WO2017056807A1 - Couche jetable de type culotte - Google Patents

Couche jetable de type culotte 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
English (en)
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/fr

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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

Landscapes

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

Abstract

La présente invention vise à permettre à des bords d'ouverture d'être fortement serrés, tandis que les bords d'ouverture et des parties s'étendant depuis ces derniers sont sous la forme de structures qui sont étirables en raison d'un film élastique unique. Le problème peut être résolu par une couche jetable de type culotte comprenant des régions étirables (80) qui sont étirables latéralement et situées au-dessus de zones s'étendant depuis une ouverture de taille et des ouvertures de jambe. Dans les régions étirables (80), un film élastique (30) est stratifié entre une première couche de feuille (20A) et une seconde couche de feuille (20B), et la première couche de feuille (20A) et la seconde couche de feuille (20B) sont collées directement ou indirectement au niveau d'un grand nombre de parties de liaison de feuille (40) disposées à certains intervalles. Au niveau des bords d'ouverture des régions étirables (80), au moins une parmi la première couche de feuille (20A) et la seconde couche de feuille (20B) est collée sur le film élastique (30) avec un adhésif thermofusible étirable (90). La région avec l'adhésif thermofusible étirable (90) se contracte latéralement en raison d'une contraction du film élastique (30) et de l'adhésif thermofusible étirable (90) et est étirable latéralement.
PCT/JP2016/074967 2015-09-30 2016-08-26 Couche jetable de type culotte WO2017056807A1 (fr)

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JP2015-195456 2015-09-30
JP2015195456A JP6137712B2 (ja) 2015-09-30 2015-09-30 パンツタイプ使い捨ておむつ

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019131057A1 (fr) * 2017-12-28 2019-07-04 ユニ・チャーム株式会社 Procédé de fabrication d'article absorbant, et dispositif de fabrication de particule absorbante
RU2774532C2 (ru) * 2017-12-28 2022-06-21 Юничарм Корпорейшн Способ и устройство для изготовления впитывающего изделия

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6370965B1 (ja) * 2017-06-13 2018-08-08 大王製紙株式会社 パンツタイプ使い捨ておむつ
JP6442017B1 (ja) * 2017-09-27 2018-12-19 大王製紙株式会社 使い捨て着用物品

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008515479A (ja) * 2004-10-04 2008-05-15 エスセーアー・ハイジーン・プロダクツ・アーベー 弾性ウェブ材を具備してなる吸収用品
WO2008126708A1 (fr) * 2007-04-10 2008-10-23 Zuiko Corporation Procédé de production d'article à porter jetable
JP2009084735A (ja) * 2007-09-28 2009-04-23 Daio Paper Corp 使い捨て水着及びその包装体、並びにその製造方法
JP2013188379A (ja) * 2012-03-14 2013-09-26 Daio Paper Corp パンツタイプ使い捨ておむつ及びその製造方法
JP2014221171A (ja) * 2013-05-14 2014-11-27 株式会社リブドゥコーポレーション 吸収性物品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008515479A (ja) * 2004-10-04 2008-05-15 エスセーアー・ハイジーン・プロダクツ・アーベー 弾性ウェブ材を具備してなる吸収用品
WO2008126708A1 (fr) * 2007-04-10 2008-10-23 Zuiko Corporation Procédé de production d'article à porter jetable
JP2009084735A (ja) * 2007-09-28 2009-04-23 Daio Paper Corp 使い捨て水着及びその包装体、並びにその製造方法
JP2013188379A (ja) * 2012-03-14 2013-09-26 Daio Paper Corp パンツタイプ使い捨ておむつ及びその製造方法
JP2014221171A (ja) * 2013-05-14 2014-11-27 株式会社リブドゥコーポレーション 吸収性物品

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019131057A1 (fr) * 2017-12-28 2019-07-04 ユニ・チャーム株式会社 Procédé de fabrication d'article absorbant, et dispositif de fabrication de particule absorbante
JP2019118552A (ja) * 2017-12-28 2019-07-22 ユニ・チャーム株式会社 吸収性物品の製造方法、及び、吸収性物品の製造装置
CN111526844A (zh) * 2017-12-28 2020-08-11 尤妮佳股份有限公司 吸收性物品的制造方法和吸收性物品的制造装置
CN111526844B (zh) * 2017-12-28 2022-04-22 尤妮佳股份有限公司 吸收性物品的制造方法和吸收性物品的制造装置
RU2774532C2 (ru) * 2017-12-28 2022-06-21 Юничарм Корпорейшн Способ и устройство для изготовления впитывающего изделия
JP7107680B2 (ja) 2017-12-28 2022-07-27 ユニ・チャーム株式会社 吸収性物品の製造方法、及び、吸収性物品の製造装置

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