WO2022264558A1 - 使い捨ておむつ - Google Patents
使い捨ておむつ Download PDFInfo
- 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
Links
- 230000002745 absorbent Effects 0.000 claims abstract description 148
- 239000002250 absorbent Substances 0.000 claims abstract description 148
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 59
- 239000000835 fiber Substances 0.000 claims abstract description 47
- 238000004806 packaging method and process Methods 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000005452 bending Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000004831 Hot glue Substances 0.000 claims description 47
- 229920000247 superabsorbent polymer Polymers 0.000 claims description 25
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- 239000006096 absorbing agent Substances 0.000 claims description 15
- 230000014759 maintenance of location Effects 0.000 abstract description 17
- 229920000642 polymer Polymers 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 30
- 238000010521 absorption reaction Methods 0.000 description 22
- 238000007789 sealing Methods 0.000 description 18
- 230000000630 rising effect Effects 0.000 description 17
- 210000002414 leg Anatomy 0.000 description 14
- 238000003466 welding Methods 0.000 description 13
- 238000000576 coating method Methods 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- -1 polyethylene Polymers 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 238000005304 joining Methods 0.000 description 8
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- 239000002985 plastic film Substances 0.000 description 7
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- 239000000470 constituent Substances 0.000 description 6
- 230000008602 contraction Effects 0.000 description 6
- 229920006255 plastic film Polymers 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 5
- 239000005871 repellent Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000005060 rubber Substances 0.000 description 4
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- 244000043261 Hevea brasiliensis Species 0.000 description 3
- 210000001217 buttock Anatomy 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229920003052 natural elastomer Polymers 0.000 description 3
- 229920001194 natural rubber Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 239000012945 sealing adhesive Substances 0.000 description 3
- 229920003051 synthetic elastomer Polymers 0.000 description 3
- 239000005061 synthetic rubber Substances 0.000 description 3
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
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- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004750 melt-blown nonwoven Substances 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 210000002700 urine Anatomy 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 241000692870 Inachis io Species 0.000 description 1
- 229920002334 Spandex Polymers 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- LLSDKQJKOVVTOJ-UHFFFAOYSA-L calcium chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Ca+2] LLSDKQJKOVVTOJ-UHFFFAOYSA-L 0.000 description 1
- 229940052299 calcium chloride dihydrate Drugs 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 229920003174 cellulose-based polymer Polymers 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000009459 flexible packaging Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 1
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- 229920003179 starch-based polymer Polymers 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
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Images
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
- A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers 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
- 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
- A61F13/534—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.
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Abstract
Description
<第1の態様>
股間部と、前記股間部より前側及び後側にそれぞれ延びた前側部分及び後側部分とを有しており、
前記股間部を含む前後方向範囲に設けられた吸収体、及びこの吸収体を包む包装シートを有する吸収要素を備え、
前記吸収体は、パルプ繊維及び高吸収性ポリマー粒子を混合・集積してなるものであり、
前記吸収体は、前記股間部における幅方向両側に、前後方向に延びた細長状の低目付け部を有し、
前記吸収要素の表面及び裏面の少なくとも一方から前記吸収体内まで窪むように厚み方向に圧縮された圧縮部が、前記吸収要素における少なくとも前記低目付け部より側方の領域の全体にわたり格子状に連続するパターンで設けられており、
前記包装シートは、JIS L 1913:2010に規定される41.5°カンチレバー法による剛軟度が、前後方向で0.01~0.10mN・cm、かつ幅方向で0.01~0.10mN・cmの不織布である、
ことを特徴とする使い捨ておむつ。
本使い捨ておむつの特徴は、(ア)低目付け部を設けることにより低目付け部に沿う吸収体の屈曲を促して股間部における吸収要素のフィット性を向上させ、(イ)低目付け部に起因して発生しやすくなる、吸収体のうち低目付け部の側方に位置する部分のヨレや割れを、低目付け部の側方全体にわたる格子状圧縮部により抑制し、(ウ)格子状圧縮部に起因する股間部のフィット性の低下を、格子状圧縮部によるヨレ・割れの防止機能を損ねずに、柔軟な包装シートの採用により抑制するところにある。したがって、本使い捨ておむつによれば、従来よりも、股間部における、吸収要素のフィット性及び吸収体の形状維持性の両立を図ることができる。
前記吸収体は、前記股間部における最も狭い部分の幅が、前側部分及び後側部分における全幅の0.85~1倍である、
第1の態様の使い捨ておむつ。
股間部におけるフィット性を改善するための手法としては、股間部における吸収体の幅をその前後両側よりも狭くし、括れ形状とすることも知られている。しかし、この場合、股間部における吸収量の低下は避けられない。一方、括れを有しない又は括れの小さいの吸収体の場合、吸収量は確保しやすくなるが、股間部におけるフィット性が低下するだけでなく、両脚の動きの力を受けやすくなり、形状維持性が低下しやすい。しかし、後者の場合に、前述の低目付け部、格子状圧縮部、柔軟な不織布からなる包装シートの組み合わせを採用すると、股間部の吸収量を確保しつつ、股間部における吸収要素のフィット性及び股間部の形状維持性の両立を図ることができる。なお、特許文献1記載の吸収体は、股間部における最も狭い部分の幅が、前側部分及び後側部分における全幅の約0.79倍である。
前記吸収体における前記パルプ繊維の目付けが100~450g/m2であり、
前記吸収体におけるパルプ繊維:高吸収性ポリマー粒子が、重量比で50:50~20:80であり、
第1又は2の態様の使い捨ておむつ。
本態様のように高吸収性ポリマー粒子の含有率が高い吸収体は吸収量の確保及び逆戻りの防止の観点から好ましいものであるが、吸収体における低目付け部より側方の部分のヨレや割れが発生しやすい。しかし、このような高吸収性ポリマー粒子の含有率が高い吸収体の場合に、前述の低目付け部、格子状圧縮部、柔軟な不織布からなる包装シートの組み合わせを採用すると、全体としての吸収量及び逆戻り防止性を高めつつ、股間部における吸収要素のフィット性及び股間部の形状維持性の両立を図ることができる。
前記圧縮部の幅1~3mmであり、前記圧縮部の厚みは前記吸収要素の厚みの最大値の15~35%であり、
前記圧縮部は、前後方向に対して平面視で時計回りに40~50°傾斜した第1部分と、前後方向に対して平面視で反時計回りに40~50°傾斜した第2部分とからなる斜め格子状に形成されており、
前記低目付け部より側方の少なくとも一部に、前記圧縮部からなる単位枠が前後方向に繰り返す単位枠列が幅方向に2列以上設けられている、
第3の態様の使い捨ておむつ。
圧縮部の寸法、形状は適宜定めることができるが、本態様のように構成されていると好ましい。特に圧縮部の単位枠の列が幅方向に2列以上設けられていることにより、低目付け部より側方の部分における吸収要素のフィット性及び形状維持性に優れたものとなる。
少なくとも前記低目付け部より側方の領域の全体にわたり、前記吸収体の表面及び裏面のうち少なくとも前記圧縮部の窪みを有する側の面と、前記包装シートの内面とが、5.0~20.0g/m2のホットメルト接着剤を介して接着されている、
第4の態様の使い捨ておむつ。
圧縮部による吸収要素の形状維持性は、圧縮部自体の維持性により左右され、圧縮部自体の維持性は圧縮部における包装シートと吸収体との接合強度や吸収体自体の形状維持性により左右される。そして、圧縮部形成による表面積増加に伴い、包装シートと吸収体との接合強度や吸収体自体の形状維持性を十分に維持するためには、通常より多くのホットメルト接着剤が必要となる。よって、本態様のように、単に包装シートの内面と吸収体の外面とをホットメルト接着剤により接着するだけでなく、少なくとも低目付け部より側方の領域の全体にわたり、吸収体の表面及び裏面のうち少なくとも圧縮部の窪みを有する側の面と包装シートの内面とを接着するホットメルト接着剤の量を十分多量にするのは好ましい。
前記包装シートは、前後方向における、JIS L 1913:2010に規定される標準時の伸び率が20~100%であり、
幅方向における、JIS L 1913:2010に規定される標準時の伸び率が20~110%である、
第1~5のいずれか1つの態様の使い捨ておむつ。
包装シートが本態様の程度の伸びやすさを有することにより、格子状の圧縮部によるヨレや割れの防止性能を損ねることなく、吸収要素の柔軟性が向上し、もって股間部における吸収要素のフィット性が向上する。
内装体200は任意の形状を採ることができるが、図示例では長方形である。内装体200は、図3~図5に示されるように、身体側となるトップシート30と、液不透過性シート11と、これらの間に介在された吸収要素50とを備えているものであり、吸収機能を担う本体部である。符号40は、トップシート30を透過した液を速やかに吸収要素50へ移行させるために、トップシート30と吸収要素50との間に設けられた中間シート(セカンドシート)を示しており、符号60は、内装体200の両脇に排泄物が漏れるのを防止するために、内装体200の両側部から着用者の脚周りに接するように延び出た起き上がりギャザー60を示している。
トップシート30は、液を透過する性質を有するものであり、例えば、有孔又は無孔の不織布や、有孔プラスチックシートなどを例示することができる。また、トップシート30は、1枚のシートからなるものであっても、2枚以上のシートを貼り合せて得た積層シートからなるものであってもよい。同様に、トップシート30は、平面方向に関して、1枚のシートからなるものであっても、2枚以上のシートからなるものであってもよい。
トップシート30を透過した液を速やかに吸収体へ移行させるために、トップシート30より液の透過速度が速い、中間シート(「セカンドシート」とも呼ばれている)40を設けることができる。この中間シート40は、液を速やかに吸収体へ移行させて吸収体による吸収性能を高め、吸収した液の吸収体からの「逆戻り」現象を防止するためのものである。中間シート40は省略することもできる。
液不透過性シート11の素材は、特に限定されるものではないが、例えば、ポリエチレンやポリプロピレン等のオレフィン系樹脂等からなるプラスチックフィルムや、不織布の表面にプラスチックフィルムを設けたラミネート不織布、プラスチックフィルムに不織布等を重ねて接合した積層シートなどを例示することができる。液不透過性シート11には、ムレ防止の観点から好まれて使用されている液不透過性かつ透湿性を有する素材を用いることが好ましい。透湿性を有するプラスチックフィルムとしては、ポリエチレンやポリプロピレン等のオレフィン系樹脂中に無機充填剤を混練して、シートを成形した後、一軸又は二軸方向に延伸して得られた微多孔性プラスチックフィルムが広く用いられている。この他にも、マイクロデニール繊維を用いた不織布、熱や圧力をかけることで繊維の空隙を小さくすることによる防漏性強化、高吸水性樹脂又は疎水性樹脂や撥水剤の塗工といった方法により、プラスチックフィルムを用いずに液不透過性としたシートも、液不透過性シート11として用いることができるが、後述するカバー不織布13とのホットメルト接着剤を介した接着時に十分な接着強度を得るため、樹脂フィルムを用いるのが望ましい。
吸収要素50は、吸収体56と、この吸収体56の全体を包む包装シート58とを有する。
吸収体56は、パルプ繊維及び高吸収性ポリマー粒子を混合・集積したものである。繊維目付けとしては、例えば100~450g/m2程度とすることができる。
吸収体56は、股間部Mにおける幅方向WD両側に、前後方向LDに延びた細長状の低目付け部56Lを有している。低目付け部56Lは、目付けが少ない部分を意味し、後述する圧縮部51のように厚み方向に圧縮されているだけで目付けは変化しない部分を含まない。低目付け部56Lは、厚み方向に貫通するスリットとすることもできるが、図示例のようにパルプ繊維及び高吸収性ポリマー粒子の集積量の少ない凹部であると、吸収量を確保しやすくなるため好ましい。この凹部は、吸収体56の表面に形成されていても、裏面に形成されていてもよい。吸収体56にこのような低目付け部56Lを設けることにより低目付け部56Lに沿う吸収体56の屈曲を促して股間部Mにおける吸収要素50のフィット性が向上する。低目付け部56Lにおけるパルプ繊維及び高吸収性ポリマー粒子の総目付量は、低目付け部56L以外の部分におけるパルプ繊維及び高吸収性ポリマー粒子の総目付量より少なければよく、例えば、低目付け部56L以外の部分におけるパルプ繊維及び高吸収性ポリマー粒子の総目付量の0.1~0.5倍とすることができる。
吸収要素50においては、図3、図4、図9に示すように、表面及び裏面の少なくとも一方から吸収体56内まで窪むように厚み方向に圧縮された圧縮部51が、少なくとも低目付け部56Lより側方の領域SR(図8参照)全体にわたり格子状に連続するパターンで設けられている。このような格子状の圧縮部51が設けられていると、パルプ繊維及び高吸収性ポリマー粒子が圧縮部51からなる単位枠51f(図11参照)内に拘束されるため、吸収体56のヨレや割れを防止することができる。特に、前述の低目付け部56Lを有する場合、吸収体56のうち低目付け部56Lの側方に位置する部分にヨレや割れが発生しやすくなるが、低目付け部56Lの側方全体にわたる格子状の圧縮部51によりこれを効果的に抑制することができる。
包装シート58としては、JIS L 1913:2010に規定される41.5°カンチレバー法による剛軟度が前後方向LDで0.01~0.10mN・cm、かつ幅方向WDで0.01~0.10mN・cmの不織布を用いる。このような柔軟な不織布を用いることにより、格子状圧縮部51に起因する股間部Mのフィット性の低下を、格子状圧縮部51によるヨレ・割れの防止機能を損ねずに抑制することができ、もって、股間部Mにおける、吸収要素50のフィット性及び吸収体56の形状維持性の両立を図ることができる。包装シート58に用いる不織布の剛軟度が前後方向LDで0.03~0.05mN・cm、かつ幅方向WDで0.01~0.04mN・cmであるとより好ましい。
起き上がりギャザー60は、内装体200の側部から起き上がる起き上がり部分68を有しており、この起き上がり部分68が、着用者の鼠径部から脚周りを経て臀部までの範囲に接して横漏れを防止するものである。図示例の起き上がりギャザー60は、付け根側部分60Bが幅方向中央側に向かって斜めに起立し、中間部より先端側部分60Aが幅方向外側に向かって斜めに起立するものであるが、これに限定されるものではなく、全体として幅方向中央側に起立するもの等、適宜の変更が可能である。
図1~図4等に示すように、内装体200の両側部には、吸収体56の側方に延び出たサイドフラップ70が設けられており、このサイドフラップ70に前後方向に伸縮するサイド伸縮領域SGが形成されていると好ましい。図示例のサイドフラップ70は、前後方向LDに沿ってかつ互いに間隔を空けて設けられた一本又は複数本の細長状のサイド弾性部材73と、サイド弾性部材73の外側に面する第1シート層71と、サイド弾性部材73の内側に面する第2シート層72とを有する。
外装体12F,12Bは、図示例のように、前身頃Fの少なくとも胴周り部を構成する部分である長方形の前外装体12Fと、後身頃Bの少なくとも胴周り部を構成する部分である長方形の後外装体12Bとからなり、前外装体12F及び後外装体12Bは股間側で連続しておらず、前後方向LDに離間されたものとなっていても(外装二分割タイプ)よいし、図示しないが前身頃から後身頃まで連続していても(外装一体タイプ)よい。外装二分割タイプにおける前後方向の離間距離12dは例えば全長Yの40~60%程度とすることができる。図示例では、前外装体12F及び後外装体12Bの下縁は幅方向WDに沿う直線状となっているが、前外装体12F及び後外装体12Bの少なくとも一方の下縁が脚周りに沿うような曲線状となっていてもよい。
内装体200の外装体12F,12Bに対する固定は、ヒートシール、超音波シールのような素材溶着による接合手段や、ホットメルト接着剤により行うことができる。図示例では、内装体200の裏面、つまりこの場合は液不透過性シート11の裏面及び起き上がりギャザー60の付根部分65に塗布されたホットメルト接着剤を介して外装体12F,12Bの内面に対して固定されている。この内装体200と外装体12F,12Bとを固定する内外接合部20は、図2に示すように、両者が重なる領域のほぼ全体に設けることができ、例えば内装体200の幅方向両端部を除いた部分に設けることもできる。
明細書中の以下の用語は、明細書中に特に記載が無い限り、以下の意味を有するものである。
Claims (6)
- 股間部と、前記股間部より前側及び後側にそれぞれ延びた前側部分及び後側部分とを有しており、
前記股間部を含む前後方向範囲に設けられた吸収体、及びこの吸収体を包む包装シートを有する吸収要素を備え、
前記吸収体は、パルプ繊維及び高吸収性ポリマー粒子を混合・集積してなるものであり、
前記吸収体は、前記股間部における幅方向両側に、前後方向に延びた細長状の低目付け部を有し、
前記吸収要素の表面及び裏面の少なくとも一方から前記吸収体内まで窪むように厚み方向に圧縮された圧縮部が、前記吸収要素における少なくとも前記低目付け部より側方の領域の全体にわたり格子状に連続するパターンで設けられており、
前記包装シートは、JIS L 1913:2010に規定される41.5°カンチレバー法による剛軟度が前後方向で0.01~0.10mN・cm、かつ幅方向で0.01~0.10mN・cmの不織布である、
ことを特徴とする使い捨ておむつ。 - 前記吸収体は、前記股間部における最も狭い部分の幅が、前側部分及び後側部分における全幅の0.85~1倍である、
請求項1記載の使い捨ておむつ。 - 前記吸収体における前記パルプ繊維の目付けが100~450g/m2であり、
前記吸収体におけるパルプ繊維:高吸収性ポリマー粒子が、重量比で50:50~20:80であり、
請求項1又は2記載の使い捨ておむつ。 - 前記圧縮部の幅1~3mmであり、前記圧縮部の厚みは前記吸収要素の厚みの最大値の15~35%であり、
前記圧縮部は、前後方向に対して平面視で時計回りに40~50°傾斜した第1部分と、前後方向に対して平面視で反時計回りに40~50°傾斜した第2部分とからなる斜め格子状に形成されており、
前記低目付け部より側方の少なくとも一部に、前記圧縮部からなる単位枠が前後方向に繰り返す単位枠列が幅方向に2列以上設けられている、
請求項3記載の使い捨ておむつ。 - 少なくとも前記低目付け部より側方の領域の全体にわたり、前記吸収体の表面及び裏面のうち少なくとも前記圧縮部の窪みを有する側の面と、前記包装シートの内面とが、5.0~20.0g/m2のホットメルト接着剤を介して接着されている、
請求項4記載の使い捨ておむつ。 - 前記包装シートは、前後方向における、JIS L 1913:2010に規定される標準時の伸び率が20~100%であり、
幅方向における、JIS L 1913:2010に規定される標準時の伸び率が50~110%である、
請求項1~5のいずれか1項に記載の使い捨ておむつ。
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