CN113260342A - Method for manufacturing composite sheet, method for manufacturing absorbent article, composite sheet, and absorbent article - Google Patents

Method for manufacturing composite sheet, method for manufacturing absorbent article, composite sheet, and absorbent article Download PDF

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Publication number
CN113260342A
CN113260342A CN201980086231.XA CN201980086231A CN113260342A CN 113260342 A CN113260342 A CN 113260342A CN 201980086231 A CN201980086231 A CN 201980086231A CN 113260342 A CN113260342 A CN 113260342A
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CN
China
Prior art keywords
sheet
continuous
composite sheet
manufacturing
stretchable member
Prior art date
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Pending
Application number
CN201980086231.XA
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Chinese (zh)
Inventor
桥野夕贵
安田翠
石川康之
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Unicharm Corp
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Unicharm Corp
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Publication date
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Publication of CN113260342A publication Critical patent/CN113260342A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • 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
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties

Abstract

The present invention can obtain a composite sheet having high cushioning properties, which can improve the degree of freedom in the arrangement of the joint portion and the stretchable member in the composite sheet. The method (S100) for producing the composite sheet comprises: a first sheet forming step (S11) for forming a first continuous sheet (C71) from a laminated continuous body (C76) in which sheets that are continuous in the conveying direction are laminated; a second sheet conveying step (S21) for conveying a second continuous sheet (C72); an adhesive applying step (S31) in which an adhesive for bonding a stretchable member (73) provided between a first continuous sheet and a second continuous sheet is applied to at least one of the first continuous sheet, the second continuous sheet, and the stretchable member; and an extensible member arranging step (S41) of bonding the extensible member in the extended state between the first continuous sheet and the second continuous sheet via the adhesive. In the first sheet forming step, a plurality of joint portions are formed on the laminated continuous body at intervals in a plan view.

Description

Method for manufacturing composite sheet, method for manufacturing absorbent article, composite sheet, and absorbent article
Technical Field
The present invention relates to a composite sheet used for an absorbent article or the like, a method for producing the composite sheet, an absorbent article having the composite sheet, and a method for producing the absorbent article.
Background
Patent document 1 discloses a composite sheet constituting a waist belt of an absorbent article. The composite sheet of patent document 1 includes an inner layer sheet, an outer layer sheet laminated on the inner layer sheet, a linear stretchable member disposed between the inner layer sheet and the outer layer sheet, and a joint portion joining the inner layer sheet and the outer layer sheet. The stretchable member extends in the width direction, and is disposed in plurality at intervals in the front-rear direction. The plurality of joining portions are arranged at intervals in the width direction and the front-rear direction. The stretchable member contracts, whereby the sheet between the adjacent joint portions is deformed so as to bulge in the thickness direction, and wrinkles formed by the sheet are formed between the adjacent joint portions.
Prior art documents
Patent document
Patent document 1: japanese laid-open patent publication No. 2015-192862
Disclosure of Invention
The joint portion of the composite sheet of patent document 1 joins the inner layer sheet and the outer layer sheet by thermal welding. In order to manufacture the composite sheet configured as described above, an elastic member is disposed between the inner layer sheet and the outer layer sheet, and then a joint portion is formed by thermal fusion bonding. For example, if the joint portion is formed so as to overlap with the stretchable member, there is a possibility that the stretchability of the stretchable member is hindered by the process of forming the joint portion by thermal welding. Therefore, the joint portion must be formed in a region not overlapping with the stretchable member, and the arrangement of the joint portion and the stretchable member is limited, so that wrinkles cannot be formed in a desired shape at a desired position, and a composite sheet having a desired cushioning property cannot be obtained. Therefore, an object of the present invention is to obtain a composite sheet having high cushioning properties by improving the degree of freedom in the arrangement of the joint portion and the stretchable member in the composite sheet.
A method for manufacturing a composite sheet according to one embodiment includes: a first sheet forming step of forming a first continuous sheet using a laminated continuous body in which sheets continuous in a conveying direction are laminated; a second sheet conveying step of conveying a second continuous sheet that is continuous in a conveying direction; an adhesive applying step of applying an adhesive for bonding a stretchable member provided between the first continuous sheet and the second continuous sheet to at least one of the first continuous sheet, the second continuous sheet, and the stretchable member; and an extensible member arranging step of adhering the extensible member in an extended state between the first continuous sheet and the second continuous sheet via the adhesive, wherein in the first sheet forming step, a plurality of joint portions are formed at intervals in a plan view on the laminated continuous body.
A method of manufacturing an absorbent article according to one aspect is a method of manufacturing an absorbent article having a front waistline region, a crotch region, and a rear waistline region, and the method of manufacturing an absorbent article includes a belt forming step of forming a waistline disposed in at least one of the front waistline region and the rear waistline region using a composite sheet obtained by a method of manufacturing a composite sheet.
A composite sheet of one form has: a first sheet having a laminate formed by laminating two or more sheets; a second sheet disposed to overlap with the first sheet; and an extensible member disposed between the first sheet and the second sheet and extensible and contractible in a first direction, wherein a joint portion to which the sheets constituting the laminate are joined is provided in the first sheet so as not to reach the second sheet, and a plurality of the joint portions are provided at intervals in a plan view.
An absorbent article of one form has: a front-rear direction and a width direction orthogonal to the front-rear direction; a front waistline region; a rear waist region; a crotch region disposed between the front waistline region and the rear waistline region; an absorbent main body disposed so as to straddle the crotch region, the front waistline region, and the rear waistline region; and a waist belt disposed on a non-skin surface side of the absorbent main body in at least one of the front waistline region and the rear waistline region, wherein the waist belt includes a composite sheet.
Drawings
Fig. 1 is a front view of an absorbent article of an embodiment.
Fig. 2 is a plan view of the absorbent article of the embodiment.
Fig. 3 is a sectional view taken along the line a-a of the absorbent article shown in fig. 2.
Fig. 4 is a plan view of the composite sheet shown in fig. 2 at the portion B.
Fig. 5 is a cross-sectional view taken along line C-C of the composite sheet shown in fig. 4.
Fig. 6 is a view showing a deformed state of the composite sheet.
Fig. 7 is a view for explaining a method of manufacturing the composite sheet.
Fig. 8 is a plan view of a composite sheet according to a modification.
Detailed Description
(1) Brief description of the embodiments
At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A method for manufacturing a composite sheet according to one embodiment includes: a first sheet forming step of forming a first continuous sheet using a laminated continuous body in which sheets continuous in a conveying direction are laminated; a second sheet conveying step of conveying a second continuous sheet that is continuous in the conveying direction; an adhesive applying step of applying an adhesive for bonding a stretchable member provided between the first continuous sheet and the second continuous sheet to at least one of the first continuous sheet, the second continuous sheet, and the stretchable member; and an extensible member arranging step of adhering the extensible member in an extended state between the first continuous sheet and the second continuous sheet via the adhesive, wherein in the first sheet forming step, a plurality of joint portions are formed at intervals in a plan view on the laminated continuous body. The first continuous sheet and the second continuous sheet are contracted by contraction of the stretchable member. By contraction of the stretchable member, the region between the joint portions of the first continuous sheet is deformed so as to swell in the thickness direction, and a wrinkle formed by the first continuous sheet can be formed between the adjacent joint portions. In addition, a wrinkle is formed in the second sheet by contraction of the stretchable member. Therefore, the composite sheet obtained by the production method has wrinkles formed on the surface thereof, and the cushioning property is improved. Therefore, a composite sheet having high cushioning properties can be obtained by the joint and the stretchable member. Further, since the first continuous sheet body having the joint portions formed thereon is bonded to the stretchable member, the stretchability of the stretchable member is not hindered by the step of forming the joint portions. Therefore, the limitation of the arrangement of the joint portion and the stretchable member is reduced, and the degree of freedom of the arrangement of the joint portion and the stretchable member can be improved. Wrinkles can be formed in a desired shape at a desired position, and a composite sheet having a desired cushioning property can be obtained.
According to a preferred aspect, the joining portions may be formed at intervals in the conveying direction in the first sheet forming step, and the stretchable member that has been stretched in the conveying direction may be bonded in the stretchable member arranging step. By providing the joint portions at intervals in the conveying direction, wrinkles based on the presence or absence of the joint portions can be alternately formed in the conveying direction. In addition, since the stretchable member is contracted in the conveying direction, wrinkles of the first continuous sheet can be formed more finely.
According to a preferred aspect, in the first sheet forming step, the joint portion extending in the orthogonal direction may be formed in a region spanning a plurality of stretchable members arranged at intervals in the orthogonal direction orthogonal to the conveying direction. The joint is provided so as to span the stretchable members arranged at intervals in the orthogonal direction, whereby the gathers formed by the joint are extended in the orthogonal direction. The wrinkles can be formed by contraction of the plurality of stretchable members, the accuracy of the wrinkles can be improved, and the shape of the wrinkles can be easily maintained.
According to a preferred aspect, in the first sheet forming step, the joint portion may be formed by ultrasonic welding or embossing. Ultrasonic welding and embossing can convey the laminated continuous body at high speed to form a joint. In addition, the degree of freedom of the arrangement of the joint portion is relatively high, and wrinkles can be further formed in a desired shape at a desired position.
According to another aspect, in the first sheet forming step, the adhesive may be applied by coating with a coater to form the joint portion. The rigidity of the area coated with the adhesive by the coater application may become high due to the adhesive. By increasing the rigidity of the first sheet, the first sheet is prevented from being wrinkled, and a desired wrinkle is easily formed.
According to a preferred aspect, in the adhesive applying step, the adhesive may be applied to the stretchable member. In comparison with the form in which the adhesive is applied to the first continuous sheet and the second continuous sheet, the adhesive is less likely to bleed out to the outer surface of the composite sheet, and adhesion of the adhesive to the conveyance path of the composite sheet can be suppressed. Further, the adhesive is less likely to bleed out to the surface of the composite sheet obtained by the production method, and the feel of the absorbent article provided with the composite sheet can be improved.
According to a preferred aspect, in the stretchable member arranging step, the first continuous sheet may be brought into contact with the second continuous sheet in a region that does not overlap with the stretchable member in the thickness direction. According to this aspect, a region where no member other than the stretchable member is disposed is provided between the first continuous sheet and the second continuous sheet. The contraction force generated by the stretchable member is more easily transmitted to the first continuous sheet and the second continuous sheet than in the case where the member other than the stretchable member is disposed. Therefore, wrinkles can be formed on the composite sheet by contraction of the stretchable member, and a composite sheet having high cushioning properties can be obtained.
According to a preferred aspect, the method for manufacturing the composite sheet may include a laminate forming step of forming a laminate continuous body by folding a sheet continuous in the conveying direction with a fold line along the conveying direction as a base point, and the first sheet forming step may be performed after the laminate forming step. By folding the sheet to form the laminated continuous body, the number of components can be reduced and the man-hours for managing the components can be reduced as compared with a structure in which separate sheets are laminated to form the laminated continuous body. Further, one end of the laminated continuous body formed by folding the sheets in the orthogonal direction is a fold line, and positional displacement in the orthogonal direction of the laminated sheets does not occur at the one end. Therefore, as compared with a structure in which separate sheets are stacked to form a stacked continuous body, positional displacement in the orthogonal direction of the stacked sheets can be suppressed. In addition, air between sheets constituting the laminated continuous body is less likely to leak out, a gap is likely to be formed between the sheets, and the cushioning property of the laminated continuous body is improved, so that the cushioning property of the composite sheet obtained by the manufacturing method can be further improved.
According to a preferred aspect, in the laminate forming step, the folded sheets may be separated from each other to form the continuous laminate. Gaps are easily formed between sheets constituting the laminated continuous body, the cushioning property of the laminated continuous body is improved, and the cushioning property of the composite sheet obtained by the manufacturing method can be further improved.
According to another aspect, in the laminate forming step, the sheets constituting the continuous laminate may be joined to each other via an adhesive having a lower weight per unit area than an adhesive provided between the first continuous sheet and the second continuous sheet. Since the weight per unit area of the adhesive provided between the first continuous sheet and the second continuous sheet is high, the joining strength of the stretchable member to the first continuous sheet and the second continuous sheet is high, and the shrinkage of the stretchable member is easily transmitted to the first continuous sheet and the second continuous sheet. Further, since the adhesive of the continuous laminated body has a low basis weight, the sheet constituting the continuous laminated body is easily deformed flexibly, and wrinkles are easily formed in the continuous laminated body. Therefore, the cushioning property of the laminated continuous body is improved, and the cushioning property of the composite sheet obtained by the manufacturing method can be improved. In addition, the material cost of the adhesive can be reduced, and the manufacturing process can be simplified.
According to a preferred aspect, in the stretchable member arranging step, the linear or belt-shaped stretchable members may be arranged at intervals in a direction orthogonal to the conveying direction. The degree of freedom in the arrangement of the stretchable member 73 can be improved without hindering the stretchability of the stretchable member in the step of forming the joint. By increasing the degree of freedom in the arrangement of the stretchable member, wrinkles can be formed in a desired shape at a desired position, and a composite sheet having a desired cushioning property can be obtained.
A method of manufacturing an absorbent article according to one aspect is a method of manufacturing an absorbent article having a front waistline region, a crotch region, and a rear waistline region, and the method of manufacturing an absorbent article includes a belt forming step of forming a waistline disposed in at least one of the front waistline region and the rear waistline region using a composite sheet obtained by the method of manufacturing a composite sheet described above. By providing the waist belt with the composite sheet having high cushioning properties, the skin feel at the waist can be improved.
According to a preferred aspect, in the belt forming step, the first continuous sheet side of the composite sheet may be disposed on a skin surface side of the absorbent article to form the waist belt. Since wrinkles are more likely to form on the first continuous sheet side, the cushioning property on the side in contact with the skin can be improved, and the skin feel of the wearer can be improved.
According to a preferred aspect, in the belt forming step, the second continuous sheet side of the composite sheet may be disposed on the skin surface side of the absorbent article to form the waist belt. Since wrinkles are more likely to form on the first continuous sheet side, the tactile sensation of the absorbent article when it is touched from the outside can be improved.
According to a preferred aspect, the method of manufacturing an absorbent article may include: an absorbent body forming step of forming an absorbent body by laminating an absorbent core having an absorbent material, a skin-side sheet disposed on a skin surface side of the absorbent core, and a non-skin-side sheet disposed on a non-skin surface side of the absorbent core; and a belt joining step of joining the absorbent main body obtained in the absorbent main body forming step and the waist belt obtained in the belt forming step. According to this aspect, the waist belt and the absorbent main body are manufactured separately, and thus the waist belt and the absorbent main body can be manufactured stably with desired specifications. By providing the waist belt with the composite sheet having high cushioning properties, an absorbent article having excellent skin feel can be obtained.
A composite sheet of one form has: a first sheet having a laminate formed by laminating two or more sheets; a second sheet disposed to overlap with the first sheet; and an extensible member that is joined to the first sheet and the second sheet between the first sheet and the second sheet and that extends and contracts in a first direction, wherein a joining portion at which the sheets constituting the laminate are joined is provided in the first sheet so as not to reach the second sheet, and the joining portion is provided in plurality at intervals in a plan view. The composite sheet contracts the first sheet and the second sheet in the first direction by contraction of the elastic member. By contraction of the stretchable member, the region between the joined portions of the first sheet is deformed so as to swell in the thickness direction, and a wrinkle formed by the first sheet can be formed between the adjacent joined portions. In addition, the second sheet is also contracted by contraction of the stretchable member, and a wrinkle is formed in the second sheet. Therefore, the composite sheet has wrinkles formed on the surface thereof, and the cushioning property is improved. Further, since the joint portion of the first sheet is not formed in the second sheet, the stretchability of the stretchable member is not hindered by the step of forming the joint portion. Therefore, the limitation of the arrangement of the joint portion and the stretchable member is reduced, and the degree of freedom of the arrangement of the joint portion and the stretchable member can be improved. Wrinkles can be formed in a desired shape at a desired position, and a composite sheet having a desired cushioning property can be obtained. Further, since the joint portion of the first sheet is not formed in the second sheet, the wrinkle formed in the first sheet and the wrinkle formed in the second sheet are formed at different positions and in different forms. The cushioning properties are further improved as compared with a structure in which the gathers formed in the first sheet and the gathers formed in the second sheet are integrated.
According to a preferred aspect, the stretchable member may be provided in a plurality at intervals in a second direction orthogonal to the first direction, and the joint may be disposed across the plurality of stretchable members. By providing the joint portion across the plurality of stretchable members, the wrinkles can be formed by contraction of the plurality of stretchable members, the accuracy of the wrinkles can be improved, and the shape of the wrinkles can be easily maintained.
According to a preferred aspect, the composite sheet may have an abutment region in which the first sheet abuts against the second sheet. A region where no member other than the stretchable member is disposed is provided between the first sheet and the second sheet. The contraction force generated by the stretchable member is more easily transmitted to the first sheet and the second sheet than in the case where the member other than the stretchable member is disposed. Therefore, wrinkles can be formed on the composite sheet by contraction of the stretchable member, and a composite sheet having high cushioning properties can be obtained.
According to a preferred aspect, a fold line formed by folding the sheets constituting the laminated body may be provided at an end edge of the laminated body. By forming the laminated body with the folded sheets, the number of components can be reduced as compared with a laminated body in which separate sheets are laminated. Further, the end edge of the laminate provided with the fold does not cause positional displacement of the laminated sheets. The positional displacement of the sheets constituting the laminate is suppressed, and the accuracy of the absorbent article can be improved. In addition, air between sheets constituting the laminate is difficult to leak. Gaps are easily formed between the sheets, the cushioning property of the laminate is improved, and the cushioning property of the composite sheet can be further improved.
According to a preferred aspect, the sheets constituting the laminate may be bonded to each other via an adhesive, the stretchable member may be bonded between the first sheet and the second sheet via an adhesive, and the weight per unit area of the adhesive bonding the laminate may be lower than the weight per unit area of the adhesive bonding the first sheet and the second sheet. Since the weight per unit area of the adhesive provided between the first sheet and the second sheet is high, the joining strength of the stretchable member to the first sheet and the second sheet is high, and the contraction of the stretchable member is easily transmitted to the first sheet and the second sheet. Further, since the adhesive of the laminate has a low basis weight, the sheets constituting the laminate are easily deformed flexibly, and wrinkles are easily formed in the laminate. Therefore, the cushioning properties of the laminate are improved, and the cushioning properties of the composite sheet obtained by the production method can be improved.
According to a preferred aspect, the stretchable member may be provided in plurality at intervals in a second direction orthogonal to the first direction, the joint portion may be provided in plurality at intervals in the second direction, and a pitch of the joint portion in the second direction may be shorter than a pitch of the stretchable member in the second direction. Since the plurality of joining portions are arranged at intervals in the second direction, wrinkles extending in the second direction can be formed. In addition, since the pitch of the joint portion is short, finer wrinkles can be formed in a desired form.
An absorbent article of one form has: a front-rear direction and a width direction orthogonal to the front-rear direction; a front waistline region; a rear waist region; a crotch region disposed between the front waistline region and the rear waistline region; an absorbent main body disposed so as to straddle the crotch region, the front waistline region, and the rear waistline region; and a waist belt overlapping the absorbent main body in the thickness direction in at least one of the front waistline region and the back waistline region, wherein the waist belt includes the composite sheet described above. By providing the waist belt with the composite sheet having high cushioning properties, the skin feel at the waist can be improved.
According to a preferred aspect, the first sheet of the composite sheet may be positioned closer to the skin surface side than the second sheet. Since wrinkles are more easily formed in the first sheet, the cushioning property on the side in contact with the skin can be improved, and the skin feel of the wearer can be improved.
According to a preferred aspect, the first sheet and the second sheet may be made of a nonwoven fabric or a woven fabric having fibers, and the weight per unit area of the fibers of the first sheet may be higher than the weight per unit area of the fibers of the second sheet. Since the first sheet has a high basis weight, wrinkles formed in the first sheet are less likely to be crushed, and the wrinkles are easily maintained. Therefore, the cushioning property of the first sheet is further improved, and the tactile sensation of the skin can be improved.
According to a preferred aspect, a first fold line formed by folding the sheets constituting the laminate may be provided along the width direction at an outer edge in the front-rear direction of the first sheet, and the first fold line may be disposed outside the outer edge in the front-rear direction of the absorbent main body. In the first sheet, the region near the first fold line easily forms a gap between the sheets folded via the first fold line, and the thickness of the first sheet easily increases. The region on the front-rear direction outer side of the outer end edge of the absorbent main body is more likely to have a difference in thickness than the region where the absorbent main body is disposed, but the difference in thickness can be made up for by the thickness of the region near the first fold of the first sheet. Therefore, the difference in thickness of the waist band is reduced, and the skin feel can be improved.
According to a preferred aspect, a second fold line formed by folding the second sheet may be provided along the width direction at an outer edge in the front-rear direction of the second sheet, the second fold line may be disposed at a position further outward in the front-rear direction than the outer edge in the front-rear direction of the absorbent main body, and the first fold line of the first sheet may be disposed between the second sheets folded via the second fold line. The region on the front-rear direction outer side of the outer end edge of the absorbent main body is more likely to have a difference in thickness than the region where the absorbent main body is disposed, but the difference in thickness can be further compensated by the thickness of the region in the vicinity of the second fold of the second sheet. Further, since the first fold of the first sheet is disposed between the second sheets folded via the second fold, the bulge near the second fold can be provided so as to overlap with the bulge of the sheet near the first fold. The difference in thickness of the waist band is further reduced, and the skin feel can be improved.
(2) General structure of absorbent article
Hereinafter, an absorbent article according to an embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and it should be noted that the ratio of the dimensions and the like are different from those in reality. Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, the drawings may include portions having different dimensional relationships or ratios from each other. The absorbent article may be of a belt type or a pants type. The absorbent article may be a disposable diaper or a pants-type sanitary napkin. The absorbent article of the embodiment is a pants-type disposable diaper. Fig. 1 is a schematic front view of an absorbent article 10 of the present embodiment. Fig. 2 is a schematic plan view of the disposable diaper 10 of the present embodiment. Fig. 3 is a sectional view taken along line a-a shown in fig. 2. Fig. 2 and 3 show an extended state in which the absorbent article 10 is extended to a state in which no gathers are formed in a state in which the side joint portions 60 described later are unfolded. In the cross-sectional view shown in fig. 3, the respective members are shown separately in the thickness direction T for convenience of explanation, but in an actual product, they are in contact with each other in the thickness direction T.
The absorbent article 10 has a front-back direction L and a width direction W that are orthogonal to each other. The front-back direction L is defined by a direction extending to the front side and the back side of the body. In other words, the front-rear direction L is a direction extending in the front-rear direction in the unfolded absorbent article 10. The absorbent article 10 has a thickness direction orthogonal to both the front-back direction L and the width direction W. The absorbent article 10 has a front waistline region S1, a rear waistline region S2, and a crotch region S3. The front waistline region S1 is a region that faces the front waistline (abdomen) of the wearer. The back waistline region S2 is a region that faces the back waistline (back) of the wearer. The crotch region S3 is a region located in the crotch of the wearer and disposed between the front waistline region S1 and the rear waistline region S2. The crotch region S3 is a region in which the leg hole openings 66 (see fig. 1) described later are formed. The boundary on the crotch region side of the front waistline region S1 is the front end edge of the leg hole openings 66, and the boundary on the crotch region side of the rear waistline region S2 is the rear end edge of the leg hole openings 66.
The absorbent article 10 may have an absorbent main body 40 and a waist belt 15. The waist belt 15 overlaps the absorbent main body 40 in the thickness direction. The waist belt 15 may have a front waist belt 20 and a rear waist belt 30. The front waist belt 20 is disposed in the front waistline region S1 in a region overlapping with the absorbent main body 40 and a region not overlapping with the absorbent main body 40. The rear waist belt 30 is separated from the front waist belt 20 in the front-rear direction L. The rear waist belt 30 is disposed in the rear waist region S2 in a region overlapping with the absorbent main body 40 and a region not overlapping with the absorbent main body 40. In another embodiment, the waist belt 15 may be formed by integrating the front waist belt 20 and the rear waist belt 30 so as to extend from the front waistline region S1 to the rear waistline region S2.
As shown in fig. 3, the front waist belt 20 may have: a front cover sheet 27, the front cover sheet 27 being disposed on the skin surface side T1 of the absorbent main body 40; a front first outer sheet 25, the front first outer sheet 25 being disposed on the non-skin surface side T2 of the absorbent main body 40; a front second exterior sheet 26, the front second exterior sheet 26 being positioned on the non-skin surface side T2 of the front first exterior sheet 25; and an outer-covering stretchable sheet 28, the outer-covering stretchable sheet 28 being disposed between the front first outer-covering sheet 25 and the front second outer-covering sheet 26. In the region not overlapping the absorbent main body 40, the front cover sheet 27, the front first outer sheet 25, the outer stretchable sheet 28, and the front second outer sheet 26 are laminated in this order from the skin surface side T1 toward the non-skin surface side T2 and joined to each other. The front cover sheet 27, the front first exterior sheet 25, and the front second exterior sheet 26 may be formed of different sheets or may be formed of the same sheet that is folded back. The front cover sheet 27, the front first exterior sheet 25, the front second exterior sheet 26, and the exterior stretchable sheet 28 may constitute the composite sheet 70 of the present invention. The front cover sheet 27 and the front first outer sheet 25 may constitute a first sheet 71 of the present invention, the front second outer sheet 26 may constitute a second sheet 72 of the present invention, and the outer stretchable sheet 28 may constitute a stretchable member 73 of the present invention. Further, the composite sheet 70 will be described in detail later.
As shown in fig. 3, the rear waist belt 30 may have: a back cover sheet 37, the back cover sheet 37 being disposed on the skin surface side T1 of the absorbent main body 40; a rear first outer sheet 35, the rear first outer sheet 35 being disposed on the non-skin surface side T2 of the absorbent main body 40; a rear second exterior sheet 36, the rear second exterior sheet 36 being positioned on the non-skin surface side T2 of the rear first exterior sheet 35; and a rear side elastic thread 38, the rear side elastic thread 38 being disposed between the rear first exterior sheet 35 and the rear second exterior sheet 36. The rear cover sheet 37, the rear first outer sheet 35, the rear elastic thread 38, and the rear second outer sheet 36 may be laminated in this order from the skin surface side T1 toward the non-skin surface side T2 in a region not overlapping the absorbent main body 40 and joined to each other. The rear third outer sheet 39 may be disposed on the skin surface side of the rear first outer sheet 35. In the region where the rear third exterior sheet 39 is disposed, the rear cover sheet 37, the rear third exterior sheet 39, the rear first exterior sheet 35, the rear elastic cord 38, and the rear second exterior sheet 36 may be laminated in this order from the skin surface side T1 toward the non-skin surface side T2 and joined to each other. The rear cover sheet 37, the rear first exterior sheet 35, the rear second exterior sheet 36, and the rear third exterior sheet 39 may be formed of different sheets or may be formed of the same sheet that is folded back. In the present embodiment, the second outer sheet 36 and the third outer sheet 39 are formed of the same sheet folded back at the waist opening 62. The rear first outer sheet 35, the rear second outer sheet 36 and the rear side elastic 38 may constitute the composite sheet 70 of the present invention. The rear first outer sheet 35 may constitute the first sheet 71 of the present invention, the front second outer sheet 26 may constitute the second sheet 72 of the present invention, and the rear elastic thread 38 may constitute the stretchable member 73 of the present invention.
As shown in fig. 1, side joint portions 60 may be provided, the side joint portions 60 joining the ends of the front waistline region S1 in the width direction W to the ends of the rear waistline region S2 in the width direction W. The side joint portions 60 are defined by portions that lock the ends of the front waistline region S1 and the ends of the rear waistline region S2 in the width direction W to each other. The outer portion in the present invention means a portion that occupies a certain range in the width direction W including the outer edge in the width direction W, and the outer edge means the outer edge in the width direction W. The inner side portion in the present invention means a portion that occupies a certain range in the width direction W including an inner edge in the width direction W, and the inner edge means an inner edge in the width direction W. In the present invention, the front end portion and the rear end portion are portions that occupy a certain range in the front-rear direction L including edges in the front-rear direction L, and the front end edge and the rear end edge are edges in the front-rear direction L. The outer end portion comprises a front end portion and a rear end portion, and the outer end edge comprises a front end edge and a rear end edge.
As shown in fig. 1, the absorbent article 10 is formed with a waist opening 62 through which the waist of the wearer passes and a pair of leg openings 66 into which the legs of the wearer are inserted, in a state where the side joint sections 60 are formed. The waist opening 62 may be defined by a front end edge S1F of the front waist region S1 and a rear end edge S2R of the rear waist region S2. Here, fig. 2 shows a state in which the side joint portions 60 are disengaged and the absorbent article 10 is unfolded. The side joint portions 60 may extend in the front-rear direction L at the front waist belt 20 and the rear waist belt 30, respectively. In the pants-type absorbent article, the boundary between the front waistline region S1 and the crotch region S3 may be defined by the rear end edge of the side joint portion 60 provided in the front waist band 20. Similarly, the boundary between the rear waistline region S2 and the crotch region S3 may be defined by the front end edge of the side joining portion 60 provided in the rear waist belt 30.
As shown in fig. 3, a stretchable member that is stretchable in the width direction W may be disposed in the front waistline region S1. The stretchable member may be formed of at least one of the front elastic thread 22 stretchable in the width direction W and the outer stretchable sheet 28 stretchable in the width direction W. Instead of this, the stretchable member may be formed of the front waist belt 20 itself made of a stretchable sheet, for example. A stretchable member stretchable in the width direction W may be disposed in the rear waist region S2. The stretchable member may be formed of at least one of a rear side elastic cord 38 stretchable in the width direction W and an outer covering stretchable sheet stretchable in the width direction W. Instead of this, the stretchable member may be constituted by the rear waist belt 30 itself constituted by a stretchable sheet, for example.
The absorbent main body 40 is disposed astride the front waist belt 20 and the rear waist belt 30. That is, the absorbent body 40 extends over the front waistline region S1, the rear waistline region S2, and the crotch region S3. The absorbent main body 40 may be configured separately from the front waist belt 20 and the rear waist belt 30. In this case, the absorbent main body 40 may be joined to the front waist belt 20 and the rear waist belt 30 in the front waistline region S1 and the rear waistline region S2, respectively. The absorbent main body 40 includes at least an absorbent core 50. The absorbent core 50 may for example comprise comminuted pulp or a Super Absorbent Polymer (SAP) or a mixture thereof. The absorbent core 50 is disposed in at least the crotch region S3. Preferably, the absorbent core 50 may extend in the front-back direction L from the front waistline region S1 to the back waistline region S2. The absorbent core 50 may be covered by a core cladding. Also, as shown in fig. 3, the absorbent main body 40 may have: a skin surface sheet 42A, the skin surface sheet 42A being disposed on the skin surface side of the absorbent core; a liquid-impermeable sheet 41, the liquid-impermeable sheet 41 being disposed on the non-skin surface side of the absorbent core 50; and a body sheet 42B, the body sheet 42B being disposed on the non-skin surface side T2 with respect to the liquid-impermeable sheet 41.
In the absorbent body 40 of the present embodiment, the skin-facing sheet 42A, the liquid-impermeable sheet 41, and the body sheet 42B are arranged in this order from the skin-facing side T1 toward the non-skin-facing side T2 in the region on the front side of the absorbent core. In the region overlapping the absorbent core 50, the skin-facing sheet 42A, the absorbent core 50, the liquid-impermeable sheet 41, and the main body sheet 42B are arranged in this order from the skin-facing side T1 toward the non-skin-facing side T2. The skin-facing sheet 42A and the liquid-impermeable sheet 41 may be disposed so as to sandwich the absorbent core 50 in the thickness direction T. The liquid-impermeable sheet 41 may be a film, for example, as long as it is liquid-impermeable. The skin-side sheet 42A and the body sheet 42B may be liquid-permeable, and may be formed of, for example, nonwoven fabric.
(3) Structure of composite sheet
Next, the structure of the composite sheet 70 will be described in detail with reference to fig. 3 to 5. Fig. 4 is a plan view of the composite sheet at the portion B shown in fig. 2, and fig. 5 is a sectional view taken along the line C-C shown in fig. 4. Fig. 4 and 5 show the composite sheet in an extended state. In fig. 4 and 5, the composite sheet at the B portion is shown, and the rear cover sheet 37 and the rear third outer sheet 39 among the members constituting the rear waist belt 30 are omitted. In the following description, a composite sheet in the rear waist belt will be described. However, as described above, the front waist belt 20 may have a composite sheet, and the structure of the composite sheet in the rear waist belt may be applied to the composite sheet in the front waist belt 20.
The composite sheet 70 has: a first sheet 71, the first sheet 71 having a laminate 76 in which two or more sheets are laminated; a second sheet 72, the second sheet 72 being disposed so as to overlap the first sheet 71; and an extensible member 73, the extensible member 73 being disposed between the first sheet 71 and the second sheet 72 and being extensible and contractible in the first direction D1. As described above, the rear first outer sheet 35 constitutes the first sheet 71, the rear second outer sheet 36 constitutes the second sheet 72, and the rear elastic thread 38 constitutes the stretchable member 73.
The rear first exterior sheet 35 as the first sheet 71 has a laminated body 76 in which two or more sheets are laminated. The sheet constituting the first sheet 71 is not limited, but for example, a nonwoven fabric can be exemplified. The first exterior sheet 35 may be composed of only the laminated body 76, or may include another sheet. The laminate 76 may be formed by stacking sheets of the same or separate bodies, and may have three or more layers. The first sheet 71 may be provided with a joining portion 75 for joining the sheets constituting the stacked body 76. The joint portion 75 may be provided over the entire region of the first sheet 71 in the thickness direction T, or may be provided in a part of the first sheet 71 in the thickness direction T, as long as it does not reach the second sheet 72. Specifically, a welded portion in which sheets constituting the first sheet 71 are welded to each other by heat or ultrasonic welding, an embossed portion in which the sheets are compressed in the thickness direction, and an adhesive portion in which the sheets are joined to each other with an adhesive can be exemplified. A plurality of the engaging portions 75 are provided at intervals in a plan view. That is, the joint portions 75 are arranged with a gap in at least one of the front-rear direction L and the width direction.
The rear elastic string 38 as the stretchable member is configured to be stretchable in the width direction W as the first direction. The rear side elastic thread 38 is joined to the rear first exterior sheet 35 and the rear second exterior sheet 36 between the rear first exterior sheet 35 (first sheet 71) and the rear second exterior sheet 36 (second sheet 72) in a state of being extended in the width direction. The means for fixing the rear elastic thread 38 is not limited, and an adhesive can be exemplified. The stretchable member 73 may be formed of an elastic yarn or may be in the form of a sheet like the outer stretchable sheet 28. The rear side elastic thread 38 of the embodiment is formed of a plurality of elastic threads, and is disposed at intervals in a second direction D2 (front-rear direction L) orthogonal to the first direction D1. The second outer sheet 36 as the second sheet 72 covers the stretchable member 73. The first sheet 71 is disposed on one side of the stretchable member 73 in the thickness direction T, and the second sheet 72 is disposed on the other side. The sheet constituting the second sheet 72 is not limited, and for example, a nonwoven fabric can be exemplified. The second sheet 72 is not formed with the joint portion 75 formed in the first sheet 71, but is joined to the first sheet 71 and/or the stretchable member 73 by a joining means different from the joint portion 75.
The deformation of the composite sheet 70 configured as described above when it is shrunk will be described. Fig. 6 is a view for explaining a deformed state of the composite sheet 70, and a cross section taken along a line D-D of fig. 4 is taken as a reference. Fig. 6(a) is an extended state, and fig. 6(b) shows a contracted state after contraction of the stretchable member. The composite sheet 70 contracts the first sheet 71 and the second sheet 72 in the first direction D1 by contraction of the stretchable member 73. By contraction of the stretchable member 73, the region between the joint portions 75 in the first sheet 71 is deformed so as to bulge in the thickness direction T, and a wrinkle formed by the first sheet 71 can be formed between the adjacent joint portions 75. In addition, the second sheet 72 is also contracted by contraction of the stretchable member, and a wrinkle is formed in the second sheet 72. Therefore, the composite sheet 70 has wrinkles formed on the surface thereof, and the cushioning property is improved. Further, since the joint portion of the first sheet 71 is not formed in the second sheet, the wrinkle formed in the first sheet 71 and the wrinkle formed in the second sheet are formed at different positions and in different forms. The cushioning properties are further improved as compared with a structure in which the gathers formed in the first sheet 71 are integrated with the gathers formed in the second sheet.
The composite sheet 70 may have an abutment region 77 where the first sheet 71 abuts the second sheet 72. The contact region 77 is a region where no other member is disposed between the first sheet 71 and the second sheet 72 in a region not overlapping with the stretchable member 73. The abutment region 77 is shown in fig. 5. Since no sheet or the like other than the stretchable member 73 is disposed between the first sheet 71 and the second sheet 72, the contractive force generated by the stretchable member 73 is more easily transmitted than in the case where a member other than the stretchable member is disposed, and the cushioning properties of the composite sheet 70 can be further improved.
A fold FL76 formed by folding the sheets constituting the laminated body 76 may be provided at the end edge of the laminated body 76. By forming the stacked body 76 from the folded sheets, the number of components can be reduced as compared with the stacked body 76 in which separate sheets are stacked. Further, at the end edge of the laminated body 76 where the fold FL76 is provided, the position of the laminated sheets does not shift. The positional displacement of the sheets constituting the stacked body 76 is suppressed, and the accuracy of the absorbent article 10 can be improved. In addition, air between the sheets constituting the stacked body 76 is difficult to leak. Gaps are easily formed between the sheets, the cushioning property of the laminate 76 is improved, and the cushioning property of the composite sheet 70 can be further improved.
The method of joining the sheets constituting the laminate 76 to each other is not limited, and welding by heat or ultrasonic waves, embossing, and an adhesive can be exemplified. The sheets constituting the laminate may be bonded to each other and the first sheet 71 and the second sheet 72 may be bonded to each other by an adhesive. In this embodiment, the weight per unit area of the adhesive joining the laminate may be lower than the weight per unit area of the adhesive joining the first sheet 71 and the second sheet 72. Since the weight per unit area of the adhesive provided between the first sheet 71 and the second sheet 72 is high, the joining strength of the stretchable member 73 to the first sheet 71 and the second sheet 72 is high, and the contraction of the stretchable member 73 is easily transmitted to the first sheet 71 and the second sheet 72. Further, since the weight per unit area of the adhesive of the laminate 76 is low, the sheets constituting the laminate 76 are easily deformed flexibly, and wrinkles are easily formed in the laminate 76. Therefore, the cushioning properties of the laminate 76 are improved, and the cushioning properties of the composite sheet 70 obtained by the manufacturing method can be improved.
As shown in fig. 5, the stretchable member 73 may be provided in plurality at intervals in a second direction D2 orthogonal to the first direction D1 as a stretching direction, and the engaging portion 75 may be provided in plurality at intervals in the second direction D2. In this aspect, the pitch D275 of the engaging portions 75 in the second direction D2 may be shorter than the pitch D273 of the stretchable members 73 in the second direction D2. Since the plurality of joints 75 are arranged at intervals in the second direction D2, wrinkles extending in the second direction D2 can be formed. In addition, since the pitch of the joint portion 75 is short, finer wrinkles can be formed.
(4) Structure of absorbent article having composite sheet
Next, the structure of the absorbent article 10 having the composite sheet 70 will be described. The composite sheet 70 has cushioning properties, and is particularly preferably disposed in an area intended to improve the tactile sensation of the skin. In the present embodiment, the composite sheet 70 is disposed in the front waist belt 20 and the rear waist belt 30. By providing the waist belt 15 having the composite sheet 70 with high cushioning properties, the feel of the skin around the waist can be improved. As a modification, a composite sheet may be disposed on leg flaps (leg flaps) disposed along leg circumferences of a wearer. According to the modification, the feeling of the wearer's leg circumference can be improved.
The first sheet 71 of the composite sheet may be positioned closer to the skin surface side T1 than the second sheet 72. The cushioning property on the side in contact with the skin can be improved, and the skin feel of the wearer can be improved. More preferably, the first sheet 71 of the composite sheet 70 may be provided on the surface of the absorbent article 10 that is positioned on the side closest to the skin, i.e., the surface that is in direct contact with the wearer. With this configuration, the feel of the skin of the wearer can be improved. In the present embodiment, the front cover sheet 27 constituting the first sheet 71 in the front waist belt 20 is provided on a surface that directly contacts the wearer.
The first sheet 71 and the second sheet 72 may be made of a nonwoven fabric or woven fabric having fibers, and the weight per unit area of the fibers of the first sheet 71 may be higher than the weight per unit area of the fibers of the second sheet 72. Since the first sheet 71 has a high basis weight, the wrinkles formed in the first sheet 71 are less likely to be crushed, and the wrinkles are easily maintained. Therefore, the cushioning property of the first sheet 71 is further improved, and the tactile sensation of the skin can be improved. In the modification, the weight per unit area of the fibers of the first sheet 71 may be lower than the weight per unit area of the fibers of the second sheet 72. Since the first sheet has a relatively low basis weight, the first sheet is easily deformed and wrinkles are easily formed in the first sheet. Therefore, the cushioning property of the first sheet 71 is further improved, and the tactile sensation of the skin can be improved.
A first fold FL71 formed by folding the sheet may be provided along the width direction at the outer end edge of the first sheet 71 in the front-rear direction L. The first fold FL71 may be disposed further outward in the front-rear direction than the front-rear direction outer end edge of the absorbent main body. Specifically, the rear first exterior sheet 35 is provided with a fold FL76 formed by folding the sheets constituting the laminated body. Fold FL76 constitutes first fold FL 71. The first fold FL71 is located at the rear end edge 71R of the first sheet 71 and extends in the width direction W. The first fold FL71 is located on the rear side of the rear end edge 40R of the absorbent main body 40, apart from the rear end edge 40R of the absorbent main body 40. The region in the vicinity of the first fold FL71 in the first sheet 71 easily forms a gap between the sheets folded via the first fold FL71, and the thickness of the first sheet 71 easily becomes thick. The region on the outer side in the front-rear direction than the outer end edge of the absorbent main body 40 is likely to have a difference in thickness compared to the region where the absorbent main body is disposed, but the difference in thickness can be made up for by the thickness of the region near the first fold of the first sheet 71. Therefore, the difference in thickness of the waist band is reduced, and the skin feel can be improved.
A second fold FL72 formed by folding the second sheet 72 may be provided along the width direction at the outer edge of the second sheet 72 in the front-rear direction. The second fold FL72 may be disposed further outward in the front-rear direction than the outer end edge in the front-rear direction L of the absorbent main body 40. The positions further to the outside in the front-rear direction than the outer end edges in the front-rear direction L of the absorbent main body 40 refer to the region between the rear end edge 40R of the absorbent main body 40 and the rear end edge 10R of the absorbent article and the region between the front end edge 40F of the absorbent main body 40 and the front end edge 10F of the absorbent article.
In the present embodiment, the rear second exterior sheet 36 is folded in the front-rear direction at the fold FL 36. The folded portion constitutes the rear third exterior sheet 39. The fold FL36 of the rear second exterior sheet 36 constitutes a second fold FL 72. The second fold line FL72 is located at the rear end edge of the second sheet 72 and extends in the width direction W. The second fold line FL72 is located at a position separated from the rear end edge 40R of the absorbent main body 40 and on the rear side of the rear end edge 40R of the absorbent main body 40. The rear end edge 72R of the second sheet 72 may constitute the rear end edge of the composite sheet 70 and be positioned at the rear end edge of the rear waist belt 30. The region outside the outer end edge of the absorbent body 40 in the front-rear direction L is likely to have a difference in thickness compared to the region where the absorbent body 40 is disposed, but the difference in thickness can be further compensated for by the thickness of the region near the second fold of the second sheet 72.
Preferably, the first fold of the first sheet 71 may be disposed between the second sheets 72 folded via the second fold FL 72. Specifically, the first fold FL71 is disposed between the rear second outer sheet 36 and the rear third outer sheet 39. Since the first fold of the first sheet 71 is arranged between the second sheets 72 folded via the second fold FL72, the bulge in the vicinity of the second fold FL72 can be provided so as to overlap with the bulge of the sheet in the vicinity of the first fold FL 71. The difference in thickness of the waist band is further reduced, and the skin feel can be improved.
(5) Method for manufacturing composite sheet
Next, a method for manufacturing the composite sheet configured as described above will be described with reference to fig. 7. The composite sheet manufacturing method S100 may include a first sheet forming step S11, a second sheet conveying step S21, an adhesive applying step S31, and an elastic member arranging step S41. In the first sheet forming step S11, the first sheet continuous body C71 is formed using the laminated continuous body C76 in which sheets continuous in the conveyance direction MD are laminated. The laminated continuous body C76 is formed by laminating two or more sheets and is continuous in the conveyance direction MD.
In the first sheet forming step S11, the plurality of joint portions 75 are formed in the laminated continuous body C76 at intervals in a plan view. The joining sections 75 may be disposed at intervals in a plan view, and may be disposed at intervals in the conveying direction MD, may be disposed at intervals in the orthogonal direction CD orthogonal to the conveying direction MD, or may be disposed at intervals in the conveying direction MD and the orthogonal direction CD.
In the second sheet conveying step S21, the second continuous sheet C72 that is continuous in the conveying direction MD is conveyed. In the adhesive applying step S31, an adhesive for bonding the stretchable member 73 provided between the first continuous sheet C71 and the second continuous sheet C72 is applied to at least one of the first continuous sheet C71, the second continuous sheet C72, and the stretchable member. The order of the first sheet forming step S11, the second sheet conveying step S21, and the adhesive applying step S31 is not limited as long as the adhesive applying step S31 is performed after the first sheet forming step S11.
After the first sheet forming step S11, the second sheet conveying step S21, and the adhesive applying step S31, the stretchable member arranging step S41 is performed to bond the stretchable member 73 in an extended state between the first continuous sheet C71 and the second continuous sheet C72 via the adhesive. The stretching direction of the stretchable member 73 is not limited, but may be preferably along the conveying direction MD. Since the stretching direction of the stretchable member 73 is along the conveyance direction MD of the first continuous sheet C71 and the second continuous sheet C72, the manufacturing process and equipment can be simplified.
According to the method for producing the composite sheet, the stretchable member in an extended state is bonded between the first continuous sheet C71 and the second continuous sheet C72, and the first continuous sheet C71 and the second continuous sheet C72 are contracted by contraction of the stretchable member. By contraction of the stretchable member, the region between the joined portions of the first sheet is deformed so as to swell in the thickness direction, and a wrinkle formed by the first sheet can be formed between the adjacent joined portions. In addition, a wrinkle is formed in the second sheet by contraction of the stretchable member. Therefore, the composite sheet obtained by the production method has wrinkles formed on the surface thereof, and the cushioning property is improved. Further, since the first continuous sheet C71 on which the joint portions 75 are formed is bonded to the stretchable member 73, the stretchability of the stretchable member is not hindered by the step of forming the joint portions 75. Therefore, the limitation of the arrangement of the joint portion and the stretchable member is reduced, and the degree of freedom of the arrangement of the joint portion and the stretchable member can be improved. Wrinkles can be formed in a desired shape at a desired position, and a composite sheet having a desired cushioning property can be obtained.
In the first sheet forming step S11, the joint portions 75 may be formed at intervals in the conveyance direction MD, and the stretchable member 73 stretched in the conveyance direction MD may be bonded in the stretchable member arranging step S41. By providing the joint portions 75 of the first continuous sheet C71 at intervals in the conveyance direction MD, wrinkles due to the presence or absence of the joint portions 75 can be alternately formed in the conveyance direction MD. In addition, since the stretchable member 73 is contracted in the conveying direction MD, the wrinkles of the first continuous sheet C71 can be formed more finely.
In a modification, in the first sheet forming step S11, the joint portions 75 extending in the orthogonal direction CD may be formed in regions across the plurality of stretchable members 73 arranged at intervals in the orthogonal direction CD orthogonal to the conveying direction MD. Fig. 8 is a plan view of a composite sheet 70X manufactured by a manufacturing method according to a modification. The joint portion 75X of the modification is provided so as to span the stretchable members arranged at intervals in the orthogonal direction. Therefore, wrinkles extending in the orthogonal direction can be formed by contraction of the plurality of stretchable members, and the accuracy of wrinkles can be improved and the shape of wrinkles can be easily maintained.
The joining means of the joined portion 75 in the first sheet forming step S11 is not particularly limited. In one embodiment, the joint portion may be formed by ultrasonic welding or embossing. The ultrasonic welding and the embossing can convey the laminated continuous body C76 at high speed to form the joint 75. Further, the degree of freedom of the arrangement of the joint portion 75 is high, and the degree of freedom of design and the accuracy of the position of the wrinkle can be improved.
As another mode, in the first sheet forming step S11, the adhesive may be applied by coater application to form the bonded portion. The coater coating is a contact coating, and the adhesive can be arranged on a surface as compared with a non-contact coating method. The rigidity of the area coated with the adhesive by the coater application may become high due to the adhesive. By increasing the rigidity of the first sheet, the first sheet is prevented from being wrinkled, and a desired wrinkle is easily formed.
In the adhesive applying step S31, an adhesive may be applied to the stretchable member 73. Compared to the form in which the adhesive is applied to the first continuous sheet C71 and the second continuous sheet C72, the adhesive is less likely to ooze out to the outer surface of the composite sheet 70, and adhesion of the adhesive to the conveyance path of the composite sheet 70 can be suppressed. Further, the adhesive is less likely to bleed out to the surface of the composite sheet 70 obtained by the manufacturing method, and the skin feel of the absorbent article 10 having the composite sheet 70 can be improved.
In the stretchable member arranging step S41, the first continuous sheet C71 may be brought into contact with the second continuous sheet C72 in a region not overlapping with the stretchable member 73 in the thickness direction T. That is, no sheet other than the stretchable members 73 is disposed between the first continuous sheet C71 and the second continuous sheet C72. The contraction force generated by the stretchable member 73 is more easily transmitted than in the form in which members other than the stretchable member are disposed, and the cushioning properties of the composite sheet 70 can be further improved.
The method for manufacturing the composite sheet may include the laminate forming step S51 before the first sheet forming step S11. In the laminate forming step S51, the continuous sheet in the conveyance direction MD is folded with a fold line along the conveyance direction MD as a base point, and a laminate continuous body C76 is formed. By folding the sheets to form the laminated continuous body C76, the number of components can be reduced compared to a structure in which separate sheets are laminated to form a laminated continuous body, and the number of man-hours for managing the components can be reduced. Further, one end of the laminated continuous body formed by folding the sheets in the orthogonal direction is a fold line, and positional displacement in the orthogonal direction of the laminated sheets does not occur at the one end. Therefore, as compared with a structure in which separate sheets are stacked to form a stacked continuous body, positional displacement in the orthogonal direction of the stacked sheets can be suppressed. In addition, air between sheets constituting the laminated continuous body is less likely to leak out, a gap is likely to be formed between the sheets, and the cushioning property of the laminated continuous body is improved, so that the cushioning property of the composite sheet obtained by the manufacturing method can be further improved.
In the laminate forming step S51, the folded sheets may be separated from each other to form the laminate continuous body C76. Specifically, the laminated continuous body C76 may be formed without providing an adhesive between the folded sheets. Gaps are easily formed between the sheets constituting the laminated continuous body C76, the cushioning property of the laminated continuous body C76 is improved, and the cushioning property of the composite sheet obtained by the production method can be further improved. Further, the region where the folded sheets can be separated from each other may be a part of the laminated continuous body. However, in order to improve the cushioning property over the entire surface of the laminated continuous body, it is preferable that no adhesive be provided over the entire surface of the laminated continuous body. The material cost of the adhesive can be reduced, and the process of applying the adhesive is not required, thereby simplifying the manufacturing process.
In the modification, in the laminate forming step S51, the sheets folded with the adhesive interposed therebetween may be joined to each other. In a modification, the sheets constituting the laminated continuous body may be joined to each other via an adhesive having a lower weight per unit area than that of the adhesive provided between the first continuous body C71 and the second continuous body C72. Gaps are easily formed between the sheets constituting the laminated continuous body C76, the cushioning property of the laminated continuous body C76 is improved, and the cushioning property of the composite sheet obtained by the production method can be further improved. In addition, the material cost of the adhesive can be reduced, and the manufacturing process can be simplified.
In the stretchable member disposing step S41, the linear or belt-shaped stretchable members 73 may be disposed at intervals in the cross direction CD. The degree of freedom in the arrangement of the stretchable member 73 can be improved without hindering the stretchability of the stretchable member 73 in the step of forming the joint portion 75. By increasing the degree of freedom in the arrangement of the stretchable member, wrinkles can be formed in a desired shape at a desired position, and a composite sheet having a desired cushioning property can be obtained.
(6) Method for manufacturing absorbent article
Next, a method for manufacturing the absorbent article 10 provided with the composite sheet 70 will be described. In addition, the steps of the conventional method for manufacturing an absorbent article can be used for steps other than the steps described below. The method for manufacturing an absorbent article includes a belt forming step of forming a waist belt using the composite sheet 70 obtained by the method for manufacturing the composite sheet 70. By providing the waist belt with the composite sheet having high cushioning properties, the skin feel at the waist can be improved.
In the belt forming step of the rear waist belt 30 of the present embodiment, in the composite sheet obtained by the composite sheet manufacturing method, the second sheet 72 is folded back with the second fold FL72 as a base point to form the rear third outer sheet 39, and the rear cover sheet 37 is disposed with the absorbent body 40 interposed therebetween. In the belt forming step, the waist belt 15 may be formed by disposing the first sheet continuous body C71 side of the composite sheet on the skin surface side of the absorbent article. The cushioning property on the side in contact with the skin can be improved, and the skin feel of the wearer can be improved. More preferably, the waist belt 15 may be formed such that the first sheet 71 of the composite sheet 70 is positioned on the surface of the absorbent article positioned on the skin side. With this configuration, the feel of the skin of the wearer can be improved.
In the modification, the waist belt 15 may be formed by disposing the second sheet continuous body C72 side of the composite sheet 70 on the skin surface side of the absorbent article in the belt forming step. The tactile sensation of the skin when the absorbent article 10 is touched from the outside can be improved, and the feeling of reassurance when the wearer touches from the outside can be improved. In the modification, the waist belt 15 may be formed so that the first sheet 71 of the composite sheet 70 is positioned on the surface of the absorbent article positioned on the non-skin side. With such a configuration, the skin feel when the absorbent article is in contact from the outside can be further improved.
The method for manufacturing an absorbent article may include an absorbent body forming step and a belt joining step. In the absorbent body forming step, an absorbent core having an absorbent material, a skin-side sheet disposed on the skin-side surface of the absorbent core, and a non-skin-side sheet disposed on the non-skin-side surface of the absorbent core are laminated to form an absorbent body. In the belt joining step, the absorbent body obtained in the absorbent body forming step is joined to the waist belt obtained in the belt forming step. By manufacturing the waist belt 15 and the absorbent main body 40 separately, the production can be performed stably with the desired specifications. By providing the waist belt 15 with the composite sheet 70 having high cushioning properties, an absorbent article having excellent skin feel can be obtained.
While the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.
In addition, the entire contents of japanese patent application No. 2018-248071, applied on 12/28/2018, are incorporated by reference into the present specification.
Industrial applicability
A composite sheet and an absorbent article having high cushioning properties can be obtained by increasing the degree of freedom in the arrangement of the joint portions and the stretchable members in the composite sheet.
Description of the reference numerals
10: absorbent article, 20: front waist belt, 22: front side elastic thread, 25: front first exterior sheet (first sheet), 26: front second exterior sheet (second sheet), 27: front cover sheet (first sheet), 28: outer stretchable sheet (stretchable member), 30: rear waist band, 35: rear first exterior sheet (first sheet), 36: rear second exterior sheet (second sheet), 37: rear cover sheet, 38: rear side elastic yarn (elastic member), 39: rear third exterior sheet, 40: absorbent body, 40R: rear end edge, 41: liquid-impermeable sheet, 42A: skin sheet, 42B: body sheet, 50: absorbent core, 60: side joint, 70: composite sheet, 71: first sheet, 71R: rear end edge, 72: second sheet, 72R: rear end edge, 73: stretchable member, 75: joint, 77: abutment region, C71: first sheet continuous body, C72: second continuous sheet, C76: laminated continuous body, D1: first direction, D2: second direction, FL 71: first fold, FL 72: second fold, S1: front waistline region, S2: rear waist region, S3: crotch region, S100: method for producing composite sheet, S11: first sheet forming step, S21: second sheet conveying step, S31: adhesive applying step, S41: stretchable member disposing step, L: front-rear direction, T: thickness direction, T1: skin surface side, T2: non-skin surface side, W: the width direction.

Claims (26)

1. A method for manufacturing a composite sheet, characterized in that,
the method for manufacturing the composite sheet comprises the following steps:
a first sheet forming step of forming a first continuous sheet using a laminated continuous body in which sheets continuous in a conveying direction are laminated;
a second sheet conveying step of conveying a second continuous sheet that is continuous in the conveying direction;
an adhesive applying step of applying an adhesive for bonding a stretchable member provided between the first continuous sheet and the second continuous sheet to at least one of the first continuous sheet, the second continuous sheet, and the stretchable member; and
a stretchable member disposing step of bonding the stretchable member in an extended state between the first continuous sheet and the second continuous sheet via the adhesive,
in the first sheet forming step, a plurality of joint portions are formed on the continuous laminated body at intervals in a plan view.
2. The method of manufacturing a composite sheet according to claim 1,
in the first sheet forming step, the joining portions are formed at intervals in the conveying direction,
in the stretchable member disposing step, the stretchable member stretched in the conveying direction is bonded.
3. The method of manufacturing a composite sheet according to claim 1,
in the first sheet forming step, a joint portion extending in the orthogonal direction is formed in a region spanning a plurality of stretchable members arranged at intervals in the orthogonal direction orthogonal to the conveying direction.
4. The method of manufacturing a composite sheet according to any one of claims 1 to 3,
in the first sheet forming step, the joint portion is formed by ultrasonic welding or embossing.
5. The method of manufacturing a composite sheet according to any one of claims 1 to 3,
in the first sheet forming step, an adhesive is applied by coater application to form the joint.
6. The method of manufacturing a composite sheet according to any one of claims 1 to 5,
in the adhesive applying step, the adhesive is applied to the stretchable member.
7. The method of manufacturing a composite sheet according to any one of claims 1 to 6,
in the stretchable member disposing step, the first continuous sheet is brought into contact with the second continuous sheet in a region not overlapping with the stretchable member in the thickness direction.
8. The method of manufacturing a composite sheet according to any one of claims 1 to 7,
the method for manufacturing the composite sheet includes a laminate forming step of forming a laminated continuous body by folding a sheet continuous in the conveying direction with a fold line along the conveying direction as a base point,
the first sheet forming step is performed after the laminate forming step.
9. The method of manufacturing a composite sheet according to claim 8,
in the laminate forming step, the folded sheets are separable from each other to form the continuous laminate.
10. The method of manufacturing a composite sheet according to claim 8,
in the laminate forming step, the sheets constituting the laminated continuous body are joined to each other via an adhesive having a lower weight per unit area than an adhesive provided between the first continuous body and the second continuous body.
11. The method of manufacturing a composite sheet according to any one of claims 1 to 10,
in the stretchable member arranging step, the stretchable members are arranged in a linear or strip shape at intervals in a direction orthogonal to the conveying direction.
12. A method for manufacturing an absorbent article having a front waistline region, a crotch region, and a rear waistline region,
the method for manufacturing an absorbent article includes a belt forming step of forming a waist belt disposed in at least one of the front waistline region and the back waistline region using the composite sheet obtained by the method for manufacturing a composite sheet according to any one of claims 1 to 11.
13. The method of manufacturing an absorbent article according to claim 12,
in the belt forming step, the first continuous sheet side of the composite sheet is disposed on the skin surface side of the absorbent article to form the waist belt.
14. The method of manufacturing an absorbent article according to claim 12,
in the belt forming step, the second continuous sheet body side of the composite sheet is disposed on the skin surface side of the absorbent article to form the waist belt.
15. The method for manufacturing an absorbent article according to any one of claims 12 to 14,
the method for manufacturing the absorbent article comprises the following steps:
an absorbent body forming step of forming an absorbent body by laminating an absorbent core having an absorbent material, a skin-side sheet disposed on a skin surface side of the absorbent core, and a non-skin-side sheet disposed on a non-skin surface side of the absorbent core; and
a belt joining step of joining the absorbent main body obtained in the absorbent main body forming step and the waist belt obtained in the belt forming step.
16. A composite sheet, said composite sheet having:
a first sheet having a laminate formed by laminating two or more sheets;
a second sheet disposed to overlap with the first sheet; and
a stretchable member joined to the first sheet and the second sheet between the first sheet and the second sheet and stretchable in a first direction,
it is characterized in that the preparation method is characterized in that,
a joining portion that joins the sheets constituting the laminate is provided in the first sheet so as not to reach the second sheet,
the plurality of joining portions are provided at intervals in a plan view.
17. The composite sheet of claim 16,
the stretchable member is provided in plurality at intervals in a second direction orthogonal to the first direction,
the joint is disposed across the plurality of stretchable members.
18. The composite sheet of claim 16 or 17,
the composite sheet has an abutment region against which the first sheet abuts the second sheet.
19. The composite sheet of any one of claims 16 to 18,
the end edge of the laminate is provided with a fold line formed by folding the sheets constituting the laminate.
20. The composite sheet of any one of claims 16 to 19,
the sheets constituting the laminate are bonded to each other via an adhesive,
the stretchable member is joined between the first sheet and the second sheet via an adhesive,
the weight per unit area of the adhesive bonding the laminate is lower than the weight per unit area of the adhesive bonding the first sheet and the second sheet.
21. The composite sheet of any one of claims 16 to 20,
the stretchable member is provided in plurality at intervals in a second direction orthogonal to the first direction,
the engaging portion is provided in plurality at intervals in the second direction,
the pitch of the engaging portions in the second direction is shorter than the pitch of the stretchable member in the second direction.
22. An absorbent article having:
a front-rear direction and a width direction orthogonal to the front-rear direction;
a front waistline region;
a rear waist region;
a crotch region disposed between the front waistline region and the rear waistline region;
an absorbent main body disposed so as to straddle the crotch region, the front waistline region, and the rear waistline region; and
a waist belt overlapping the absorbent main body in a thickness direction in at least one of the front waistline region and the back waistline region,
it is characterized in that the preparation method is characterized in that,
the waist belt having the composite sheet of any one of claims 16 to 21.
23. The absorbent article of claim 22,
the first sheet of the composite sheet is positioned closer to the skin surface side than the second sheet.
24. The absorbent article according to claim 22 or 23,
the first sheet and the second sheet are made of a nonwoven fabric or a woven fabric having fibers,
the fibers of the first sheet have a higher weight per unit area than the fibers of the second sheet.
25. The absorbent article according to any one of claims 22 to 24,
a first fold line formed by folding the sheets constituting the laminated body is provided along the width direction at an outer edge in the front-rear direction of the first sheet,
the first fold is disposed outside the front-rear direction with respect to the front-rear direction outer end edge of the absorbent main body.
26. The absorbent article of claim 25,
a second fold formed by folding the second sheet is provided along the width direction at an outer end edge in the front-rear direction of the second sheet,
the second fold is disposed further outward in the front-rear direction than the front-rear direction outer edge of the absorbent main body,
the first fold of the first sheet is disposed between the second sheets folded via the second fold.
CN201980086231.XA 2018-12-28 2019-12-24 Method for manufacturing composite sheet, method for manufacturing absorbent article, composite sheet, and absorbent article Pending CN113260342A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2018-248071 2018-12-28
JP2018248071A JP7145756B2 (en) 2018-12-28 2018-12-28 absorbent article
PCT/JP2019/050561 WO2020138057A1 (en) 2018-12-28 2019-12-24 Method for producing composite sheet, method for producing absorbent article, composite sheet, and absorbent article

Publications (1)

Publication Number Publication Date
CN113260342A true CN113260342A (en) 2021-08-13

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CN (1) CN113260342A (en)
WO (1) WO2020138057A1 (en)

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CN107106358A (en) * 2014-08-20 2017-08-29 王子控股株式会社 Disposable diaper and buffering sheet material
WO2018097772A1 (en) * 2016-11-23 2018-05-31 Essity Hygiene And Health Aktiebolag Array of gender-specific absorbent articles
WO2018116733A1 (en) * 2016-12-22 2018-06-28 花王株式会社 Disposable diaper
JP2018114131A (en) * 2017-01-19 2018-07-26 王子ホールディングス株式会社 Disposable diaper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015198915A (en) * 2014-03-31 2015-11-12 大王製紙株式会社 Method for manufacturing telescopic structure of absorbent article, method for manufacturing underpants-type disposable diaper, and underpants-type disposable diaper
CN107106358A (en) * 2014-08-20 2017-08-29 王子控股株式会社 Disposable diaper and buffering sheet material
WO2018097772A1 (en) * 2016-11-23 2018-05-31 Essity Hygiene And Health Aktiebolag Array of gender-specific absorbent articles
WO2018116733A1 (en) * 2016-12-22 2018-06-28 花王株式会社 Disposable diaper
JP2018114131A (en) * 2017-01-19 2018-07-26 王子ホールディングス株式会社 Disposable diaper

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