5 mm 2 (particularly 0.14 to 1.0 mm 2 )
Area ratio of sheet joint 40: 1.8 to 19.1% (especially 1.8 to 10.6%)
　このように、伸縮領域８０の弾性限界伸び及び伸長応力はシート接合部４０の面積により調整できるため、図１５に示すように、伸縮領域８０内にシート接合部４０の面積率が異なる複数の領域を設け、部位に応じてフィット性を変化させることができる。図１５に示す形態では、前身頃Ｆにおける脚の付け根に沿って斜め方向に延びる領域８１、及び脚開口の縁部領域８２は、それ以外の領域と比べてシート接合部４０の面積率が高く、従って伸長応力が弱く、柔軟に伸縮する領域となっている。また、後身頃Ｂにおける腸骨対向領域８３、及び脚開口の縁部領域８２も、それ以外の領域と比べてシート接合部４０の面積率が高く、したがって伸長応力が弱く、柔軟に伸縮する領域となっている。 As described above, since the elastic limit elongation and the extension stress of the stretchable region 80 can be adjusted by the area of the sheet joint portion 40, a plurality of regions having different area ratios of the sheet joint portion 40 in the stretchable region 80 as shown in FIG. The fitting property can be changed according to the part. In the form shown in FIG. 15, the area 81 extending in the oblique direction along the base of the leg in the front body F and the edge area 82 of the leg opening have a higher area ratio of the sheet joint portion 40 than the other areas. Therefore, the extensional stress is weak and the region expands and contracts flexibly. In addition, the iliac facing region 83 and the edge region 82 of the leg opening in the back body B also have a higher area ratio of the sheet joint portion 40 than the other regions, and therefore the extension stress is weak and the region expands and contracts flexibly. It has become.
　（非伸縮領域）
　一方、非伸縮領域７０は、弾性フィルム３０は幅方向に連続するものの、貫通孔３１の存在により幅方向に沿って直線的に連続する部分を有しない領域とされている。したがって、弾性フィルム３０を幅方向に伸長した状態で、幅方向及びこれと直交する前後方向にそれぞれ間隔を空けて、弾性フィルム３０の貫通孔３１を介して第１シート層２０Ａ及び第２シート層２０Ｂを接合し、多数のシート接合部４０を形成することにより、伸縮領域８０及び非伸縮領域７０の両者を含む弾性フィルム伸縮構造２０Ｘ全体を形成するとしても、図１１に示すように、非伸縮領域７０では、弾性フィルム３０が幅方向に沿って直線的に連続しないため、弾性フィルム３０の収縮力が第１シート層２０Ａ及び第２シート層２０Ｂにほとんど作用せず、伸縮性がほぼ消失し、弾性限界伸びは１００％に近くなるのである。そしてこのような非伸縮領域７０では、第１シート層２０Ａ及び第２シート層２０Ｂが間隔を空けて配列された多数のシート接合部４０で接合されており、シート接合部４０が連続的とならないため、柔軟性の低下は防止される。換言すれば、弾性フィルム３０が幅方向に沿って直線的に連続しない部分の有無により伸縮領域８０及び非伸縮領域７０を形成することができる。また、非伸縮領域７０でも弾性フィルム３０の連続性が残っており、図１２に示されるサンプル写真からも分かるように、弾性フィルム３０の独立切断片が残ることもなく、また皺も形成されないため、極めて見栄えが良く、かつ貫通孔３１による厚み方向の通気性が確保される。非伸縮領域７０は、幅方向の弾性限界伸びが１２０％以下（好ましくは１１０％以下、より好ましくは１００％）であると好ましい。 (Non-stretchable area)
On the other hand, the non-stretchable region 70 is a region that does not have a linearly continuous portion along the width direction due to the presence of the through hole 31, although the elastic film 30 is continuous in the width direction. Therefore, in a state where the elastic film 30 is extended in the width direction, the first sheet layer 20 </ b> A and the second sheet layer are spaced via the through-holes 31 of the elastic film 30 with an interval in the width direction and the front-rear direction orthogonal thereto. Even if the elastic film stretchable structure 20X including both the stretchable region 80 and the non-stretchable region 70 is formed by joining 20B and forming a large number of sheet joint portions 40, as shown in FIG. In the region 70, since the elastic film 30 does not continue linearly along the width direction, the contraction force of the elastic film 30 hardly acts on the first sheet layer 20A and the second sheet layer 20B, and the stretchability is almost lost. The elastic limit elongation is close to 100%. In such a non-stretchable region 70, the first sheet layer 20 </ b> A and the second sheet layer 20 </ b> B are joined by a large number of sheet joining portions 40 arranged at intervals, and the sheet joining portion 40 is not continuous. Therefore, a decrease in flexibility is prevented. In other words, the stretchable region 80 and the non-stretchable region 70 can be formed by the presence or absence of a portion where the elastic film 30 does not continue linearly along the width direction. Further, the continuity of the elastic film 30 remains even in the non-stretchable region 70, and as can be seen from the sample photograph shown in FIG. 12, the independent cut piece of the elastic film 30 does not remain and no wrinkles are formed. The appearance is very good and the air permeability in the thickness direction by the through hole 31 is ensured. The non-stretchable region 70 preferably has an elastic limit elongation in the width direction of 120% or less (preferably 110% or less, more preferably 100%).
　非伸縮領域７０における弾性フィルム３０における貫通孔３１の配列パターンは適宜定めることができるが、図１１に示すように千鳥状配置とし、貫通孔３１の前後方向の中心間隔３１ｅが貫通孔３１の前後方向の長さ３１ｙより短いパターンとすると、弾性フィルム３０の連続性を維持しつつ幅方向の直線連続性をほぼ完全に無くすことができ、見栄えも図１５に示すように好ましいものとなる。この場合、貫通孔３１の幅方向の中心間隔３１ｆが貫通孔３１の幅方向の長さ３１ｘより短いとがより好ましい。 Although the arrangement pattern of the through holes 31 in the elastic film 30 in the non-stretchable region 70 can be determined as appropriate, it is arranged in a staggered manner as shown in FIG. When the pattern is shorter than the length 31y in the direction, the linear continuity in the width direction can be almost completely eliminated while maintaining the continuity of the elastic film 30, and the appearance is also preferable as shown in FIG. In this case, it is more preferable that the center interval 31f in the width direction of the through hole 31 is shorter than the length 31x of the through hole 31 in the width direction.
　通常の場合、中でも弾性フィルム３０を幅方向に４倍に伸長したときの伸長応力が４．０～１２Ｎ／３５ｍｍのものである場合、非伸縮領域７０を幅方向に弾性限界まで伸ばした状態で、貫通孔３１の前後方向の中心間隔３１ｅが０．４～２．７ｍｍ、かつ貫通孔３１の前後方向の長さ３１ｙが０．５～３．０ｍｍ、特に０．７～１．１ｍｍであると好ましい。また、貫通孔３１の幅方向の中心間隔３１ｆが、貫通孔３１の前後方向の長さ３１ｙの０．５～２．０倍、特に１．０～１．２倍であると好ましく、貫通孔３１の幅方向の長さ３１ｘが、貫通孔３１の幅方向の中心間隔３１ｆの１．１～１．８倍、特に１．１～１．４倍であると好ましい。なお、非伸縮領域７０を幅方向に弾性限界まで伸ばした状態（換言すれば第１シート層２０Ａ及び第２シート層２０Ｂが完全に展開した状態）では、貫通孔３１の幅方向の中心間隔３１ｆはシート接合部４０の幅方向の中心間隔４０ｆに等しく、貫通孔３１の前後方向の中心間隔３１ｅはシート接合部４０の前後方向の中心間隔４０ｅに等しく、貫通孔３１の前後方向の長さ３１ｙはシート接合部４０の前後方向の長さ４０ｙに等しい。 In a normal case, in particular, when the elastic film 30 has a stretching stress of 4.0 to 12 N / 35 mm when stretched four times in the width direction, the non-stretchable region 70 is stretched to the elastic limit in the width direction. The center distance 31e in the front-rear direction of the through-hole 31 is 0.4 to 2.7 mm, and the length 31y in the front-rear direction of the through-hole 31 is 0.5 to 3.0 mm, particularly 0.7 to 1.1 mm. And preferred. The center interval 31f in the width direction of the through holes 31 is preferably 0.5 to 2.0 times, particularly 1.0 to 1.2 times the length 31y of the through holes 31 in the front-rear direction. The length 31x in the width direction of 31 is preferably 1.1 to 1.8 times, particularly 1.1 to 1.4 times the center interval 31f in the width direction of the through hole 31. In the state in which the non-stretchable region 70 is extended to the elastic limit in the width direction (in other words, the first sheet layer 20A and the second sheet layer 20B are completely expanded), the center interval 31f in the width direction of the through hole 31 Is equal to the center interval 40f in the width direction of the sheet bonding portion 40, the center interval 31e in the front-rear direction of the through-hole 31 is equal to the center interval 40e in the front-rear direction of the sheet bonding portion 40, and the length 31y in the front-rear direction of the through-hole 31 Is equal to the length 40y in the front-rear direction of the sheet joint 40.
　非伸縮領域７０では、シート接合部４０における第１シート層２０Ａ及び第２シート層２０Ｂの間以外では、第１シート層２０Ａ及び第２シート層２０Ｂと弾性フィルム３０とが接合されておらず、かつ自然長の状態でシート接合部４０の幅方向両側に弾性フィルム３０の貫通孔３１の周縁及びシート接合部４０が離間されて形成された隙間を有していると、弾性フィルム３０の素材が無孔のフィルムやシートであっても、この隙間により常に通気性が付加されるため好ましい。前述の貫通孔３１及びシート接合部４０の同時形成手法を採用する場合には、シート接合部４０の形状等に関係なく、自然にこの状態になる。 In the non-stretchable region 70, the first sheet layer 20A and the second sheet layer 20B and the elastic film 30 are not joined except for the portion between the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40, And when it has a gap formed by separating the peripheral edge of the through hole 31 of the elastic film 30 and the sheet bonding portion 40 on both sides in the width direction of the sheet bonding portion 40 in a natural length state, the material of the elastic film 30 is Even a non-porous film or sheet is preferable because air permeability is always added by this gap. In the case where the above-described simultaneous formation method of the through hole 31 and the sheet joint portion 40 is adopted, this state naturally occurs regardless of the shape or the like of the sheet joint portion 40.
　個々のシート接合部４０及び貫通孔３１の自然長状態での形状は、特に限定されないが、柔軟性の観点からは面積が小さいことが望ましく、弾性フィルム３０の幅方向の直線連続性をなくすためには、前後方向に長い形状であることが望ましいため、前後方向に長い楕円形、長方形（図１１、図１３（ｄ）参照）、ひし形（図１３（ｂ）参照）、凸レンズ形（図１３（ａ）参照）、凹レンズ形（図１３（ｃ）参照）とすることが好ましい。ただし、ひし形のように角が鋭角であると、弾性フィルム３０が破断しやすい。これに対して、凸レンズ形はシート接合部４０の溶着が安定するため好ましく、凹レンズ形は面積をより小さくできる点で好ましい。 Although the shape in the natural length state of each sheet | seat junction part 40 and the through-hole 31 is not specifically limited, In order to eliminate the linear continuity of the width direction of the elastic film 30, it is desirable that an area is small from a softness | flexibility viewpoint. Since it is desirable to have a shape that is long in the front-rear direction, an ellipse that is long in the front-rear direction, a rectangle (see FIGS. 11 and 13D), a rhombus (see FIG. 13B), and a convex lens shape (see FIG. 13). (See (a)), and preferably a concave lens shape (see FIG. 13C). However, if the corner is an acute angle like a diamond, the elastic film 30 is easily broken. On the other hand, the convex lens shape is preferable because the welding of the sheet joining portion 40 is stable, and the concave lens shape is preferable in that the area can be further reduced.
　非伸縮領域におけるシート接合部４０の面積率及び個々のシート接合部４０の面積は適宜定めることができるが、通常の場合、次の範囲内とすると、各シート接合部４０の面積が小さくかつシート接合部４０の面積率が低いことにより非伸縮領域７０が硬くならいためが好ましい。
　シート接合部４０の面積：０．１０～０．７５ｍｍ2（特に０．１０～０．３５ｍｍ2）
　シート接合部４０の面積率：４～１３％（特に５～１０％） Although the area ratio of the sheet joint portion 40 and the area of each sheet joint portion 40 in the non-stretchable region can be determined as appropriate, in the normal case, if within the following range, the area of each sheet joint portion 40 is small and the sheet It is preferable that the non-stretchable region 70 does not become hard because the area ratio of the joint portion 40 is low.
Area of sheet joint 40: 0.10 to 0.75 mm 2 (particularly 0.10 to 0.35 mm 2 )
Sheet area 40: 4 to 13% (especially 5 to 10%)
　このように、非伸縮領域７０の弾性限界伸びは、貫通孔３１の配列パターンや、個々の貫通孔３１の寸法及び中心間隔により変化させることができる。よって、図示しないが、これらを伸縮領域８０内の複数個所、又は複数の非伸縮領域７０間で異ならしめることもできる。例えば、前身頃Ｆの非伸縮領域７０における弾性限界伸びを後身頃Ｂの非伸縮領域７０における弾性限界伸びよりも大きくするのは一つの好ましい形態である。 Thus, the elastic limit elongation of the non-stretchable region 70 can be changed according to the arrangement pattern of the through holes 31, the dimensions of the individual through holes 31, and the center interval. Therefore, although not shown, these can be made different at a plurality of locations in the stretchable region 80 or between the plurality of non-stretchable regions 70. For example, it is one preferable mode to make the elastic limit elongation in the non-stretchable region 70 of the front body F larger than the elastic limit elongation in the non-stretchable region 70 of the rear body B.
　非伸縮領域７０は、伸縮領域と同様に幅方向に沿って直線的に連続する部分を有するものの、シート接合部の面積率が伸縮領域よりも高いことにより弾性限界伸びが著しく、具体的には１３０％以下とされている形態、従来の糸ゴムを用いる伸縮構造のように幅方向に一か所又は複数個所で切断する形態等、他の伸縮性を殺す形態を採用することもできる。 Although the non-stretchable region 70 has a portion that is linearly continuous along the width direction like the stretchable region, the elastic limit elongation is remarkable because the area ratio of the sheet joint portion is higher than the stretchable region. It is also possible to adopt a form that kills other stretchability, such as a form that is 130% or less, a form that is cut at one place or a plurality of places in the width direction, such as a stretchable structure using a conventional rubber thread.
　（伸縮ホットメルト接着剤）
　特徴的には、図２、図４、及び図１４（ａ）に示すように、伸縮領域８０におけるウエスト開口の縁部分（ウエスト端部領域２３）及び脚周りライン２９に沿う脚開口の縁部分では、第２シート層２０Ｂ及び弾性フィルム３０の間が伸縮ホットメルト接着剤９０により接着されており、伸縮領域８０における伸縮ホットメルト接着剤９０を有しない領域では、弾性フィルム３０の収縮により幅方向に収縮しているとともに、幅方向に伸長可能とされる一方、伸縮ホットメルト接着剤９０を有する領域では、弾性フィルム３０及び伸縮ホットメルト接着剤９０の収縮により幅方向に収縮しているとともに、幅方向に伸長可能とされている。 (Elastic hot melt adhesive)
Characteristically, as shown in FIGS. 2, 4, and 14 (a), the edge portion of the waist opening (waist end region 23) in the stretchable region 80 and the edge portion of the leg opening along the leg circumference line 29. Then, between the second sheet layer 20B and the elastic film 30 is adhered by the stretchable hot melt adhesive 90, and in the stretch region 80 where the stretchable hot melt adhesive 90 is not provided, the elastic film 30 contracts in the width direction. In the region having the stretchable hot melt adhesive 90, the elastic film 30 and the stretchable hot melt adhesive 90 are shrunk in the width direction while being contracted in the width direction. It can be extended in the width direction.
　したがって、ウエスト開口の縁部分及び脚開口の縁部分では、弾性フィルム３０及び伸縮ホットメルト接着剤９０の二つにより、それに続く部分では弾性フィルム３０のみにより弾性伸縮するため、ウエスト開口の縁部分及び脚開口の縁部分並びにそれに続く部分が同一の弾性フィルム３０による伸縮構造でありながら、ウエスト開口の縁部分及び脚開口の縁部分をより強く締め付けることができるようになる。よって、弾性フィルム３０のみでパンツタイプ使い捨ておむつに好ましいフィット性を作り出すことができる。また、脚開口の縁部分において伸縮ホットメルト接着剤９０により、第２シート層２０Ｂと弾性フィルム３０とが接着されているため、脚周りライン２９で弾性フィルム３０及び第２シート層２０Ｂが自由に離間し、見栄えが悪化したり、シート接合部４０が剥がれたりするおそれが少ないものとなる。 Accordingly, since the elastic film 30 and the stretchable hot melt adhesive 90 are elastically stretched by the elastic film 30 and the stretchable hot melt adhesive 90 at the edge part of the waist opening and the leg opening, the elastic film 30 is elastically stretched only at the subsequent part. While the edge part of the leg opening and the subsequent part are stretchable structures by the same elastic film 30, the edge part of the waist opening and the edge part of the leg opening can be tightened more strongly. Therefore, it is possible to create a suitable fit for the pants-type disposable diaper with only the elastic film 30. In addition, since the second sheet layer 20B and the elastic film 30 are bonded to each other at the edge portion of the leg opening by the stretchable hot-melt adhesive 90, the elastic film 30 and the second sheet layer 20B can be freely attached at the leg circumference line 29. It will be separated, and there is little possibility that an appearance will deteriorate or the sheet | seat junction part 40 will peel off.
　伸縮ホットメルト接着剤９０は、弾性フィルム３０の伸長応力を補強しうる限り、特に限定されるものではないが、例えば特開平１０－８８０９７号公報に記載されたものを用いることができる。 The stretchable hot melt adhesive 90 is not particularly limited as long as it can reinforce the elongation stress of the elastic film 30. For example, the one described in JP-A-10-88097 can be used.
　製造に際しては、第１シート層２０Ａ及び第２シート層２０Ｂの接合前に、ホットメルト接着剤の塗布装置を用いて、伸縮ホットメルト接着剤９０を第１シート層２０Ａにおける弾性フィルム３０側の面、第２シート層２０Ｂにおける弾性フィルム３０側の面、あるいは弾性フィルム３０の表裏少なくとも一方の面に塗布すれば良い。弾性フィルム３０に伸縮ホットメルト接着剤９０を塗布する場合には、図２０に示すように、伸長前塗布装置６４により弾性フィルム３０の伸長前の位置で塗布したり、伸長後塗布装置６５により弾性フィルム３０を所定の伸長率まで伸長した状態で塗布したりすることができる。伸長前の弾性フィルム３０に伸縮ホットメルト接着剤９０を塗布する場合には、塗布後の伸縮ホットメルト接着剤９０も弾性フィルム３０とともに伸長されるため、弾性フィルム３０の送り速度に対して伸長前塗布装置６４による伸縮ホットメルト接着剤９０の吐出速度は高くても、同じでも、低くても良い。これに対して、伸長後の弾性フィルム３０に対して伸縮ホットメルト接着剤９０を塗布する場合には、弾性フィルム３０の送り速度を伸長後塗布装置６５による伸縮ホットメルト接着剤９０の吐出速度よりも速くし、吐出ノズルと弾性フィルム３０の接触位置との間で伸縮ホットメルト接着剤９０を弾性フィルム３０と同程度まで伸長する必要がある。この伸長の程度は、弾性フィルム３０の送り速度と伸縮ホットメルト接着剤９０の吐出速度との比、及び伸縮ホットメルト接着剤９０の粘性等の特性により変化させることができる。第１シート層２０Ａや第２シート層２０Ｂに伸縮ホットメルト接着剤９０を塗布する場合も、伸長後の弾性フィルム３０に塗布する場合と同様に行うことができる。伸縮ホットメルト接着剤９０の塗布方式（パターン）は、製品において伸縮ホットメルト接着剤９０の伸縮性が発揮される限り特に限定されず、ベタ、ビード、カーテン、サミット若しくはスパイラル塗布など適宜採用することができる。 At the time of manufacture, before joining the first sheet layer 20A and the second sheet layer 20B, a stretchable hot melt adhesive 90 is applied to the elastic film 30 side surface of the first sheet layer 20A using a hot melt adhesive application device. What is necessary is just to apply | coat to the surface by the side of the elastic film 30 in the 2nd sheet layer 20B, or at least one surface of the elastic film 30. When the stretchable hot melt adhesive 90 is applied to the elastic film 30, as shown in FIG. 20, the elastic film 30 is applied at a position before the elastic film 30 is stretched by the pre-extension application device 64, or is elastic by the post-extension coating device 65. The film 30 can be applied in a state of being stretched to a predetermined stretch rate. When the stretchable hot melt adhesive 90 is applied to the elastic film 30 before being stretched, the stretchable hot melt adhesive 90 after being stretched is also stretched together with the elastic film 30. The discharge speed of the stretchable hot melt adhesive 90 by the coating device 64 may be high, the same, or low. On the other hand, when the stretchable hot melt adhesive 90 is applied to the stretched elastic film 30, the feeding speed of the elastic film 30 is set higher than the discharge speed of the stretchable hot melt adhesive 90 by the coating device 65 after stretching. It is necessary to extend the stretchable hot melt adhesive 90 to the same extent as the elastic film 30 between the discharge nozzle and the contact position of the elastic film 30. The degree of extension can be changed by the ratio of the feeding speed of the elastic film 30 and the discharge speed of the stretchable hot melt adhesive 90 and the characteristics such as the viscosity of the stretchable hot melt adhesive 90. Even when the stretchable hot-melt adhesive 90 is applied to the first sheet layer 20A and the second sheet layer 20B, it can be performed in the same manner as when applied to the stretched elastic film 30. The application method (pattern) of the stretchable hot-melt adhesive 90 is not particularly limited as long as the stretchability of the stretchable hot-melt adhesive 90 is exhibited in the product, and a solid, bead, curtain, summit, spiral coating, or the like is appropriately employed. Can do.
　伸縮ホットメルト接着剤９０を用いると、その接着部分の硬質化は避けることができない。よって、図４に示すように伸縮ホットメルト接着剤９０を、弾性フィルム３０の外側に位置する第２シート層２０Ｂと弾性フィルム３０との間にのみ設けるのは一つの好ましい形態である。これにより、伸縮ホットメルト接着剤９０が、弾性フィルム３０の内側に位置する第１シート層２０Ａと弾性フィルム３０とを介して肌に接することとなるため、伸縮ホットメルト接着剤９０による硬質化が肌触りに影響しにくくなる。もちろん、伸縮ホットメルト接着剤９０を、弾性フィルム３０の外側に位置する第２シート層２０Ｂと弾性フィルム３０との間にのみ用いたり、第１シート層２０Ａと弾性フィルム３０との間、及び第１シート層２０Ａと弾性フィルム３０との間の両方に用いたりすることもできる。 When the stretchable hot melt adhesive 90 is used, it is inevitable that the bonded portion is hardened. Therefore, as shown in FIG. 4, it is one preferable embodiment that the stretchable hot melt adhesive 90 is provided only between the second sheet layer 20 </ b> B located outside the elastic film 30 and the elastic film 30. As a result, the stretchable hot melt adhesive 90 comes into contact with the skin via the first sheet layer 20 </ b> A located inside the elastic film 30 and the elastic film 30. It becomes difficult to affect the touch. Of course, the stretchable hot melt adhesive 90 is used only between the second sheet layer 20B and the elastic film 30 located outside the elastic film 30, or between the first sheet layer 20A and the elastic film 30, and It can also be used between the one sheet layer 20A and the elastic film 30.
　図示形態のように、脚開口の縁が、脚周りに沿う曲線状の脚周りライン２９として形成されている形態の場合には、脚開口の縁部分に、矩形状の伸縮ホットメルト接着剤９０による接着部分を多数前後方向に並べ、かつその幅方向中央側の端部が脚周りに沿って階段状をなすようにすると、外装体２０の幅方向がＭＤ方向となる製造形態において、脚開口の縁に沿って伸縮ホットメルト接着剤９０を有する領域を形成できる。この形態における伸縮ホットメルト接着剤９０の塗布パターンが図２２に示されている。図２２に示されるように、ウエスト開口の縁部分に伸縮ホットメルト接着剤９０を設ける場合には、階段状にせずに、矩形状の伸縮ホットメルト接着剤９０による接着部分を複数前後方向に並べればよい。図示しないが、脚開口の縁が幅方向に沿う場合に脚開口の縁部分に伸縮ホットメルト接着剤９０を設ける場合もこれと同様である。なお、このように、伸縮ホットメルト接着剤９０による接着部分を前後方向に並べる場合、伸縮ホットメルト接着剤９０による接着部分を幅方向に細長く延びる形状とし、前後方向に間隔を空けて複数設けることにより、伸縮ホットメルト接着剤９０による硬質化を抑制することができる。 In the case where the edge of the leg opening is formed as a curved leg circumference line 29 along the circumference of the leg as shown in the figure, a rectangular stretchable hot melt adhesive 90 is formed on the edge of the leg opening. In the manufacturing form in which the width direction of the exterior body 20 is in the MD direction, a large number of bonding portions are arranged in the front-rear direction and the end portion on the center side in the width direction forms a step shape along the periphery of the leg. A region having the stretchable hot melt adhesive 90 can be formed along the edges of the film. An application pattern of the stretchable hot melt adhesive 90 in this form is shown in FIG. As shown in FIG. 22, when the stretchable hot melt adhesive 90 is provided at the edge of the waist opening, a plurality of adhesive portions by the rectangular stretchable hot melt adhesive 90 can be arranged in the front-rear direction without being stepped. That's fine. Although not shown, the same applies to the case where the stretchable hot melt adhesive 90 is provided on the edge portion of the leg opening when the edge of the leg opening is along the width direction. As described above, when the adhesive portions by the stretchable hot melt adhesive 90 are arranged in the front-rear direction, the adhesive portions by the stretchable hot melt adhesive 90 are elongated in the width direction, and a plurality are provided at intervals in the front-rear direction. Thereby, the hardening by the expansion / contraction hot melt adhesive 90 can be suppressed.
　伸縮ホットメルト接着剤９０の接着部分を前後方向に並べる場合、接着部分の前後方向寸法９０ｗは１．０～５．０ｍｍ程度、特に１．５～３．０ｍｍ程度とするのが好ましい。また、伸縮ホットメルト接着剤９０の接着部分を前後方向に間隔を空けて並べる場合には、接着部分の前後方向寸法９０ｗは１．０～５．０ｍｍ程度、特に１．５～３．０ｍｍ程度とし、前後方向間隔９０ｄは１．０～５．０ｍｍ程度、特に１．０～２．５ｍｍ程度とすることが好ましい。もちろん、この範囲外とすることも可能である。 When the bonded portions of the stretchable hot melt adhesive 90 are arranged in the front-rear direction, the front-rear dimension 90w of the bonded portion is preferably about 1.0 to 5.0 mm, particularly about 1.5 to 3.0 mm. In addition, when the adhesive portions of the stretchable hot melt adhesive 90 are arranged at intervals in the front-rear direction, the front-rear dimension 90w of the adhesive portions is about 1.0 to 5.0 mm, particularly about 1.5 to 3.0 mm. The distance in the front-rear direction 90d is preferably about 1.0 to 5.0 mm, particularly about 1.0 to 2.5 mm. Of course, it is possible to be outside this range.
　図２に示す形態では、伸縮領域８０におけるウエスト開口の縁部分の幅方向全体、伸縮領域８０における脚開口の縁部分の幅方向全体にわたり伸縮ホットメルト接着剤９０を設けたが、幅方向の一部だけ、例えば幅方向の中間部だけに設け、部分的に伸長応力を補強することもできる。 In the embodiment shown in FIG. 2, the stretchable hot melt adhesive 90 is provided over the entire width direction of the edge portion of the waist opening in the stretchable region 80 and over the entire width direction of the edge portion of the leg opening in the stretchable region 80. It is also possible to reinforce the elongation stress partially by providing only at the portion, for example, only at the intermediate portion in the width direction.
　図２に示す形態では、ウエスト開口の縁部分及び脚開口の縁部分の両方に伸縮ホットメルト接着剤９０を設けたが、図１５及び図１６に示すように脚開口の縁部分にのみ伸縮ホットメルト接着剤９０を設けたり、図示しないがウエスト開口の縁部分にのみ伸縮ホットメルト接着剤９０を設けたりすることもできる。また、前身頃Ｆ及び後身頃Ｂのいずれか一方のみ伸縮ホットメルト接着剤９０を設けることもできる。 In the embodiment shown in FIG. 2, the stretchable hot melt adhesive 90 is provided on both the edge portion of the waist opening and the edge portion of the leg opening. However, as shown in FIGS. The melt adhesive 90 can be provided, or although not shown, the stretchable hot melt adhesive 90 can be provided only at the edge portion of the waist opening. In addition, the stretchable hot melt adhesive 90 can be provided for only one of the front body F and the back body B.
　（前後押さえシート）
　図１及び図４にも示されるように、外装体２０の内面上に取り付けられた内装体１０の前後端部をカバーし、且つ内装体１０の前後縁からの漏れを防ぐために、前後押さえシート５０，６０が設けられていても良い。図示形態について更に詳細に説明すると、前押さえシート５０は、前身頃Ｆの外装体２０の内面のうちウエスト端部領域２３の折り返し部分２０Ｃの内面から内装体１０の前端部と重なる位置まで幅方向全体にわたり延在しており、後押さえシート６０は、後身頃Ｂの外装体２０の内面のうちウエスト端部領域２３の折り返し部分２０Ｃの内面から内装体１０の後端部と重なる位置まで幅方向全体にわたり延在している。前後押さえシート５０，６０の股間側の縁部に幅方向の全体にわたり（中央部のみでも良い）若干の非接着部分を設けると、接着剤がはみ出ないだけでなく、この部分をトップシートから若干浮かせて防漏壁として機能させることができる。 (Front / rear holding sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 attached on the inner surface of the exterior body 20 and to prevent leakage from the front and rear edges of the interior body 10, 50 and 60 may be provided. Explaining in more detail about the illustrated form, the front presser sheet 50 extends in the width direction from the inner surface of the folded portion 20C of the waist end region 23 of the inner surface of the outer body 20 of the front body F to a position overlapping the front end portion of the inner body 10. The rear presser sheet 60 extends in the width direction from the inner surface of the folded portion 20C of the waist end region 23 to the position overlapping the rear end portion of the inner body 10 in the inner surface of the outer body 20 of the back body B. It extends throughout. If a slight non-adhesive portion is provided over the entire width direction (or only the central portion) at the crotch side edges of the front and rear pressing sheets 50, 60, not only does the adhesive not protrude, but this portion is slightly removed from the top sheet. Can float and function as a leak-proof wall.
　図示形態のように、前後押さえシート５０，６０を別体として取り付けると、素材選択の自由度が高くなる利点があるものの、資材や製造工程が増加する等のデメリットもある。そのため、外装体２０をおむつ内面に折り返してなる折り返し部分２０Ｃを、内装体１０と重なる部分まで延在させて、前述の押さえシート５０，６０と同等の部分を形成することもできる。 As shown in the figure, when the front and rear press sheets 50 and 60 are attached as separate bodies, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior body 20 on the inner surface of the diaper can be extended to a portion overlapping the interior body 10 to form a portion equivalent to the above-described pressing sheets 50 and 60.
　＜明細書中の用語の説明＞
　明細書中の以下の用語は、明細書中に特に記載が無い限り、以下の意味を有するものである。
　・「前身頃」「後身頃」は、パンツタイプ使い捨ておむつの前後方向中央を境としてそれぞれ前側及び後側の部分を意味する。また、股間部は、パンツタイプ使い捨ておむつの前後方向中央を含む前後方向範囲を意味し、吸収体が括れ部を有する場合には当該括れ部を有する部分の前後方向範囲を意味する。
　・「弾性限界伸び」とは、伸縮方向における弾性限界（換言すれば第１シート層及び第２シート層が完全に展開した状態）の伸びを意味し、弾性限界時の長さを自然長を１００％としたときの百分率で表すものである。
　・「面積率」とは単位面積に占める対象部分の割合を意味し、対象領域（例えば伸縮領域８０、非伸縮領域７０、主伸縮部分、緩衝伸縮部分）における対象部分（例えばシート接合部４０、貫通孔３１の開口、通気孔）の総和面積を当該対象領域の面積で除して百分率で表すものであり、特に伸縮構造を有する領域における「面積率」とは、伸縮方向に弾性限界まで伸ばした状態の面積率を意味するものである。対象部分が間隔を空けて多数設けられる形態では、対象部分が１０個以上含まれるような大きさに対象領域を設定して、面積率を求めることが望ましい。
　・「伸長率」は、自然長を１００％としたときの値を意味する。
　・「目付け」は次のようにして測定されるものである。試料又は試験片を予備乾燥した後、標準状態（試験場所は、温度２０±５℃、相対湿度６５％以下）の試験室又は装置内に放置し、恒量になった状態にする。予備乾燥は、試料又は試験片を相対湿度１０～２５％、温度５０℃を超えない環境で恒量にすることをいう。なお、公定水分率が０．０％の繊維については、予備乾燥を行わなくてもよい。恒量になった状態の試験片から米坪板(２００ｍｍ×２５０ｍｍ、±２ｍｍ)を使用し、２００ｍｍ×２５０ｍｍ（±２ｍｍ）の寸法の試料を切り取る。試料の重量を測定し、２０倍して１平米あたりの重さを算出し、目付けとする。
　・吸収体の「厚み」は、株式会社尾崎製作所の厚み測定器（ピーコック、ダイヤルシックネスゲージ大型タイプ、型式Ｊ－Ｂ（測定範囲０～３５ｍｍ）又は型式Ｋ－４（測定範囲０～５０ｍｍ））を用い、試料と厚み測定器を水平にして、測定する。
　・上記以外の「厚み」は、自動厚み測定器（ＫＥＳ－Ｇ５　ハンディ圧縮計測プログラム）を用い、荷重：１０ｇｆ／ｃｍ2、及び加圧面積：２ｃｍ2の条件下で自動測定する。
　・「引張強度」及び「引張伸度（破断伸び）」は、試験片を幅３５ｍｍ×長さ８０ｍｍの長方形状とする以外は、ＪＩＳ　Ｋ７１２７：１９９９「プラスチック－引張特性の試験方法－」に準じて、初期チャック間隔（標線間距離）を５０ｍｍとし、引張速度を３００ｍｍ／ｍｉｎとして測定される値を意味する。引張試験機としては、例えばＳＨＩＭＡＤＺＵ社製のＡＯＵＴＧＲＡＰＨＡＧＳ－Ｇ１００Ｎを用いることができる。
　・「伸長応力」とは、ＪＩＳ　Ｋ７１２７：１９９９「プラスチック－引張特性の試験方法－」に準じて、初期チャック間隔（標線間距離）を５０ｍｍとし、引張速度を３００ｍｍ／ｍｉｎとする引張試験により、弾性領域内で伸長するときに測定される引張応力（Ｎ／３５ｍｍ）を意味し、伸長の程度は試験対象により適宜決定することができる。試験片は幅３５ｍｍ、長さ８０ｍｍ以上の長方形状とすることが好ましいが、幅３５ｍｍの試験片を切り出すことができない場合には、切り出し可能な幅で試験片を作成し、測定値を幅３５ｍｍに換算した値とする。また、対象領域が小さく、十分な試験片を採取できない場合であっても、伸長応力の大小を比較するのであれば、適宜小さい試験片でも同寸法の試験片を用いる限り少なくとも比較は可能である。引張試験機としては、例えばＳＨＩＭＡＤＺＵ社製のＡＯＵＴＧＲＡＰＨＡＧＳ－Ｇ１００Ｎを用いることができる。
　・「展開状態」とは、収縮や弛み無く平坦に展開した状態を意味する。
　・各部の寸法は、特に記載が無い限り、自然長状態ではなく展開状態における寸法を意味する。
　・試験や測定における環境条件についての記載が無い場合、その試験や測定は、標準状態（試験場所は、温度２０±５℃、相対湿度６５％以下）の試験室又は装置内で行うものとする。 <Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
-"Front body" and "rear body" mean the front and rear portions of the pants-type disposable diaper in the front-rear direction center, respectively. Moreover, a crotch part means the front-back direction range containing the center of the front-back direction of a pants type disposable diaper, and when an absorber has a constriction part, it means the front-back direction range of the part which has the said constriction part.
-“Elastic limit elongation” means the elongation of the elastic limit in the expansion / contraction direction (in other words, the state in which the first sheet layer and the second sheet layer are completely expanded), and the length at the elastic limit is the natural length. It is expressed as a percentage when 100% is assumed.
The “area ratio” means the ratio of the target portion to the unit area, and the target portion (for example, the sheet joint portion 40, the stretchable region 80, the non-stretchable region 70, the main stretchable portion, the buffer stretchable portion) in the target region. The total area of the through holes 31 and the vent holes) is divided by the area of the target region and expressed as a percentage. In particular, the “area ratio” in the region having the stretchable structure extends to the elastic limit in the stretchable direction. It means the area ratio of the state. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio.
“Elongation rate” means a value when the natural length is 100%.
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
・ "Thickness" of the absorber is a thickness measuring instrument from Ozaki Manufacturing Co., Ltd. (peacock, dial thickness gauge large type, model JB (measurement range 0 to 35 mm) or model K-4 (measurement range 0 to 50 mm)) Measure the sample and the thickness meter horizontally.
“Thickness” other than the above is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 10 gf / cm 2 and pressure area: 2 cm 2 .
・ "Tensile strength" and "Tensile elongation (breaking elongation)" conform to JIS K7127: 1999 "Plastics-Test method for tensile properties-" except that the test piece is rectangular with a width of 35 mm x length of 80 mm. The initial chuck interval (distance between marked lines) is 50 mm, and the tensile speed is 300 mm / min. As the tensile tester, for example, AOUTGRAPHAGS-G100N manufactured by SHIMADZU can be used.
・ "Elongation stress" refers to a tensile test according to JIS K7127: 1999 "Plastics-Test method for tensile properties-" with an initial chuck interval (distance between marked lines) of 50 mm and a tensile speed of 300 mm / min. This means the tensile stress (N / 35 mm) measured when stretching in the elastic region, and the degree of stretching can be appropriately determined depending on the test object. It is preferable that the test piece has a rectangular shape with a width of 35 mm and a length of 80 mm or more. However, when a test piece with a width of 35 mm cannot be cut out, the test piece is prepared with a width that can be cut out, and the measured value is 35 mm. The value converted to. Even if the target area is small and sufficient specimens cannot be collected, as long as the magnitude of the extension stress is compared, at least a comparison can be made even if the specimens of the same size are used even if they are appropriately small. . As the tensile tester, for example, AOUTGRAPHAGS-G100N manufactured by SHIMADZU can be used.
-"Developed state" means a state where the plate is flattened without contraction or slack.
-Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.
・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .
　本発明の弾性フィルム伸縮構造は、パンツタイプ使い捨ておむつの外装体に適用可能なものである。 The elastic film stretchable structure of the present invention can be applied to an exterior body of a pants-type disposable diaper.
　Ｂ…後身頃、Ｆ…前身頃、Ｔ…胴周り部、Ｌ…中間部、１０…内装体、１１…液透過性トップシート、１２…液不透過性シート、１３…吸収体、１３Ｎ…括れ部分、１４…包装シート、１５…ギャザー不織布、１６…ギャザー弾性部材、２０…外装体、２０Ａ…第１シート層、２０Ｂ…第２シート層、２０Ｃ…折り返し部分、２０Ｘ…弾性フィルム伸縮構造、２１…サイドシール部、２３…ウエスト端部領域、２４…ウエスト部弾性部材、２５…収縮皺、２９…脚周りライン、３０…弾性フィルム、３１…貫通孔、４０…シート接合部、７０…非伸縮領域、８０…伸縮領域、９０…伸縮ホットメルト接着剤。 B ... Rear body, F ... Front body, T ... Trunk circumference part, L ... Middle part, 10 ... Interior body, 11 ... Liquid-permeable top sheet, 12 ... Liquid-impermeable sheet, 13 ... Absorber, 13N ... Part: 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Gather elastic member, 20 ... Exterior body, 20A ... First sheet layer, 20B ... Second sheet layer, 20C ... Folded part, 20X ... Elastic film stretchable structure, 21 DESCRIPTION OF SYMBOLS ... Side seal part, 23 ... Waist edge part area | region, 24 ... Waist part elastic member, 25 ... Shrinkage collar, 29 ... Leg circumference line, 30 ... Elastic film, 31 ... Through-hole, 40 ... Sheet | seat junction part, 70 ... Non-stretching Region, 80 ... stretchable region, 90 ... stretchable hot melt adhesive.

Claims (5)

  1. 　前身頃の側縁部と後身頃の側縁部とが幅方向両側で接合されて、ウエスト開口及び脚開口が形成されてなる、パンツタイプ使い捨ておむつにおいて、
    　前記ウエスト開口及び脚開口の少なくとも一方の開口の縁部分からそれに続く部分にかけて、第１シート層及び第２シート層の間に弾性フィルムが積層されるとともに、前記第１シート層及び第２シート層が、間隔を空けて配列された多数のシート接合部で直接的又は間接的に接合された、幅方向に伸縮する伸縮領域を有しており、
    　前記伸縮領域における前記開口の縁部分では、前記第１シート層及び弾性フィルムの間、並びに前記第２シート層及び弾性フィルムの間の少なくとも一方が、伸縮ホットメルト接着剤により接着されており、
    　前記伸縮領域における伸縮ホットメルト接着剤を有しない領域では、前記弾性フィルムの収縮により幅方向に収縮しているとともに、幅方向に伸長可能であり、
    　前記伸縮ホットメルト接着剤を有する領域では、前記弾性フィルム及び前記伸縮ホットメルト接着剤の収縮により幅方向に収縮しているとともに、幅方向に伸長可能である、
    　ことを特徴とするパンツタイプ使い捨ておむつ。     In the pants-type disposable diaper in which the side edge of the front body and the side edge of the back body are joined on both sides in the width direction to form a waist opening and a leg opening,
    An elastic film is laminated between the first sheet layer and the second sheet layer from the edge portion of at least one of the waist opening and the leg opening to the subsequent portion, and the first sheet layer and the second sheet layer Has a stretchable region stretched in the width direction, directly or indirectly joined by a large number of sheet joints arranged at intervals,
    At the edge portion of the opening in the stretchable region, at least one of the first sheet layer and the elastic film and between the second sheet layer and the elastic film is bonded by a stretchable hot melt adhesive,
    In the region having no stretchable hot melt adhesive in the stretchable region, the elastic film shrinks in the width direction due to the shrinkage of the elastic film, and is extensible in the width direction,
    In the region having the stretchable hot melt adhesive, the elastic film and the stretchable hot melt adhesive are contracted in the width direction due to contraction, and can be expanded in the width direction.
    A pants-type disposable diaper characterized by that.
  2. 　前記第１シート層及び第２シート層のうち前記弾性フィルムの外側に位置する方と弾性フィルムとの間にのみ、前記伸縮ホットメルト接着剤が設けられている、請求項１記載のパンツタイプ使い捨ておむつ。 The pants-type disposable according to claim 1, wherein the stretchable hot-melt adhesive is provided only between the elastic film and the one located on the outer side of the elastic film among the first sheet layer and the second sheet layer. Diapers.
  3. 　前記脚開口の縁は、脚周りに沿う曲線状に形成されており、
    　前記脚開口の縁部分には、矩形状の前記伸縮ホットメルト接着剤による接着部分が複数前後方向に並び、かつその幅方向中央側の端部が脚周りに沿って階段状をなしている、請求項１記載のパンツタイプ使い捨ておむつ。     The edge of the leg opening is formed in a curved shape around the leg,
    At the edge portion of the leg opening, a plurality of adhesive portions by the stretchable hot melt adhesive in a rectangular shape are arranged in the front-rear direction, and the end portion on the center side in the width direction forms a step shape around the leg, The pants-type disposable diaper according to claim 1.
  4. 　前記開口の縁部分には、幅方向に細長く延びる前記伸縮ホットメルト接着剤による接着部分が前後方向に間隔を空けて複数設けられている、請求項１～３のいずれか１項に記載のパンツタイプ使い捨ておむつ。 The pant according to any one of claims 1 to 3, wherein a plurality of adhesive portions made of the stretchable hot melt adhesive extending in the width direction are provided at the edge portion of the opening at intervals in the front-rear direction. Type disposable diapers.
  5. 　前記伸縮ホットメルト接着剤の接着部分は、前後方向寸法が１．０～５．０ｍｍ、前後方向間隔が１．０～５．０ｍｍである、請求項４記載のパンツタイプ使い捨ておむつ。 5. The pants-type disposable diaper according to claim 4, wherein the adhesive portion of the stretchable hot melt adhesive has a longitudinal dimension of 1.0 to 5.0 mm and a longitudinal distance of 1.0 to 5.0 mm.
PCT/JP2016/074967 2015-09-30 2016-08-26 Pants-type disposable diaper WO2017056807A1 (en)

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