WO2022264558A1 - 使い捨ておむつ - Google Patents

使い捨ておむつ Download PDF

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Publication number
WO2022264558A1
WO2022264558A1 PCT/JP2022/010689 JP2022010689W WO2022264558A1 WO 2022264558 A1 WO2022264558 A1 WO 2022264558A1 JP 2022010689 W JP2022010689 W JP 2022010689W WO 2022264558 A1 WO2022264558 A1 WO 2022264558A1
Authority
WO
WIPO (PCT)
Prior art keywords
absorbent body
absorbent
sheet
basis weight
crotch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/010689
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
祐里香 ▲高▼木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daio Paper Corp
Original Assignee
Daio Paper Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daio Paper Corp filed Critical Daio Paper Corp
Priority to EP22824558.5A priority Critical patent/EP4356891A4/en
Priority to CN202280032919.1A priority patent/CN117241769A/zh
Priority to BR112023016995A priority patent/BR112023016995A2/pt
Publication of WO2022264558A1 publication Critical patent/WO2022264558A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • 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 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 specially adapted to be worn around the waist, e.g. diapers, nappies
    • A61F13/496—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 specially adapted to be worn around the waist, e.g. diapers, nappies in the form of pants or briefs
    • 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
    • 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
    • A61F13/53—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 absorbing medium
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/531—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 absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—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 absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/533—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 absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having discontinuous areas of compression
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—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 absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—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 absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A61F13/536—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 absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes having discontinuous areas of compression

Definitions

  • the present invention relates to a disposable diaper that achieves both the fit of the absorbent element and the shape retention of the absorbent body in the crotch area.
  • Disposable diapers generally use an absorber obtained by mixing and accumulating pulp fibers and superabsorbent polymer particles. It is common to incorporate a wrapping sheet made of crepe paper or the like as an absorbent element (see, for example, Patent Document 1).
  • the absorbent element of a disposable diaper When the absorbent element of a disposable diaper is sandwiched between the legs, it receives forces in various directions from both sides in the width direction due to movement of the legs such as walking. There is also a demand for shape retention in order to prevent deformation such as twisting and cracking of the body. Of course, the absorbent elements of disposable diapers are also required to ensure an absorbent amount in the crotch area.
  • low basis weight parts such as slits penetrating in the thickness direction along the front-rear direction on both sides in the width direction of the absorbent body in the crotch area.
  • the force concentrates on the portion of the absorbent body located on the side of the low basis weight portion, and twists and cracks are likely to occur.
  • the main object of the present invention is to achieve both the fit of the absorbent element and the shape retention of the absorbent body in the crotch area.
  • Disposable diapers that solve the above problems are as follows. ⁇ First Aspect> It has a crotch portion and a front portion and a rear portion extending forward and rearward from the crotch portion, An absorbent element provided in the front-rear direction range including the crotch portion, and an absorbent element having a packaging sheet wrapping the absorbent body,
  • the absorber is formed by mixing and accumulating pulp fibers and superabsorbent polymer particles
  • the absorbent body has elongated low basis weight parts extending in the front-rear direction on both sides in the width direction of the crotch part, A pattern in which compressed portions that are compressed in the thickness direction so as to be depressed from at least one of the front surface and the back surface of the absorbent element to the absorbent body are continuous in a lattice pattern over at least the entire area lateral to the low basis weight portion of the absorbent element.
  • the packaging sheet has a bending resistance measured by the 41.5° cantilever method specified in JIS L 1913:2010 of 0.01 to 0.10 mN cm in the front-rear direction and 0.01 to 0.10 mN in the width direction. ⁇ It is a non-woven fabric of cm, A disposable diaper characterized by:
  • the features of this disposable diaper are: (a) the provision of a low basis weight portion promotes bending of the absorbent body along the low basis weight portion to improve the fit of the absorbent element in the crotch region; (c) The lattice-like compression part suppresses the twisting and cracking of the part located on the side of the low basis weight part of the absorbent body, which is likely to occur due to the The resulting decrease in the fit of the crotch part is suppressed by adopting a flexible packaging sheet without impairing the function of preventing twisting and cracking by the grid-like compression part. Therefore, according to the present disposable diaper, it is possible to achieve both the fitting property of the absorbent element and the shape retention property of the absorbent body in the crotch region compared to the conventional one.
  • the width of the narrowest part of the crotch part of the absorbent body is 0.85 to 1 times the total width of the front and rear parts.
  • the fit of the absorbent element in the crotch portion can be maintained while ensuring the absorption capacity of the crotch portion. It is possible to achieve both shape retention of the crotch portion.
  • the width of the narrowest portion of the crotch portion is approximately 0.79 times the full width of the front and rear portions.
  • the pulp fibers in the absorbent body have a basis weight of 100 to 450 g/m 2 ,
  • the weight ratio of pulp fibers: superabsorbent polymer particles in the absorbent body is from 50:50 to 20:80,
  • An absorbent body with a high content of superabsorbent polymer particles as in this embodiment is preferable from the viewpoint of ensuring the absorption capacity and preventing reversion, but the side portion of the absorbent body from the low basis weight part is twisted or cracked. is likely to occur.
  • the absorption amount as a whole
  • the width of the compressed portion is 1 to 3 mm
  • the thickness of the compressed portion is 15 to 35% of the maximum thickness of the absorbent element
  • the compression portion is composed of a first portion inclined 40 to 50 degrees clockwise in plan view with respect to the front-rear direction and a second portion inclined 40 to 50 degrees counterclockwise in plan view with respect to the front-rear direction. It is formed in a diagonal lattice shape, Two or more rows of unit frames are provided in the width direction on at least a part of the side of the low basis weight portion, and the unit frames made of the compression portion are repeated in the front-rear direction.
  • the size and shape of the compression portion can be determined as appropriate, it is preferable to be configured as in this aspect.
  • the absorbent element is excellent in fit and shape retention in the portions lateral to the low basis weight portion.
  • ⁇ Fifth Aspect> At least over the entire region lateral to the low basis weight portion, the surface on the side having at least the depression of the compressed portion among the front surface and the back surface of the absorbent body, and the inner surface of the packaging sheet are 5.0 to 20.0. bonded via a 0 g/m 2 hot melt adhesive, A disposable diaper according to the fourth aspect.
  • the ability to maintain the shape of the absorbent element by the compressed portion depends on the maintainability of the compressed portion itself, and the maintainability of the compressed portion itself depends on the bonding strength between the packaging sheet and the absorbent body in the compressed portion and the shape maintenance ability of the absorbent body itself. be done. As the surface area increases due to the formation of the compressed portion, more hot-melt adhesive than usual is required in order to sufficiently maintain the bonding strength between the packaging sheet and the absorbent body and the shape retention of the absorbent body itself. Therefore, as in this aspect, not only the inner surface of the packaging sheet and the outer surface of the absorbent body are bonded with a hot-melt adhesive, but also the front and back surfaces of the absorbent body at least over the entire area lateral to the low basis weight portion. It is preferable to use a sufficiently large amount of the hot-melt adhesive for bonding at least the surface of the compressed portion having the recess and the inner surface of the packaging sheet.
  • the packaging sheet has an elongation rate of 20 to 100% in the front-back direction at the standard time specified in JIS L 1913: 2010, In the width direction, the elongation rate at the standard time specified in JIS L 1913: 2010 is 20 to 110%.
  • a disposable diaper according to any one of aspects 1 to 5.
  • the packaging sheet has the degree of extensibility of this aspect, the flexibility of the absorbent element is improved without impairing the performance of preventing twisting and cracking due to the lattice-like compression part, and the fit of the absorbent element in the crotch part is improved. improve sexuality.
  • FIG. 2 is a plan view showing the inner surface of the underpants-type disposable diaper in an unfolded state;
  • Fig. 2 is a plan view showing the outer surface of the pants-type disposable diaper in an unfolded state;
  • FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1;
  • 3 is a cross-sectional view taken along line 3-3 of FIG. 1;
  • FIG. (a) 4-4 cross-sectional view of FIG. 1, and (b) 5-5 cross-sectional view of FIG. 1 is a perspective view of a pants-type disposable diaper;
  • FIG. FIG. 4 is a plan view showing the outer surface of the inner body in the unfolded state together with the outline of the outer body;
  • FIG. 4 is a plan view showing the surface of the absorbent body together with the outline of the packaging sheet.
  • Fig. 3 is a cross-sectional view of an absorbent element
  • Fig. 2 is a plan view of an absorbent element
  • FIG. 4 is an enlarged view of the main part of the surface of the absorbent element
  • FIG. 4 is a plan view showing another example of the absorbent body
  • Fig. 2 is a cross-sectional view showing the absorbent element in a state before wrapping the absorbent core with the wrapping sheet
  • FIG. 4 is a cross-sectional view showing the absorbent element in a state before forming a compressed portion after wrapping the absorbent body with the wrapping sheet.
  • a dotted pattern portion in the cross-sectional view indicates an adhesive such as a hot-melt adhesive as the fixing or joining means.
  • the hot-melt adhesive can be applied by slot coating, continuous-line or dotted-line bead coating, spiral-shaped, Z-shaped, wavy-shaped spray coating, or pattern coating (transfer of hot-melt adhesive by letterpress method). can be applied by any method.
  • a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member.
  • Hot-melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester-polyamide-based adhesives, and can be used without particular limitation.
  • a material welding means such as heat sealing or ultrasonic sealing can be used. In portions where liquid permeability in the thickness direction is required, adjacent components in the thickness direction are fixed or joined in an intermittent pattern.
  • intermittent pattern coating such as spiral, Z-shaped, and wavy patterns can be preferably used, and the range of coating width by one nozzle or more can be preferably used.
  • intermittent pattern coating such as spiral, Z-shape, wave-like, etc. can be performed with or without spacing in the width direction.
  • a joining means for joining each constituent member a means by material welding such as heat sealing or ultrasonic sealing can be used.
  • nonwoven fabric in the following description, a known nonwoven fabric can be appropriately used depending on the site and purpose.
  • Constituent fibers of non-woven fabrics include, for example, synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene (including composite fibers such as core-sheath fibers in addition to single-component fibers), as well as recycled rayon and cupra.
  • Fibers, natural fibers such as cotton, etc. can be selected without particular limitation, and these can also be mixed and used.
  • nonwoven fabrics are generally classified into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bonded (air-through) nonwoven fabrics, and needle punched nonwoven fabrics, depending on the fiber length, sheet forming method, fiber bonding method, and laminate structure.
  • Nonwoven fabrics are classified into nonwoven fabrics, point-bonded nonwoven fabrics, laminated nonwoven fabrics (including SMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers, SMMS nonwoven fabrics, etc.), etc., and any of these nonwoven fabrics can be used.
  • This pants-type disposable diaper includes a rectangular front exterior body 12F forming a front waist portion, a rectangular rear exterior body 12B forming a rear waist portion, and a rear exterior body 12F from the front exterior body 12F through a crotch portion M. and an interior body 200 provided inside the exterior bodies 12F and 12B so as to extend to the exterior body 12B.
  • Side seals 12A are formed by joining both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B.
  • a waist opening WO through which the torso passes, and leg openings LO through which the legs pass are formed on both sides in the width direction of the inner body 200 surrounded by the lower edges of the outer bodies 12F and 12B and the side edges of the inner body 200, respectively.
  • the inner body 200 is a part that absorbs and holds excrement such as urine
  • the outer bodies 12F and 12B are parts that support the inner body 200 against the wearer's body.
  • Symbol Y indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the diaper in the unfolded state. shows the full width of
  • This pants-type disposable diaper has a waist region T defined as a front-back direction range having side seals 12A (a front-back direction range from the waist opening WO to the upper ends of the leg openings LO), and a front-back direction range of a portion forming the leg openings LO.
  • a front-back direction range having side seals 12A a front-back direction range from the waist opening WO to the upper ends of the leg openings LO
  • a front-back direction range of a portion forming the leg openings LO Between the longitudinal region having the side seals 12A of the front body F and the longitudinal region having the side seals 12A of the back body B).
  • the parts located in the waist region T in the front and rear armor bodies 12F and 12B that is, the front waist circumference part and the rear waist circumference part, conceptually form the edge of the waist opening. and a "lower waist portion" U that is lower than this.
  • the waist portion W is on the side of the waist opening WO, and if there is no such boundary, the waist extending portion 12E extending from the absorbent body 56 or the inner body 200 to the side of the waist opening WO is the waist portion W.
  • the length in the front-rear direction differs depending on the size of the product and can be determined as appropriate.
  • the waist portion W can be 15 to 40 mm, and the lower waist portion U can be 65 to 120 mm.
  • both side edges of the intermediate region L are constricted in a U-shape or curvilinear shape along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is inserted.
  • the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.
  • the inner body 200 can take any shape, but is rectangular in the illustrated example. As shown in FIGS. 3 to 5, the inner body 200 comprises a body-side top sheet 30, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. This is the main body part responsible for the absorption function.
  • Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid permeating the top sheet 30 to the absorbent element 50
  • reference numeral 60 denotes an intermediate sheet. 4 shows sit-up gathers 60 extending from both sides of the inner body 200 so as to come in contact with the wearer's legs in order to prevent leakage of excrement to both sides of the inner body 200.
  • the top sheet 30 has the property of being permeable to liquid, and examples thereof include perforated or non-perforated nonwoven fabrics and perforated plastic sheets. Further, the top sheet 30 may be composed of one sheet, or may be composed of a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may consist of one sheet or two or more sheets in the planar direction.
  • Both sides of the top sheet 30 may be folded back to the back side at the side edges of the absorbent element 50, or may protrude laterally beyond the side edges of the absorbent element 50 without being folded.
  • the top sheet 30 can be fixed to a member adjacent to the back side by means of material welding, such as heat sealing or ultrasonic sealing, or hot-melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable.
  • material welding such as heat sealing or ultrasonic sealing, or hot-melt adhesive for the purpose of preventing misalignment with respect to the member on the back side.
  • the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot-melt adhesive applied to its back surface.
  • An intermediate sheet (also called a “second sheet”) 40 having a faster liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated the top sheet 30 to the absorbent body.
  • the intermediate sheet 40 is intended to quickly transfer the liquid to the absorbent body to enhance the absorption performance of the absorbent body and to prevent the phenomenon of "backflow" of the absorbed liquid from the absorbent body.
  • the intermediate sheet 40 can also be omitted.
  • the intermediate sheet 40 examples include materials similar to those of the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, pointbond nonwoven fabric, and crepe paper.
  • an air-through nonwoven fabric is preferred because it is bulky.
  • Composite fibers having a core-sheath structure are preferably used for the air-through nonwoven fabric.
  • the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable.
  • the basis weight is preferably 17-80 g/m 2 , more preferably 25-60 g/m 2 .
  • the thickness of the raw fibers of the nonwoven fabric is preferably 2.0 to 10 dtex.
  • eccentric fibers, hollow fibers, or eccentric and hollow fibers whose core is not in the center as mixed fibers of all or part of the raw material fibers.
  • the intermediate sheet 40 in the illustrated example is shorter than the width of the absorbent body 56 and arranged in the center, but it may be provided over the entire width.
  • the length of the intermediate sheet 40 in the front-rear direction may be the same as the full length of the diaper, the length of the absorbent element 50, or within a short length range centered on the liquid-receiving area.
  • the intermediate sheet 40 can be fixed to a member adjacent to the back side by means of material welding, such as heat sealing or ultrasonic sealing, or hot-melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable.
  • the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot-melt adhesive applied to its back surface.
  • liquid-impermeable sheet 11 The material of the liquid-impermeable sheet 11 is not particularly limited, but examples thereof include plastic films made of olefin resins such as polyethylene and polypropylene, laminated nonwoven fabrics in which a plastic film is provided on the surface of nonwoven fabrics, and plastic films. A laminated sheet in which a nonwoven fabric or the like is laminated and joined to the sheet can be exemplified.
  • plastic films made of olefin resins such as polyethylene and polypropylene
  • laminated nonwoven fabrics in which a plastic film is provided on the surface of nonwoven fabrics, and plastic films.
  • a laminated sheet in which a nonwoven fabric or the like is laminated and joined to the sheet can be exemplified.
  • the liquid-impermeable sheet 11 it is preferable to use a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness.
  • Moisture-permeable plastic films include microporous plastic films obtained by kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching the sheet in a uniaxial or biaxial direction. is widely used.
  • Other methods include non-woven fabrics using microdenier fibers, leak-proof enhancement by reducing fiber voids by applying heat and pressure, and coating with superabsorbent or hydrophobic resins or water repellents. Therefore, a sheet made liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11, but sufficient adhesive strength is obtained when bonding with the cover nonwoven fabric 13 described later via a hot-melt adhesive. It is desirable to use a resin film in order to obtain
  • the liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the figure. It can also extend to both sides. It is appropriate that the width of this extended portion is about 5 to 20 mm on each side.
  • the absorbent element 50 has an absorbent body 56 and a wrapping sheet 58 that wraps the entire absorbent body 56 .
  • the absorbent body 56 is obtained by mixing and accumulating pulp fibers and superabsorbent polymer particles.
  • the basis weight of fibers can be, for example, about 100 to 450 g/m 2 .
  • Superabsorbent polymer particles include “powder” in addition to “particles”.
  • the superabsorbent polymer particles those used in this type of disposable diaper can be used as they are.
  • the percentage of particles remaining on the sieve is preferably 30% by weight or less, and the percentage of particles remaining on the sieve after sieving (shaking for 5 minutes) using a 180 ⁇ m standard sieve (JIS Z8801-1: 2006) is 60. % by weight or more is desirable.
  • the material for the superabsorbent polymer particles can be used without any particular limitation, but those with a water absorption of 40 g/g or more are suitable.
  • Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles. and acrylic acid (salt) polymers can be used.
  • the shape of the superabsorbent polymer particles the powder particles that are commonly used are suitable, but other shapes can also be used.
  • the superabsorbent polymer particles those with a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorbent body 56 tends to return to the outside of the absorbent body 56, which is called reversion.
  • the superabsorbent polymer particles those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the absorbent body 56 is bulky, it is possible to effectively suppress the feeling of stickiness after liquid absorption.
  • the basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56 . Therefore, although it cannot be generalized, it can be 50 to 350 g/m 2 . If the basis weight of the polymer is less than 50 g/m 2 , it becomes difficult to secure the absorption capacity. Above 350 g/m 2 , the effect saturates.
  • the ratio of the fibers and the superabsorbent polymer particles in the absorbent body 56 is not particularly limited, but when the fiber:superabsorbent polymer particle weight ratio is 50:50 to 20:80, when compared with the same area and the same absorption amount A thinner absorber 56 is possible.
  • the thickness 56t of the absorber 56 is not particularly limited, but can be 3 to 15 mm.
  • the absorber 56 may extend over both front and rear sides of the crotch portion M so as to include the crotch portion M.
  • the absorbent body 56 preferably extends to the peripheral edge of the inner body 200 or its vicinity in the front-rear direction LD and the width direction WD.
  • the reference numeral 56X indicates the full width of the absorber 56. As shown in FIG.
  • the absorber 56 has a substantially rectangular shape as in the example shown in Fig. 8 .
  • the width of the absorbent body 56 in the crotch portion M can be made narrower than the front and rear sides thereof to form a constricted shape. is.
  • the width n1 of the narrowest portion of the absorbent body 56 in the crotch portion M should be 0.85 times or more the full width 56X of the absorbent body 56. preferable.
  • the crotch portion M means the range in the front-rear direction LD having the constricted portion 56n when the absorbent body 56 has the constricted portion 56n described later.
  • the outer shape in the unfolded state has a constricted portion as in the illustrated example, it means the range in the front-rear direction LD having the constricted portion of the outer shape (between the front exterior body 12F and the rear exterior body 12B in the illustrated example).
  • it when there is no constricted portion, it means a portion located in the center in the front-rear direction LD and the dimension in the front-rear direction LD is 20 to 30% of the total length of the product.
  • the portions extending forward and rearward from the crotch portion M are the front portion and the rear portion.
  • the absorber 56 has elongated low basis weight parts 56L extending in the front-rear direction LD on both sides of the crotch part M in the width direction WD.
  • the low basis weight portion 56L means a portion with a small basis weight, and does not include a portion where the basis weight does not change just by being compressed in the thickness direction like the compressed portion 51 described later.
  • the low basis weight part 56L can be a slit that penetrates in the thickness direction, but if it is a recessed part with a small accumulation amount of pulp fibers and superabsorbent polymer particles as in the illustrated example, it will be easier to secure the absorption amount. preferable.
  • This concave portion may be formed on the surface of the absorber 56 or may be formed on the back surface.
  • the absorbent body 56 is encouraged to bend along the low basis weight portion 56L, and the fit of the absorbent element 50 in the crotch portion M is improved.
  • the total basis weight of pulp fibers and superabsorbent polymer particles in the low basis weight portion 56L should be less than the total basis weight of pulp fibers and superabsorbent polymer particles in portions other than the low basis weight portion 56L, for example, the low basis weight portion 56L. It can be 0.1 to 0.5 times the total basis weight of pulp fibers and superabsorbent polymer particles in the portion other than the above.
  • the low basis weight portion 56L may extend linearly along the front-rear direction LD as long as it has an elongated shape extending in the front-rear direction LD. It can be curved like Further, the front and rear ends of the low basis weight portion 56L can be formed in an appropriate shape. For example, in addition to being linear as in the example shown in FIG. It may have a shape (semi-arcuate, etc.), or may have rounded corners at both ends and a linear shape in the middle (not shown).
  • the width m1 of the low basis weight portion 56L can be determined as appropriate, for example, 0.04 to 0.1 times the width n1 of the narrowest portion of the crotch portion M of the absorbent body 56 (meaning the total width 56X in the case of a rectangle). can do.
  • the width m1 of the low basis weight portion 56L may be constant in its length direction, or may vary.
  • the dimensions and arrangement of the low basis weight portion 56L in the front-rear direction LD can be appropriately determined.
  • the dimension m2 in the front-rear direction LD of the low basis weight portion 56L can be 50 to 120% of the dimension in the front-rear direction LD of the crotch portion M, more preferably 50 to 80%.
  • the low basis weight portion 56L may be within the range of the crotch portion M, or may protrude from the front side, rear side, or both front and rear sides of the crotch portion M.
  • one low basis weight portion 56L is provided on both sides (left and right sides) in the width direction WD of the crotch portion M, three or more such as one added in the center as shown in FIGS.
  • three or more such as one added in the center as shown in FIGS.
  • only two wires may be provided.
  • the compressed portion 51 is compressed in the thickness direction so as to be recessed into the absorbent body 56 from at least one of the front surface and the back surface, and extends at least from the low basis weight portion 56L. It is provided in a grid-like continuous pattern over the entire lateral region SR (see FIG. 8).
  • the pulp fibers and superabsorbent polymer particles are constrained within the unit frame 51f (see FIG. 11) formed by the compressed portions 51, thereby preventing twisting of the absorbent body 56. and cracking can be prevented.
  • the low basis weight portion 56L described above twists and cracks are likely to occur in the portion of the absorbent body 56 located on the side of the low basis weight portion 56L. This can be effectively suppressed by the compressing portion 51 of .
  • the grid-like compressed portion 51 is provided in a grid-like continuous pattern over the entire region SR on the side of the low basis weight portion 56L, it may be provided only in a partial range including the region SR. , may be provided in a continuous pattern throughout the absorbent element 50 as shown.
  • the grid-like compressed portion 51 can be formed by pressing in a grid-like pattern from the front side, the back side, or both the front and back sides by embossing without heating or with heating.
  • the width 51w of the compressed portion 51 (the width of the bottom portion of the concave portion formed in the absorbent element 50) can be determined as appropriate, but normally it is preferably about 1 to 3 mm.
  • the thickness 51t of the compressed portion 51 can be determined as appropriate, it is usually preferably 15 to 35% of the maximum value of the thickness 50t of the absorbent element 50.
  • the shape of the unit frame 51f is not particularly limited, and may be substantially square, substantially rhombic (excluding square), substantially rectangular, substantially square, substantially triangular, or any other polygonal shape. may Moreover, as long as the compressing portion 51 is provided in a grid pattern, the unit frames 51f of different shapes may be included.
  • One preferred pattern of the compression portion 51 is, as shown in FIGS. It is an oblique lattice pattern including second portions 51b extending in a direction inclined 40 to 50° counterclockwise with respect to the direction LD in a plan view.
  • the shape of the unit frame 51f is substantially rhombic.
  • the dimensions of the unit frame 51f can be determined as appropriate, two or more unit frame rows 51L in which complete unit frames 51f are repeated in the front-rear direction LD are provided in the width direction WD on at least a portion of the side of the low basis weight portion 56L.
  • the dimensions are preferred.
  • the absorbent element 50 is excellent in fit and shape retention in the portions lateral to the low basis weight portion 56L. More specifically, the dimension 51x in the width direction WD of the unit frame 51f can be about 15 to 20 mm. Also, the dimension 51y in the front-rear direction LD of the unit frame 51f can be about 15 to 20 mm.
  • the packaging sheet 58 has a bending resistance measured by the 41.5° cantilever method specified in JIS L 1913:2010 of 0.01 to 0.10 mN cm in the longitudinal direction LD and 0.01 to 0 in the width direction WD. .10 mN ⁇ cm non-woven fabric is used.
  • a soft nonwoven fabric By using such a soft nonwoven fabric, it is possible to suppress deterioration in fit of the crotch portion M caused by the grid-like compression portion 51 without impairing the function of the grid-like compression portion 51 to prevent twisting and cracking. Therefore, both the fitting property of the absorbent element 50 and the shape retention property of the absorbent body 56 in the crotch portion M can be achieved. More preferably, the bending resistance of the nonwoven fabric used for the packaging sheet 58 is 0.03 to 0.05 mN ⁇ cm in the longitudinal direction LD and 0.01 to 0.04 mN ⁇ cm in the width direction WD.
  • the nonwoven fabric used for the packaging sheet 58 is not particularly limited, but SMS nonwoven fabric, SSMMS nonwoven fabric, or the like, in which at least one meltblown layer is sandwiched between a pair of front and back spunbond layers, can be preferably used.
  • the fiber material is not particularly limited, and for example, polypropylene fiber, polyethylene/polypropylene bicomponent fiber, and the like can be used.
  • the basis weight of the packaging sheet 58 can be appropriately determined, but is preferably 5 to 40 g/m 2 , particularly 10 to 30 g/m 2 .
  • the packaging sheet 58 When the packaging sheet 58 is easily stretched, it not only facilitates the formation of the compressed portion 51, but also facilitates the maintenance of the compressed portion 51 when the absorbent element 50 is deformed by an external force during wearing. Therefore, the flexibility of the absorbent element 50 is improved without impairing the ability of the grid-shaped compressed portion 51 to prevent twisting and cracking, thereby improving the fit of the absorbent element 50 in the crotch region M. Therefore, the packaging sheet 58 has an elongation rate of 20 to 100%, particularly 40 to 60% in the standard time defined by JIS L 1913:2010 in the front-rear direction LD, and JIS L 1913:2010 in the width direction WD. 20 to 110%, particularly preferably 50 to 70%.
  • the packaging structure of the packaging sheet 58 can be determined as appropriate. It is preferable that the absorbent body 56 is wound in a shape, the front and rear edges thereof protrude from the front and rear of the absorbent body 56, and the overlapping portions of the wound portion and the front and rear protruding portions are joined by a joining means such as hot-melt adhesive or material welding.
  • the shape retention of the absorbent element 50 by the compressed portion 51 depends on the retainability of the compressed portion 51 itself. It depends on the shape retention of 56 itself.
  • the packaging sheet 58 and the absorbent body 56 are adhered to each other by hot-melt adhesives HM1 and HM2
  • the bonding strength between the packaging sheet 58 and the absorbent body 56 and the strength of the bonding between the absorbent body 56 and the absorption body 56 itself increase as the surface area increases due to the formation of the compressed portion 51.
  • more hot melt adhesives HM1 and HM2 are required.
  • the surface of the absorbent body 56 on the side having at least the depression of the compressed portion 51 among the front and back surfaces of the absorbent body 56 and the inner surface of the packaging sheet 58 are 5.0. Bonding is preferably performed via hot-melt adhesives HM1 and HM2 of up to 20.0 g/m 2 , particularly 7.5 to 15.0 g/m 2 .
  • the regions SR lateral to the low basis weight portion 56L are formed on both sides of the surface of the absorbent body 56 in the width direction WD.
  • the amount of hot melt adhesive HM described above can be achieved.
  • FIG. 13 such a structure is obtained by applying the first hot-melt adhesive HM1 on the inner surface of the unfolded packaging sheet 58 over substantially the entire surface facing the absorbent body 56, and then applying the packaging sheet.
  • An absorbent body 56 having a pre-formed low basis weight portion 56L is arranged in the middle portion of the width direction WD of the first hot melt adhesive HM1 at 58, and the back surface of the absorbent body 56 and the packaging sheet 58 are bonded together by the first hot melt adhesive.
  • the protruding portions are folded back onto the surface of the absorbent body 56, and the surface of the absorbent body 56 and the folded portion of the packaging sheet 58 are adhered via the first hot-melt adhesive HM1 and the second hot-melt adhesive HM2.
  • the overlapping portions of the packaging sheet 58 are adhered via the first hot-melt adhesive HM1, and then, as shown in FIG.
  • the rising gathers 60 have rising parts 68 rising from the sides of the inner body 200, and the rising parts 68 come into contact with the range from the groin of the wearer to the buttocks via around the legs to prevent side leakage. It is.
  • the root side portion 60B stands obliquely toward the center in the width direction
  • the tip side portion 60A rises obliquely outward in the width direction from the intermediate portion. It is not limited to this, and can be changed as appropriate, such as standing up on the center side in the width direction as a whole.
  • the illustrated riser gathers 60 are formed by folding a belt-shaped gathers sheet 62 having a length equal to the length of the inner body 200 in the front-rear direction in the width direction WD at the leading end to fold it in two. While overlapping, a plurality of elongated gather elastic members 63 are fixed in a stretched state along the longitudinal direction at intervals in the width direction WD between the folded portions and the sheets in the vicinity thereof.
  • a base end portion of the rising gathers 60 located on the opposite side to the tip end portion (the end portion on the side opposite to the sheet folded portion in the width direction WD) is a root portion 65 fixed to the side portion of the inner body 200.
  • a portion other than the base portion 65 is a main body portion 66 extending from the base portion 65 (a portion on the folded portion side). Further, the body portion 66 has a root side portion 60B extending toward the center in the width direction, and a distal end portion 60A that is folded back at the tip of the root side portion 60B and extends outward in the width direction. Both ends of the main body portion 66 in the front-rear direction are laid down portions 67 fixed to the side surfaces of the top sheet 30 in the laid-down state, while an intermediate portion in the front-rear direction positioned therebetween is not fixed. A gathered elastic member 63 extending in the front-rear direction LD is fixed to at least the tip of the raised portion 68 in a stretched state.
  • the contraction force of the gathering elastic members 63 causes the sit-up portions 68 to come into contact with the skin as indicated by arrows in FIG.
  • the rising portion 68 rises so as to open outward in the width direction in the crotch portion and its vicinity, so that the rising gathers 60 come into contact with the surface around the leg. and the fit improves.
  • the root portion 65 can also be fixed to the front side of the inner body 200 , for example, the surfaces of both sides of the top sheet 30 .
  • the main body portion 66 is curved and consists of a root side portion 60B extending toward the center in the width direction and a distal end portion 60A extending outward in the width direction by folding back at the tip of the root side portion 60B.
  • the tip side portion 60A and the root side portion 60B are joined in the lying down state at the lying portion 67, and the root side portion 60B is joined to the top sheet 30 in the lying down state.
  • At least one of hot-melt adhesives by various application methods and material welding means such as heat sealing and ultrasonic sealing can be used to join the facing surfaces in the lodging portion 67 .
  • the bonding of the root side portion 60B and the top sheet 30 and the bonding of the tip side portion 60A and the root side portion 60B may be performed by the same means or by different means.
  • nonwoven fabric such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), meltblown nonwoven fabric, etc., which is flexible and excellent in uniformity and concealability, is water-repellent with silicone or the like as necessary.
  • a treated material can be preferably used.
  • the fiber weight of the nonwoven fabric is preferably about 10 to 30 g/m 2 .
  • a waterproof film can be interposed between the gathered sheets 62 folded in two.
  • a thread rubber or the like can be used as the gather elastic member 63 .
  • the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex.
  • the elongation rate of the gathered elastic member 63 in the attached state is preferably 150 to 350%, more preferably 200 to 300%.
  • the number of gather elastic members 63 is preferably 2-6, more preferably 3-5.
  • An appropriate interval between the gathered elastic members 63 is 3 to 10 mm. With this configuration, the area in which the gather elastic member 63 is arranged can easily come into contact with the skin.
  • the gather elastic member 63 may be arranged not only on the tip side but also on the root side.
  • hot-melt adhesive and heat sealing by various coating methods, ultrasonic wave bonding, and heat sealing are applied to bond the inner layer and the outer layer of the gathered sheet 62 together and to fix the gathered elastic member 63 sandwiched therebetween.
  • At least one of fixing means by material welding such as a seal can be used. If the inner layer and the outer layer of the gather sheet 62 are entirely adhered together, the flexibility is impaired. Therefore, it is preferable that the gather elastic member 63 is not adhered or adhered weakly except for the adhered portion.
  • the hot-melt adhesive is applied only to the outer peripheral surface of the gathering elastic member 63 by applying means such as a comb gun or a sure wrap nozzle, and the gathering elastic member 63 is sandwiched between the inner layer and the outer layer of the gathering sheet 62 .
  • the gathering elastic member 63 is fixed to the inner layer and the outer layer of the gather sheet 62 and the inner layer and the outer layer of the gather sheet 62 are fixed only by the hot-melt adhesive applied to the outer peripheral surface of the gathering sheet 62.
  • the lodging portion 67 it is possible to use at least one of hot-melt adhesives by various application methods and material welding means such as heat sealing and ultrasonic sealing.
  • side flaps 70 extending to the sides of the absorbent body 56 are provided on both sides of the inner body 200, and the side flaps 70 extend and contract in the front-rear direction. It is preferable that a stretchable region SG is formed.
  • the side flap 70 of the illustrated example includes one or more elongated side elastic members 73 provided along the front-rear direction LD and spaced apart from each other, and a first sheet facing the outside of the side elastic members 73. It has a layer 71 and a second sheet layer 72 facing the inside of the side elastic members 73 .
  • the sheet material forming the first sheet layer 71 and the second sheet layer 72 is not particularly limited, and an appropriate nonwoven fabric such as a nonwoven fabric that can be used for the above-described rising gathers 60 and the above-described exterior bodies 12F and 12B can be selected.
  • the gather sheet 62 of the rising gather 60 is extended to form the first sheet layer 71 and the second sheet layer 72, as will be described later.
  • the front and rear ends of the side flaps 70 coincide with the front and rear ends of the rising gathers 60 (that is, the front and rear ends of the inner body 200 in this case).
  • the side elastic member 73 is also not particularly limited, and an elongated elastic member similar to the gather elastic member 63 described above can be used.
  • the elongation rate of the side elastic members 73 in the attached state is preferably 150 to 350%, more preferably 200 to 270%.
  • the number of side elastic members 73 is preferably 2-16, more preferably 6-10.
  • An appropriate spacing between the side elastic members 73 is 5 to 10 mm.
  • the side elastic members 73 are fixed to the first sheet layer 71 and the second sheet layer 72 .
  • hot-melt adhesive HM by various coating methods, material welding such as heat sealing and ultrasonic sealing, etc. can be used. If the bonding area between the first sheet layer 71 and the second sheet layer 72 is large, the flexibility is impaired. Therefore, it is preferable that the side elastic members 73 are not bonded or are weakly bonded.
  • the hot-melt adhesive HM is applied only to the outer peripheral surface of the side elastic member 73 by applying means such as a comb gun or Surewrap nozzle, and sandwiched between the first sheet layer 71 and the second sheet layer 72,
  • the side elastic member 73 is fixed to the first sheet layer 71 and the second sheet layer 72, and the first sheet layer 71 and the second sheet layer are fixed only by the hot melt adhesive HM applied to the outer peripheral surface of the side elastic member 73. It has a structure to fix between 72.
  • the sheet material forming the first sheet layer 71 and the sheet material forming the second sheet layer 72 are folded back at the side edges of the side flaps 70, and the folded portions are on the back surface of the liquid-impermeable sheet 11. Fixed (bag closed). This fixation can be performed by welding the materials, in addition to the hot-melt adhesive HM as shown in the figure.
  • the side flaps 70 can also be omitted.
  • the exterior bodies 12F and 12B are a rectangular front exterior body 12F that constitutes at least the waist portion of the front body F, and a rectangular body that constitutes at least the waist portion of the back body B.
  • the front armor body 12F and the rear armor body 12B may not be continuous on the crotch side and may be spaced apart in the front-rear direction LD (armor split type), Although not shown, it may be continuous from the front body to the back body (exterior integrated type).
  • the separation distance 12d in the front-rear direction in the two-part exterior type can be set to about 40 to 60% of the total length Y, for example.
  • the lower edges of the front exterior body 12F and the rear exterior body 12B are linear along the width direction WD, but the lower edge of at least one of the front exterior body 12F and the rear exterior body 12B follows the circumference of the leg. It may be curved like this.
  • the inner body 200 is exposed between the front exterior body 12F and the rear exterior body 12B. It is preferable that the back surface of the inner body 200 is provided with the cover nonwoven fabric 13 extending from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200 .
  • the inner surface and outer surface of the cover nonwoven fabric 13 can be adhered to the opposing surfaces via a hot-melt adhesive.
  • the nonwoven fabric used for the cover nonwoven fabric 13 for example, the same material as the material of the exterior bodies 12F and 12B can be appropriately selected.
  • the outer body may be continuous from the front body F to the back body B through the crotch. In this case, the outer body has not only a portion corresponding to the waist region T, but also a portion corresponding to the intermediate region L.
  • the front exterior body 12F and the rear exterior body 12B have a front waist portion and a rear waist portion that constitute a waist region T.
  • the front exterior body 12F and the rear exterior body 12B have the same dimension in the front-rear direction LD, and the front exterior body 12F and the rear exterior body 12B do not have a portion corresponding to the intermediate region L.
  • the rear exterior body 12B is longer in the front-rear dimension than the front exterior body 12F, and the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a torso.
  • a buttock cover portion C extending from the surrounding region T toward the intermediate region L may be provided.
  • the front exterior body 12F may also be provided with a groin cover portion extending from the waist region T toward the intermediate region L side.
  • the exterior bodies 12F and 12B have outer sheet layers and inner sheet layers adjacent to the outer and inner sides of elastic members 16 to 19, respectively, which are joined by hot-melt adhesives, welding, or the like. It is joined by means.
  • the outer sheet layer and the inner sheet layer may be formed from two sheet materials 12S and 12H as shown in the figure, or may be formed from one sheet material.
  • the inner part and the outer part of a single sheet material folded back at the edge of the waist opening WO (which may be the edge on the crotch side)
  • An inner sheet layer and an outer sheet layer are formed, respectively.
  • the illustrated example is the former example, in which the sheet material 12S that forms the outer sheet layer in the lower waist portion wraps around the waist opening WO side of the sheet material 12H that forms the inner sheet layer in the lower waist portion to the inside thereof.
  • the folded portion 12r extends so as to cover the end portion of the interior body 200 on the side of the waist opening WO.
  • the folded portion 12r serves as an inner sheet layer adjacent to the inner side of the elastic member.
  • Elastic members 16 to 19 are incorporated in the outer bodies 12F and 12B in order to improve the fit around the wearer's waist.
  • a region A2 is formed.
  • the exterior bodies 12F and 12B contract with the contraction of the elastic members in the natural length state, and wrinkles or folds are formed. Elongation is possible up to a predetermined elongation rate.
  • the elastic members 16 to 19 in addition to elongated elastic members such as thread rubber (illustrated example), well-known elastic members such as band-like, net-like, and film-like elastic members can be used without particular limitation.
  • synthetic rubber or natural rubber may be used.
  • a plurality of waist elastic members 17 are spaced in the front-rear direction so as to be continuous over the entire width direction WD in the waist portions W of the outer bodies 12F and 12B. It is installed with a gap.
  • one or more of the waist elastic members 17 disposed in the region adjacent to the lower waist portion U may overlap the inner body 200, or may overlap the inner body 200 at the central portion in the width direction. , may be provided on both sides in the width direction.
  • the waist elastic member 17 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber.
  • the cross-sectional area is 0.05 to 1.5 mm 2 , especially 0.1 to 1.0 mm. 2 to 15, preferably 4 to 10, at intervals of 2 to 12 mm, particularly 3 to 7 mm.
  • the ratio is preferably about 150-400%, more preferably about 220-320%.
  • the waist portion W does not need to use elastic members of the same thickness or have the same elongation rate in the front and rear direction LD.
  • a plurality of waist lower elastic members 16 and 19 made of elongated elastic members are attached to the lower waist portions U of the outer bodies 12F and 12B at intervals in the front-rear direction to provide a lower waist elastic region (waist regions with lower elastic members 16, 19) are formed.
  • the lower waist elastic members 16 and 19 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm 2 , especially 0.1 to 1 mm 2 .
  • the elongation rate of the lower waist portion U in the width direction WD is 200 to 350%. In particular, it is preferably about 240 to 300%.
  • the lower waist portion U does not need to use elastic members of the same thickness or the same elongation rate in the front and back direction LD, and the thickness and elongation rate may be partially different.
  • the middle portion in the width direction including part or all of the portion overlapping the absorbent body 56 in the width direction WD is defined as a non-stretchable region A1, and both sides thereof in the width direction are stretchable. It is preferable that this is the area A2 (in the illustrated example, it is the lower waist elastic area).
  • the widthwise dimension of the stretchable regions A2 provided on both widthwise sides of the non-stretchable region A1 may be substantially constant in the front-rear direction LD as in the illustrated example, or may vary in the front-rear direction LD (not shown).
  • the dimensions in the width direction WD of the stretchable regions A2 provided on both sides of the non-stretchable region A1 in the width direction WD may be substantially the same between the front body F and the back body B, or may be different.
  • Such a stretchable region A2 and a non-stretchable region A1 are formed by attaching the elastic members 16 to 17, 19 between the inner sheet layer and the outer sheet layer, and then forming the non-stretchable region A1 in the widthwise middle region.
  • the elastic members 16 and 19 can be finely cut by pressurizing and heating or cutting at points or substantially all over the elastic members 16 and 19, and can be constructed by leaving the stretchability in the stretchable region A2 and eliminating the stretchability in the non-stretchable region A1. .
  • the unnecessary elastic member 18 that does not substantially contribute to the formation of stretchability remains in the non-stretchable region A1.
  • non-woven fabrics are preferable although they can be used without particular limitation.
  • the basis weight per sheet is about 10 to 30 g/m 2 .
  • the elastic members 16-19 can be fixed to the exterior bodies 12F and 12B by a known method.
  • the inner sheet layer and the outer sheet layer can also be joined together by known methods.
  • the hot melt adhesive HM is applied only to the outer peripheral surfaces of the elastic members 16 to 19 by applying means such as a comb gun or Surewrap nozzle to form an inner sheet layer. and the outer sheet layer, fixing the elastic members 16 to 19 to the inner sheet layer and the outer sheet layer, and fixing the elastic members 16 to 19 to the inner sheet layer and the inner
  • the fixing of the sheet layer and the outer sheet layer can be performed.
  • Fixing of the inner body 200 to the outer bodies 12F and 12B can be performed by means of material welding such as heat sealing or ultrasonic sealing, or hot melt adhesive.
  • material welding such as heat sealing or ultrasonic sealing, or hot melt adhesive.
  • the hot-melt adhesive applied to the back surface of the inner body 200 that is, the back surface of the liquid-impermeable sheet 11 and the base portion 65 of the rising gather 60 in this case, is applied to the inner surfaces of the exterior bodies 12F and 12B. is fixed.
  • the inner/outer joints 20 for fixing the inner body 200 and the outer bodies 12F and 12B can be provided in substantially the entire area where the two overlap. It can also be provided in the removed part.
  • ⁇ "Front-back direction means the direction (longitudinal direction) indicated by symbol LD in the figure
  • "width direction” means the direction (left-right direction) indicated by WD in the figure. are orthogonal.
  • Elongation rate means a value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.
  • Methodsuke is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23 ⁇ 1° C., relative humidity 50 ⁇ 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant weight in an environment at a temperature of 100°C. Fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a sampling template (100 mm x 100 mm), a sample with dimensions of 100 mm x 100 mm is cut from the constant weight specimen. The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as basis weight.
  • the “thickness” of thick members such as the absorbent body 56, the absorbent element 50, and the compressed portion 51 is measured by Ozaki Manufacturing Co., Ltd.’s thickness measuring instrument (Peacock, dial thickness gauge, model H (measurement range 0 to 10 mm, measurement area diameter 10 mm circular terminal, measuring force of about 1.7 N, pressure of about 21.7 KPa)), the sample and the thickness measuring instrument are placed horizontally, and the thickness is measured.
  • ⁇ The “thickness” of thick members such as the absorbent body 56, the absorbent element 50, and the compressed portion 51 is measured by Ozaki Manufacturing Co., Ltd.’s thickness measuring instrument (Peacock, dial thickness gauge, model H (measurement range 0 to 10 mm, measurement area diameter 10 mm circular terminal, measuring force of about 1.7 N, pressure of about 21.7 KPa)
  • the “thickness” of thin sheets such as non-woven fabric is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of a load of 0.098 N/cm 2 and a pressurized area of 2 cm 2 . do.
  • KS-G5 handy compression measurement program automatic thickness measuring device
  • the water absorption rate is the "time to end point" when JIS K7224-1996 "Test method for water absorption rate of superabsorbent resin" is performed using 2g of superabsorbent polymer and 50g of physiological saline. .
  • the "deployed state” means a flat state without contraction (including any contraction such as contraction due to elastic members) or slack.
  • the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.
  • test and measurement shall be performed in a laboratory or equipment under standard conditions (test location: temperature 23 ⁇ 1°C, relative humidity 50 ⁇ 2%). do.
  • the present invention is suitable for underpants-type disposable diapers because it is particularly important to solve the above-mentioned problems, but it can be used for disposable diapers in general, such as tape-type disposable diapers and pad-type disposable diapers.
  • Second sheet layer 73 Side elastic member A1... Non-stretchable area A2... Stretchable area B... Back body C... Buttock cover part F... Front body HM... Hot melt adhesive L... Intermediate area LD... Forward and backward direction LO... Leg opening M... Crotch area SG... Side elastic area SR... Side T: waist region, U: lower waist portion, W: waist portion, WD: width direction, WO: waist opening, HM1: first hot-melt adhesive, HM2: second hot-melt adhesive.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
PCT/JP2022/010689 2021-06-14 2022-03-10 使い捨ておむつ Ceased WO2022264558A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP22824558.5A EP4356891A4 (en) 2021-06-14 2022-03-10 DISPOSABLE DIAPER
CN202280032919.1A CN117241769A (zh) 2021-06-14 2022-03-10 一次性尿布
BR112023016995A BR112023016995A2 (pt) 2021-06-14 2022-03-10 Fralda descartável

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JP2021098758A JP7476139B2 (ja) 2021-06-14 2021-06-14 使い捨ておむつ
JP2021-098758 2021-06-14

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TW (1) TWI885247B (https=)
WO (1) WO2022264558A1 (https=)

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JP2024124805A (ja) * 2023-03-03 2024-09-13 大王製紙株式会社 吸収性物品

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013000238A (ja) * 2011-06-14 2013-01-07 Kao Corp 吸収性物品
JP2018000525A (ja) * 2016-06-30 2018-01-11 ユニ・チャーム株式会社 吸収性物品
JP2021000236A (ja) 2019-06-20 2021-01-07 ユニ・チャーム株式会社 吸収性物品、吸収体の製造方法、及び吸収体の製造装置
JP2021062176A (ja) * 2019-10-17 2021-04-22 花王株式会社 吸収性物品
JP2021062175A (ja) * 2019-10-17 2021-04-22 花王株式会社 吸収性物品

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JP6183806B2 (ja) * 2013-12-20 2017-08-23 花王株式会社 使い捨ておむつ
JP6198076B2 (ja) * 2015-09-25 2017-09-20 大王製紙株式会社 吸収性物品
JP6952016B2 (ja) * 2018-06-29 2021-10-20 ユニ・チャーム株式会社 吸収性物品

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2013000238A (ja) * 2011-06-14 2013-01-07 Kao Corp 吸収性物品
JP2018000525A (ja) * 2016-06-30 2018-01-11 ユニ・チャーム株式会社 吸収性物品
JP2021000236A (ja) 2019-06-20 2021-01-07 ユニ・チャーム株式会社 吸収性物品、吸収体の製造方法、及び吸収体の製造装置
JP2021062176A (ja) * 2019-10-17 2021-04-22 花王株式会社 吸収性物品
JP2021062175A (ja) * 2019-10-17 2021-04-22 花王株式会社 吸収性物品

Non-Patent Citations (1)

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Title
See also references of EP4356891A4

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BR112023016995A2 (pt) 2023-12-26
CN117241769A (zh) 2023-12-15
JP7476139B2 (ja) 2024-04-30
EP4356891A4 (en) 2025-06-11
EP4356891A1 (en) 2024-04-24
TW202247828A (zh) 2022-12-16
TWI885247B (zh) 2025-06-01
JP2022190435A (ja) 2022-12-26

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