WO2019193906A1 - Article absorbant de type culotte - Google Patents

Article absorbant de type culotte Download PDF

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Publication number
WO2019193906A1
WO2019193906A1 PCT/JP2019/008835 JP2019008835W WO2019193906A1 WO 2019193906 A1 WO2019193906 A1 WO 2019193906A1 JP 2019008835 W JP2019008835 W JP 2019008835W WO 2019193906 A1 WO2019193906 A1 WO 2019193906A1
Authority
WO
WIPO (PCT)
Prior art keywords
region
sheet
elastic
nonwoven fabric
stretchable
Prior art date
Application number
PCT/JP2019/008835
Other languages
English (en)
Japanese (ja)
Inventor
藍子 恩田
優輔 浦山
玲子 大西
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018071051A external-priority patent/JP7037990B2/ja
Priority claimed from JP2018071050A external-priority patent/JP7118704B2/ja
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to GB2013122.3A priority Critical patent/GB2585293B/en
Priority to DE112019000549.9T priority patent/DE112019000549T5/de
Priority to RU2020128594A priority patent/RU2757895C1/ru
Priority to CN201980005870.9A priority patent/CN111405887B/zh
Publication of WO2019193906A1 publication Critical patent/WO2019193906A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—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
    • A61F13/45—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
    • 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
    • A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
    • 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

Definitions

  • the present invention relates to a pants-type absorbent article such as a disposable diaper.
  • a stretchable nonwoven fabric is provided on the waist portion of the exterior body for the purpose of improving fit to the wearer's waistline.
  • the underpants type absorbent article which concerns on one form of this invention has an absorber, a waist part, and a crotch part.
  • the absorber is located in the crotch.
  • the waist portion has an abdominal side portion and a back side portion located around the waist.
  • the crotch part is located between the abdominal side part and the back side part, and holds the absorber together with the abdominal side part and the back side part.
  • Expansion and contraction in which at least one of the ventral portion and the dorsal side portion includes a first region and a second region located above the first region in the vertical direction perpendicular to the circumferential direction of the trunk. Consists of sheets.
  • the elastic sheet includes an elastic resin and a non-woven fabric layer containing the elastic resin, and the first region and the second region have mutually different circumferential shrinkage stresses, and the first region
  • the dimension in the circumferential direction in the natural state is the same in the second area and the second area.
  • the elastic sheet according to one embodiment of the present invention includes a plurality of elastic filaments and two layers of nonwoven fabric.
  • the elastic filament can be expanded and contracted in the first direction.
  • the two-layered nonwoven fabric is disposed so as to face the plurality of elastic filaments.
  • the non-woven fabric is adjacent to the plurality of convex portions and the plurality of convex portions that are intermittently disposed along the first direction and extend along a second direction orthogonal to the first direction.
  • a flat portion extending along the second direction, which is disposed between the fitting convex portions.
  • the convex portion has a first convex portion and a second convex portion having different heights along the second direction, and the second convex portion is higher than the first convex portion. Is high.
  • FIG. 1 is a perspective view of a disposable diaper according to first to sixth embodiments of the present invention.
  • FIG. It is a schematic exploded perspective view in the deployment state of the disposable diaper of a 1st embodiment. It is a top view showing the deployment state of the disposable diaper of a 1st embodiment, and is the figure seen from the inside. It is a top view which shows the expansion
  • FIG. 4 is a developed schematic perspective view of a region surrounded by an ellipse V in FIG. 3, showing a natural state where the extension of the exterior body is released, and showing a state where the folded portion is developed.
  • FIG. 4 is a developed schematic perspective view of a region surrounded by an ellipse V in FIG. 3, showing a natural state where the extension of the exterior body is released, and showing a state where the folded portion is developed.
  • FIG. 4 is a sectional view taken along line VI-VI in FIG. 3.
  • (A) is an enlarged plan view showing the first sheet 11 in the region surrounded by the ellipse VIIA of FIG. 4, schematically showing the structure of the first sheet 11,
  • FIG. 8 is a cross-sectional view taken along the line VIIB-VIIB in FIG. It is the top view which shows the expansion
  • FIG. 14A is a cross-sectional view schematically showing a state cut along line IIA-IIA along the expansion / contraction direction of the elastic sheet of FIG. 14, and FIG. 14B is a cross section taken along line IIB-IIB of the elastic sheet of FIG. It is sectional drawing which shows typically the state which carried out.
  • FIG. 14 was straightened so as to straighten the wave shape of the elastic filament without extending the elastic filament, and the boundary surface between the first nonwoven fabric and the second nonwoven fabric was spread in a flat shape.
  • It is a perspective view which shows a state typically.
  • It is a schematic plan view of the expansion-contraction sheet
  • FIG. 14 It is a schematic plan view which shows the state which extended
  • (A) is sectional drawing which shows the state corresponding to FIG. 16 typically
  • (B) corresponds to FIG. 14, and the elastic shape of an elastic sheet, the wave shape of the interface of a 1st nonwoven fabric and a 2nd nonwoven fabric
  • FIG. 14 It is a general
  • (A) is a perspective view of the tooth gap extending roll used for the extending
  • (B) is a perspective view of the tooth
  • the subject of this invention is related with the underpants type absorbent article which exhibits the external appearance and tactile sensation which are close to the underwear pants (fabric), maintaining a fit.
  • the subject of this invention is related with the expansion-contraction sheet
  • the disposable diaper 1 which concerns on the 1st Embodiment of this invention is demonstrated using FIG.
  • the disposable diaper 1 is a pants-type absorbent article for capturing the excrement of an infant who is a wearer without leaking.
  • the disposable diaper 1 includes an exterior body 8 and an absorber 9.
  • the exterior body 8 constitutes the exterior of the disposable diaper 1.
  • the absorber 9 is held inside the exterior body 8. That is, the exterior body 8 is arrange
  • the inner side in each configuration indicates a side located on the skin side of the wearer when wearing the disposable diaper, and the outer side indicates a side opposite to the skin side of the wearer.
  • the exterior body 8 includes a waist part 16 and a crotch part 17 formed in series.
  • the waist part 16 forms the waist opening part 7, and is arrange
  • the waist part 16 is comprised with the expansion-contraction sheet
  • the crotch portion 17 is located below the waist portion 16 and is disposed on the wearer's crotch.
  • the waist part 16 has an abdominal side part 16a arranged on the front side when worn and a back side part 16b arranged on the rear side.
  • the abdominal side portion 16a and the back side portion 16b are joined by, for example, heat sealing or ultrasonic sealing at the side seal portions 18 provided at both ends in the width direction orthogonal to the front-rear direction.
  • the waist part 16 becomes a cylinder shape and the waist opening part 7 is formed between the abdominal side part 16a and the back side part 16b.
  • the crotch part 17 is located between the ventral part 16a and the dorsal part 16b.
  • the crotch portion 17 connects the abdominal side portion 16a and the back side portion 16b so as to form a pair of leg openings 14 through which the wearer's legs are inserted on both sides in the width direction.
  • the leg crotch portion 17 is provided with a leg gather 19 including a rubber thread 19 a disposed along the leg opening 14. The leg gather 19 fits the wearer's leg inserted through the leg opening 14 by the expansion and contraction of the rubber thread 19a.
  • FIGS. 2 to 4 The disposable diaper 1 and the exterior body 8 shown in FIGS. 2 to 4 are separated from the abdominal side portion 16a and the back side portion 16b by peeling the side seal portion 18 from the state shown in FIG. In this state, the body 9 is extended along the XY plane.
  • FIG. 3 illustrates a state in which the second sheet 12 constituting the exterior body 8 is positioned on the near side and the first sheet 11 is positioned on the back side, and the absorber 9 is illustrated by a dotted line for convenience.
  • the lower right corner portion of the back side portion 16 b of the second sheet 12 and the adhesive layer 13 positioned corresponding thereto are cut out and positioned on the back side.
  • the first sheet 11 is shown so that it can be seen.
  • FIG. 4 illustrates a state in which the first sheet 11 constituting the exterior body 8 is positioned on the near side and the second sheet 12 is positioned on the back side, and the adhesive layer 13 is illustrated by a solid line for convenience.
  • the second sheet in order to show the laminated state of the exterior body 8, the second sheet is located on the back side by cutting out the lower right corner portion of the first sheet 11 and the adhesive layer 13 positioned corresponding thereto. 12 so that 12 can be seen.
  • FIGS. 9 to 12 described later illustrates a state in which the first sheet 11 constituting the exterior body 8 is positioned on the near side and the second sheet 12 is positioned on the back side, and the adhesive layer 13 is illustrated by a solid line for convenience.
  • the second sheet in order to show the laminated state of the exterior body 8, the second sheet is located on the back side by cutting out the lower right corner portion of the first sheet 11 and the adhesive layer 13 positioned corresponding thereto. 12 so that 12 can be seen.
  • FIGS. 9 to 12 described later The same applies to FIGS.
  • the exterior body 8 includes a composite sheet 10 in which a first sheet 11 and a second sheet 12 are bonded together with an adhesive layer 13.
  • seat 11 which comprises the exterior body 8 becomes the form folded back inside.
  • 3 shows a state where the folded portion 20 of the first sheet 11 is folded inward
  • FIG. 4 shows a state where the folded portion 20 is unfolded.
  • the X-axis direction corresponds to the front-rear direction
  • the Y-axis direction corresponds to the width direction
  • the Z-axis direction corresponds to the thickness direction.
  • the circumferential direction of the trunk in the ventral side portion 16a and the back side portion 16b of the waist portion 16 in FIG. 1 corresponds to the width direction Y in FIGS.
  • the vertical direction corresponds to the vertical direction of the disposable diaper 1 when the wearer wears the disposable diaper 1 in a standing state.
  • the front-rear direction and the vertical direction coincide with each other.
  • the disposable diaper 1 will be described in the mode shown in FIGS.
  • the absorber 9 is configured to capture excrement and absorb liquid contained in the excrement.
  • the absorber 9 is formed in a band shape, and is disposed in a wide range from the crotch portion 17 to the abdomen side portion 16a and the back side portion 16b of the waist portion 16 in the exterior body 8.
  • the absorber 9 absorbs liquid mainly in a region where excrement is captured in the crotch part 17.
  • the liquid absorbed by the absorber 9 is sucked up toward the waist portion 16 without staying in the region. That is, the absorbent body 9 can hold the liquid in a wide range across the crotch portion 17 and the waist portion 16.
  • a sufficient amount of liquid can be absorbed by the absorber 9.
  • the exterior body 8 is composed of a composite sheet 10 which is an expandable sheet.
  • the composite sheet 10 includes a first sheet 11 made of a stretchable nonwoven fabric composed of a nonwoven fabric layer containing an elastic resin, a second sheet 12 made of a non-stretchable nonwoven fabric facing the first sheet 11, and a first sheet
  • the sheet 11 and the second sheet 12 are bonded to each other.
  • the first sheet is a stretchable sheet
  • the second sheet is a non-stretchable sheet.
  • the stretchable nonwoven fabric means one having a recovery rate (elongation recovery rate) of 70% or more when stretched at least 100% in the same direction as the shrinkage direction.
  • the elongation of the stretchable nonwoven fabric (first sheet) used in this embodiment is preferably 100% or more, and more preferably 150% or more.
  • the second sheet 12 is provided facing the inside of the first sheet 11, and the first sheet 11 is located on the outer surface 8 a side of the exterior body 8. Details of the sheets 11 and 12 and the adhesive layer 13 constituting the exterior body 8 will be described later.
  • the waist part 16 of the exterior body 8 has elasticity in the circumferential direction of the trunk.
  • the ventral side portion 16 a (back side portion 16 b) of the waist portion 16 of the exterior body 8 that is required to be stretchable in the trunk circumferential direction is different in the contraction stress in the circumferential direction of the trunk from each other. It has the area
  • the first region 31a (first region 31b), the second region 32a (second region 32b), and the third region 33a (third region 33b) are in a natural state (stress release state).
  • the dimensions of the cylinder in the circumferential direction are equal.
  • the tensile load (cN) per unit length (1 mm) when the sheet is stretched to 185% of the length of the natural state in the circumferential direction and then contracted to 140% is expressed as the contraction stress of the sheet.
  • the first region 31 (second region 32, third region 33) is the first region 31a on the ventral side (second region 32a on the ventral side, third region 33a on the ventral side).
  • the first region 31b of the back side part (the second region 32b of the back side part, the third region 33b of the back side part). This is referred to as a region 31 (second region 32, third region 33).
  • the stretchable area is indicated by a dot pattern
  • the degree of contraction stress in each area is indicated by the density of the dot pattern. The higher the shrinkage stress, the higher the density of the dot pattern, and the lower the density, the lower the density. The same applies to the dot patterns in the drawings used for the description of other embodiments described later.
  • the first region 31, the second region 32, and the third region 33 have mutually different shrinkage stresses.
  • the contraction stress is highest in the first region 31, next highest in the third region 33, and lowest in the second region 32. That is, when the first to third regions 31 to 33 are elongated at the same elongation rate, the force (shrinkage stress) for contracting and returning to each region is different. Thereby, when the waist part 16 is extended
  • the second region 32 and the third region 33 are located above the first region 31 in the vertical direction perpendicular to the circumferential direction of the trunk. That is, the contraction stress is configured to be higher on the lower side than on the upper side of the waist portion 16.
  • the third region 33 is located at the opening peripheral edge 15 that is the upper edge of the exterior body 8.
  • the composite sheet 10 constituting the exterior body 8 is folded inward toward the lower side in the vertical direction to form the third region 33.
  • the length of the third region 33 in the vertical direction is equal to or less than 1 ⁇ 2 of the length of the second region 32 in the vertical direction, and is approximately 1 / in the present embodiment.
  • the first sheet 11 has a portion that extends more than the second sheet 12 at both ends in the front-rear direction, and the extended portion is a folded portion. It is 20.
  • the folding unit 20 is folded using the positions of both end edges in the front-rear direction of the second sheet 12 as folding positions. This folding position corresponds to the position of the opening peripheral edge 15 when the disposable diaper 1 is used.
  • FIGS. 5 and 6 both show partial views of the dorsal side portion 16b, but the ventral side portion 16a has the same configuration.
  • the first sheet 11 is a single-layer stretchable nonwoven fabric formed continuously from the ventral side portion 16a through the crotch portion 17 to the backside portion 16b, that is, a stretchable nonwoven fabric composed of one sheet. As shown in FIGS. 2, 4, and 5, the first sheet 11 has an extending portion that extends beyond the second sheet 12 at both ends in the front-rear direction. This extending portion is a folded portion 20 that is folded inward. A folded portion where the folded portion 20 is folded becomes a third region 33. As shown in FIG. 6, in the third region 33, two first sheets 11, one second sheet 12, and two adhesive layers 13 are laminated, and the first sheet 11 is The structure is double.
  • the first sheet 11 of the waist portion 16 of the exterior body 8 has a high contraction stress region P ⁇ b> 1 and a low contraction stress region in which the contraction stress differs in the front-rear direction in the expanded state where the folded portion 20 is expanded. P2.
  • the shrinkage stress differs between the high shrinkage stress region P1 and the low shrinkage stress region P2.
  • the shrinkage stress in the low shrinkage stress region P2 is lower than that in the high shrinkage stress region P1.
  • the width dimension of the low shrinkage stress region P2 is equal to the width dimension of the high shrinkage stress region P1.
  • the high shrinkage stress region P1 corresponds to the first region 31.
  • the low shrinkage stress region P ⁇ b> 2 corresponds to the second region 32 and the third region 33.
  • the low contraction stress region P2 of the first sheet 11 is located in a single layer, whereas in the third region 33, the low contraction stress region P2 of the first sheet 11 is located double. is doing. For this reason, the contraction stress is higher in the third region 33 than in the second region 32.
  • the first sheet 11 of the exterior body 8 of the present embodiment has the high contraction stress region P1 and the low contraction stress region P2 that have different contraction stresses in the front-rear direction before the assembly of the exterior body 8. It has become.
  • the first sheet 11 is a stretchable nonwoven fabric having a plurality of elastic filaments 42 and a nonwoven fabric layer 41 containing the elastic filaments 42.
  • the first sheet 11 includes a nonwoven fabric layer 41 extending along the XY plane, and an elastic filament 42 as an elastic resin contained in the nonwoven fabric layer 41.
  • the nonwoven fabric layer 41 is formed of a nonwoven fabric composed of fibers with low elasticity.
  • the nonwoven fabric which forms the nonwoven fabric layer 41 is not limited to a specific kind, For example, it can select from an air through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spun bond nonwoven fabric, a melt blown nonwoven fabric, etc.
  • the fiber which comprises the nonwoven fabric layer 41 is not limited to a specific kind, For example, it can select from chemical fibers, such as polyethylene, a polypropylene, polyester, polyamide. Furthermore, the nonwoven fabric layer 41 may be comprised with the composite fiber containing several types of chemical fiber. In addition, the fibers constituting the nonwoven fabric layer 41 may be blended with natural fibers such as cotton and silk.
  • the elastic filament 42 is a thread-like elastic body that extends along the Y-axis direction. The plurality of elastic filaments 42 are arranged at equal intervals in the X-axis direction in the waist portion 16.
  • the elastic filament 42 can be formed of, for example, an elastic material such as a thermoplastic elastomer or rubber.
  • the elastic filament 42 is preferably formed of a thermoplastic elastomer that is easily fused with the fibers constituting the nonwoven fabric layer 41.
  • a thermoplastic elastomer that forms the elastic filament 42 for example, a styrene elastomer, an olefin elastomer, a polyester elastomer, a polyurethane elastomer, or the like can be used.
  • the elastic filament 42 can also be formed by combining a plurality of types of thermoplastic elastomers. Further, the elastic filament 42 may be a core-sheath type or a side-by-side type composite fiber.
  • stretchable portions 11a and connecting portions 11b extending in the X-axis direction are alternately arranged along the Y-axis direction.
  • seat 11 the basic weight of the nonwoven fabric layer 41 in the expansion-contraction part 11a is lower than the basic weight of the nonwoven fabric layer 41 in the connection part 11b. For this reason, it is easy to deform
  • strength is ensured by the connecting portion 11b which is not easily deformed.
  • connection part 11b In the stretched state of the first sheet 11 in the waist part 16, a force for stretching in the Y-axis direction is applied, so that the stretchable part 11a mainly stretches in the Y-axis direction.
  • extension state although both the connection part 11b and the expansion-contraction part 11a expand
  • the connection part 11b may be in a state where it does not substantially extend, and it is sufficient that the expansion / contraction part 11a has a higher degree of extension than the connection part 11b.
  • the first sheet 11 in the waist portion 16 contracts in the Y-axis direction by the elastic force of the elastic filament 42 when the force for extending in the Y-axis direction from the extended state is released.
  • the dimension of the stretchable part 11 a in the Y-axis direction is smaller than that in the expanded first sheet 11.
  • seat 11 is an elastic nonwoven fabric which can be expanded-contracted in a Y-axis direction.
  • the elastic filaments 42 are made of elastic fibers and are arranged at equal intervals in the X-axis direction.
  • the first region 31 is provided with an elastic filament 42a composed of a relatively thick elastic fiber
  • the second region 32 is composed of a relatively thin elastic fiber.
  • the elastic filament 42b is disposed. Thereby, the contraction stress of the 1st field 31 and the 2nd field 32 can be varied.
  • the first sheet 11 itself can be expanded and contracted by the elastic force of the elastic filament 42.
  • the waist portion 16 of the exterior body 8 can be expanded and contracted in the trunk circumferential direction in FIG. 1 using the stretchability of the first sheet 11. Therefore, the composite sheet 10 can be configured such that an elastic body such as rubber thread is not provided between the first sheet 11 and the second sheet 12.
  • the first sheet 11 can be manufactured by any manufacturing method.
  • the first sheet 11 can be manufactured using the elastic filament 42 and two nonwoven fabrics.
  • a laminate is formed by sandwiching an elastic filament 42 melt-spun between two nonwoven fabrics. Thereby, the nonwoven fabric and the elastic filament 42 are fused.
  • the basic weight of the nonwoven fabric layer 41 is constant, and the expansion-contraction part 11a and the connection part 11b are not formed.
  • stretching process extended to a Y-axis direction can be added only with respect to the expansion / contraction part 11a, for example. Thereby, only the basic weight of the expansion-contraction part 11a can be reduced, maintaining the basic weight of the connection part 11b.
  • Arbitrary methods can be used for the stretching process for forming the stretchable part 11a and the connecting part 11b in the first sheet 11, for example, a roll stretching process using two tooth groove rolls that mesh with each other is used. be able to.
  • this roll stretching process the first sheet 11 is intermittently stretched by biting the first sheet 11 between the rotated tooth gap rolls, and the stretchable portions 11a and the connecting portions 11b are alternately arranged. It is formed.
  • the two nonwoven fabrics are stretched to form the nonwoven fabric layer 41.
  • the first sheet 11 is formed by fusing the nonwoven fabric and the elastic filament 42 sandwiched between the nonwoven fabric, the elastic filament 42 is not exposed on the surface of the nonwoven fabric layer 41 and is included in the nonwoven fabric layer 41.
  • the first sheet 11 can be expanded and contracted by one sheet.
  • the first sheet 11 can be manufactured without using an adhesive. For this reason, in the 1st sheet
  • the elastic resin included in the nonwoven fabric layer 41 in the first sheet 11 is not limited to the configuration using the elastic filament 42 as long as it has at least the elasticity in the Y-axis direction.
  • the elastic resin included in the nonwoven fabric layer in the first sheet 11 may be an elastic fiber made of short fibers, for example.
  • the elastic filaments are arranged so that the elastic fibers extend in one direction without crossing each other.
  • the elastic fibers may be randomly arranged or any one of them. You may arrange
  • the adhesive layer 13 includes a plurality of adhesive portions 21 arranged between the first sheet 11 and the second sheet 12. As shown in FIG. 5, the adhesive layer 13 extends over the first region 31a (first region 31b) and the second region 32a (second region 32b) of the ventral side portion 16a (back side portion 16b). , Arranged to form a series of patterns.
  • the adhesive layer 13 is provided in a series of patterns over the entire region of the abdominal side portion 16a including the stretchable region and the entire region of the back side portion 16b.
  • the adhesive layer 13 is composed of a plurality of adhesive portions 21 arranged at intervals in the circumferential direction of the trunk.
  • the bonding portion 21 extends over the first region 31a (first region 31b) and the second region 32a (second region 32b) of the ventral side portion 16a (back side portion 16b).
  • Each of the plurality of adhesive portions 21 continuously extends in a narrow strip shape with an equal width along one direction, in the vertical direction in this embodiment, and is intermittently arranged at equal intervals in the circumferential direction of the body.
  • the adhesive layer 13 may also be provided in the crotch part 17 in a series of patterns continuously to the waist part 16. Good.
  • the adhesive layer 13 is typically formed of an adhesive.
  • various printing methods and various transfer methods can be used.
  • the printing method for example, gravure printing, letterpress printing, offset printing, or the like can be used.
  • the transfer method for example, roll transfer or thermal transfer can be used.
  • a hot melt adhesive is used as the adhesive forming the adhesive layer 13.
  • the adhesive layer 13 can be formed of various adhesives such as a thermoplastic adhesive and a reactive adhesive.
  • the adhesive layer 13 can also be formed of various adhesive members other than the adhesive.
  • an adhesive member for example, a sheet-like member having adhesiveness on both sides, such as a double-sided tape, can be mentioned.
  • the second sheet 12 made of a non-stretchable nonwoven fabric constituting a part of the composite sheet 10 can be composed of any non-stretchable member that is difficult to stretch in the Y-axis direction.
  • the non-stretchable member constituting the second sheet 12 for example, a nonwoven fabric, a woven fabric, paper, or the like can be used.
  • the second sheet 12 can be composed of a nonwoven fabric using fibers similar to the nonwoven fabric layer 41 of the first sheet 11 in order to obtain the same feel as the first sheet 11.
  • the outer shape of the second sheet 12 substantially matches the shape obtained by removing the folded portion 20 from the stretched state of the first sheet 11. Since the adhesive layer 13 extends in the vertical direction and is intermittently arranged in the circumferential direction of the cylinder, the stretched first sheet 11 and second sheet 12 are bonded together via the adhesive layer 13. Thereafter, in the natural state of the exterior body 8 in which the extended state of the first sheet 11 is released, as shown in FIG. 5, the second sheet 12 protrudes on the side opposite to the first sheet 11. A portion 35 is formed. The raised portion 35 is formed by the second sheet 12 that swells in a direction away from the first sheet 11 between adjacent rows of the bonding portions 21.
  • the plurality of adhesive portions 21 constituting the adhesive layer 13 are intermittently arranged at equal intervals in the circumferential direction of the trunk, so that each raised portion 35 extends in the vertical direction.
  • a plurality of lines are arranged at equal intervals in the circumferential direction, and wrinkles having a uniform pattern are formed inside the waist portion 16 of the exterior body 8 in the plane.
  • the plurality of raised portions 35 of the second sheet 12 form a series of patterns in a natural state where no extension is applied.
  • the series of patterns includes a pattern formed by the plurality of raised portions 35 formed in the first region 31 and a pattern formed by the plurality of raised portions 35 formed in the second region 32. It is the same, and the state where the flow of the pattern formed in each region continues without interruption also in the vicinity of the boundary between the first region 31 and the second region 32.
  • the second sheet 12 is arranged inside the disposable diaper 1, the raised portion 35 is formed inside the disposable diaper 1.
  • seat 11 is located in the outer side of the disposable diaper 1, a protruding part is not formed in the outer surface of the disposable diaper 1.
  • the exterior body 100 is formed by arranging the adhesive layer 13 on the first sheet 11 stretched at a constant stretch rate and bonding the adhesive layer 13 to the second sheet 12.
  • bonding at a constant elongation rate means bonding the second sheet 12 in a state where the high shrinkage stress region P1 and the low shrinkage stress region P2 of the first sheet 11 are stretched at the same elongation rate.
  • the adhesive layer 13 is disposed on the entire region corresponding to the waist portion 16 including the folded portion 20 as shown in FIG.
  • the second sheet 12 is overlaid on the first sheet 11 on which the adhesive layer 13 is disposed, and both are adhered by the adhesive layer 13.
  • the folded portion 20 extends from a region where the first sheet 11 and the second sheet 12 overlap each other, and the adhesive layer 13 is disposed on the folded portion 20.
  • the back side portion 16b and the abdominal side portion 16a are overlapped in a state where the extended state is maintained, and the corresponding side edge portions are joined to each other.
  • a seal portion 18 is formed.
  • the pants-type disposable diaper 1 is manufactured.
  • a series of raised portions 35 are formed inside in a natural state where no tension is applied from the outside.
  • the elongation recovery rate and elongation of the stretchable nonwoven fabric used for the first sheet 11 can be measured as follows.
  • the length is L1 after recovery.
  • the elongation recovery rate at 100% elongation is calculated from the following formula.
  • Elongation recovery rate at 100% elongation (%) ⁇ (L2-L1) / (L2-L0) ⁇ ⁇ 100 (Measurement method of elongation)
  • a sample piece having the same size as that of the sample piece used in the method for measuring the elongation recovery rate is stretched under the same conditions as the measurement of the elongation recovery rate, and the elongation at the time of breaking is defined as the elongation.
  • the disposable diaper 1 is placed on a desk in a natural state, and the circumference between the side seal portion 18 and a region sandwiched between the extension lines of a pair of side edges of the absorbent body 9 that defines the width direction of the absorbent body 9.
  • the width in the direction By measuring the width in the direction, the dimensional relationship in the circumferential direction between the first region 31 and the second region 32 in the exterior body 8 in the natural state can be seen.
  • the first region and the second region have the same circumferential dimension in the natural state. That is, the distance in the circumferential direction between the side seal portion 18 and the extension line of the side edge portion of the absorber 9 is equal.
  • “equal” means that the distance value in one region is within the range of 95% to 105% of the distance in the other region.
  • the preferable shrinkage stress value in the exterior body 8 is as follows.
  • the shrinkage stress of the first region 31 is preferably 1.4 cN / mm or more, more preferably 2 cN / mm or more, and preferably 5 cN / mm or less, and preferably 1.4 cN / mm or more and 5 cN / mm. mm or less, more preferably 2 cN / mm or more and 5 cN / mm or less.
  • the shrinkage stress of the second region 32 is preferably 0.1 cN / mm or more, more preferably 0.5 cN / mm or more, preferably 3 cN / mm or less, more preferably 2.5 cN / mm or less, And it is preferably 0.1 cN / mm or more and 3 cN / mm or less, more preferably 0.5 cN / mm or more and 2.5 cN / mm or less.
  • the shrinkage stress of the third region 33 is preferably 1.4 cN / mm or more, more preferably 1.5 cN / mm or more, preferably 4 cN / mm or less, more preferably 3.5 cN / mm or less, And it is preferably 1.4 cN / mm or more and 4 cN / mm or less, more preferably 1.5 cN / mm or more and 3.5 cN / mm or less.
  • these numerical values are suitably set according to the size of the disposable diaper according to the size of the wearer's body.
  • the shrinkage stress of the first region 31 is preferably 1.2 times or more, more preferably 1.4 times or more, and preferably 3 times or less, more preferably 2.5 times that of the second region 32. It is preferably 2 times or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.4 times or more and 2.5 times or less.
  • the shrinkage stress of the first region 31 is preferably 1.1 times or more, more preferably 1.5 times or more, and preferably 2.5 times or less, more preferably 2 times that of the third region 33. It is preferably 1 to 2.5 times, more preferably 1.5 to 2 times.
  • the dimensions in each region are preferably set as follows.
  • the length in the vertical direction of the first region 31 is preferably 1.0 times or more, more preferably 1.2 times or more, and preferably 2 times or less, more preferably the length of the second region 32. 1.8 times or less, and preferably 1.0 times or more and 2 times or less, more preferably 1.2 times or more and 1.8 times or less.
  • the length of the third region 33 in the vertical direction is preferably 1 ⁇ 2 or less of the length of the second region 32.
  • the length in the vertical direction of the third region 33 is preferably 0.5 cm or more, preferably 5 cm or less, more preferably 3 cm or less, still more preferably 1.5 cm or less, and preferably 0.5 cm. It is not less than 5 cm, more preferably not less than 0.5 cm and not more than 3 cm, further preferably not more than 0.5 to 1.5 cm. Specific dimensions differ depending on the size of the disposable diaper 1.
  • the shrinkage stress of the first to third regions 31 to 33 of the outer package 8 can be measured as follows. (How to make a sample for measuring shrinkage stress of exterior body) The side seal portion 18 of the disposable diaper 1 is peeled off, and the outer body 8 is elongated at the same ratio in any of the first to third regions 31 to 33 of the outer body 8, and is unfolded and spread on a plane. Cut each of the ventral side portion 16a and the back side portion 16b from the first to third regions 31 to 33 along a straight line parallel to the width direction and further cut along a straight line parallel to the front-rear direction. And cut out a rectangular sample.
  • the sample is a region other than the region facing the absorber 9 of the outer package 8 when seen in plan view, on the extension line of a pair of side edges of the absorber 9 that defines the width direction of the absorber 9 Cut out from the area outside the sandwiched area.
  • the sample in the stress release state naturally state
  • the sample in the stress release state is cut into a strip-like sample having a width of 70 mm along the width direction and 50 mm along the front-rear direction, and a sample having a width of 50 mm and a length of 70 mm create.
  • the length is changed as appropriate.
  • Both sides in the length direction (corresponding to the width direction in the disposable diaper) of the sample of each cut out region are fixed between a pair of chucks of the Tensilon tensile tester.
  • the sample is fixed by sandwiching a portion having a width of 10 mm from the edge at each of both end portions in the length direction of the sample.
  • the chuck interval is 50 mm, and the sample is fixed in a natural state (a state in which the sample is naturally contracted without applying an external force).
  • the chuck interval is appropriately adjusted according to the length of the sample piece.
  • the sample was stretched at 300 mm / min in the same direction as the diaper width direction (sample length direction), and the sample length (distance between chucks) was 185% of the length in the natural state.
  • the tensile load (cN) per unit length (1 mm) in the width direction when contracted to a length of 140% after extending to the time is defined as the contraction stress.
  • the reason why 140% is used as an index is to reproduce the stretched state of the sample when the pants-type disposable diaper 1 is worn.
  • the thickness of the elastic fiber of the elastic filament 42a used in the first region 31 is preferably 20 ⁇ m or more, more preferably 40 ⁇ m or more, preferably 400 ⁇ m or less, more preferably 300 ⁇ m or less, and preferably 20 ⁇ m. It is 400 ⁇ m or less, more preferably 40 ⁇ m or more and 300 ⁇ m or less.
  • the thickness of the elastic fiber of the elastic filament 42b used in the second region 32 is preferably 10 ⁇ m or more, more preferably 20 ⁇ m or more, preferably 300 ⁇ m or less, more preferably 250 ⁇ m or less, and preferably 10 ⁇ m.
  • the thickness of the elastic fiber used for the first region 31 is preferably 1.2 or more, more preferably 1.5 times or more, and preferably 3 times the thickness of the elastic fiber used for the second region 32. It is not more than twice, more preferably not more than 2.5 times, and preferably not less than 1.2 times and not more than 3 times, more preferably not less than 1.5 times and not more than 2.5 times.
  • the thickness of the elastic fiber corresponds to the fiber diameter of the elastic fiber.
  • the first sheet 11 for imparting stretchability to the composite sheet 10 constituting the abdominal side portion 16a and the back side portion 16b is a single piece seamlessly in the vertical direction. It has a configuration in which regions of different shrinkage stress exist. Thereby, the disposable diaper 1 which has the appearance and touch like underwear of uniform underwear like a cloth without a cut
  • both the high contraction stress region P1 corresponding to the first region 31 of the first sheet 11, the low contraction stress region P2 corresponding to the second region 32 and the third region 33 are constant.
  • the outer sheet 8 is manufactured by pasting the second sheet 12 in a state where the outer sheet 8 is stretched at a stretch rate of. Thereby, the exterior body 8 at the time of expansion
  • the second region 32 located above the waist portion 16 and the first region 31 located below the third region 33 are configured to have higher contraction stress. Therefore, it is possible to effectively prevent the disposable diaper 1 from slipping off during wearing. Wearers, especially infants, have a waist that stretches out as a physical feature of the wearer. The waist part of the diaper is gradually narrowed down, and the waist part tends to be shifted to a site where the abdomen becomes thinner.
  • the first region 31 having a high contraction stress is provided on the lower side of the waist portion 16 so that a region where the tightening force of the waist portion 16 is relatively high comes into contact with a portion where the waistline is narrowed. It is possible to effectively prevent slipping during wearing. In order to effectively prevent such slipping during wearing, the second region 32 and the third region 33 located on the upper side of the waist portion 16 and the first region 31 located on the lower side It is preferable that the relationship between the shrinkage stress is in the above-described range.
  • the abdominal side part 16a and the back side part 16b are comprised so that it may be provided with the area
  • the disposable diaper 1 having a function as a diaper, a good fit, and an appearance and a touch like an underwear pant with a uniform texture like a fabric can be obtained.
  • the vicinity of the opening peripheral edge 15 of the waist opening 7 corresponds to the third region 33.
  • the third region 33 has a higher contraction stress than the second region 32 located immediately adjacent to the third region 33, and has a lower contraction stress than the first region 31. Yes.
  • rubber is used at the waist.
  • the wearer is given a moderate tightening feeling at the waist opening end when worn, like underwear pants. A comfortable wearing feeling can be given to the wearer.
  • the waist opening 7 of the disposable diaper 1 is widened by an operator during wearing work, and when the leg is passed through the leg opening 14, etc. A feeling can be given to the worker.
  • the length of the third region 33 in the front-rear direction within the above range, it is possible to give the wearer a feeling of wearing close to that of general underwear pants in which rubber is used for the waist. .
  • the raised portions 35 form a series of patterns across the first region 31 and the second region 32 in the ventral side portion 16a and the dorsal side portion 16b.
  • a seamless pattern is formed without interruption, and the disposable diaper 1 having an appearance and a tactile sensation like underwear of uniform underwear such as a fabric is obtained.
  • each raised portion 35 forms a hollow portion extending along the vertical direction together with the first sheet 11.
  • the raised portion 35 forms a hollow portion extending along the vertical direction also between each raised portion 35 and the skin (outside the raised portion 35).
  • the hollow portion formed inside and outside the raised portion 35 can function as an air passage through which air flows, and can make the composite sheet 10 excellent in cushioning properties and air permeability.
  • an adhesive layer is provided on the ventral portion and the dorsal portion as in the first embodiment.
  • a composite sheet composed of a first sheet and a second sheet pasted together is used, and a composite sheet having a contraction stress distribution similar to that of the first embodiment is used for the waist portion of the exterior body. Yes.
  • region which have mutually different shrinkage stress in the up-down direction similarly to 1st Embodiment is comprised by one sheet of elastic nonwoven fabric seamlessly Has been.
  • the second region located above the waist and the first region located below the third region are configured to have higher contraction stress. Therefore, it is possible to effectively prevent the slippage during wearing of the disposable diaper.
  • the contraction stress of the third region may be the same as that of the first contraction region, and the first region positioned below the second region positioned relatively above is relatively low. Since the contraction stress becomes higher, it is possible to effectively prevent slipping during wearing. Also in the following embodiment, by providing a third region having a higher contraction stress than the second region, the wearer is given a moderate tightening feeling at the end of the waist opening when worn, and is worn like underwear A feeling can be given. In addition, by providing the third region, the waist opening of the disposable diaper is widened by the worker during wearing work, and when the leg is passed through the leg opening portion, etc., the operator feels like stretching underwear. Can do.
  • the raised portions formed by the second sheet form a series of patterns across the first region and the second region.
  • a smooth pattern is formed on the abdominal side and the back side without interruption, and a disposable diaper having an appearance and a tactile sensation like underpants with uniform texture like fabric can be obtained.
  • FIG. 8 illustrates a state in which the folded portion 20 is not expanded.
  • the disposable diaper 2 shown in FIG. 1 includes an exterior body 28 and an absorber 9.
  • the disposable diaper 2 of the present embodiment has a configuration in which an elastic body 29 is added to the configuration of the disposable diaper 1 shown in the first embodiment.
  • the elastic body 29 is disposed in the third region 33.
  • a thread-like one such as a thread rubber having a rectangular, circular or polygonal cross section, a string-like one such as a flat rubber, or the like can be used.
  • the elastic body 29 is disposed along the circumferential direction of the trunk in the folded composite sheet (elastic sheet) 10 in the third region 33.
  • the abdominal side portion 16a and the dorsal side portion When the elastic body 29 is in a natural state in which no tension is applied, the abdominal side portion 16a and the dorsal side portion have a length equal to or greater than the width of each of the abdominal side portion 16a and the back side portion 16b in the natural state. Each 16b is arranged over the entire length along the circumferential direction.
  • the wrinkle by the elastic body 29 does not generate
  • the elastic body 29 causes the end on the side of the waist opening 7.
  • the disposable diaper 2 having a stable quality can be obtained. Further, when the disposable diaper 2 is worn, the elastic body 29 is stretched to give the wearer a feeling of tightening. Thereby, a feeling of use like underwear can be given to a wearer.
  • the adhesive layer has a pattern in which a plurality of adhesive portions that continuously extend in the vertical direction are arranged at equal intervals in the width direction.
  • the layer pattern is not limited to this.
  • a plurality of adhesive portions are arranged at intervals in the circumferential direction, and span the first region 31 and the second region 32. It may be arranged continuously or discontinuously along one direction.
  • the plurality of raised portions formed by the second sheet 12 form a series of patterns, and a smooth pattern is formed without interruption in the entire ventral region and the dorsal region.
  • the following third to sixth embodiments differ only in that the pattern of the adhesive layer is different from that of the first embodiment, and thus the shape of the pattern formed by the raised portions is different.
  • the explanation will focus on the pattern shape of the layer.
  • explanation will be given using a plan view showing an unfolded state of the exterior body of the disposable diaper. In these plan views, all the side seal portions of the disposable diaper shown in FIG. 1 are peeled off. Thus, the abdomen and the dorsal side are separated, and the exterior body is extended along the XY plane. Further, in the plan view of the exterior body, in order to explain the arrangement pattern of the adhesive layer constituting a part of the exterior body, the second sheet is not shown, and only the first sheet and the adhesive layer are illustrated. ing.
  • the disposable diaper 3 which concerns on this embodiment is demonstrated using FIG.1 and FIG.9.
  • the disposable diaper 3 illustrated in FIG. 1 includes an exterior body 38 and an absorber 9.
  • the exterior body 38 shown in FIG. 9 is comprised from the waist part 36 and the crotch part 37 which were formed in a series, and the waist part 36 has the abdominal side part 36a and the back side part 36b.
  • the exterior body 38 includes the first sheet 11 and the second sheet 12 that are bonded together via the adhesive layer 22.
  • the adhesive layer 22 is arranged between the first sheet 11 and the second sheet 12, and is composed of a plurality of elongated strip-shaped adhesive portions 25 that extend continuously in the width direction with an equal width.
  • the plurality of bonding portions 25 all have the same width and are spaced apart from each other at equal intervals in the vertical direction.
  • the adhesive portions 25 are arranged in a series of patterns over the entire length in the width direction of the abdominal side portion 36a and the back side portion 36b provided with the stretchable region of the exterior body 38.
  • the disposable diaper 3 in the present embodiment has a plurality of raised portions formed by the second sheet 12 swelled in a direction away from the first sheet 11 between the adjacent 25 rows of adhesive portions.
  • the raised portions extend in the width direction and are spaced apart at equal intervals in the vertical direction, and form a uniform pattern of wrinkles on the inside of the waist portion 36 of the exterior body 38.
  • the disposable diaper 4 which concerns on this embodiment is demonstrated using FIG.1 and FIG.10.
  • the disposable diaper 4 shown in FIG. 1 includes an exterior body 48 and an absorber 9.
  • the exterior body 48 shown in FIG. 10 includes a waist part 46 and a crotch part 47 formed in series, and the waist part 46 has a ventral side part 46a and a back side part 46b.
  • the exterior body 48 includes the first sheet 11 and the second sheet 12 that are bonded together via the adhesive layer 23.
  • the adhesive layer 23 includes a plurality of adhesive portions 26 disposed between the first sheet 11 and the second sheet 12.
  • the plurality of adhesive portions 26 have an elongated strip shape that continuously extends with an equal width in an oblique direction with respect to the width direction and the vertical direction.
  • the plurality of bonding portions 26 all have the same width and are spaced apart from each other at equal intervals.
  • the bonding portions 26 are arranged in a series of patterns over the entire region of the abdomen side 46a and the entire region of the back side 46b provided with the stretchable region of the exterior body 48.
  • the disposable diaper 4 has a plurality of raised portions formed by the second sheet 12 swelled in a direction away from the first sheet 11 between adjacent rows of the adhesive portions 26.
  • each ridge extends diagonally in the circumferential direction and the up-down direction at an equal width, and a plurality of the ridges are arranged at regular intervals.
  • the bonding portion 26 has a shape that extends continuously on a straight line in an oblique direction, but is not limited thereto.
  • an adhesive portion group in which a plurality of adhesive portions are discontinuously arranged on a straight line in an oblique direction may be configured, and a plurality of the adhesive portion groups may be intermittently disposed in the circumferential direction to constitute an adhesive layer. .
  • the disposable diaper 5 which concerns on this embodiment is demonstrated using FIG.1 and FIG.11.
  • the disposable diaper 5 shown in FIG. 1 includes an exterior body 58 and an absorbent body 9.
  • the exterior body 58 shown in FIG. 11 is comprised from the waist part 56 and the crotch part 57 which were formed in series, and the waist part 56 has the abdominal side part 56a and the back side part 56b.
  • the exterior body 58 includes the first sheet 11 and the second sheet 12 that are bonded together via the adhesive layer 24.
  • the adhesive layer 24 is arranged between the first sheet 11 and the second sheet 12 and is composed of a plurality of adhesive portion groups 27 that are arranged at equal intervals in the circumferential direction of the trunk. .
  • Each adhesion part group 27 is comprised from the some adhesion part 27a arrange
  • the bonding portion group 27 is configured by disposing a plurality of bonding portions 27a discontinuously on a straight line along the vertical direction.
  • the disposable diaper 5 in the present embodiment has a plurality of raised portions formed by the second sheet 12 swelled in a direction away from the first sheet 11 between the 27 rows of adjacent adhesive portion groups. Each raised portion is arranged in a matrix.
  • the plurality of raised portions in the abdominal side portion 56a and the back side portion 56b have good air permeability because the hollow portions thereof communicate with each other in space.
  • the disposable diaper 6 which concerns on this embodiment is demonstrated using FIG.1 and FIG.12.
  • the disposable diaper 6 shown in FIG. 1 includes an exterior body 68 and an absorber 9.
  • the exterior body 68 shown in FIG. 12 is comprised from the waist part 66 and the crotch part 67 which were formed in series, and the waist part 66 has the abdominal side part 66a and the back side part 66b.
  • the exterior body 68 includes a first sheet 11 and a second sheet 12 that are bonded together via an adhesive layer 63.
  • the adhesive layer 63 includes a plurality of adhesive portions 64 arranged in a staggered manner between the first sheet 11 and the second sheet 12.
  • the plurality of bonding portions 64 are intermittently arranged with a space therebetween in the circumferential direction of the body, and are also intermittently disposed with a space in the vertical direction.
  • the plurality of bonding portions 64 are discontinuously arranged along the vertical direction.
  • the zigzag pattern refers to an arrangement in which the adhering portions are staggered between adhering portion groups in which a plurality of adjacent adhering portions 64 are discontinuously arranged along the vertical direction.
  • the disposable diaper 6 has a plurality of raised portions formed by the second sheet 12 swelled in a direction away from the first sheet 11 between the adjacent adhesive portions 64 in a natural state.
  • the plurality of raised portions are arranged in a staggered manner.
  • the disposable diaper 6 is provided with a plurality of raised portions almost uniformly in both the width direction and the vertical direction in the entire region of the abdominal side portion 66a and the back side portion 66b. It can be.
  • the present invention is not limited to these patterns.
  • An example in which they are arranged at equal intervals in the circumferential direction has been given.
  • the arrangement interval of the adhesion part or the adhesion part group arranged on both side parts in the width direction close to the side seal part is arranged in the center part in the width direction.
  • the arrangement interval may be changed stepwise or continuously narrowing from the central part of each of the back side part and the abdominal side part toward both side parts.
  • the plurality of raised portions by the second sheet form a series of patterns over the high shrinkage stress region P1 and the low shrinkage stress region P2.
  • a smooth pattern is formed from the high contraction stress region P1 to the low contraction stress region P2 in the whole ventral region and the back side region.
  • the present invention is not limited to this.
  • the arrangement interval of the elastic filaments may be varied.
  • the elastic filament 62 which comprises elastic resin is also in the 1st area
  • the elastic fibers have the same thickness, for example, elastic fibers having a thickness of 100 ⁇ m here.
  • the plurality of elastic filaments 62a used in the first region 31 and the plurality of elastic filaments 62b used in the second region 32 extend along the circumferential direction and are spaced apart from each other in the vertical direction. .
  • the arrangement interval of the elastic filaments 62 a in the first region 31 is narrower than the arrangement interval of the elastic filaments 62 b in the second region 32. Thereby, the shrinkage stress of the first region 31 can be made higher than that of the second region 32.
  • the arrangement interval of the elastic filaments 62a arranged in the first region 31 is preferably 0.2 mm or more, more preferably 0.5 mm or more, and preferably 2.5 mm or less, more preferably 2 mm or less, and The thickness is preferably 0.2 mm or more and 2.5 mm or less, more preferably 0.5 mm or more and 2 mm or less.
  • the arrangement interval of the elastic filaments 62b arranged in the second region 32 is preferably 0.5 mm or more, more preferably 0.8 mm or more, and preferably 5.0 mm or less, more preferably 3.0 mm or less. And preferably it is 0.5 mm or more and 5.0 mm or less, More preferably, it is 0.8 mm or more and 3.0 mm or less.
  • the arrangement interval of the elastic filaments 62b arranged in the second region 32 is preferably 1.2 times or more, more preferably 1.5 times or more of the arrangement interval of the elastic filaments 62a arranged in the first region 31. Further, it is preferably 3 times or less, more preferably 2.5 times or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.5 times or more and 2.5 times or less.
  • the contraction stress of the first region 31 can be made higher than that of the second region 32.
  • the weight per unit area of the elastic resin disposed in the first region 31 is preferably 5 g / m 2 or more, more preferably 7 g / m 2 or more, and preferably 15 g / m 2 or less, more preferably 12 g. / M 2 or less, and preferably 5 g / m 2 or more and 15 g / m 2 or less, more preferably 7 g / m 2 or more and 12 g / m 2 or less.
  • the weight per unit area of the elastic resin disposed in the second region 32 is preferably 4 g / m 2 or more, more preferably 5 g / m 2 or more, and preferably 12 g / m 2 or less, more preferably 10 g. / M 2 or less, and preferably 4 g / m 2 or more and 12 g / m 2 or less, more preferably 5 g / m 2 or more and 10 g / m 2 or less.
  • the weight per unit area of the elastic resin used for the first region 31 is preferably 1.2 times or more, more preferably 1.5 times or more, and preferably 3 times or less, more preferably that of the second region 32.
  • the ratio is preferably 2.5 times or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.5 times or more and 2.5 times or less.
  • the contraction stress in the first region 31 is made higher than that in the second region 32.
  • the density of the plurality of elastic fibers constituting the elastic resin used in the first region 31 is preferably 1.2 times or more, more preferably 1.5 times or more, and preferably 3 times that of the second region 32. Hereinafter, it is more preferably 2.5 times or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.5 times or more and 2.5 times or less.
  • the adhesive layer is provided so that the raised portions form a series of patterns.
  • the first sheet is stretched at a constant stretch rate to generate the second sheet.
  • the sheets may be bonded together, and the adhesive layer may not be provided so that the raised portions are formed in a series of patterns.
  • the exterior body By producing the exterior body by stretching the first sheet at a constant elongation rate and bonding it to the second sheet, it is like underwear underwear with a uniform texture over a plurality of regions where the shrinkage stress of the exterior body is different Disposable diapers with appearance and feel can be obtained.
  • the exterior body was comprised using the 1st sheet
  • both the abdominal side part and the back side part of the waist part had the expansion-contraction area
  • stacked is used for the waist part of the exterior body of the above-mentioned embodiment, and it applies to a disposable diaper
  • the folded portion where the first sheet is folded is provided at the opening peripheral edge of the waist opening portion.
  • the folded portion may not be provided.
  • the exterior body is composed of a composite sheet obtained by laminating a first sheet (elastic sheet) and a second sheet (non-elastic sheet) having the same external shape.
  • the folded portion may or may not be provided.
  • the folded portion is not provided, for example, when the adhesive layer pattern is as in the first, fourth, fifth, and sixth embodiments, the raised portion is at the opening peripheral edge of the waist opening, together with the first sheet. Form an opening.
  • the air which flows through the inside of the raised part which has a hollow shape becomes easy to flow through the opening formed by the raised part to the outside of a disposable diaper, and becomes more excellent in air permeability.
  • a part of the elastic element of the stretchable sheet in the region facing the waist absorber may be cut or removed to form a non-stretchable region.
  • the pant-type absorbent article according to the present invention may not be a pant-type disposable diaper that is formed in a pant shape in advance by being joined at the side seal portion as in the above embodiment. That is, the pant-type absorbent article according to the present invention is a tape-type disposable diaper that is provided with a tape such as a hook-and-loop fastener instead of the side seal part, and becomes a pant shape by attaching the tape together when worn. Also good.
  • the pants-type absorbent article according to the present invention may not be a disposable diaper for infants, and may be a disposable diaper for adults or children, for example. Furthermore, the pants-type absorbent article according to the present invention may not be a disposable diaper as long as it is an absorbent article of the type worn on the lower body. Examples of such a pants-type absorbent article include a pants-type sanitary napkin and a pants-type urine leak pad.
  • the stretchable sheet according to the present invention is a continuous sheet having a plurality of regions in which tensile stress due to shrinkage (hereinafter referred to as shrinkage stress) is different from each other in the plane direction.
  • shrinkage stress tensile stress due to shrinkage
  • means for forming a sheet having a plurality of regions having different tensile stresses due to shrinkage include means for joining and forming sheets of different members having different shrinkage stresses. Since the stretchable sheet according to the present invention is not formed by joining a plurality of separate sheets, the stretchable sheet not only has excellent strength against external forces such as contact of an object to the stretchable sheet and gripping by a handler, but also overall It has an appearance with a sense of unity.
  • the joints are not provided in order to prevent the shrinkage from being restricted in the vicinity of the joints when they are joined together and to prevent distortion such as wrinkles in the stretchable sheet.
  • the contraction stress is a tensile stress due to contraction when the stretchable sheet contracts when the stretchable sheet in a natural state is stretched to return to its original state.
  • the natural state refers to a state in which the stretchable sheet is left on a horizontal surface without applying an external force that causes deformation such as expansion or crushing unless otherwise specified.
  • Such an elastic sheet is suitable for an exterior body of a pants-type disposable diaper, which is an absorbent article that requires elasticity around the waist, for example.
  • the elastic sheet 70 includes a plurality of elastic filaments 87a, and two layers of a first nonwoven fabric 85 and a second nonwoven fabric 86 that are arranged to face each other via the elastic filaments 87a.
  • the plurality of elastic filaments 87 a can be expanded and contracted in the first direction (Y-axis direction) and constitutes an elastic layer 87.
  • the elastic sheet 87 can be expanded and contracted in the Y-axis direction by a plurality of elastic filaments 87a.
  • the Y-axis direction corresponds to the expansion / contraction direction of the elastic sheet 70.
  • the Z-axis direction corresponds to the thickness direction of the stretchable sheet 70.
  • the X-axis direction as the second direction corresponds to a direction orthogonal to the expansion / contraction direction and the thickness direction.
  • the 1st nonwoven fabric 85 and the 2nd nonwoven fabric 86 are not limited to a specific kind, For example, it can select from an air through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spun bond nonwoven fabric, a melt blown nonwoven fabric, etc.
  • the fiber which comprises a nonwoven fabric is not limited to a specific kind, For example, it can select from chemical fibers, such as polyethylene, a polypropylene, polyester, polyamide.
  • the nonwoven fabric may be comprised with the composite fiber containing several types of chemical fiber.
  • natural fibers such as cotton and silk may be blended in the fibers constituting the nonwoven fabric.
  • the first nonwoven fabric 85 and the second nonwoven fabric 86 are the same kind of nonwoven fabric.
  • the elastic filament 87a is a thread-like elastic body that extends along the Y-axis direction.
  • a plurality of elastic filaments 87a are arranged at equal intervals in the X-axis direction orthogonal to the Y-axis direction.
  • the elastic filaments 87a are welded directly to the first nonwoven fabric 85 and the second nonwoven fabric 86, respectively. That is, the elastic filament 87a, the first nonwoven fabric 85, and the second nonwoven fabric 86 are joined without using an adhesive or the like.
  • the elastic filament 87a It is not exposed on the surface and is enclosed in the nonwoven fabric layer, and the stretchable sheet 70 is configured to be stretchable independently.
  • the elastic filament 87a is formed of an elastic material such as a thermoplastic elastomer, for example.
  • the elastic filament 87a is preferably formed of a thermoplastic elastomer that is easily fused to the fibers constituting the nonwoven fabric.
  • a thermoplastic elastomer forming the elastic filament for example, a styrene elastomer, an olefin elastomer, a polyester elastomer, a polyurethane elastomer, or the like can be used.
  • the elastic filament can also be formed by combining a plurality of types of thermoplastic elastomers. Further, the elastic filament may be a core-sheath type or side-by-side type composite fiber.
  • the elastic filament 87a is wave-shaped in a natural state.
  • the elastic sheet 70 also has a wave shape along the wave shape of the elastic filament 87a.
  • the boundary surface between the first nonwoven fabric 85 and the second nonwoven fabric 86 is corrugated along the corrugated shape of the elastic filament 87a.
  • the corrugated elastic sheet 70 has a corrugated shape in which top portions 81 located on the first nonwoven fabric 85 side and trough portions 82 located on the second nonwoven fabric 86 side are alternately arranged.
  • the top part 81 and the trough part 82 are connected via the wall part 83.
  • the first nonwoven fabric 85 (second nonwoven fabric 86) has a plurality of convex portions 74 (71) and a plurality of flat portions 75 (72) made of fibers constituting the nonwoven fabric.
  • the convex portions 74 (71) and the flat portions 75 (72) respectively extend in the X-axis direction and extend in the Y-axis direction. A plurality of them are alternately arranged along.
  • the boundary surface between the first nonwoven fabric 85 and the second nonwoven fabric 86 is a wave shape in a natural state is described as an example, but it may be a planar shape.
  • the elastic sheet exhibits a form as shown in FIG. 16 in a natural state.
  • the convex portion 74 and the convex portion 71 are located on the wall portion 83 of the corrugated elastic sheet 70.
  • the flat part 75 and the flat part 72 are located in the top part 81 or the trough part 82 of the wave-shaped elastic sheet 70.
  • the expansion-contraction sheet 70 takes a wave shape, Therefore
  • the contact area between the skin of the wearer of the disposable diaper and the stretchable sheet 70 can be reduced, and stuffiness and rash can be effectively prevented.
  • the difference between the length of the stretchable sheet 70 in the natural state in the Y-axis direction and the length of the extension temple can be increased, the disposable diaper can be applied to a wide variety of body wearers.
  • the fibers constituting the convex portions 74 and the convex portions 71 are fibers that are plastically deformed by a roll stretching process, which will be described later, and are still stretched by the roll stretching process, and are separated from the elastic filaments 87a by the roll stretching process.
  • the fibers constituting the flat portion 75 and the flat portion 72 are fibers that are not plastically deformed by a roll drawing process described later.
  • the convex portion 74 (71) forms the stretchable portion of the first nonwoven fabric 85 (second nonwoven fabric 86)
  • the flat portion 75 (72) forms the joint portion of the first nonwoven fabric 85 (second nonwoven fabric 86). To do.
  • the stretchable part and the connecting part will be described later.
  • the fiber density of the convex portion 74 (71) is relatively lower than that of the flat portion 75 (72).
  • it is configured such that the convex portion 71 on the other surface is positioned at the position of the convex portion 74 on one surface of the stretchable sheet 70, and at the position of the flat portion 75 on one surface,
  • the flat portion 72 on the other surface is configured to be positioned.
  • the convex part 74 and the convex part 71 have a substantially surface-target shape at the boundary surface between the first nonwoven fabric 85 and the second nonwoven fabric 86.
  • region used as each connection part of the 1st nonwoven fabric 85 and the 2nd nonwoven fabric 86 is also located facing in the thickness direction of the expansion-contraction sheet 70.
  • the expansion-contraction part in both the nonwoven fabrics is made into the expansion-contraction sheet 70, without distinguishing the expansion-contraction part in a 1st nonwoven fabric 85, a connection part, and the expansion-contraction part in a 2nd nonwoven fabric 86, respectively.
  • the connecting part in both nonwoven fabrics will be referred to as the connecting part 70b in the elastic sheet 70 and will be described.
  • Part of the fibers constituting the first non-woven fabric 85 (second non-woven fabric 86) is peeled off from the elastic filament 87a and plastically deformed. Part 71).
  • This convex part 74 (convex part 71) becomes an extension allowance part at the time of expansion
  • FIG. The region where the plastically deformed nonwoven fabric fibers are arranged becomes the stretchable portion 70 a of the stretchable sheet 70.
  • the convex part 74 and the convex part 71 comprise the expansion-contraction part 70a which can be expanded-contracted in a Y-axis direction.
  • the fibers constituting the first nonwoven fabric 85 are fibers that have hardly changed from the length before the roll stretching process, A flat portion 75 (72) is formed.
  • Such a region where the nonwoven fabric fibers that are not plastically deformed are arranged becomes the joint portion 70 b of the stretchable sheet 70.
  • the flat part 75 and the flat part 72 constitute a connecting part 70b that is less likely to expand and contract in the Y-axis direction than the expandable part 70a.
  • region per unit area of the elastic filament 87a and the 1st nonwoven fabric 85 (2nd nonwoven fabric 86) has fewer directions in the expansion-contraction part 70a rather than the connection part 70b.
  • a plurality of stretchable portions 70a and connecting portions 70b extending in the X-axis direction are intermittently arranged along the Y-axis direction and alternately arranged.
  • a plurality of connecting portions 70b are intermittently arranged along the Y-axis direction, and extend along the X-axis direction.
  • the connection part 70b is arrange
  • a force for stretching in the Y-axis direction is applied, so that the stretchable sheet 70 stretches mainly in the Y-axis direction.
  • the stretchable elastic sheet 70 is not substantially stretched at the joint portion 70b.
  • the stretchable stretchable sheet 70 may be stretched in the connecting portion 70b as long as the stretched stretchable sheet 70 is smaller than the stretchable portion 70a.
  • the elastic sheet 70 is contracted in the Y-axis direction by the elastic force of the elastic filament 87a when the force for extending in the Y-axis direction is released from the extended state.
  • the dimension of the stretchable portion 70a in the Y-axis direction is smaller than that of the stretched stretchable sheet 70.
  • the stretchable sheet 70 itself can be stretched and contracted by the elastic force of the elastic filament 87a without using an elastic body such as thread rubber.
  • the elastic filament 87a is not stretched and is in a contracted state.
  • the fibers constituting the first non-woven fabric 85 (second non-woven fabric 86) form convex portions 74 (71) by the stretchable portions 70a, and the convex portions 74 (71) protrude in directions away from the elastic filaments 87a. Yes.
  • the fibers of the first nonwoven fabric 85 constituting the convex portion 74 and the fibers of the second nonwoven fabric 86 constituting the convex portion 71 are as follows.
  • connection part 70b since the fiber of the nonwoven fabric located in the connection part 70b is not plastically deformed, it is difficult to elongate.
  • each convex portion 74 (71) has a high convex portion 74b (71b) as a second convex portion and a low convex portion 74a (71a) as a first convex portion, the heights of which are different from each other along the X-axis direction. And have. As shown in FIG.15 and FIG.16, the high convex part 74b (71b) is higher than the low convex part 74a (71a), and the fiber density is low.
  • the high convex portions 74b (71b) and the low convex portions 74a (71a) having different fiber densities are formed by adjusting the amount of meshing of the tooth grooves at the time of roll stretching using the tooth groove stretching roll. be able to. The manufacturing method will be described later.
  • the stretchable portion 70a of the stretchable stretchable sheet 70 when the stretchable sheet 70 is stretched, the stretched portion is pulled out so as to be straightened along with the stretch of the elastic filament 87a. That is, the higher the height of the convex portion, the larger the amount of elongation at the time of extension.
  • the expansion / contraction part 70a where the high convex part 74b (71b) is located has a larger elongation amount than the elastic part 70a where the low convex part 74a (71a) is located.
  • the region where the high convex portion 74b (71b) is located and the region where the low convex portion 74a (71a) is located differ in the possible amount of elongation during elongation. That is, the region where the high convex portion 74b (71b) is located becomes easier to extend than the region where the low convex portion 74a (71a) is located.
  • the region in which the low convex portion 74a (71a) is located is higher than the region in which the high convex portion 74b (71b) is located.
  • the region where the plurality of high convex portions 74b (71b) extending in the X-axis direction are spaced apart from each other in the Y-axis direction is a low shrinkage stress region P2.
  • a region where the plurality of low convex portions 74a (71a) extending in the X-axis direction are arranged apart from each other in the Y-axis direction constitutes a high contraction stress region P1.
  • a plurality of elastic filaments 87a are arranged at equal intervals.
  • a low shrinkage stress region P2 a high shrinkage stress region P1, and a low shrinkage stress region P2 are sequentially arranged along the X-axis direction.
  • the stretchable sheet 70 is a sheet having a higher contraction stress in the central region in the X-axis direction than in other regions. Accordingly, as shown in FIG. 19, when the stretchable sheet 70 is stretched at a uniform stretch rate in the Y-axis direction, the stretchable sheet 70 is easily stretched in the upper and lower portions in the X-axis direction, and the central portion is difficult to stretch. For this reason, the central portion in the X-axis direction is constricted.
  • the first nonwoven fabric 85 will be described as an example with reference to FIG. 21, but the second nonwoven fabric 86 has the same configuration as the first nonwoven fabric 85.
  • the first nonwoven fabric 85 is formed by, for example, a spunbond method, embossed, and has a plurality of heat fusion portions 61.
  • the heat-sealed portion 61 is formed in a constant pattern over the entire surface of the first nonwoven fabric 85, and thereby, a uniform touch can be achieved throughout the surface.
  • fusion part in this invention means the location where the fibers in a nonwoven fabric are heat-seal
  • the point that fibers are fused by hot air in the air-through nonwoven fabric is also a heat-sealed portion in the present invention.
  • the heat fusion part 61 is also thermally fused on the boundary 69 between the high shrinkage stress region P1 and the low shrinkage stress region P2 of the first nonwoven fabric 85.
  • the parts 61 may be arranged apart from each other.
  • a part non-existing region 65 is assumed.
  • Each side of the rectangular heat-sealed portion non-existing region 65 is parallel to a boundary 69 (extending in the Y-axis direction) or a virtual line orthogonal to the boundary 69 (extending in the X-axis direction), It is in contact with the heat fusion part 61. It is desirable that the heat-fused portion nonexistent region 65 has a length in the X-axis direction that is longer than a length in the Y-axis direction. Thereby, the material destruction of the 1st nonwoven fabric 85 can be made hard to produce.
  • a heat-sealed part (embossed part) by embossing has a smaller thickness than a region other than the embossed part, and there is a step near the edge of the embossed part. Further, the embossed portion is deteriorated and easily broken by the influence of heat, and the edge of the embossed portion tends to be a starting point of material destruction.
  • a force in the shearing direction acts on the boundary 69 between the high shrinkage stress region P1 and the low shrinkage stress region P2.
  • the length in the X-axis direction of the heat fusion part non-existence region 65 is made longer than the length in the Y-axis direction, thereby changing the length in the Y-axis direction to the X-axis.
  • the amount of displacement at the time of extension can be reduced as compared with the case where the length is longer than the length in the direction. Therefore, sufficient strength can be obtained in the vicinity of the boundary 69 where the material is likely to be loaded due to the expansion of the stretchable sheet 70 without using another support for ensuring the strength.
  • region 65 should just be longer than the Y-axis direction at least one of the 1st nonwoven fabric 85 and the 2nd nonwoven fabric 86.
  • the stretching device 90 includes a pair of tooth gap stretching rolls 91 and 92.
  • stretching apparatus 90 has is connected to the drive means (not shown) which drives them.
  • Each roll is rotated by the driving means.
  • a plurality of teeth 79 (80) are provided radially from the rotation axis on the peripheral surface of the tooth gap extending roll 91 (92) in a direction orthogonal to the rotation direction of the roll, and the plurality of teeth along the rotation direction. Uneven portions are formed.
  • the laminated body 70 ′ is a base material between two first non-processed nonwoven fabrics (reference numeral 85 ′ in FIG. 24 described later) and a second nonwoven fabric before processing (reference numeral 86 ′ in FIG. 24 described later).
  • the elastic filament 87a heated is supplied and laminated by applying pressure.
  • the elastic filament 87 a is directly welded to the first nonwoven fabric 85 ′ and the second nonwoven fabric 86 ′ before processing by the heat of the melt-spun elastic filament 87 a.
  • the first non-woven fabric 85 ′ and the second non-woven fabric 86 ′ each have a plurality of heat-sealing portions 61.
  • the laminated body 70 ′ is sandwiched between a pair of tooth gap extending rolls 91 and 92, and is sent by the rotation of the tooth gap extending rolls 91 and 92.
  • a tooth 79 extending from one tooth gap extending roll 91 and a groove extending from the tooth groove extending roll 92 that opposes the teeth 79; and a tooth 80 extending from the tooth groove extending roll 92 that engages the teeth 80 facing the teeth.
  • a roll stretching process is performed by passing the laminated body 70 ′ between them.
  • the tooth 79 (80) has a high tooth portion 77b (78b) and a low tooth portion 77a (78a) whose tooth depth is lower than that of the high tooth portion 77b (78b). Have.
  • the tooth 79 (80) has a low toothed portion 77a (78a) located in a central portion that is equally divided into three along an axial direction orthogonal to the rotation direction, and this low toothed portion 77a (78a). ) Are located on both sides, and the tooth 79 (80) has a lower tooth depth in the central portion along the axial direction.
  • the region where the low toothpick portion 77a of the tooth 79 is located and the region where the low toothpaste portion 78a of the tooth 80 is located, the region where the high toothpaste portion 77b of the tooth 79 is located and the high toothpaste portion 78b of the tooth 80 are located. The regions are opposed to each other by roll stretching.
  • the raw fabric roll 76 by which laminated body 70 'is wound up is rotatably provided in the upstream of the tooth gap extending rolls 91 and 92 in the extending
  • a pair of infeed rolls 93 is provided between the raw roll 76 and the tooth gap extending rolls 91 and 92.
  • the rotation speed of the infeed roll 93 By adjusting the rotation speed of the infeed roll 93, the supply speed of the laminated body 70 ′ supplied between the tooth gap extending rolls 91 and 92 is adjusted.
  • the laminated body 70 ′ can be supplied between the tooth gap extending rolls 91 and 92 in a state where tension is applied by the pair of infeed rolls 93 and the tooth groove extending rolls 91 and 92.
  • a pair of outfeed rolls 94 is provided on the downstream side of the tooth gap extending rolls 91 and 92.
  • the feed speed of the stretchable sheet 70 fed from between the tooth gap extending rolls 91 and 92 is adjusted.
  • the stretchable sheet 70 that has been roll-stretched is sent out in the direction of arrow D by the outfeed roll 94.
  • the stretchable sheet 70 is pulled out between the tooth gap extending rolls 91 and 92 in a state where tension is applied by the outfeed roll 94.
  • the stretchable sheet 70 is easily stretched even with a slight tension, the tension applied to the stretchable sheet 70 after stretching by the pair of outfeed rolls 94 is applied to the laminate 70 ′ before stretching by the pair of infeed rolls 93. It is preferable to make it weaker.
  • the laminate 70 ′ not imparted with stretchability is roll-stretched when the teeth 79 and the teeth 80 mesh with each other while being positioned between the tooth gap stretching rolls 91 and 92, and the stretchable portion 70 a and the joint portion 70 b are connected to each other. It is formed. Thereby, stretchability is expressed in the stretchable sheet 70. Adjustment of the degree of extension in the region that becomes the stretchable part 70a is performed by adjusting the rotation speed of the tooth gap extension rolls 91 and 92 and the rotation speed of the pair of infeed rolls 93.
  • the tension applied to the laminated body 70 'when the laminated body 70' is inserted between the tooth groove extending rolls 91 and 92 is adjusted. adjust. For example, when it is desired to relatively increase the height of the convex portion 74 made of a non-woven fabric in the stretchable portion 70a, the tension applied to the laminated body 70 'put into the tooth gap extending rolls 91 and 92 is increased.
  • the meshing amount of the low toothpick portion 77a and the low toothpick portion 78a is configured to be smaller than the meshing amount of the high toothpick portion 77b and the high toothpaste portion 78b. Thereby, the stretch ratio is higher in the region where the high tooth portion 77b and the high tooth portion 78b are engaged than in the region where the low tooth portion 77a and the low tooth portion 78a are engaged.
  • High convex portions 74b and high convex portions 71b are formed in the region processed at a relatively high stretch ratio of the laminate 70 ′.
  • the region passing between the high toothed portion 77b of the tooth 79 of the laminated body 70 'and the high toothed portion 78b of the tooth 80 is a region where the high convex portion 74b and the high convex portion 71b of the stretchable sheet 70 are formed. It becomes the low shrinkage stress region P2.
  • the low convex part 74a and the low convex part 71a are formed in the area
  • the region passing between the low toothed portion 77a of the tooth 79 of the laminate 70 'and the low toothed portion 78a of the tooth 80 is a region where the low convex portion 74a and the low convex portion 71a of the stretchable sheet 70 are formed. It becomes the high shrinkage stress region P1.
  • the laminated body 70 ' is processed so that the stretching ratio is different for each region.
  • a convex portion 74 (71) having a convex portion 74b (71b) and a low convex portion 74a (71a) is formed.
  • the draw ratio can be appropriately set by adjusting the ratio of the rotational speeds of the infeed roll 93 and the tooth gap extending rolls 91 and 92.
  • each tooth of the tooth gap extending rolls 91 and 92 has a high tooth part and a low tooth part, but only the tooth of one tooth groove extending roll has a high tooth part and a low tooth part.
  • the tooth of the other tooth gap extending roll may be the same in the axial direction.
  • FIG.22 and FIG.23 a state in which the laminated body 70 ′ is processed while being sandwiched between a pair of tooth gap extending rolls 91 and 92 of the extending apparatus 90 is shown.
  • the state in which the laminated body 70 ′ is subjected to the roll stretching process is naturally an uneven shape, and the elastic sheet 70 may be entirely wave-shaped, but FIGS. ) Shows, for convenience, a state in which the uneven shape and the wave shape are extended in a planar shape without extending the elastic filament 871.
  • the fibers of the first nonwoven fabric 85 ′ and the second nonwoven fabric 86 ′ before processing are welded to the elastic filament 87a at the interface. ing.
  • the laminated body 70 'at this stage does not have stretchability.
  • the elastic filament 87a extends along the conveyance direction of the stacked body 70 '. The conveyance direction corresponds to the Y-axis direction of the stretchable sheet 70.
  • the laminated body 70 ′ is partially extended by causing the laminated body 70 ′ to bite between the rotated tooth gap extending rolls 91 and 92. Specifically, the region of the laminate 70 ′ that is located between the apex 88 of the adjacent tooth 79 and the apex 89 of the tooth 80 when the tooth 79 and the tooth 80 are engaged with each other is elongated, and the apex 88 of the tooth 79 is expanded. The region that contacts the top 89 of the tooth 80 is hardly elongated.
  • the elastic filament 87 a is stretched, and the fibers constituting the first nonwoven fabric 85 ′ and the second nonwoven fabric 86 ′ before processing are stretched and plastically deformed and stretched. A part of the fiber welded to the elastic filament 87a is peeled off from the elastic filament 87a.
  • the elastic filament 87a is not stretched, and the fibers constituting the first nonwoven fabric 85' and the second nonwoven fabric 86 'before processing are not plastically deformed and are elastic. There is almost no peeling of the fiber from the filament 87a.
  • Such a region where the nonwoven fabric fibers that are not plastically deformed are arranged becomes the joint portion 70 b of the stretchable sheet 70.
  • the regions 70 a of the stacked body 70 ′ that contact the top portions 88 of the teeth 79 and the top portions 89 of the teeth 80 become the connecting portions 70 b.
  • a region located between the apex 88 of the teeth 79 adjacent to the body 70 ′ and the apex 89 of the teeth 80 is an expandable portion 70 a.
  • the stretchable parts 70a and the connecting parts 70b are alternately formed in the Y-axis direction.
  • the lower toothed portion 77a of the tooth gap stretching roll 91 and the lower width of the tooth groove stretching roll 92 are formed in the center portion that is equally divided into three in the X-axis direction orthogonal to the conveyance direction of the laminate 70 ′.
  • the toothpaste portion 78a abuts, and the high toothpaste portion 77b of the tooth gap extending roll 91 and the high tooth portion 78b of the tooth gap extending roll 92 abut on both sides in the X-axis direction.
  • the engagement amount of the low tooth portions 77a and 78a is 2 mm
  • the engagement amount of the high tooth portions 77b and 78b is 3 mm.
  • the stretching ratio of the region in the center in the X-axis direction that has been stretched by meshing the low tooth portions 77a and 78a is equal to both sides in the X-axis direction that has been stretched by meshing the high tooth portions 77b and 78b. It is lower than the area of the part.
  • the stretchable sheet 70 can be manufactured without using an adhesive. For this reason, in the elastic sheet 70, the touch of the 1st nonwoven fabric 85 and the 2nd nonwoven fabric 86 can be kept soft with an adhesive agent. Further, in the stretchable sheet 70, the elastic filaments 87a are encapsulated by the first nonwoven fabric 85 and the second nonwoven fabric 86, and the touch of the first nonwoven fabric 85 and the second nonwoven fabric 86 is not impaired by the elastic filaments 87a. The original soft touch can be obtained as it is.
  • FIG. 25 is a perspective view of a disposable diaper 30 (hereinafter referred to as diaper 30) according to an embodiment of the present invention in which the stretchable sheet 70 having regions having different shrinkage stresses is applied to the exterior body 39.
  • the diaper 30 is a pants-type absorbent article for capturing the excrement of an infant who is a wearer without leaking.
  • the diaper 30 includes an exterior body 39 and an absorber 9.
  • the exterior body 39 constitutes the exterior of the diaper 30.
  • the absorber 9 is held inside the exterior body 39. That is, the exterior body 39 is arranged on the outer surface side of the absorbent body 9 that is directed to the side opposite to the wearer's skin side when worn.
  • the inner side in each configuration indicates a side located on the skin side of the wearer when wearing the diaper, and the outer side indicates a side opposite to the skin side of the wearer.
  • the absorber 9 is configured to capture the excrement and absorb the liquid contained in the excrement.
  • the absorbent body 9 is formed in a band shape, and is disposed in a wide range from the crotch portion 40 in the exterior body 39 to the abdominal side portion 34a and the back side portion 34b of the waist portion 34.
  • the exterior body 39 includes a waist part 34 and a crotch part 40 formed in a series.
  • the waist part 34 forms the waist opening part 7, and is arrange
  • the waist part 34 is comprised with the expansion-contraction member which can be expanded-contracted over a trunk periphery direction so that a wearer's trunk periphery may be fitted.
  • the crotch part 40 is located on the lower side of the waist part 34 in FIG.
  • the waist part 34 has an abdominal side part 34a arranged on the front side when worn and a back side part 34b arranged on the rear side.
  • the abdominal side portion 34a and the back side portion 34b are joined by, for example, heat sealing or ultrasonic sealing at the side seal portions 18 provided at both ends in the width direction orthogonal to the front-rear direction.
  • the waist part 34 becomes a cylinder shape and the waist opening part 7 is formed between the abdominal side part 34a and the back side part 34b.
  • the crotch part 40 is located between the ventral part 34a and the dorsal part 34b.
  • the crotch part 40 connects the abdominal part 34a and the dorsal part 34b so as to form a pair of leg openings 14 through which the wearer's legs are inserted on both sides in the width direction.
  • the leg crotch portion 40 is provided with a leg gather 19 including a rubber thread 19 a disposed along the leg opening 14.
  • FIGS. 26 and 27 are separated from the abdomen side portion 34a and the back side portion 34b by peeling the side seal portion 18 from the state shown in FIG. This is a state in which 9 is extended along the XY plane.
  • FIG. 27 is a plan view showing a developed state of the outer package 39 of the diaper 30 of FIG. 25, and shows the positions of the high shrinkage stress region P1 and the low shrinkage stress region P2.
  • FIG. 27 corresponds to a view of the exterior body 39 seen from the outside, and shows a state in which a first sheet 44 described later is positioned on the near side.
  • the expansion / contraction region of the exterior body 39 is indicated by a dot pattern, and the degree of contraction stress in each region is indicated by the density of the dot pattern.
  • the exterior body 39 has an elastic sheet, and the exterior body 39 of the present embodiment is an elastic member in which the first sheet 44 and the second sheet 12 that is a base sheet are bonded together by the adhesive layer 13.
  • a composite sheet 60 is used.
  • the first sheet 44 is configured using the stretchable sheet 70 having a plurality of regions having different shrinkage stresses.
  • seat 44 can be expanded-contracted in the circumferential direction of a trunk
  • seat 44 is an elastic nonwoven fabric comprised from the nonwoven fabric which includes an elastic resin layer.
  • the second sheet 12 is a non-stretchable sheet made of a non-stretchable non-woven fabric disposed so as to face the first sheet 44.
  • the adhesive layer 13 adheres the first sheet 44 and the second sheet 12.
  • the second sheet 12 is provided facing the inner side of the first sheet 44, and the first sheet 44 is located on the outer surface 39 a side of the exterior body 39.
  • the X-axis direction corresponds to the front-rear direction
  • the Y-axis direction corresponds to the width direction
  • the Z-axis direction corresponds to the thickness direction.
  • the circumferential direction of the trunk in the ventral side 34a and the back side 34b of the waist 34 in FIG. 25 corresponds to the width direction Y in FIGS.
  • the expansion / contraction direction Y of the above-mentioned elastic sheet 70 and the width direction Y in the diaper 30 correspond.
  • the waist portion 34 it may be described as the vertical direction.
  • the up-down direction corresponds to the up-down direction of the diaper 30 when the wearer wears the diaper 30 in a standing state.
  • the front-rear direction and the vertical direction coincide with each other.
  • the waist part 34 of the exterior body 39 has elasticity in the circumferential direction of the trunk.
  • the abdominal side portion 34a (the back side portion 34b) of the waist portion 34 of the first sheet 44 constituting the exterior body 39 that is required to be stretchable in the waist circumference direction has different contraction stresses. It has a first region 31a (first region 31b) and two second regions 32a (second regions 32b).
  • the ventral portion 34a (the dorsal side portion 34b) has a first region 31a (first region 31b) in a central region located in the center among the regions divided into three equal parts in the vertical direction orthogonal to the circumferential direction of the trunk.
  • the second region 32a (second region 32b) is located in both of the pair of end regions located opposite to each other in the vertical direction via the central region.
  • high convex portions are arranged on both of the pair of end regions to form the second region.
  • a high convex portion may be arranged on at least one of the two regions.
  • the first region 31 (second region 32) includes a first region 31a on the ventral side (second region 32a on the ventral side) and a first region 31b on the back side (on the back side).
  • the second region 32b) is referred to as the first region 31 (second region 32) when it is not necessary to distinguish between them.
  • the first region 31 and the second region 32 have different contraction stresses.
  • the first region 31 is a high shrinkage stress region P1
  • the second region 32 is a low shrinkage stress region P2.
  • Low convex portions 71 a and 74 a are disposed in the first region 31, and high convex portions 71 b and 74 b are disposed in the second region 32.
  • the contraction stress is relatively high in the first region 31 and low in the second region 32.
  • the width dimension (length in the Y-axis direction) of the low shrinkage stress region P2 and the width dimension of the high shrinkage stress region P1 are substantially equal.
  • the waist portion 34 is configured such that when the first region 31 and the second region 32 are stretched at the same stretch rate, the force (shrinkage stress) for contracting and returning to each region is different. Is done. Thereby, when the waist part 34 is extended
  • the upper side (near the waist opening 7) and the lower side (region close to the crotch part 40 of the waist part 34) of the waist part 34 have a lower contraction stress than the center part in the vertical direction of the waist part 34. That is, the tightening pressure is reduced.
  • the first sheet 44 is a seamless stretchable sheet formed continuously from the ventral side portion 34a through the crotch 40 to the back side portion 34b.
  • the first sheet 44 itself can be expanded and contracted by the elastic force of the elastic filament 87a, and the composite sheet 60 functions as an expandable sheet.
  • the waist part 34 of the exterior body 39 can be expanded-contracted in the trunk
  • FIG. Therefore, the composite sheet 60 can be configured such that an elastic body such as rubber thread is not provided between the first sheet 44 and the second sheet 12.
  • the adhesive layer 13 includes a plurality of adhesive portions 21 disposed between the first sheet 44 and the second sheet 12.
  • the adhesive layer 13 is disposed across the first region 31a (first region 31b) and the two second regions 32a (second region 32b) of the ventral side portion 34a (back side portion 34b).
  • the plurality of bonding portions 21 extend continuously in the vertical direction and are intermittently arranged in the circumferential direction of the trunk.
  • the adhesive layer 13 is typically formed of an adhesive.
  • a hot melt adhesive is used as the adhesive forming the adhesive layer 13.
  • the adhesive layer 13 can be formed of various adhesives such as a thermoplastic adhesive and a reactive adhesive.
  • the second sheet 12 made of a non-stretchable nonwoven fabric constituting a part of the composite sheet 60 can be composed of any non-stretchable sheet that does not easily stretch in the Y-axis direction.
  • the non-stretchable sheet constituting the second sheet 12 for example, a non-woven fabric, a woven fabric, paper, or the like can be used.
  • the second sheet 12 is a non-woven fabric using fibers similar to the first non-woven fabric 85 and the second non-woven fabric 86 of the first sheet 44 in order to obtain the same feel as the first sheet 44. Can be configured.
  • the diaper 30 is manufactured as follows.
  • the exterior body 39 is formed by disposing the adhesive layer 13 on the first sheet 44 stretched at a constant stretch rate and bonding the adhesive layer 13 to the second sheet 12.
  • bonding at a constant elongation rate means bonding the second sheet 12 in a state where the high shrinkage stress region P1 and the low shrinkage stress region P2 of the first sheet 44 are stretched at the same elongation rate.
  • the absorbent body 9 is overlapped on the inside of the extended exterior body 39, and both are bonded and fixed, and then the abdominal side portion 34a and the back side portion 34b are overlapped in a state in which the extended state is maintained.
  • the side edge portions are joined to form the side seal portion 18.
  • the underpants type diaper 30 is manufactured.
  • the stretchable sheet 70 is applied as the first sheet 44 for imparting stretchability to the composite sheet 60 constituting the abdominal side portion 34a and the back side portion 34b.
  • the body followability is high, and the disposable diaper 30 with good fit around the waist can be obtained.
  • the stretchable sheet 70 in which different regions of contraction stress exist in the X-axis direction with a single member seamlessly is used as the first sheet 44. .
  • a diaper 30 having an appearance and a tactile sensation of underwear with uniform texture such as a fabric without a seam in the sheet can be obtained in the entire region of the abdominal side portion 34a and the entire back side portion 34b.
  • the diaper 30 of this embodiment since the center part of the up-down direction rather than the upper side and lower side of the waist part 34 is comprised so that a contraction stress may become high and a clamping pressure may become high at the time of wear, the diaper 30 It is possible to effectively prevent slippage during wearing. Wearers, especially infants, have a waist that stretches out as a physical feature of the wearer. The waist part of the diaper is gradually narrowed down, and the waist part tends to be shifted to a site where the abdomen becomes thinner.
  • shrinkage stress value (Shrinkage stress value in stretchable sheet) Assuming that the stretchable sheet of the present invention is used for an exterior body such as an absorbent article, the shrinkage stress at an elongation of 50% in the low-shrinkage stress region P2 and the high-shrinkage stress region P1 of the stretchable sheet is less than the upper limit value described below.
  • the exterior body is constituted by a stretchable sheet alone and a composite sheet formed by laminating a stretchable sheet and a non-stretchable sheet like the diaper 30 described above.
  • the shrinkage stress distribution suitable for the exterior body can be obtained by setting the shrinkage stress value of the stretchable sheet alone within the range described later.
  • the shrinkage stress at an elongation of 50% of the low shrinkage stress region P2 where the high convex portion 74b (71b) is disposed is preferably 1 cN / mm or more, more preferably 1.5 cN / mm or more. It is preferably 3 cN / mm or less, more preferably 2.5 cN / mm or less, and preferably 1 cN / mm or more and 3 cN / mm or less, more preferably 1.5 cN / m or more and 2.5 cN / mm or less. In this embodiment, it is 2 cN / mm.
  • the shrinkage stress at 100% elongation of the low shrinkage stress region P2 where the high convex portion 74b (71b) is disposed is preferably 2 cN / mm or more, more preferably 2.5 cN / mm or more, and preferably 4 cN / mm.
  • it is more preferably 3.5 cN / mm or less, and preferably 2 cN / mm or more and 4 cN / mm or less, more preferably 2.5 cN / mm or more and 3.5 cN / mm or less.
  • it is 3 cN / mm.
  • the shrinkage stress at an elongation of 50% of the high shrinkage stress region P1 where the low convex portion 74a (71a) is disposed is preferably 2 cN / mm or more, more preferably 2.5 cN / mm or more, and preferably 4 cN / mm.
  • it is more preferably 3.5 cN / mm or less, and preferably 2 cN / mm or more and 4 cN / mm or less, more preferably 2.5 cN / mm or more and 3.5 cN / mm or less.
  • it is 4 cN / mm.
  • the shrinkage stress at 100% elongation of the high shrinkage stress region P1 in which the low convex portion 74a (71a) is disposed is preferably 40 cN / mm or more, more preferably 50 cN / mm or more, and preferably 90 cN / mm.
  • it is more preferably 80 cN / mm or less, and preferably 40 cN / mm or more and 90 cN / mm or less, more preferably 50 cN / mm or more and 80 cN / mm or less.
  • it is 67 cN / mm.
  • the shrinkage stress per unit length in the Y-axis direction of the low shrinkage stress region P2 is lower than that of the high shrinkage stress region P1.
  • a plurality of elastic filaments 87a are arranged at equal intervals in the X-axis direction in both the high shrinkage stress region P1 and the low shrinkage stress region P2, and the thickness of each elastic filament 87a, The density is also the same.
  • the difference of the contraction stress by the difference in the height of the high convex part 74b (71b) and the low convex part 74a (71a) is expressed effectively.
  • the stretchable sheet 70 is configured to have a convex portion having a high convex portion and a low convex portion. It is preferable to configure the numerical value range.
  • the preparation method and measurement method of the sample used for the contraction stress measurement of an elastic sheet are demonstrated.
  • the absorbent article including the stretchable sheet as a part of the structure when only the elastic filament and the portion composed only of the nonwoven fabric that is directly bonded to the stretchable sheet are exposed, only the exposed portion is scissors or Obtained by cutting with a cutter.
  • the absorbent article When there is no exposed portion and the stretchable sheet is bonded to another component by an adhesive, the absorbent article is immersed in acetone, toluene, or butyl acetate for 24 hours, and the minimum structural unit is placed on a metal bat. And air-dried for 96 hours in a fume hood.
  • the stretch sheet obtained by the above method is cut from each of the high shrinkage stress region P1 and the low shrinkage stress region P2 along a straight line parallel to the stretch direction (corresponding to the Y-axis direction) and further orthogonal to the stretch direction. Cut along a straight line parallel to the direction (corresponding to the X-axis direction) to cut out a rectangular sample. After cutting, the sample in the natural state is cut out so as to have a strip shape of 70 mm along the Y-axis direction and 50 mm along the X-axis direction.
  • Both sides of the cut out region of the sample in the length direction are fixed between a pair of chucks of a Tensilon tensile tester (“Autograph AG-X” manufactured by Shimadzu Corporation).
  • the chuck portion has a length in the tensile direction of 20 mm and a length in the direction orthogonal to the tensile direction of 60 mm.
  • the sample is fixed by being sandwiched by the chuck with air pressure of at least 1 MPa so that the chuck part includes a portion having a width of 10 mm from the edge at each of both ends in the length direction of the sample.
  • the chuck interval is 50 mm, and the sample is fixed in a natural state.
  • the chuck interval is appropriately adjusted according to the length of the sample piece.
  • the sample was stretched at 300 mm / min, and the unit length (1 mm) when the sample length (distance between chucks) reached 150% and 200% of the length in the natural state.
  • the per tensile load (cN) is the shrinkage stress at an elongation of 50% and the contraction stress at an elongation of 100%.
  • the shrinkage stress of the high shrinkage stress region P1 is preferably 1.4 cN / mm or more, more preferably 2 cN / mm or more, preferably 5 cN / mm or less, and preferably 1 4 cN / mm or more and 5 cN / mm or less, more preferably 2 cN / mm or more and 5 cN / mm or less.
  • the shrinkage stress of the second region 32 is preferably 0.1 cN / mm or more, more preferably 0.5 cN / mm or more, preferably 3 cN / mm or less, more preferably 2.5 cN / mm or less, And it is preferably 0.1 cN / mm or more and 3 cN / mm or less, more preferably 0.5 cN / mm or more and 2.5 cN / mm or less.
  • the shrinkage stress of the first region 31 is preferably 1.2 times or more, more preferably 1.4 times or more, and preferably 3 times or less, more preferably 2.5 times that of the second region 32. It is preferably 2 times or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.4 times or more and 2.5 times or less.
  • the side seal portion 18 of the disposable diaper 30 is peeled off, and the exterior body 39 is extended at the same ratio in both the first region 31 and the second region 32 of the exterior body 39, and is unfolded and spread on a plane.
  • the first region 31 and the second region 32 are cut from each region along a straight line parallel to the width direction, and further along a straight line parallel to the front-rear direction. And cut a rectangular sample.
  • the sample is a region other than the region facing the absorber 9 of the exterior body 39 when viewed in plan, and on the extension line of a pair of side edges of the absorber 9 that defines the width direction of the absorber 9 Cut out from the area outside the sandwiched area.
  • the sample size in the natural state is cut out so as to be 70 mm along the Y-axis direction and 50 mm along the X-axis direction in the same manner as the sample creation of the stretchable sheet. (Measuring method)
  • the sample of each cut out region is fixed to the Tensilon tensile tester.
  • the sample was stretched at 300 mm / min, stretched until the sample length (distance between chucks) reached 185% of the length in the natural state, and then shrunk to a length of 140%.
  • the tensile load (cN) per unit length (1 mm) in the width direction is taken as the contraction stress.
  • 140% is used as an index is to reproduce the stretched state of the sample when the pants-type disposable diaper 30 is worn.
  • the distance c between the convex portions 74 (71) indicates the distance between the top portions of the adjacent convex portions 74 (71) located on the same surface side of the stretchable sheet 70.
  • the width d of the flat part 75 (72), that is, the length in the Y-axis direction, indicates the distance between the boundaries with the respective convex parts 74 (71) located on both sides when viewed from the flat part 75 (72).
  • the wave width e indicates the distance between the top portion 81 and the trough portion 82 of the corrugated stretchable sheet 70, and corresponds to the thickness of the corrugated stretchable sheet 70.
  • the arrangement interval f of the elastic filaments 87a indicates the distance between the centers of the adjacent elastic filaments 87a.
  • the height h, width w, distance c, width d, The wave width e and the interval f are preferably 2 mm or less. More specifically, the height h of the high convex portion 74b (71b) located in the low shrinkage stress region P2 is preferably 750 ⁇ m or more and 950 ⁇ m or less. In the present embodiment, the height h of the high convex portion 74b (71b) is 841 ⁇ m.
  • the width w of the high convex portion 74b (71b) is preferably 900 ⁇ m or more and 1100 ⁇ m or less. In the present embodiment, the width w of the high convex portion 74b (71b) is 998 ⁇ m.
  • the distance c between the high protrusions 74b (71b), that is, the arrangement interval of the protrusions 74 (71) in the low shrinkage stress region P2 is preferably 1400 ⁇ m or more and 1600 ⁇ m or less. In the present embodiment, the distance c between the high convex portions 74b (71b) is 1526 ⁇ m.
  • the width d of the flat portion 75 (72) in the low shrinkage stress region P2 is preferably 500 ⁇ m or more and 750 ⁇ m or less.
  • the flat portion 75 (72) width d in the low shrinkage stress region P2 is 620 ⁇ m.
  • the wave width e in the low shrinkage stress region P2 is preferably 350 ⁇ m or more and 600 ⁇ m or less. In the present embodiment, the wave width e in the low shrinkage stress region P2 is 481 ⁇ m.
  • the height h of the low protrusion 74a (71a) located in the high shrinkage stress region P1 is preferably 450 ⁇ m or more and 650 ⁇ m or less. In the present embodiment, the height h of the low convex portion 74a (71a) is 544 ⁇ m.
  • the width w of the low protrusion 74a (71a) is preferably 850 ⁇ m or more and 1050 ⁇ m or less. In the present embodiment, the width w of the low convex portion 74a (71a) is 957 ⁇ m.
  • the distance c between the low protrusions 74a (71a), that is, the arrangement interval of the protrusions 74 (71) in the high shrinkage stress region P1 is preferably 1500 ⁇ m or more and 1700 ⁇ m or less. In the present embodiment, the distance c between the low convex portions 74a (71a) is 1602 ⁇ m.
  • the width d of the flat portion 75 (72) in the high shrinkage stress region P1 is preferably 500 ⁇ m or more and 750 ⁇ m or less. In the present embodiment, the flat portion 75 (72) width d is 636 ⁇ m.
  • the wave width e in the high shrinkage stress region P1 is preferably 350 ⁇ m or more and 600 ⁇ m or less.
  • the wave width e in the high contraction stress region P1 is 491 ⁇ m.
  • the arrangement interval f of the elastic filaments 87a is preferably 0.5 mm or more and 2 mm or less. In the present embodiment, the arrangement interval f of the elastic filaments 87a is 1 mm.
  • the low convex portion 74a (71a) and the high convex portion 74b (71b) respectively disposed on the same surface side of the stretchable sheet 70 are the height of the low convex portion 74a (71a) of the high convex portion 74b (71b).
  • the height is preferably 0.5 times or more, more preferably 0.6 times or more, preferably 0.8 times or less, more preferably 0.7 times or less, and preferably 0.5 times
  • the ratio is 0.8 times or less, and more preferably 0.6 times or more and 0.7 times or less.
  • the height of the low convex portion 74a (71a) is about 0.65 times the height of the high convex portion 74b (71b).
  • the distance c between the high convex portions 74b (71b) in the low shrinkage stress region P2 and the distance c between the low convex portions 74a (71a) in the high shrinkage stress region P1 are substantially the same. Further, since the width w of the high convex portion 74b (71b) and the width w of the low convex portion 74a (71a) are substantially the same, the high contraction stress region P1 and the low contraction stress region of the stretchable sheet 70 in the natural state. The width in the expansion / contraction direction at P2 is substantially the same.
  • Such a stretchable sheet 70 is difficult to visually recognize the boundary between the high shrinkage stress region P1 and the low shrinkage stress region P2, and has an appearance with a sense of unity. And although it is the external appearance with such a unity feeling, at the time of expansion
  • substantially the same means that one value is in the range of 90% to 110% of the other value.
  • the stretchable sheet 70 can have an external appearance with a sense of unity within the nonwoven fabric surface, and the entire surface of the sheet becomes smooth, and the material is not easily destroyed due to catching. Can do.
  • the length in the Y-axis direction of the heat-sealed portion non-existing region 65 of the stretchable sheet 70 is preferably 0.2 mm or more, more preferably 0.4 mm or more, and preferably 1.4 mm or less, more preferably 1 .2 mm or less, and preferably 0.2 mm or more and 1.4 mm or less, more preferably 0.4 mm or more and 1.2 mm or less. In this embodiment, it is 0.79 mm.
  • the length in the X-axis direction of the heat-sealed part non-existing region 65 is preferably 1.2 mm or more, more preferably 1.4 mm or more, and preferably 2.4 mm or less, more preferably 2.2 mm or less. And, Preferably they are 1.2 mm or more and 2.4 mm or less, More preferably, they are 1.4 mm or more and 2.2 mm or less. In this embodiment, it is 1.84 mm.
  • the length in the X-axis direction of the heat fusion part non-existing region 65 is preferably 1.5 times or more, more preferably 1.8 times or more, and preferably 3 times or less the length in the stretching direction Y. More preferably, it is 2.8 times or less, and preferably 1.5 times or more and 3 times or less, more preferably 1.8 times or more and 2.8 times or less. In this embodiment, it is about 2.3 times.
  • At least one layer of the nonwoven fabrics 85 and 86 constituting the stretchable sheet 70 has a residual strain of preferably 70% or less, more preferably 65% or less after the fibers constituting the nonwoven fabric give 100% elongation. Preferably it is 50% or more, more preferably 55% or more, and preferably 50% or more and 70% or less, more preferably 55% or more, and preferably 50% or more and 70% or less, more preferably 55%. % Or more and 65% or less is desirable.
  • an oblique shear stress acts on the boundary 69 at the boundary 69.
  • the first nonwoven fabric 85 or the second nonwoven fabric 86 is desirably an elastic sheet that can tolerate this shear stress.
  • the first nonwoven fabric 85 and the second nonwoven fabric 86 are formed using fibers having a large amount of elastic behavior whose residual strain is equal to or less than the upper limit, the high shrinkage stress region P1 and the low shrinkage stress region P2 In the vicinity of the boundary 69, a shear stress can be allowed, and it is possible to make it difficult for material damage to occur during elongation. For this reason, the residual strain after the fibers constituting at least one layer of the first nonwoven fabric 85 and the second nonwoven fabric 86 serving as the base material are given 100% elongation is more than the above upper limit value.
  • Such a nonwoven fabric having a small residual strain can be obtained by, for example, a spunbond method using a resin in which a propylene / ethylene / ⁇ -olefin copolymer is mixed with isotactic polypropylene.
  • At least one layer of the first nonwoven fabric 85 and the second nonwoven fabric 86 has a residual strain of 70% or less after the fibers constituting the nonwoven fabric are given 100% elongation, which causes material damage. Is less likely to occur.
  • the measurement of the residual strain of the fibers constituting the nonwoven fabrics 85 and 86 of the stretchable sheet 70 is performed as follows.
  • the razor is pressed against the stretchable sheet in the same manner as the measurement method for the dimensions of each of the above components, and the largest rectangle in the range not including the heat fusion part, Two of the four sides are cut out so that they are parallel to the X-axis and Y-axis directions.
  • the first nonwoven fabric 85 and the second nonwoven fabric 86 are peeled off from the elastic filament 87a by being pulled with tweezers, and these are separated.
  • the first nonwoven fabric 85, the second nonwoven fabric 86, and the elastic filament 87a are welded at the interface, and thus can be separated in this way.
  • all the fibers are drawn out with a tweezers from a cross section along the X-axis direction of the stretchable sheet to obtain a fiber group.
  • One fiber is taken out from the fiber group, and both sides of the fiber are fixed between the pair of chucks of the Tensilon tensile tester.
  • the sample is fixed by holding 20% of the fiber length from the end edge of each end of the sample in the longitudinal direction with a chuck.
  • the chuck interval is 60% of the fiber length.
  • the chuck interval is appropriately adjusted according to the length of the sample piece. And when the sample was stretched at a rate of 100% in the length direction of the sample at 50 mm / min, the stretched state was gradually released and contracted, and the tensile stress was 0.1 cN / mm Obtain distortion (%). Further, the sample is stretched at a speed of 50 mm / min, and the elongation at the time when the sample stops stretching is obtained as the maximum point elongation (%). The residual strain (%) is obtained by multiplying the value obtained by dividing the strain when the tensile stress becomes 0.1 cN / mm by the maximum point elongation by 100. This measurement is carried out for all the fiber groups to determine the residual strain, and the average value is taken as the residual strain of the fibers constituting the nonwoven fabric.
  • the elastic filament 87a has a residual strain of 60% or less after being given 100% elongation under a temperature condition of 40 ° C. for 6 hours. Is desirable. Further, it is preferably 50% or more.
  • 40 ° C. is for setting the temperature close to the temperature of the wearer of the disposable diaper when the stretchable sheet 70 is applied to the exterior body of the disposable diaper, and is a temperature setting close to the environment used for the implementation. .
  • the elasticity of the elastic sheet 70 is maintained by using the elastic filament 87a having a low stress relaxation of a residual strain of 60% or less after being given 100% elongation for 6 hours under a temperature condition of 40 ° C. be able to. Thereby, a comfortable wearing feeling can be given to the wearer.
  • the lower limit value of the residual strain is not limited.
  • the measurement of the residual strain of the elastic filament is performed as follows.
  • the stretchable sheet piece is cut out from the stretchable sheet 70 in the same manner as the method for measuring the residual strain of the nonwoven fabric fibers, and the nonwoven fabrics 85 and 86 and the elastic filament 87a are separated.
  • the separated elastic filaments 87a are cut out to a length of 10 mm to produce five samples. Both sides in the length direction of the cut sample are fixed between a pair of chucks of the Tensilon tensile tester.
  • the sample is fixed by sandwiching, at a pressure of at least 1 MPa, a portion having a width of 2.5 mm from the edge at each of both ends in the length direction of the sample.
  • the chuck interval is 5 mm, and the sample is fixed in a natural state.
  • the chuck interval is appropriately adjusted according to the length of the sample piece. Then, the state in which the sample is stretched up to 100% in the length direction of the sample at 50 mm / min is maintained under a temperature condition of 40 ° C. for 6 hours. Thereafter, the stretched state is released and contracted, and the elongation of the sample when the tensile stress becomes 0 is measured to determine the residual strain.
  • the exterior body 39 of the disposable diaper 30 includes a first sheet 44 that is a stretchable sheet and a second sheet 12 that is a non-stretchable sheet.
  • the stretchable nonwoven fabric means one having a recovery rate (elongation recovery rate) of 70% or more when stretched at least 100% in the same direction as the shrinkage direction. Further, the elongation of the stretchable nonwoven fabric used in this embodiment is preferably 100% or more, and more preferably 150% or more.
  • the elongation recovery rate and elongation can be measured as follows.
  • the elongation recovery rate at 100% elongation is calculated from the following formula.
  • Elongation recovery rate at 100% elongation (%) ⁇ (L2-L1) / (L2-L0) ⁇ ⁇ 100 (Measurement method of elongation)
  • a sample piece having the same size as that of the sample piece used in the method for measuring the elongation recovery rate is stretched under the same conditions as the measurement of the elongation recovery rate, and the elongation at the time of breaking is defined as the elongation.
  • FIG. 28 is a schematic cross-sectional view of the stretchable sheet 99.
  • FIG. 28 shows a state in which the boundary surface between the first nonwoven fabric 85 and the second nonwoven fabric 86 is flattened so as to straighten the wave-like undulation of the elastic filament 87a in a non-elongated state.
  • FIG. 28 shows a state in which the boundary surface between the first nonwoven fabric 85 and the second nonwoven fabric 86 is flattened so as to straighten the wave-like undulation of the elastic filament 87a in a non-elongated state.
  • the convex part 71 in the other surface may be located facing the position of the convex part 74 in one surface in the thickness direction.
  • the convex portion 71 on the other surface is located at a position between the adjacent convex portion 74 and the convex portion 74 on one surface. It is comprised so that it may be located facing the thickness direction.
  • the convex portion 74 of the first nonwoven fabric 85 is located at the stretchable portion 95 of the first nonwoven fabric 85, and the flat portion 75 is located at the joint portion 96.
  • a convex portion 71 of the second nonwoven fabric is located at the stretchable portion 97 of the second nonwoven fabric 86, and a flat portion 72 is located at the joint portion 98.
  • the length of the convex portion 74 (convex portion 71) in the Y-axis direction is longer than the flat portion 75 (flat portion 72).
  • the stretchable part 95 in the first nonwoven fabric 85 and the stretchable part 97 in the second nonwoven fabric 86 are located partially facing each other in the thickness direction.
  • the stretchable portion 95 of the first nonwoven fabric 85 opposes the joining portion 98 in the second nonwoven fabric 86 and a portion of each of the stretchable portions 97 and 97 located on both sides adjacent to the joining portion 98 in the thickness direction. . That is, in the stretchable sheet 99, there is no region where the region where the connecting portion 96 of the first nonwoven fabric 85 is disposed and the region where the connecting portion 98 of the second nonwoven fabric 86 is disposed are opposed in the thickness direction. In other words, the stretchable sheet 99 is configured such that there is no region of only the connecting portion on the XY plane.
  • the joint portion 96 (98) is essential for fixing between the first nonwoven fabric 85 (second nonwoven fabric 86) and the elastic filament 87a, but the joint portion 96 (98) exhibits stretchability. I can't.
  • the flat portion (joint portion) of the other surface is provided so as to face the convex portion (stretchable portion) of one surface in the thickness direction. ) In the region where the convex portion (stretchable portion) cancels out, and the convex portion on one surface and the flat portion on the other surface face each other. Thereby, expansion
  • extension can be expressed in the Y-axis direction in the whole XY plane.
  • the convex portion 74 and the convex portion 71 have a high convex portion and a low convex portion, respectively, and have the same dimensions as in the first embodiment.
  • the region where the high convex portion is disposed is the low contraction stress region P2
  • the region where the low convex portion is disposed is the high contraction stress region. P1.
  • Such a stretchable sheet 99 having different shrinkage stresses can be applied to an exterior body or the like of a disposable diaper, like the stretchable sheet 70 of the first embodiment.
  • the flat part arrange
  • the centers of 72 in the Y-axis direction almost coincided.
  • the arrangement position of the convex part 74 and the convex part 71 is not limited to these.
  • a convex portion 71 on the other surface and a flat portion 72 adjacent to one side of the convex portion 74 on the other surface in the thickness direction may be opposed to each other.
  • the center in the Y-axis direction of the convex part 74 arranged on one surface is the center in the Y-axis direction of the flat part 72 arranged opposite to the convex part 74 and the center in the Y-axis direction of the convex part 71.
  • an elastic sheet having a high shrinkage stress and a low shrinkage stress can be obtained by forming the convex portion from a high convex portion and a low convex portion.
  • the positional relationship between the convex portions on one surface and the convex portions on the other surface can be adjusted by changing the positions of the meshing teeth of the tooth gap extending rolls 91 and 92.
  • the exterior body was comprised using the 1st sheet
  • the stretchable sheet 70 or the stretchable sheet 99 described above can be used.
  • both the abdominal side and the back side of the waist portion have the stretchable region. Good.
  • stacked is used for the waist part of the exterior body of the disposable diaper of 1st Embodiment, and it is a disposable diaper.
  • the first sheet which is a stretchable sheet, was disposed on the outer surface side, and the second sheet was disposed on the inner surface side, but the first sheet was disposed on the inner surface side, and the second sheet was It may be arranged on the outer surface side.
  • region by cutting or removing a part of elastic element of the elastic sheet of the area
  • the exterior body of the disposable diaper of 1st Embodiment was comprised from the seamless sheet
  • the stretchable sheet according to the present invention can also be used for the exterior body 59 in which the abdomen and the back are separated like a disposable diaper 45 shown in FIG.
  • the exterior body 59 includes a composite sheet 49 including an abdominal side portion 53a, a back side portion 53b, an adhesive layer 13, and second sheets 12a and 12b.
  • the stretchable sheets 70 and 99 according to the present invention can be applied to the ventral side 53a and the backside 53b, and the diaper 45 having stretchability around the waist can be obtained.
  • the absorbent article according to the present invention may not be a pants-type disposable diaper formed in a pants shape in advance by being joined at the side seal portion as in the above embodiment. That is, the pants-type absorbent article according to the present invention may be a tape-type disposable diaper in which a tape such as a hook-and-loop fastener is provided instead of the side seal portion.
  • the absorbent article according to the present invention may not be a disposable diaper for infants, for example, a disposable diaper for adults or children. Furthermore, the absorbent article according to the present invention may not be a disposable diaper as long as it is an absorbent article of the type worn on the lower body. Examples of such absorbent articles include pants-type sanitary napkins and pants-type urine leak pads.
  • This invention discloses the following absorbent articles further regarding embodiment mentioned above.
  • An absorptive body located in the crotch, a waist part having an abdominal part and a dorsal part located around the waist, and located between the abdominal part and the dorsal part, the abdominal part and the dorsal part
  • a pants-type absorbent article having a crotch portion for holding the absorbent body, Expansion and contraction in which at least one of the ventral side portion and the dorsal side portion includes a first region and a second region located above the first region in the vertical direction perpendicular to the circumferential direction of the trunk.
  • the elastic sheet is configured to include an elastic resin and a non-woven fabric layer containing the elastic resin, and the first region and the second region have mutually different circumferential contraction stresses.
  • a pants-type absorbent article in which the dimension in the circumferential direction in the natural state is the same in the region of the second region and the second region.
  • the elastic sheet is A first sheet composed of the nonwoven fabric layer containing the elastic resin; A second sheet comprising a non-stretchable nonwoven fabric facing the first sheet;
  • the second sheet has a plurality of ridges protruding on the opposite side of the first sheet, and the ridges form a series of patterns;
  • the adhesive layer includes a plurality of adhesive portions that are arranged at intervals in the circumferential direction and are arranged continuously or discontinuously along one direction across the first region and the second region.
  • ⁇ 5> The plurality of adhesive portions are arranged continuously or discontinuously along the up-down direction.
  • the plurality of adhesive portions are arranged in a staggered pattern.
  • ⁇ 7> The pants-type absorbent article according to ⁇ 1>, wherein the stretchable sheet is composed of one first sheet composed of the nonwoven fabric layer containing the elastic resin.
  • ⁇ 8> The pants-type absorbent article according to any one of ⁇ 1> to ⁇ 7>, wherein the contraction stress in the first region is higher than that in the second region.
  • the weight of the elastic resin per unit area of the first region is heavier than that of the second region.
  • the elastic resin is composed of a plurality of elastic fibers, The pants-type absorbent article according to any one of ⁇ 1> to ⁇ 8>, wherein the density of the plurality of elastic fibers in the first region is higher than that of the second region.
  • the elastic resin is composed of a plurality of elastic fibers, The pants-type absorbent article according to any one of ⁇ 1> to ⁇ 8>, wherein the plurality of elastic fibers in the first region are thicker than the second region.
  • the elastic resin is composed of elastic filaments that are continuous in a plurality of stretch directions, The plurality of elastic filaments are arranged at intervals in the vertical direction along the circumferential direction,
  • the thickness of the plurality of elastic filaments is the same in the first region and the second region.
  • the elastic sheet further includes a third region located at the upper edge in the vertical direction, and the elastic sheet folded back toward the lower side in the vertical direction,
  • the shrinkage stress in the circumferential direction of the third region is the same as or lower than that of the first region and higher than that of the second region.
  • the pant-type absorbent article is The pants-type absorbent article according to ⁇ 14> or ⁇ 15>, further including an elastic body arranged along the circumferential direction in the folded elastic sheet in the third region.
  • the shrinkage stress in the first region is preferably 1.4 cN / mm or more, more preferably 2 cN / mm or more, and preferably 5 cN / mm or less, and preferably 1.4 cN / mm or more and 5 cN / mm.
  • the shrinkage stress of the second region is preferably 0.1 cN / mm or more, more preferably 0.5 cN / mm or more, preferably 3 cN / mm or less, more preferably 2.5 cN / mm or less, And it is preferably 0.1 cN / mm or more and 3 cN / mm or less, more preferably 0.5 cN / mm or more and 2.5 cN / mm or less. Any one of ⁇ 1> to ⁇ 17> Pants-type absorbent article.
  • the shrinkage stress in the third region is preferably 1.4 cN / mm or more, more preferably 1.5 cN / mm or more, preferably 4 cN / mm or less, more preferably 3.5 cN / mm or less, and Preferably, it is 1.4 cN / mm or more and 4 cN / mm or less, More preferably, it is 1.5 cN / mm or more and 3.5 cN / mm or less,
  • the shrinkage stress of the first region is preferably 1.2 times or more, more preferably 1.4 times or more, preferably 3 times or less, more preferably 2.5 times the shrinkage stress of the second region. Or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.4 times or more and 2.5 times or less, according to any one of the above items ⁇ 1> to ⁇ 19> Pants-type absorbent article.
  • the shrinkage stress in the first region is preferably 1.1 times or more, more preferably 1.5 times or more, and preferably 2.5 times or less, more preferably 2 times that of the third region.
  • the length of the first region in the vertical direction is preferably 1.0 times or more, more preferably 1.2 times or more, and preferably 2 times or less, more preferably the length of the second region.
  • 1.8 times or less and preferably 1.0 times or more and 2 times or less, more preferably 1.2 times or more and 1.8 times or less, and any one of ⁇ 1> to ⁇ 21>
  • the length of the third region in the vertical direction is preferably 0.5 cm or more, 5 cm or less, more preferably 3 cm or less, still more preferably 1.5 cm or less, and preferably 0.5 cm or more and 5 cm. Or less, more preferably 0.5 cm to 3 cm, and still more preferably 0.5 to 1.5 cm or less according to any one of the above ⁇ 14> to ⁇ 16>, ⁇ 19>, ⁇ 21> Pants-type absorbent article.
  • the elastic body is in a natural state where no tension is applied, and has a length equal to or greater than the width along the circumferential direction of each of the abdomen and the dorsal side in the natural state, and the abdomen and the dorsal side.
  • the nonwoven fabric is intermittently disposed along the first direction and is adjacent to the plurality of convex portions extending along a second direction orthogonal to the first direction.
  • a flat portion extending along the second direction arranged between the convex portions that fit,
  • the convex portion has a first convex portion and a second convex portion having different heights along the second direction, and the second convex portion is higher than the first convex portion.
  • At least one of the two layers of the nonwoven fabric includes fibers having a residual strain of 70% or less after giving 100% elongation.
  • At least one of the two layers of the nonwoven fabric is a fiber having a residual strain of 50% or more and 70% or less after the fibers constituting the nonwoven fabric are given 100% elongation.
  • ⁇ 28> The fiber has a residual strain of 55% or more and 65% or less after giving 100% elongation.
  • the elastic filament has a residual strain of 60% or less after giving 100% elongation for 6 hours under a temperature condition of 40 ° C., The elastic sheet according to any one of ⁇ 25> to ⁇ 28>.
  • the elastic filament has a residual strain of 50% or more and 60% or less after giving 100% elongation for 6 hours under a temperature condition of 40 ° C., The elastic sheet according to any one of ⁇ 25> to ⁇ 29>.
  • the elastic sheet has a low shrinkage stress region in which the second convex portion is disposed and a high shrinkage stress region in which the first convex portion is disposed
  • the non-woven fabric has a plurality of heat fusion portions to which a plurality of fibers constituting the non-woven fabric are heat-sealed, The heat fusion part disposed adjacent to the boundary between the high shrinkage stress region and the low shrinkage stress region and the heat fusion disposed adjacent to each other along the second direction via the boundary.
  • the rectangular heat-sealed portion non-existing region surrounded by the bonding portion and in which each side in contact with the heat-fused portion is parallel to the boundary or a virtual line orthogonal to the boundary has a length in the second direction.
  • the length in the second direction of the heat-fused portion non-existing region is 1.5 to 3 times the length in the first direction,
  • the length in the second direction of the heat-fused portion non-existing region is not less than 1.8 times and not more than 2.8 times the length in the first direction.
  • the elastic sheet has a low shrinkage stress region in which the second convex portion is disposed and a high shrinkage stress region in which the first convex portion is disposed,
  • the shrinkage stress per unit length in the first direction of the low shrinkage stress region is lower than the high shrinkage stress region,
  • the elastic sheet according to any one of ⁇ 25> to ⁇ 33>.
  • the stretchable sheet is a continuous sheet that is seamless in the planar direction.
  • ⁇ 36> The elastic filament is directly welded to the nonwoven fabric, The elastic sheet according to any one of ⁇ 25> to ⁇ 35>.
  • ⁇ 37> The stretchable sheet has a wavy shape at the interface between the two layers of the nonwoven fabric.
  • ⁇ 38> The fiber constituting the convex part is peeled off from the elastic filament,
  • ⁇ 39> The fiber density of the convex part is lower than the fiber density of the flat part, The elastic sheet according to any one of ⁇ 25> to ⁇ 38>.
  • ⁇ 40> In the thickness direction, it is configured such that the convex portion on the other surface is located at the position of the convex portion on one surface of the stretchable sheet, and the flat portion on one surface is located on the other surface.
  • the non-convex part is located,
  • ⁇ 41> The plurality of convex portions are continuously continuous along the second direction.
  • ⁇ 42> The height of the first protrusion is not less than 0.5 times and not more than 0.8 times the height of the second protrusion.
  • the height of the first convex portion is not less than 0.6 times and not more than 0.7 times the height of the second convex portion
  • the ratio of the height of the protrusions to the distance between the protrusions is 1 or less.
  • the convex portion constitutes a stretchable portion that is stretchable in the first direction
  • the flat portion constitutes a connecting portion that is less likely to expand and contract in the first direction than the expandable portion.
  • An absorbent article comprising the elastic sheet according to any one of ⁇ 25> to ⁇ 45>.
  • the absorbent article an absorbent body located in the crotch; A waist portion having an abdominal side portion and a dorsal side portion located around the waist, wherein at least one of the abdominal side portion and the back side portion is configured using the stretchable sheet that is stretchable in a circumferential direction of the torso; , The crotch part which is located between the ventral part and the dorsal part and holds the absorber together with the ventral part and the dorsal part,
  • the first convex portion is disposed in a center region located in the center of each region obtained by dividing the waist portion into three equal parts in a direction orthogonal to the circumferential direction
  • the second convex portion is disposed in at least one of the pair of end regions located opposite to each other via the central region,
  • the absorbent article as described in ⁇ 46>.
  • the second convex portion is disposed in both of a pair of end regions located opposite to each other through the central region of the waist portion formed of the stretchable sheet.
  • the absorbent article includes an exterior body and the absorbent body, The exterior body has the stretchable sheet;
  • the exterior body includes the stretchable sheet and a base sheet, The stretchable sheet and the base sheet are joined without an elastic body, The absorbent article as described in ⁇ 49>.
  • the absorbent article is a disposable diaper for infants, The absorbent article according to any one of ⁇ 46> to ⁇ 50>.
  • ⁇ 52> Supplying a heated elastic filament between the first nonwoven fabric and the second nonwoven fabric and laminating the laminate by applying pressure; and Having a stretching step of performing a roll stretching process by passing the laminate through a pair of tooth gap stretching rolls;
  • the tooth gap extending roll has a high tooth depth portion and a low tooth depth portion whose tooth depth is lower than that of the high tooth depth portion.
  • a method for producing an elastic sheet. ⁇ 53> The tension applied to the stretchable sheet after the stretching step is made weaker than the tension applied to the laminate before the stretching process, The manufacturing method of the elastic sheet as described in said ⁇ 52>.
  • ⁇ 54> Extending the stretchable sheet produced by the production method according to ⁇ 52> or ⁇ 53> at a constant elongation rate, and bonding the substrate sheet to obtain an exterior body; Having a step of overlapping the absorbent body and the exterior body, Manufacturing method of absorbent article.
  • ⁇ 55> Joining the stretchable sheet and the base sheet without an elastic body, The method for producing an absorbent article according to ⁇ 54>.
  • the appearance and tactile sensation close to the underwear pants (cloth) are exhibited while maintaining the basic performance as fit and diapers.
  • seat which has the area

Landscapes

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

Abstract

Un article absorbant de type culotte selon un mode de réalisation de la présente invention comprend un corps absorbant, une partie de taille et une partie d'entrejambe. Le corps absorbant est situé au niveau de l'entrejambe. La partie de taille a une section côté ventre et une section côté arrière qui sont situées autour d'un tronc. La partie d'entrejambe est située entre la section côté ventre et la section côté arrière, et maintient le corps absorbant conjointement avec la section côté ventre et la section côté arrière. Au moins l'une parmi la section côté ventre et la section côté arrière est constituée d'une feuille étirable comprenant une première région et une seconde région située sur un côté verticalement supérieur dans la direction verticale perpendiculaire à la direction circonférentielle du tronc. La feuille étirable est constituée en incluant une résine élastique et une couche de tissu non tissé comprenant la résine élastique, les contraintes de retrait circonférentielles de celle-ci diffèrent dans la première région et la seconde région, et les dimensions de la première région et de la seconde région sont les mêmes dans la direction circonférentielle dans un état naturel.
PCT/JP2019/008835 2018-04-02 2019-03-06 Article absorbant de type culotte WO2019193906A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2013122.3A GB2585293B (en) 2018-04-02 2019-03-06 Pant-type absorbent article
DE112019000549.9T DE112019000549T5 (de) 2018-04-02 2019-03-06 Absorptionsartikel vom Höschentyp
RU2020128594A RU2757895C1 (ru) 2018-04-02 2019-03-06 Впитывающее изделие типа трусов
CN201980005870.9A CN111405887B (zh) 2018-04-02 2019-03-06 短裤型吸收性物品

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2018-071050 2018-04-02
JP2018071051A JP7037990B2 (ja) 2018-04-02 2018-04-02 伸縮シート
JP2018-071051 2018-04-02
JP2018071050A JP7118704B2 (ja) 2018-04-02 2018-04-02 パンツ型吸収性物品

Publications (1)

Publication Number Publication Date
WO2019193906A1 true WO2019193906A1 (fr) 2019-10-10

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PCT/JP2019/008835 WO2019193906A1 (fr) 2018-04-02 2019-03-06 Article absorbant de type culotte

Country Status (5)

Country Link
CN (1) CN111405887B (fr)
DE (1) DE112019000549T5 (fr)
GB (1) GB2585293B (fr)
RU (1) RU2757895C1 (fr)
WO (1) WO2019193906A1 (fr)

Cited By (2)

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EP3960141A1 (fr) * 2020-08-31 2022-03-02 W. Pelz GmbH & Co. KG Article d'hygiène sous la forme de culotte
WO2022145210A1 (fr) * 2021-01-04 2022-07-07 花王株式会社 Article absorbant de type sous-vêtement

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JP2003136591A (ja) * 2001-11-05 2003-05-14 Kao Corp 伸縮性シート部材の製造方法
JP2008061691A (ja) * 2006-09-05 2008-03-21 Kao Corp 伸縮性シートの製造方法
WO2010104429A1 (fr) * 2009-03-11 2010-09-16 Sca Hygiene Products Ab Article absorbant comprenant un stratifié élastique et son procédé de fabrication
JP2010284228A (ja) * 2009-06-09 2010-12-24 Kao Corp 吸収性物品
JP2016120031A (ja) * 2014-12-24 2016-07-07 ユニ・チャーム株式会社 使い捨て着用物品
JP2016154654A (ja) * 2015-02-24 2016-09-01 日本製紙クレシア株式会社 パンツ型吸収性物品
WO2017169338A1 (fr) * 2016-03-30 2017-10-05 大王製紙株式会社 Structure d'étirement/de contraction d'un article absorbant et son procédé de fabrication

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JPH07116191A (ja) * 1993-09-02 1995-05-09 Kao Corp パンツ型の使い捨ておむつ
RU24771U1 (ru) * 2002-04-19 2002-08-27 Окульская Татьяна Анатольевна Одноразовые трусы
JP5969415B2 (ja) * 2013-03-11 2016-08-17 花王株式会社 伸縮シートの製造方法
JP5705347B2 (ja) * 2013-06-28 2015-04-22 花王株式会社 パンツ型着用物品及びその製造方法
JP6276971B2 (ja) * 2013-11-11 2018-02-07 花王株式会社 複合伸縮シート及びその製造方法

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Publication number Priority date Publication date Assignee Title
JP2003136591A (ja) * 2001-11-05 2003-05-14 Kao Corp 伸縮性シート部材の製造方法
JP2008061691A (ja) * 2006-09-05 2008-03-21 Kao Corp 伸縮性シートの製造方法
WO2010104429A1 (fr) * 2009-03-11 2010-09-16 Sca Hygiene Products Ab Article absorbant comprenant un stratifié élastique et son procédé de fabrication
JP2010284228A (ja) * 2009-06-09 2010-12-24 Kao Corp 吸収性物品
JP2016120031A (ja) * 2014-12-24 2016-07-07 ユニ・チャーム株式会社 使い捨て着用物品
JP2016154654A (ja) * 2015-02-24 2016-09-01 日本製紙クレシア株式会社 パンツ型吸収性物品
WO2017169338A1 (fr) * 2016-03-30 2017-10-05 大王製紙株式会社 Structure d'étirement/de contraction d'un article absorbant et son procédé de fabrication

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3960141A1 (fr) * 2020-08-31 2022-03-02 W. Pelz GmbH & Co. KG Article d'hygiène sous la forme de culotte
WO2022043583A1 (fr) * 2020-08-31 2022-03-03 W. Pelz Gmbh & Co. Kg Article d'hygiène sous forme de culotte
WO2022145210A1 (fr) * 2021-01-04 2022-07-07 花王株式会社 Article absorbant de type sous-vêtement

Also Published As

Publication number Publication date
GB2585293A (en) 2021-01-06
CN111405887B (zh) 2021-10-22
RU2757895C1 (ru) 2021-10-22
CN111405887A (zh) 2020-07-10
GB202013122D0 (en) 2020-10-07
GB2585293B (en) 2022-09-07
DE112019000549T5 (de) 2020-10-08

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