WO2014084236A1 - Disposable diaper - Google Patents

Disposable diaper Download PDF

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Publication number
WO2014084236A1
WO2014084236A1 PCT/JP2013/081862 JP2013081862W WO2014084236A1 WO 2014084236 A1 WO2014084236 A1 WO 2014084236A1 JP 2013081862 W JP2013081862 W JP 2013081862W WO 2014084236 A1 WO2014084236 A1 WO 2014084236A1
Authority
WO
WIPO (PCT)
Prior art keywords
leg
product
width direction
disposable diaper
longitudinal direction
Prior art date
Application number
PCT/JP2013/081862
Other languages
French (fr)
Japanese (ja)
Inventor
坂口　智
Original Assignee
ユニ・チャーム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ユニ・チャーム株式会社 filed Critical ユニ・チャーム株式会社
Priority to CN201380061881.1A priority Critical patent/CN104812348B/en
Publication of WO2014084236A1 publication Critical patent/WO2014084236A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—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 shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49001—Absorbent articles specially adapted to be worn around the waist, e.g. diapers having preferential bending zones, e.g. fold lines or grooves
    • 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
    • A61F13/45—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 shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49014—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the side panels
    • 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
    • A61F13/45—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 shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49017—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means being located at the crotch region
    • 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
    • A61F13/45—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 shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/494—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means
    • A61F13/49406—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means the edge leakage prevention means being at the crotch region

Definitions

  • the present invention relates to a disposable diaper.
  • the diaper is an open type diaper, and includes an absorbent body and a side flap that extends outward in the product width direction from the absorbent body.
  • a main elastic material is disposed on the outer side in the product width direction from the absorbent body.
  • a diaper in which a secondary elastic material is disposed on the outer side in the product width direction than the material is disclosed.
  • a fastening member for fastening the product width direction outer side end portion of the rear waist region to the front waist region is provided outside the side flap in the product width direction (for example, Patent Document 1, No. 1). FIG. 1, FIG. 2, pages 4 to 5).
  • the main elastic material is arranged around the wearer's leg.
  • the auxiliary elastic material is disposed on the outer side in the product width direction than the main elastic material in the vicinity of the longitudinal direction end of the disposable diaper.
  • the side part in the product width direction of the diaper is contracted by the secondary elastic material, and side leakage such as urine can be prevented.
  • the disposable diaper described above has the following problems.
  • the wearer's body is not symmetrical in front and back, and the buttocks located on the dorsal side is longer than the ventral side.
  • Conventional diapers are intended to cover the wearer's body with side flaps that extend outward in the width direction from the absorbent body.
  • the front waistline and the back of the wearer are arranged on the stomach side of the wearer.
  • the rear waistline region arranged on the side is symmetrical.
  • the conventional diaper is not based on the wearer's characteristics, the portion covering the buttocks is small, and the front and rear side flap shapes are also symmetrical. If an expansion / contraction member is inserted in this state, the part which covers a collar part by shrinkage will become small, and cannot be covered. Therefore, the conventional diaper is difficult to be disposed along the body line.
  • the rear waistline region corresponding to the wearer's buttocks side is pulled. Specifically, the area of the side flaps in contact with the buttocks is insufficient, the side flaps are arranged inwardly (in the wearer's body side) in a convex shape, and the side flaps are stretched. Therefore, the rear waistline region may be shifted to the crotch side, and it may be difficult to raise and lower the legs.
  • this invention is made
  • a disposable diaper according to the present disclosure (disposable diaper 10) has a front waistline region, a rear waistline region, and a crotch region located between the front waistline region and the rear waistline region, and from the front waistline region
  • An absorber having a product longitudinal direction toward the rear waistline and a product width direction orthogonal to the product longitudinal direction, straddling the crotch region and extending to at least one of the front waistline region and the rear waistline region
  • a side flap that straddles the front waistline region, the crotch region, and the rear waistline region and that is disposed on the outer side in the product width direction than the absorber, and a product width direction from the rear waistline region of the side flap
  • a pair of fastening tapes extending outward and fastened to the front waistline region, the side flaps having leg openings recessed toward the center in the product width direction of the absorber
  • a leg stretchable part that is disposed on the inner side in the product width direction than the leg opening and
  • the area between the straight line passing through the center in the width direction and parallel to the product longitudinal direction is wider than the area between the front leg opening and the straight line passing through the center in the product width direction and parallel to the product longitudinal direction.
  • a collar stretchable part that is disposed across the crotch region and the rear waistline region and stretches in the product longitudinal direction is disposed, Elongation
  • the gist is that the rate is higher than the elongation rate of the leg stretchable part.
  • FIG. 1 is a developed plan view of a disposable diaper according to the present embodiment.
  • FIG. 2 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in FIG.
  • FIG. 3 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in FIG.
  • FIG. 4 is a view showing a state in which the disposable diaper according to this embodiment is attached to the wearer.
  • FIG. 1 is a developed plan view of a disposable diaper 10 according to this embodiment.
  • FIG. 2 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in FIG.
  • FIG. 3 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in FIG.
  • the developed plan view shown in FIG. 1 shows a state in which the elastic members 81 of the leg stretchable part 75 and the leg side gathers 80 are stretched until the folds such as the top sheet 50 and the side flap 70 constituting the disposable diaper are not formed. It is.
  • the disposable diaper 10 has a front waistline region 20, a crotch region 25, and a back waistline region 30.
  • the front waistline region 20 is a portion in contact with the wearer's front waistline portion (abdomen portion).
  • the rear waistline region 30 is a portion in contact with the rear waistline portion (back portion) of the wearer.
  • the crotch region 25 is located between the front waistline region 20 and the back waistline region 30.
  • the direction from the front waistline region 20 to the rear waistline region 30 is referred to as a product longitudinal direction L
  • a direction orthogonal to the product longitudinal direction L is referred to as a product width direction W.
  • the disposable diaper 10 includes an absorbent body 40 that straddles the crotch region 25 and extends from the crotch region 25 toward at least one of the front waistline region 20 and the rear waistline region 30.
  • the absorber 40 includes an absorbent core 40a and a core wrap 40b.
  • the absorbent core 40a can be made of the same material as that of a conventional disposable diaper, and can be appropriately formed using a known member or material such as pulverized pulp or a superabsorbent polymer.
  • the absorbent core 40a is wrapped with a sheet-like core wrap 40b.
  • the core wrap 40b is a sheet that covers the absorbent core 40a. At least a part on the skin surface side of the core wrap 40b is constituted by various fiber nonwoven fabrics or tissue sheets having liquid permeability. For example, air-through nonwoven fabric of weight approximately 10 ⁇ 30g / m 2, spun bond nonwoven fabric, SMS can be used (spunbond - spunbond - meltblown) nonwoven or tissue sheet of the mass about 10 ⁇ 30g / m 2,.
  • a liquid-permeable top sheet 50 is provided on the surface side (skin contact surface side) of the absorber 40.
  • a liquid-impermeable back sheet 60a is provided on the back side (non-skin contact surface side) of the absorber 40.
  • An exterior sheet 60 is provided on the back surface side (non-skin contact surface side) of the back sheet 60a.
  • Side flaps 70 are respectively provided on side edges of the absorbent body 40 in the product width direction W.
  • the side flap 70 straddles the front waistline region 20, the crotch region 25, and the rear waistline region 30, and is disposed outside the absorbent body 40 in the product width direction.
  • the side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets.
  • a pair of leg openings 35 are formed in the side flap 70 of the disposable diaper 10.
  • the leg opening 35 is provided at a side end portion in the product width direction of the disposable diaper, and is a portion that is disposed around the leg of the wearer while the disposable diaper is worn by the wearer.
  • the leg opening 35 is recessed toward the center of the absorbent main body in the product width direction.
  • the leg opening 35 includes a rear leg opening 35R positioned rearward of the product longitudinal center O4 of the leg opening 35 and a front leg opening positioned forward of the product longitudinal center O4 of the leg opening 35. 35F.
  • the area between the rear leg opening 35R and the straight line L1 passing through the center in the product width direction and parallel to the product longitudinal direction is parallel to the product leg direction through the front leg opening 35F and the center in the product width direction. It is wider than the area between the straight lines.
  • the area is the area of the stretched state in which the elastic members 81 of the leg stretchable part 75 and the leg side gathers 80 are stretched until the wrinkles such as the top sheet 50 and the side flap 70 constituting the disposable diaper are not visually observable. is there.
  • the pair of side flaps 70 are each provided with a fastening tape 90.
  • the fastening tape 90 extends along the product width direction W in the rear waistline region 30, and is fastened to the non-skin contact surface of the front waistline region 20, thereby holding the disposable diaper 10 on the wearer's body.
  • the target portion 95 is disposed on the non-skin contact surface in the front waistline region, and is configured such that the pair of fastening tapes 90 are fixed to each other.
  • the front waistline region 20, the rear waistline region 30, and the fastening tape 90 constitute a waistline holding portion.
  • the waistline holding portion of the rear waistline region 30 is a range extending in the product width direction from the region where the engaging portion of the fastening tape 90 is provided.
  • the waistline holding portion of the front waistline region 20 is a range extending in the product width direction from the region where the target portion 95 is provided.
  • the disposable diaper 10 includes a crotch expansion / contraction part 200 disposed in a region overlapping the absorber in the crotch region 25.
  • the configuration of the crotch expansion / contraction unit 200 will be described in detail later.
  • the side flap 70 is provided with a pair of leg stretchable parts 75 that are arranged on the inner side in the product width direction than the leg opening 35 and can be stretched in the product longitudinal direction L.
  • the leg stretchable part 75 is longer than the crotch stretchable part 200 in the product longitudinal direction L and is provided outside the crotch stretchable part 200 in the product width direction W.
  • the leg expansion / contraction part 75 should just be comprised so that the leg opening part 35 can be expanded-contracted in a product longitudinal direction, may be arrange
  • a buttock stretchable part 77 that is disposed across the crotch region 25 and the rear waistline region 30 and stretches in the product longitudinal direction is disposed.
  • the leg stretchable portion 75 and the heel stretchable portion 77 are portions that contract substantially in the longitudinal direction of the product with thread rubber or the like, and are a concept that excludes the portion where the stretchable sheet is disposed in a state where the contraction force is not exerted. .
  • the configuration of the leg stretchable part 75 and the heel stretchable part 77 will be described in detail later.
  • a pair of leg side gathers 80 extending along the product longitudinal direction L are provided inside the pair of leg stretchable portions 75 (near the center in the product width direction W).
  • the leg side gathers 80 are provided at the inner end of the side flap 70 in the product width direction, and are erecting and expanding gathers disposed on the inner side in the product width direction than the leg stretchable parts 75.
  • the leg side gathers 80 are arranged on the inner side in the product width direction than the leg stretchable parts 75.
  • the leg side gathers 80 can adopt a conventionally well-known configuration. Specifically, the leg side gathers 80 may be formed of a sheet material different from the side flaps 70.
  • a waist stretchable portion 85 that can be stretched in the product width direction is provided.
  • the waist elastic part 85 contracts between the fastening tapes in the product width direction.
  • the waist elastic part 85 is constituted by an elastic sheet.
  • the members constituting the waist elastic part 85 are not particularly limited, but it is preferable to use a member that is as thin as possible, has low bending rigidity, and has a small width ratio.
  • the waist stretchable portion 85 can easily bend along the body, and the waist stretchable portion 85 is placed along the body without applying a load to the wearer's body. Can be fitted.
  • the waist stretchable portion 85 by configuring the waist stretchable portion 85 with a material having a small width ratio, it is possible to suppress contraction in the product longitudinal direction of the disposable diaper when the disposable diaper extends in the product width direction, and to dispose the disposable diaper around the wearer's waist It is possible to suppress the diaper from being pulled down to the crotch side.
  • a stretchable film having a basis weight of 20 to 45 g / m 2 is used as the waist stretchable portion 85.
  • the waist stretchable portion 85 is stretched by 1.5 to 2.5 times the length in the non-stretched state (natural state) and then adhered to the exterior sheet 60 by a hot melt adhesive or heat treatment. .
  • the waist elastic part 85 is disposed between the exterior sheet 60 and the back sheet 60a.
  • the waist stretchable portion 85 is disposed between the core wrap 40b and the back sheet 60a or the exterior sheet 60. It may be.
  • the position of the waist elastic part is not particularly limited. Further, in a region where the absorbent body is not disposed, it may be disposed between the side flap 70 and the back sheet 60a or the exterior sheet 60.
  • the waist stretchable part according to the present embodiment is configured to stretch in the product width direction
  • the waist stretchable part may be configured to stretch in the product width direction and the product longitudinal direction.
  • Fastening tape 90 is attached to the region of the side flap 70 corresponding to the rear waistline region 30.
  • the fastening tape 90 is provided with a base sheet 91 connected to the side flap 70, an engagement hook (not shown) as a plurality of engagement members, and a hook sheet 92 fixed to the base sheet 91; Is provided.
  • the hook sheet 92 is an area where an engagement member is provided, and the above-described waistline holding portion is an area extending from the hook sheet 92 in the product width direction.
  • the hook sheet 92 is fixed to the base sheet 91, specifically, bonded.
  • the hook sheet 92 and the base sheet 91 are preferably joined so that the rigidity of the fastening tape 90 does not become higher than necessary.
  • the hook sheet 92 and the base sheet 91 are joined by a hot melt adhesive applied intermittently such as a dot shape, a line shape, or a spiral shape.
  • the hook sheet 92 and the base sheet 91 may be joined by heat sealing or the like.
  • the base sheet 91 is composed of one or two or more non-woven fabrics stacked.
  • a nonwoven fabric manufactured by a manufacturing method such as spunbond (SB) or spunbond-meltblown-spunbond (SMS) can be used.
  • the basis weight of the nonwoven fabric constituting the base sheet 91 is 30 to 120 g / m 2 , preferably 40 to 90 g / m 2 .
  • the target portion 95 is provided on the non-skin contact side surface of the exterior sheet 60 in the front waistline region.
  • the target portion 95 is configured so that the engaging hook of the fastening tape is hooked, and functions as a loop of a hook and loop locking system.
  • an air-through nonwoven fabric can be used as the target portion.
  • a fiber nonwoven fabric made of a polyolefin-based thermoplastic synthetic resin fiber or a polyolefin-based thermoplastic synthetic resin film can be used.
  • the loop attached to the target portion can be formed of a polyolefin-based thermoplastic synthetic resin.
  • a non-woven fabric which is a bulky non-woven fabric and which is partly embossed to prevent fluffing on the non-woven fabric surface may be used.
  • the exterior sheet 60 of the disposable diaper is formed of non-woven fabric, and the design indicating the attachment position of the fastening tape 90 is printed on the back sheet 60a or the non-skin contact side surface of the exterior sheet 60, or the design sheet is printed on the back sheet. It can also be set as the target portion by arranging it on the non-skin contact side of 60a or the exterior sheet 60.
  • the area between the rear leg opening and the straight line L1 passing through the center in the product width direction and parallel to the product longitudinal direction is parallel to the product longitudinal direction through the front leg opening and the center in the product width direction. It is wider than the area between the straight line L1. Therefore, the side flap located behind the product longitudinal center of the leg opening extends outward in the product width direction from the side flap located forward of the product longitudinal center of the leg opening, The area that can be covered is wide.
  • the straight line L1 passing through the center in the product width direction and parallel to the product longitudinal direction is a straight line passing through the center in the product width direction of the disposable diaper and parallel to the product longitudinal direction.
  • the wearer's body is not symmetric in the front-rear direction and has a larger surface area on the back side than on the abdominal side. This is because there is a butt that bulges outward on the back side of the wearer.
  • the product longitudinal center O4 of the leg opening is likely to be a position corresponding to the product longitudinal center of the wearer's crotch.
  • the area between the rear leg opening located behind the product longitudinal center of the leg opening and the straight line passing through the center in the product width direction and parallel to the product longitudinal direction is the product longitudinal direction of the leg opening.
  • the leg opening 35 on the side of the rear waist region is turned up toward the inner side in the product width direction while being worn, and the buttocks of the wearer are exposed.
  • the product width direction end of the back waistline is caught inside when wearing, and the wearer's buttocks are exposed.
  • the back waistline may shift to the crotch side, and it may be difficult to raise and lower the legs.
  • a disposable diaper can be arrange
  • the front waistline side portion of the leg opening 35 of the disposable diaper is arranged in the vicinity of the wearer's ridge. Therefore, on the other hand, the part of the leg opening part 35 of the disposable diaper on the rear waistline region side is arranged on the gradually inflating part of the wearer's buttocks.
  • the side flaps are arranged along the ridges while the side flaps are arranged along the ridges. Can be arranged.
  • a plurality of convex portions 36 that are convex outward in the product width direction are formed in the rear leg opening 35R.
  • the convex portion 36 is a portion protruding outward in the product width direction from the region before and after the leg opening.
  • the leg opening 35 is a portion that hits the wearer's leg and is a portion that easily enters the inside of the disposable diaper 10. Therefore, it is preferable that the leg opening 35 covers the body more widely, and it is particularly desirable that the rear leg opening 35R be disposed so as to cover the body widely.
  • the convex 36 is formed so that the pressure on the skin can be more dispersed. Is preferred. Specifically, stress is likely to concentrate near the base end of the fastening tape 90, and it may overlap in the front and back when the disposable diaper 10 is worn, so that the pressure on the skin can be dispersed. It is preferred that
  • a recess is formed that is recessed toward the inside in the product width direction.
  • the recessed portion 37 is a portion that is recessed inward in the product width direction from the front and back regions of the leg opening. Since the concave portion 37 is concave, it is easy to follow the wearer's ridge portion. For this reason, the side flap 70 and the leg expansion / contraction part 75 fit by a wearer, and the crotch region 25 from the front waistline area 20 of the disposable diaper 10 can be made to follow a body stably irrespective of a wearer's movement.
  • the concave portion 37 continues to fit into the ridge and maintains the wide state without the width of the absorbent body 40 narrowing. it can.
  • the convex part 36 and the concave part 37 need to be along the wearer's body in addition to the pressure relief on the skin.
  • leg stretchable part 75 is arranged along the product longitudinal direction L outside the absorbent body 40 in the product width direction and is configured to be stretchable in the product longitudinal direction L. .
  • the leg elastic part 75 is disposed between the side flap 70 and the exterior sheet 60.
  • the leg stretchable part 75 is disposed between the back sheet 60a and the side flap 70.
  • the leg stretchable part 75 is configured by a predetermined number of elastic members (in the example of FIG. 1, two elastic members).
  • the elastic member according to the present embodiment is made of polyurethane elastic fiber or natural rubber.
  • the collar expansion / contraction part 77 is configured by a predetermined number of elastic members (in the example of FIG. 1, one elastic member).
  • the elastic member according to the present embodiment is made of polyurethane elastic fiber or natural rubber.
  • the elastic member that constitutes the collar expansion / contraction part 77 of the present embodiment is a thread rubber arranged along the product longitudinal direction. Accordingly, the entire region of the side flap 70 where the heel expansion / contraction portion is provided can be evenly contracted so that the side flap 70 can follow the heel of the swelled wearer, so that the region can be covered without turning over the region. it can.
  • the hip expansion / contraction section 77 is disposed between the side flap 70 and the exterior sheet 60.
  • the collar expansion / contraction part 77 is disposed between the back sheet 60a and the side flap 70.
  • the product longitudinal direction center O3 of the leg stretchable part 75 is located in front of the product longitudinal direction center O1 of the disposable diaper in the extended state of the disposable diaper.
  • the product longitudinal center O4 of the leg opening 35 is located in front of the product longitudinal center O1 of the disposable diaper.
  • the leg stretchable part 75 is disposed.
  • the length in the product longitudinal direction L of the rear waistline region 30 is set.
  • the front waistline region 20 can be provided longer than the length in the product longitudinal direction L.
  • the wearer's body is not symmetrical in the front-rear direction, and the back side is longer than the ventral side.
  • the disposable diaper is not disposed along the body line that is asymmetrical in the front-rear direction.
  • the amount of skin expansion / contraction (the amount of change in length) on the surface of the wearer's body ) Is larger on the dorsal side (buttock) than on the ventral side.
  • the length of the product longitudinal direction L of the rear waistline region 30 of the disposable diaper 10 in the natural state is the same as the length of the product longitudinal direction L of the front waistline region 20 of the disposable diaper 10 in the natural state. It is in a state of being stretched on the back side of the wearer.
  • the length in the product longitudinal direction L of the rear waist region 30 of the disposable diaper 10 in the natural state is set to the product longitudinal direction L of the front waist region 20 in the natural state of the disposable diaper 10. Therefore, the wearer's buttocks can be appropriately covered. Therefore, even if there is a movement of the wearer, the front waistline region 20 and the back waistline region 30 of the disposable diaper 10 are in a direction along the product longitudinal direction L due to the movement of the wearer's skin. It becomes possible to suppress the situation of moving and cover the buttocks appropriately.
  • the product longitudinal center O3 of the leg stretchable part 75 and the product longitudinal center O4 of the leg opening 35 are arranged in front of the product longitudinal center O1 of the disposable diaper, thereby moving the leg opening forward. It can be formed (near the ventral side).
  • the wearer's legs extend toward the front of the body. In the state engaged by the fastening tape 90, the leg opening 35 is in the front position, so that the diaper is more suitable for the wearer's body. Therefore, it becomes easy for the wearer to move his / her foot during wearing, and the rear waistline region can be made difficult to stick.
  • the buttocks stretchable portion 77 is disposed across the crotch region 25 and the rear waistline region 30, and the product longitudinal center O5 of the buttocks stretchable portion 77 is more than the center O3 of the leg stretchable portion 75 in the product longitudinal direction.
  • the rear part of the leg elastic part 75 and the area outside the product width direction are contracted by the hip elastic part 77, and the vicinity of the leg opening part in the rear waistline region (the end part on the crotch side of the hip part) can be pulled up backward and in the width direction.
  • Drawing 4 is a figure showing typically the state where a disposable diaper was equipped.
  • the stretch rate of the buttocks stretchable part 77 is higher than the stretch rate of the leg stretchable part 75. Since the extension rate of the buttocks stretchable part is higher than the extension rate of the leg stretchable parts, the diaper can be brought near the buttocks. Therefore, a disposable diaper can be gathered and gathered to a wearer's buttocks and the base of the back of a leg, and the pulling when a wearer raises and lowers a leg can be controlled.
  • the buttocks elastic part 77 is arrange
  • the leg expansion / contraction part 75 is arrange
  • the hip elastic part 77 and the leg elastic part 75 are arranged, and the extension rate of the hip elastic part is higher than the extension rate of the leg elastic part 75.
  • the generated wrinkles extend outward from the center in the product width direction and extend from the crotch region toward the rear waistline region. Therefore, with the disposable diaper attached, the side flaps on the back waistline side can be pulled up to the waist opening side while pulling the side flaps on the outside in the width direction. Can be prevented.
  • the disposable diaper is pulled in the longitudinal direction of the product with the crotch region of the disposable diaper applied to the wearer's crotch and fixed with fastening tape or the like.
  • the side flaps may be pulled up by the fastening force of the fastening tape, and the disposable diaper is pulled and worn in a straight line connecting the fastening tape and the product longitudinal center of the leg opening.
  • the side flaps cannot be arranged to cover the person's buttocks.
  • the side flap is pulled up regardless of the fastening force of the fastening tape. Deformation that does not occur can be suppressed. Furthermore, it is not necessary to pull up and fasten the fastening tape in order to pull up the side flaps, and it can be gently wound around the waist of the wearer, improving the wearing feeling.
  • the natural state of the disposable diaper means a case where the disposable diaper 10 is taken out of the package and measured after being left in an atmosphere of 20 ° C. ⁇ 2 ° C. and a relative humidity of 60% ⁇ 5% RH for 60 minutes.
  • the front end portion 77F of the buttocks expansion / contraction portion is located behind the center of the leg opening 35 in the product longitudinal direction. Therefore, the rear part of the leg stretchable part and the region on the outer side in the product width direction are contracted by the buttock stretchable part 77, so that the vicinity of the leg opening part (the end part on the crotch side of the buttock) can be pulled rearward.
  • the disposable diaper when wearing disposable diapers, for example, the disposable diaper is pulled in the front-rear direction with the crotch area of the disposable diaper applied to the wearer's inseam and fixed with fastening tape or the like.
  • the disposable diaper When worn in this manner, the disposable diaper may be pulled between the fastening portion of the fastening tape and the crotch region, and the leg opening 35 may not be disposed around the wearer's leg.
  • the buttock side has a larger area of the buttock than the wearer's stomach side, the product width direction end of the rear waistline region may be caught inside when wearing, and a part of the buttock may be exposed.
  • the disposable diaper can be brought close to the rear waistline region 30 by the buttocks expansion / contraction part 77, and the problem that the wearer's buttocks are exposed can be suppressed.
  • the distance D1 between the buttocks stretchable part 77 and the leg stretchable part 75 in the product width direction is desirably 10 mm to 30 mm.
  • the distance between the buttocks stretchable part 77 and the leg stretchable part 75 is longer than 30 mm, the buttocks stretchable part 77 and the leg stretchable part 75 stretch independently of each other, and the buttocks stretchable part 77 and the leg stretchable part 75 are interlocked. It is hard to do.
  • the distance between the heel stretchable portion and the leg stretchable portion in the product width direction in the extended state of the disposable diaper 10 is 10 mm to 30 mm, the heel stretchable portion 77 and the leg stretchable portion 75 are easily interlocked.
  • the disposable diaper 10 is enclosed in a package or the like, use a sample that is removed from the package and left in that state for 12 hours in an atmosphere of 20 ° C. ⁇ 2 ° C. and relative humidity 60% ⁇ 5% RH.
  • the length of the disposable diaper 10 in this state that is, the naturalness of the disposable diaper 10 is adjusted by using a spring measure manufactured by Shinwa Measurement Co., Ltd.
  • the length of the leg extension 75 in the state is measured.
  • the length of the stretched state is the length of the leg stretchable part 75 when the disposable diaper 10 is stretched from a natural state to a state where wrinkles due to the elastic member cannot be visually confirmed.
  • the above measurement was performed in each state, and the average value was defined as the length. Based on the measured length, the area can be calculated.
  • the leg opening 35 has a convex shape that extends from the outer side in the product width direction toward the inner side in the product width direction, and the inner end portion 35I that is located on the innermost side in the product width direction in the leg opening 35 in the stretched state of the disposable diaper 10 and the leg elastic part
  • the distance D2 to 75 is shorter than the distance in the product width direction between the leg stretchable part and the heel stretchable part, and is 15 mm or less.
  • the contraction force by the leg stretchable part 75 acts on the inner end of the leg opening 35. Therefore, there is a possibility that the leg opening 35 cannot be properly contracted by the leg expansion / contraction part 75.
  • the inner end 35I of the leg opening 35 is a portion that is sandwiched between the legs of the wearer in a worn state and is in close contact with the wearer.
  • the distance between the inner end 35I of the leg opening 35 and the leg stretchable part is 15 mm or less, at least a portion of the leg opening that is in close contact with the wearer can be contracted and arranged along the legs of the wearer.
  • a frill-like contraction part contracted by the leg extension part 75 and the buttocks extension part 77 is formed.
  • the leg stretchable part 75 and the buttocks stretchable part 77 can bring the frill-like contracted part into close contact with the body.
  • the distance between the inner end 35I located at the innermost side in the product width direction and the leg stretchable part in the leg opening is shorter than the distance between the leg stretchable part and the heel stretchable part. It is easy to maintain the shape in which the entire region in which the buttock expansion / contraction part of the side flap is arranged is widened by suppressing the entanglement of the end part and disposing the heel expansion / contraction part from the crotch part to the rear waistline region.
  • the frill formed by the leg elastic part 75 and the collar elastic part 77 expands and contracts in the product longitudinal direction, the frill extends along the product width direction.
  • This frill wrinkles becomes a support and can prevent the product width direction end part of the rear waistline region from getting inward in the width direction.
  • the buttocks stretchable portion 77 may be stretched over the entire region, or the regions at both ends thereof may be in a non-stretched state.
  • wrinkles are suppressed in the vicinity of the rear leg opening 35R by making the regions (10 mm or less, 2 mm or more region, more preferably 5 mm or less, 2 mm or more region) at both ends of the collar expansion / contraction portion 77 non-stretchable. You can do it. Therefore, the vicinity of the rear leg opening 35R can more closely follow the body.
  • an adhesive such as an HMA adhesive at the end of the collar expansion / contraction part 77, the edge of the rear leg opening 35R where the end of the collar expansion / contraction part 77 is positioned can be softened.
  • the inner end 35I of the leg opening is located on the center line L2 along the product longitudinal direction through the center of the leg stretchable part and the heel stretchable part in the product width direction in the natural state of the disposable diaper 10.
  • the inner side edge part of a leg opening part can be pulled up by a leg elastic part and a collar part elastic part, and the entrainment of the inner side edge part of a leg opening part can be prevented. Therefore, the inner side edge part of a leg opening part can be arrange
  • the elongation rate of the leg stretchable part 75 is preferably 1.7 to 2.4 times.
  • the extension rate of the leg stretchable part 75 in the natural state of the disposable diaper is set to 1.9 to 2.2 times.
  • the extension rate of the leg stretchable part 75 means the degree of extension of the leg stretchable part, and is defined as follows.
  • Elongation rate (length of leg stretchable part in stretched state) ⁇ (length of leg stretchable part in natural state)
  • the extension ratio of the heel expansion / contraction part 77 is 1.6 to 2.4 times.
  • the expansion rate of the buttocks expansion / contraction part 77 means the degree of expansion of the buttocks expansion / contraction part, and is defined as follows.
  • Elongation rate (length of the heel expansion / contraction part in the extended state) ⁇ (length of the heel expansion / contraction part in the natural state)
  • the disposable diaper 10 is enclosed in a package or the like, the disposable diaper 10 is taken out from the package. Next, mark both ends of the leg stretchable part and the heel stretchable part.
  • each sample was left in an atmosphere of 20 ° C. ⁇ 2 ° C. and a relative humidity of 60% ⁇ 5% RH for 60 minutes, and the length of the stretchable part in the natural state (between the marks) was measured by a spring measure manufactured by Shinwa Measurement Co., Ltd.
  • the length is measured so as to be along the elastic member by using a tape portion: vinyl chloride containing glass fiber). This length is defined as “the natural length of the leg stretchable portion” or “the natural length of the heel stretchable portion”.
  • the length of the stretched state is such that the disposable diaper 10 is stretched from the natural state to a state where wrinkles due to the elastic member cannot be visually confirmed, and the stretched length of the stretched portion (between marks) is measured by Shinwa Measurement Co., Ltd.
  • the length is measured by using a spring measure (tape part: coated with vinyl chloride containing glass fiber) so as to be along the elastic member. This length is defined as “the length of the leg stretchable portion in the extended state” or “the length of the heel stretchable portion in the extended state”.
  • the elongation percentage is measured by calculating with the above formula.
  • the crotch stretchable part 200 is configured to maintain a flat shape in a part of the crotch region when the disposable diaper is worn rather than the other part of the absorber 40.
  • the crotch stretchable portion 200 is configured to be stretchable at least in the product longitudinal direction L or the product width direction W.
  • the crotch stretchable part 200 is provided separately from the leg stretchable part 75 and overlaps the absorbent core 40a (in this embodiment, between the core wrap 40b that wraps the absorbent core 40a and the backsheet 60a). Position), 60% or more of the length in the product width direction of the absorbent core 40a at the overlapping position is contracted. In this way, by shrinking the portion where the absorbent core 40a is disposed by the crotch stretchable portion 200, the absorbent core 40a shrinks, and it is easy to maintain a flat shape compared to the portion where the absorbent core 40a does not shrink. Become.
  • the absorbent core 40a located in the front waistline region and the rear waistline region located outside the product longitudinal direction from the crotch stretchable portion 200 is not contracted by the crotch stretchable portion 200. Therefore, the crotch stretchable part 200 that is maintained in a flat shape at the crotch part of the disposable diaper in a state of being held around the waist / waist of the wearer by the fastening tape does not excessively adhere to the body, resulting in the crotch.
  • the stretchable part 200 is appropriately placed along the body.
  • the crotch stretchable portion 200 is stretchable along the product longitudinal direction L, the front waistline region 20 and the back waistline region 30 are easily raised by contraction of the crotch stretchable portion 200, and when worn, A flat crotch region can be formed along the body at the part.
  • the disposable diaper 10 can be stably attached so that the crotch region 25 of the disposable diaper 10 is disposed in the crotch region of the wearer by the contraction of the crotch stretchable part 200.
  • the crotch stretchable part 200 may be configured to extend to the front waistline region 20 side and the back waistline region 30 side across the center O1 of the disposable diaper 10 in the product longitudinal direction L.
  • center O2 of the crotch expansion / contraction part 200 in the product longitudinal direction L is arranged on the front waistline region 20 side with respect to the center O1 of the disposable diaper 10 in the product longitudinal direction L.
  • the amount of skin expansion and contraction (the amount of change in length) on the surface of the wearer's body ) Is larger on the dorsal side (buttock) than on the ventral side.
  • the rear waistline region 30 of the disposable diaper 10 By placing the center O2 of the crotch stretchable part 200 in the product longitudinal direction L closer to the front waistline region 20 than the center O1 of the disposable diaper 10 in the product longitudinal direction L, the rear waistline region 30 of the disposable diaper 10 in its natural state
  • the length in the product longitudinal direction L of the product can be made longer than the length in the product longitudinal direction L of the front waistline region 20. Therefore, even if there is a movement of the wearer, the front waistline region 20 and the back waistline region 30 of the disposable diaper 10 are in a direction along the product longitudinal direction L due to the movement of the wearer's skin. It becomes possible to suppress the situation of moving.
  • the crotch stretchable part 200 is preferably composed of a stretchable sheet.
  • the absorbent core 40a in the region where the stretchable sheet is disposed is uniformly shrunk, and it becomes easier to maintain a flat shape.
  • the crotch stretchable portion 200 may be configured by arranging a plurality of thread-like or band-like elastic members made of polyurethane elastic fiber or natural rubber.
  • the interval between the elastic members is 7 mm or less, more preferably 5 mm or less.
  • it is desirable that the difference in the interval between adjacent elastic members is 2 mm or less.
  • the elongation rate of the crotch stretchable part 200 is preferably 1.2 times or more and 1.8 times or less.
  • the expansion rate of the crotch expansion / contraction part 200 is set to 1.4 times.
  • the elongation rate means the degree of elongation in the expansion / contraction direction (product longitudinal direction L) of the crotch expansion / contraction part 200, and is defined as follows.
  • the elongation rate means the degree of expansion of the crotch expansion / contraction part 200 in the expansion / contraction direction (in the present embodiment, the product longitudinal direction L), and is defined as follows.
  • Elongation rate (length in the expansion / contraction direction of the crotch expansion / contraction part 200 in the maximum expansion state) / (length in the expansion / contraction direction of the crotch expansion / contraction part 200 in the natural state)
  • the measurement of an expansion rate is the same as that of the above-mentioned leg expansion-contraction part, and abbreviate
  • the elongation rate of the crotch stretchable part 200 By setting the elongation rate of the crotch stretchable part 200 to 1.2 times or more and 1.8 times or less, it is possible to suitably follow the stretch of the wearer's skin.
  • the expansion rate of the crotch expansion / contraction part 200 is less than 1.2 times, the crotch expansion / contraction part 200 is not sufficiently contracted in the natural state, and the disposable diaper 10 is compared with the case where the crotch expansion / contraction part 200 is not provided.
  • the shrinkage of the absorber region in the crotch of the wearer is small, and it becomes insufficient to take a flat shape along the body in the crotch of the wearer.
  • the expansion rate of the crotch expansion / contraction part 200 is larger than 1.8 times, the contraction dimension of the crotch expansion / contraction part 200 in the contraction direction becomes too large.
  • the disposable diaper 10 is likely to be in a close contact state, and easily displaced downward from the wearer.
  • the contraction amount of the crotch stretchable part 200 in the product longitudinal direction L may be configured to be 2 to 8% of the length of the disposable diaper 10 in the product longitudinal direction L.
  • the amount of shrinkage is the length “b (mm)” in a stretched state so that the wrinkles are sufficiently small and the surface of the sample is almost smooth, and in the natural state in the direction along the stretching direction of the sample. It is the difference from the length “a (mm)” and can be calculated by (b ⁇ a).
  • the inventor assumes that the amount of contraction of the crotch stretchable part 200 in the product longitudinal direction L is 2 to 8% of the length of the disposable diaper 10 in the product longitudinal direction L, and the process of mounting the disposable diaper 10 on the wearer. In the above, it was confirmed that the crotch stretchable part 200 is preferably easily along the wearer's body.
  • the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is larger than 8%, the crotch stretchable part 200 is contracted too much, and the disposable diaper 10 is not sufficiently short in the product longitudinal direction L. It becomes difficult to attach the diaper 10 to the wearer's body, or the disposable diaper 10 and the wearer's body are in close contact with each other in the crotch region 25 and are likely to be displaced.
  • the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is less than 2%, the effect itself of the crotch stretchable part 200 that brings the disposable diaper 10 closer to the wearer's body becomes difficult to manifest.
  • the center of the crotch expansion / contraction portion 200 in the product longitudinal direction L is arranged on the front waistline region 20 side of the center of the disposable diaper 10 in the product longitudinal direction L. Moreover, the crotch expansion / contraction part 200 is arrange
  • the thickness of the elastic member to be used and the pitch to be arranged can be appropriately selected. It is preferable that the entire side edge portion in the product width direction W of the absorbent core 40a is in a contracted state in the stretched state.
  • a notch 115 (notch 125) is formed in the crotch region 25 of the absorber 40.
  • the notch 115 and the notch 125 are regions where the absorbent core 40a constituting the absorber 40 is not present.
  • the notch 115 and the notch 125 correspond to a low-rigidity part in which the basis weight of the absorbent core 40a is lower than other parts of the absorbent core 40a.
  • the area of the notch 115 and the notch 125 is set so that the basis weight of the absorbent core 40a is lower than the other parts of the absorbent core 40a. Also good.
  • the notch 115 and the notch 125 exist along the edge of the crotch stretchable part 200 in the product longitudinal direction L. Even if the notch 115 and the notch 125 are formed, the absorbent core 40a located in the front waistline region 20 and the rear waistline region 30 is completely separated from the absorbent core 40a located in the crotch region 25. It is preferable that it is continuous especially in the product width direction.
  • the notch 115 and the notch 125 become wider in the product longitudinal direction L (the natural state of the disposable diaper 10) as they go outward in the product width direction W. With such a shape, the outer side of the absorbent core 40a in the product width direction W is more easily contracted, so that a flat “bottom” is more easily formed. Furthermore, the absorbent core 40a located closer to the front waistline region 20 than the notch 115 and the absorbent core 40a located closer to the rear waistline region 30 than the notch 125 rise from the "bottom part", and the wearer's Since it becomes easy to curve along the roundness of the body (abdomen and buttocks), the shape of the disposable diaper itself can be closer to the shape of the wearer's body.
  • the edge of the notch 115 (notch 125) close to the front waistline region 20 (rear waistline region 30) is arcuate.
  • the edge of the notch 115 (notch 125) is shaped such that the center of the arc is located in the rear waistline region 30 (front waistline region 20) with respect to the edge. With such a shape, deformation along the roundness of the wearer's body is easier and more likely to occur.
  • the width of the crotch stretchable part 200 in the product width direction W is 1 ⁇ 2 or more of the width of the absorbent core 40a in the product width direction W in the region where the crotch stretchable part of the absorbent core 40a exists.
  • the absorbent core 40a contracts and the absorbent core 40a is lifted so as to approach the wearer's body.
  • the gap between the disposable diaper 10 and the wearer can be reduced by realizing such a raised crotch region of the absorbent core 40a.
  • the width of the crotch stretchable part 200 in the product width direction W is 60% or more of the width of the absorbent body 40 (absorbent core 40a) in the product width direction W, more preferably 80% or more, disposable diapers
  • the gap between 10 and the wearer can be further reduced.
  • the width of the crotch stretchable part 200 is too narrow compared to the width of the absorbent core 40a, it is difficult to obtain the effect of lifting the absorbent core 40a described above.
  • the width of the crotch stretchable portion 200 is too wide compared to the width of the absorbent core 40a, the portion where the absorbent core 40a is not disposed contracts more than the portion where the absorbent core 40a is disposed.
  • the disposable diaper 10 is attached.
  • the width of the crotch stretch part 200 is preferably 60 to 110 mm. More preferably, the width of the crotch stretchable part 200 is 90 to 110 mm.
  • the part where the width of the absorbent core 40a is the narrowest in the product width direction W is preferably provided 10 to 60 mm in front of the center line in the product longitudinal direction.
  • the portion where the width of the absorbent core 40a is narrowest in the product width direction W is provided on the front side of the product longitudinal direction by 20 to 40 mm.
  • the crotch stretchable part 200 is preferably formed across a region where the width of the absorbent core 40a is narrowest in the product width direction W.
  • the position where the left and right thighs of the wearer are closest to each other is the front side of the center of the wearer's body in the front-rear direction. Therefore, the portion where the width of the absorbent core 40a is the narrowest in the product width direction W can be positively arranged at the position where the left and right thighs of the wearer are closest to each other by the contraction force of the crotch stretchable portion 200. . In other words, even if a wear assistant such as a mother does not align the absorbent core 40a, the absorbent core 40a is naturally aligned.
  • the manufacturing method of an absorbent article includes at least a component part forming step, a component part placing step, a leg periphery forming step, and a cutting step.
  • the components constituting the absorbent article are formed.
  • the absorbent body 40 is molded by laminating absorbent materials.
  • the elastic sheet constituting the leg stretchable part 75 on the web constituting the back sheet, the elastic sheet constituting the leg stretchable part 75, the other web such as the web constituting the top sheet, the leakproof sheet, the absorber, the leg stretchable part
  • the component parts which comprise the disposable diaper 10, such as 75 and the buttocks expansion-contraction part 77, are mounted.
  • leg stretchable part 75 and the buttocks stretchable part 77 are arranged to be stretched in the longitudinal direction at the same stretch rate.
  • the top sheet 50, the exterior sheet 60, and the back sheet 60a are cut.
  • the front end portion 77F of the buttocks stretchable portion 77 is cut, and the leg opening 35 is formed around the wearer's leg.
  • the continuous body in which the top sheet 50, the back sheet 60a, the absorber 40, and the like are arranged is cut into the size of one product along the product width direction W. Thereby, the disposable diaper 10 is manufactured.
  • the leg stretchable part 75 and the buttocks stretchable part 77 are in a natural state.
  • the leg stretchable part 75 is disposed in a region where the exterior sheet 60, the backsheet 60 a, and the side flap 70 are laminated, and the collar stretchable part 77 is composed of the exterior sheet 60 and the side flap 70.
  • the heel expansion / contraction part 77 contracts more than the leg expansion / contraction part, and the extension ratio of the heel expansion / contraction part becomes higher than the extension ratio of the leg expansion / contraction part.
  • the leg stretchable part 75 may coincide with the joined part of the leg side gathers in the product width direction, or may be arranged on the inner side in the product width direction than the joined part of the leg side gathers.
  • the elastic members constituting the leg stretchable part 75 and the collar stretchable part 77 may be one, or may be two or more.
  • an open type disposable diaper has been described as an example, but the present invention can also be applied to a pants-type disposable diaper.
  • the outer layer sheets of the front waistline and the back waistline Has an elastic element that can be contracted and extended in the product width direction W, and the disposable diaper is held around the wearer's waist by contracting them. That is, the range where the left and right side edges extending in the product longitudinal direction L are joined is the waistline holding portion.

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Abstract

A disposable diaper (10) has elastic leg sections (75), which expand and contract in a product longitudinal direction (L), disposed further to the inside in a product width direction (W) than a pair of leg opening sections (35). The area between a rear leg opening section (35R) and a straight line (L1), which passes through the center in the product width direction (W) parallel to the product longitudinal direction (L), is larger than the area between a front leg opening section (35F) and the straight line (L1), which extends in the product longitudinal direction (L) through the center in the product width direction (W). Elastic buttock sections (77), which straddle a crotch region (25) and a rear waist region (30) and expand and contract in the product longitudinal direction (L), are disposed further to the outside in the product width direction (W) than the elastic leg sections (75). The extension percentage of the elastic buttock sections (77) is higher than the extension percentage of the elastic leg sections (75).

Description

使い捨ておむつDisposable diapers
　本発明は、使い捨ておむつに関する。 The present invention relates to a disposable diaper.
　従来、オープンタイプのおむつであって、吸収体と、吸収体よりも製品幅方向外側に延出するサイドフラップを備え、吸収体よりも製品幅方向外側に主弾性材が配置され、その主弾性材よりも製品幅方向外側に副弾性材が配置されているおむつが開示されている。また、サイドフラップよりも製品幅方向外側には、後胴回り域の製品幅方向外側端部を、前胴回り域に止着するための止着部材が設けられている（例えば、特許文献１、第１図、第２図、第４頁から第５頁、参照）。 Conventionally, it is an open type diaper, and includes an absorbent body and a side flap that extends outward in the product width direction from the absorbent body. A main elastic material is disposed on the outer side in the product width direction from the absorbent body. A diaper in which a secondary elastic material is disposed on the outer side in the product width direction than the material is disclosed. Further, a fastening member for fastening the product width direction outer side end portion of the rear waist region to the front waist region is provided outside the side flap in the product width direction (for example, Patent Document 1, No. 1). FIG. 1, FIG. 2, pages 4 to 5).
　主弾性材は、着用者の脚回りに配置されている。副弾性材は、使い捨ておむつの長手方向端部近傍において、主弾性材よりも製品幅方向外側に配置されている。副弾性材によっておむつの製品幅方向側部が収縮し、尿等の横漏れを防ぐことができる。 The main elastic material is arranged around the wearer's leg. The auxiliary elastic material is disposed on the outer side in the product width direction than the main elastic material in the vicinity of the longitudinal direction end of the disposable diaper. The side part in the product width direction of the diaper is contracted by the secondary elastic material, and side leakage such as urine can be prevented.
実開平２－９６１１８号公報Japanese Utility Model Publication No. 2-96118
　しかし、上述の使い捨ておむつには、以下の問題点があった。 However, the disposable diaper described above has the following problems.
　着用者の身体は、前後対称ではなく、腹側よりも背側に位置する臀部の方が長く構成されている。従来のおむつは、吸収体よりも幅方向外側に延出するサイドフラップによって着用者の身体を覆うことを目的としているが、着用者の腹側に配置される前胴回り域と、着用者の背側に配置される後胴回り域と、が対称である。従来のおむつは、着用者の特徴を踏まえておらず、臀部を覆う部分が小さく、前後のサイドフラップ形状も前後対称の形とされている。この状態で伸縮部材を入れると収縮により臀部を覆う部位が小さくなりカバーしきれない。よって、従来のおむつは、身体のラインに沿って配置され難い。 The wearer's body is not symmetrical in front and back, and the buttocks located on the dorsal side is longer than the ventral side. Conventional diapers are intended to cover the wearer's body with side flaps that extend outward in the width direction from the absorbent body. However, the front waistline and the back of the wearer are arranged on the stomach side of the wearer. The rear waistline region arranged on the side is symmetrical. The conventional diaper is not based on the wearer's characteristics, the portion covering the buttocks is small, and the front and rear side flap shapes are also symmetrical. If an expansion / contraction member is inserted in this state, the part which covers a collar part by shrinkage will become small, and cannot be covered. Therefore, the conventional diaper is difficult to be disposed along the body line.
　また、オープンタイプのおむつを装着する際は、着用者の股下部の中心に脚回り開口部の幅方向中心が合うように着用者の下方に使い捨ておむつを配置し、後胴回り域によって臀部を包みつつ止着部材を前胴回り域側に引っ張り、止着部材によって着用者の腰回りにおむつを固定する。 When wearing an open diaper, place a disposable diaper below the wearer so that the center of the leg opening is aligned with the center of the crotch of the wearer, and wrap the buttocks around the rear waist area. While pulling the fastening member toward the front waistline, the diaper is fixed around the waist of the wearer by the fastening member.
　このように使い捨ておむつ装着した状態すると、着用者の臀部側に対応する後胴回り域が引っ張った状態となる。具体的には、臀部に接するサイドフラップの面積が足りず、サイドフラップが内向き（着用者の身体側）に凸状に配置され、サイドフラップが突っ張った状態となる。よって、後胴回り域が股下側にずれてしまったり、脚を上げ下げし難くなったりすることがある。 When the disposable diaper is attached in this manner, the rear waistline region corresponding to the wearer's buttocks side is pulled. Specifically, the area of the side flaps in contact with the buttocks is insufficient, the side flaps are arranged inwardly (in the wearer's body side) in a convex shape, and the side flaps are stretched. Therefore, the rear waistline region may be shifted to the crotch side, and it may be difficult to raise and lower the legs.
　また、サイドフラップが引っ張られた状態では、副弾性材が収縮し難くなり、副弾性材の収縮機能を十分に発揮することができない。 In addition, when the side flap is pulled, the secondary elastic material is difficult to contract, and the secondary elastic material cannot fully exhibit the contracting function.
　そこで、本発明は、上述の課題に鑑みてなされたものであり、脚回りのフィット性を維持しつつ、臀部を覆う後胴回り域のずれを抑制することができる使い捨ておむつを提供することを目的とする。 Then, this invention is made | formed in view of the above-mentioned subject, and it aims at providing the disposable diaper which can suppress the shift | offset | difference of the back waistline area which covers a hip part, maintaining the fit property of a leg periphery. And
　本開示に係る使い捨ておむつ（使い捨ておむつ10）は、前胴回り域と、後胴回り域と、前記前胴回り域と前記後胴回り域との間に位置する股下域とを有し、前記前胴回り域から前記後胴回り域に向かう製品長手方向と、前記製品長手方向と直交する製品幅方向と、を有し、前記股下域を跨ぎ、かつ前記前胴回り域と前記後胴回り域の少なくとも一方に延びる吸収体と、前記前胴回り域、前記股下域、及び前記後胴回り域を跨ぎ、かつ前記吸収体よりも前記製品幅方向外側に配置されるサイドフラップと、前記サイドフラップの前記後胴回り域から製品幅方向外側に延出し、前記前胴回り域に止着する一対のファスニングテープと、を備え、前記サイドフラップには、前記吸収体の前記製品幅方向における中心に向かって凹んだレッグ開口部と、前記レッグ開口部よりも製品幅方向内側に配置され、かつ前記製品長手方向に伸縮するレッグ伸縮部と、が形成されており、前記レッグ開口部は、前記レッグ開口部の前記製品長手方向中心よりも後方に位置する後側レッグ開口部と、前記レッグ開口部の前記製品長手方向中心よりも前方に位置する前側レッグ開口部とを有しており、前記後側レッグ開口部と、前記製品幅方向における中心を通り製品長手方向に平行な直線との間の面積は、前記前側レッグ開口部と、前記製品幅方向における中心を通り製品長手方向に平行な直線との間の面積よりも広く、前記レッグ伸縮部よりも前記製品幅方向外側には、前記股下域と前記後胴回り域とに跨って配置され、かつ前記製品長手方向に伸縮する臀部伸縮部が配置され、前記臀部伸縮部の伸長率は、前記レッグ伸縮部の伸長率よりも高いことを要旨とする。 A disposable diaper according to the present disclosure (disposable diaper 10) has a front waistline region, a rear waistline region, and a crotch region located between the front waistline region and the rear waistline region, and from the front waistline region An absorber having a product longitudinal direction toward the rear waistline and a product width direction orthogonal to the product longitudinal direction, straddling the crotch region and extending to at least one of the front waistline region and the rear waistline region A side flap that straddles the front waistline region, the crotch region, and the rear waistline region and that is disposed on the outer side in the product width direction than the absorber, and a product width direction from the rear waistline region of the side flap A pair of fastening tapes extending outward and fastened to the front waistline region, the side flaps having leg openings recessed toward the center in the product width direction of the absorber A leg stretchable part that is disposed on the inner side in the product width direction than the leg opening and extends and contracts in the product longitudinal direction, and the leg opening is the center in the product longitudinal direction of the leg opening. A rear leg opening located rearward of the product, and a front leg opening located forward of the product longitudinal center of the leg opening, the rear leg opening, and the product The area between the straight line passing through the center in the width direction and parallel to the product longitudinal direction is wider than the area between the front leg opening and the straight line passing through the center in the product width direction and parallel to the product longitudinal direction. Further, on the outer side in the product width direction with respect to the leg stretchable part, a collar stretchable part that is disposed across the crotch region and the rear waistline region and stretches in the product longitudinal direction is disposed, Elongation The gist is that the rate is higher than the elongation rate of the leg stretchable part.
図１は、本実施形態に係る使い捨ておむつの展開平面図である。FIG. 1 is a developed plan view of a disposable diaper according to the present embodiment. 図２は、図１に示したF1-F1線に沿った使い捨ておむつの断面図である。FIG. 2 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in FIG. 図３は、図１に示したF2-F2線に沿った使い捨ておむつの断面図である。FIG. 3 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in FIG. 図４は、本実施形態に係る使い捨ておむつを着用者に装着した状態を示す図である。FIG. 4 is a view showing a state in which the disposable diaper according to this embodiment is attached to the wearer.
　次に、本発明に係る使い捨ておむつ10の実施形態について、図面を参照しながら説明する。なお、以下の図面の記載において、同一または類似の部分には、同一または類似の符号を付している。ただし、図面は模式的なものであり、各寸法の比率などは現実のものとは異なることに留意すべきである。 Next, an embodiment of the disposable diaper 10 according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.
　したがって、具体的な寸法などは以下の説明を参酌して判断すべきである。また、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれ得る。 Therefore, specific dimensions should be determined in consideration of the following explanation. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.
　（１）使い捨ておむつの全体概略構成
　図１は、本実施形態に係る使い捨ておむつ10の展開平面図である。図２は、図１に示したF1-F1線に沿った使い捨ておむつの断面図である。図３は、図１に示したF2-F2線に沿った使い捨ておむつの断面図である。図１に示す展開平面図は、使い捨ておむつを構成するトップシート50、サイドフラップ70等の皺が形成されない状態まで、レッグ伸縮部75及びレッグサイドギャザー80の弾性部材81を伸長させた状態の図である。 (1) Overall Schematic Configuration of Disposable Diaper FIG. 1 is a developed plan view of a disposable diaper 10 according to this embodiment. FIG. 2 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in FIG. FIG. 3 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in FIG. The developed plan view shown in FIG. 1 shows a state in which the elastic members 81 of the leg stretchable part 75 and the leg side gathers 80 are stretched until the folds such as the top sheet 50 and the side flap 70 constituting the disposable diaper are not formed. It is.
　使い捨ておむつ10は、前胴回り域20と、股下域25と、後胴回り域30とを有する。前胴回り域20は、着用者の前胴回り部（腹部分）と接する部分である。また、後胴回り域30は、着用者の後胴回り部（背部分）と接する部分である。股下域25は、前胴回り域20と後胴回り域30との間に位置する。 The disposable diaper 10 has a front waistline region 20, a crotch region 25, and a back waistline region 30. The front waistline region 20 is a portion in contact with the wearer's front waistline portion (abdomen portion). Further, the rear waistline region 30 is a portion in contact with the rear waistline portion (back portion) of the wearer. The crotch region 25 is located between the front waistline region 20 and the back waistline region 30.
　なお、本実施形態では、前胴回り域20から後胴回り域30に向かう方向を製品長手方向Lと呼び、製品長手方向Lと直交する方向を製品幅方向Wと呼ぶ。 In this embodiment, the direction from the front waistline region 20 to the rear waistline region 30 is referred to as a product longitudinal direction L, and a direction orthogonal to the product longitudinal direction L is referred to as a product width direction W.
　使い捨ておむつ10は、股下域25を跨ぎ、かつ股下域25から前胴回り域20及び後胴回り域30のうち少なくともいずれか一方に向かって延びる吸収体40を備える。吸収体40は、吸収性コア40aとコアラップ40bとによって構成される。 The disposable diaper 10 includes an absorbent body 40 that straddles the crotch region 25 and extends from the crotch region 25 toward at least one of the front waistline region 20 and the rear waistline region 30. The absorber 40 includes an absorbent core 40a and a core wrap 40b.
　吸収性コア40aは、従来の使い捨ておむつと同様の材料によって構成でき、粉砕パルプや高吸収ポリマーなど、公知の部材や材料を用いて適宜構成することができる。吸収性コア40aは、シート状のコアラップ40bによって包まれている。 The absorbent core 40a can be made of the same material as that of a conventional disposable diaper, and can be appropriately formed using a known member or material such as pulverized pulp or a superabsorbent polymer. The absorbent core 40a is wrapped with a sheet-like core wrap 40b.
　コアラップ40bは、吸収性コア40aを被覆するシートである。コアラップ40bの少なくとも肌面側の一部は、透液性を有する各種の繊維不織布もしくはティッシュシートによって構成される。例えば、質量約10～30g/m2のエアースルー繊維不織布、スパンボンド不織布、SMS（スパンボンド－メルトブローン－スパンボンド）不織布、または質量約10～30g/m2のティッシュシートを用いることができる。 The core wrap 40b is a sheet that covers the absorbent core 40a. At least a part on the skin surface side of the core wrap 40b is constituted by various fiber nonwoven fabrics or tissue sheets having liquid permeability. For example, air-through nonwoven fabric of weight approximately 10 ~ 30g / m 2, spun bond nonwoven fabric, SMS can be used (spunbond - spunbond - meltblown) nonwoven or tissue sheet of the mass about 10 ~ 30g / m 2,.
　吸収体40の表面側（肌当接面側）には、液透過性のトップシート50が備えられる。また、吸収体40の裏面側（非肌当接面側）には、液不透過性のバックシート60aが備えられる。バックシート60aの裏面側（非肌当接面側）には、外装シート60が設けられる。 A liquid-permeable top sheet 50 is provided on the surface side (skin contact surface side) of the absorber 40. A liquid-impermeable back sheet 60a is provided on the back side (non-skin contact surface side) of the absorber 40. An exterior sheet 60 is provided on the back surface side (non-skin contact surface side) of the back sheet 60a.
　吸収体40の製品幅方向Wにおける側縁部には、サイドフラップ70がそれぞれ備えられる。サイドフラップ70は、前胴回り域20、股下域25、及び後胴回り域30を跨ぎ、かつ吸収体40よりも製品幅方向外側に配置される。サイドフラップ70は、１枚または２枚以上の複数枚重ねた不織布によって構成されている。 Side flaps 70 are respectively provided on side edges of the absorbent body 40 in the product width direction W. The side flap 70 straddles the front waistline region 20, the crotch region 25, and the rear waistline region 30, and is disposed outside the absorbent body 40 in the product width direction. The side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets.
　使い捨ておむつ10のサイドフラップ70には、一対のレッグ開口部35が形成される。レッグ開口部35は、使い捨ておむつの製品幅方向の側端部に設けられており、使い捨ておむつが着用者に着用された状態で、着用者の脚回りに沿って配置される部分である。レッグ開口部35は、吸収性本体の製品幅方向における中心に向かって凹んでいる。 A pair of leg openings 35 are formed in the side flap 70 of the disposable diaper 10. The leg opening 35 is provided at a side end portion in the product width direction of the disposable diaper, and is a portion that is disposed around the leg of the wearer while the disposable diaper is worn by the wearer. The leg opening 35 is recessed toward the center of the absorbent main body in the product width direction.
　レッグ開口部３５は、レッグ開口部３５の製品長手方向中心Ｏ４よりも後方に位置する後側レッグ開口部３５Ｒと、レッグ開口部３５の製品長手方向中心Ｏ４よりも前方に位置する前側レッグ開口部３５Ｆとを有する。後側レッグ開口部３５Ｒと、製品幅方向における中心を通り製品長手方向に平行な直線Ｌ１との間の面積は、前側レッグ開口部３５Ｆと、製品幅方向における中心を通り製品長手方向に平行な直線との間の面積よりも広い。当該面積は、使い捨ておむつを構成するトップシート50、サイドフラップ70等の皺が目視にて視認できない状態まで、レッグ伸縮部75及びレッグサイドギャザー80の弾性部材81を伸長させた伸長状態の面積である。 The leg opening 35 includes a rear leg opening 35R positioned rearward of the product longitudinal center O4 of the leg opening 35 and a front leg opening positioned forward of the product longitudinal center O4 of the leg opening 35. 35F. The area between the rear leg opening 35R and the straight line L1 passing through the center in the product width direction and parallel to the product longitudinal direction is parallel to the product leg direction through the front leg opening 35F and the center in the product width direction. It is wider than the area between the straight lines. The area is the area of the stretched state in which the elastic members 81 of the leg stretchable part 75 and the leg side gathers 80 are stretched until the wrinkles such as the top sheet 50 and the side flap 70 constituting the disposable diaper are not visually observable. is there.
　また、一対のサイドフラップ70には、ファスニングテープ90がそれぞれ備えられる。ファスニングテープ90は、後胴回り域30において、製品幅方向Wに沿って延び、前胴回り域20の非肌当接面に止着されることにより、使い捨ておむつ10を着用者の身体に保持する。 The pair of side flaps 70 are each provided with a fastening tape 90. The fastening tape 90 extends along the product width direction W in the rear waistline region 30, and is fastened to the non-skin contact surface of the front waistline region 20, thereby holding the disposable diaper 10 on the wearer's body.
　ターゲット部95は、前胴回り域内の非肌当接面に配置され、一対のファスニングテープ90がそれぞれ止着するように構成されている。 The target portion 95 is disposed on the non-skin contact surface in the front waistline region, and is configured such that the pair of fastening tapes 90 are fixed to each other.
　本実施形態において、前胴回り域20、後胴回り域30、及びファスニングテープ90によって胴回り保持部が構成される。後胴回り域30の胴回り保持部は、ファスニングテープ90の係合部分が設けられた領域から製品幅方向に延びる範囲である。前胴回り域20の胴回り保持部は、ターゲット部95が設けられた領域から製品幅方向に延びる範囲である。 In the present embodiment, the front waistline region 20, the rear waistline region 30, and the fastening tape 90 constitute a waistline holding portion. The waistline holding portion of the rear waistline region 30 is a range extending in the product width direction from the region where the engaging portion of the fastening tape 90 is provided. The waistline holding portion of the front waistline region 20 is a range extending in the product width direction from the region where the target portion 95 is provided.
　また、使い捨ておむつ10は、股下域25の吸収体に重なる領域に配置されたクロッチ伸縮部200を備えている。なお、クロッチ伸縮部200の構成については、後述にて詳細に説明する。 In addition, the disposable diaper 10 includes a crotch expansion / contraction part 200 disposed in a region overlapping the absorber in the crotch region 25. The configuration of the crotch expansion / contraction unit 200 will be described in detail later.
　サイドフラップ70には、レッグ開口部35よりも製品幅方向内側に配置され、製品長手方向Lに伸縮可能な一対のレッグ伸縮部75が備えられる。 The side flap 70 is provided with a pair of leg stretchable parts 75 that are arranged on the inner side in the product width direction than the leg opening 35 and can be stretched in the product longitudinal direction L.
　レッグ伸縮部75は、製品長手方向Ｌにおいて、クロッチ伸縮部200よりも長いと共に、製品幅方向Ｗにおいて、クロッチ伸縮部200よりも外側に備えられている。 The leg stretchable part 75 is longer than the crotch stretchable part 200 in the product longitudinal direction L and is provided outside the crotch stretchable part 200 in the product width direction W.
　レッグ伸縮部75は、レッグ開口部35を製品長手方向に伸縮できるように構成されていればよく、レッグ開口部35に沿って配置されていてもよいし、一部がレッグ開口部35に対して傾斜した状態で配置されていてもよい。 The leg expansion / contraction part 75 should just be comprised so that the leg opening part 35 can be expanded-contracted in a product longitudinal direction, may be arrange | positioned along the leg opening part 35, and one part is with respect to the leg opening part 35. And may be arranged in an inclined state.
　また、レッグ伸縮部75よりも製品幅方向外側には、股下域25と後胴回り域30とに跨って配置され、かつ製品長手方向に伸縮する臀部伸縮部77が配置されている。 Further, on the outer side in the product width direction than the leg stretchable part 75, a buttock stretchable part 77 that is disposed across the crotch region 25 and the rear waistline region 30 and stretches in the product longitudinal direction is disposed.
　なお、レッグ伸縮部75及び臀部伸縮部77は、糸ゴム等によって実質的に製品長手方向に収縮する部分であり、収縮力が発揮されない状態で伸縮性シートが配置された部分を除く概念である。なお、レッグ伸縮部75及び臀部伸縮部77の構成については、後述にて詳細に説明する。 The leg stretchable portion 75 and the heel stretchable portion 77 are portions that contract substantially in the longitudinal direction of the product with thread rubber or the like, and are a concept that excludes the portion where the stretchable sheet is disposed in a state where the contraction force is not exerted. . The configuration of the leg stretchable part 75 and the heel stretchable part 77 will be described in detail later.
　また、一対のレッグ伸縮部75の内側（製品幅方向Wにおける中央寄り）には、製品長手方向Lに沿って延びる一対のレッグサイドギャザー80が備えられる。レッグサイドギャザー80は、サイドフラップ70の製品幅方向の内側端部に設けられており、レッグ伸縮部75よりも製品幅方向内側に配置される起立性の伸縮ギャザーである。レッグサイドギャザー80は、レッグ伸縮部75よりも製品幅方向内側に配置されている。レッグサイドギャザー80は、従来において周知の構成を採用することができ、具体的には、サイドフラップ70と別のシート材によって構成されていてもよい。 Also, a pair of leg side gathers 80 extending along the product longitudinal direction L are provided inside the pair of leg stretchable portions 75 (near the center in the product width direction W). The leg side gathers 80 are provided at the inner end of the side flap 70 in the product width direction, and are erecting and expanding gathers disposed on the inner side in the product width direction than the leg stretchable parts 75. The leg side gathers 80 are arranged on the inner side in the product width direction than the leg stretchable parts 75. The leg side gathers 80 can adopt a conventionally well-known configuration. Specifically, the leg side gathers 80 may be formed of a sheet material different from the side flaps 70.
　また、製品幅方向における一対のファスニングテープ間には、製品幅方向に伸縮可能な腰回り伸縮部85が設けられている。腰回り伸縮部85は、ファスニングテープ間を製品幅方向に収縮する。 Also, between the pair of fastening tapes in the product width direction, a waist stretchable portion 85 that can be stretched in the product width direction is provided. The waist elastic part 85 contracts between the fastening tapes in the product width direction.
　本実施形態において、腰回り伸縮部85は、伸縮性シートによって構成されている。腰回り伸縮部85を構成する部材については、特に限定されないが、出来る限り薄くて曲げ剛性が低く、幅入り率が小さいものを用いることが好ましい。曲げ剛性が低い材料によって腰回り伸縮部８５を構成することにより、腰回り伸縮部８５が身体に沿って曲がりやすくなり、着用者の身体に負荷をかけずに腰回り伸縮部８５を身体に沿わせてフィットさせることができる。また、幅入り率が小さい材料によって腰回り伸縮部８５を構成することにより、使い捨ておむつが製品幅方向に伸長した場合における使い捨ておむつの製品長手方向の収縮を抑制し、着用者の腰回りにおいて使い捨ておむつが股下側に引き下がることを抑制できる。 In the present embodiment, the waist elastic part 85 is constituted by an elastic sheet. The members constituting the waist elastic part 85 are not particularly limited, but it is preferable to use a member that is as thin as possible, has low bending rigidity, and has a small width ratio. By configuring the waist stretchable portion 85 with a material having low bending rigidity, the waist stretchable portion 85 can easily bend along the body, and the waist stretchable portion 85 is placed along the body without applying a load to the wearer's body. Can be fitted. In addition, by configuring the waist stretchable portion 85 with a material having a small width ratio, it is possible to suppress contraction in the product longitudinal direction of the disposable diaper when the disposable diaper extends in the product width direction, and to dispose the disposable diaper around the wearer's waist It is possible to suppress the diaper from being pulled down to the crotch side.
　本実施形態では、腰回り伸縮部85として、目付けが20～45ｇ/ｍ２の伸縮性フィルムを用いた。 In this embodiment, a stretchable film having a basis weight of 20 to 45 g / m 2 is used as the waist stretchable portion 85.
　腰回り伸縮部85は、非伸長状態（自然状態）における長さの１.５～２.５倍に引き延ばされた後、ホットメルト接着剤又は加熱処理等によって外装シート60に接着される。 The waist stretchable portion 85 is stretched by 1.5 to 2.5 times the length in the non-stretched state (natural state) and then adhered to the exterior sheet 60 by a hot melt adhesive or heat treatment. .
　本実施形態では、腰回り伸縮部85は、外装シート60とバックシート60aとの間に配置されている。しかし、コアラップ40bが吸収性コア40aよりも製品長手方向外側に延出する構成にあっては、腰回り伸縮部85は、コアラップ40bと、バックシート60a又は外装シート60と、の間に配置されていてもよい。腰回り伸縮部の位置は、特に限定されない。また、吸収体が配置されない領域にあっては、サイドフラップ70と、バックシート60a又は外装シート60と、の間に配置されていてもよい。 In the present embodiment, the waist elastic part 85 is disposed between the exterior sheet 60 and the back sheet 60a. However, in the configuration in which the core wrap 40b extends outward in the product longitudinal direction from the absorbent core 40a, the waist stretchable portion 85 is disposed between the core wrap 40b and the back sheet 60a or the exterior sheet 60. It may be. The position of the waist elastic part is not particularly limited. Further, in a region where the absorbent body is not disposed, it may be disposed between the side flap 70 and the back sheet 60a or the exterior sheet 60.
　なお、本実施形態に係る腰回り伸縮部は、製品幅方向に伸縮するように構成されているが、腰回り伸縮部が製品幅方向と製品長手方向に伸縮するように構成されていてもよい。 In addition, although the waist stretchable part according to the present embodiment is configured to stretch in the product width direction, the waist stretchable part may be configured to stretch in the product width direction and the product longitudinal direction. .
　ファスニングテープ90は、後胴回り域30に対応するサイドフラップ70の領域に取り付けられている。ファスニングテープ90は、サイドフラップ70に連結された基材シート91と、複数の係合部材としての係合フック（図示せず）が設けられ、基材シート91に固定されたフックシート92と、を備える。フックシート92は、係合部材が設けられた領域であり、上述の胴回り保持部は、フックシート92から製品幅方向に延びる領域である。 Fastening tape 90 is attached to the region of the side flap 70 corresponding to the rear waistline region 30. The fastening tape 90 is provided with a base sheet 91 connected to the side flap 70, an engagement hook (not shown) as a plurality of engagement members, and a hook sheet 92 fixed to the base sheet 91; Is provided. The hook sheet 92 is an area where an engagement member is provided, and the above-described waistline holding portion is an area extending from the hook sheet 92 in the product width direction.
　フックシート92は、基材シート91に固定、具体的には接合されている。フックシート92と基材シート91との接合は、ファスニングテープ90の剛性が必要以上に高くなることがないようされていることが好ましい。具体的には、フックシート92と基材シート91とは、点状、線状或いはスパイラル状のような間欠的に塗布されたホットメルト接着剤によって接合されていることが好ましい。なお、フックシート92と基材シート91とは、熱シールなどで接合されてもよい。 The hook sheet 92 is fixed to the base sheet 91, specifically, bonded. The hook sheet 92 and the base sheet 91 are preferably joined so that the rigidity of the fastening tape 90 does not become higher than necessary. Specifically, it is preferable that the hook sheet 92 and the base sheet 91 are joined by a hot melt adhesive applied intermittently such as a dot shape, a line shape, or a spiral shape. The hook sheet 92 and the base sheet 91 may be joined by heat sealing or the like.
　基材シート91は、１枚または２枚以上の複数枚重ねた不織布によって構成されている。基材シート91としては、スパンボンド（SB）またはスパンボンド－メルトブローン－スパンボンド（SMS）などの製法によって製造された不織布を用いることができる。基材シート91を構成する不織布の目付け（複数枚の場合は合計目付け）は、30～120g/m2であり、好ましくは40～90g/m2である。 The base sheet 91 is composed of one or two or more non-woven fabrics stacked. As the base material sheet 91, a nonwoven fabric manufactured by a manufacturing method such as spunbond (SB) or spunbond-meltblown-spunbond (SMS) can be used. The basis weight of the nonwoven fabric constituting the base sheet 91 (the total basis weight in the case of a plurality of sheets) is 30 to 120 g / m 2 , preferably 40 to 90 g / m 2 .
　ターゲット部95は、前胴回り域の外装シート60の非肌当接側の面に設けられている。ターゲット部95は、ファスニングテープの係合フックが引っ掛かるように構成されており、フックとループの係止システムのループとして機能する。ターゲット部としては、例えば、エアースルー不織布を用いることができる。 The target portion 95 is provided on the non-skin contact side surface of the exterior sheet 60 in the front waistline region. The target portion 95 is configured so that the engaging hook of the fastening tape is hooked, and functions as a loop of a hook and loop locking system. As the target portion, for example, an air-through nonwoven fabric can be used.
　ターゲット部95は、例えばポリオレフィン系の熱可塑性合成樹脂繊維から作られた繊維不織布またはポリオレフィン系の熱可塑性合成樹脂フィルムを用いることができる。また、ターゲット部に取り付けられたループは、ポリオレフィン系の熱可塑性合成樹脂によって形成できる。 For the target portion 95, for example, a fiber nonwoven fabric made of a polyolefin-based thermoplastic synthetic resin fiber or a polyolefin-based thermoplastic synthetic resin film can be used. Further, the loop attached to the target portion can be formed of a polyolefin-based thermoplastic synthetic resin.
　更に、ターゲット部95として、嵩高の不織布であって、その一部をエンボスすることで不織布表面の毛羽立ちを防止した不織布を用いてもよい。 Furthermore, as the target portion 95, a non-woven fabric which is a bulky non-woven fabric and which is partly embossed to prevent fluffing on the non-woven fabric surface may be used.
　また、使い捨ておむつの外装シート60を不織布によって形成し、ファスニングテープ90の取り付け位置を示す図柄をバックシート60a又は外装シート60の非肌当接側の面に印刷する、若しくは図柄のシートをバックシート60a又は外装シート60の非肌当接側に配置することによってもターゲット部とすることができる。 Further, the exterior sheet 60 of the disposable diaper is formed of non-woven fabric, and the design indicating the attachment position of the fastening tape 90 is printed on the back sheet 60a or the non-skin contact side surface of the exterior sheet 60, or the design sheet is printed on the back sheet. It can also be set as the target portion by arranging it on the non-skin contact side of 60a or the exterior sheet 60.
　また、後側レッグ開口部と、製品幅方向における中心を通り製品長手方向に平行な直線L1との間の面積は、前側レッグ開口部と、製品幅方向における中心を通り製品長手方向に平行な直線L1との間の面積よりも広い。よって、レッグ開口部の製品長手方向中心よりも後側に位置するサイドフラップは、レッグ開口部の製品長手方向中心よりも前側に位置するサイドフラップよりも製品幅方向外側に延出しており、身体を覆うことができる面積が広い。 Further, the area between the rear leg opening and the straight line L1 passing through the center in the product width direction and parallel to the product longitudinal direction is parallel to the product longitudinal direction through the front leg opening and the center in the product width direction. It is wider than the area between the straight line L1. Therefore, the side flap located behind the product longitudinal center of the leg opening extends outward in the product width direction from the side flap located forward of the product longitudinal center of the leg opening, The area that can be covered is wide.
　なお、製品幅方向における中心を通り製品長手方向に平行な直線L1とは、使い捨ておむつの製品幅方向における中心を通り、かつ製品長手方向に平行な直線である。 The straight line L1 passing through the center in the product width direction and parallel to the product longitudinal direction is a straight line passing through the center in the product width direction of the disposable diaper and parallel to the product longitudinal direction.
　着用者の身体は、前後対称ではなく、腹側の表面積よりも背側の表面積の方が広い。着用者の背側には、外側に膨らむ臀部が存在するためである。また、着用者が使い捨ておむつを着用した状態では、レッグ開口部の製品長手方向の中心Ｏ４が、着用者の股下の製品長手方向の中心に対応する位置となり易い。例えば、レッグ開口部の製品長手方向中心よりも後方に位置する後側レッグ開口部と製品幅方向における中心を通り製品長手方向に平行な直線との間の面積が、レッグ開口部の製品長手方向中心よりも前方に位置する前側レッグ開口部と製品幅方向における中心を通り製品長手方向に平行な直線との間の面積と同じ面積、又は後側レッグ開口部と製品幅方向における中心を通り製品長手方向に平行な直線との間の面積が、前側レッグ開口部と製品幅方向における中心を通り製品長手方向に平行な直線との間の面積よりも少ないと、前後非対称である身体を覆うように使い捨ておむつを配置できず、着用者の背側において突っ張った状態となったり、着用者の腹側においてよれた状態となったりする。 The wearer's body is not symmetric in the front-rear direction and has a larger surface area on the back side than on the abdominal side. This is because there is a butt that bulges outward on the back side of the wearer. Moreover, in the state in which the wearer wears the disposable diaper, the product longitudinal center O4 of the leg opening is likely to be a position corresponding to the product longitudinal center of the wearer's crotch. For example, the area between the rear leg opening located behind the product longitudinal center of the leg opening and the straight line passing through the center in the product width direction and parallel to the product longitudinal direction is the product longitudinal direction of the leg opening. The same area as the area between the front leg opening located in front of the center and a straight line passing through the center in the product width direction and parallel to the product longitudinal direction, or the product passing through the rear leg opening and the center in the product width direction. If the area between the straight line parallel to the longitudinal direction is less than the area between the front leg opening and the straight line passing through the center in the product width direction and parallel to the product longitudinal direction, the body that is asymmetrical in the longitudinal direction is covered. Disposable diapers cannot be placed on the back of the wearer, and the diaper is stretched on the back side of the wearer, or on the abdomen of the wearer.
　着用者の背側においてサイドフラップ７０が突っ張った状態となると、装着された状態で後胴回り域側のレッグ開口部35が製品幅方向内側に向かってめくれあがり、着用者の臀部が露出してしまうことがある。また、後胴回り域側のサイドフラップに臀部を覆うことができる十分な面積がないために、装着時に後胴回り域の製品幅方向端部が内側に巻き込まれ、着用者の臀部が露出してしまったり、後胴回り域が股下側にずれてしまったり、脚を上げ下げし難くなったりすることがある。 When the side flaps 70 are stretched on the back side of the wearer, the leg opening 35 on the side of the rear waist region is turned up toward the inner side in the product width direction while being worn, and the buttocks of the wearer are exposed. Sometimes. In addition, since there is not enough area to cover the buttocks on the side flaps on the back waistline side, the product width direction end of the back waistline is caught inside when wearing, and the wearer's buttocks are exposed. The back waistline may shift to the crotch side, and it may be difficult to raise and lower the legs.
　しかし、レッグ開口部の製品長手方向中心よりも後側に位置するサイドフラップは、レッグ開口部の製品長手方向中心よりも前側に位置するサイドフラップよりも幅方向外側に延出しているため、前後非対称である身体を覆うように使い捨ておむつを配置でき、着用者の身体に対応して使い捨ておむつを配置することができる。 However, the side flaps located on the rear side of the product longitudinal center of the leg opening extend outward in the width direction than the side flaps located on the front side of the product longitudinal center of the leg opening. A disposable diaper can be arrange | positioned so that the body which is asymmetrical may be covered, and a disposable diaper can be arrange | positioned corresponding to a wearer's body.
　更に、使い捨ておむつのレッグ開口部３５の前胴回り域側の部分は、着用者のそけい部の近傍に配される。よって、一方、使い捨ておむつのレッグ開口部３５の後胴回り域側の部分は、着用者の臀部の徐々に膨らむ部分に配される。前胴回り域側のサイドフラップの幅を狭くし、後胴回り域側のサイドフラップの幅を広く確保することで、そけい部に沿ってサイドフラップを配置しつつ、臀部の膨らみに沿ってサイドフラップを配置することができる。 Further, the front waistline side portion of the leg opening 35 of the disposable diaper is arranged in the vicinity of the wearer's ridge. Therefore, on the other hand, the part of the leg opening part 35 of the disposable diaper on the rear waistline region side is arranged on the gradually inflating part of the wearer's buttocks. By narrowing the width of the side flaps on the front waistline side and widening the width of the side flaps on the rear waistline side, the side flaps are arranged along the ridges while the side flaps are arranged along the ridges. Can be arranged.
　更に、このように身体のラインに沿ってサイドフラップを配置して、臀部の最も膨らんだ部分を覆うようにサイドフラップを配することにより、着用者の脚の動きがより加わった場合であっても、臀部側のサイドフラップが臀部の最も膨らんだ部分を越えて幅方向内側にたくれることを防止し、臀部が露出することを防止できる。 Further, by arranging the side flaps along the body line in this way and arranging the side flaps so as to cover the most swollen part of the buttocks, the movement of the wearer's legs is further added. However, it is possible to prevent the side flap on the buttock side from striking inward in the width direction beyond the most swollen portion of the buttock, and to prevent the buttock from being exposed.
　後側レッグ開口部３５Ｒには、製品幅方向外側に向けて凸状となる凸部36が複数形成されている。凸部36は、レッグ開口部の前後の領域よりも製品幅方向外側に突出した部分である。レッグ開口部３５は、着用者の脚繰りに当たる箇所であり、使い捨ておむつ１０の内側に向かって入り込み易い部分である。従って、より広くレッグ開口部３５が身体を覆うことが好ましく、特に、後側レッグ開口部３５Ｒが身体を広く覆うように配置されることが望ましい。凸部３６を設けることにより、後側レッグ開口部３５Ｒ部分の面積を大きくして、かつその形状を外向きに凸形状とすることにより、広く臀部を覆うことができる。 A plurality of convex portions 36 that are convex outward in the product width direction are formed in the rear leg opening 35R. The convex portion 36 is a portion protruding outward in the product width direction from the region before and after the leg opening. The leg opening 35 is a portion that hits the wearer's leg and is a portion that easily enters the inside of the disposable diaper 10. Therefore, it is preferable that the leg opening 35 covers the body more widely, and it is particularly desirable that the rear leg opening 35R be disposed so as to cover the body widely. By providing the convex portion 36, the area of the rear leg opening portion 35R can be increased, and the shape of the convex portion can be widened to cover the collar portion widely.
　更に、後側レッグ開口部３５Ｒ、特に、後側レッグ開口部３５Ｒの後部には、応力が集中し易いため、凸部36を形成することによって、肌への圧力をより分散できる状態としておくことが好ましい。具体的には、ファスニングテープ90の基端に近い位置では、応力が集中し易く、また使い捨ておむつ10の着用時には前後で重なり合うこともある部位であるため、肌への圧力を分散できるように凸状とすることが好ましい。 Furthermore, since stress tends to concentrate on the rear leg opening 35R, in particular, the rear part of the rear leg opening 35R, the convex 36 is formed so that the pressure on the skin can be more dispersed. Is preferred. Specifically, stress is likely to concentrate near the base end of the fastening tape 90, and it may overlap in the front and back when the disposable diaper 10 is worn, so that the pressure on the skin can be dispersed. It is preferred that
　前側レッグ開口部３５Ｆには、製品幅方向内側に向けて凹む形状となる凹部が形成されている。凹部37は、レッグ開口部の前後の領域よりも製品幅方向内側に凹んで部分である。凹部37は、凹状であるため、着用者のそけい部に沿い易い。このため、サイドフラップ70及びレッグ伸縮部75が着用者によりフィットし、使い捨ておむつ10の前胴回り域20から股下域25を、着用者の動きに関わらず安定して身体に沿わせられる。例えば、着用者の脚の動きにより吸収体40の幅を狭くするような動きがなされた場合でも、凹部37がそけい部にフィットし続け、吸収体40の幅が狭まることなく広い状態を維持できる。凸部36及び凹部37は、肌への圧力緩和に加えて、着用者の身体に沿うことも必要である。 In the front leg opening 35F, a recess is formed that is recessed toward the inside in the product width direction. The recessed portion 37 is a portion that is recessed inward in the product width direction from the front and back regions of the leg opening. Since the concave portion 37 is concave, it is easy to follow the wearer's ridge portion. For this reason, the side flap 70 and the leg expansion / contraction part 75 fit by a wearer, and the crotch region 25 from the front waistline area 20 of the disposable diaper 10 can be made to follow a body stably irrespective of a wearer's movement. For example, even when the movement of the wearer's leg narrows the width of the absorbent body 40, the concave portion 37 continues to fit into the ridge and maintains the wide state without the width of the absorbent body 40 narrowing. it can. The convex part 36 and the concave part 37 need to be along the wearer's body in addition to the pressure relief on the skin.
（２）レッグ伸縮部及び臀部伸縮部の構成
　レッグ伸縮部75は、吸収体40よりも製品幅方向外側において製品長手方向Lに沿って配置され、製品長手方向Lに伸縮可能に構成されている。 (2) Structure of leg stretchable part and heel stretchable part The leg stretchable part 75 is arranged along the product longitudinal direction L outside the absorbent body 40 in the product width direction and is configured to be stretchable in the product longitudinal direction L. .
　レッグ伸縮部75は、サイドフラップ70と外装シート60との間に配置されている。或いは、吸収体40と外装シート60との間に配置されるバックシート60aが備えられる領域では、レッグ伸縮部75は、バックシート60aとサイドフラップ70との間に配置されている。 The leg elastic part 75 is disposed between the side flap 70 and the exterior sheet 60. Alternatively, in a region where the back sheet 60a disposed between the absorber 40 and the exterior sheet 60 is provided, the leg stretchable part 75 is disposed between the back sheet 60a and the side flap 70.
　レッグ伸縮部75は、所定本数の弾性部材（図１の例では、２本の弾性部材）によって構成されている。本実施形態に係る弾性部材は、ポリウレタン弾性繊維や天然ゴムからなる。臀部伸縮部77は、所定本数の弾性部材（図１の例では、１本の弾性部材）によって構成されている。本実施形態に係る弾性部材は、ポリウレタン弾性繊維や天然ゴムからなる。 The leg stretchable part 75 is configured by a predetermined number of elastic members (in the example of FIG. 1, two elastic members). The elastic member according to the present embodiment is made of polyurethane elastic fiber or natural rubber. The collar expansion / contraction part 77 is configured by a predetermined number of elastic members (in the example of FIG. 1, one elastic member). The elastic member according to the present embodiment is made of polyurethane elastic fiber or natural rubber.
　また、本実施の形態の臀部伸縮部77を構成する弾性部材は、製品長手方向に沿って配置された糸ゴムである。よって、サイドフラップ70の臀部伸縮部が設けられた領域全体を均等に収縮させてふくらみのある着用者の臀部にサイドフラップ７０が沿うことができるので、当該領域がめくれることなく臀部を覆うことができる。 Further, the elastic member that constitutes the collar expansion / contraction part 77 of the present embodiment is a thread rubber arranged along the product longitudinal direction. Accordingly, the entire region of the side flap 70 where the heel expansion / contraction portion is provided can be evenly contracted so that the side flap 70 can follow the heel of the swelled wearer, so that the region can be covered without turning over the region. it can.
　臀部伸縮部77は、サイドフラップ70と外装シート60との間に配置されている。或いは、吸収体40と外装シート60との間に配置されるバックシート60aが備えられる領域では、臀部伸縮部77は、バックシート60aとサイドフラップ70との間に配置されている。 The hip expansion / contraction section 77 is disposed between the side flap 70 and the exterior sheet 60. Alternatively, in the region where the back sheet 60a disposed between the absorber 40 and the exterior sheet 60 is provided, the collar expansion / contraction part 77 is disposed between the back sheet 60a and the side flap 70.
　レッグ伸縮部75の製品長手方向の中心Ｏ３は、使い捨ておむつの伸長状態において、使い捨ておむつの製品長手方向の中心Ｏ１よりも前方に位置する。また、使い捨ておむつの伸長状態において、レッグ開口部35の製品長手方向の中心Ｏ４は、使い捨ておむつの製品長手方向の中心Ｏ１よりも前方に位置する。 The product longitudinal direction center O3 of the leg stretchable part 75 is located in front of the product longitudinal direction center O1 of the disposable diaper in the extended state of the disposable diaper. In the extended state of the disposable diaper, the product longitudinal center O4 of the leg opening 35 is located in front of the product longitudinal center O1 of the disposable diaper.
　このように、レッグ伸縮部75の製品長手方向の中心Ｏ３及びレッグ開口部35の製品長手方向の中心Ｏ４を使い捨ておむつの製品長手方向の中心Ｏ１よりも前方に配置することにより、レッグ伸縮部75の製品長手方向の中心Ｏ３及びレッグ開口部35の製品長手方向の中心Ｏ４を身体の製品長手方向中心に当てて使い捨ておむつを装着した状態で、後胴回り域30の製品長手方向Ｌの長さを前胴回り域20の製品長手方向Ｌの長さよりも長く設けることができる。 In this way, by arranging the product longitudinal center O3 of the leg stretchable part 75 and the product longitudinal center O4 of the leg opening 35 in front of the product longitudinal center O1 of the disposable diaper, the leg stretchable part 75 is disposed. In the state where the disposable diaper is mounted with the product longitudinal center O3 and the product longitudinal center O4 of the leg opening 35 being applied to the product longitudinal center of the body, the length in the product longitudinal direction L of the rear waistline region 30 is set. The front waistline region 20 can be provided longer than the length in the product longitudinal direction L.
　上述のように、着用者の身体は、前後対称ではなく、腹側よりも背側の方が長く構成されている。例えば、後胴回り域30の製品長手方向Ｌの長さと、前胴回り域20の製品長手方向Ｌの長さと、が同じであると、前後非対称である身体のラインに沿って使い捨ておむつが配置されない。 As described above, the wearer's body is not symmetrical in the front-rear direction, and the back side is longer than the ventral side. For example, if the length in the product longitudinal direction L of the rear waistline region 30 and the length in the product longitudinal direction L of the front waistline region 20 are the same, the disposable diaper is not disposed along the body line that is asymmetrical in the front-rear direction.
　特に、着用者の動きが生じた場合（特に、寝姿勢にて足を上げたり、立ったり、座ったりした際）には、着用者の身体の表面の皮膚の伸縮量（長さの変化量）は、腹側よりも背側（臀部）の方が大きくなる。よって、例えば、使い捨ておむつ10の自然状態の後胴回り域30の製品長手方向Ｌの長さと、使い捨ておむつ10の自然状態の前胴回り域20の製品長手方向Ｌの長さと、が同じであると、着用者の背側において突っ張った状態となる。 In particular, when the wearer's movement occurs (especially when the legs are raised, standing, or sitting in a sleeping position), the amount of skin expansion / contraction (the amount of change in length) on the surface of the wearer's body ) Is larger on the dorsal side (buttock) than on the ventral side. Thus, for example, the length of the product longitudinal direction L of the rear waistline region 30 of the disposable diaper 10 in the natural state is the same as the length of the product longitudinal direction L of the front waistline region 20 of the disposable diaper 10 in the natural state. It is in a state of being stretched on the back side of the wearer.
　しかし、本実施形態に係る使い捨ておむつによれば、使い捨ておむつ10の自然状態の後胴回り域30の製品長手方向Ｌの長さを、使い捨ておむつ10の自然状態の前胴回り域20の製品長手方向Ｌの長さよりも長くできるため、着用者の臀部回りを適切に覆うことができる。よって、着用者の動きがあった場合であっても、着用者の皮膚の動きに影響を受けて、使い捨ておむつ１０の前胴回り域20及び後胴回り域30が、製品長手方向Ｌに沿う向きに動いてしまうという事態を抑制することが可能となり、適切に臀部を覆うことができる。 However, according to the disposable diaper according to the present embodiment, the length in the product longitudinal direction L of the rear waist region 30 of the disposable diaper 10 in the natural state is set to the product longitudinal direction L of the front waist region 20 in the natural state of the disposable diaper 10. Therefore, the wearer's buttocks can be appropriately covered. Therefore, even if there is a movement of the wearer, the front waistline region 20 and the back waistline region 30 of the disposable diaper 10 are in a direction along the product longitudinal direction L due to the movement of the wearer's skin. It becomes possible to suppress the situation of moving and cover the buttocks appropriately.
　更に、レッグ伸縮部75の製品長手方向の中心Ｏ３及びレッグ開口部35の製品長手方向の中心Ｏ４を使い捨ておむつの製品長手方向の中心Ｏ１よりも前方に配置することにより、レッグ開口部を前寄り（腹側寄り）に形成できる。着用者の足は、体の前側寄りに向かって伸びている。ファスニングテープ90によって係合した状態において、レッグ開口部35が前寄りの位置となるため、着用者の体により適したおむつとなる。そのため、装着時に着用者が足をうごかし易くなり、後胴回り域も突っ張り難くできる。 Further, the product longitudinal center O3 of the leg stretchable part 75 and the product longitudinal center O4 of the leg opening 35 are arranged in front of the product longitudinal center O1 of the disposable diaper, thereby moving the leg opening forward. It can be formed (near the ventral side). The wearer's legs extend toward the front of the body. In the state engaged by the fastening tape 90, the leg opening 35 is in the front position, so that the diaper is more suitable for the wearer's body. Therefore, it becomes easy for the wearer to move his / her foot during wearing, and the rear waistline region can be made difficult to stick.
　また、臀部伸縮部77は、股下域25と後胴回り域30とに跨って配置されており、臀部伸縮部77の製品長手方向中心Ｏ５は、レッグ伸縮部75の製品長手方向の中心Ｏ３よりも後方に位置する。レッグ伸縮部75の後部かつ製品幅方向外側の領域が臀部伸縮部77によって収縮し、後胴回り域のレッグ開口部近傍（臀部の股下側の端部）を後方及び幅方向外側に引き上げることができる。図４は、使い捨ておむつを装着した状態を模式的に示した図である。 Further, the buttocks stretchable portion 77 is disposed across the crotch region 25 and the rear waistline region 30, and the product longitudinal center O5 of the buttocks stretchable portion 77 is more than the center O3 of the leg stretchable portion 75 in the product longitudinal direction. Located behind. The rear part of the leg elastic part 75 and the area outside the product width direction are contracted by the hip elastic part 77, and the vicinity of the leg opening part in the rear waistline region (the end part on the crotch side of the hip part) can be pulled up backward and in the width direction. . Drawing 4 is a figure showing typically the state where a disposable diaper was equipped.
　使い捨ておむつの自然状態において、臀部伸縮部77の伸長率は、レッグ伸縮部75の伸長率よりも高い。臀部伸縮部の伸長率がレッグ伸縮部の伸長率よりも高いため、おむつを臀部付近にたぐり寄せることができる。よって、着用者の臀部及び脚の後側の付け根に、使い捨ておむつを寄せ集めることができ、着用者が脚を上げ下げした際のつっぱりを抑制できる。 In the natural state of disposable diapers, the stretch rate of the buttocks stretchable part 77 is higher than the stretch rate of the leg stretchable part 75. Since the extension rate of the buttocks stretchable part is higher than the extension rate of the leg stretchable parts, the diaper can be brought near the buttocks. Therefore, a disposable diaper can be gathered and gathered to a wearer's buttocks and the base of the back of a leg, and the pulling when a wearer raises and lowers a leg can be controlled.
　また、臀部伸縮部77は、股下域２５と後胴回り域３０とに跨がって配置されており、使い捨ておむつの製品長手方向中央よりも後胴回り域よりに配置されている。一方、レッグ伸縮部75は、前胴回り域２０から後胴回り域３０に跨がって配置されており、ほぼ使い捨ておむつの製品長手方向中央に配置されている。 Moreover, the buttocks elastic part 77 is arrange | positioned ranging over the crotch area 25 and the back waist area 30, and is arrange | positioned from the back waist area rather than the product longitudinal direction center of a disposable diaper. On the other hand, the leg expansion / contraction part 75 is arrange | positioned ranging from the front waist area 20 to the back waist area 30, and is arrange | positioned substantially at the product longitudinal direction center of a disposable diaper.
　このように臀部伸縮部77とレッグ伸縮部75とが配置され、かつ臀部伸縮部の伸長率がレッグ伸縮部75の伸長率よりも高いため、レッグ伸縮部75と臀部伸縮部77との間に発生するしわは、製品幅方向中央から外側に向かい、かつ股下域から後胴回り域側に向かって延びる。よって、使い捨ておむつが装着された状態で、後胴回り域側のサイドフラップを幅方向外側に引っ張りつつ、腰回り開口部側に引き上げることができ、後胴回り域側のサイドフラップが幅方向内側に巻き込まれることを防ぐことができる。 In this way, the hip elastic part 77 and the leg elastic part 75 are arranged, and the extension rate of the hip elastic part is higher than the extension rate of the leg elastic part 75. The generated wrinkles extend outward from the center in the product width direction and extend from the crotch region toward the rear waistline region. Therefore, with the disposable diaper attached, the side flaps on the back waistline side can be pulled up to the waist opening side while pulling the side flaps on the outside in the width direction. Can be prevented.
　例えば、一般的に使い捨ておむつを装着する際は、使い捨ておむつの股下域を着用者の股下に当てた状態で、使い捨ておむつを製品長手方向に引っ張り、ファスニングテープ等で固定する。このように装着された状態では、ファスニングテープの止着力によってサイドフラップを引き上げていることがあり、ファスニングテープと脚回り開口部の製品長手方向中心とを繋ぐ直線状に使い捨ておむつが引っ張られ、着用者の臀部を覆うようにサイドフラップを配置できないおそれがある。 For example, generally when wearing disposable diapers, the disposable diaper is pulled in the longitudinal direction of the product with the crotch region of the disposable diaper applied to the wearer's crotch and fixed with fastening tape or the like. In such a state, the side flaps may be pulled up by the fastening force of the fastening tape, and the disposable diaper is pulled and worn in a straight line connecting the fastening tape and the product longitudinal center of the leg opening. There is a possibility that the side flaps cannot be arranged to cover the person's buttocks.
　しかし、臀部伸縮部77によって、後胴回り域側のサイドフラップを幅方向外側に引っ張りつつ、腰回り開口部側に引き上げることにより、ファスニングテープの止着力によらずに、サイドフラップを引き上げるため、意図しない変形を抑制できる。更に、サイドフラップを引き上げるためにファスニングテープを引き上げて止着する必要がなく、着用者の腰回りに対して緩やかに巻き付けることができ、装着感を向上させることができる。 However, by pulling the side flap on the rear waistline side to the outside in the width direction with the buttocks stretchable part 77 and pulling it up to the waist opening side, the side flap is pulled up regardless of the fastening force of the fastening tape. Deformation that does not occur can be suppressed. Furthermore, it is not necessary to pull up and fasten the fastening tape in order to pull up the side flaps, and it can be gently wound around the waist of the wearer, improving the wearing feeling.
　なお、使い捨ておむつの自然状態とは、使い捨ておむつ10を包装パッケージから取り出し、20℃±2℃、相対湿度60%±5%RHの雰囲気下において60分放置した後に測定した場合をいう。 In addition, the natural state of the disposable diaper means a case where the disposable diaper 10 is taken out of the package and measured after being left in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 60 minutes.
　更に、臀部伸縮部の前端部77Fは、レッグ開口部35の製品長手方向の中心よりも後方に位置する。よって、レッグ伸縮部の後部かつ製品幅方向外側の領域が臀部伸縮部77によって収縮し、後胴回り域のレッグ開口部近傍（臀部の股下側の端部）を後方に引き上げることができる。 Furthermore, the front end portion 77F of the buttocks expansion / contraction portion is located behind the center of the leg opening 35 in the product longitudinal direction. Therefore, the rear part of the leg stretchable part and the region on the outer side in the product width direction are contracted by the buttock stretchable part 77, so that the vicinity of the leg opening part (the end part on the crotch side of the buttock) can be pulled rearward.
　例えば、一般的に使い捨ておむつを装着する際は、使い捨ておむつの股下域を着用者の股下に当てた状態で、使い捨ておむつを前後方向に引っ張り、ファスニングテープ等で固定する。このように装着すると、ファスニングテープの止着部分と股下域との間で使い捨ておむつが引っ張られ、レッグ開口部35が着用者の脚回りに沿って配置されないことがある。 For example, when wearing disposable diapers, for example, the disposable diaper is pulled in the front-rear direction with the crotch area of the disposable diaper applied to the wearer's inseam and fixed with fastening tape or the like. When worn in this manner, the disposable diaper may be pulled between the fastening portion of the fastening tape and the crotch region, and the leg opening 35 may not be disposed around the wearer's leg.
　特に、臀部側は、着用者の腹側に比べて臀部の面積が大きいため、装着時に後胴回り域の製品幅方向端部が内側に巻き込まれ、臀部の一部が露出してしまうおそれがある。しかし、臀部伸縮部77によって後胴回り域30に使い捨ておむつを寄せることができ、着用者の臀部が露出してしまう不具合を抑制できる。 In particular, since the buttock side has a larger area of the buttock than the wearer's stomach side, the product width direction end of the rear waistline region may be caught inside when wearing, and a part of the buttock may be exposed. . However, the disposable diaper can be brought close to the rear waistline region 30 by the buttocks expansion / contraction part 77, and the problem that the wearer's buttocks are exposed can be suppressed.
　使い捨ておむつ10の伸長状態において、製品幅方向における臀部伸縮部77とレッグ伸縮部75との距離Ｄ１は、１０ｍｍ～３０ｍｍであることが望ましい。例えば、臀部伸縮部77とレッグ伸縮部75との距離が３０ｍｍより長いと、臀部伸縮部77とレッグ伸縮部75とが互いに独立して伸縮し、臀部伸縮部77とレッグ伸縮部75とが連動し難い。しかし、使い捨ておむつ10の伸長状態における製品幅方向における臀部伸縮部とレッグ伸縮部との距離が１０ｍｍ～３０ｍｍの場合には、臀部伸縮部77とレッグ伸縮部75が連動し易い。例えば、臀部伸縮部のみが独立して収縮すると、おむつを装着する際に収縮部分が内側に巻き込まれたり、倒れ込んだりすることが考えられる。しかし、臀部伸縮部とレッグ伸縮部が連動することにより、臀部伸縮部が内側に倒れ込むことを抑制できる。 In the extended state of the disposable diaper 10, the distance D1 between the buttocks stretchable part 77 and the leg stretchable part 75 in the product width direction is desirably 10 mm to 30 mm. For example, if the distance between the buttocks stretchable part 77 and the leg stretchable part 75 is longer than 30 mm, the buttocks stretchable part 77 and the leg stretchable part 75 stretch independently of each other, and the buttocks stretchable part 77 and the leg stretchable part 75 are interlocked. It is hard to do. However, when the distance between the heel stretchable portion and the leg stretchable portion in the product width direction in the extended state of the disposable diaper 10 is 10 mm to 30 mm, the heel stretchable portion 77 and the leg stretchable portion 75 are easily interlocked. For example, if only the buttocks stretchable part contracts independently, it is conceivable that when the diaper is worn, the contracted part is caught inside or falls down. However, it is possible to suppress the hip elastic part from falling inward by interlocking the hip elastic part and the leg elastic part.
　なお、本明細書における「長さ」の測定は、以下の測定方法によって行われるものとする。 Note that the “length” in this specification is measured by the following measurement method.
　使い捨ておむつ10がパッケージなどに封入されている場合には、パッケージから取り出し、その状態にて20℃±2℃、相対湿度60％±5％RHの雰囲気下において12時間放置したサンプルを用いる。 If the disposable diaper 10 is enclosed in a package or the like, use a sample that is removed from the package and left in that state for 12 hours in an atmosphere of 20 ° C. ± 2 ° C. and relative humidity 60% ± 5% RH.
　次いで、シンワ測定株式会社製のスプリングメジャー（テープ：ガラス繊維入塩ビ被覆）を用いて、測定対象部位に沿わせるようにして、使い捨ておむつ10のこの状態の長さ、つまり、使い捨ておむつ10の自然状態のレッグ伸縮部75の長さを測定する。また、伸長状態の長さは、使い捨ておむつ10を自然状態から弾性部材によるしわが目視にて確認できない状態まで延伸した時のレッグ伸縮部75の長さを測定する。 Next, the length of the disposable diaper 10 in this state, that is, the naturalness of the disposable diaper 10 is adjusted by using a spring measure manufactured by Shinwa Measurement Co., Ltd. The length of the leg extension 75 in the state is measured. The length of the stretched state is the length of the leg stretchable part 75 when the disposable diaper 10 is stretched from a natural state to a state where wrinkles due to the elastic member cannot be visually confirmed.
　ここで、１０サンプルに対して、それぞれの状態で上述の測定を行い、その平均値を、長さとした。このように測定した長さに基づいて、面積を算出できる。 Here, for the 10 samples, the above measurement was performed in each state, and the average value was defined as the length. Based on the measured length, the area can be calculated.
　レッグ開口部35は、製品幅方向外側から製品幅方向内側に向かう凸形状であり、使い捨ておむつ10の伸長状態のレッグ開口部35において最も製品幅方向内側に位置する内側端部35Iとレッグ伸縮部75との距離D2は、レッグ伸縮部と臀部伸縮部との製品幅方向における距離よりも短く、かつ１５ｍｍ以下である。 The leg opening 35 has a convex shape that extends from the outer side in the product width direction toward the inner side in the product width direction, and the inner end portion 35I that is located on the innermost side in the product width direction in the leg opening 35 in the stretched state of the disposable diaper 10 and the leg elastic part The distance D2 to 75 is shorter than the distance in the product width direction between the leg stretchable part and the heel stretchable part, and is 15 mm or less.
　使い捨ておむつ10の伸長状態におけるレッグ開口部35の内側端部35Iとレッグ伸縮部75との距離が１５mmよりも長いと、レッグ伸縮部75による収縮力がレッグ開口部35の内側端部まで作用せず、レッグ開口部35をレッグ伸縮部75によって適切に収縮させることができないおそれがある。また、レッグ開口部35の内側端部35Iは、着用された状態で着用者の脚によって挟まれ、着用者に密着する部分である。レッグ開口部35の内側端部35Iとレッグ伸縮部との距離が１５ｍｍ以下であることにより、少なくともレッグ開口部の着用者と密着する部分を収縮させ、着用者の脚回りに沿って配置できる。 When the distance between the inner end 35I of the leg opening 35 and the leg stretchable part 75 in the extended state of the disposable diaper 10 is longer than 15 mm, the contraction force by the leg stretchable part 75 acts on the inner end of the leg opening 35. Therefore, there is a possibility that the leg opening 35 cannot be properly contracted by the leg expansion / contraction part 75. Further, the inner end 35I of the leg opening 35 is a portion that is sandwiched between the legs of the wearer in a worn state and is in close contact with the wearer. When the distance between the inner end 35I of the leg opening 35 and the leg stretchable part is 15 mm or less, at least a portion of the leg opening that is in close contact with the wearer can be contracted and arranged along the legs of the wearer.
　サイドフラップ70には、レッグ伸縮部75と臀部伸縮部77とによって収縮されたフリル状の収縮部が形成される。レッグ伸縮部75と臀部伸縮部77によってフリル状の収縮部を身体に密着させることができる。また、レッグ開口部において最も製品幅方向内側に位置する内側端部35Iとレッグ伸縮部と距離が、レッグ伸縮部と臀部伸縮部との距離よりも短いため、レッグ伸縮部によってレッグ開口部の内側端部の巻き込みを抑制し、股下部から後胴回り域にかけて臀部伸縮部を配置し、サイドフラップの臀部伸縮部が配置された領域全体が広がった形状を維持し易くなる。 In the side flap 70, a frill-like contraction part contracted by the leg extension part 75 and the buttocks extension part 77 is formed. The leg stretchable part 75 and the buttocks stretchable part 77 can bring the frill-like contracted part into close contact with the body. In addition, the distance between the inner end 35I located at the innermost side in the product width direction and the leg stretchable part in the leg opening is shorter than the distance between the leg stretchable part and the heel stretchable part. It is easy to maintain the shape in which the entire region in which the buttock expansion / contraction part of the side flap is arranged is widened by suppressing the entanglement of the end part and disposing the heel expansion / contraction part from the crotch part to the rear waistline region.
　さらに、レッグ伸縮部75と臀部伸縮部77とによって形成されるフリルは、製品長手方向に伸縮するため、フリル（しわ）が、製品幅方向に沿って伸びる。このフリル（しわ）が支えになって、後胴回り域の製品幅方向端部の幅方向内側への巻き込みを防止できる。 Furthermore, since the frill formed by the leg elastic part 75 and the collar elastic part 77 expands and contracts in the product longitudinal direction, the frill extends along the product width direction. This frill (wrinkle) becomes a support and can prevent the product width direction end part of the rear waistline region from getting inward in the width direction.
　また、臀部伸縮部77は、全領域に亘って伸縮状態であってもよいし、その両端部の領域が非伸縮状態であってもよい。例えば、臀部伸縮部77の両端部の領域（10mm以下、2mm以上領域、より好ましくは5mm以下、2mm以上の領域）を非伸縮状態とすることにより、後側レッグ開口部３５Ｒ近傍においてしわを抑制した状態とできる。よって、後側レッグ開口部３５Ｒ近傍がより身体に隙間なく沿うことができる。また、臀部伸縮部77の端部にHMA接着剤等の接着剤を設けないことにより、臀部伸縮部77の端部が位置する後側レッグ開口部３５Ｒのエッジをやわらかくできる。 Further, the buttocks stretchable portion 77 may be stretched over the entire region, or the regions at both ends thereof may be in a non-stretched state. For example, wrinkles are suppressed in the vicinity of the rear leg opening 35R by making the regions (10 mm or less, 2 mm or more region, more preferably 5 mm or less, 2 mm or more region) at both ends of the collar expansion / contraction portion 77 non-stretchable. You can do it. Therefore, the vicinity of the rear leg opening 35R can more closely follow the body. In addition, by not providing an adhesive such as an HMA adhesive at the end of the collar expansion / contraction part 77, the edge of the rear leg opening 35R where the end of the collar expansion / contraction part 77 is positioned can be softened.
　レッグ開口部の内側端部35Iは、使い捨ておむつ10の自然状態において、レレッグ伸縮部と臀部伸縮部との製品幅方向における中心を通り、かつ製品長手方向に沿った中心線Ｌ２上に位置する。このような構成によれば、レッグ伸縮部と臀部伸縮部とによってレッグ開口部の内側端部を引き上げ、レッグ開口部の内側端部の巻き込みを防止することができる。よって、レッグ開口部の内側端部を身体に沿わせて配置できる。 The inner end 35I of the leg opening is located on the center line L2 along the product longitudinal direction through the center of the leg stretchable part and the heel stretchable part in the product width direction in the natural state of the disposable diaper 10. According to such a structure, the inner side edge part of a leg opening part can be pulled up by a leg elastic part and a collar part elastic part, and the entrainment of the inner side edge part of a leg opening part can be prevented. Therefore, the inner side edge part of a leg opening part can be arrange | positioned along a body.
　レッグ伸縮部75の伸長率は、1.7～2.4倍であることが好ましい。本実施形態では、使い捨ておむつの自然状態におけるレッグ伸縮部75の伸長率は、1.9～2.2倍に設定される。なお、レッグ伸縮部75の伸長率とは、レッグ伸縮部の伸長の程度を意味し、以下のように規定される。 The elongation rate of the leg stretchable part 75 is preferably 1.7 to 2.4 times. In the present embodiment, the extension rate of the leg stretchable part 75 in the natural state of the disposable diaper is set to 1.9 to 2.2 times. The extension rate of the leg stretchable part 75 means the degree of extension of the leg stretchable part, and is defined as follows.
　伸長率＝（伸長状態のレッグ伸縮部の長さ）÷（自然状態のレッグ伸縮部の長さ）
　また、臀部伸縮部77の伸長率は、１．６～２．４倍であることが好ましい。なお、臀部伸縮部77の伸長率とは、臀部伸縮部の伸長の程度を意味し、以下のように規定される。 Elongation rate = (length of leg stretchable part in stretched state) ÷ (length of leg stretchable part in natural state)
Further, it is preferable that the extension ratio of the heel expansion / contraction part 77 is 1.6 to 2.4 times. In addition, the expansion rate of the buttocks expansion / contraction part 77 means the degree of expansion of the buttocks expansion / contraction part, and is defined as follows.
　伸長率＝（伸長状態の臀部伸縮部の長さ）÷（自然状態の臀部伸縮部の長さ）
　なお、本明細書において、レッグ伸縮部75の伸長率及び臀部伸縮部77の伸長率は、例えば、次のように測定されるものとする。 Elongation rate = (length of the heel expansion / contraction part in the extended state) ÷ (length of the heel expansion / contraction part in the natural state)
In this specification, it is assumed that the elongation rate of the leg stretchable part 75 and the stretch rate of the heel stretchable part 77 are measured as follows, for example.
　第１に、使い捨ておむつ10がパッケージ等に封入されている場合には、パッケージから使い捨ておむつ10を取り出す。次いで、レッグ伸縮部、臀部伸縮部の両端に印をつける。 First, when the disposable diaper 10 is enclosed in a package or the like, the disposable diaper 10 is taken out from the package. Next, mark both ends of the leg stretchable part and the heel stretchable part.
　各サンプルについて、２０℃±２℃、相対湿度６０％±５％ＲＨの雰囲気下において６０分間放置し、自然状態の伸縮部長さ（印と印の間）をシンワ測定株式会社製のスプリングメジャー（テープ部：ガラス繊維入り塩ビ被覆）を用いて弾性部材に沿わせるようにして長さを測定する。この長さを、「レッグ伸縮部の自然状態の長さ」又は「臀部伸縮部の自然状態の長さ」とする。また、伸長状態の長さは、使い捨ておむつ10を自然状態から弾性部材によるしわが目視にて確認できない状態まで延伸して、伸長状態の伸縮部長さ（印と印の間）をシンワ測定株式会社製のスプリングメジャー（テープ部：ガラス繊維入り塩ビ被覆）を用いて弾性部材に沿わせるようにして長さを測定する。この長さを、「レッグ伸縮部の伸長状態の長さ」又は「臀部伸縮部の伸長状態の長さ」とする。 Each sample was left in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 60 minutes, and the length of the stretchable part in the natural state (between the marks) was measured by a spring measure manufactured by Shinwa Measurement Co., Ltd. The length is measured so as to be along the elastic member by using a tape portion: vinyl chloride containing glass fiber). This length is defined as “the natural length of the leg stretchable portion” or “the natural length of the heel stretchable portion”. In addition, the length of the stretched state is such that the disposable diaper 10 is stretched from the natural state to a state where wrinkles due to the elastic member cannot be visually confirmed, and the stretched length of the stretched portion (between marks) is measured by Shinwa Measurement Co., Ltd. The length is measured by using a spring measure (tape part: coated with vinyl chloride containing glass fiber) so as to be along the elastic member. This length is defined as “the length of the leg stretchable portion in the extended state” or “the length of the heel stretchable portion in the extended state”.
　これら測定結果を用い、上述の式にて算出することで伸長率が測定される。 Using these measurement results, the elongation percentage is measured by calculating with the above formula.
　（３）クロッチ伸縮部の形状
　次に、クロッチ伸縮部200の形状について説明する。クロッチ伸縮部200は、吸収体40の他の部分よりも、使い捨ておむつの着用時において股下域の一部に平坦な形状を維持できるように構成されている。クロッチ伸縮部200は、少なくとも製品長手方向Lまたは製品幅方向Wに伸縮可能に構成されている。 (3) Shape of Crotch Stretchable Part Next, the shape of the crotch stretchable part 200 will be described. The crotch stretchable part 200 is configured to maintain a flat shape in a part of the crotch region when the disposable diaper is worn rather than the other part of the absorber 40. The crotch stretchable portion 200 is configured to be stretchable at least in the product longitudinal direction L or the product width direction W.
　クロッチ伸縮部200は、レッグ伸縮部75とは個別独立して設けられており、吸収性コア40aと重なる位置（本実施形態では、吸収性コア40aを包むコアラップ40bとバックシート60aとの間の位置）において、当該重なる位置における吸収性コア40aの製品幅方向の長さの60％以上を収縮させるように構成されている。このように、クロッチ伸縮部200によって吸収性コア40aが配置された部分を収縮させることにより、吸収性コア40aが縮み、吸収性コア40aが縮まない部分と比較して平坦な形状を維持し易くなる。 The crotch stretchable part 200 is provided separately from the leg stretchable part 75 and overlaps the absorbent core 40a (in this embodiment, between the core wrap 40b that wraps the absorbent core 40a and the backsheet 60a). Position), 60% or more of the length in the product width direction of the absorbent core 40a at the overlapping position is contracted. In this way, by shrinking the portion where the absorbent core 40a is disposed by the crotch stretchable portion 200, the absorbent core 40a shrinks, and it is easy to maintain a flat shape compared to the portion where the absorbent core 40a does not shrink. Become.
　一方、クロッチ伸縮部200よりも製品長手方向外側に位置する前胴回り域や後胴回り域に位置する吸収性コア40aは、クロッチ伸縮部200によって収縮していない。したがって、ファスニングテープにより、着用者の腰・ウエスト回りに保持された状態において、使い捨ておむつの股下部に平坦な形状で維持されるクロッチ伸縮部200が過度に身体に密着することなく、結果、クロッチ伸縮部200が適度に身体に沿って配置される。 On the other hand, the absorbent core 40a located in the front waistline region and the rear waistline region located outside the product longitudinal direction from the crotch stretchable portion 200 is not contracted by the crotch stretchable portion 200. Therefore, the crotch stretchable part 200 that is maintained in a flat shape at the crotch part of the disposable diaper in a state of being held around the waist / waist of the wearer by the fastening tape does not excessively adhere to the body, resulting in the crotch. The stretchable part 200 is appropriately placed along the body.
　また、クロッチ伸縮部200が、製品長手方向Ｌに沿って伸縮可能である場合、前胴回り域20及び後胴回り域30が、クロッチ伸縮部200の収縮によって立ち上がり易くなり、着用時には、着用者の股部にて身体に沿って平坦な股下域を形成することができる。 In addition, when the crotch stretchable portion 200 is stretchable along the product longitudinal direction L, the front waistline region 20 and the back waistline region 30 are easily raised by contraction of the crotch stretchable portion 200, and when worn, A flat crotch region can be formed along the body at the part.
　その結果、クロッチ伸縮部200から前胴回り域20及び後胴回り域30が立ち上がるので、使い捨ておむつ１０の着用者へのフィット性が向上する。 As a result, since the front waistline region 20 and the back waistline region 30 rise from the crotch stretchable part 200, the fit of the disposable diaper 10 to the wearer is improved.
　すなわち、クロッチ伸縮部200の収縮によって、使い捨ておむつ１０の股下域２５が、着用者の股下部に配置されるように、安定して使い捨ておむつ１０を装着することができる。 That is, the disposable diaper 10 can be stably attached so that the crotch region 25 of the disposable diaper 10 is disposed in the crotch region of the wearer by the contraction of the crotch stretchable part 200.
　さらに、クロッチ伸縮部200は、製品長手方向Ｌにおける使い捨ておむつ１０の中心Ｏ１を跨いで前胴回り域20側及び後胴回り域30側に延びるように構成されていてもよい。 Furthermore, the crotch stretchable part 200 may be configured to extend to the front waistline region 20 side and the back waistline region 30 side across the center O1 of the disposable diaper 10 in the product longitudinal direction L.
　また、製品長手方向Ｌにおけるクロッチ伸縮部200の中心Ｏ２は、製品長手方向Ｌにおける使い捨ておむつ１０の中心Ｏ１よりも、前胴回り域20側に配置されている。 Further, the center O2 of the crotch expansion / contraction part 200 in the product longitudinal direction L is arranged on the front waistline region 20 side with respect to the center O1 of the disposable diaper 10 in the product longitudinal direction L.
　一方、着用者の動きがあった場合（特に、寝姿勢にて足を上げたり、立ったり、座ったりした際）には、着用者の身体の表面の皮膚の伸縮量（長さの変化量）は、腹側よりも背側（臀部）の方が大きくなる。 On the other hand, when there is movement of the wearer (especially when the legs are raised, standing, or sitting in the sleeping position), the amount of skin expansion and contraction (the amount of change in length) on the surface of the wearer's body ) Is larger on the dorsal side (buttock) than on the ventral side.
　製品長手方向Ｌにおけるクロッチ伸縮部200の中心Ｏ２を、製品長手方向Ｌにおける使い捨ておむつ１０の中心Ｏ１よりも、前胴回り域20側に配置することによって、使い捨ておむつ10の自然状態の後胴回り域30の製品長手方向Ｌの長さを前胴回り域20の製品長手方向Ｌの長さよりも長くすることができる。よって、着用者の動きがあった場合であっても、着用者の皮膚の動きに影響を受けて、使い捨ておむつ１０の前胴回り域20及び後胴回り域30が、製品長手方向Ｌに沿う向きに動いてしまうという事態を抑制することが可能となる。 By placing the center O2 of the crotch stretchable part 200 in the product longitudinal direction L closer to the front waistline region 20 than the center O1 of the disposable diaper 10 in the product longitudinal direction L, the rear waistline region 30 of the disposable diaper 10 in its natural state The length in the product longitudinal direction L of the product can be made longer than the length in the product longitudinal direction L of the front waistline region 20. Therefore, even if there is a movement of the wearer, the front waistline region 20 and the back waistline region 30 of the disposable diaper 10 are in a direction along the product longitudinal direction L due to the movement of the wearer's skin. It becomes possible to suppress the situation of moving.
　クロッチ伸縮部200は、伸縮性シートによって構成されることが好ましい。 The crotch stretchable part 200 is preferably composed of a stretchable sheet.
　伸縮性シートによってクロッチ伸縮部200を構成することにより、伸縮性シートを配置した領域の吸収性コア40aが一様に縮められ、平坦な形状維持がより容易になる。 By configuring the crotch stretchable portion 200 with the stretchable sheet, the absorbent core 40a in the region where the stretchable sheet is disposed is uniformly shrunk, and it becomes easier to maintain a flat shape.
　また、伸縮性シートの代わりに、ポリウレタン弾性繊維や天然ゴムからなる糸状・帯状の弾性部材を、複数本配置することによってクロッチ伸縮部200を構成してもよい。この場合、クロッチ伸縮部200によって吸収性コア40aを一様に縮めるためには、弾性部材同士の間隔を７ｍｍ以下、より好ましくは５ｍｍ以下であるとよい。また、吸収性コア40aを一様に縮めるために、隣り合う弾性部材の間隔の差は、２ｍｍ以下であることが望ましい。 Further, instead of the stretchable sheet, the crotch stretchable portion 200 may be configured by arranging a plurality of thread-like or band-like elastic members made of polyurethane elastic fiber or natural rubber. In this case, in order to uniformly shrink the absorbent core 40a by the crotch expansion / contraction part 200, the interval between the elastic members is 7 mm or less, more preferably 5 mm or less. Moreover, in order to shrink the absorptive core 40a uniformly, it is desirable that the difference in the interval between adjacent elastic members is 2 mm or less.
　また、クロッチ伸縮部200の伸長率は、具体的には、1.2倍以上、1.8倍以下であることが好ましい。本実施形態では、クロッチ伸縮部200の伸長率は、1.4倍に設定される。伸長率は、クロッチ伸縮部200の伸縮方向（製品長手方向L）における伸長の程度を意味し、以下のように規定される。 Further, specifically, the elongation rate of the crotch stretchable part 200 is preferably 1.2 times or more and 1.8 times or less. In this embodiment, the expansion rate of the crotch expansion / contraction part 200 is set to 1.4 times. The elongation rate means the degree of elongation in the expansion / contraction direction (product longitudinal direction L) of the crotch expansion / contraction part 200, and is defined as follows.
　伸長率は、伸縮方向（本実施形態では、製品長手方向Ｌ）におけるクロッチ伸縮部200の伸長の程度を意味し、以下のように規定される。 The elongation rate means the degree of expansion of the crotch expansion / contraction part 200 in the expansion / contraction direction (in the present embodiment, the product longitudinal direction L), and is defined as follows.
　伸長率＝（最大伸張状態におけるクロッチ伸縮部200の伸縮方向における長さ）/（自然状態におけるクロッチ伸縮部200の伸縮方向における長さ）
　なお、伸長率の測定は、上述のレッグ伸縮部と同様であり、説明を省略する。 Elongation rate = (length in the expansion / contraction direction of the crotch expansion / contraction part 200 in the maximum expansion state) / (length in the expansion / contraction direction of the crotch expansion / contraction part 200 in the natural state)
In addition, the measurement of an expansion rate is the same as that of the above-mentioned leg expansion-contraction part, and abbreviate | omits description.
　クロッチ伸縮部200の伸長率を、１.２倍以上１.８倍以下とすることによって、着用者の皮膚の伸縮に好適に追従することができる。 By setting the elongation rate of the crotch stretchable part 200 to 1.2 times or more and 1.8 times or less, it is possible to suitably follow the stretch of the wearer's skin.
　例えば、着用者が、身体前側が縮むような前屈みの姿勢をとると、着用者の臀部側の皮膚において、身体を伸ばした状態に対して３０％程度伸びる部位が存在する。 For example, when the wearer takes a forward-bending posture such that the front side of the body contracts, there is a site extending about 30% in the skin on the buttocks side of the wearer relative to the stretched body.
　つまり、クロッチ伸縮部200の伸長率を１.２倍未満とすると、自然状態におけるクロッチ伸縮部200の収縮が十分でなく、クロッチ伸縮部200が設けられていない場合と比較して、使い捨ておむつ10の股部における吸収体領域の収縮が小さく、着用者の股部において、身体に沿うように平坦な形状をとる事が不十分になってしまう。 That is, if the expansion rate of the crotch expansion / contraction part 200 is less than 1.2 times, the crotch expansion / contraction part 200 is not sufficiently contracted in the natural state, and the disposable diaper 10 is compared with the case where the crotch expansion / contraction part 200 is not provided. The shrinkage of the absorber region in the crotch of the wearer is small, and it becomes insufficient to take a flat shape along the body in the crotch of the wearer.
　一方、クロッチ伸縮部200の伸長率を１.８倍よりも大きくすると、クロッチ伸縮部200の収縮方向における収縮寸法が大きくなり過ぎるため、クロッチ伸縮部200が存在する領域が、身体に沿うよりも密着する状態となり易く、使い捨ておむつ１０が、着用者の下方にズレ易くなってしまう。 On the other hand, if the expansion rate of the crotch expansion / contraction part 200 is larger than 1.8 times, the contraction dimension of the crotch expansion / contraction part 200 in the contraction direction becomes too large. The disposable diaper 10 is likely to be in a close contact state, and easily displaced downward from the wearer.
　また、クロッチ伸縮部200の製品長手方向Ｌにおける収縮量は、使い捨ておむつ１０の製品長手方向Ｌにおける長さの２～８％となるように構成されていてもよい。 Further, the contraction amount of the crotch stretchable part 200 in the product longitudinal direction L may be configured to be 2 to 8% of the length of the disposable diaper 10 in the product longitudinal direction L.
　なお、収縮量は、皺が十分に小さくなり、サンプルの表面が平滑に近くなるように伸長した状態での長さ「ｂ（ｍｍ）」と、サンプルの伸縮方向に沿う向きにおける自然状態での長さ「ａ（ｍｍ）」との差であり、（ｂ-ａ）によって算出されることができる。 The amount of shrinkage is the length “b (mm)” in a stretched state so that the wrinkles are sufficiently small and the surface of the sample is almost smooth, and in the natural state in the direction along the stretching direction of the sample. It is the difference from the length “a (mm)” and can be calculated by (b−a).
　本発明者は、クロッチ伸縮部200の製品長手方向Ｌにおける収縮量を、使い捨ておむつ１０の製品長手方向Ｌにおける長さの２～８％とすると、使い捨ておむつ１０を着用者に対して装着する過程において、クロッチ伸縮部200が、好ましく着用者の身体に沿い易くなることを確認することができた。 The inventor assumes that the amount of contraction of the crotch stretchable part 200 in the product longitudinal direction L is 2 to 8% of the length of the disposable diaper 10 in the product longitudinal direction L, and the process of mounting the disposable diaper 10 on the wearer. In the above, it was confirmed that the crotch stretchable part 200 is preferably easily along the wearer's body.
　ここで、クロッチ伸縮部200の製品長手方向Ｌにおける収縮量を、８％より大きくすると、クロッチ伸縮部200が、縮み過ぎてしまい、使い捨ておむつ10の製品長手方向Ｌにおける長さが足りず、使い捨ておむつ10を着用者の身体に付け難くなったり、使い捨ておむつ10及び着用者の身体が、股下域25において、過度に密着してズレ易くなったりしてしまう。 Here, when the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is larger than 8%, the crotch stretchable part 200 is contracted too much, and the disposable diaper 10 is not sufficiently short in the product longitudinal direction L. It becomes difficult to attach the diaper 10 to the wearer's body, or the disposable diaper 10 and the wearer's body are in close contact with each other in the crotch region 25 and are likely to be displaced.
　一方、クロッチ伸縮部200の製品長手方向Ｌにおける収縮量を、２％未満とすると、使い捨ておむつ10を着用者の身体に近付けるというクロッチ伸縮部200の効果そのものが発現し難くなってしまう。 On the other hand, if the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is less than 2%, the effect itself of the crotch stretchable part 200 that brings the disposable diaper 10 closer to the wearer's body becomes difficult to manifest.
　また、製品長手方向Ｌにおけるクロッチ伸縮部200の中心は、製品長手方向Ｌにおける使い捨ておむつ10の中心よりも、前胴回り域20側に配置されている。また、クロッチ伸縮部200は、製品長手方向Ｌにおける使い捨ておむつ１０の中心を跨ぐように配置されている。 Further, the center of the crotch expansion / contraction portion 200 in the product longitudinal direction L is arranged on the front waistline region 20 side of the center of the disposable diaper 10 in the product longitudinal direction L. Moreover, the crotch expansion / contraction part 200 is arrange | positioned so that the center of the disposable diaper 10 in the product longitudinal direction L may be straddled.
　かかる場合、吸収性コア40aの剛性及び使い捨ておむつ10を構成する他の部材の剛性を考慮して、用いる弾性部材の太さや配置するピッチを適宜選択できるが、使い捨ておむつ10本体を自然状態（非伸張状態）とした際に、吸収性コア40aの製品幅方向Ｗにおける側縁部全域が収縮した状態となるようにすることが好ましい。 In such a case, considering the rigidity of the absorbent core 40a and the rigidity of other members constituting the disposable diaper 10, the thickness of the elastic member to be used and the pitch to be arranged can be appropriately selected. It is preferable that the entire side edge portion in the product width direction W of the absorbent core 40a is in a contracted state in the stretched state.
　また、吸収体40の股下域25には、切欠き115（切欠き125）が形成される。切欠き115及び切欠き125は、吸収体40を構成する吸収性コア40aが存在しない領域である。本実施形態において、切欠き115及び切欠き125は、吸収性コア40aの目付けが吸収性コア40aの他の部分よりも低い低剛性部に該当する。なお、切欠き115及び切欠き125を形成することに代えて、切欠き115及び切欠き125の領域を、吸収性コア40aの目付けが吸収性コア40aの他の部分よりも低くするようにしてもよい。 Also, a notch 115 (notch 125) is formed in the crotch region 25 of the absorber 40. The notch 115 and the notch 125 are regions where the absorbent core 40a constituting the absorber 40 is not present. In the present embodiment, the notch 115 and the notch 125 correspond to a low-rigidity part in which the basis weight of the absorbent core 40a is lower than other parts of the absorbent core 40a. Instead of forming the notch 115 and the notch 125, the area of the notch 115 and the notch 125 is set so that the basis weight of the absorbent core 40a is lower than the other parts of the absorbent core 40a. Also good.
　切欠き115及び切欠き125は、クロッチ伸縮部200の製品長手方向Lにおける縁部に沿って存在する。なお、切欠き115及び切欠き125が形成されていても、前胴回り域20及び後胴回り域30に位置する吸収性コア40aと、股下域25に位置する吸収性コア40aとは、完全に切り離されることなく特に製品幅方向において連続していることが好ましい。 The notch 115 and the notch 125 exist along the edge of the crotch stretchable part 200 in the product longitudinal direction L. Even if the notch 115 and the notch 125 are formed, the absorbent core 40a located in the front waistline region 20 and the rear waistline region 30 is completely separated from the absorbent core 40a located in the crotch region 25. It is preferable that it is continuous especially in the product width direction.
　切欠き115及び切欠き125は、製品幅方向W外側に行くに連れて製品長手方向Lにおける長さ（使い捨ておむつ10の自然状態）が広くなっている。このような形状により、吸収性コア40aの製品幅方向W外側がより縮み易くなるため、平坦な「底部」がより容易に形成される。更には、切欠き115よりも前胴回り域20寄りに位置する吸収性コア40a、及び切欠き125よりも後胴回り域30寄りに位置する吸収性コア40aが、「底部」から立ち上がり、着用者の体（腹部および臀部）の丸みに沿うように湾曲し易くなるため、使い捨ておむつそのものの形状が着用者の体の形により近づくことができる。 The notch 115 and the notch 125 become wider in the product longitudinal direction L (the natural state of the disposable diaper 10) as they go outward in the product width direction W. With such a shape, the outer side of the absorbent core 40a in the product width direction W is more easily contracted, so that a flat “bottom” is more easily formed. Furthermore, the absorbent core 40a located closer to the front waistline region 20 than the notch 115 and the absorbent core 40a located closer to the rear waistline region 30 than the notch 125 rise from the "bottom part", and the wearer's Since it becomes easy to curve along the roundness of the body (abdomen and buttocks), the shape of the disposable diaper itself can be closer to the shape of the wearer's body.
　また、切欠き115（切欠き125）の前胴回り域20（後胴回り域30）寄りの縁部は、円弧状である。切欠き115（切欠き125）の縁部は、円弧の中心が当該縁部よりも後胴回り域30（前胴回り域20）に位置するような形状である。このような形状により、着用者の体の丸みに沿った変形がより容易かつ顕著に起き易い。 Also, the edge of the notch 115 (notch 125) close to the front waistline region 20 (rear waistline region 30) is arcuate. The edge of the notch 115 (notch 125) is shaped such that the center of the arc is located in the rear waistline region 30 (front waistline region 20) with respect to the edge. With such a shape, deformation along the roundness of the wearer's body is easier and more likely to occur.
　製品幅方向Ｗにおけるクロッチ伸縮部２００の幅は、吸収性コア４０ａのクロッチ伸縮部が存在する領域における、製品幅方向Ｗにおける吸収性コア４０ａの幅の１／２以上である。 The width of the crotch stretchable part 200 in the product width direction W is ½ or more of the width of the absorbent core 40a in the product width direction W in the region where the crotch stretchable part of the absorbent core 40a exists.
　従って、クロッチ伸縮部２００によって吸収性コア４０ａが配置された部位の一定幅以上を収縮させることによって、吸収性コア４０ａが縮み、着用者の身体に近づくように吸収性コア４０ａが持ち上がる。 Therefore, by contracting a certain width or more of the portion where the absorbent core 40a is disposed by the crotch stretchable part 200, the absorbent core 40a contracts and the absorbent core 40a is lifted so as to approach the wearer's body.
このような吸収性コア４０ａの持ち上がり股下域で実現することによって、使い捨ておむつ１０と着用者との間の隙間を減少することができる。製品幅方向Ｗにおけるクロッチ伸縮部２００の幅が製品幅方向Ｗにおける吸収体４０（吸収性コア４０ａ）の幅の６０％以上である場合、より好ましくは80%以上である場合には、使い捨ておむつ１０と着用者との間の隙間をさらに減少することができる。 The gap between the disposable diaper 10 and the wearer can be reduced by realizing such a raised crotch region of the absorbent core 40a. When the width of the crotch stretchable part 200 in the product width direction W is 60% or more of the width of the absorbent body 40 (absorbent core 40a) in the product width direction W, more preferably 80% or more, disposable diapers The gap between 10 and the wearer can be further reduced.
　更には、クロッチ伸縮部２００の幅が吸収性コア４０ａの幅と比較して狭すぎると、上述した吸収性コア４０ａを持ち上げる効果が得られにくい。一方、クロッチ伸縮部２００の幅が吸収性コア４０ａの幅と比較して広すぎると、吸収性コア４０ａが配置されていない部位が、吸収性コア４０ａが配置されている部位よりも収縮した状態で、使い捨ておむつ１０が装着される。これによって、吸収性コア４０ａが配置されていない部位を構成する部材が重なりあって、クロッチ伸縮部２００が硬くなり、使い捨ておむつ１０の履き心地が損なわれる。 Furthermore, if the width of the crotch stretchable part 200 is too narrow compared to the width of the absorbent core 40a, it is difficult to obtain the effect of lifting the absorbent core 40a described above. On the other hand, when the width of the crotch stretchable portion 200 is too wide compared to the width of the absorbent core 40a, the portion where the absorbent core 40a is not disposed contracts more than the portion where the absorbent core 40a is disposed. The disposable diaper 10 is attached. As a result, the members constituting the portion where the absorbent core 40a is not disposed overlap each other, the crotch stretchable portion 200 becomes hard, and the comfort of the disposable diaper 10 is impaired.
　例えば、吸収性コア４０ａのクロッチ伸縮部が存在する領域における、最も幅が狭い部位の寸法（伸長状態における）１２０ｍｍである場合において、クロッチ伸縮部２００の幅は、６０～１１０ｍｍであることが好ましい。さらに好ましくは、クロッチ伸縮部２００の幅は、９０～１１０ｍｍであることが好ましい。 For example, when the dimension of the narrowest part (in the extended state) is 120 mm in the region where the crotch stretch part of the absorbent core 40a exists, the width of the crotch stretch part 200 is preferably 60 to 110 mm. . More preferably, the width of the crotch stretchable part 200 is 90 to 110 mm.
　製品幅方向Ｗにおいて吸収性コア４０ａの幅が最も狭い部位は、製品長手方向中心線に対して１０～６０ｍｍ前側に設けられることが好ましい。好ましくは、製品幅方向Ｗにおいて吸収性コア４０ａの幅が最も狭い部位は、製品長手方向中心線に対して２０～４０ｍｍ前側に設けられる。クロッチ伸縮部２００は、製品幅方向Ｗにおいて吸収性コア４０ａの幅が最も狭い部位を跨がって形成されることが好ましい。 The part where the width of the absorbent core 40a is the narrowest in the product width direction W is preferably provided 10 to 60 mm in front of the center line in the product longitudinal direction. Preferably, the portion where the width of the absorbent core 40a is narrowest in the product width direction W is provided on the front side of the product longitudinal direction by 20 to 40 mm. The crotch stretchable part 200 is preferably formed across a region where the width of the absorbent core 40a is narrowest in the product width direction W.
　着用者の左右の大腿部が互いに最も近接する位置は、着用者の身体の前後方向における中心よりも前側である。従って、クロッチ伸縮部２００の収縮力によって、製品幅方向Ｗにおいて吸収性コア４０ａの幅が最も狭い部位を着用者の左右の大腿部が互いに最も近接する位置に積極的に配置することができる。言い換えると、母親などの着用補助者が吸収性コア４０ａの位置合わせを行わなくても、吸収性コア４０ａの位置合わせが自然と行われる。 The position where the left and right thighs of the wearer are closest to each other is the front side of the center of the wearer's body in the front-rear direction. Therefore, the portion where the width of the absorbent core 40a is the narrowest in the product width direction W can be positively arranged at the position where the left and right thighs of the wearer are closest to each other by the contraction force of the crotch stretchable portion 200. . In other words, even if a wear assistant such as a mother does not align the absorbent core 40a, the absorbent core 40a is naturally aligned.
　（４）使い捨ておむつの製造方法
　次に、本実施形態に係る吸収性物品の製造方法の一例について説明する。なお、本実施形態において説明しない方法については、既存の方法を用いることができる。また、以下に説明する製造方法は、一例であり、他の製造方法によって製造することもできる。吸収性物品の製造方法は、構成部品形成工程と、構成部品載置工程と、脚回り形成工程と、切断工程とを少なくとも含む。 (4) Manufacturing method of disposable diaper Next, an example of the manufacturing method of the absorbent article which concerns on this embodiment is demonstrated. In addition, about the method which is not demonstrated in this embodiment, the existing method can be used. Moreover, the manufacturing method demonstrated below is an example and can also be manufactured with another manufacturing method. The manufacturing method of an absorbent article includes at least a component part forming step, a component part placing step, a leg periphery forming step, and a cutting step.
　構成部品形成工程では、吸収性物品を構成する構成部品を形成する。具体的には、例えば、吸収材料を積層して吸収体40を成型する。 In the component forming process, the components constituting the absorbent article are formed. Specifically, for example, the absorbent body 40 is molded by laminating absorbent materials.
　構成部品載置工程では、バックシートを構成するウェブ上に、レッグ伸縮部75を構成する伸縮性シートや、トップシートを構成するウェブ等の他のウェブ、防漏シート、吸収体、レッグ伸縮部75、臀部伸縮部77等の使い捨ておむつ10を構成する構成部品を載置する。 In the component mounting step, on the web constituting the back sheet, the elastic sheet constituting the leg stretchable part 75, the other web such as the web constituting the top sheet, the leakproof sheet, the absorber, the leg stretchable part The component parts which comprise the disposable diaper 10, such as 75 and the buttocks expansion-contraction part 77, are mounted.
　このとき、レッグ伸縮部75と臀部伸縮部77とを長手方向に同じ伸長率で伸長させて配置する。 At this time, the leg stretchable part 75 and the buttocks stretchable part 77 are arranged to be stretched in the longitudinal direction at the same stretch rate.
　脚回り形成工程は、トップシート50、外装シート60、及びバックシート60aを切断する。これにより、臀部伸縮部77の前端部77Fが切断され、かつ着用者の脚回りに配置されるレッグ開口部35が形成される。 In the leg periphery forming step, the top sheet 50, the exterior sheet 60, and the back sheet 60a are cut. As a result, the front end portion 77F of the buttocks stretchable portion 77 is cut, and the leg opening 35 is formed around the wearer's leg.
　切断工程では、トップシート50、バックシート60a、吸収体40等が配置された連続体を製品幅方向Ｗに沿って一製品の大きさに切断する。これにより、使い捨ておむつ10が製造される。 In the cutting process, the continuous body in which the top sheet 50, the back sheet 60a, the absorber 40, and the like are arranged is cut into the size of one product along the product width direction W. Thereby, the disposable diaper 10 is manufactured.
　使い捨ておむつが切断されることにより、レッグ伸縮部75及び臀部伸縮部77は自然状態となる。レッグ伸縮部75は、図２に示すように、外装シート60、バックシート60a、及びサイドフラップ70が積層された領域に配置されており、臀部伸縮部77は、外装シート60及びサイドフラップ70が積層された領域に配置されている。よって、自然状態において臀部伸縮部77は、レッグ伸縮部よりも収縮し、臀部伸縮部の伸長率がレッグ伸縮部の伸長率よりも高くなる。 When the disposable diaper is cut, the leg stretchable part 75 and the buttocks stretchable part 77 are in a natural state. As shown in FIG. 2, the leg stretchable part 75 is disposed in a region where the exterior sheet 60, the backsheet 60 a, and the side flap 70 are laminated, and the collar stretchable part 77 is composed of the exterior sheet 60 and the side flap 70. Arranged in the stacked region. Therefore, in the natural state, the heel expansion / contraction part 77 contracts more than the leg expansion / contraction part, and the extension ratio of the heel expansion / contraction part becomes higher than the extension ratio of the leg expansion / contraction part.
　（５）その他の実施形態
　上述したように、本発明の実施形態を通じて本発明の内容を開示したが、この開示の一部をなす論述及び図面は、本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなる。 (5) Other Embodiments As described above, the contents of the present invention have been disclosed through the embodiments of the present invention. However, it is understood that the description and drawings constituting a part of this disclosure limit the present invention. Should not. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.
　レッグ伸縮部75は、レッグサイドギャザーの接合部分と製品幅方向において一致していてもよいし、レッグサイドギャザーの接合部分よりも製品幅方向内側に配置されていてもよい。レッグ伸縮部75及び臀部伸縮部77を構成する弾性部材は、１本であってもよいし、２本以上であってもよい。 The leg stretchable part 75 may coincide with the joined part of the leg side gathers in the product width direction, or may be arranged on the inner side in the product width direction than the joined part of the leg side gathers. The elastic members constituting the leg stretchable part 75 and the collar stretchable part 77 may be one, or may be two or more.
　また、上述した実施形態では、オープンタイプの使い捨ておむつを例として説明したが、本発明は、パンツ型の使い捨ておむつに適用することもできる。前胴回り域と後胴回り域を形成する外層シートの左右両側縁部が接合されることで胴回り開口部と一対のレッグ開口部を有するパンツ形状おむつについては、前胴回り域及び後胴回り域の外層シートは製品幅方向Wに収縮及び伸長可能となる弾性要素を有しており、それらを収縮することで着用者の胴回りに使い捨ておむつが保持される。つまり、製品長手方向Lに伸びる左右両側縁部が接合されている範囲が胴回り保持部となる。 In the above-described embodiment, an open type disposable diaper has been described as an example, but the present invention can also be applied to a pants-type disposable diaper. For pants-shaped diapers having a waistline opening and a pair of leg openings by joining the right and left side edges of the outer layer sheet forming the front waistline and the back waistline, the outer layer sheets of the front waistline and the back waistline Has an elastic element that can be contracted and extended in the product width direction W, and the disposable diaper is held around the wearer's waist by contracting them. That is, the range where the left and right side edges extending in the product longitudinal direction L are joined is the waistline holding portion.
　このように、本発明は、ここでは記載していない様々な実施形態などを含むことは勿論である。したがって、本発明の技術的範囲は、上述の説明から妥当な請求の範囲に係る発明特定事項によってのみ定められるものである。 As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the appropriate claims from the above description.
　なお、日本国特許出願２０１２―２５９１５９号（２０１２年１１月２７日出願）の全内容が、参照により、本願明細書に組み込まれている。 The entire contents of Japanese Patent Application No. 2012-259159 (filed on November 27, 2012) are incorporated herein by reference.
　脚回りのフィット性を維持しつつ、臀部を覆う後胴回り域のずれを抑制することができる使い捨ておむつを提供することができる。 It is possible to provide a disposable diaper that can suppress the shift of the rear waistline region that covers the buttocks while maintaining the fit around the legs.
10　　　：使い捨ておむつ
20　　　：前胴回り域
25　　　：股下域
30　　　：後胴回り域
35　　　：レッグ開口部
35I　　：内側端部
35F　　　：前側レッグ開口部
35R　　　：後側レッグ開口部
40　　　：吸収体
40a　　：吸収性コア
40b　　：コアラップ
50　　　：トップシート
60　　　：外装シート
60a　　：バックシート
70　　　：サイドフラップ
75　　　：レッグ伸縮部
77　　　：臀部伸縮部
77F　　：前端部
80　　　：レッグサイドギャザー
81　　　：弾性部材
85　　　：腰回り伸縮部
90　　　：ファスニングテープ
91　　　：基材シート
92　　　：フックシート
95　　　：ターゲット部
115　　：切欠き
125　　：切欠き
200　　：クロッチ伸縮部
L　　　　：製品長手方向
W　　　　：製品幅方向 10: disposable diapers
20: Front waist area
25: Inseam area
30: Rear waist area
35: Leg opening
35I: Inside edge
35F: Front leg opening
35R: Rear leg opening
40: Absorber
40a: Absorbent core
40b: Core wrap
50: Top sheet
60: exterior sheet
60a: Back sheet
70: Side flap
75: Leg stretchable part
77: Hip elastic part
77F: Front end
80: Legside gather
81: Elastic member
85: waist elastic part
90: Fastening tape
91: Base sheet
92: Hook sheet
95: Target section
115: Notch
125: Notch
200: Crotch expansion / contraction part
L: Product longitudinal direction
W: Product width direction

Claims (8)

  1. 　前胴回り域と、後胴回り域と、前記前胴回り域と前記後胴回り域との間に位置する股下域とを有し、
    　前記前胴回り域から前記後胴回り域に向かう製品長手方向と、前記製品長手方向と直交する製品幅方向と、を有し、
    　前記股下域を跨ぎ、かつ前記前胴回り域と前記後胴回り域の少なくとも一方に延びる吸収体と、
    　前記前胴回り域、前記股下域、及び前記後胴回り域を跨ぎ、かつ前記吸収体よりも前記製品幅方向外側に配置されるサイドフラップと、
    　前記サイドフラップの前記後胴回り域から製品幅方向外側に延出し、前記前胴回り域に止着する一対のファスニングテープと、を備え、
    　前記サイドフラップには、前記吸収体の前記製品幅方向における中心に向かって凹んだレッグ開口部と、前記レッグ開口部よりも製品幅方向内側に配置され、かつ前記製品長手方向に伸縮するレッグ伸縮部と、が形成されており、
    　前記レッグ開口部は、前記レッグ開口部の前記製品長手方向中心よりも後方に位置する後側レッグ開口部と、前記レッグ開口部の前記製品長手方向中心よりも前方に位置する前側レッグ開口部とを有しており、
    　前記後側レッグ開口部と、前記製品幅方向における中心を通り製品長手方向に平行な直線との間の面積は、前記前側レッグ開口部と、前記製品幅方向における中心を通り前記製品長手方向に延びる直線との間の面積よりも広く、
    　前記レッグ伸縮部よりも前記製品幅方向外側には、前記股下域と前記後胴回り域とに跨って配置され、かつ前記製品長手方向に伸縮する臀部伸縮部が配置され、
    　前記臀部伸縮部の伸長率は、前記レッグ伸縮部の伸長率よりも高い、使い捨ておむつ。     A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
    A product longitudinal direction from the front waistline region to the rear waistline region, and a product width direction orthogonal to the product longitudinal direction,
    An absorbent body straddling the crotch region and extending to at least one of the front waistline region and the rear waistline region;
    A side flap that straddles the front waistline region, the crotch region, and the rear waistline region, and is disposed on the outer side in the product width direction than the absorber;
    A pair of fastening tapes extending outward in the product width direction from the rear waistline region of the side flaps and fastened to the front waistline region,
    The side flap includes a leg opening that is recessed toward the center in the product width direction of the absorber, and a leg stretch that is disposed on the inner side in the product width direction than the leg opening and expands and contracts in the product longitudinal direction. Part is formed,
    The leg opening includes a rear leg opening positioned rearward of the product longitudinal center of the leg opening, and a front leg opening positioned forward of the product longitudinal center of the leg opening. Have
    The area between the rear leg opening and a straight line passing through the center in the product width direction and parallel to the product longitudinal direction is the front leg opening and passing through the center in the product width direction in the product longitudinal direction. Wider than the area between the extending straight line,
    On the outer side in the product width direction than the leg stretchable part, a collar part stretchable part that is disposed across the crotch region and the rear waistline region and stretches in the product longitudinal direction is disposed,
    The disposable diaper has a higher stretch rate of the heel stretchable portion than the stretch rate of the leg stretchable portion.
  2. 　前記臀部伸縮部の前記製品長手方向中心は、前記レッグ伸縮部の前記製品長手方向中心よりも後方に位置する、請求項１に記載の使い捨ておむつ。 The disposable diaper according to claim 1, wherein the product longitudinal direction center of the buttocks stretchable part is located behind the product longitudinal direction center of the leg stretchable part.
  3. 　前記レッグ伸縮部の前記製品長手方向の中心及び前記レッグ開口部の前記製品長手方向の中心は、前記使い捨ておむつの前記製品長手方向の中心よりも前方に位置する、請求項１又は請求項２に記載の使い捨ておむつ。 The center of the product longitudinal direction of the leg stretchable part and the center of the product longitudinal direction of the leg opening are located forward of the center of the disposable diaper in the product longitudinal direction. The disposable diaper described.
  4. 　前記製品幅方向における前記臀部伸縮部と前記レッグ伸縮部との距離は、１０ｍｍ～３０ｍｍである、請求項１から請求項３のいずれかに記載の使い捨ておむつ。 The disposable diaper according to any one of claims 1 to 3, wherein a distance between the elongate elastic part and the leg elastic part in the product width direction is 10 mm to 30 mm.
  5. 　前記レッグ開口部において最も製品幅方向内側に位置する内側端部と前記レッグ伸縮部との距離は、前記レッグ伸縮部と前記臀部伸縮部との距離よりも短く、かつ１５ｍｍ以下である、請求項１から請求項４のいずれかに記載の使い捨ておむつ。 The distance between the inner end portion located on the innermost side in the product width direction in the leg opening and the leg stretchable portion is shorter than the distance between the leg stretchable portion and the collar stretchable portion, and is 15 mm or less. The disposable diaper according to any one of claims 1 to 4.
  6. 　前記レッグ開口部の内側端部は、前記レッグ伸縮部と前記臀部伸縮部との製品幅方向における中心を通り、かつ前記製品長手方向に沿った中心線上に位置する、請求項５に記載の使い捨ておむつ。 The disposable inner end according to claim 5, wherein an inner end portion of the leg opening portion is located on a center line in the product width direction of the leg stretchable portion and the flange stretchable portion and along the product longitudinal direction. Diapers.
  7. 　前記後側レッグ開口部には、前記製品幅方向外側に向けて凸状となる凸部が形成されている、請求項１から請求項６のいずれかに記載の使い捨ておむつ。 The disposable diaper according to any one of claims 1 to 6, wherein a convex portion that is convex outward in the product width direction is formed in the rear leg opening.
  8. 　前記前側レッグ開口部には、前記製品幅方向内側に向けて凹む形状となる凹部が形成されている、請求項１から請求項７のいずれかに記載の使い捨ておむつ。 The disposable diaper according to any one of claims 1 to 7, wherein the front leg opening is formed with a recess that is recessed toward the inside in the product width direction.
PCT/JP2013/081862 2012-11-27 2013-11-27 Disposable diaper WO2014084236A1 (en)

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