WO2015146452A1 - 吸収性物品の製造方法及び吸収性物品 - Google Patents
吸収性物品の製造方法及び吸収性物品 Download PDFInfo
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- WO2015146452A1 WO2015146452A1 PCT/JP2015/055560 JP2015055560W WO2015146452A1 WO 2015146452 A1 WO2015146452 A1 WO 2015146452A1 JP 2015055560 W JP2015055560 W JP 2015055560W WO 2015146452 A1 WO2015146452 A1 WO 2015146452A1
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- sheet
- extruded
- joint
- adjacent
- ridges
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
-
- 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
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15699—Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
-
- 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
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
- A61F13/49007—Form-fitting, self-adjusting disposable diapers
- A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
- A61F13/49011—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/5116—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers
-
- 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
- A61F13/537—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53743—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
-
- 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
- A61F13/56—Supporting or fastening means
- A61F13/5622—Supporting or fastening means specially adapted for diapers or the like
- A61F13/5633—Supporting or fastening means specially adapted for diapers or the like open type diaper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
-
- 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
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
- A61F2013/15715—Shaping or making outer layers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/5116—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers
- A61F2013/51182—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers with non-continuous bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4871—Underwear
- B29L2031/4878—Diapers, napkins
Definitions
- the present invention relates to an absorbent article including a disposable diaper and a sanitary napkin.
- This type of absorbent article includes an absorbent body and a liquid-permeable top sheet that covers the front side of the absorbent body, and excreted liquid such as urine and menstrual blood passes through the top sheet and is absorbed by the absorbent body.
- excreted liquid such as urine and menstrual blood
- a surface sheet for absorbent articles non-woven fabrics by various production methods, those perforated as a secondary process, porous films made of a synthetic resin such as polyethylene, and the like have been used.
- a second sheet made of a bulky nonwoven fabric is bonded to the back surface of the top sheet.
- -Absorbent articles are required not only to prevent leakage of excrement such as urine but also to prevent discomfort and rash caused by the excretion of excrement such as urine on the skin. Therefore, in recent years, when a nonwoven fabric is used for the top sheet, for example, as shown in Patent Documents 1 to 3, a large number of dome-shaped extruded bulges are formed on the top sheet by embossing, and the contact between the top sheet and the skin is achieved. It is also practiced to reduce the area and to make the portion in contact with the skin flexible.
- the form in which the second sheet is joined to the periphery of the protruding bulge in the top sheet (the bottom of the depression between the bulged portions) and the second sheet is formed, and the distribution process Even if it is in a pressurized state in the packaging bag until it is used after being used, it is very preferable because the extruded bulge is firmly maintained and has excellent absorbency as well as excellent appearance.
- the embossed top sheet is not only highly functional, but also makes consumers feel functional beauty, and is an extremely important factor in terms of appearance.
- Such joining of the top sheet and the second sheet can be manufactured by, for example, a three-roll type processing facility shown in FIG. That is, the processing equipment for the top sheet includes a pressing roll 90 in which a large number of pressing convex portions 90a are arranged on the peripheral surface, and the concave portion 91a and the concave portion 91a that are opposed to the pressing roll 90 and correspond to the pressing convex portion 90a.
- a concave roll 91 having a provided bonding convex portion 91 b and a bonding roll 92 facing the concave roll 91 are provided.
- the top sheet material 30S is fed with a certain amount of tension by the draw from the downstream side, and is first sandwiched between the push roll 90 and the concave roll 91, and the convex portion of the push roll 90 faces the concave portion 91a of the concave roll 91.
- protruding raised portions 31 are formed by entering, and then wound on the concave roll 91 and guided by the rotation of the concave roll 91, on the outside of the top sheet material 30 ⁇ / b> S, also downstream
- the second sheet material 40S is fed with a certain amount of tension by drawing from the side, and the top sheet material 30S and the second sheet material 40S are sandwiched between the joining rolls 92 and the concave roll 91 is joined.
- the top / second joint 80 is formed by thermocompression bonding between the portion 91b and the outer peripheral surface of the joining roll 92. It is.
- the main problem of the present invention is to prevent the occurrence of wrinkles in the MD direction in the top sheet while joining the top sheet and the second sheet having the extruded raised portions.
- the present inventor has conducted earnest research on the above-described wrinkles, and found that wrinkles generated in the top sheet are generated so as to pass through the center of the ridges aligned in the MD direction in the CD direction.
- By forming a dot-like top-second joint at the center position in the CD direction corresponding to the center portion in the CD direction of the adjacent extruding ridge portion between the portions the remainder of the top sheet can be eliminated.
- the present invention has been made by searching for the cause. That is, the present invention that has solved the above problems is as follows.
- An absorbent body a liquid-permeable top sheet made of a nonwoven fabric covering the front side of the absorbent body, and a second sheet bonded to the back surface of the top sheet,
- a plurality of extruded ridges extruded from the back side to the front side are arranged at intervals in the width direction and the front-rear direction, respectively.
- Between the extruded ridges adjacent to each other in the width direction and the front-rear direction in the top sheet are joined to the second sheet, and a number of top-second joint portions are formed in an intermittent joining pattern in the width direction and the front-rear direction.
- the manufacturing method of the absorbent article In assembling the top sheet and the second sheet, After forming the extruded raised portion by embossing while transferring the nonwoven fabric to be the top sheet by drawing from the downstream side, The material of the second sheet is aligned with the back surface of the nonwoven fabric on which the extruded ridges are formed, and between the extruded ridges adjacent in the MD direction, the CD central position corresponding to the CD central portion of the adjacent extruded ridges and The top second joint is formed in a side pattern on both sides in the CD direction of the central position, and the top second joint is continuously or stepwise from the central position toward the side. In the joining pattern in which the MD direction joining range by is widened, the material of the nonwoven fabric and the second sheet are joined.
- the manufacturing method of the absorbent article characterized by the above-mentioned.
- ⁇ Invention of Claim 2> The top and second joints between the extruding ridges adjacent to each other in the MD direction continuously extend from the center position to both sides in the CD direction, and the length in the MD direction becomes longer continuously or stepwise toward the side.
- the manufacturing method of the absorbent article of Claim 1 which is an integral junction part which becomes.
- the “joint pattern in which the MD direction joint range by the top / second joint portion is widened in a continuous or stepwise manner from the central position to the side” is formed by a plurality of top / second joint portions separated from each other.
- the effect of preventing wrinkles is excellent.
- the top and second joint portions are provided at the central position and the lateral position so as to be separated from each other, and the number of the top and second joint portions in the MD direction or
- the “joining pattern in which the MD direction joining range by the top / second joint portion is widened in a continuous or stepwise manner from the central position to the side” is formed by the integrated pattern as described above. Permeability and flexibility may be reduced, but if formed by a plurality of top-second joints separated from each other as described in this section, such a risk can be reduced, and a wrinkle prevention effect is also achieved. It can be fully demonstrated.
- a pressing roll in which a large number of pressing protrusions are formed on the peripheral surface in the arrangement pattern of the protruding ridges, a depression corresponding to the pressing roll and corresponding to the pressing protrusion, and a bonding protrusion provided between the depressions.
- the material of the second sheet is sent to the outside of the nonwoven fabric serving as the top sheet by drawing from the downstream side, and the nonwoven fabric serving as the top sheet and the material of the second sheet are Between the concave roll and the joining roll, the top second joint portion is formed by thermocompression bonding between the joint convex portion of the concave roll and the peripheral surface of the joining roll.
- the present invention is preferably applied to such a manufacturing method.
- An absorbent body a liquid-permeable top sheet made of a nonwoven fabric covering the front side of the absorbent body, and a second sheet bonded to the back surface of the top sheet,
- a plurality of extruded ridges extruded from the back side to the front side are arranged at intervals in the width direction and the front-rear direction, respectively.
- Between the extruded ridges adjacent to each other in the width direction and the front-rear direction in the top sheet are joined to the second sheet, and a number of top-second joint portions are formed in an intermittent joining pattern in the width direction and the front-rear direction.
- top sheet and the second sheet are joint patterns in which the top / second joint portion is formed, and the joint direction has a MD-direction joint range that increases continuously or stepwise from the central position toward the side.
- An absorbent article characterized by the above.
- MD direction and CD direction in the absorbent article mean “MD direction” and “CD direction” of the processing equipment of the extruded ridges, and either one is the front-rear direction, The other is the width direction.
- MD direction in a product is a fiber orientation direction of the nonwoven fabric of a top sheet.
- the fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned.
- the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, It can be discriminated by a simple measuring method for determining the orientation direction.
- the top and second joints between the extruding ridges adjacent to each other in the MD direction have a length in the MD direction of 0.1 to 1 times the center distance in the MD direction of the CD direction row of the extruding ridges adjacent to the MD direction.
- the length in the CD direction is a joint having a horizontally long shape that is 0.3 to 1 times the center distance in the CD direction of the MD direction row of the extruded ridges adjacent to each other in the CD direction.
- the dimension of the integral joint is not particularly limited, but is preferably within the range described in this section.
- the top and second joint portions are provided at the central position and the lateral position so as to be separated from each other, and the number of the top and second joint portions in the MD direction or
- the absorptive article according to claim 5 whose length becomes large or long continuously or stepwise as it goes to the side from said central position.
- Each top second joint between the extruding ridges adjacent to each other in the MD direction has an MD direction length of 0.1 to 0 of the center distance in the MD direction of the CD direction row of the extruding ridges adjacent to the MD direction. 10.
- a point-like joint having a length of 4 times and a length in the CD direction of 0.1 to 0.4 times the center distance in the CD direction of the MD direction row of the extruded ridges adjacent in the CD direction.
- the CD direction joining range by the top and second joints between the extruded ridges adjacent to each other in the MD direction is 0.3 to 1 times the center distance in the CD direction of the MD direction row of the extruded ridges adjacent to the CD direction.
- the MD direction joining range by the top and second joints between the extruded ridges adjacent to each other in the CD direction is 0.3 to 1 times the center distance in the MD direction of the CD direction row of the extruded ridges adjacent to the MD direction.
- the MD sheet can be prevented from generating wrinkles in the MD direction. .
- FIG. 6 is a sectional view taken along line 6-6 of FIG.
- FIG. 7 is a sectional view taken along line 7-7 in FIG.
- FIG. 8 is a sectional view taken along line 8-8 in FIG.
- FIG. 9 is a sectional view taken along line 9-9 in FIG.
- FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a top view of a top sheet and a second sheet. It is an enlarged plan view of the joining pattern of the top / second joining part.
- FIGS. 1 to 6 show an example of a tape-type disposable diaper.
- symbol X indicates the full width of the diaper excluding the fastening tape
- symbol L indicates the total length of the diaper.
- Each component is fixed or bonded in the same manner as a known diaper, if necessary, other than the fixed or bonded portion described below.
- a hot melt adhesive or welding heat welding, ultrasonic welding
- This tape-type disposable diaper is a portion that extends from the lower abdomen along the center in the width direction through the crotch to cover the buttocks, and a liquid-permeable top sheet that forms the body side surface, and the outer surface side
- An absorbent main body 10 that is a part where the absorbent element 50 is interposed between the liquid-impermeable sheet located in the liquid-impervious sheet, and a part that extends to the front side and the rear side of the absorbent main body part 10 respectively, and It has a ventral end flap portion EF and a dorsal end flap portion EF which are portions that do not have the absorbent element 50.
- this tape-type disposable diaper has a pair of side flap portions SF, SF extending laterally from the side edge of the absorbent main body portion 10, and the side flap portions SF, SF on the back side have a pair of side flap portions SF, SF.
- Fastening tapes 13 are respectively provided.
- the entire outer surface of the absorbent main body 10 and the side flaps SF, SF is formed by the exterior sheet 12.
- a liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot-melt adhesive, and an absorbent element is further disposed on the inner surface side of the liquid-impermeable sheet 11.
- 50, the second sheet 40, and the top sheet 30 are laminated in this order.
- the top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction and the width direction than the absorbent element 50, and are eaten from the side edges of the absorbent element 50 in the top sheet 30.
- the peripheral edge that protrudes and the peripheral edge that protrudes from the side edge of the absorbent element 50 in the liquid-impermeable sheet 11 are fixed by a hot melt adhesive or the like.
- the liquid-impermeable sheet 11 is made of a moisture-permeable polyethylene film or the like and is formed to be slightly wider than the top sheet 30.
- side solid gathers 60, 60 that protrude (stand up) toward the wearer's skin are provided, and the gather sheets that form the side solid gathers 60, 60 are provided.
- 62 and 62 are fixed in a range from the both side portions of the top sheet 30 to the inner surfaces of the side flap portions SF and SF.
- the exterior sheet 12 is a part that supports the absorbent element 50 and is attached to the wearer.
- the exterior sheet 12 has an hourglass shape in which the center part in the front-rear direction on both sides is constricted, and this is a part that surrounds the wearer's leg.
- the exterior sheet 12 is preferably a non-woven fabric, but is not limited thereto.
- the type of the nonwoven fabric is not particularly limited, and as the material fiber, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton are used.
- a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used.
- a long-fiber nonwoven fabric such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric is preferable in that both the touch and strength can be achieved.
- the nonwoven fabrics are preferably bonded to each other with a hot melt adhesive or the like.
- the fiber basis weight is desirably 10 to 50 g / m 2 , particularly 15 to 30 g / m 2 .
- liquid-impermeable sheet 11 The material of the liquid-impermeable sheet 11 is not particularly limited.
- the liquid-impermeable sheet 11 is substantially made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film.
- Non-woven fabrics that ensure liquid impermeability in this case, liquid impervious sheets are composed of waterproof films and non-woven fabrics).
- a liquid-impermeable and moisture-permeable material that has been used and used in recent years from the viewpoint of preventing stuffiness can also be exemplified.
- an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction.
- an olefin resin such as polyethylene or polypropylene
- the microporous sheet obtained in this way can be given.
- a sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.
- the top sheet 30 uses a porous or non-porous nonwoven fabric having liquid permeability.
- the nonwoven fabric is not particularly limited as to what the raw fiber is.
- synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated.
- the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method.
- the spun lace method is a preferable processing method for obtaining flexibility and drapeability
- the thermal bond method is for obtaining bulkiness and softness.
- the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.
- the second sheet 40 is joined to the back surface of the top sheet 30 in order to quickly move the excreted liquid that has passed through the top sheet 30 to the absorber 56 side and to prevent reversal.
- the material of the second sheet 40 preferably has the same melting point as the top sheet 30.
- a non-woven fabric can be used, and a resin film having a large number of transmission holes can also be used.
- the non-woven fabric the same material as that described in the section of the top sheet 30 can be used, but those having higher hydrophilicity than the top sheet 30 and those having a higher fiber density are changed from the top sheet 30 to the second sheet 40. This is preferable because of its excellent liquid transfer characteristics.
- the second sheet 40 in the form shown in the figure is arranged in the center shorter than the width of the absorbent element 50, but may be provided over the entire width.
- the length of the second sheet 40 in the front-rear direction may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.
- the side three-dimensional gather 60 includes a gather sheet 62 that is substantially continuous in the width direction, and an elongated elastic elastic member 63 that is fixed to the gather sheet 62 in a stretched state along the front-rear direction.
- a gather sheet 62 a water-repellent nonwoven fabric can be used, and as the elastic elastic member 63, rubber thread or the like can be used.
- a plurality of elastic elastic members can be provided in addition to a plurality of elastic expansion members.
- the inner surface of the gather sheet 62 has a fixing start end in the width direction on the side portion of the top sheet 30, and a portion on the outer side in the width direction from the fixing start end is on the side portion of the liquid-impermeable sheet 11 and the outer side in the width direction. It fixes to the side part of the exterior sheet
- the width direction inner side from the fixing start end of the side three-dimensional gather 60 is fixed on the top sheet 30 at both ends in the product front-rear direction, but the portion between them is an unfixed free part.
- the portion comes to stand by the contraction force of the elastic elastic member 63.
- the diaper is mounted, the diaper is mounted on the body in the shape of a boat, and since the contraction force of the elastic expansion / contraction member 63 acts, the side three-dimensional gather 60 stands up by the contraction force of the elastic expansion / contraction member 63 and around the leg. In close contact. As a result, so-called side leakage from around the legs is prevented.
- the front and rear direction end portions of the gather sheet 62 on the inner side in the width direction are divided into a base end side portion extending inward in the width direction from an outer portion in the width direction and a center side in the width direction of the base end side portion. It is also possible to fix in a double-folded state having a distal end side portion that is folded back from the edge toward the body side and extends outward in the width direction, and the portion in between can be an unfixed free portion.
- each side flap portion SF, SF has a gap between the gather sheet 62 and the liquid-impermeable sheet 11 on the outer side in the width direction in the vicinity of the fixing start end of the fixing portion of the gather sheet 62.
- a leg elastic elastic member 64 made of rubber thread or the like is fixed in a stretched state along the front-rear direction, whereby the leg peripheral portions of the side flap portions SF, SF are configured as a flat gather.
- the leg elastic member 64 may be disposed between the liquid-impermeable sheet 11 and the exterior sheet 12 in the side flap portion SF. In addition to providing a plurality of leg elastic members 64 on each side as shown in the drawing, only one elastic member 64 can be provided on each side.
- the absorption element 50 is a part that absorbs and holds liquid such as urine and loose stool.
- the absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps at least the back and side surfaces of the absorbent body 56.
- the packaging sheet 58 can be omitted.
- the absorbent element 50 can be adhered to the inner surface of the liquid-impermeable sheet 11 via an adhesive such as a hot melt adhesive on the back surface.
- the absorber 56 can be formed of an aggregate of fibers.
- This fiber assembly a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used.
- the fiber basis weight can be, for example, about 100 to 300 g / m 2 when stacking cotton-like pulp or short fibers, and about 30 to 120 g / m 2 for filament aggregates, for example. Can do.
- the fineness in the case of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex.
- the filament may be a non-crimped fiber, but is preferably a crimped fiber.
- the crimped degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used.
- the absorbent body 56 preferably includes superabsorbent polymer particles.
- the superabsorbent polymer particles are dispersed substantially throughout the thickness direction with respect to the aggregate of fibers. Is desirable.
- “distributed in the entire thickness direction” means “distributed unevenly in the upper part, the lower part, and / or the middle part of the aggregate of fibers in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. Further, a form in which some SAP particles do not enter the fiber assembly and remain on the surface thereof, and a form in which some SAP particles pass through the fiber assembly and are on the packaging sheet 58 are also excluded. It is not something.
- the superabsorbent polymer particles include “powder” in addition to “particles”.
- particle diameter of the superabsorbent polymer particles those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 ⁇ m or less, particularly 150 to 400 ⁇ m are desirable.
- the material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable.
- Superabsorbent polymer particles include starch, cellulose and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link. Or an acrylic acid (salt) polymer can be used.
- shape of the superabsorbent polymer particles a commonly used granular material is suitable, but other shapes can also be used.
- the superabsorbent polymer particles those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.
- the basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m 2 . If the amount of polymer is less than 50 g / m 2, it is difficult to secure the absorption amount. When it exceeds 350 g / m 2 , not only the effect is saturated, but also the sensation of incongruity due to the excess of superabsorbent polymer particles is given.
- tissue paper particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like
- tissue paper particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like
- the superabsorbent polymer particles be a sheet that does not escape.
- a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material.
- the fiber basis weight is preferably 5 to 40 g / m 2 , particularly 10 to 30 g / m 2 .
- the packaging sheet 58 may wrap only the back surface and side surfaces of the layer in addition to the form of wrapping the entire absorbent body 56.
- the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric
- the lower surface is covered with a liquid-impermeable sheet such as polyethylene
- the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric.
- the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the packaging sheet).
- the absorbent body 56 may be sandwiched between two upper and lower sheets or disposed only on the lower surface, but this is not desirable because it is difficult to prevent the movement of the superabsorbent polymer particles.
- the fastening tape 13 includes a sheet base material that forms a tape attachment portion 13 ⁇ / b> C fixed to a side portion of the diaper and a tape main body portion 13 ⁇ / b> B protruding from the tape attachment portion 13 ⁇ / b> C. And a locking portion 13A for the abdomen side provided at the intermediate portion in the width direction of the tape main body portion 13B in the sheet base material, and the tip side from this locking portion 13A is a knob.
- the tape attachment portion 13C of the fastening tape 13 is sandwiched between the gather sheet 62 forming the inner layer and the exterior sheet 12 forming the outer layer in the side flap portion, and is bonded to both the sheets 62 and 12 by a hot melt adhesive. . Moreover, 13 A of latching parts are joined to the sheet
- the length X1 of the diaper in the width direction is preferably 10 to 50 mm, particularly 20 to 40 mm, and the length Y1 in the front-rear direction is 20 to 100 mm, particularly It is preferably 40 to 80 mm.
- the length in the width direction of the diaper is preferably 30 to 80 mm, particularly preferably 40 to 60 mm, and the length (height) in the front-rear direction is 20 to 70 mm, particularly 25 to 50 mm is preferred.
- the fastening tape 13 when a part or all of the fastening tape 13 has a substantially tapered shape, for example, and the length in the front-rear direction and the length in the width direction are not constant, the numerical range is determined by an average value.
- the fastening tape 13 may have a symmetrical shape such as a rectangular shape.
- the fastening tape 13 is a convex shape composed of a wide attachment portion and an elongated tip side portion, the grip portion on the tip side portion can be easily picked and This is preferable because the tension between the bases of this region acts over a wide range.
- a hook material male material of a mechanical fastener (surface fastener) is suitable.
- the hook material has a large number of engaging projections on the outer surface side thereof.
- the shape of the engaging protrusion is (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped (J-shaped And the like may be any shape.
- an adhesive layer can also be provided as a locking portion of the fastening tape 13.
- a non-woven fabric, a plastic film, a polylaminated non-woven fabric, paper or a composite material thereof can be used, but the fineness is 1.0 to 3.5 dtex, and the basis weight.
- a spunbonded nonwoven fabric, air-through nonwoven fabric, or spunlace nonwoven fabric having a thickness of 20 to 100 g / m 2 and a thickness of 1 mm or less is preferred.
- the fastening tape When installing the diaper, the fastening tape is locked in place on the outer surface of the abdominal side F with the back side flap portion SF superimposed on the outside of the abdominal side flap portion SF.
- the position and size of the fastening portion of the fastening tape 13 can be arbitrarily determined.
- the locking location is a rectangular range of 20 to 80 mm in the front-rear direction and 150 to 300 mm in the width direction, and the distance in the height direction between the upper edge and the ventral upper edge is 0 to 60 mm, particularly 20 to 50 mm. And the center in the width direction of the product.
- the fastening tape 13 When the fastening tape 13 is attached so that the tape attachment portion 13C of the fastening tape 13 overlaps the boundary line between the back end flap portion EF and the absorbing element 50, the fastening tape 13 is placed between the attachment portions of the left and right fastening tapes 13 when the diaper is attached. This is preferable because the back end portion of the absorbent element 50 is firmly pressed against the body by the tension acting on the body. Moreover, if the attachment part of the fastening tape 13 is too far from the back side end part (rear end part) of the diaper, the tension acting between the tape attachment parts 13C of the left and right fastening tapes 13 when the diaper is mounted is on the back side of the diaper.
- the length in the front-rear direction of the back end flap portion EF is preferably the same as or shorter than the length in the front-rear direction of the tape attachment portion 13 ⁇ / b> C of the fastening tape 13.
- target sheet It is preferable to provide a target sheet 12T having a target for facilitating the locking at the locking position of the fastening tape 13 on the ventral side F.
- a target sheet 12T when the hook portion is the hook material 13A, a target sheet 12T can be used in which a large number of loop yarns are formed on the surface of a sheet base material made of a plastic film or nonwoven fabric so that the hook material engagement protrusions are entangled.
- an adhesive material layer a sheet base material made of a plastic film having a smooth surface that is rich in adhesiveness can be used.
- the fastening portion of the fastening tape 13 on the ventral side F is made of a nonwoven fabric
- the exterior sheet 12 of the illustrated form is made of a nonwoven fabric and the fastening portion of the fastening tape 13 is a hook material 13A
- the target sheet 12T can be omitted, and the hook material 13A can be entangled with the nonwoven fabric of the exterior sheet 12 and locked.
- the target sheet 12T may be provided between the exterior sheet 12 and the liquid-impermeable sheet 11.
- End flap The end flap portions EF are portions that extend to the front side and the rear side of the absorbent main body portion 10 respectively, and are portions that do not have the absorbent element 50, and the front side extension portion is a ventral end flap portion EF. Yes, the rear extension part is the back end flap part EF.
- the length in the front-rear direction of the back end flap EF is preferably the same as or shorter than the length in the front-rear direction of the attachment portion of the fastening tape 13 for the reason described above. If it is too close, a gap is likely to occur between the back end of the diaper and the body surface due to the thickness and stiffness of the absorbent element 50, so that it is preferably 10 mm or more.
- the length in the front-rear direction of the ventral end flap part EF and the back end flap part EF is preferably about 5 to 20% of the length L in the front-rear direction of the entire diaper.
- a thickness of 20 to 50 mm is appropriate.
- a belt-like back-side stretchable waist sheet 70 that elastically stretches in the width direction is provided between both fastening tapes 13 to improve the fit in the back side of the diaper.
- Both end portions of the back-side elastic waist sheet 70 are preferably extended to a portion that overlaps with the attachment portions of both fastening tapes 13, but may be spaced apart in the center in the width direction.
- the back-and-forth stretchable waist sheet 70 has a front-rear direction dimension that is generally the same as the front-rear direction dimension of the fastening tape 13 mounting portion, but may have a dimensional difference of about ⁇ 20%.
- the back elastic waist sheet 70 may use a sheet-like elastic member such as a rubber sheet, but it is preferable to use a nonwoven fabric or paper from the viewpoint of air permeability. In this case, a sheet-like elastic member having air permeability such as a stretchable nonwoven fabric can be used. However, as shown in FIG. 5, the sheet base material 71 such as two nonwoven fabrics is bonded with an adhesive such as a hot melt adhesive.
- the elastic stretch member 72 such as a perforated sheet, net, or elongated (thread-like or string-like) or the like is fixed in a stretched state in the width direction between the sheet base materials 71 while being laminated.
- the sheet base 71 in this case, the same one as the exterior sheet 12 can be used.
- the elongation rate of the elastic elastic member 72 is preferably about 150 to 250%. Further, when an elongated member (thread-like or string-like) is used as the elastic elastic member 72, it is preferable to provide about 5 to 15 members with a thickness of 420 to 1120 dtex at intervals 72d of 3 to 10 mm.
- a part of the elastic expansion / contraction member 72 is arranged so as to cross the absorbent element 50 as shown in the figure because the fitting property of the absorption element 50 is improved, but in this case, the elastic expansion / contraction member 72 is used. If the contraction force is prevented from acting on a part or all of the overlapping portion by means such as cutting, the back end of the absorbent element 50 does not contract in the width direction, so that the fit is further improved.
- the elastic elastic member 72 may be fixed over the entire length of the sheet base material 71 in the longitudinal direction of the sheet (width direction of the diaper), but in order to prevent the sheet from shrinking or curling when attached to the diaper body, In the range of about 5 to 20 mm at the end in the front-rear direction (diaper width direction), it is preferable that the contraction force does not work or the elastic elastic member 72 does not exist.
- the back-side stretchable waist sheet 70 is sandwiched between the gather sheet 62 and the exterior sheet 12 on both sides in the width direction of the liquid-impermeable sheet 11 and overlaps with the liquid-impermeable sheet 11.
- the impermeable sheet 11 and the absorbent element 50 it may be provided between the liquid impermeable sheet 11 and the exterior sheet 12 or provided on the outer surface of the exterior sheet 12.
- it may be provided between the top sheet 30 and the absorbent element 50.
- the back-side elastic waist sheet 70 may be provided on the top sheet 30, and in this case, the back-side elastic waist sheet 70 may be provided on the gather sheet 62 on both sides in the width direction of the liquid-impermeable sheet 11.
- the entire back-side stretchable waist sheet 70 may be provided between the sheet base materials of the exterior sheet 12.
- Extruded ridge of top sheet A large number of extruded raised portions 31 that are extruded from the back side to the front side by embossing are arranged on the top sheet 30 at intervals in the width direction and the front-rear direction.
- the arrangement pattern may be a matrix as shown in FIGS. 8 and 9, or a staggered pattern (arranged in adjacent rows) as shown in FIG.
- the dimensions and the like of the extruded ridge 31 can be determined as appropriate. As shown in FIGS. 8 to 11, the dimension 31m in the MD direction of the extruded ridge 31 is the top of the extruded ridge 31 positioned on one side in the MD direction.
- the center distance between the second joint 80 (described later) and the top-second joint 80 located on the other side is 80y or less, and the lower limit is preferably about 0.9 times. It is preferably about 9 mm.
- the CD dimension 31c of the extruding ridge 31 is not more than the center interval 80x between the top / second junction 80 located on one side of the extruding ridge 31 in the CD direction and the top / second junction 80 located on the other side.
- the lower limit is preferably about 0.9 times, and is preferably about 2.7 to 9 mm for infants.
- the height 31z of the extruded raised portion 31 is preferably about 0.8 to 2 mm in the case of infant use.
- MD direction and CD direction in the product mean “MD direction” and “CD direction” of the processing equipment of the extruded protrusion 31, and either one is the front-rear direction, The other is the width direction.
- the MD direction in the product is the fiber orientation direction of the nonwoven fabric of the top sheet 30.
- the fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned.
- the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, It can be discriminated by a simple measuring method for determining the orientation direction.
- the front-rear direction is the MD direction and the width direction is the CD direction, as in most products of absorbent articles.
- the arrangement interval of the extruded ridges 31 can be determined as appropriate, in the case of an infant, in the case of a matrix arrangement as shown in FIGS. 8 and 9, the CD direction of the MD direction row of the extruded ridges 31 adjacent to the CD direction.
- the center interval 31x is preferably about 3 to 10 mm
- the MD direction center interval 31y of the CD direction row of the extruded ridges 31 adjacent in the MD direction is preferably about 3 to 10 mm.
- the CD direction center interval 31x in the MD direction row of the extruded ridges 31 adjacent in the CD direction is about 3 to 10 mm
- the CD of the extruded ridges 31 adjacent in the MD direction is preferably about 3 to 10 mm.
- the shape of the extruded raised portion 31 is preferably a circular dome shape, but may be an elliptical dome shape or a regular polygon dome shape.
- the extrusion protruding part 31 is a part formed by extruding the top sheet 30 by embossing, a desired shape can be obtained by appropriately changing the shape of the convex part used for the process.
- top / second joint As shown in FIGS. 9 and 10, the portion of the top sheet 30 between the protruding ridges 31 adjacent to each other in the width direction and the front-rear direction is joined to the second sheet 40 to intermittently move in the width direction and the front-rear direction.
- a number of top and second junctions 80 are formed in a typical junction pattern. Characteristically, the joining pattern of the top sheet 30 and the second sheet 40 is such that, between the extruded ridges 31 adjacent in the MD direction, the center in the CD direction corresponding to the central portion in the CD direction of the adjacent extruded ridges 31.
- FIG. 13 shows a sample photograph of the assembly of the top sheet 30 and the second sheet 40 that employs the pattern shown in FIG.
- the ridges can be extended to both sides in the CD direction to be eliminated or unnoticeable without breaking the shape of the extruded raised portion 31 when joining to the second sheet 40.
- the comparative sample having the top-second joint portion 80 that does not satisfy the above conditions a large number of wrinkles along the MD direction are formed at intervals in the CD direction, which deteriorates the appearance.
- the length of the shortest part A1 in the MD direction joining range and the length of the longest part A2 in the MD direction joining range may be appropriately determined, but the longest part A2 is about 1.1 to 2 times the shortest part A1. It is preferable that
- the degree of change in the MD direction joining ranges A1 and A2 may be determined as appropriate.
- the center (the center in the MD direction and the CD direction) of the extruded ridge 31 is set as the center CP.
- Extrusion ridge adjacent to the MD direction on or outside the virtual arc CL passing through the intersection point XP of the virtual center line VL along the MD direction passing through and the proximal edge NE of the top-second joint 80 It is preferable to set the top / second joint portion 80 between the portions 31 so that the shape of the extruded raised portion 31 can be a large round shape (circular or square with rounded corners).
- the top-second joint 80 between the extruding ridges 31 adjacent to each other in the CD direction is also arranged so that its proximal edge is located on the virtual arc CL or on the outside of the virtual arc CL. It is desirable.
- the top second joint 80 between the extruded ridges 31 adjacent in the MD direction and the top second between the extruded ridges 31 adjacent in the CD direction At least one of the joints 80 can also be positioned.
- the wrinkle prevention pattern is not particularly limited.
- the top-second joint portion 80 between the extruding ridges 31 adjacent to each other in the MD direction is positioned at the center position. It can be formed by integrally extending the length in the CD direction on both sides and continuously (or stepwise) increasing in the MD direction as it goes to the side. Although the change in the length in the MD direction can be gradual, it is preferable to form a continuous joint as a whole as shown in the figure.
- the wrinkle prevention pattern formed by the integrated top / second joint 80 is superior to the wrinkle prevention pattern formed by a plurality of top / second joints 80 that are separated from each other as will be described later.
- the size and shape of the integrated top / second joint 80 in this wrinkle prevention pattern can be determined as appropriate, but the MD length of the top / second joint 80 between the extruded ridges 31 adjacent in the MD direction is 80 m. Is approximately 0.1 to 1 times the MD center interval 31y in the CD direction row of the extruded ridges 31 adjacent in the MD direction (for example, 0.5 to 10 mm in the case of infants), and the CD direction length 80c is The laterally long shape in the CD direction is about 0.3 to 1 times (for example, 1 to 10 mm in the case of infants) of the CD direction center interval 31x in the MD direction row of the extruded ridges 31 adjacent to the CD direction. Is preferred.
- the wrinkle prevention pattern has the top and second joint portions 80 at the central position and the lateral position between the extruded ridges 31 adjacent in the MD direction. They can also be formed by being provided so as to be spaced apart from each other and by increasing the number of top-second joints 80 in the MD direction stepwise from the central position toward the side. Although not shown, instead of changing the number in the MD direction, the length of the top / second junction 80 can be changed, and the change can be continuous. In the case of the wrinkle-preventing pattern by the above-mentioned integrated top / second joint 80, the permeability and flexibility of the top sheet 30 may be reduced, but by the plurality of top / second joints 80 spaced apart from each other. The wrinkle prevention pattern can reduce such a fear, and can also fully exhibit the wrinkle prevention effect.
- the size and shape of the anti-wrinkle pattern having a plurality of top-second joints 80 that are spaced apart from each other can be determined as appropriate, but each top-second joint 80 between the extruded ridges 31 adjacent in the MD direction is
- the MD direction length of 80 m is about 0.1 to 0.4 times the MD direction center interval 31y of the CD direction row of the extruded ridges 31 adjacent to the MD direction (for example, 0.5 to 3 mm for infants).
- the CD direction length 80c is 0.1 to 0.4 times the CD direction center interval 31x in the MD direction row of the protruding ridges 31 adjacent in the CD direction (for example, 0.5 to 3 mm in the case of infant use) It is preferably a point-like joint.
- the distance between the extruded ridges 31 adjacent in the CD direction is also between the extruded ridges 31 adjacent in the MD direction.
- the top / second joints 80 between the extruded ridges 31 are arranged in a matrix, as shown in FIG.
- the top / second joints 80 are also intermittently provided in the MD direction between the extruded ridges 31 adjacent in the CD direction.
- the pattern of the top / second junction 80 is not particularly limited, but it is preferable to arrange the dotted top / second junctions 80 at intervals in the front-rear direction.
- the MD rows of the top-second joints 80 may be provided in one row at an intermediate position between the extruding ridges 31 adjacent to each other in the CD direction as in the illustrated example, or a plurality of rows may be provided at intervals in the CD direction.
- the size of the dotted top-second joint 80 is not particularly limited, but the MD direction length 80 m is 0.1 of the MD center interval 31 y in the CD direction row of the extruded ridges 31 adjacent in the MD direction.
- the CD direction length 80c is about 0.4 to 0.4 times (in the case of infant use, for example, 0.5 to 3 mm), and the CD direction center interval 31x of the MD direction row of the extruded ridges 31 adjacent in the CD direction is 0. It is preferably about 1 to 0.4 times (in the case of infant use, for example, 0.5 to 3 mm).
- the top-second joint portion 80 is formed in an intermittent joint pattern in the width direction and the front-rear direction, and the interval in each direction can be determined as appropriate. For example, each of the top-second joint portions 80 between the extruding ridge portions 31 adjacent to each other in the MD direction.
- the CD direction joining range A3 by the top / second joint 80 is 0.3 to 1 times the CD center distance 31x in the MD direction row of the protruding ridges 31 adjacent in the CD direction (for example, 1 to 10 mm in the case of infants)
- the MD direction joining range A4 by the top-second joints 80 between the protruding ridges 31 adjacent in the CD direction is preferably in the CD direction row of the protruding ridges 31 adjacent in the MD direction.
- the top-second bonding portion 80 is not different from being continuous in the CD direction and the MD direction, and the permeability and flexibility of the top sheet 30 may be reduced. There is.
- FIG. 12 shows processing equipment for the top sheet 30 and the second sheet 40 for manufacturing the above-mentioned disposable diaper. That is, this equipment includes a pressing roll 90 in which a large number of pressing protrusions 90a are formed on the peripheral surface in the arrangement pattern of the protruding protrusions 31, and a depression corresponding to the pressing protrusion 90a. 91a, and a concave roll 91 having a joint convex portion 91b provided in the above-described arrangement of the top and second joint portions 80 between the concave portions 91a, and a joining roll 92 facing the concave roll 91.
- the shape of the convex part of the pushing roll 90 can be determined as appropriate, it has a truncated truncated cone shape having a cross section (for example, a circle, an ellipse, a regular polygon, etc.) that matches the shape of the extruded raised part 31 to be formed.
- the concave portion 91a of the concave roll 91 may be an “open hole” that does not have a bottom surface, so long as the raised portion is formed, and the “concave portion 91a” in the present invention is also an “open hole”. Including meaning.
- the size and shape of the extruded raised portion 31 formed by the push roll 90 and the concave roll 91 substantially correspond to the push convex portion and the concave portion 91a as shown by a two-dot chain line in FIGS.
- the nonwoven fabric 30S to be the top sheet 30 is transferred by a draw from the downstream side, sandwiched between the pressing roll 90 and the concave roll 91, and the embossing for pressing the convex portion of the pressing roll 90 into the concave portion 91a of the concave roll 91.
- the extruded raised portion 31 is formed by processing.
- the material 40S of the second sheet 40 is drawn on the outside of the nonwoven fabric to be the top sheet 30 by drawing from the downstream side.
- the nonwoven fabric 30 ⁇ / b> S to be the top sheet 30 and the material 40 ⁇ / b> S of the second sheet 40 are sandwiched between the concave roll 91 and the joining roll 92, and thermocompression bonding is performed between the joining convex portion 91 b of the concave roll 91 and the peripheral surface of the joining roll 92.
- the top / second joint portion 80 having the joint pattern described above is formed, and the assembly of the top sheet 30 and the second sheet 40 is manufactured. Since the bonding pattern is as described above, a description thereof is omitted here.
- the joining means in addition to thermocompression bonding, adhesion by heat sealing or hot melt adhesive can be employed.
- the assembled assembly of the processed top sheet 30 and second sheet 40 can be used to manufacture a disposable diaper by assembling it with an absorbent body or the like according to a known method.
- the above-described top-second joining is performed. It is preferable to employ the bonding pattern of the portion 80. Of course, as long as the top-second joint portion 80 is formed after the extruded raised portion 31 is formed by embossing, the above-described three-roll processing facility is not necessary.
- the nonwoven fabric to be the top sheet 30 is fed directly to the position where the push roll 90 and the concave roll 91 mesh with each other, but only the push roll 90 is wound from the tangential direction of the peripheral surface of the push roll 90.
- the nonwoven fabric to be the top sheet 30 may be fed to the concave roll 91 and then guided to be transferred to the peripheral surface of the concave roll 91.
- the basis weight of a sheet such as a nonwoven fabric is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ⁇ 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%.
- a sample with a size of 200 mm ⁇ 250 mm ( ⁇ 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm ⁇ 250 mm, ⁇ 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
- the thickness is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 10 gf / cm 2 and pressure area: 2 cm 2 .
- “Longitudinal direction (vertical direction)” means the direction connecting the ventral side (front side) and dorsal side (rear side), and “width direction” means the direction orthogonal to the front-rear direction (lateral direction).
- the “up and down direction” means a wearing state of the diaper, that is, a direction perpendicular to the width direction when the diaper is folded in two at the crotch portion so that the abdomen and back portions of the diaper are overlapped.
- Elongation rate means a value when the natural length is 100%.
- test and measurement shall be performed in a standard room (test location is temperature 20 ⁇ 5 ° C., relative humidity 65% or less) in a test room or apparatus.
- A1, A2 ... MD direction joining range 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12T ... Target sheet, 13 ... Fastening tape, 13A ... Locking part, 13B ... Tape body part, 13C ... Tape attachment part, DESCRIPTION OF SYMBOLS 30 ... Top sheet, 31 ... Extrusion bulge part, 40 ... Second sheet, 50 ... Absorption element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Side solid gather, 62 ... Gather sheet, 70 ... Back side expansion waist sheet , 80... Top / second joint, 90... Push roll, 90 a... Push convex, 91 .. concave roll, 91 a.
Abstract
Description
吸収体と、この吸収体の表側を被覆する不織布からなる液透過性トップシートと、トップシートの裏面に貼り合わされたセカンドシートと、を備えており、
前記トップシートに、裏側から表側に押し出されてなる押し出し隆起部が、幅方向及び前後方向にそれぞれ間隔を空けて多数配列されており、
前記トップシートにおける、幅方向及び前後方向に隣接する押し出し隆起部の間がセカンドシートと接合されて、幅方向及び前後方向に間欠的な接合パターンで多数のトップ・セカンド接合部が形成されている、吸収性物品の製造方法において、
前記トップシート及びセカンドシートを組み立てるにあたり、
前記トップシートとなる不織布を下流側からのドローにより移送しつつエンボス加工により前記押し出し隆起部を形成した後、
この押し出し隆起部を形成した不織布の裏面に前記セカンドシートの素材を合わせ、MD方向に隣接する押し出し隆起部の間では、当該隣接する押し出し隆起部のCD方向中央部と対応するCD方向中央位置及びこの中央位置のCD方向両側の側方位置に前記トップ・セカンド接合部が形成される接合パターンであって、かつ前記中央位置から側方に向かうにつれて連続的又は段階的に前記トップ・セカンド接合部によるMD方向接合範囲が広くなる接合パターンで、前記不織布及びセカンドシートの素材を接合する、
ことを特徴とする吸収性物品の製造方法。
MD方向に隣接する押し出し隆起部の間では、当該隣接する押し出し隆起部のCD方向中央部と対応するCD方向中央位置だけでなく、この中央位置のCD方向両側の側方位置にもトップ・セカンド接合部を形成し、さらに中央位置から側方に向かうにつれて連続的又は段階的にトップ・セカンド接合部によるMD方向接合範囲が広くなる接合パターンで、不織布及びセカンドシートを接合すると、押し出し隆起部の形成時に縦皺が形成されたとしても、セカンドシートとの接合の際に押し出し隆起部の形状を崩さずにその皺をCD方向両側に伸ばして無くす又は目立たなくすることができる。
前記MD方向に隣接する押し出し隆起部の間におけるトップ・セカンド接合部は、前記中央位置からCD方向両側に連続的に延びるとともに、側方に向かうにつれて連続的又は段階的にMD方向長さが長くなる一体的な接合部である、請求項1記載の吸収性物品の製造方法。
本発明における「中央位置から側方に向かうにつれて連続的又は段階的にトップ・セカンド接合部によるMD方向接合範囲が広くなる接合パターン」は、互いに離間する複数のトップ・セカンド接合部により形成することもできるが、上記のような一体的パターンにより形成すると、皺防止効果により優れたものとなる。
前記MD方向に隣接する押し出し隆起部の間では、前記中央位置及び側方位置に前記トップ・セカンド接合部が互いに離間するように設けられており、MD方向の前記トップ・セカンド接合部の数又は長さが、前記中央位置から側方に向かうにつれて連続的又は段階的に多く又は長くなる、請求項1記載の吸収性物品の製造方法。
本発明における「中央位置から側方に向かうにつれて連続的又は段階的にトップ・セカンド接合部によるMD方向接合範囲が広くなる接合パターン」は、上記のような一体的パターンにより形成すると、トップシートの透過性や柔軟性が低下するおそれがあるが、本項記載のように互いに離間する複数のトップ・セカンド接合部により形成すると、そのようなおそれを低減することができ、また、皺防止効果も十分に発揮させることができる。
周面に多数の押し込み凸部が前記押し出し隆起部の配列パターンで形成された押し込みロールと、この押し込みロールに対向し、押し込み凸部に対応する凹部及びこれら凹部間に設けられた接合凸部を有する凹ロールと、この凹ロールに対向する接合ロールとを用い、
前記トップシートとなる不織布を下流側からのドローにより移送しつつ、前記押し込みロール及び凹ロール間に挟み、前記押し込みロールの凸部を前記凹ロールの凹部内に押し込むことにより前記押し出し隆起部を形成した後、そのまま凹ロールに巻き掛けて案内する過程で、トップシートとなる不織布の外側に、下流側からのドローにより前記セカンドシートの素材を送り込み、これらトップシートとなる不織布及びセカンドシートの素材を凹ロール及び接合ロール間に挟み、凹ロールの接合凸部と接合ロールの周面との間で加熱圧着することにより前記トップ・セカンド接合部を形成する、
請求項1~3のいずれか1項に記載の吸収性物品の製造方法。
このように、押し出し隆起部の形成直後に、その皺が吸収される間があまり無い状態でセカンドシートと接合する手法では、皺がより残りやすい。よって、本発明はこのような製造方法に適用するのが好ましい。
吸収体と、この吸収体の表側を被覆する不織布からなる液透過性トップシートと、トップシートの裏面に貼り合わされたセカンドシートと、を備えており、
前記トップシートに、裏側から表側に押し出されてなる押し出し隆起部が、幅方向及び前後方向にそれぞれ間隔を空けて多数配列されており、
前記トップシートにおける、幅方向及び前後方向に隣接する押し出し隆起部の間がセカンドシートと接合されて、幅方向及び前後方向に間欠的な接合パターンで多数のトップ・セカンド接合部が形成されている、吸収性物品において、
前記トップシートにおける、MD方向に隣接する押し出し隆起部の間では、少なくとも、当該隣接する押し出し隆起部のCD方向中央部を結ぶ仮想線上の中央位置及びこの中央位置のCD方向両側の側方位置に前記トップ・セカンド接合部が形成される接合パターンであって、かつ前記中央位置から側方に向かうにつれて連続的又は段階的にMD方向接合範囲が広くなる接合パターンで、前記トップシート及びセカンドシートが接合されている、
ことを特徴とする吸収性物品。
請求項1記載の発明と同様の作用効果が奏せられる。なお、吸収性物品における「MD方向」及び「CD方向」とは、押し出し隆起部の加工設備の「MD方向」及び「CD方向」を意味し、いずれか一方が前後方向となるものであり、他方が幅方向となるものである。そして、製品におけるMD方向は、トップシートの不織布の繊維配向の方向である。繊維配向とは、不織布の繊維が沿う方向であり、例えば、TAPPI標準法T481の零距離引張強さによる繊維配向性試験法に準じた測定方法や、前後方向及び幅方向の引張強度比から繊維配向方向を決定する簡易的測定方法により判別することができる。
前記MD方向に隣接する押し出し隆起部の間におけるトップ・セカンド接合部は、前記中央位置からCD方向両側に連続的に延びるとともに、側方に向かうにつれて連続的又は段階的にMD方向長さが長くなる一体的な接合部である、請求項5記載の吸収性物品。
請求項2記載の発明と同様の作用効果が奏せられる。
前記MD方向に隣接する押し出し隆起部の間におけるトップ・セカンド接合部は、MD方向長さが、MD方向に隣接する前記押し出し隆起部のCD方向列のMD方向中心間隔の0.1~1倍、かつCD方向長さが、CD方向に隣接する前記押し出し隆起部のMD方向列のCD方向中心間隔の0.3~1倍の、CD方向に長い横長形状の接合部である、請求項6記載の吸収性物品。
上記一体的な接合部の寸法は特に限定されないが、本項記載の範囲内であることが好ましい。
前記MD方向に隣接する押し出し隆起部の間では、前記中央位置及び側方位置に前記トップ・セカンド接合部が互いに離間するように設けられており、MD方向の前記トップ・セカンド接合部の数又は長さが、前記中央位置から側方に向かうにつれて連続的又は段階的に多く又は長くなる、請求項5記載の吸収性物品。
請求項3記載の発明と同様の作用効果が奏せられる。
前記MD方向に隣接する押し出し隆起部の間における各トップ・セカンド接合部は、MD方向長さが、MD方向に隣接する前記押し出し隆起部のCD方向列のMD方向中心間隔の0.1~0.4倍、かつCD方向長さが、CD方向に隣接する前記押し出し隆起部のMD方向列のCD方向中心間隔の0.1~0.4倍の、点状接合部である、請求項8記載の吸収性物品。
上記点状接合部の寸法は特に限定されないが、本項記載の範囲内であることが好ましい。
前記MD方向に隣接する押し出し隆起部の間における各トップ・セカンド接合部によるCD方向接合範囲が、CD方向に隣接する前記押し出し隆起部のMD方向列のCD方向中心間隔の0.3~1倍であり、
CD方向に隣接する押し出し隆起部の間における各トップ・セカンド接合部によるMD方向接合範囲が、MD方向に隣接する前記押し出し隆起部のCD方向列のMD方向中心間隔の0.3~1倍である、
請求項5~9のいずれか1項に記載の吸収性物品。
MD方向に隣接する押し出し隆起部の間における各トップ・セカンド接合部によるCD方向接合範囲が広すぎると、トップ・セカンド接合部がCD方向に連続するのと変わりなくなり、また、CD方向に隣接する押し出し隆起部の間における各トップ・セカンド接合部によるMD方向接合範囲が広すぎると、トップ・セカンド接合部がMD方向に連続するのと変わりなくなり、トップシートの透過性や柔軟性が低下するおそれがある。よって、本項記載のようにMD方向及びCD方向ともに十分な間隔を空けることが望ましい。
図1~図6はテープタイプ使い捨ておむつの一例を示しており、図中の符号Xはファスニングテープを除いたおむつの全幅を示しており、符号Lはおむつの全長を示している。各構成部材は、以下に述べる固定又は接合部分以外も、必要に応じて公知のおむつと同様に固定又は接合される。これらの固定又は接合のための手段としては、ホットメルト接着剤や溶着(加熱溶着、超音波溶着)を適宜選択することができる。
(外装シート)
外装シート12は吸収要素50を支持し、着用者に装着するための部分である。外装シート12は、両側部の前後方向中央部が括れた砂時計形状とされており、ここが着用者の脚を囲む部位となる。
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や、ポリエチレンシート等に不織布を積層したラミネート不織布、防水フィルムを介在させて実質的に液不透過性を確保した不織布(この場合は、防水フィルムと不織布とで液不透過性シートが構成される。)などを例示することができる。もちろん、このほかにも、近年、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も例示することができる。この液不透過性かつ透湿性を有する素材のシートとしては、例えば、ポリエチレンやポリプロピレン等のオレフィン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シートを例示することができる。さらに、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、高吸水性樹脂または疎水性樹脂や撥水剤の塗工といった方法により、防水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。
トップシート30は液透過性を有する有孔又は無孔の不織布を用いる。不織布は、その原料繊維が何であるかは、特に限定されない。例えば、ポリエチレンやポリプロピレン等のオレフィン系、ポリエステル系、ポリアミド系等の合成繊維、レーヨンやキュプラ等の再生繊維、綿等の天然繊維などや、これらから二種以上が使用された混合繊維、複合繊維などを例示することができる。さらに、不織布は、どのような加工によって製造されたものであってもよい。加工方法としては、公知の方法、例えば、スパンレース法、スパンボンド法、サーマルボンド法、メルトブローン法、ニードルパンチ法、エアスルー法、ポイントボンド法等を例示することができる。例えば、柔軟性、ドレープ性を求めるのであれば、スパンレース法が、嵩高性、ソフト性を求めるのであれば、サーマルボンド法が、好ましい加工方法となる。
トップシート30を透過した排泄液を吸収体56側へ速やかに移動させるため、及び逆戻りを防ぐために、トップシート30の裏面にセカンドシート40が接合されている。セカンドシート40をトップシート30に接合するためにヒートエンボスや超音波溶着を用いる場合は、セカンドシート40の素材はトップシート30と同程度の融点をもつものが好ましい。セカンドシート40としては、不織布を用いる他、多数の透過孔を有する樹脂フィルムを用いることもできる。不織布としては、トップシート30の項で説明したものと同様の素材を用いることができるが、トップシート30より親水性が高いものや、繊維密度が高いものが、トップシート30からセカンドシート40への液の移動特性に優れるため好ましい。
トップシート30上を伝わって横方向に移動する尿や軟便を阻止し、横漏れを防止するために、製品の両側に、使用面側に突出(起立)する側部立体ギャザー60、60を設けるのは好ましい。
各サイドフラップ部SF,SFには、図1~図3に示すように、ギャザーシート62の固着部分のうち固着始端近傍の幅方向外側において、ギャザーシート62と液不透過性シート11との間に、糸ゴム等からなる脚周り弾性伸縮部材64が前後方向に沿って伸長された状態で固定されており、これにより各サイドフラップ部SF,SFの脚周り部分が平面ギャザーとして構成されている。脚周り弾性伸縮部材64はサイドフラップ部SFにおける液不透過性シート11と外装シート12との間に配置することもできる。脚周り弾性伸縮部材64は、図示例のように各側で複数本設ける他、各側に1本のみ設けることもできる。
吸収要素50は、尿や軟便などの液を吸収保持する部分である。吸収要素50は、吸収体56と、この吸収体56の少なくとも裏面及び側面を包む包装シート58とを有している。包装シート58は省略することもできる。吸収要素50は、その裏面においてホットメルト接着剤等の接着剤を介して液不透過性シート11の内面に接着することができる。
吸収体56は、繊維の集合体により形成することができる。この繊維集合体としては、綿状パルプや合成繊維等の短繊維を積繊したものの他、セルロースアセテート等の合成繊維のトウ(繊維束)を必要に応じて開繊して得られるフィラメント集合体も使用できる。繊維目付けとしては、綿状パルプや短繊維を積繊する場合は、例えば100~300g/m2程度とすることができ、フィラメント集合体の場合は、例えば30~120g/m2程度とすることができる。合成繊維の場合の繊度は、例えば、1~16dtex、好ましくは1~10dtex、さらに好ましくは1~5dtexである。フィラメント集合体の場合、フィラメントは、非捲縮繊維であってもよいが、捲縮繊維であるのが好ましい。捲縮繊維の捲縮度は、例えば、1インチ当たり5~75個、好ましくは10~50個、さらに好ましくは15~50個程度とすることができる。また、均一に捲縮した捲縮繊維を用いる場合が多い。
吸収体56は、高吸収性ポリマー粒子を含むのが好ましく、特に、少なくとも液受け入れ領域において、繊維の集合体に対して高吸収性ポリマー粒子(SAP粒子)が実質的に厚み方向全体に分散されているものが望ましい。
包装シート58を用いる場合、その素材としては、ティッシュペーパ、特にクレープ紙、不織布、ポリラミ不織布、小孔が開いたシート等を用いることができる。ただし、高吸収性ポリマー粒子が抜け出ないシートであるのが望ましい。クレープ紙に換えて不織布を使用する場合、親水性のSMMS(スパンボンド/メルトブローン/メルトブローン/スパンボンド)不織布が特に好適であり、その材質はポリプロピレン、ポリエチレン/ポリプロピレンなどを使用できる。繊維目付けは、5~40g/m2、特に10~30g/m2のものが望ましい。
図1、図2及び図7に示されるように、ファスニングテープ13は、おむつの側部に固定されたテープ取付部13C、及びこのテープ取付部13Cから突出するテープ本体部13Bをなすシート基材と、このシート基材におけるテープ本体部13Bの幅方向中間部に設けられた、腹側に対する係止部13Aとを有し、この係止部13Aより先端側が摘み部とされたものである。ファスニングテープ13のテープ取付部13Cは、サイドフラップ部における内側層をなすギャザーシート62及び外側層をなす外装シート12間に挟まれ、かつホットメルト接着剤により両シート62,12に接着されている。また、係止部13Aはシート基材に接着剤により剥離不能に接合されている。
腹側Fにおけるファスニングテープ13の係止箇所には、係止を容易にするためのターゲット有するターゲットシート12Tを設けるのが好ましい。ターゲットシート12Tは、係止部がフック材13Aの場合、フック材の係合突起が絡まるようなループ糸がプラスチックフィルムや不織布からなるシート基材の表面に多数設けられたものを用いることができ、また粘着材層の場合には粘着性に富むような表面が平滑なプラスチックフィルムからなるシート基材の表面に剥離処理を施したものを用いることができる。また、腹側Fにおけるファスニングテープ13の係止箇所が不織布からなる場合、例えば図示形態の外装シート12が不織布からなる場合であって、ファスニングテープ13の係止部がフック材13Aの場合には、ターゲットシート12Tを省略し、フック材13Aを外装シート12の不織布に絡ませて係止することもできる。この場合、ターゲットシート12Tを外装シート12と液不透過性シート11との間に設けてもよい。
エンドフラップ部EFは、吸収性本体部10の前側及び後側にそれぞれ延出する部分であって、且つ吸収要素50を有しない部分であり、前側の延出部分が腹側エンドフラップ部EFであり、後側の延出部分が背側エンドフラップ部EFである。
図示形態では、両ファスニングテープ13間に、幅方向に弾性伸縮する帯状の背側伸縮ウエストシート70が設けられ、おむつ背側部におけるフィット性を向上させている。背側伸縮ウエストシート70の両端部は両ファスニングテープ13の取り付け部分と重なる部位まで延在されているのが好ましいが、幅方向中央側に離間していても良い。背側伸縮ウエストシート70の前後方向寸法は、ファスニングテープ13の取り付け部分の前後方向寸法と概ね同じにするのが適当であるが、±20%程度の寸法差はあってもよい。また、図示のように背側伸縮ウエストシート70が背側エンドフラップ部EFと吸収要素50の境界線と重なるように配置されていると、吸収要素50の背側端部がしっかりと体に押し当てられるため、好ましい。背側伸縮ウエストシート70は、ゴムシート等のシート状弾性部材を用いても良いが、通気性の観点から不織布や紙を用いるのが好ましい。この場合、伸縮不織布のような通気性を有するシート状弾性部材を用いることもできるが、図5に示すように、二枚の不織布等のシート基材71をホットメルト接着剤等の接着剤により張り合わせるとともに、両シート基材71間に有孔のシート状、網状、細長状(糸状又は紐状等)等の弾性伸縮部材72を幅方向に沿って伸長した状態で固定したものが好適に用いられる。この場合におけるシート基材71としては、外装シート12と同様のものを用いることができる。弾性伸縮部材72の伸長率は150~250%程度であるのが好ましい。また、弾性伸縮部材72として細長状(糸状又は紐状等)のものを用いる場合、太さ420~1120dtexのものを3~10mmの間隔72dで5~15本程度設けるのが好ましい。
トップシート30には、エンボス加工により裏側から表側に押し出されてなる押し出し隆起部31が、幅方向及び前後方向にそれぞれ間隔を空けて多数配列される。この配列様式は、図8及び図9に示すように行列状とする他、図10に示すように千鳥状(隣接列で互い違いとなる配置)とすることもできる。
図9及び図10にも示すように、トップシート30における、幅方向及び前後方向に隣接する押し出し隆起部31の間の部分がセカンドシート40と接合されることにより、幅方向及び前後方向に間欠的な接合パターンで多数のトップ・セカンド接合部80が形成されている。そして特徴的には、このトップシート30及びセカンドシート40の接合パターンは、MD方向に隣接する押し出し隆起部31の間では、当該隣接する押し出し隆起部31のCD方向中央部と対応するCD方向中央位置及びこの中央位置のCD方向両側の側方位置にトップ・セカンド接合部80が形成される接合パターンであって、かつ中央位置から側方に向かうにつれて連続的又は段階的にMD方向接合範囲A1,A2が広くなる接合パターン(以下、皺防止パターンともいう)とされている。図9(a)に示されるパターンを採用したトップシート30及びセカンドシート40の組み立て体のサンプル写真が図13に示されている。このように、MD方向に隣接する押し出し隆起部31の間に特徴的な接合パターンを採用することにより、図14(a)に示す本発明サンプルからも明らかなように、押し出し隆起部31の形成時に縦皺が形成されたとしても、セカンドシート40との接合の際に押し出し隆起部31の形状を崩さずにその皺をCD方向両側に伸ばして無くす又は目立たなくすることができる。これに対して、上記条件を満たさないトップ・セカンド接合部80を有する比較サンプルでは、MD方向に沿う皺がCD方向に間隔を空けて多数形成されてしまい、見栄えが悪化する。
図12は、上述の使い捨ておむつを製造するためのトップシート30及びセカンドシート40の加工設備を示している。すなわち、この設備は、周面に多数の押し込み凸部90aが前述の押し出し隆起部31の配列パターンで形成された押し込みロール90と、この押し込みロール90に対向し、押し込み凸部90aに対応する凹部91a、及びこれら凹部91a間に前述のトップ・セカンド接合部80の配列で設けられた接合凸部91bを有する凹ロール91と、この凹ロール91に対向する接合ロール92とを備えている。押し込みロール90の凸部の形状は適宜定めることができるが、形成する押し出し隆起部31の形状に合わせた断面(例えば円形、楕円形、正多角形等)の裁頭円錐台状であるのが好ましい。また、凹ロール91の凹部91aは、隆起部が形成される限り、凸部が入り込む大きさの、底面がない「開孔」でもよく、本発明における「凹部91a」はかかる「開孔」も含む意味である。これら押し込みロール90及び凹ロール91により形成される押し出し隆起部31の寸法・形状は、図9及び図10に二点鎖線で示すように押し込み凸部及び凹部91aとほぼ対応するものとなる。
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。
(ゲル強度)
ゲル強度は次のようにして測定されるものである。人工尿(尿素:20wt%、食塩:8wt%、塩化カルシウム二水和物:0.3wt%、酸化マグネシウム七水和物:0.8wt%、純水:70.01wt%)49.0gに、高吸収性ポリマーを1.0g加え、スターラーで攪拌させる。生成したゲルを40℃×60%RHの恒温恒湿槽内に3時間放置したあと常温にもどし、カードメーター(I.techno Engineering社製:Curdmeter-MAX ME-500)でゲル強度を測定する。
不織布等のシートの目付けは次のようにして測定されるものである。試料又は試験片を予備乾燥した後、標準状態(試験場所は、温度20±5℃、相対湿度65%以下)の試験室又は装置内に放置し、恒量になった状態にする。予備乾燥は、試料又は試験片を相対湿度10~25%、温度50℃を超えない環境で恒量にすることをいう。なお、公定水分率が0.0%の繊維については、予備乾燥を行わなくてもよい。恒量になった状態の試験片から米坪板(200mm×250mm、±2mm)を使用し、200mm×250mm(±2mm)の寸法の試料を切り取る。試料の重量を測定し、20倍して1平米あたりの重さを算出し、目付けとする。
厚みは、自動厚み測定器(KES-G5 ハンディ圧縮計測プログラム)を用い、荷重:10gf/cm2、及び加圧面積:2cm2の条件下で自動測定する。
「前後方向(縦方向)」とは腹側(前側)と背側(後側)を結ぶ方向を意味し、「幅方向」とは前後方向と直交する方向(左右方向)を意味し、「上下方向」とはおむつの装着状態、すなわちおむつの腹側部分と背側部分を重ね合わせるようにおむつを股間部で2つに折った際に幅方向と直交する方向を意味する。
「伸長率」は自然長を100%としたときの値を意味する。
Claims (10)
- 吸収体と、この吸収体の表側を被覆する不織布からなる液透過性トップシートと、トップシートの裏面に貼り合わされたセカンドシートと、を備えており、
前記トップシートに、裏側から表側に押し出されてなる押し出し隆起部が、幅方向及び前後方向にそれぞれ間隔を空けて多数配列されており、
前記トップシートにおける、幅方向及び前後方向に隣接する押し出し隆起部の間がセカンドシートと接合されて、幅方向及び前後方向に間欠的な接合パターンで多数のトップ・セカンド接合部が形成されている、吸収性物品の製造方法において、
前記トップシート及びセカンドシートを組み立てるにあたり、
前記トップシートとなる不織布を下流側からのドローにより移送しつつエンボス加工により前記押し出し隆起部を形成した後、
この押し出し隆起部を形成した不織布の裏面に前記セカンドシートの素材を合わせ、MD方向に隣接する押し出し隆起部の間では、当該隣接する押し出し隆起部のCD方向中央部と対応するCD方向中央位置及びこの中央位置のCD方向両側の側方位置に前記トップ・セカンド接合部が形成される接合パターンであって、かつ前記中央位置から側方に向かうにつれて連続的又は段階的に前記トップ・セカンド接合部によるMD方向接合範囲が広くなる接合パターンで、前記不織布及びセカンドシートの素材を接合する、
ことを特徴とする吸収性物品の製造方法。 - 前記MD方向に隣接する押し出し隆起部の間におけるトップ・セカンド接合部は、前記中央位置からCD方向両側に連続的に延びるとともに、側方に向かうにつれて連続的又は段階的にMD方向長さが長くなる一体的な接合部である、請求項1記載の吸収性物品の製造方法。
- 前記MD方向に隣接する押し出し隆起部の間では、前記中央位置及び側方位置に前記トップ・セカンド接合部が互いに離間するように設けられており、MD方向の前記トップ・セカンド接合部の数又は長さが、前記中央位置から側方に向かうにつれて連続的又は段階的に多く又は長くなる、請求項1記載の吸収性物品の製造方法。
- 周面に多数の押し込み凸部が前記押し出し隆起部の配列パターンで形成された押し込みロールと、この押し込みロールに対向し、押し込み凸部に対応する凹部及びこれら凹部間に設けられた接合凸部を有する凹ロールと、この凹ロールに対向する接合ロールとを用い、
前記トップシートとなる不織布を下流側からのドローにより移送しつつ、前記押し込みロール及び凹ロール間に挟み、前記押し込みロールの凸部を前記凹ロールの凹部内に押し込むことにより前記押し出し隆起部を形成した後、そのまま凹ロールに巻き掛けて案内する過程で、トップシートとなる不織布の外側に、下流側からのドローにより前記セカンドシートの素材を送り込み、これらトップシートとなる不織布及びセカンドシートの素材を凹ロール及び接合ロール間に挟み、凹ロールの接合凸部と接合ロールの周面との間で加熱圧着することにより前記トップ・セカンド接合部を形成する、
請求項1~3のいずれか1項に記載の吸収性物品の製造方法。 - 吸収体と、この吸収体の表側を被覆する不織布からなる液透過性トップシートと、トップシートの裏面に貼り合わされたセカンドシートと、を備えており、
前記トップシートに、裏側から表側に押し出されてなる押し出し隆起部が、幅方向及び前後方向にそれぞれ間隔を空けて多数配列されており、
前記トップシートにおける、幅方向及び前後方向に隣接する押し出し隆起部の間がセカンドシートと接合されて、幅方向及び前後方向に間欠的な接合パターンで多数のトップ・セカンド接合部が形成されている、吸収性物品において、
前記トップシートにおける、MD方向に隣接する押し出し隆起部の間では、少なくとも、当該隣接する押し出し隆起部のCD方向中央部を結ぶ仮想線上の中央位置及びこの中央位置のCD方向両側の側方位置に前記トップ・セカンド接合部が形成される接合パターンであって、かつ前記中央位置から側方に向かうにつれて連続的又は段階的にMD方向接合範囲が広くなる接合パターンで、前記トップシート及びセカンドシートが接合されている、
ことを特徴とする吸収性物品。 - 前記MD方向に隣接する押し出し隆起部の間におけるトップ・セカンド接合部は、前記中央位置からCD方向両側に連続的に延びるとともに、側方に向かうにつれて連続的又は段階的にMD方向長さが長くなる一体的な接合部である、請求項5記載の吸収性物品。
- 前記MD方向に隣接する押し出し隆起部の間におけるトップ・セカンド接合部は、MD方向長さが、MD方向に隣接する前記押し出し隆起部のCD方向列のMD方向中心間隔の0.1~1倍、かつCD方向長さが、CD方向に隣接する前記押し出し隆起部のMD方向列のCD方向中心間隔の0.3~1倍の、CD方向に長い横長形状の接合部である、請求項6記載の吸収性物品。
- 前記MD方向に隣接する押し出し隆起部の間では、前記中央位置及び側方位置に前記トップ・セカンド接合部が互いに離間するように設けられており、MD方向の前記トップ・セカンド接合部の数又は長さが、前記中央位置から側方に向かうにつれて連続的又は段階的に多く又は長くなる、請求項5記載の吸収性物品。
- 前記MD方向に隣接する押し出し隆起部の間における各トップ・セカンド接合部は、MD方向長さが、MD方向に隣接する前記押し出し隆起部のCD方向列のMD方向中心間隔の0.1~0.4倍、かつCD方向長さが、CD方向に隣接する前記押し出し隆起部のMD方向列のCD方向中心間隔の0.1~0.4倍の、点状接合部である、請求項8記載の吸収性物品。
- 前記MD方向に隣接する押し出し隆起部の間における各トップ・セカンド接合部によるCD方向接合範囲が、CD方向に隣接する前記押し出し隆起部のMD方向列のCD方向中心間隔の0.3~1倍であり、
CD方向に隣接する押し出し隆起部の間における各トップ・セカンド接合部によるMD方向接合範囲が、MD方向に隣接する前記押し出し隆起部のCD方向列のMD方向中心間隔の0.3~1倍である、
請求項5~9のいずれか1項に記載の吸収性物品。
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CN106061449A (zh) | 2016-10-26 |
BR112016021718B1 (pt) | 2022-05-17 |
CN106061449B (zh) | 2019-08-02 |
KR102287484B1 (ko) | 2021-08-06 |
EP3123993A1 (en) | 2017-02-01 |
US20170014280A1 (en) | 2017-01-19 |
US10470945B2 (en) | 2019-11-12 |
RU2016138569A3 (ja) | 2018-07-03 |
EP3123993B1 (en) | 2021-07-14 |
BR112016021718A2 (ja) | 2017-08-15 |
JP5918795B2 (ja) | 2016-05-18 |
EP3123993A4 (en) | 2017-10-18 |
JP2015188453A (ja) | 2015-11-02 |
KR20160138399A (ko) | 2016-12-05 |
RU2670048C2 (ru) | 2018-10-17 |
RU2016138569A (ru) | 2018-05-03 |
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