WO2020246398A1 - Feuille étirable et article absorbant pourvu de ladite feuille - Google Patents

Feuille étirable et article absorbant pourvu de ladite feuille Download PDF

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Publication number
WO2020246398A1
WO2020246398A1 PCT/JP2020/021471 JP2020021471W WO2020246398A1 WO 2020246398 A1 WO2020246398 A1 WO 2020246398A1 JP 2020021471 W JP2020021471 W JP 2020021471W WO 2020246398 A1 WO2020246398 A1 WO 2020246398A1
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WO
WIPO (PCT)
Prior art keywords
sheet
elastic
elastic member
fused
less
Prior art date
Application number
PCT/JP2020/021471
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English (en)
Japanese (ja)
Inventor
政宏 南岡
織恵 辻村
淳 岩崎
賢治 安藤
弘行 横松
Original Assignee
花王株式会社
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Publication date
Priority claimed from JP2020087553A external-priority patent/JP2020199248A/ja
Application filed by 花王株式会社 filed Critical 花王株式会社
Publication of WO2020246398A1 publication Critical patent/WO2020246398A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/04—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a layer being specifically extensible by reason of its structure or arrangement, e.g. by reason of the chemical nature of the fibres or filaments
    • 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
    • B32B5/14—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 a layer differing constitutionally or physically in different parts, e.g. denser near its faces
    • 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
    • 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
    • B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs

Definitions

  • the present invention relates to an elastic sheet.
  • the present invention also relates to an absorbent article provided with the elastic sheet.
  • an elastic sheet in which an elastic member such as rubber thread is joined between two sheets in an extended state is known.
  • the elastic elastic members are fixed by intermittently welding the inner sheet and the outer sheet in a state where a plurality of elastic elastic members arranged in parallel are sandwiched between the inner sheet and the outer sheet.
  • the sheet is listed.
  • the elastic elastic member is arranged in a cross-sectional space closed by a welded portion between the inner sheet and the outer sheet in the vicinity of both side portions in the radial direction thereof, and forms the outer surface of the elastic elastic member and the closed space. It is fixed by the frictional force with the seat.
  • the present invention includes a first sheet made of a fiber sheet, a second sheet arranged facing the first sheet and made of a fiber sheet, and an elastic member arranged between both sheets in an extended state and extending in one direction.
  • the present invention relates to an elastic sheet having elasticity and having elasticity along the extending direction of the elastic member.
  • the first sheet and the second sheet are joined by a plurality of fused portions located on both sides of the elastic member with the elastic member interposed therebetween and formed at intervals along the extending direction of the elastic member. It is preferable to have.
  • the elastic member is formed on the surface of the elastic member, the first sheet, and the space defined by the fused portion, the first sheet, and the second sheet located on both sides of the elastic member.
  • the sheets are fixed between the two sheets only by friction with the second sheet.
  • the first sheet is more than the length in which the second sheet is in contact with the elastic member. It is preferable that the length in contact with the elastic member is longer.
  • the second sheet is configured over the entire area between the fused portions in the thickness direction. It is preferable that the thick film region has a thick film region in which the fiber morphology is completely lost due to melt solidification of the fibers, and the thick film region has a shape that conforms to the shape of the elastic member.
  • the present invention also relates to an absorbent article composed of an absorbent body and an exterior body located on the non-skin facing surface side of the absorbent body.
  • the exterior body preferably contains the stretchable sheet.
  • FIG. 1 is a partially cutaway plan view showing an embodiment of the elastic sheet of the present invention.
  • FIG. 2 is an enlarged plan view showing a main part of the elastic sheet shown in FIG.
  • FIG. 3 is a cross-sectional view taken along the Y direction showing an enlarged main part of the elastic sheet shown in FIG.
  • FIG. 4 is a graph showing the relationship between stress and elongation rate of the elastic sheet of the present invention and the prior art.
  • FIG. 5 is a microscope image of an example of the thick film region according to the present invention.
  • FIG. 6 is a perspective view showing a state in which the elastic sheet shown in FIG. 1 is relaxed.
  • FIG. 7 is a schematic view showing an apparatus suitably used for producing the elastic sheet of the present invention.
  • FIG. 8 is an enlarged view of a main part of the apparatus shown in FIG. 7.
  • FIG. 9 is an enlarged view of the first contact portion shown in FIG.
  • the present invention relates to an elastic sheet capable of eliminating the above-mentioned drawbacks of the prior art, and to provide an absorbent article provided with the elastic sheet.
  • FIG. 1 shows an embodiment of the elastic sheet of the present invention.
  • the figure is a partially broken plan view when the elastic sheet 10 is stretched to the maximum stretched state.
  • the maximum stretched state is a first sheet constituting the stretchable sheet 10 until each elastic member, which will be described later, is stretched to reach a design dimension (dimensions when the elastic member is unfolded in a plane state without any influence of the elastic member). It is a state in which the 11 and the second sheet 12 are stretched.
  • the first fused portions 15a and 15b which will be described later, are omitted.
  • the elastic sheet 10 has a first sheet 11 and a second sheet 12 which is arranged to face the first sheet.
  • a plurality of linear elastic members 13 such as rubber threads are arranged between the two sheets 11 and 12.
  • the plurality of elastic members 13 extend in one direction without intersecting each other.
  • FIG. 1 shows a state in which the elastic members 13 extend in parallel with each other.
  • Each elastic member 13 is fixed between the two sheets 11 and 12 in an extended state.
  • the extending direction of the elastic member 13 is also referred to as the X direction.
  • the direction orthogonal to the extending direction of the elastic member 13 is also referred to as a Y direction.
  • the first sheet 11 and the second sheet 12 is made of a fiber sheet.
  • the first sheet 11 may be a hydrophilic fiber sheet or a hydrophobic fiber sheet.
  • the second sheet 12 may be a hydrophilic fiber sheet or a hydrophobic fiber sheet.
  • the contact angle of the constituent fibers collected from any part of the fiber sheet with water is less than 90 degrees.
  • the contact angle of the fiber with water can be measured, for example, according to the method described in Japanese Patent Application Laid-Open No. 2015-142721. From the viewpoint of facilitating the formation of the fused portion described later, when one or both of the first sheet 11 and the second sheet 12 are hydrophilic fiber sheets, the synthetic fiber made of a heat-sealing resin is hydrophilic.
  • the fibers constituting the fiber sheet may be core-sheath type composite fibers whose surface is made of a heat-sealing resin only.
  • the hydrophobic fiber sheet has a contact angle of the constituent fibers collected from any part of the fiber sheet with water of 90 degrees or more. From the same viewpoint as described above, when one or both of the first sheet 11 and the second sheet 12 are hydrophobic fiber sheets, it is a sheet containing synthetic fibers made of the above-mentioned heat-sealing resin as constituent fibers. Is preferable.
  • the forming material may be the same or different between the first sheet 11 and the second sheet 12.
  • the first sheet 11 and the second sheet 12 are joined by a plurality of fused portions. Both sheets 11 and 12 are fused at the fused portion. "Fusion" means that a molten portion is formed on both sheets 11 and 12 by heat, and the molten portions are mixed and then cooled to integrally bond the portions.
  • the elastic sheet 10 of the present embodiment has a pair of first fused portions 15a and 15b located on both sides of the elastic member 13 and a pair of first fused portions in the Y direction as fusion portions. It has a plurality of second fusion portions 16a and 16b located between the attachment portions 15a and 15b.
  • the fused portions of the first fused portions 15a and 15b and the second fused portions 16a and 16b are formed at intervals along the extending direction of the elastic member 13, that is, the X direction.
  • Two second fused portions 16 are arranged side by side between a pair of first fused portions 15a and 15b in the Y direction.
  • the fused portions 15a, 15b, 16a, 16b are separated from each other, and are arranged in this order in a row along the Y direction.
  • the elastic member 13 is located between the first fused portions 15a and 15b located on both sides of the elastic member 13 with the elastic member 13 sandwiched therein, by friction only with the first sheet 11 and the second sheet 12, both sheets 11, It is fixed between twelve. Between the first fused portions 15a and 15b, a space defined by the first fused portions 15a and 15b, the first sheet 11, and the second sheet 12 is formed in a cross section along the Y direction. In this space, the elastic member 13 is fixed between the two sheets 11 and 12 only by friction between the surface of the elastic member 13 and the first sheet 11 and the second sheet 12. That is, in the elastic sheet 10, the elastic member 13 is not fixed to the first sheet 11 and the second sheet 12 by a joining means such as an adhesive or fusion.
  • the elastic member 13 and the first sheet 11, and the elastic member 13 and the second sheet 12 are not fused to each other.
  • the elastic sheet 10 is formed while maintaining the good texture and breathability inherent in the first sheet 11 and the second sheet 12. Further, the elastic sheet 10 is highly elastic.
  • the elastic member 13 is both formed by friction between the surface of the elastic member 13 and the first sheet 11 and the second sheet 12 in the space along the Y direction between the pair of first fused portions 15a and 15b. It is fixed to the sheets 11 and 12. More specifically, as shown in FIG. 2, which is an enlarged view of a main part of FIG. 1, the side edge 151a on the elastic member 13 side of one first fused portion 15a and the elastic member 13 of the other first fused portion 15b.
  • the first fused portion interval D which is the interval between the side edge 151b on the side, is made narrower than the diameter d1 of the elastic member 13 in the maximum extended state of the elastic sheet 10, and the pair of first fused portions 15a
  • the elastic member 13 is fixed between the first and second sheets 11 and 12 only by the friction generated on the surface of the elastic member 13 in the space by the pinching pressure of, 15b.
  • FIG. 2 it seems that the elastic member 13 is joined to the pair of first fused portions 15a and 15b, but in reality, the elastic member 13 is not joined to the pair of first fused portions 15a and 15b. It has become.
  • the first The 1-fused portion interval D preferably has a value of d2 / D of 1.1 or more when the diameter of the elastic member 13 in the relaxed state of the elastic sheet 10 is d2 (see FIG. 2). It is more preferably 2 or more, and even more preferably 1.3 or more. The higher the value of d2 / D, the higher the frictional force between the surface of the elastic member 13 and the first sheet 11 and the second sheet 12, which is preferable.
  • the diameter d2 of the elastic member 13 in the relaxed state of the elastic sheet 10 is the diameter of the elastic member 13 at the portion where the elastic member 13 is not pinched in the relaxed state of the elastic sheet 10.
  • the fineness is preferably 155 dtex or more, and more preferably 310 dtex or more, from the viewpoint of ensuring the elasticity of the elastic sheet 10. Further, it is preferably 1240 dtex or less, and more preferably 940 dtex or less.
  • the fineness of the elastic member 13 is preferably 155 dtex or more and 1240 dtex or less, and more preferably 310 dtex or more and 940 dtex or less.
  • the second The length of the first sheet 11 in contact with the elastic member 13 is longer than the length of the sheet 12 in contact with the elastic member 13.
  • the portion on the first sheet 11 side is Z outer in the thickness direction of the elastic sheet 10 as compared with the portion on the second sheet 12 side of the elastic member 13.
  • the elastic member 13 When the elastic member 13 is bisected in the thickness direction Z in the same cross-sectional view, the elastic member 13 has an asymmetrical shape between the second sheet 12 side and the first sheet 11 side. (See Fig. 3). In other words, in the same cross-sectional view, the elastic member 13 has a substantially flat portion on the second sheet 12 side between the pair of fused portions 15a and 15b, and rises outward in the thickness direction on the first sheet 11 side. Has a part. Further, on the second sheet 12 side of the elastic member 13, the portion between the first fused portions 15a and 15b in the cross-sectional view along the Y direction is a portion other than the portion between the first fused portions 15a and 15b in the same cross-sectional view. It is a relatively flat part.
  • the thick film region in which the second sheet 12 completely lost the fiber morphology in the entire area between the fused portions 15a and 15b due to the melt-solidification of the constituent fibers in the entire thickness direction Z. Has 20.
  • the resins constituting the constituent fibers of the second sheet 12 are agglomerated to form a thick film.
  • all the constituent fibers are melt-solidified, and the fiber morphology is completely lost. Therefore, when the thick film region 20 is observed under a microscope, no fibers are observed in the thick film region 20.
  • some pores may exist in the thick film region 20, the thick film region 20 is generally composed of a medium substance.
  • the elastic sheet has a thick film region 20 only in the second sheet 12.
  • the thick film region 20 is formed on the second sheet 12 located between the pair of first fused portions 15a and 15b in the Y direction, and faces the first sheet 11 with the elastic member 13 interposed therebetween.
  • the region that overlaps the elastic member 13 in the thickness direction Z and faces the thick film region 20 with the elastic member 13 interposed therebetween is a fiber in which the fiber morphology of at least a part of the constituent fibers is maintained.
  • the shape region 21 is formed.
  • the fibrous region 21 is composed of the constituent fibers of the first sheet 11.
  • the fibrous region 21 may be in a state in which the constituent fibers of the first sheet 11 maintain the fiber morphology in the entire area thereof.
  • the fibrous region 21 has a portion where the constituent fibers of the first sheet 11 are in a state of being melted and solidified by losing the fiber morphology, and a portion where the constituent fibers of the constituent fibers are in a state of being maintained. You may be doing it.
  • the first sheet 11 has a fibrous region 21.
  • the surface of the second sheet 12 facing the elastic member 13 is in close contact with the substantially flat portion of the elastic member 13.
  • the surface of the second sheet 12 facing the elastic member 13 is along the substantially flat portion of the elastic member 13. Therefore, in the elastic sheet of the present embodiment, the surface on the second sheet side is substantially flat between the pair of first fused portions 15a and 15b, while the surface on the first sheet side is outward in the thickness direction Z. It is raised to the side. That is, in the present embodiment, the thick film region 20 has a shape that follows the shape of the elastic member 13. Specifically, the thick film region 20 is in close contact with the surface of the elastic member 13 facing the thick film region 20, and has a shape that follows the shape of the surface.
  • the thickness of the thick film region 20 is constant. “Constant thickness” means that the difference between the maximum thickness and the minimum thickness of the thick film region 20 is 5 ⁇ m or less. From the viewpoint of further improving the stretchability of the stretchable sheet 10, which will be described later, the maximum thickness of the thick film region 20 is preferably 1 ⁇ m or more and 15 ⁇ m or less, and more preferably 3 ⁇ m or more and 13 ⁇ m or less.
  • the maximum thickness of the thick film region 20 is measured by the following method. After freezing the elastic sheet using liquid nitrogen or the like, a portion of the elastic sheet to which the elastic member is fixed by a pair of first fusion portions is cut out from the central portion in the extension direction of the elastic member. At this time, the elastic member is cut along a direction orthogonal to the extension direction, and this is used as a sample. As described above, the elastic member is fixed only by friction between the first sheet and the second sheet, and the elastic member and the first sheet and the second sheet are not fused to each other. Therefore, when the sample is cut out, The elastic member may come off from the sample. If the elastic member remains in the sample, the elastic member is removed from the sample.
  • the cross section of the sample is magnified and observed using a scanning electron microscope (for example, JSM-IT100 manufactured by JEOL Ltd.).
  • the magnification at the time of observation is set to 100 to 200 times so that the second sheet can be observed in the thickness direction of the sample and both ends between the pair of first fused portions can be observed in the extension direction of the elastic member.
  • the thick film region is observed as a region in which the fiber morphology is lost between the pair of first fused portions of the second sheet.
  • the maximum thickness of the thick film region is measured using the image data of the cross section of the sample.
  • the cut surface of the sample is observed in a state like, for example, the microscope image shown in FIG. FIG. 5 is a microscope image when the formation positions of the fused portions 15a and 15b are observed from the thick film region side.
  • the cavity in FIG. 5 is a portion where elastic members are arranged.
  • the thick film region is a film-like portion continuous with the first fused portion, and the fiber morphology of the sheet is lost.
  • the elastic sheet 10 having the above configuration has better elastic characteristics than the elastic sheet described in Patent Document 1.
  • the reason for this is as follows.
  • the elastic sheet 10 has a thick film region 20 and a fibrous region 21 facing the thick film region 20 at the formation positions of the fused portions 15a and 15b.
  • the thick film region 20 has high rigidity because it is a region of a medium substance generated by melting and solidifying the fibers constituting the second sheet 12.
  • the high rigidity of the thick film region 20 in combination with the fact that the thick film region 20 is not fused with the elastic member 13 means that the thick film region 20 is difficult to be deformed.
  • the diameter of the elastic member 13 gradually decreases due to the stretching, but the thick film region 20 does not follow the change and maintains its original shape. ..
  • the contact area between the elastic member 13 and the thick film region 20 gradually decreases. Due to this, the frictional force of the elastic member 13 due to the thick film region 20 is gradually reduced, and the elastic characteristics inherent in the elastic member 13 become apparent.
  • the stress when the elastic sheet 10 is stretched approaches the stretch stress inherent in the elastic member 13.
  • the region corresponding to the thick film region 20 is composed of fibers.
  • the region is a region that can be easily deformed (hereinafter, the region is referred to as an “easily deformable region”). Therefore, when the elastic sheet is stretched, it becomes an elastic member that becomes thinner. The easily deformable region is deformed accordingly. That is, even if the diameter of the elastic member changes, the adhesion between the elastic member and the easily deformable region does not change significantly.
  • the stretchable sheet described in Patent Document 1 does not cause a large change in the frictional force between the elastic member and the easily deformable region even if it is stretched. As a result, in the stretchable sheet described in Patent Document 1, the stretchable property inherently possessed by the elastic member is impaired due to the frictional force with the easily deformable region.
  • the stretchable sheet of the present invention has an advantage that it can be stretched with a lower stress than the stretchable sheet described in Patent Document 1, as shown in FIG. Have.
  • FIG. 4 there is no essential difference between the stretchable sheet of the present invention and the stretchable sheet described in Patent Document 1 in the characteristics when the stretched sheet is contracted from the stretched state. Therefore, the stretchable sheet of the present invention has a smaller difference in stretchable characteristics between the stretchable sheet and the stretchable sheet than the stretchable sheet of Patent Document 1.
  • the stretchable sheet of the present invention has a small hysteresis of the stress-elongation rate curve during elongation and contraction.
  • the stress-elongation rate curve of the stretchable sheet is obtained by the following method. First, a sheet piece having a length of 600 mm and a width of 50 mm is cut out from the elastic sheet along the elastic member. The cut out sheet piece is rolled into a ring shape having an inner diameter of 550 mm, and both ends overlapping each other are fixed at two places at predetermined intervals in the width direction using a stapler to prepare a ring-shaped test piece. The stapler core is fixed so as to be long in the longitudinal direction of the sheet piece.
  • the ring-shaped test piece can be doubled using a tensile tester (for example, Shimadzu Corporation's tensile tester "Autograph AG-X") under the conditions of a distance between chucks of 100 mm and a speed of 300 mm / min.
  • the stress-elongation rate curve is obtained by stretching and then contracting at a speed of 300 mm / min.
  • the value of is preferably 0.83 or more, more preferably 0.84 or more.
  • the elastic sheet When the elastic sheet is used for the outer body of an absorbent article such as a diaper, A is a measure of the ease of spreading the absorbent article and B is a measure of the fit of the absorbent article.
  • the B / A value is preferably 0. It is .90 or less, more preferably 0.88 or less.
  • the second sheet 12 is the elastic member 13.
  • the length of the first sheet 11 in contact with the elastic member 13 is longer than the length of contact with the elastic member 13, and the thick film region 20 follows the shape of the elastic member 13. Therefore, when the elastic sheet 10 is used as the exterior body, for example, and the elastic sheet is arranged so that the second sheet 12 faces the wearer's skin, the thick film region 20 formed on the second sheet 12 Therefore, the degree to which the elastic member 13 presses the wearer's skin can be reduced. That is, there is an advantage that a feeling of strangeness is less likely to occur when the absorbent article is worn.
  • the elastic sheet 10 can be suitably used for an exterior body that forms an outer surface of an absorbent article. As described above, since the elastic sheet 10 has good elastic characteristics, the absorbent article provided with the elastic sheet 10 can easily expand the elastic sheet 10 with a small force. That is, it is easy to perform the wearing operation, and the fit to the wearer's body is improved.
  • the first and second sheets 11 and 12 project so as to be separated from each other along the thickness direction as shown in FIG. 6 with the second fused portion 16 as the starting point of bending. That is, in the elastic sheet 10, convex portions 17 are formed on the first sheet 11 and the second sheet 12 so as to protrude from each other along the thickness direction Z, respectively.
  • the convex portion 17 is a portion of the elastic sheet 10 that forms folds, which will be described later, and is a portion that follows the shape of the elastic member 13 at a position where the first sheet 11 and the second sheet 12 overlap the elastic member 13. Is a different part.
  • the convex portion 17 continuously extends along the Y direction.
  • a plurality of folds are formed on each surface of the elastic sheet 10 by the convex portion 17.
  • the stretchable sheet 10 in the state shown in FIG. 6 exhibits a flexible texture and an excellent appearance due to the folds.
  • the distance between two elastic members 13 adjacent to each other along the Y direction is Le (see FIG. 1)
  • the distance is in the Y direction with respect to the distance Le.
  • the value of L16 / Le which is the ratio of the length L16 (see FIG. 1) of the second fused portion 16 along the line, is preferably 0.25 or more, more preferably 0.50 or more, and 0.70. The above is more preferable. The closer the value of L16 / Le is to 1, the more preferable it is from the viewpoint of ensuring the joint strength.
  • the distance Le between two elastic members 13 adjacent to each other along the Y direction is preferably 1 mm or more.
  • the Le value is preferably 10 mm or less, more preferably 8 mm or less, and even more preferably 6 mm or less.
  • the value of Le is preferably 1 mm or more and 10 mm or less, more preferably 1 mm or more and 8 mm or less, and further preferably 1 mm or more and 6 mm or less.
  • the value of Lf is preferably 6 mm or less, and preferably 5 mm or less. More preferably, it is 3 mm or less.
  • the lower limit of Lf is not particularly limited, and the smaller the value, the better the expansion and contraction characteristics of the elastic sheet 10, which is preferable.
  • the value of Lf is preferably 1 mm or more and 6 mm or less, and more preferably 1 mm or more and 5 mm or less.
  • the lengths in the X direction which are the widths of the first fused portion 15 and the second fused portion 16, are preferably 3 mm or less and 2 mm or less independently of each other. It is preferably 1 mm or less, and more preferably 1 mm or less.
  • the lower limit of the width is not particularly limited, and the smaller the value, the more preferable. However, if the width is as narrow as about 0.2 mm, the effect of the present invention is sufficiently exhibited. Therefore, the width is preferably 0.2 mm or more and 3 mm or less, more preferably 0.2 mm or more and 2 mm or less, and further preferably 0.2 mm or more and 1 mm or less.
  • the material constituting the elastic sheet 10 will be described in detail.
  • the first and second sheets 11 and 12 for example, air-through non-woven fabric, heat roll non-woven fabric, spunlace non-woven fabric, spunbond non-woven fabric, non-woven fabric produced by various manufacturing methods such as melt blown non-woven fabric, and two or more of these are laminated and integrated.
  • a laminated fabric or the like can be used.
  • the fiber sheets used as both sheets or one sheet are air-through non-woven fabric, heat roll non-woven fabric, spunlace non-woven fabric, spunbond non-woven fabric, melt blown non-woven fabric and the like. Is preferable.
  • a laminated non-woven fabric in which a spunbonded non-woven fabric layer and a melt-blown non-woven fabric layer are laminated as the second sheet, because the thick film region 20 can be easily formed.
  • the laminated non-woven fabric of the spunbonded non-woven fabric layer (S) and the melt-blown non-woven fabric layer (M) include SM non-woven fabric and SMS non-woven fabric.
  • a non-woven fabric is preferably used as the first and second sheets 11 and 12.
  • the basis weight of the non-woven fabric is preferably 5 g / m 2 or more and 50 g / m 2 or less, and particularly preferably 8 g / m 2 or more and 30 g / m 2 or less.
  • the buckling strength of the non-woven fabric having such a basis weight is preferably 50 cN or less in the direction orthogonal to the machine flow direction (CD), particularly preferably 30 cN or less, and preferably 70 cN or less in the machine flow direction (MD), particularly preferably 50 cN or less. Is. By using a soft sheet, the formability of the folds can be enhanced. Buckling strength is measured by the following method.
  • Buckling strength test method Take a rectangular test piece 150 mm in the machine flow direction (MD) and 30 mm in the direction orthogonal to the machine flow direction (CD). Five test pieces are cut out from the sheet to be measured. Using this test piece, a cylinder having a diameter of 45 mm is made, and the upper end and the lower end of the overlapping portion are fastened with a stapler or the like, and this is used as a measurement sample. With respect to this measurement sample, the maximum strength when compressed to 20 mm is measured under the measurement conditions of a compression speed of 10 mm / min and a measurement distance of 20 mm in the compression test mode of the Tencilon universal test device. The measurement environment is 20 ° C. and 65% RH.
  • the average value of the maximum intensity of each measurement sample is obtained, and this is used as the buckling intensity in the orthogonal direction (CD).
  • the buckling strength in the machine flow direction (MD) is the same as above, except that a rectangular test piece of 150 mm in the direction orthogonal to the machine flow direction (CD) and 30 mm in the machine flow direction (MD) is taken. Be measured.
  • the first and second sheets 11 and 12 are not limited to two separate sheets, but one sheet is bent to form two opposing surfaces, and a portion constituting one surface is 1 The portion constituting one sheet and the other surface may be used as another sheet.
  • the one sheet is preferably a hydrophilic fiber sheet.
  • the material for forming the elastic member 13 various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation.
  • the material include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, elastic polyolefin, polyurethane, and the like, and the morphology includes a rectangular, square, circular, and polygonal cross section.
  • thread-like or string-like (flat rubber, etc.), multifilament type thread-like, or the like can be used.
  • the figure shows an apparatus preferably used for manufacturing the elastic sheet 10.
  • the device 100 shown in the figure includes an ultrasonic fusion unit 30.
  • the ultrasonic fusion unit 30 includes a horn 31 that vibrates ultrasonic waves and a receiving roll 32 that is arranged at a position facing the tip surface of the horn 31.
  • the horn 31 is made of a metal such as an aluminum alloy or a titanium alloy, and is designed to resonate in the frequency band used.
  • the horn 31 is connected to a booster (not shown), and the ultrasonic vibration transmitted from the booster to the horn 31 is amplified or attenuated inside the horn 31 and applied to the welding object.
  • the receiving roll 32 is designed so that the temperature of the receiving roll 32 can be adjusted, whereby the first sheet 11 and the second sheet 12 in contact with the receiving roll 32 can be heated. That is, the first sheet 11 and the second sheet 12 can be heated by being wound around the receiving roll 32.
  • the receiving roll 32 can adjust the temperature of the receiving roll 32 by, for example, providing a heater for heating the receiving roll 32 and a temperature sensor for measuring the temperature of the receiving roll 32 inside the rotating shaft side. it can.
  • a horn 31, which will be described later, is pressed against the second sheet 12, and ultrasonic vibration is directly applied to the second sheet 12.
  • FIG. 8 shows an enlarged main part of the ultrasonic fusion section 30 in FIG. 7.
  • the ultrasonic fusion portion 30 includes a receiving roll 32 in which contact portions 40 and 41 forming convex portions are formed on the peripheral surface, and a horn 31 capable of contacting the convex portions.
  • the Y direction shown in FIG. 8 is the width direction (axial direction) of the receiving roll 32, and this direction coincides with the Y direction in the stretchable sheet 10 to be manufactured.
  • a pair of convex portions are arranged along the axial direction on the peripheral surface of the receiving roll 32 in the ultrasonic fusion portion 30.
  • a concave portion 42 is formed between the pair of convex portions.
  • the pair of convex portions are collectively referred to as a first contact portion 40.
  • the receiving roll 32 is provided with a first contact portion 40 intermittently along the rotation direction R (see FIG. 7) of the roll. Further, a plurality of second contact portions 41 are intermittently provided on the peripheral surface of the receiving roll 32 along the rotation direction R of the receiving roll 32.
  • the first contact portion 40 and the second contact portion 41 form a convex portion protruding toward the horn 31 on the peripheral surface of the receiving roll. That is, the first contact portion 40 and the second contact portion 41 are located on the side closer to the horn 31.
  • the first contact portions 40 are located on the same line in the rotation direction R
  • the second contact portions 41 are located on the same line in the rotation direction R.
  • the first contact portion 40 and the two second contact portions 41 are alternately arranged side by side in the width direction thereof.
  • the surface having the portions that abut the first contact portion 40 and the second contact portion 41 is a flat surface without unevenness.
  • the first contact portion 40 is provided with a recess 42 in a substantially central portion in the Y direction, that is, in the roll width direction.
  • the recess 42 has a rectangular shape in a cross-sectional view along the width direction of the receiving roll 32.
  • the recess 42 has a volume for accommodating at least a part of the elastic member 13 in the extended state. In other words, the recess 42 has a volume such that the elastic member 13 can partially protrude from the upper surface of the first contact portion 40 in a state where the elastic member 13 is housed in the recess 42.
  • the opening width of the recess 42 along the Y direction roughly corresponds to the first fused portion spacing D (see FIG. 2) in the target elastic sheet 10.
  • the first sheet 11, the second sheet 12, and a plurality of elastic members 13 arranged in an extended state between the sheets 11 and 12 are used.
  • the first sheet 11 unwound from the original fabric 11a of the first sheet 11 is conveyed while being wound around the peripheral surface of the receiving roll 32.
  • a plurality of elastic members 13 each unwound from the winding body 13a are arranged on the surface of the first sheet 11 in an extended state. ..
  • the elastic member 13 is conveyed in a state of being partially housed in the recess 42 of the first contact portion 40 provided on the peripheral surface of the receiving roll 32. At this point, the first sheet 11 is previously housed in the recess 42 (see FIG. 8).
  • the degree of extension of the elastic member 13 is larger than the degree of extension of the elastic member 13 in the maximum extended state of the elastic sheet 10, and the diameter of the elastic member 13 is large. It is smaller than the opening width of the recess 42 along the Y direction.
  • the second sheet 12 unwound from the original fabric 12a of the second sheet 12 is supplied to the peripheral surface of the receiving roll 32.
  • a laminated body in which the stretched elastic member 13 is arranged between the first sheet 11 and the second sheet 12 is prepared. That is, the laminated body is supplied so that the elastic member 13 in the laminated body passes through the concave portion 42 in a state where the convex portions 40, 41 of the receiving roll 32 and the joint portion of the sheet member face each other.
  • the first sheet 11 and the second sheet 12 are preheated by being wound around the receiving roll 32 as described above. Ultrasonic vibration is applied to the laminated body by the horn 31 (see FIGS.
  • the laminated body is pressurized by the horn 31 to form a substantially flat portion on the second sheet 12 side of the elastic member 13, and the second sheet 12 is in close contact with the elastic member 13 to form the substantially flat portion. It will be in a state along the flattened part.
  • the ultrasonic fusion section 30 fuses the first sheet 11 and the second sheet 12 in the laminated body at positions on both sides of the elastic member 13 and at a plurality of positions spaced apart along the Y direction. Let me. As a result, the pair of first fused portions 15a and 15b described above and the second fused portion 16 are formed. As shown in FIG. 8, on the peripheral surface of the receiving roll 32, the first contact portion 40 and the second contact portion 41 are more prominent than the other portions and are located closer to the horn 31. , The first sheet 11 and the second sheet 12 located on the first contact portion 40 and the second contact portion 41 are fused, and the first fusion portion 15 and the second fusion portion 16 for joining these sheets are fused. Is formed.
  • the elastic member 13 is partially housed in the recess 42, and the elastic member 13 is not fused to either the first sheet 11 or the second sheet 12, and the non-bonded state is maintained.
  • the ultrasonic fusion portion 30 By the fusion by the ultrasonic fusion portion 30, a thick film region 20 is formed between the pair of first fusion portions 15a and 15b of the second sheet 12, and the pair of first fusion portions of the first sheet 11 A fibrous region 21 is formed between 15a and 15b.
  • the elastic member 13 having an increased diameter has a first fused portion interval D or more, which is an interval between the two first fused portions 15a and 15b, and is preferably a first fused portion interval. Exceeds D.
  • the elastic member 13 is sandwiched by the two first fused portions 15a and 15b, and is fixed only by the friction between the first sheet 11 and the second sheet 12. Further, due to the fusion, the portion where the constituent fibers between the pair of first fusion portions 15a and 15b of the second sheet 12 are melted is solidified by the decrease in temperature.
  • the shape of the elastic member 13 having an increased diameter on the second sheet 12 side and the shape of the second sheet 12 are maintained substantially flat between the pair of first fused portions 15a and 15b.
  • the degree of extension of the elastic member 13 and the opening width of the recess 42 along the Y direction at the time of manufacturing the elastic sheet 10 may be appropriately set according to the desired extension state of the elastic sheet 10.
  • the degree of elongation of the elastic member 13 is such that the elastic sheet 10 has the desired extensibility. Elongation rate) and is selected to have the desired folds.
  • the degree of extension of the elastic member 13 can be adjusted by appropriately adjusting the depth and width of the recesses 42 (first fused portion interval D) and the like. From the viewpoint of easily forming the thick film region 20, when the laminated body is supplied to the ultrasonic fusion unit 30 which is a fusion device in the present manufacturing method, the first sheet 11, the elastic member 13 and the elastic member 13 in the laminated body are supplied.
  • the size of the recess 42 is preferably within the following range.
  • the width c of the recess 42 is preferably 1.
  • the diameter a of the elastic member 13 in the extended state (see FIG. 9), assuming that the elastic member 13 fits in the recess 42 together with the first sheet 11. It is more than 0 times and 2.0 times or less.
  • the diameter a (see FIG. 10) of the elastic member 13 in the extended state is preferably 1.3 times or more and 2.0 times or less, more preferably 1.4 times or more 1 of the depth b of the recess 42 (see FIG. 9). It is 9.9 times or less, more preferably 1.5 times or more and 1.8 times or less.
  • the linear pressure of the horn 31, that is, the pressure applied to the laminate by pressing the horn 31 against the laminate is preferably 4 N / mm or more, more preferably 4. It is 2N / mm or more, preferably 5N / mm or less, more preferably 4.8N / mm or less, preferably 4N / mm or more and 5N / mm or less, more preferably 4.2N / mm or more and 4.8N. / Mm or less.
  • the preheating temperature of the second sheet 12 is preferably lower than the melting point of the constituent fibers of the second sheet 12.
  • the preheating temperature of the second sheet 12 is preferably 90 ° C. to 135 ° C. lower than the melting point of the constituent fibers of the second sheet 12, and more preferably 95 ° C. to 130 ° C. lower. It is more preferably 100 ° C. to 125 ° C. lower.
  • the preheating temperature of the second sheet 12 is 40 ° C. (with respect to the melting point-). It is preferably in the range of 123 ° C.) to 60 ° C. (melting point ⁇ 103 ° C.). From the viewpoint of more easily preheating the second sheet 12, the temperature of the receiving roll 32 is preferably set in a range of 90 ° C. to 135 ° C. lower than the melting point of the constituent fibers of the second sheet 12.
  • the melting point of the constituent fibers of the second sheet 12 means the melting point of the resin having the lowest melting point among the constituent resins of the constituent fibers in the second sheet 12.
  • the melting point of the constituent fibers can be measured by thermal analysis using a differential scanning calorimeter (for example, DSC6200 manufactured by Seiko Instruments, Inc.). Specifically, a thermal analysis of a fiber sample (1 mg) finely cut from any 10 points on the web or non-woven fabric is performed at a heating rate of 10 ° C./min, and the melting peak temperature of the fiber constituents to be measured is determined by the constituent fibers. Let it be the melting point of. When there are a plurality of melting peak temperatures, the lowest melting peak temperature among them is defined as the melting point of the constituent fibers.
  • Ultrasonic vibration is preferably used in the method for manufacturing the elastic sheet 10.
  • a heat seal is used for fusing the first sheet 11 and the second sheet 12
  • the elastic member 13 and the second sheet 12 are fused, and between the first sheet 11 and the second sheet 12 of the elastic member 13.
  • the fixing in may not be realized only by the friction of both sheets 11 and 12.
  • the heat seal is used, the elastic member 13 is deformed by melting, so that it is difficult to form the thick film region 20 along the shape of the elastic member 13.
  • the diameter of the elastic member 13 in the extended state is a and the depth of the recess 42 is b
  • the magnitude relationship between a and b is a> b.
  • the second sheet 12 and the elastic member 13 are fused between the fused portions 15a and 15b. Further, in the manufacturing method using the heat seal, if the magnitude relationship between a and b is b ⁇ a, the pair of first fused portions 15a and 15b are cross-sectionally viewed along the Y direction. The second sheet between the fused portions 15a and 15b has a linear shape along the Y direction and does not follow the elastic member 13.
  • the elastic sheet 10 can be used as a constituent material of an absorbent article such as a disposable diaper and a sanitary napkin, and is particularly preferably used for forming an elastic portion of the absorbent article.
  • Absorbent articles are mainly used for absorbing and retaining body fluids excreted from the body such as urine and menstrual blood.
  • Absorbent articles include, but are not limited to, disposable diapers, sanitary napkins, incontinence pads, panty liners, etc., and broadly include articles used for absorbing liquid discharged from the human body. To do.
  • the absorbent articles include, for example, an absorbent main body having a liquid-retaining absorbent body interposed between the front sheet, the back sheet, and both sheets, and an exterior body located on the non-skin facing surface side of the absorbent main body. Those having and are mentioned.
  • the elastic sheet of the present invention is preferably used for an exterior body.
  • the absorbent article may further include various members according to its specific use. Such members are known to those of skill in the art.
  • the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment.
  • the pair of first fused portions 15a and 15b and the second fused portion 16 are intermittently provided on the same straight line in the Y direction, but these fused portions 15a , 15b, 16 may be continuous on the same straight line in the Y direction.
  • the first fused portion 15 and the second fused portion 16 have a rectangular shape, but instead of this, a shape such as an oval shape, a circular shape, or a rhombus shape may be adopted.
  • the elastic sheet 10 has a plurality of elastic members 13, but the elastic sheet 10 may have one elastic member 13.
  • the present invention further discloses the following elastic sheet, an absorbent article provided with the same, and a method for producing the elastic sheet.
  • ⁇ 1> It has a first sheet made of a fiber sheet, a second sheet arranged opposite to the first sheet and made of a fiber sheet, and an elastic member arranged between both sheets in an extended state and extending in one direction.
  • An elastic sheet having elasticity along the extending direction of the elastic member.
  • the first sheet and the second sheet are joined by a plurality of fused portions located on both sides of the elastic member with the elastic member interposed therebetween and formed at intervals along the extending direction of the elastic member.
  • the elastic member is formed on the surface of the elastic member, the first sheet, and the space defined by the fused portion, the first sheet, and the second sheet located on both sides of the elastic member.
  • the first sheet is more than the length in which the second sheet is in contact with the elastic member.
  • the length in contact with the elastic member is longer.
  • the second sheet is configured over the entire area between the fused portions in the thickness direction.
  • the elastic sheet When the elastic sheet is cross-sectionally viewed along a direction orthogonal to the extending direction of the elastic member at the formation position of the fusion portion, the portion of the elastic member on the first sheet side is the second elastic member. Compared to the part on the sheet side, the elastic sheet is raised outward in the thickness direction.
  • ⁇ 3> In a cross-sectional view along a direction orthogonal to the extending direction of the elastic member, on the second sheet side of the elastic member, the portions between the fused portions located on both sides of the elastic member are other than between the fused portions.
  • the elastic sheet according to ⁇ 2> which is a substantially flat portion as compared with the portion.
  • ⁇ 4> The above-mentioned ⁇ 2> or ⁇ 3>, wherein the surface on the second sheet side is substantially flat between the fused portions, while the surface on the first sheet side is raised outward in the thickness direction.
  • Elastic sheet
  • the thick film region is in close contact with the surface of the elastic member facing the thick film region, and has a shape that follows the shape of the surface, according to any one of ⁇ 1> to ⁇ 4>.
  • ⁇ 6> When the elastic sheet is cross-sectionally viewed along a direction orthogonal to the extending direction of the elastic member at the formation position of the fusion portion, the surface of the second sheet facing the elastic member is in close contact with the elastic member.
  • ⁇ 7> The stretchable sheet according to any one of ⁇ 1> to ⁇ 6>, wherein the stretchable sheet has the thick film region only in the second sheet.
  • ⁇ 8> The elastic sheet according to any one of ⁇ 1> to ⁇ 7>, wherein the thick film region and the elastic member are not fused to each other.
  • ⁇ 9> When the elastic sheet is viewed in cross section along the orthogonal direction and the thick film region is viewed along the orthogonal direction, the difference between the maximum thickness and the minimum thickness in the thick film region is 5 ⁇ m or less.
  • ⁇ 10> The elastic sheet according to any one of ⁇ 1> to ⁇ 9>, wherein the maximum thickness of the thick film region is preferably 1 ⁇ m or more and 15 ⁇ m or less, more preferably 3 ⁇ m or more and 13 ⁇ m or less.
  • the distance between the side edge on the elastic member side in one fused portion and the side edge on the elastic member side in the other fused portion is defined as D.
  • the value of d2 / D is 1.1 or more, preferably 1.2 or more, more preferably 1.3 or more.
  • ⁇ 12> The elastic sheet according to any one of ⁇ 1> to ⁇ 11>, wherein the fineness of the elastic member in the relaxed state of the elastic sheet is 155 dtex or more and 1240 dtex or less, preferably 310 dtex or more and 940 dtex or less.
  • ⁇ 13> The elastic sheet according to any one of ⁇ 1> to ⁇ 12>, wherein the distance Lf between the fused portions adjacent to each other in the extending direction of the elastic member is 1 mm or more and 6 mm or less.
  • ⁇ 14> The elastic sheet according to any one of ⁇ 1> to ⁇ 12>, wherein the distance Lf between the fused portions adjacent to each other in the extending direction of the elastic member is 1 mm or more and 5 mm or less.
  • ⁇ 15> The elastic sheet according to any one of ⁇ 1> to ⁇ 14>, wherein the fused portion has a length of 0.2 mm or more and 3 mm or less along the extending direction of the elastic member.
  • ⁇ 16> The one according to any one of ⁇ 1> to ⁇ 15>, wherein the fused portion has a length of 0.2 mm or more and 2 mm or less, preferably 0.2 mm or more and 1 mm or less along the extending direction of the elastic member.
  • Elastic sheet. ⁇ 17> Another fusion portion that joins the first sheet and the second sheet is formed between the adjacent elastic members and the adjacent fusion portions in a direction orthogonal to the extending direction of the elastic member.
  • the length of the other fused portion along the extending direction of the elastic member is 0.2 mm or more and 3 mm or less, preferably 0.2 mm or more and 2 mm or less, and more preferably 0.2 mm or more and 1 mm or less.
  • the value of L16 / Le is 0.25 or more, preferably 0.50 or more.
  • the first sheet and the second sheet are formed with convex portions protruding from each other along the thickness direction with the other fused portion as the starting point of bending, and the convex portions are in the orthogonal directions.
  • the elastic sheet according to any one of ⁇ 17> to ⁇ 19>, wherein a plurality of folds are formed by the convex portions, which extend continuously along the above.
  • ⁇ 21> The elastic sheet according to ⁇ 20>, wherein the convex portion is a portion different from a portion along the shape of the elastic member at a position where the first sheet and the second sheet overlap the elastic member.
  • ⁇ 22> The elastic sheet according to any one of ⁇ 1> to ⁇ 21>, wherein the distance between adjacent elastic members is 1 mm or more and 10 mm or less.
  • ⁇ 23> The elastic sheet according to any one of ⁇ 1> to ⁇ 22>, wherein the distance Le between adjacent elastic members is 1 mm or more and 10 mm or less, preferably 1 mm or more and 8 mm or less, and more preferably 1 mm or more and 6 mm or less. ..
  • ⁇ 24> The elastic sheet according to any one of ⁇ 1> to ⁇ 23>, wherein the second sheet is a laminated non-woven fabric in which a spunbonded non-woven fabric layer and a melt-blown non-woven fabric layer are laminated.
  • Non-woven fabric is used as the first sheet and the second sheet.
  • the value of B / A is 0.83 or more and 0.90 or less.
  • the elastic sheet according to any one of. ⁇ 28> The elastic sheet according to ⁇ 27>, wherein the B / A value is 0.84 or more and 0.88 or less.
  • ⁇ 29> In the first sheet, a region that overlaps with the elastic member in the thickness direction and faces the thick film region with the elastic member in between is a fibrous region in which the fiber morphology of at least a part of the constituent fibers is maintained.
  • ⁇ 30> The elastic sheet according to ⁇ 29>, wherein the fibrous region is in a state where the constituent fibers of the first sheet maintain the fiber morphology in the entire area.
  • the fibrous region has a portion in which the constituent fibers of the first sheet are in a state of being melted and solidified by losing the fiber morphology, and a portion in which the constituent fibers of the constituent fibers are in a state of being maintained.
  • ⁇ 32> The stretchable sheet according to any one of ⁇ 1> to ⁇ 31>, wherein the first sheet and the second sheet are two separate sheets in the stretchable sheet.
  • the first sheet and the second sheet are formed by bending one sheet to form two opposing surfaces, and a portion constituting one surface constitutes the first sheet and the other surface.
  • An absorbent article composed of an absorbent body and an exterior body located on the non-skin facing surface side of the absorbent body.
  • ⁇ 36> The absorbent article according to ⁇ 34>, wherein the second sheet in the elastic sheet is arranged so as to face the clothing side.
  • an elastic sheet and an absorbent article having a small difference in elastic characteristics between the case of expansion and contraction and the case of contraction.

Abstract

La présente invention comprend : une première feuille (11) ; une deuxième feuille (12) ; et un élément élastique (13) disposé dans un état étendu entre les deux feuilles (11, 12) et s'étendant dans une direction. La première feuille (11) et la deuxième feuille (12) sont positionnées sur des côtés opposés, avec l'élément élastique (13) entre elles, et reliées par une pluralité de parties fusionnées (15) formées à certains intervalles, dans la direction d'extension de l'élément élastique (13). L'élément élastique (13) est fixé uniquement par frottement entre les deux feuilles (11, 12), dans un espace défini par les parties fusionnées (15), la première feuille (11) et la deuxième feuille (12). La deuxième feuille (12) comporte une zone de film épais (20) dans toute la zone située entre les parties fusionnées (15). Dans la zone de film épais (20), les fibres constitutives de la deuxième feuille (12) sont fondues et solidifiées et perdent complètement leur forme fibreuse.
PCT/JP2020/021471 2019-06-04 2020-05-29 Feuille étirable et article absorbant pourvu de ladite feuille WO2020246398A1 (fr)

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JP2019-104775 2019-06-04
JP2020087553A JP2020199248A (ja) 2019-06-04 2020-05-19 伸縮性シート、及び該伸縮性シートを備えた吸収性物品
JP2020-087553 2020-05-19

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Publication number Priority date Publication date Assignee Title
JP2004330777A (ja) * 2003-04-30 2004-11-25 Carl Freudenberg Kg 弾性複合材、その製造方法およびその使用
JP2005080859A (ja) * 2003-09-08 2005-03-31 Kao Corp 複合伸縮部材及びその製造方法
JP2008104853A (ja) * 2006-09-29 2008-05-08 Daio Paper Corp 吸収性物品における伸縮部形成方法及びその形成装置
JP2012126140A (ja) * 2006-07-07 2012-07-05 Unicharm Corp シート部材、高密度領域含有シートの製造方法およびシート部材を使用した使い捨ておむつ
JP2017148111A (ja) * 2016-02-22 2017-08-31 花王株式会社 パンツ型吸収性物品
WO2019003908A1 (fr) * 2017-06-29 2019-01-03 株式会社瑞光 Dispositif et procédé de production de stratifié étirable pour article vestimentaire

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004330777A (ja) * 2003-04-30 2004-11-25 Carl Freudenberg Kg 弾性複合材、その製造方法およびその使用
JP2005080859A (ja) * 2003-09-08 2005-03-31 Kao Corp 複合伸縮部材及びその製造方法
JP2012126140A (ja) * 2006-07-07 2012-07-05 Unicharm Corp シート部材、高密度領域含有シートの製造方法およびシート部材を使用した使い捨ておむつ
JP2008104853A (ja) * 2006-09-29 2008-05-08 Daio Paper Corp 吸収性物品における伸縮部形成方法及びその形成装置
JP2017148111A (ja) * 2016-02-22 2017-08-31 花王株式会社 パンツ型吸収性物品
WO2019003908A1 (fr) * 2017-06-29 2019-01-03 株式会社瑞光 Dispositif et procédé de production de stratifié étirable pour article vestimentaire

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