WO2020153464A1 - Stretchable composite sheet and manufacturing method therefor - Google Patents

Stretchable composite sheet and manufacturing method therefor Download PDF

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Publication number
WO2020153464A1
WO2020153464A1 PCT/JP2020/002434 JP2020002434W WO2020153464A1 WO 2020153464 A1 WO2020153464 A1 WO 2020153464A1 JP 2020002434 W JP2020002434 W JP 2020002434W WO 2020153464 A1 WO2020153464 A1 WO 2020153464A1
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WO
WIPO (PCT)
Prior art keywords
sheet
stretchable
less
composite sheet
elastic
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Application number
PCT/JP2020/002434
Other languages
French (fr)
Japanese (ja)
Inventor
小林　賢司
省吾 戸羽
和也 金子
隆広 飛田
Original Assignee
花王株式会社
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Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN202080010013.0A priority Critical patent/CN113316517B/en
Publication of WO2020153464A1 publication Critical patent/WO2020153464A1/en

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    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
    • D06C3/06—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics by rotary disc, roller, or like apparatus

Definitions

  • the present invention relates to a stretchable composite sheet having stretchability and a method for manufacturing the same.
  • a sheet material in which elastic filaments are fixed in a stretched state on a non-woven fabric is supplied between a pair of tooth groove rolls, and the sheet material is stretched, whereby a highly stretchable portion and a stretchable portion of the sheet material are provided.
  • a technique has been proposed in which a stretchable sheet is formed by forming a low portion (Patent Document 1).
  • the applicant has proposed a technique of joining such a stretchable sheet in a stretched state with a non-stretchable sheet, and then shrinking the stretchable sheet to obtain a stretchable composite sheet having a fold-shaped ridge portion on the non-stretchable sheet side. Proposed (Patent Document 2).
  • a plurality of elastic filaments arranged so as to extend in one direction without intersecting with each other are bonded to a stretchable sheet material containing a fiber material over their entire length in a substantially non-stretched state.
  • a stretchable composite sheet having a stretchable sheet that is stretchable in one direction and a non-stretchable sheet that is partially joined to one side of the stretchable sheet. In the stretched state in which the stretchable composite sheet is stretched in the one direction, the stretchable sheet has high grammage portions and low grammage portions alternately in the one direction.
  • the seal portion in which the stretchable sheet and the non-stretchable sheet are combined is intermittently formed in the one direction.
  • the stretchable composite sheet In the stretched state in which the stretchable composite sheet is stretched in the one direction, between the end portions of the seal portions adjacent in the one direction with respect to the center distance C between the high basis weight portions adjacent in the one direction.
  • the ratio (A/C) of the distance A is 0.2 or more and 20 or less.
  • the non-stretchable sheet has a ridge portion extending in the orthogonal direction orthogonal to the one direction between the seal portions adjacent to each other in the one direction. Is formed.
  • the present invention also provides a method for producing the stretchable composite sheet.
  • the method for producing a stretchable composite sheet of the present invention comprises a precursor production step of joining a plurality of elastic filaments to a sheet material so as to extend in one direction to obtain a composite material which is a precursor of the stretchable sheet.
  • the method for producing a stretchable composite sheet of the present invention has ridges and grooves extending in the axial direction alternately along the circumferential direction, and supplies the composite material between a pair of tooth groove rolls that mesh with each other, By stretching the composite material, there is a stretch development processing step of obtaining a stretchable sheet in which the sheet material is stretchable.
  • the method for producing a stretchable composite sheet of the present invention is a method in which the stretchable sheet is laminated on a non-stretchable sheet in a state of being stretched in the one direction, and the stretchable sheet and the non-stretchable sheet are provided with a plurality of sealing parts.
  • a sheet sealing step of obtaining the stretchable composite sheet by partially joining the one direction with an interval In the sheet sealing step, in the one direction, the ratio of the distance between the ends of the adjacent seal portions to the distance between the centers of the adjacent high basis weight portions is 0.2 or more and 20 or less, The stretchable sheet and the non-stretchable sheet are partially joined at the seal portion.
  • FIG. 1 is a perspective view schematically showing a stretchable composite sheet that is an embodiment of the present invention.
  • FIG. 2 is a plan view schematically showing the stretched state of the stretchable composite sheet shown in FIG.
  • FIG. 3 is a sectional view taken along the line III-III of the stretchable composite sheet shown in FIG.
  • FIG. 4 is a sectional view taken along line IV-IV of the stretchable composite sheet shown in FIG.
  • FIG. 5 is a cross-sectional view taken along the direction X in which the elastic filament extends, showing a preferred example of the elastic sheet that constitutes the elastic composite sheet of the present invention.
  • FIG. 6 is a perspective view showing a stretch sheet precursor manufacturing step in a preferable method for producing a stretch composite sheet of the present invention.
  • FIG. 7A and 7B are diagrams showing a stretch-developing treatment step and a sheet-sealing step in a preferred method for producing a stretchable composite sheet of the present invention, wherein FIG. 7A is an overall schematic diagram, and FIG. Is.
  • FIG. 8 is an enlarged cross-sectional view of the meshing portion of the tooth groove roll showing how the tooth groove extending process is performed using the tooth groove extending device shown in FIG. 7B.
  • FIG. 9 is a view corresponding to FIG. 2 of a stretchable composite sheet which is another embodiment of the present invention.
  • FIG. 10 is a figure which shows the evaluation result of the elastic composite sheet of the Example of this invention, (a) is a figure which shows the evaluation result of softness, (b) is a figure which shows the evaluation result of the slipperiness of skin.
  • FIG. 11 is a diagram showing the evaluation results of the elongation rate of the stretchable composite sheet of the example of the present invention
  • FIG. 11A is a diagram showing the evaluation results of the elongation rate of Examples 1 to 3
  • FIG. It is a figure which shows the evaluation result of the expansion rate of Examples 3-5.
  • the elastic sheet of Patent Document 1 and the elastic composite sheet of Patent Document 2 have room for improvement in terms of improving the flexibility as a sheet and the slipperiness of the skin.
  • the present invention relates to a stretchable composite sheet that can solve the above-mentioned drawbacks of the conventional technology and an efficient manufacturing method thereof.
  • 1 and 2 show a stretchable composite sheet 1 which is an embodiment of the stretchable composite sheet of the present invention.
  • 1, 3 and 4 show a state in which the stretchable composite sheet 1 is contracted in one direction X, which is the direction in which the elastic filament 21 extends, and the ridge portion 31 is formed.
  • 2 shows a state in which the stretchable composite sheet 1 is stretched in the one direction X. In the extended state shown in FIG. 2, the sheet material 20 on which the ridge portions 31 are formed is substantially flat.
  • the stretchable composite sheet 1 has a plurality of elastic filaments 21 arranged so as to extend in one direction X without intersecting each other in a substantially non-stretched state over the entire length thereof.
  • the stretchable sheet 2 that is stretchable in the one direction X and is joined to the stretchable sheet materials 20, 20 that include a fiber material, and the non-stretchable sheet that is partially joined to one side of the stretchable sheet 2.
  • the property sheet 3 is included.
  • the elastic sheet 2 that constitutes the elastic composite sheet 1 has a structure in which a plurality of elastic filaments 21 are joined to two sheet materials 20 and 20, and the plurality of elastic materials is used.
  • the filaments 21 extend in one direction X without intersecting each other, and are arranged at intervals in a direction Y orthogonal to the one direction X.
  • Each of the plurality of elastic filaments 21 is joined to the two sheet materials 20, 20 in a substantially non-stretched state over the entire length of the stretchable sheet 2 in the one direction X.
  • the two sheet materials 20 and 20 that form the stretchable sheet 2 is extensible.
  • the two sheet materials 20 and 20 include substantially inelastic fibers, and are substantially inelastic.
  • the "elasticity" of the elastic filaments and the inelastic "elasticity” of the sheet material 20 mean that the elastic filament can be stretched and is stretched by 100% with respect to the original length (to a length of 200% of the original length. When the force is released from the above, it has a property of returning to a length of 125% or less of the original length.
  • the sheet materials 20 and 20 can extend in the same direction as the extending direction X of the elastic filament 21.
  • “extendable” means that (a) the constituent fibers themselves of the sheet materials 20 and 20 are stretched and (b) the constituent fibers themselves are not stretched but are bonded at the intersections.
  • the nonwoven fabric as a whole expands due to separation between the fibers, structural change of the three-dimensional structure formed by multiple fibers due to bonding of fibers, breaking of constituent fibers, stretching of slack of fibers, etc. Including cases and.
  • Each of the sheet materials 20 and 20 may be already stretchable in the original state before being joined to the elastic filament 21. Alternatively, it is not extensible in the original state before being joined with the elastic filament 21, but is processed so as to be extensible after being joined with the elastic filament 21 so that it can be extended. Good.
  • the sheet material 20 is made to have a good transportability when the elastic filament 21 is welded to the sheet material 20. It is preferable that the material is not stretchable in the original state.
  • the plurality of elastic filaments 21 constituting the stretchable sheet 2 are substantially continuous over the entire lengths of the stretchable sheet 2 and the stretchable composite sheet 1, respectively, as shown in FIG.
  • Each elastic filament 21 contains an elastic resin.
  • Each elastic filament 21 is joined to the sheet members 20, 20 in a substantially non-stretched state.
  • the elastic filaments 21 may be thread-shaped synthetic rubber or natural rubber. Alternatively, it may be obtained by dry spinning (melt spinning) or wet spinning.
  • the elastic filaments 21 are preferably obtained by direct melt spinning without winding the filament once.
  • the elastic filament 21 is preferably obtained by drawing an undrawn yarn.
  • the elastic filament 21 is preferably formed by stretching the elastic resin in a molten or softened state. By stretching the elastic resin in a molten or softened state, it becomes easy to bond the elastic filament 21 to the sheet material 20 in a non-stretched state.
  • a resin as a raw material of the elastic filament 21 is melt-spun to obtain an undrawn yarn once, and the elastic filament of the undrawn yarn is heated again to soften (hard segment Examples include an operation of drawing in a state of a glass transition point temperature Tg) or higher, and an operation of directly drawing (b) a molten fiber obtained by melt spinning a resin that is a raw material of the elastic filament 21.
  • the elastic filaments 21 are obtained by directly drawing the molten fibers obtained by melt spinning.
  • Each elastic filament 21 is joined to the sheet materials 20 and 20 over its entire length.
  • the phrase “joined over the entire length thereof” does not require that all the fibers (the constituent fibers of the sheet material 20) that are in contact with the elastic filament 21 are joined to the elastic filament 21, and the elastic filament 21 is It means that the elastic filaments 21 and the constituent fibers of the sheet material 20 are joined in such a manner that the intentionally formed non-joined portion does not exist in the sheet 21.
  • Examples of the manner of joining the elastic filament 21 and the sheet materials 20, 20 include welding and adhesion with an adhesive. It is also preferable to weld the elastic filament 21 to the sheet material 20 before solidifying the elastic filament 21 obtained by melt spinning.
  • an adhesive can be applied as an auxiliary joining means before joining the sheet material 20 and the elastic filament 21.
  • heat treatment steam jet, heat embossing
  • mechanical entanglement needle punching, spun lace
  • the joining of the sheet material 20 and the elastic filament 21 is achieved only by solidifying the elastic filament 21 in a molten or softened state in contact with the sheet material 20, which improves the flexibility of the sheet. It is preferable from the point.
  • the elastic sheet 2 can be expanded and contracted in the same direction X as the elastic filament 21 extends.
  • the elasticity of the elastic sheet 2 is developed due to the elasticity of the elastic filament 21.
  • the stretchable sheet 2 is stretched in the same direction as the extending direction of the elastic filament 21, the elastic filament 21 and the sheet materials 20 and 20 are stretched. Then, when the stretching of the stretchable sheet 2 is released, the elastic filament 21 contracts, and the sheet material 20 returns to the state before stretching with the contraction.
  • the stretchable sheet 2 after the non-stretchable composite material 2A is manufactured by joining the non-stretchable sheet materials 20 and 20 with the elastic filaments 21 in the non-stretched state, the composite material 2A is used as a raw sheet. As shown in FIG. 7, elasticity is obtained by passing between a pair of concavo-convex surfaces that alternately have ridges and grooves and mesh with each other, specifically, between a pair of rolls 26 and 27 having tooth grooves. It is preferable to use a product that expresses.
  • FIG. 5 as a preferable example of the stretchable sheet 2 used for the stretchable composite sheet 1, as shown in FIG. 7, a non-stretchable composite material 2A is manufactured by passing it between a pair of tooth gap rolls 26, 27. A cross-sectional view of the stretchable sheet 2 along the direction X in which the elastic filament 21 extends is shown.
  • the stretchable sheet in the form shown in FIG. 5 is a form that is remarkably exhibited when the tooth space stretching device is used in the stretchability developing treatment step for obtaining the stretchable sheet 2 from the non-stretchable composite material 2A.
  • the high grammage portions 22 and the low grammage portions 23 are alternately arranged along the direction X in which the elastic filaments 21 extend.
  • the high grammage portion 22 and the low grammage portion 23 each extend in a strip shape in a direction Y orthogonal to a direction X in which the elastic filament 21 extends. It is preferable that the high grammage portions 22 and the low grammage portions 23 are alternately arranged at a constant cycle.
  • the high grammage section 22 has a larger grammage and a larger thickness than the low grammage section 23.
  • the low grammage portion 23 has a smaller grammage and a smaller thickness than the high grammage portion 22.
  • the high grammage portions 22 are substantially equal in width to each other, and the low grammage portions 23 are also preferably equal in width to each other. That each high basis weight portion 22 has substantially the same width means that the difference in width between the one having the largest width and the one having the smallest width is within 10% among the plurality of high basis weight portions 22. Means that. That each low basis weight portion 23 has substantially the same width means that the difference in width between the one having the largest width and the one having the smallest width is within 10% among the plurality of low basis weight portions 23. Means that.
  • the thickness of the high basis weight portion 22 is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0. 3 mm or more, more preferably 0.5 mm or more, preferably 2 mm or less, more preferably 1.5 mm or less, still more preferably 1.4 mm or less, even more preferably 1.2 mm or less, and also preferably Is 0.1 mm or more and 2 mm or less, more preferably 0.2 mm or more and 1.5 mm or less, still more preferably 0.3 mm or more and 1.4 mm or less, and still more preferably 0.5 mm or more and 1.2 mm or less.
  • the thickness of the low basis weight portion 23 is preferably 10% or more, more preferably 20% or more, still more preferably 30% of the thickness of the high basis weight portion 22. % Or more, more preferably 40% or more, preferably 80% or less, more preferably 70% or less, still more preferably 60% or less, still more preferably 50% or less, and preferably 10%. It is 80% or more and 80% or less, more preferably 20% or more and 70% or less, further preferably 30% or more and 60% or less, and still more preferably 40% or more and 50% or less.
  • the thickness of the high grammage portion 22 and the low grammage portion 23 here is the total (two layers) of the two sheet materials 20 and 20 in the stretched state of the stretchable sheet 2 in the stretchable composite sheet 1. The thickness of the fiber.
  • the thickness is measured by allowing the stretchable sheet 2 to stand for 2 days or more in an environment of 20 ⁇ 2° C. and 65 ⁇ 5% RH under no load for 2 days, and then obtaining the following method.
  • the stretchable sheet 2 is sandwiched between flat plates with a load of 0.5 cN/cm 2 in a state where the stretchable sheet 2 is stretched in the extending direction of the elastic filaments to a length of 2 to 3 times.
  • the cross section is observed with a microscope at a magnification of 50 to 200 times, and the thickness of the high grammage portion 22 having the maximum thickness and the low grammage portion 23 having the minimum thickness are measured.
  • Each of the high grammage portion 22 and the low grammage portion 23 is measured at three or more places, and the average value of each is set as the thickness of the high grammage portion 22 and the low grammage portion 23.
  • the state of being extended to a length of 2 to 3 times is a state in which the length of the natural state after being left for 2 days or more is extended to a length of 2 to 3 times the length. ..
  • the basis weight of the high basis weight portion 22 is preferably 20 g/m 2 or more, more preferably 25 g/m 2 or more, further preferably from the viewpoint of material strength such as breakage. 30 g/m 2 or more, more preferably 36 g/m 2 or more, preferably 90 g/m 2 or less, more preferably 80 g/m 2 or less, still more preferably 70 g/m 2 or less, still more preferably 60 g.
  • the basis weight of the low basis weight portion 23 is preferably 10 g/m 2 or more, more preferably 12 g/m 2 or more, further preferably 13 g/m 2 or more.
  • the grammage of the high grammage part 22 and the low grammage part 23 here is the total grammage of the two sheet materials 20, 20 in the stretched state of the elastic sheet 2 in the elastic composite sheet 1. ..
  • Ten small pieces are cut out from an arbitrary portion of the composite material 2A used for manufacturing the stretchable sheet 2 whose grammage of the high grammage part and the low grammage part is measured.
  • the mass of each of the 10 small pieces of the obtained composite material 2A was measured using an electronic balance, and the average value of the masses of the 10 small pieces was divided by the average value of the areas of the 10 small pieces.
  • the value is the basis weight of the composite material 2A.
  • the basis weight of the composite material 2A is set as the basis weight of the high basis weight portion 22.
  • the method of measuring the thickness as described above, elasticity and the thickness of the high basis weight portion 22 and the low basis weight portion 23 of the sheet 2 is measured, high basis weight portion low basis weight portion 23 in which the thickness was measured for L A of 22 calculating the ratio of the thickness L B (L B / L a ).
  • the calculated ratio (L B / L A) the value obtained by multiplying the basis weight of the composite 2A described above (basis weight of the high basis weight portion 22), the basis weight of the low basis weight portion 23.
  • the non-stretchable sheet 3 used in the present invention has no stretchability from the viewpoint of forming the ridge portion 31 having excellent slipperiness of the skin as the ridge portion 31.
  • the stretchability referred to here is the stretchability of the non-stretchable sheet 3 itself. It is preferable that the non-stretchable sheet 3 does not have stretchability at least in the direction X in which the elastic filaments 21 of the stretchable sheet 2 stacked on the non-stretchable sheet 3 extend. It is preferred that it has no stretchability.
  • the non-stretchable sheet 3 preferably has substantially no stretchability in either the direction X in which the elastic filament 21 extends or the direction Y orthogonal thereto, and in all directions parallel to the front and back surfaces thereof. It is preferred that it has no stretchability.
  • the fact that the sheet is not substantially stretchable in a certain direction means that the sheet hardly stretches even when a pulling force is applied to the sheet in the certain direction.
  • a material tensile tester such as Tensilon (registered trademark)
  • the breaking elongation when the sample breaks is 10% or less.
  • the sample is not stretchable in the longitudinal direction.
  • the elongation at break can be calculated by (length of the sample at break-original length of the sample)/(original length of the sample) ⁇ 100.
  • the longitudinal direction of the sample is the same as the "certain direction" described above.
  • the stretchable sheet 2 included in the stretchable composite sheet 1 has a high basis weight portion 22 and a low basis weight portion 23 alternately in one direction X, which is a direction in which the elastic filament 21 extends.
  • the seal portion 4 in which the stretchable sheet 2 and the non-stretchable sheet 3 are joined is formed intermittently in the one direction X.
  • the stretchable composite sheet 1 includes the seal portions 4 adjacent to the one direction X with respect to the center distance C (see FIG. 2) between the high basis weight portions 22 adjacent to each other in the one direction X in which the elastic filament 21 extends.
  • the ratio (A/C) of the end-to-end distance A see FIG.
  • the ratio (A/C) is 0.2 or more, in the direction X in which the elastic filament 21 extends, which is the main stretching direction of the stretchable composite sheet 1, between the adjacent seal portions 4 and 4,
  • the low-basis-weight portion 23 having high elasticity in the elastic sheet 2 is likely to be present, and the non-elastic sheet 3 is easy to form the ridge portion 31 and is excellent in slipperiness of skin and cushioning property. It becomes easy to form the ridge portion 31.
  • the ratio (A/C) is 20 or less, formation defects such as collapse of the ridge portion 31 are prevented.
  • the seal portion 4 and the high basis weight portion 22 may overlap with each other in the thickness direction of the stretchable composite sheet 1 or may be offset from each other.
  • the elastic composite sheet which excels in slipperiness of the skin, reduces friction with the skin when it is used on the surface of various products that comes into contact with human skin.
  • a smooth feeling can be obtained when moving while touching the surface on which the ridge portion 31 is formed.
  • products having a surface that comes into contact with human skin include disposable diapers, sanitary napkins, body fluid absorbent articles such as panty liners, underwear for pants, panties, underwear such as bras, sanitary masks, and supporters.
  • the stretchable composite sheet excellent in slipperiness of the skin is used for the inner surface of the pants-type disposable diaper or underwear with the surface on which the ridges 31 are formed facing the wearer's skin.
  • advantages such as smooth lifting and lowering for attachment/detachment without resistance.
  • the stretchable composite sheet is used on the outer surface of the pants-type disposable diaper or the outer surface of the underpants of the underwear with the surface on which the ridges 31 are formed facing the side opposite to the wearer's skin, When the underwear is worn, the contact area with the underwear is reduced and the ease of wearing the underwear can be expected to be improved.
  • the ratio (A/C) is more preferably 0.2 or more, and more preferably 20 or less, from the viewpoint of forming a ridge having excellent slipperiness on the skin and cushioning properties. Moreover, 1 or more and 15 or less are more preferable, and 1.5 or more and 5.0 or less are still more preferable. From the same viewpoint, the seal portions 4, 4 adjacent to each other in the one direction X with respect to the center distance D (see FIG. 2) between the low basis weight portions 23 adjacent in the one direction X, which is the direction in which the elastic filament 21 extends.
  • the ratio (A/D) of the end-to-end distance A (see FIG. 2) is preferably in the same range as the ratio (A/C).
  • the center-to-center distance C (see FIG. 2) between the high basis weight portions 22 and the end-to-end distance A (see FIG. 2) between the seal portions 4 and 4 are obtained by elastically stretching the stretchable composite sheet 1 by a tensile tester.
  • the filament 21 is stretched in one direction X, which is the extending direction, at a tensile speed of 300 mm/min, and is measured in a state where the stress is 3.0 N (hereinafter, referred to as “standard stretched state”).
  • standard stretched state the stretchable composite sheet 1 is not stretched in the direction Y orthogonal to the one direction X.
  • the center-to-center distance C (see FIG. 2) between the high grammage portions 22 is preferably 1 mm or more, more preferably 1.5 mm or more, still more preferably 1.7 mm or more, still more preferably from the viewpoint of elasticity. It is 2 mm or more, and from the viewpoint of material strength, preferably 5 mm or less, more preferably 4 mm or less, still more preferably 3.5 mm or less, still more preferably 3 mm or less. It is 5 mm or less, more preferably 1.5 mm or more and 4 mm or less, still more preferably 1.7 mm or more and 3.5 mm or less, and still more preferably 2 mm or more and 3 mm or less.
  • the seal portions 4 and 4 is preferably 1 mm or more, more preferably 1.5 mm or more, still more preferably 2 mm or more, and even more preferably from the viewpoint of elasticity. It is 3 mm or more, and preferably 20 mm or less, more preferably 15 mm or less, still more preferably 10 mm or less, still more preferably 5 mm or less, from the viewpoint of forming ridges, and preferably 1 mm from the viewpoint of compatibility thereof. 20 mm or less, more preferably 1.5 mm or more and 15 mm or less, still more preferably 2 mm or more and 10 mm or less, still more preferably 3 mm or more and 5 mm or less.
  • the length L4x (see FIG. 2) of the seal portion 4 in the one direction X is a ratio (L4x) to the center distance C (see FIG. 2) between the high basis weight portions 22 from the viewpoint of elasticity and flexibility.
  • /C) is preferably 0.02 or more, more preferably 0.03 or more, still more preferably 0.05 or more, still more preferably 0.1 or more, and further preferably 2 or less, more preferably 1 0.5 or less, more preferably 1 or less, still more preferably 0.5 or less, preferably 2 or less 0.02 or more, more preferably 1.5 or less 0.03 or more, still more preferably 1 or less 0.05.
  • the above is more preferably 0.5 or less and 0.1 or more. From the same viewpoint, the length L4x (see FIG.
  • the seal portion 4 is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0.3 mm or more, still more preferably 0.5 mm. Or more, preferably 3 mm or less, more preferably 2 mm or less, still more preferably 1 mm or less, and preferably 0.1 mm or more and 3 mm or less, more preferably 0.2 mm or more and 2 mm or less, further preferably 0.3 mm. It is 2 mm or less and more preferably 0.5 mm or more and 1 mm or less.
  • the seal portion 4 formed intermittently in the one direction X in which the elastic filament 21 extends also in the orthogonal direction Y orthogonal to the one direction X. It is preferable that the stretchable composite sheet 1 is formed intermittently from the viewpoint of further improving the stretchability and flexibility of the stretchable composite sheet 1 as a sheet.
  • An end-to-end distance B (see FIG. 2) between the adjacent seal portions 4 in the orthogonal direction Y has a ratio (B/C) to the center-to-center distance C (see FIG. 2) between the high grammage portions 22.
  • the distance B between the ends is preferably 1 mm or more, more preferably 2 mm or more, still more preferably 3 mm or more, from the viewpoint of stretching stress, and preferably from the viewpoint of forming a convex fold.
  • the distance B between the ends is preferably 0.5 times or more and 30 times or less, more preferably 1 time or more and 10 times or less, with respect to the length L4y of the seal portion 4 along the orthogonal direction Y.
  • the length L4y of the seal portion 4 is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0.3 mm or more, still more preferably 0.5 mm, and more preferably 5 mm or less. It is preferably 3 mm or less, more preferably 2 mm or less, still more preferably 1.5 mm, and preferably 0.1 mm or more and 5 mm or less, more preferably 0.2 mm or more and 3 mm or less, still more preferably 0.3 mm or more and 2 mm or less. , And more preferably 0.5 mm or more and 1.5 mm or less.
  • the distance B between the end portions of the seal portions 4 and 4 (see FIG. 2) and the length L4x and the length L4y of the seal portion are also measured in the
  • the ratio of the distance B between the end portions of the seal portions 4 and 4 to the center distance E (see FIG. 2) between the adjacent elastic filaments 21 in the orthogonal direction Y orthogonal to the direction X in which the elastic filament 21 extends (B /E) is preferably 0.1 or more, more preferably 0.2 or more, still more preferably 0.3 or more, preferably 100 or less, more preferably 80 or less, from the viewpoint of stretchability and air permeability. It is more preferably 50 or less, and from both viewpoints, it is preferably 0.1 or more and 100 or less, more preferably 0.2 or more and 80 or less, still more preferably 0.3 or more and 50 or less.
  • the center-to-center distance E (see FIG. 2) between the elastic filaments 21 is preferably 0.1 mm or more from the viewpoint of achieving both improvement in stretchability and improvement in flexibility as a sheet. , More preferably 0.5 mm or more, still more preferably 0.7 mm or more, still more preferably 1 mm or more, and preferably less than 10 mm, more preferably 8 mm or less, still more preferably 5 mm or less, still more preferably 2 mm or less.
  • the center-to-center distance E may be constant for all elastic filaments, or may be different between one elastic filament 21 and another elastic filament 21.
  • the center-to-center distance E is not constant, the average value of the center-to-center distances between the elastic filaments 21 is preferably within the above-described preferable range, and the center-to-center distances between all the elastic filaments 21 are within the above-described preferable range. Is more preferable.
  • the center-to-center distance between adjacent elastic filaments 21 is measured by enlarging with a microscope a cut surface obtained by cutting the sample of the elastic composite sheet 1 in the direction Y orthogonal to the direction X in which the elastic filaments 21 extend. The measurement is performed at three or more arbitrary points, and the average value is used as the average value of the center-to-center distance.
  • the seal portion 4 is intermittently formed in the orthogonal direction Y orthogonal to the direction in which the elastic filament 21 extends, and one seal portion 4 is provided between the seal portions 4 adjacent to each other in the orthogonal direction Y.
  • the presence of at least two elastic filaments 21 is preferable from the viewpoint of improving stretchability and flexibility.
  • the seal portion 4 includes a seal portion row R4 in series in a direction Y orthogonal to a direction X in which the elastic filament 21 extends. It is preferably formed in multiple rows in the direction X.
  • the non-stretchable sheet 3 is adjacent to the stretchable composite sheet 1 in the one direction X in which the elastic filaments 21 extend.
  • Each of the ridges 31 extends in the orthogonal direction Y, and a groove 32 is formed between the ridges 31 adjacent to each other in the one direction X, and each groove 32 also extends in the orthogonal direction Y. ing.
  • the inside of the ridge portion 31 is hollow, but the inside is in a state where the density is clearly lower than the fiber density of the surface layer of the ridge portion 31, for example, 1 compared to the fiber density of the surface layer. It may be a space where fibers exist in a state of a fiber density of /5 or less.
  • the stretchable composite sheet 1 has an overall basis weight of preferably 15 g/m 2 or more, more preferably 20 g/m 2 or more, still more preferably 30 g/m 2 or more, even more preferably. and at 40 g / m 2 or more, and preferably 100 g / m 2 or less, more preferably 80 g / m 2 or less, more preferably 70 g / m 2 or less, even more preferably from 60 g / m 2 or more, and preferably 15 g / m 2 or more 100 g / m 2 or less, more preferably 20 g / m 2 or more 80 g / m 2 or less, more preferably 30 g / m 2 or more 70 g / m 2 or less, even more preferably 40 g / m 2 or more 60 g / It is m 2 or less.
  • the stretchable composite sheet 1 has a distance L3 between the tops of the ridges 31 in the one direction X, which is the direction in which the elastic filaments 21 extend, from the viewpoint of slipperiness of the skin and flexibility of the sheet (see FIG. 3).
  • the thickness T3 (see FIG. 3) of the portion having the ridges 31 is equal to that of the groove portion 32 between the ridges 31.
  • the thickness T4 is preferably 2 times or more, more preferably 4 times or more, further preferably 10 times or more, preferably 120 times or less, more preferably 100 times or less, further preferably 80 times or less, It is more preferably 60 times or less, preferably 2 times or more and 120 times or less, more preferably 4 times or more and 100 times or less, still more preferably 10 times or more and 80 times or less, still more preferably 10 times or more and 60 times or less. Is.
  • the thickness T3 (see FIG. 3) of the portion having the ridge portion 31 is preferably 0.1 mm or more, more preferably Is 0.2 mm or more, more preferably 0.5 mm or more, still more preferably 1 mm or more, and preferably 6 mm or less, more preferably 5 mm or less, still more preferably 4 mm or less, still more preferably 3 mm or less, Further, it is preferably 0.1 mm or more and 6 mm or less, more preferably 0.2 mm or more and 5 mm or less, still more preferably 0.5 mm or more and 4 mm or less, still more preferably 1 mm or more and 3 mm or less.
  • the thickness T3 is measured by sandwiching the stretchable composite sheet 1 in a natural state without applying tension with a load of 0.5 cN/cm 2 between the flat plates and measuring the distance between the flat plates.
  • the length L3 and the thickness T4 are measured by enlarging the ends sandwiched between the flat plates with a microscope or the like.
  • the thickness T4 of the groove portion 32 portion between the ridge portions 31 is measured at the center position of the groove portion 32 portion between the ridge portions 31 and where the seal portion 4 does not exist.
  • FIG. 6 to 8 are diagrams showing a preferred method of manufacturing the stretchable composite sheet 1 of the above-described embodiment.
  • a preferable method for producing the elastic composite sheet 1 of the above-described embodiment which is one embodiment of the method for producing the elastic composite sheet of the present invention, will be described.
  • the method of manufacturing a stretchable composite sheet shown in FIGS. 6 to 8 includes a precursor manufacturing step of manufacturing a composite material 2A which is a precursor of a stretchable sheet, and a stretchable sheet obtained by subjecting the composite material 2A to a stretching process.
  • the method includes a step of obtaining stretchability and a sheet sealing step of partially joining the stretchable sheet 2 and the non-stretchable sheet 3 to obtain a stretchable composite sheet.
  • a plurality of elastic filaments 21 are stretched in one direction, and in a substantially non-stretched state, the sheet material 20 is formed. , 20 to obtain a composite material 2A which is a precursor of the stretchable sheet. More specifically, while drawing a large number of molten elastic filaments 21 spun from the spinning nozzle 16 at a predetermined speed and stretching, the elastic filaments 21 do not cross each other before solidification of the elastic filaments 21.
  • the elastic filaments 21 are welded to a sheet containing a fibrous material, preferably two sheet materials 20 made of non-woven fabric so as to be arranged in one direction. Thereby, the plurality of elastic filaments 21 are bonded to the sheet materials 20 and 20 over their entire length in a substantially non-stretched state to manufacture the composite material 2A as a precursor of the elastic sheet.
  • the spinning nozzle 16 shown in FIG. 6 is provided in the spinning head 17, and the spinning head 17 is connected to the extruder.
  • the resin can also be supplied to the spinning head 17 via a gear pump.
  • the elastic resin melt-kneaded by the extruder is supplied to the spinning head 17.
  • the spinning head 17 has a large number of spinning nozzles 16 linearly arranged in a line.
  • the spinning nozzle 16 is arranged along the width direction of the two sheet materials 20, 20.
  • the spun melted elastic filaments 21 merge with the two sheet materials 20 and 20 which are respectively fed at the same speed from the original fabric, and are sandwiched between the two sheet materials 20 and 20 and taken at a predetermined speed. ..
  • the take-up speed of the elastic filament 21 matches the pay-out speed of both sheet materials 20, 20.
  • the take-up speed of the elastic filament 21 is adjusted so that the draw ratio is 1.1 to 400 times, preferably 4 to 100 times, and more preferably 10 to 80 times the resin discharge speed in the spinning nozzle hole.
  • the elastic filament 21 joins the two sheet materials 20 and 20 before solidification, that is, in a weldable state. As a result, the elastic filament 21 is welded to the two sheet materials 20 and 20 while being sandwiched between the two sheet materials 20 and 20. That is, the elastic filament 21 and the two sheet materials 20 and 20 are welded only by the heat of fusion caused by the elastic filament 21 that can be welded. As a result, the resulting stretchable sheet 2 is less likely to have hardness as would occur when an adhesive is applied to the entire boundary surface between the sheet materials 20 and 20, and is excellent in flexibility as a sheet. When joining the elastic filaments 21 with the two sheet materials 20, 20, the elastic filaments 21 are arranged in one direction without intersecting each other.
  • a stretch-developing treatment step that makes the sheet material 20 extensible is performed.
  • the tooth groove stretching device 25 is used to perform stretching processing on both sheet materials 20, 20.
  • This stretching process is a process of stretching the composite material 2A along the extending direction of the elastic filaments 21 to impart extensibility to both the sheet materials 20 and 20.
  • imparting the extensibility includes the case of greatly improving the extensibility of a sheet material having some extensibility.
  • the main part of the tooth space stretching device 25 is shown in FIG. 7(b).
  • teeth 7 has teeth, which are ridges extending in the axial direction, and grooves formed between the teeth and extending in the axial direction, alternately in the circumferential direction. As shown in FIG. 8, it is provided with a pair of tooth groove rolls 26 and 27 which mesh with each other. In the elasticity developing treatment step using the tooth groove stretching device 25, the composite material 2A obtained in the precursor manufacturing step is supplied between the pair of tooth groove rolls 26 and 27 and stretched to the composite material 2A. The stretchable sheet 2 in which the sheet materials 20 and 20 included in the composite material 2A are capable of stretching is obtained.
  • a general involute tooth profile or a cycloid tooth profile is used, and it is particularly preferable that the tooth width thereof is narrow.
  • the composite material 2A is hardly stretched as described above in the regions (between P3 and P2, between P1 and P4) in contact with the tips of the teeth 26a and 27a of the tooth groove rolls 26 and 27, but the teeth 26a and 27a are not stretched. Since the tip end of the composite material is unidirectionally pushed in the radial direction, that is, in the thickness direction of the composite material 2A, it becomes thin in the thickness direction.
  • FIGS. 6 and 7 show a case where the composite material 2A is wound into a roll to form a roll-shaped material 2R, and then the composite material 2A unwound from the roll-shaped material 2R is subjected to a stretching treatment.
  • the composite material 2A may be introduced into a tooth space extending device using the tooth space rolls 26 and 27 without being wound into a roll shape.
  • the stretchable sheet 2 thus obtained is stretched in the transport direction MD, and joined with the non-stretchable sheet 3 under the stretched state.
  • the stretchable sheet 2 and the non-stretchable sheet 3 are partially attached to the laminated sheet 10 in which the stretchable sheet 2 and the non-stretchable sheet 3 are stacked. Sealing process is applied to seal to.
  • any device capable of partially sealing the stretchable sheet 2 and the non-stretchable sheet 3 can be used.
  • a heat sealing device, an ultrasonic sealing device, a high frequency sealing device, or the like can be used.
  • the ratio of the distance A between the ends of the adjacent seal portions 4 to the distance C between the centers of the adjacent high basis weight portions 22 in the one direction X is 0.2.
  • the stretchable sheet 2 and the non-stretchable sheet 3 are partially joined by the seal portion 4 so that the number is 20 or less.
  • the stretchable sheet 2 has an extension ratio in the direction X in which the elastic filament 21 extends in the joining with the non-stretchable sheet 3, preferably 1.1 times or more, more preferably 1.2 times or more, and preferably. Is 5 times or less, more preferably 4.5 times or less, and preferably 1.1 times or more and 5 times or less, more preferably 1.2 times or more and 4.5 times or less.
  • the transport direction of both sheets 2 and 3 and the direction X in which the elastic filament 21 extends are the same.
  • the stretch ratio of the stretchable sheet 2 is obtained by dividing the length in the stretched state by the length in a state where no external force before stretching is applied, that is, the length in the natural state.
  • the stretchable sheet 2 is pulled by a tensile tester in a direction X in which the elastic filament 21 extends at a pulling rate of 300 mm/min, and the length of the stretchable sheet 2 in the direction X at the time when the stress becomes 3.0 N. It is preferably 1.1 times or more and 5 times or less the length in the direction X in the natural state.
  • an ultrasonic sealing device 40 provided with an ultrasonic horn 42 is used to partially stretch the stretchable sheet 2 and the non-stretchable sheet 3 between the stretchable sheet 2 and the non-stretchable sheet 3.
  • a case is shown in which a sealing process is performed to achieve a positive seal.
  • the ultrasonic sealing device 40 shown in FIG. 7 includes a support roll 41 that supports the surface of the laminated sheet 10 opposite to the ultrasonic wave application surface facing the ultrasonic horn 42 side. Further, on the tip end surface of the ultrasonic horn 42 or the surface of the support roll 41, a sealing convex portion (not shown) is formed in a pattern corresponding to the sealing portion 4 formed on the stretchable composite sheet 1, and laminated.
  • the stretchable sheet 2 is formed in the laminated sheet 10 by applying ultrasonic waves to the laminated sheet 10 with the ultrasonic horn 42 while sandwiching the sheet 10 between the support roll 41 and the ultrasonic horn 42.
  • a seal in which one or both of the sheet materials constituting the sheet material 20 and the non-stretchable sheet 3 are melted or softened, and the stretchable sheet 2 and the non-stretchable sheet 3 are partially joined by a seal.
  • the part 4 is formed.
  • the ultrasonic wave application surface of the laminated sheet 10 facing the ultrasonic horn 42 side may be formed of the stretchable sheet 2 or the non-stretchable sheet 3, but the ultrasonic horn 42 of the ultrasonic horn 42 may be formed.
  • reference numerals 28 and 29 are nip rolls, and reference numeral 3R is a roll-shaped material around which the non-stretchable sheet 3 is wound.
  • the support roll 41 may be a roll that is driven to rotate or a driven roll that rotates along with the conveyed sheet. Instead of the support roll 41, a non-rotating support member may be used.
  • the direction X in which the elastic filament 21 extends is defined as the conveyance direction MD of the laminated sheet 10.
  • a plurality of sealing projections (not shown) intermittently arranged in a direction corresponding to the width direction of the laminated sheet 10.
  • the laminated sheet 10 in which the seal portion 4 is intermittently formed in the direction X in which the elastic filament 21 extends is obtained. ..
  • the seal part 4 may be a seal part continuously extending in a direction Y orthogonal to the direction X in which the elastic filament 21 extends, but as in the stretchable composite sheets 1 and 1A shown in FIGS. It is preferable that the sheet 21 is intermittently formed in the direction Y orthogonal to the extending direction X from the viewpoint of further improving the flexibility of the sheet.
  • the laminated sheet 10 on which the seal portion 4 is formed is released from the tension applied in the transport direction MD, and contracted in the same direction as the direction X in which the elastic filament 21 extends, whereby the non-stretchable sheet 3 Portions located between the seal portions 4 in the one direction X project in a direction away from the elastic sheet 2.
  • the stretchable composite sheet 1 having the plurality of ridges 31 as shown in FIG. 1 is obtained.
  • the sheet materials 20 and 20 constituting the stretchable sheet 2 nonwoven fabrics such as air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, etc., are used. Can be used. These nonwovens can be continuous filaments or short fiber nonwovens.
  • the sheet materials 20 and 20 may be of the same kind or of different kinds.
  • the "same type of sheet material” is a sheet having the same manufacturing process of the sheet material, the type of the constituent fibers of the sheet material, the fiber diameter and length of the constituent fibers, the thickness and the basis weight of the sheet material, and the like. It means materials.
  • the sheet materials 20 and 20 that form the stretchable sheet 2 have the high grammage portion 22 and the low grammage portion 23 after being subjected to the stretching process using the tooth space stretching device 25.
  • the same sheet materials as the sheet materials 20 and 20 included in the stretchable sheet 2 can be used.
  • the non-stretchable sheet 3 may be the same or different from one or both of the sheet materials 20 constituting the stretchable sheet 2.
  • the thickness of the non-stretchable sheet 3 in a single state is preferably 0.1 mm or more, more preferably 0.12 mm or more, still more preferably 0.15 mm or more, still more preferably 0.18 mm or more, preferably 1 mm. Or less, more preferably 0.8 mm or less, still more preferably 0.7 mm or less, still more preferably 0.5 mm or less, and preferably 0.1 mm or more and 1 mm or less, more preferably 0.12 mm or more and 0.8 mm or less. , More preferably 0.15 mm or more and 0.7 mm or less, and even more preferably 0.18 mm or more and 0.5 mm or less. The thickness is measured by sandwiching the plates with a load of 0.5 cN/cm 2 and measuring the distance between the plates.
  • a substantially inelastic non-elastic fiber can be used as the constituent fibers of the sheet materials 20 and 20 and the non-stretchable sheet 3.
  • the sheet materials 20 and 20 are mainly composed of the non-elastic fiber.
  • the substantially inelastic inelastic fiber include fibers made of polyester such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyamide, and the like.
  • the constituent fibers may be short fibers or long fibers, and may be hydrophilic or water repellent.
  • core-sheath type or side-by-side type composite fibers can also be used. These fibers may be used alone or in combination of two or more.
  • a preferable example of the constituent fibers of the sheet materials 20 and 20 and the non-stretchable sheet 3 is one composed of two or more components of a low melting point component and a high melting point component.
  • a core-sheath type composite fiber is preferable, and a core having a high melting point PET or PP and a sheath having a low melting point PET, PP or PE is preferable.
  • the elastic filament 21 is made of an elastic resin such as a thermoplastic elastomer or rubber as a raw material.
  • an elastic resin such as a thermoplastic elastomer or rubber
  • thermoplastic elastomer examples include styrene such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butadiene-styrene), SEPS (styrene-ethylene-propylene-styrene).
  • SBS styrene-butadiene-styrene
  • SIS styrene-isoprene-styrene
  • SEBS styrene-ethylene-butadiene-styrene
  • SEPS styrene-ethylene-propylene-styrene
  • olefin-based elastomers ethylene-based ⁇ -olefin elastomers, propylene-based elastomers obtained by copolymerizing ethylene-butene-octene, etc.
  • polyester-based elastomers polyurethane-based elastomers, etc., and one of these may be used alone or Two or more kinds can be used in combination.
  • the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above-described embodiment.
  • the stretchable composite sheet 1 shown in FIG. 1 the positions of the individual seal portions 4 in the orthogonal direction Y are the same between the adjacent seal portion rows R4.
  • the stretchable composite sheet manufactured in (2) may have two or three or more seal portion rows in which the positions of the individual seal portions 4 in the orthogonal direction Y are different.
  • the positions in the orthogonal direction Y of the individual seal portions 4 may be shifted by a half pitch between the adjacent seal portion rows R4.
  • the stretchable composite sheet of the present invention and the stretchable composite sheet produced by the present invention are used for an outer casing of a disposable diaper including a pant-type outer casing and an absorbent main body fixed to the inner surface side of the outer casing.
  • the entire exterior body may be composed of one physically continuous elastic composite sheet, or a part of the exterior body may be composed of the elastic composite sheet according to the present invention. ..
  • a part of the surface of the various articles that is arranged to face the human skin is made of the stretchable composite sheet according to the present invention, while the other part is stretched from the stretchable composite sheet.
  • the non-stretchable sheet 3 may be used alone.
  • the stretchable sheet 2 in the stretchable composite sheet 1 of the above-described embodiment has a plurality of elastic filaments 21 sandwiched and fixed between two sheet materials 20, 20, but the stretchable composite sheet of the present invention is
  • the elastic sheet forming the sheet may have a plurality of elastic filaments fixed to only one sheet material 20. In that case, it is preferable that the stretchable sheet has the non-stretchable sheet 3 on the side where the elastic filaments are fixed.
  • the shape of the seal portion 4 in plan view is not limited to a circle, but may be other shapes such as an ellipse, a quadrangle, a triangle, a pentagon, and a heart shape of a playing card.
  • the elastic filament 21 is bonded to the sheet materials 20 and 20 in a substantially non-stretched state in the precursor manufacturing step.
  • the elastic filaments 21 may be joined to the sheet materials 20 and 20 in an expanded state.
  • the present invention further discloses the following elastic composite sheet and a method for producing the elastic composite sheet.
  • a plurality of elastic filaments arranged so as to extend in one direction without intersecting with each other are joined to a stretchable sheet material containing a fibrous material along their entire length in a substantially non-stretched state, A stretchable composite sheet having a stretchable stretchable sheet, and a non-stretchable sheet partially joined to one side of the stretchable sheet,
  • the elastic sheet has a high basis weight portion and a low basis weight portion alternately in the one direction, A seal portion in which the stretchable sheet and the non-stretchable sheet are combined is formed intermittently in the one direction,
  • the ratio (A/C) of the end-to-end distance A between the seal portions adjacent in the one direction to the center-to-center distance C between the high basis weight portions adjacent in the one direction is 0.2 or more and 20 or less.
  • the stretchable composite sheet wherein the non-stretchable sheet forms a ridge portion extending in an orthogonal direction orthogonal to the one direction between the seal portions adjacent to each other in the one direction.
  • the ratio (A/C) of the end-to-end distance A between the seal parts adjacent in the one direction to the center-to-center distance C between the high basis weight parts adjacent in the one direction is preferably 1 or more and 15 or less.
  • the stretchable composite sheet according to ⁇ 1> which is preferably 1.5 or more and 5.0 or less is more preferable.
  • the center-to-center distance C between the high basis weight portions adjacent to each other in the one direction is 1 mm or more and less than 5 mm
  • the end-to-end distance A between the seal portions adjacent to each other in the one direction is 1 mm or more to 20 mm or less.
  • the center-to-center distance C between the high basis weight portions adjacent to each other in the one direction is preferably 1 mm or more, more preferably 1.5 mm or more, still more preferably 1.7 mm or more, still more preferably 2 mm or more, and preferably Is 5 mm or less, more preferably 4 mm or less, still more preferably 3.5 mm or less, even more preferably 3 mm or less, more preferably 1.5 mm or more and 4 mm or less, still more preferably 1.7 mm or more and 3.5 mm or less.
  • the distance A between the end portions of the seal portions adjacent to each other in the one direction is preferably 1 mm or more, more preferably 1.5 mm or more, further preferably 2 mm or more, even more preferably 3 mm or more, preferably 20 mm or less. , More preferably 15 mm or less, further preferably 10 mm or less, still more preferably 5 mm or less, more preferably 1.5 mm or more and 15 mm or less, further preferably 2 mm or more and 10 mm or less, still more preferably 3 mm or more and 5 mm or less.
  • the stretchable composite sheet according to any one of ⁇ 1> to ⁇ 4>.
  • the seal portion is formed intermittently in the orthogonal direction,
  • the ratio (B/E) of the distance B between the ends of the seal portions that are adjacent to each other in the orthogonal direction to the distance E between the centers of the elastic filaments that are adjacent to each other in the orthogonal direction is 0.1 or more and 100 or less.
  • the ratio (B/E) of the end-to-end distance B between the seal portions adjacent to each other in the orthogonal direction to the center distance E between the elastic filaments adjacent to each other in the orthogonal direction is preferably 0.1 or more, It is preferably 0.2 or more, more preferably 0.3 or more, preferably 100 or less, more preferably 80 or less, still more preferably 50 or less, more preferably 0.2 or more and 80 or less, further preferably 0.
  • ⁇ 8> The stretchable composite sheet according to any one of ⁇ 1> to ⁇ 7>, wherein a center-to-center distance E between the elastic filaments adjacent to each other in the orthogonal direction is 0.1 mm or more and less than 10 mm.
  • the center-to-center distance E between the elastic filaments adjacent to each other in the orthogonal direction is preferably 0.1 mm or more, more preferably 0.5 mm or more, still more preferably 0.7 mm or more, still more preferably 1 mm or more, and Preferably less than 10 mm, more preferably 8 mm or less, even more preferably 5 mm or less, even more preferably 2 mm or less, more preferably 0.5 mm or more and 8 mm or less, still more preferably 0.7 mm or more and 5 mm or less, even more preferably
  • the stretchable composite sheet according to any one of ⁇ 1> to ⁇ 7>, which is 1 mm or more and 2 mm or less.
  • the seal portion is intermittently formed in the orthogonal direction, and one or more elastic filaments are present between the seal portions adjacent to each other in the orthogonal direction.
  • ⁇ 1> to ⁇ 9>> The stretchable composite sheet according to any one of ⁇ 1>.
  • the distance B between the end portions of the seal portions adjacent to each other in the orthogonal direction is preferably 1 mm or more, more preferably 2 mm or more, further preferably 3 mm or more, preferably 10 mm or less, more preferably 8 mm or less, further preferably Is 5 mm or less, more preferably 4 mm or less, more preferably 2 mm or more and 8 mm or less, still more preferably 2 mm or more and 5 mm or less, still more preferably 3 mm or more and 4 mm or less, in the above ⁇ 1> to ⁇ 11>.
  • the stretchable composite sheet according to any one of items.
  • the non-stretchable sheet has substantially no stretchability in either the direction in which the elastic filament extends or the direction orthogonal thereto, and the stretchability in all directions parallel to the front and back surfaces thereof.
  • Each of the ridges 31 extends in the orthogonal direction, a groove is formed between the ridges adjacent in the one direction, and each of the grooves also extends in the orthogonal direction. 1> to the stretchable composite sheet according to any one of ⁇ 13>.
  • the sheet material can be obtained by alternately supplying the composite material between a pair of tooth groove rolls meshing with each other and having axially extending ridges and grooves along the circumferential direction, and stretching the composite material.
  • a stretch expression treatment step for obtaining a stretchable sheet that can be stretched The stretchable sheet is laminated on a non-stretchable sheet in a state of being stretched in the one direction, and the stretchable sheet and the non-stretchable sheet are partially separated by a plurality of sealing portions in the one direction with a space therebetween.
  • a sheet sealing step of obtaining a stretchable composite sheet by joining In the sheet sealing step, in the one direction, a ratio of an end-to-end distance between the adjacent seal parts to a center-to-center distance between the adjacent high basis weight parts is 0.2 or more and 20 or less,
  • the stretch-developing treatment step when the composite material passes between the tooth groove rolls, the composite material is a tooth of the tooth groove roller that is the driven roller due to the tooth surface of the tooth groove roller that is the driving roller.
  • the stretchable sheet preferably has a stretch ratio in the extending direction of the elastic filament of 1.1 times or more, more preferably 1.2 times, when being joined to the non-stretchable sheet.
  • Example 1 By performing a sheet sealing process with the sealing device 40 shown in FIG. 7 on the laminated sheet 10 in which the following elastic sheet is superposed with the non-elastic sheet in the stretched state, the elastic sheet and the non-elastic sheet are separated.
  • the stretchable composite sheet of Example 1 having the partially joined circular seal portion 4 in a plan view was obtained.
  • ⁇ Stretchable sheet> A laminated sheet having elastic filaments sandwiched between two spunbonded non-woven fabrics formed of non-elastic fibers is used as a raw sheet of a stretchable sheet, and the raw sheet is conveyed in the filament orientation direction. Meanwhile, the stretchable sheet was obtained by supplying between the pair of tooth groove rolls of the tooth groove stretching device. A large number of elastic filaments are arranged in parallel with each other at a predetermined interval on the original sheet and the elastic sheet.
  • Elastic filament Styrenic thermoplastic elastomer
  • Inelastic fiber PP fiber
  • thickness 17 ⁇ m Sheet basis weight of the raw sheet 45 g/m 2
  • Non-stretchable sheet Spunbond nonwoven fabric formed from PP fibers.
  • Basis weight 18g/m 2
  • Table 1 shows the dimensions of each part in the produced stretchable composite sheet.
  • the meanings of the notations in the table are as follows.
  • the one direction X is the same direction as the extending direction of the elastic filaments
  • the orthogonal direction Y is the direction orthogonal to the extending direction of the elastic filaments.
  • Lattice arrangement An arrangement in which multiple rows of seal parts are formed in one direction, and the positions of the individual seal parts are the same between adjacent seal part rows (see Fig. 2)
  • Staggered arrangement An arrangement in which multiple rows of seal parts are formed in one direction, and the positions of the individual seal parts are offset by a half pitch between adjacent seal part rows (see FIG. 9).
  • Diameter of seal part Diameter of seal part [Dimension measured in standard extension state] Distance between centers of high basis weight portions C: Distance between centers of high basis weight portions adjacent to each other in one direction X Distance between end portions of seal portion A: Distance between end portions of adjacent seal portions in one direction X Ratio ( A/C): Ratio of end-to-end distance A to center-to-center distance C End-to-end distance B of seal part: End-to-end distance between seal parts adjacent in the orthogonal direction Y Ratio (B/C): Center-to-center distance Ratio of distance between ends B to C Distance between centers of low basis weight parts D: Distance between centers of low basis weight parts adjacent in one direction X Elastic filament spacing E: Center of adjacent elastic filaments in the orthogonal direction Y Distance (dimensions measured in contracted state) Distance L3 between ridges: Distance between tops of ridges 31 in one direction X (see FIG. 3) Thickness T3 of ridge portion: Thickness T3 of the portion having the
  • Examples 2 to 3 Except for changing the pattern of the seal portion formed by the sealing device 40, the stretchable composite sheet was manufactured in the same manner as in Example 1 with the dimensions and ratios of each portion changed as shown in Table 1.
  • the MMD value (average deviation of friction coefficient) was measured by the following method to evaluate the skin slipperiness.
  • the MMD value serves as an index of the surface roughness of the skin-facing surface of the sheet that is the measurement target, and the smaller the MMD value, the less the friction with the wearer's skin and the higher the evaluation. Therefore, the slipperiness of the skin on the sheet to be evaluated can be evaluated from the measured MMD value.
  • ⁇ MMD value measurement method> Using a commercially available measuring device (KES-FB4 surface tester manufactured by Kato Tech Co., Ltd.), the sheet to be measured is MMD under the conditions of speed: 0.1 cm/s, initial tension: 400 g, roughness pressurization: 10 gf. The value was measured.
  • the MMD value serves as an index of the surface roughness of the measurement object, and the smaller the MMD value, the less the friction with the skin of the wearer and the higher the evaluation.
  • Example 4 A stretchable composite sheet was produced in the same manner as in Example 1 except that the pattern of the seal portion formed by the seal device 40 was changed as follows. Distance between ends of seal part A: 1.5 mm Distance between ends of seal part B: 3.5 mm
  • Example 5 A stretchable composite sheet was produced in the same manner as in Example 1 except that the pattern of the seal portion formed by the seal device 40 was changed as follows. Distance between ends of seal part A: 1.5 mm Distance B between seal ends: 10.0 mm
  • Elongation rate (1) Method: A rectangular test with a width of 50 mm and a length of more than 100 mm from the stretchable composite sheets obtained in Examples 1 to 5 so that the number of seal portions included in the width direction is the same. I cut out a piece. The test piece was placed in a tensile tester (Tensilon (registered trademark): manufactured by Orientec Co., Ltd.: model: AG-1/50N-10kN) so that the chuck distance was 100 mm and the initial tension was 0.01 to 0.05N. Set to.
  • tensile tester Teensilon (registered trademark): manufactured by Orientec Co., Ltd.: model: AG-1/50N-10kN
  • the test piece was pulled at a pulling speed of 300 mm/min, and the distance between chucks when the stress reached 3.0 N was measured. The value obtained by dividing the distance between chucks when the stress reached 3.0 N by the distance between chucks before pulling (100 mm) was defined as the elongation rate.
  • the stretchable composite sheet of the present invention is excellent in sheet flexibility and skin slipperiness. According to the method for producing a stretchable composite sheet of the present invention, such a stretchable composite sheet can be efficiently produced.

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Abstract

In the present invention, a plurality of elastic filaments (21), which are arranged so as to extend in one direction (X) without crossing each other, are joined, over the entire length thereof, in a substantially non-extended state, to an extendable sheet material (20). A stretchable sheet (2) that is stretchable in the one direction (X) and a non-stretchable sheet (3) that is partially joined to one surface side of the stretchable sheet (2) are included. The stretchable sheet (2) has high basis weight sections (22) and low basis weight sections (23) that are arranged alternately in the one direction (X). Seal parts (4) to which the stretchable sheet (2) and the non-stretchable sheet (3) are bound are formed intermittently in the one direction (X). The ratio (A/C) of the distance (A) between the edges of the seal parts (4) adjacent in the one direction (X) to the distance (C) between the centers of the high basis weight sections (22) adjacent in the one direction X is 0.2-20. In a contracted state, protruding ridge parts (31) extending in a direction (Y) orthogonal to the one direction (X) are formed in the non-stretchable sheet (3) between seal parts (4) adjacent in the one direction (X).

Description

伸縮性複合シート及びその製造方法Stretchable composite sheet and manufacturing method thereof
　本発明は、伸縮性を有する伸縮性複合シート及びその製造方法に関する。 The present invention relates to a stretchable composite sheet having stretchability and a method for manufacturing the same.
　弾性フィラメントが不織布に伸長状態で固定されたシート材を、一対の歯溝ロール間に供給して、該シート材に延伸加工を施すことによって、該シート材に伸縮性の高い部分と伸縮性の低い部分とを形成して伸縮性シートとする技術が提案されている（特許文献１）。
　また出願人は、そのような伸縮性シートを伸長状態で非伸縮性シートと接合した後、収縮させて、非伸縮性シート側に襞状の凸条部を有する伸縮性複合シートとする技術を提案している（特許文献２）。 A sheet material in which elastic filaments are fixed in a stretched state on a non-woven fabric is supplied between a pair of tooth groove rolls, and the sheet material is stretched, whereby a highly stretchable portion and a stretchable portion of the sheet material are provided. A technique has been proposed in which a stretchable sheet is formed by forming a low portion (Patent Document 1).
In addition, the applicant has proposed a technique of joining such a stretchable sheet in a stretched state with a non-stretchable sheet, and then shrinking the stretchable sheet to obtain a stretchable composite sheet having a fold-shaped ridge portion on the non-stretchable sheet side. Proposed (Patent Document 2).
特開２００８－１７９１２８号公報JP, 2008-179128, A 特開２００９－１６０９１９号公報JP, 2009-160919, A
　本発明は、互いに交差せずに一方向に延びるように配列した複数の弾性フィラメントが、実質的に非伸長状態で、それらの全長にわたり、繊維材料を含み伸長可能なシート材に接合されており、前記一方向に伸縮可能な伸縮性シートと、該伸縮性シートの片面側に部分的に接合されている非伸縮性シートとを有する伸縮性複合シートを提供するものである。
　前記伸縮性複合シートを前記一方向に伸長させた伸長状態において、前記伸縮性シートは、前記一方向に高坪量部及び低坪量部を交互に有している。
　前記伸縮性複合シートを前記一方向に伸長させた伸長状態において、前記伸縮性シートと前記非伸縮性シートとが結合したシール部が、前記一方向に間欠的に形成されている。
　前記伸縮性複合シートを前記一方向に伸長させた伸長状態において、前記一方向に隣り合う前記高坪量部どうしの中心間距離Ｃに対する、該一方向に隣り合う前記シール部どうしの端部間距離Ａの比（Ａ／Ｃ）が、０．２以上２０以下である。
　前記伸縮性複合シートを前記一方向に収縮させた収縮状態において、前記非伸縮性シートが、前記一方向に隣り合う前記シール部どうし間に、該一方向に直交する直交方向に延びる凸条部を形成している。 According to the present invention, a plurality of elastic filaments arranged so as to extend in one direction without intersecting with each other are bonded to a stretchable sheet material containing a fiber material over their entire length in a substantially non-stretched state. Provided is a stretchable composite sheet having a stretchable sheet that is stretchable in one direction and a non-stretchable sheet that is partially joined to one side of the stretchable sheet.
In the stretched state in which the stretchable composite sheet is stretched in the one direction, the stretchable sheet has high grammage portions and low grammage portions alternately in the one direction.
In the stretched state in which the stretchable composite sheet is stretched in the one direction, the seal portion in which the stretchable sheet and the non-stretchable sheet are combined is intermittently formed in the one direction.
In the stretched state in which the stretchable composite sheet is stretched in the one direction, between the end portions of the seal portions adjacent in the one direction with respect to the center distance C between the high basis weight portions adjacent in the one direction. The ratio (A/C) of the distance A is 0.2 or more and 20 or less.
In the contracted state in which the stretchable composite sheet is contracted in the one direction, the non-stretchable sheet has a ridge portion extending in the orthogonal direction orthogonal to the one direction between the seal portions adjacent to each other in the one direction. Is formed.
　また本発明は、前記の伸縮性複合シートの製造方法を提供するものである。
　本発明の伸縮性複合シートの製造方法は、複数本の弾性フィラメントを、一方向に延びるように、シート材に接合して、伸縮性シートの前駆体である複合材を得る前駆体製造工程を有する。
　本発明の伸縮性複合シートの製造方法は、軸方向に延びる突条部及び溝部を周方向に沿って交互に有し、互いに噛み合う一対の歯溝ロール間に、前記複合材を供給し、該複合材を延伸させることで、前記シート材が伸長可能となった伸縮性シートを得る伸縮性発現処理工程を有する。
　本発明の伸縮性複合シートの製造方法は、前記伸縮性シートを前記一方向に伸長させた状態で非伸縮性シートに積層し、前記伸縮性シート及び前記非伸縮性シートを、複数のシール部により前記一方向に間隔をあけて部分的に接合することで伸縮性複合シートを得るシートシール工程を有する。
　前記シートシール工程では、前記一方向において、隣り合う前記高坪量部どうしの中心間距離に対する、隣り合う前記シール部どうしの端部間距離の比が０．２以上２０以下となるように、前記伸縮性シートと前記非伸縮性シートとを前記シール部で部分的に接合する。 The present invention also provides a method for producing the stretchable composite sheet.
The method for producing a stretchable composite sheet of the present invention comprises a precursor production step of joining a plurality of elastic filaments to a sheet material so as to extend in one direction to obtain a composite material which is a precursor of the stretchable sheet. Have.
The method for producing a stretchable composite sheet of the present invention has ridges and grooves extending in the axial direction alternately along the circumferential direction, and supplies the composite material between a pair of tooth groove rolls that mesh with each other, By stretching the composite material, there is a stretch development processing step of obtaining a stretchable sheet in which the sheet material is stretchable.
The method for producing a stretchable composite sheet of the present invention is a method in which the stretchable sheet is laminated on a non-stretchable sheet in a state of being stretched in the one direction, and the stretchable sheet and the non-stretchable sheet are provided with a plurality of sealing parts. According to the above, there is a sheet sealing step of obtaining the stretchable composite sheet by partially joining the one direction with an interval.
In the sheet sealing step, in the one direction, the ratio of the distance between the ends of the adjacent seal portions to the distance between the centers of the adjacent high basis weight portions is 0.2 or more and 20 or less, The stretchable sheet and the non-stretchable sheet are partially joined at the seal portion.
図１は、本発明の一実施形態である伸縮性複合シートを模式的に示す斜視図である。FIG. 1 is a perspective view schematically showing a stretchable composite sheet that is an embodiment of the present invention. 図２は、図１に示す伸縮性複合シートの伸長状態を模式的に示す平面図である。FIG. 2 is a plan view schematically showing the stretched state of the stretchable composite sheet shown in FIG. 図３は、図２に示す伸縮性複合シートのＩＩＩ－ＩＩＩ線断面図である。FIG. 3 is a sectional view taken along the line III-III of the stretchable composite sheet shown in FIG. 図４は、図２に示す伸縮性複合シートのＩＶ－ＩＶ線断面図である。FIG. 4 is a sectional view taken along line IV-IV of the stretchable composite sheet shown in FIG. 図５は、本発明の伸縮性複合シートを構成する伸縮性シートの好ましい例を示す、弾性フィラメントが延びる方向Ｘに沿う断面図である。FIG. 5 is a cross-sectional view taken along the direction X in which the elastic filament extends, showing a preferred example of the elastic sheet that constitutes the elastic composite sheet of the present invention. 図６は、本発明の伸縮性複合シートの好ましい製造方法における伸縮性シートの前駆体製造工程を示す斜視図である。FIG. 6 is a perspective view showing a stretch sheet precursor manufacturing step in a preferable method for producing a stretch composite sheet of the present invention. 図７は、本発明の伸縮性複合シートの好ましい製造方法における伸縮性発現処理工程及びシートシール工程を示す図で、（ａ）は全体の概略図、（ｂ）は歯溝延伸装置の斜視図である。7A and 7B are diagrams showing a stretch-developing treatment step and a sheet-sealing step in a preferred method for producing a stretchable composite sheet of the present invention, wherein FIG. 7A is an overall schematic diagram, and FIG. Is. 図８は、図７（ｂ）に示す歯溝延伸装置を用いて歯溝延伸処理を行う様子を示す歯溝ロールの噛み合い部の拡大断面図である。FIG. 8 is an enlarged cross-sectional view of the meshing portion of the tooth groove roll showing how the tooth groove extending process is performed using the tooth groove extending device shown in FIG. 7B. 図９は、本発明の他の実施形態である伸縮性複合シートの図２相当図である。FIG. 9 is a view corresponding to FIG. 2 of a stretchable composite sheet which is another embodiment of the present invention. 図１０は、本発明の実施例の伸縮性複合シートの評価結果を示す図で、（ａ）は柔らかさの評価結果を示す図、（ｂ）は肌の滑りやすさの評価結果を示す図である。10: is a figure which shows the evaluation result of the elastic composite sheet of the Example of this invention, (a) is a figure which shows the evaluation result of softness, (b) is a figure which shows the evaluation result of the slipperiness of skin. Is. 図１１は、本発明の実施例の伸縮性複合シートの伸長率の評価結果を示す図で、（ａ）は実施例１～３の伸長率の評価結果を示す図、（ｂ）はは実施例３～５の伸長率の評価結果を示す図である。FIG. 11 is a diagram showing the evaluation results of the elongation rate of the stretchable composite sheet of the example of the present invention, FIG. 11A is a diagram showing the evaluation results of the elongation rate of Examples 1 to 3, and FIG. It is a figure which shows the evaluation result of the expansion rate of Examples 3-5.
発明の詳細な説明Detailed Description of the Invention
　特許文献１の伸縮性シート及び特許文献２の伸縮性複合シートは、シートとしての柔軟性及び肌の滑りやすさを向上させる点で改善の余地があった。 The elastic sheet of Patent Document 1 and the elastic composite sheet of Patent Document 2 have room for improvement in terms of improving the flexibility as a sheet and the slipperiness of the skin.
　本発明は、前述した従来技術が有する欠点を解消し得る伸縮性複合シート及びその効率的な製造方法に関する。 The present invention relates to a stretchable composite sheet that can solve the above-mentioned drawbacks of the conventional technology and an efficient manufacturing method thereof.
　以下本発明をその好ましい実施形態に基づき図面を参照しながら説明する。図１及び図２には、本発明の伸縮性複合シートの一実施形態である伸縮性複合シート１が示されている。図１、図３及び図４には、伸縮性複合シート１が、弾性フィラメント２１が延びる方向である一方向Ｘに収縮して凸条部３１が形成されている状態が示されており、図２には、伸縮性複合シート１が、前記一方向Ｘに伸長された状態が示されている。図２に示す伸長状態においては、凸条部３１を形成していたシート材２０が、ほぼ平坦となっている。 Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. 1 and 2 show a stretchable composite sheet 1 which is an embodiment of the stretchable composite sheet of the present invention. 1, 3 and 4 show a state in which the stretchable composite sheet 1 is contracted in one direction X, which is the direction in which the elastic filament 21 extends, and the ridge portion 31 is formed. 2 shows a state in which the stretchable composite sheet 1 is stretched in the one direction X. In the extended state shown in FIG. 2, the sheet material 20 on which the ridge portions 31 are formed is substantially flat.
　伸縮性複合シート１は、図１～図４に示すように、互いに交差せずに一方向Ｘに延びるように配列した複数の弾性フィラメント２１が、実質的に非伸長状態で、それらの全長にわたり、繊維材料を含み伸長可能なシート材２０，２０に接合されており、前記一方向Ｘに伸縮可能な伸縮性シート２と、伸縮性シート２の片面側に部分的に接合されている非伸縮性シート３とを有している。 As shown in FIGS. 1 to 4, the stretchable composite sheet 1 has a plurality of elastic filaments 21 arranged so as to extend in one direction X without intersecting each other in a substantially non-stretched state over the entire length thereof. The stretchable sheet 2 that is stretchable in the one direction X and is joined to the stretchable sheet materials 20, 20 that include a fiber material, and the non-stretchable sheet that is partially joined to one side of the stretchable sheet 2. The property sheet 3 is included.
　伸縮性複合シート１を構成する伸縮性シート２は、図４に示すように、２枚のシート材２０，２０に複数の弾性フィラメント２１が接合された構成を有しており、それら複数の弾性フィラメント２１は、図２に示すように、互いに交差せずに一方向Ｘに延び、且つ該一方向Ｘと直交する方向Ｙに間隔をあけて配置されている。複数の弾性フィラメント２１は、それぞれ、伸縮性シート２の一方向Ｘの全長にわたって、実質的に非伸長状態で、２枚のシート材２０，２０に接合されている。 As shown in FIG. 4, the elastic sheet 2 that constitutes the elastic composite sheet 1 has a structure in which a plurality of elastic filaments 21 are joined to two sheet materials 20 and 20, and the plurality of elastic materials is used. As shown in FIG. 2, the filaments 21 extend in one direction X without intersecting each other, and are arranged at intervals in a direction Y orthogonal to the one direction X. Each of the plurality of elastic filaments 21 is joined to the two sheet materials 20, 20 in a substantially non-stretched state over the entire length of the stretchable sheet 2 in the one direction X.
　伸縮性シート２を構成する２枚のシート材２０，２０は、何れも伸長可能である。２枚のシート材２０，２０は、実質的に非弾性の繊維を含んでなるものであり、実質的に非弾性である。弾性フィラメントの「弾性」及びシート材２０の非弾性の「弾性」とは、伸ばすことができ、且つ元の長さに対して１００％伸ばした状態（元の長さの２００％の長さになる）から力を解放したときに、元の長さの１２５％以下の長さまで戻る性質である。
　シート材２０，２０は、弾性フィラメント２１の延びる方向Ｘと同方向に伸長可能となっている。本明細書において、「伸長可能」とは、（イ）シート材２０，２０の構成繊維自体が伸長する場合と、（ロ）構成繊維自体は伸長しなくても、交点において結合していた繊維どうしが離れたり、繊維どうしの結合等により複数本の繊維で形成された立体構造が構造的に変化したり、構成繊維がちぎれたり、繊維のたるみが引き伸ばされたりして、不織布全体として伸長する場合とを包含する。
　各シート材２０，２０は、弾性フィラメント２１と接合される前の原反の状態で既に伸長可能になっていてもよい。或いは、弾性フィラメント２１と接合される前の原反の状態では伸長可能ではないが、弾性フィラメント２１と接合された後に伸長可能となるように加工が施されて、伸長可能になるものであってもよい。シート材を伸長可能にするための具体的な方法としては、熱処理、ロール間延伸、歯溝やギアによるかみ込み延伸、テンターによる引張延伸などが挙げられる。後述する伸縮性複合シートの好適な製造方法に鑑みると、弾性フィラメント２１を、シート材２０に溶着させるときの該シート材２０の搬送性が良好になる等の点から、該シート材２０はその原反の状態では伸長可能でないことが好ましい。 Each of the two sheet materials 20 and 20 that form the stretchable sheet 2 is extensible. The two sheet materials 20 and 20 include substantially inelastic fibers, and are substantially inelastic. The "elasticity" of the elastic filaments and the inelastic "elasticity" of the sheet material 20 mean that the elastic filament can be stretched and is stretched by 100% with respect to the original length (to a length of 200% of the original length. When the force is released from the above, it has a property of returning to a length of 125% or less of the original length.
The sheet materials 20 and 20 can extend in the same direction as the extending direction X of the elastic filament 21. In the present specification, “extendable” means that (a) the constituent fibers themselves of the sheet materials 20 and 20 are stretched and (b) the constituent fibers themselves are not stretched but are bonded at the intersections. The nonwoven fabric as a whole expands due to separation between the fibers, structural change of the three-dimensional structure formed by multiple fibers due to bonding of fibers, breaking of constituent fibers, stretching of slack of fibers, etc. Including cases and.
Each of the sheet materials 20 and 20 may be already stretchable in the original state before being joined to the elastic filament 21. Alternatively, it is not extensible in the original state before being joined with the elastic filament 21, but is processed so as to be extensible after being joined with the elastic filament 21 so that it can be extended. Good. Specific methods for making the sheet material extensible include heat treatment, inter-roll stretching, bite stretching with tooth spaces and gears, and tensile stretching with a tenter. In view of a preferable method for producing a stretchable composite sheet described below, the sheet material 20 is made to have a good transportability when the elastic filament 21 is welded to the sheet material 20. It is preferable that the material is not stretchable in the original state.
　伸縮性シート２を構成する複数の弾性フィラメント２１は、図２に示すように、それぞれ、伸縮性シート２及び伸縮性複合シート１の全長にわたって実質的に連続している。各弾性フィラメント２１は弾性樹脂を含んでいる。複数の弾性フィラメント２１が互いに交差せずに一方向Ｘに延びるように配列していることによって、伸縮性シート２及びその伸縮性シート２を用いた伸縮性複合シート１は、弾性フィラメント２１が延びる方向に伸長させたときに、該方向に直交する幅が縮む幅縮みが生じにくい利点がある。各弾性フィラメント２１は、互いに交差しない限り、直線状に延びていてもよく、或いは蛇行しながら延びていてもよい。 The plurality of elastic filaments 21 constituting the stretchable sheet 2 are substantially continuous over the entire lengths of the stretchable sheet 2 and the stretchable composite sheet 1, respectively, as shown in FIG. Each elastic filament 21 contains an elastic resin. By arranging the plurality of elastic filaments 21 so as to extend in the one direction X without intersecting with each other, the elastic filaments 21 of the elastic sheet 2 and the elastic composite sheet 1 using the elastic sheet 2 are extended. When it is extended in the direction, there is an advantage that the width shrinkage in which the width orthogonal to the direction is reduced hardly occurs. The elastic filaments 21 may extend linearly or may extend in a meandering manner as long as they do not intersect with each other.
　各弾性フィラメント２１は、実質的に非伸長状態でシート材２０，２０に接合されている。弾性フィラメント２１は、糸状の合成ゴムや天然ゴムであり得る。或いは乾式紡糸（溶融紡糸）や、湿式紡糸によって得られたものであり得る。弾性フィラメント２１は、これを一旦巻き取ることなしに直接溶融紡糸によって得られたものであることが好ましい。また、弾性フィラメント２１は、未延伸糸を延伸して得られたものであることが好ましい。また弾性フィラメント２１は、弾性樹脂が溶融又は軟化した状態で延伸されて形成されたものであることが好ましい。弾性樹脂が溶融又は軟化した状態で延伸されることで、弾性フィラメント２１を、非伸長状態でシート材２０に接合させることが容易となる。
　延伸の具体的な操作としては、（ａ）弾性フィラメント２１の原料となる樹脂を溶融紡糸して一旦未延伸糸を得、その未延伸糸の弾性フィラメントを再度加熱して軟化温度（ハードセグメントのガラス転移点温度Ｔｇ）以上の状態で延伸する操作や、（ｂ）弾性フィラメント２１の原料となる樹脂を溶融紡糸して得られた溶融状態の繊維を直接延伸する操作が挙げられる。後述する伸縮性複合シートの好適な製造方法においては、弾性フィラメント２１は、溶融紡糸して得られた溶融状態の繊維を直接延伸することにより得られる。 Each elastic filament 21 is joined to the sheet members 20, 20 in a substantially non-stretched state. The elastic filaments 21 may be thread-shaped synthetic rubber or natural rubber. Alternatively, it may be obtained by dry spinning (melt spinning) or wet spinning. The elastic filaments 21 are preferably obtained by direct melt spinning without winding the filament once. The elastic filament 21 is preferably obtained by drawing an undrawn yarn. The elastic filament 21 is preferably formed by stretching the elastic resin in a molten or softened state. By stretching the elastic resin in a molten or softened state, it becomes easy to bond the elastic filament 21 to the sheet material 20 in a non-stretched state.
As a specific operation of drawing, (a) a resin as a raw material of the elastic filament 21 is melt-spun to obtain an undrawn yarn once, and the elastic filament of the undrawn yarn is heated again to soften (hard segment Examples include an operation of drawing in a state of a glass transition point temperature Tg) or higher, and an operation of directly drawing (b) a molten fiber obtained by melt spinning a resin that is a raw material of the elastic filament 21. In a preferred method for producing a stretchable composite sheet described below, the elastic filaments 21 are obtained by directly drawing the molten fibers obtained by melt spinning.
　各弾性フィラメント２１は、その全長にわたってシート材２０，２０に接合されている。「その全長にわたって接合されている」とは、弾性フィラメント２１と接触しているすべての繊維（シート材２０の構成繊維）が、該弾性フィラメント２１と接合されていることを要せず、弾性フィラメント２１に、意図的に形成された非接合部が存在しないような態様で、弾性フィラメント２１とシート材２０の構成繊維とが接合されていることをいう。弾性フィラメント２１とシート材２０，２０との接合の様式としては、例えば溶着、接着剤による接着などが挙げられる。溶融紡糸により得られた弾性フィラメント２１の固化前に、該弾性フィラメント２１をシート材２０に溶着させることも好ましい。この場合、シート材２０と弾性フィラメント２１とを接合させる前に、補助的な接合手段として接着剤を塗布することができる。或いは、各シート材２０と弾性フィラメント２１とを接合させた後に、補助的な接合手段として、熱処理（スチームジェット、ヒートエンボス）や、機械交絡（ニードルパンチ、スパンレース）などを行うこともできる。シート材２０と弾性フィラメント２１との接合は、溶融又は軟化した状態の弾性フィラメント２１が、シート材２０と接触した状態で固化することのみによって達成されていることが、シートの柔軟性の向上の点から好ましい。 Each elastic filament 21 is joined to the sheet materials 20 and 20 over its entire length. The phrase “joined over the entire length thereof” does not require that all the fibers (the constituent fibers of the sheet material 20) that are in contact with the elastic filament 21 are joined to the elastic filament 21, and the elastic filament 21 is It means that the elastic filaments 21 and the constituent fibers of the sheet material 20 are joined in such a manner that the intentionally formed non-joined portion does not exist in the sheet 21. Examples of the manner of joining the elastic filament 21 and the sheet materials 20, 20 include welding and adhesion with an adhesive. It is also preferable to weld the elastic filament 21 to the sheet material 20 before solidifying the elastic filament 21 obtained by melt spinning. In this case, an adhesive can be applied as an auxiliary joining means before joining the sheet material 20 and the elastic filament 21. Alternatively, after joining the sheet materials 20 and the elastic filaments 21, heat treatment (steam jet, heat embossing), mechanical entanglement (needle punching, spun lace), or the like can be performed as auxiliary joining means. The joining of the sheet material 20 and the elastic filament 21 is achieved only by solidifying the elastic filament 21 in a molten or softened state in contact with the sheet material 20, which improves the flexibility of the sheet. It is preferable from the point.
　伸縮性シート２は、弾性フィラメント２１の延びる方向Ｘと同方向に伸縮可能になっている。伸縮性シート２の伸縮性は、弾性フィラメント２１の弾性に起因して発現する。伸縮性シート２を、弾性フィラメント２１の延びる方向と同方向に引き伸ばすと、弾性フィラメント２１並びにシート材２０，２０が伸長する。そして伸縮性シート２の引き伸ばしを解除すると、弾性フィラメント２１が収縮し、その収縮に連れてシート材２０が引き伸ばし前の状態に復帰する。 The elastic sheet 2 can be expanded and contracted in the same direction X as the elastic filament 21 extends. The elasticity of the elastic sheet 2 is developed due to the elasticity of the elastic filament 21. When the stretchable sheet 2 is stretched in the same direction as the extending direction of the elastic filament 21, the elastic filament 21 and the sheet materials 20 and 20 are stretched. Then, when the stretching of the stretchable sheet 2 is released, the elastic filament 21 contracts, and the sheet material 20 returns to the state before stretching with the contraction.
　伸縮性シート２としては、非伸縮性のシート材２０，２０に非伸長状態の弾性フィラメント２１を接合して非伸長性の複合材２Ａを作製した後、この複合材２Ａを原反シートとして、図７に示すように、凸条部と溝とを交互に有し互いに噛合う一対の凹凸面間、具体的には、歯溝を有する一対のロール２６，２７間に通過させることによって伸縮性を発現させたものを使用することが好ましい。 As the stretchable sheet 2, after the non-stretchable composite material 2A is manufactured by joining the non-stretchable sheet materials 20 and 20 with the elastic filaments 21 in the non-stretched state, the composite material 2A is used as a raw sheet. As shown in FIG. 7, elasticity is obtained by passing between a pair of concavo-convex surfaces that alternately have ridges and grooves and mesh with each other, specifically, between a pair of rolls 26 and 27 having tooth grooves. It is preferable to use a product that expresses.
　図５には、伸縮性複合シート１に用いる伸縮性シート２の好ましい例として、図７に示すように、非伸長性の複合材２Ａを、一対の歯溝ロール２６，２７間に通して製造した伸縮性シート２における、弾性フィラメント２１が延びる方向Ｘに沿う断面図が示されている。図５に示す形態の伸縮性シートは、非伸長性の複合材２Ａから伸縮性シート２を得るための伸縮性発現処理工程に歯溝延伸装置を用いた場合に顕著に発現する形態である。 In FIG. 5, as a preferable example of the stretchable sheet 2 used for the stretchable composite sheet 1, as shown in FIG. 7, a non-stretchable composite material 2A is manufactured by passing it between a pair of tooth gap rolls 26, 27. A cross-sectional view of the stretchable sheet 2 along the direction X in which the elastic filament 21 extends is shown. The stretchable sheet in the form shown in FIG. 5 is a form that is remarkably exhibited when the tooth space stretching device is used in the stretchability developing treatment step for obtaining the stretchable sheet 2 from the non-stretchable composite material 2A.
　図５に示すように、伸長状態の伸縮性シート２においては、弾性フィラメント２１が延びる方向Ｘに沿って、高坪量部２２と低坪量部２３とが交互に配列している。高坪量部２２及び低坪量部２３は、弾性フィラメント２１の延びる方向Ｘと直交する方向Ｙにそれぞれ帯状に延びている。高坪量部２２と低坪量部２３とは、一定の周期で交互に配列していることが好ましい。高坪量部２２は、低坪量部２３に比較して坪量が大きく且つ厚みも大きくなっている。低坪量部２３は、高坪量部２２に比較して坪量が小さく且つ厚みも小さくなっている。各高坪量部２２は、互いに実質的に等幅であることが好ましく、各低坪量部２３も、互いに実質的に等幅であることが好ましい。各高坪量部２２が、実質的に等幅であるとは、複数の高坪量部２２のうち、幅が最大であるものと幅が最小であるものとの幅の差が１０％以内であることを意味する。各低坪量部２３が、実質的に等幅であるとは、複数の低坪量部２３のうち、幅が最大であるものと幅が最小であるものとの幅の差が１０％以内であることを意味する。 As shown in FIG. 5, in the stretchable sheet 2 in the stretched state, the high grammage portions 22 and the low grammage portions 23 are alternately arranged along the direction X in which the elastic filaments 21 extend. The high grammage portion 22 and the low grammage portion 23 each extend in a strip shape in a direction Y orthogonal to a direction X in which the elastic filament 21 extends. It is preferable that the high grammage portions 22 and the low grammage portions 23 are alternately arranged at a constant cycle. The high grammage section 22 has a larger grammage and a larger thickness than the low grammage section 23. The low grammage portion 23 has a smaller grammage and a smaller thickness than the high grammage portion 22. It is preferable that the high grammage portions 22 are substantially equal in width to each other, and the low grammage portions 23 are also preferably equal in width to each other. That each high basis weight portion 22 has substantially the same width means that the difference in width between the one having the largest width and the one having the smallest width is within 10% among the plurality of high basis weight portions 22. Means that. That each low basis weight portion 23 has substantially the same width means that the difference in width between the one having the largest width and the one having the smallest width is within 10% among the plurality of low basis weight portions 23. Means that.
　本発明に使用する伸縮性シート２は、シート強度（材料強度）の観点から、高坪量部２２の厚みが、好ましくは０．１ｍｍ以上、より好ましくは０．２ｍｍ以上、更に好ましくは０．３ｍｍ以上、より更に好ましくは０．５ｍｍ以上であり、また好ましくは２ｍｍ以下、より好ましくは１．５ｍｍ以下、更に好ましくは１．４ｍｍ以下、より更に好ましくは１．２ｍｍ以下であり、また、好ましくは０．１ｍｍ以上２ｍｍ以下、より好ましくは０．２ｍｍ以上１．５ｍｍ以下、更に好ましくは０．３ｍｍ以上１．４ｍｍ以下、より更に好ましくは０．５ｍｍ以上１．２ｍｍ以下である。また、本発明に使用する伸縮性シート２は、低坪量部２３の厚みが、高坪量部２２の厚みに対して、好ましくは１０％以上、より好ましくは２０％以上、更に好ましくは３０％以上、より更に好ましくは４０％以上であり、また好ましくは８０％以下、より好ましくは７０％以下、更に好ましくは６０％以下、より更に好ましくは５０％以下であり、また、好ましくは１０％以上８０％以下、より好ましくは２０％以上７０％以下、更に好ましくは３０％以上６０％以下、より更に好ましくは４０％以上５０％以下である。
　ここでいう高坪量部２２及び低坪量部２３の厚みは、伸縮性複合シート１中の伸縮性シート２における伸長状態での２枚のシート材２０，２０の合計（２層）の不織布繊維の厚みである。 In the stretchable sheet 2 used in the present invention, from the viewpoint of sheet strength (material strength), the thickness of the high basis weight portion 22 is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0. 3 mm or more, more preferably 0.5 mm or more, preferably 2 mm or less, more preferably 1.5 mm or less, still more preferably 1.4 mm or less, even more preferably 1.2 mm or less, and also preferably Is 0.1 mm or more and 2 mm or less, more preferably 0.2 mm or more and 1.5 mm or less, still more preferably 0.3 mm or more and 1.4 mm or less, and still more preferably 0.5 mm or more and 1.2 mm or less. In the stretchable sheet 2 used in the present invention, the thickness of the low basis weight portion 23 is preferably 10% or more, more preferably 20% or more, still more preferably 30% of the thickness of the high basis weight portion 22. % Or more, more preferably 40% or more, preferably 80% or less, more preferably 70% or less, still more preferably 60% or less, still more preferably 50% or less, and preferably 10%. It is 80% or more and 80% or less, more preferably 20% or more and 70% or less, further preferably 30% or more and 60% or less, and still more preferably 40% or more and 50% or less.
The thickness of the high grammage portion 22 and the low grammage portion 23 here is the total (two layers) of the two sheet materials 20 and 20 in the stretched state of the stretchable sheet 2 in the stretchable composite sheet 1. The thickness of the fiber.
〔高坪量部及び低坪量部の厚みの測定方法〕
　厚みの測定は、伸縮性シート２を、２０±２℃、６５±５％ＲＨの環境下に無荷重にて、２日以上放置した後、次の方法にて求める。
　先ず伸縮性シート２を、弾性フィラメントが延びる方向に、２～３倍の長さになるまで伸ばした状態にて、０．５ｃＮ／ｃｍ２の荷重にて平板間に挟む。断面をマイクロスコープにより５０～２００倍の倍率で観察し、高坪量部２２における厚みが最大箇所及び低坪量部２３における厚みの最小の箇所の厚みを測定する。高坪量部２２及び低坪量部２３のそれぞれについて３か所以上で測定し、それぞれの平均値を、高坪量部２２及び低坪量部２３の厚みとする。
　なお、２～３倍の長さになるまで伸ばした状態とは、２日以上放置後の自然状態の長さを、その長さの２～３倍の長さとなるまで伸長させた状態である。 [Method of measuring thickness of high basis weight portion and low basis weight portion]
The thickness is measured by allowing the stretchable sheet 2 to stand for 2 days or more in an environment of 20±2° C. and 65±5% RH under no load for 2 days, and then obtaining the following method.
First, the stretchable sheet 2 is sandwiched between flat plates with a load of 0.5 cN/cm 2 in a state where the stretchable sheet 2 is stretched in the extending direction of the elastic filaments to a length of 2 to 3 times. The cross section is observed with a microscope at a magnification of 50 to 200 times, and the thickness of the high grammage portion 22 having the maximum thickness and the low grammage portion 23 having the minimum thickness are measured. Each of the high grammage portion 22 and the low grammage portion 23 is measured at three or more places, and the average value of each is set as the thickness of the high grammage portion 22 and the low grammage portion 23.
The state of being extended to a length of 2 to 3 times is a state in which the length of the natural state after being left for 2 days or more is extended to a length of 2 to 3 times the length. ..
　本発明に使用する伸縮性シート２は、破断等の材料強度の点から、高坪量部２２の坪量が、好ましくは２０ｇ／ｍ２以上、より好ましくは２５ｇ／ｍ２以上、更に好ましくは３０ｇ／ｍ２以上、より更に好ましくは３６ｇ／ｍ２以上であり、また好ましくは９０ｇ／ｍ２以下、より好ましくは８０ｇ／ｍ２以下、更に好ましくは７０ｇ／ｍ２以下、より更に好ましくは６０ｇ／ｍ２以下であり、また、好ましくは２０ｇ／ｍ２以上９０ｇ／ｍ２以下、より好ましくは２５ｇ／ｍ２以上８０ｇ／ｍ２以下、更に好ましくは３０ｇ／ｍ２以上７０ｇ／ｍ２以下、より更に好ましくは３６ｇ／ｍ２以上６０ｇ／ｍ２以下である。また、本発明に使用する伸縮性シート２は、低坪量部２３の坪量が、好ましくは１０ｇ／ｍ２以上、より好ましくは１２ｇ／ｍ２以上、更に好ましくは１３ｇ／ｍ２以上、より更に好ましくは１５ｇ／ｍ２以上であり、また好ましくは６０ｇ／ｍ２以下、より好ましくは５０ｇ／ｍ２以下、更に好ましくは４０ｇ／ｍ２以下、より更に好ましくは３０ｇ／ｍ２以下であり、また、好ましくは１０ｇ／ｍ２以上６０ｇ／ｍ２以下、より好ましくは１２ｇ／ｍ２以上５０ｇ／ｍ２以下、更に好ましくは１３ｇ／ｍ２以上４０ｇ／ｍ２以下、より更に好ましくは１５ｇ／ｍ２以上３０ｇ／ｍ２以下である。
　ここでいう高坪量部２２及び低坪量部２３の坪量は、伸縮性複合シート１中の伸縮性シート２における伸長状態時でのシート材２０、２０の２枚の総坪量である。 In the stretchable sheet 2 used in the present invention, the basis weight of the high basis weight portion 22 is preferably 20 g/m 2 or more, more preferably 25 g/m 2 or more, further preferably from the viewpoint of material strength such as breakage. 30 g/m 2 or more, more preferably 36 g/m 2 or more, preferably 90 g/m 2 or less, more preferably 80 g/m 2 or less, still more preferably 70 g/m 2 or less, still more preferably 60 g. /M 2 or less, and preferably 20 g/m 2 or more and 90 g/m 2 or less, more preferably 25 g/m 2 or more and 80 g/m 2 or less, further preferably 30 g/m 2 or more and 70 g/m 2 or less, More preferably, it is 36 g/m 2 or more and 60 g/m 2 or less. In the stretchable sheet 2 used in the present invention, the basis weight of the low basis weight portion 23 is preferably 10 g/m 2 or more, more preferably 12 g/m 2 or more, further preferably 13 g/m 2 or more. more preferably not more 15 g / m 2 or more, and preferably 60 g / m 2 or less, more preferably 50 g / m 2 or less, more preferably 40 g / m 2 or less, even more preferably at 30 g / m 2 or less, Further, it is preferably 10 g/m 2 or more and 60 g/m 2 or less, more preferably 12 g/m 2 or more and 50 g/m 2 or less, still more preferably 13 g/m 2 or more and 40 g/m 2 or less, still more preferably 15 g/m 2. It is 2 or more and 30 g/m 2 or less.
The grammage of the high grammage part 22 and the low grammage part 23 here is the total grammage of the two sheet materials 20, 20 in the stretched state of the elastic sheet 2 in the elastic composite sheet 1. ..
〔高坪量部及び低坪量部の坪量の測定方法〕
＜第１測定方法＞
　高坪量部及び低坪量部がそれぞれ切り出すのに十分な平面視面積を有する場合は、高坪量部及び低坪量部のそれぞれについて、１０個の小片を切り出し、電子天秤を用いてそれぞれの質量を測定し、該１０個の小片の質量の平均値を、該１０個の小片の面積の平均値で除して、その値を坪量とする。
＜第２測定方法＞
　低坪量部が細幅過ぎて切り出し難い場合等には、以下の方法により坪量を求めることもできる。
　高坪量部及び低坪量部の坪量の測定対象である伸縮性シート２の製造に使用した複合材２Ａの任意の箇所から小片を１０個切り出す。得られた複合材２Ａの小片１０個について、電子天秤を用いてそれぞれの質量を測定し、該１０個の小片の質量の平均値を、該１０個の小片の面積の平均値で除して、その値を、複合材２Ａの坪量とする。この複合材２Ａの坪量を、高坪量部２２の坪量とする。また、前述した厚みの測定方法により、伸縮性シート２の高坪量部２２及び低坪量部２３の厚みを測定し、高坪量部２２の厚みＬＡに対する測定された低坪量部２３の厚みＬＢの比（ＬＢ／ＬＡ）を算出する。算出された比（ＬＢ／ＬＡ）を前述の複合材２Ａの坪量（高坪量部２２の坪量）に乗じて得られた値を、低坪量部２３の坪量とする。 [Method of measuring basis weight of high basis weight part and low basis weight part]
<First measuring method>
When the high grammage portion and the low grammage portion each have a sufficient plan view area to be cut out, 10 pieces are cut out for each of the high grammage portion and the low grammage portion, and each is cut using an electronic balance. Is measured, the average value of the mass of the 10 small pieces is divided by the average value of the areas of the 10 small pieces, and the value is taken as the basis weight.
<Second measuring method>
When the low grammage portion is too narrow to cut out, the grammage can be determined by the following method.
Ten small pieces are cut out from an arbitrary portion of the composite material 2A used for manufacturing the stretchable sheet 2 whose grammage of the high grammage part and the low grammage part is measured. The mass of each of the 10 small pieces of the obtained composite material 2A was measured using an electronic balance, and the average value of the masses of the 10 small pieces was divided by the average value of the areas of the 10 small pieces. , And the value is the basis weight of the composite material 2A. The basis weight of the composite material 2A is set as the basis weight of the high basis weight portion 22. Further, the method of measuring the thickness as described above, elasticity and the thickness of the high basis weight portion 22 and the low basis weight portion 23 of the sheet 2 is measured, high basis weight portion low basis weight portion 23 in which the thickness was measured for L A of 22 calculating the ratio of the thickness L B (L B / L a ). The calculated ratio (L B / L A) the value obtained by multiplying the basis weight of the composite 2A described above (basis weight of the high basis weight portion 22), the basis weight of the low basis weight portion 23.
　本発明に使用する非伸縮性シート３は、凸条部３１として、肌の滑りやすさに優れた凸条部３１を形成させる観点から、伸縮性を有しない。ここでいう伸縮性は、非伸縮性シート３自体の伸縮性である。
　非伸縮性シート３は、少なくとも、それに重ねた伸縮性シート２における弾性フィラメント２１が延びる方向Ｘにおいて伸縮性を有しないことが好ましく、弾性フィラメント２１が延びる方向Ｘ及びその直交方向Ｙの何れにも伸縮性を有しないことが好ましい。非伸縮性シート３は、弾性フィラメント２１が延びる方向Ｘ及びその直交方向Ｙの何れにおいても実質的に伸縮性を有していないことが好ましく、その表裏面と平行な方向の総ての方向において伸縮性を有しないことが好ましい。 The non-stretchable sheet 3 used in the present invention has no stretchability from the viewpoint of forming the ridge portion 31 having excellent slipperiness of the skin as the ridge portion 31. The stretchability referred to here is the stretchability of the non-stretchable sheet 3 itself.
It is preferable that the non-stretchable sheet 3 does not have stretchability at least in the direction X in which the elastic filaments 21 of the stretchable sheet 2 stacked on the non-stretchable sheet 3 extend. It is preferred that it has no stretchability. The non-stretchable sheet 3 preferably has substantially no stretchability in either the direction X in which the elastic filament 21 extends or the direction Y orthogonal thereto, and in all directions parallel to the front and back surfaces thereof. It is preferred that it has no stretchability.
　シートが、ある方向に実質的に伸縮性を有しないとは、該シートに対して当該ある方向に引っ張る力を加えても、該シートが、殆ど伸びないことを意味する。例えば、長さ１５×幅５ｃｍのサンプルに対して、該サンプルをテンシロン（登録商標）等の材料引っ張り試験機で長手方向に引っ張って、該サンプルが破断するときの破断伸度が１０％以下である場合、そのサンプルは、長手方向に伸縮性を有しない。
　なお、破断伸度とは（破断時の該サンプル長さ－該サンプルの元の長さ）／（該サンプルの元の長さ）×１００で算出することができる。なお、サンプルの長手方向は前述の「ある方向」と同じ方向である。 The fact that the sheet is not substantially stretchable in a certain direction means that the sheet hardly stretches even when a pulling force is applied to the sheet in the certain direction. For example, when a sample having a length of 15 cm and a width of 5 cm is pulled in the longitudinal direction by a material tensile tester such as Tensilon (registered trademark), the breaking elongation when the sample breaks is 10% or less. In some cases, the sample is not stretchable in the longitudinal direction.
The elongation at break can be calculated by (length of the sample at break-original length of the sample)/(original length of the sample)×100. The longitudinal direction of the sample is the same as the "certain direction" described above.
　本発明に係る伸縮性複合シート１は、伸縮性複合シート１に含まれる伸縮性シート２が、弾性フィラメント２１が延びる方向である一方向Ｘに高坪量部２２及び低坪量部２３を交互に有しており、伸縮性シート２と非伸縮性シート３とが結合したシール部４が、前記一方向Ｘに間欠的に形成されているものである。
　また伸縮性複合シート１は、弾性フィラメント２１が延びる方向である一方向Ｘにおいて隣り合う高坪量部２２どうしの中心間距離Ｃ（図２参照）に対する、該一方向Ｘに隣り合うシール部４，４どうしの端部間距離Ａ（図２参照）の比（Ａ／Ｃ）が、０．２以上２０以下である。
　前記比（Ａ／Ｃ）が、０．２以上であることによって、伸縮性複合シート１の主たる伸縮方向である、弾性フィラメント２１が延びる方向Ｘにおいて、隣り合うシール部４，４どうし間に、伸縮性シート２における伸縮性の高い低坪量部２３が存在しやすくなり、非伸縮性シート３が、凸条部３１を形成しやすくなる上に、肌の滑りやすさ、クッション性に優れた凸条部３１を形成しやすくなる。他方、前記比（Ａ／Ｃ）が、２０以下であることによって、凸条部３１の倒れ等の形成不良が防止される。
　尚、シール部４と高坪量部２２とは、伸縮性複合シート１の厚み方向に重なっていてもよいし、ずれていてもよい。 In the stretchable composite sheet 1 according to the present invention, the stretchable sheet 2 included in the stretchable composite sheet 1 has a high basis weight portion 22 and a low basis weight portion 23 alternately in one direction X, which is a direction in which the elastic filament 21 extends. The seal portion 4 in which the stretchable sheet 2 and the non-stretchable sheet 3 are joined is formed intermittently in the one direction X.
In addition, the stretchable composite sheet 1 includes the seal portions 4 adjacent to the one direction X with respect to the center distance C (see FIG. 2) between the high basis weight portions 22 adjacent to each other in the one direction X in which the elastic filament 21 extends. The ratio (A/C) of the end-to-end distance A (see FIG. 2) between the four and the four is 0.2 or more and 20 or less.
When the ratio (A/C) is 0.2 or more, in the direction X in which the elastic filament 21 extends, which is the main stretching direction of the stretchable composite sheet 1, between the adjacent seal portions 4 and 4, The low-basis-weight portion 23 having high elasticity in the elastic sheet 2 is likely to be present, and the non-elastic sheet 3 is easy to form the ridge portion 31 and is excellent in slipperiness of skin and cushioning property. It becomes easy to form the ridge portion 31. On the other hand, when the ratio (A/C) is 20 or less, formation defects such as collapse of the ridge portion 31 are prevented.
The seal portion 4 and the high basis weight portion 22 may overlap with each other in the thickness direction of the stretchable composite sheet 1 or may be offset from each other.
　肌の滑りやすさに優れる伸縮性複合シートは、各種製品のヒトの肌に触れる面に使用されたときに、肌との間の摩擦が低減され、例えば手などの身体の肌の一部を、凸条部３１が形成された面に触れた状態で動かしたときに滑らかな感触が得られる。
　ヒトの肌に触れる面を有する製品としては、使い捨ておむつ、生理用ナプキン、パンティライナー等の体液吸収性物品、下着のパンツ、パンティ、ブラジャー等の下着、衛生マスク、サポーター等が挙げられる。また肌の滑りやすさに優れる伸縮性複合シートを、凸条部３１が形成された面を着用者の肌側に向けて、パンツ型使い捨ておむつや下着のパンツの内面に使用した場合には、着脱するための上げ下げを抵抗なくスムーズに行うことができる等の利点も得られる。また伸縮性複合シートを、凸条部３１が形成された面を着用者の肌側とは反対側に向けて、パンツ型使い捨ておむつの外面や下着のパンツの外面に使用した場合には、通気性を想起させるような外観と下着を履かせた場合には下着との接触面積が低くなり履かせ易さの向上を期待することができる等の利点が得られる。 The elastic composite sheet, which excels in slipperiness of the skin, reduces friction with the skin when it is used on the surface of various products that comes into contact with human skin. A smooth feeling can be obtained when moving while touching the surface on which the ridge portion 31 is formed.
Examples of products having a surface that comes into contact with human skin include disposable diapers, sanitary napkins, body fluid absorbent articles such as panty liners, underwear for pants, panties, underwear such as bras, sanitary masks, and supporters. Further, when the stretchable composite sheet excellent in slipperiness of the skin is used for the inner surface of the pants-type disposable diaper or underwear with the surface on which the ridges 31 are formed facing the wearer's skin, There are also advantages such as smooth lifting and lowering for attachment/detachment without resistance. Further, when the stretchable composite sheet is used on the outer surface of the pants-type disposable diaper or the outer surface of the underpants of the underwear with the surface on which the ridges 31 are formed facing the side opposite to the wearer's skin, When the underwear is worn, the contact area with the underwear is reduced and the ease of wearing the underwear can be expected to be improved.
　肌の滑りやすさ、クッション性に優れた凸条部を形成させる観点から、前記比（Ａ／Ｃ）は、０．２以上であることがより好ましく、また２０以下であることがより好ましく、また１以上１５以下がより好ましく、１．５以上５．０以下が更に好ましい。
　同様の観点から、弾性フィラメント２１が延びる方向である一方向Ｘにおいて隣り合う低坪量部２３どうしの中心間距離Ｄ（図２参照）に対する、該一方向Ｘに隣り合うシール部４，４どうしの端部間距離Ａ（図２参照）の比（Ａ／Ｄ）も、前記比（Ａ／Ｃ）と同様の範囲であることが好ましい。 The ratio (A/C) is more preferably 0.2 or more, and more preferably 20 or less, from the viewpoint of forming a ridge having excellent slipperiness on the skin and cushioning properties. Moreover, 1 or more and 15 or less are more preferable, and 1.5 or more and 5.0 or less are still more preferable.
From the same viewpoint, the seal portions 4, 4 adjacent to each other in the one direction X with respect to the center distance D (see FIG. 2) between the low basis weight portions 23 adjacent in the one direction X, which is the direction in which the elastic filament 21 extends. The ratio (A/D) of the end-to-end distance A (see FIG. 2) is preferably in the same range as the ratio (A/C).
　高坪量部２２どうしの前記中心間距離Ｃ（図２参照）及びシール部４，４どうしの前記端部間距離Ａ（図２参照）は、伸縮性複合シート１を、引張試験機により弾性フィラメント２１が延びる方向である一方向Ｘに引張速度３００ｍｍ／ｍｉｎで伸長させ、応力が３．０Ｎとなった状態（以下「標準伸長状態」という）において測定する。尚、標準伸長状態においては、伸縮性複合シート１を、前記一方向Ｘに直交する方向Ｙには伸長させない。 The center-to-center distance C (see FIG. 2) between the high basis weight portions 22 and the end-to-end distance A (see FIG. 2) between the seal portions 4 and 4 are obtained by elastically stretching the stretchable composite sheet 1 by a tensile tester. The filament 21 is stretched in one direction X, which is the extending direction, at a tensile speed of 300 mm/min, and is measured in a state where the stress is 3.0 N (hereinafter, referred to as “standard stretched state”). In the standard stretched state, the stretchable composite sheet 1 is not stretched in the direction Y orthogonal to the one direction X.
　高坪量部２２どうしの前記中心間距離Ｃ（図２参照）は、伸縮性の観点から、好ましくは１ｍｍ以上、より好ましくは１．５ｍｍ以上、更に好ましくは１．７ｍｍ以上、より更に好ましくは２ｍｍ以上であり、また材料強度の観点から、好ましくは５ｍｍ以下、より好ましくは４ｍｍ以下、更に好ましくは３．５ｍｍ以下、より更に好ましくは３ｍｍ以下であり、それらの両立の観点から、好ましくは１ｍｍ以上５ｍｍ以下、より好ましくは１．５ｍｍ以上４ｍｍ以下、更に好ましくは１．７ｍｍ以上３．５ｍｍ以下、より更に好ましくは２ｍｍ以上３ｍｍ以下である。
　またシール部４，４どうしの前記端部間距離Ａ（図２参照）は、伸縮性の観点から、好ましくは１ｍｍ以上、より好ましくは１．５ｍｍ以上、更に好ましくは２ｍｍ以上、より更に好ましくは３ｍｍ以上であり、また凸条部形成の観点から、好ましくは２０ｍｍ以下、より好ましくは１５ｍｍ以下、更に好ましくは１０ｍｍ以下、より更に好ましくは５ｍｍ以下であり、それらの両立の観点から、好ましくは１ｍｍ以上２０ｍｍ以下、より好ましくは１．５ｍｍ以上１５ｍｍ以下、更に好ましくは２ｍｍ以上１０ｍｍ以下、より更に好ましくは３ｍｍ以上５ｍｍ以下である。 The center-to-center distance C (see FIG. 2) between the high grammage portions 22 is preferably 1 mm or more, more preferably 1.5 mm or more, still more preferably 1.7 mm or more, still more preferably from the viewpoint of elasticity. It is 2 mm or more, and from the viewpoint of material strength, preferably 5 mm or less, more preferably 4 mm or less, still more preferably 3.5 mm or less, still more preferably 3 mm or less. It is 5 mm or less, more preferably 1.5 mm or more and 4 mm or less, still more preferably 1.7 mm or more and 3.5 mm or less, and still more preferably 2 mm or more and 3 mm or less.
The distance A (see FIG. 2) between the ends of the seal portions 4 and 4 is preferably 1 mm or more, more preferably 1.5 mm or more, still more preferably 2 mm or more, and even more preferably from the viewpoint of elasticity. It is 3 mm or more, and preferably 20 mm or less, more preferably 15 mm or less, still more preferably 10 mm or less, still more preferably 5 mm or less, from the viewpoint of forming ridges, and preferably 1 mm from the viewpoint of compatibility thereof. 20 mm or less, more preferably 1.5 mm or more and 15 mm or less, still more preferably 2 mm or more and 10 mm or less, still more preferably 3 mm or more and 5 mm or less.
　また前記一方向Ｘにおけるシール部４の長さＬ４ｘ（図２参照）は、伸縮性と柔軟性の観点から、高坪量部２２どうしの前記中心間距離Ｃ（図２参照）に対する比（Ｌ４ｘ／Ｃ）が、好ましくは０．０２以上、より好ましくは０．０３以上、更に好ましくは０．０５以上、より更に好ましくは０．１以上であり、またより好ましくは２以下、より好ましくは１．５以下、更に好ましくは１以下、より更に好ましくは０．５以下であり、好ましくは２以下０．０２以上、より好ましくは１．５以下０．０３以上、更に好ましくは１以下０．０５以上、より更に好ましくは０．５以下０．１以上である。
　同様の観点から、シール部４の前記長さＬ４ｘ（図２参照）は、好ましくは０．１ｍｍ以上、より好ましくは０．２ｍｍ以上、更に好ましくは０．３ｍｍ以上、より更に好ましくは０．５ｍｍ以上であり、また好ましくは３ｍｍ以下、より好ましくは２ｍｍ以下、更に好ましくは１ｍｍ以下であり、また好ましくは０．１ｍｍ以上３ｍｍ以下、より好ましくは０．２ｍｍ以上２ｍｍ以下、更に好ましくは０．３ｍｍ以上２ｍｍ以下、より更に好ましくは０．５ｍｍ以上１ｍｍ以下である。 Further, the length L4x (see FIG. 2) of the seal portion 4 in the one direction X is a ratio (L4x) to the center distance C (see FIG. 2) between the high basis weight portions 22 from the viewpoint of elasticity and flexibility. /C) is preferably 0.02 or more, more preferably 0.03 or more, still more preferably 0.05 or more, still more preferably 0.1 or more, and further preferably 2 or less, more preferably 1 0.5 or less, more preferably 1 or less, still more preferably 0.5 or less, preferably 2 or less 0.02 or more, more preferably 1.5 or less 0.03 or more, still more preferably 1 or less 0.05. The above is more preferably 0.5 or less and 0.1 or more.
From the same viewpoint, the length L4x (see FIG. 2) of the seal portion 4 is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0.3 mm or more, still more preferably 0.5 mm. Or more, preferably 3 mm or less, more preferably 2 mm or less, still more preferably 1 mm or less, and preferably 0.1 mm or more and 3 mm or less, more preferably 0.2 mm or more and 2 mm or less, further preferably 0.3 mm. It is 2 mm or less and more preferably 0.5 mm or more and 1 mm or less.
　また伸縮性複合シート１は、図２に示すように、弾性フィラメント２１が延びる方向である一方向Ｘに間欠的に形成されたシール部４が、該一方向Ｘに直交する直交方向Ｙにおいても間欠的に形成されていることが、伸縮性複合シート１のシートとしての伸縮性と柔軟性を一層向上させる観点から好ましい。前記直交方向Ｙにおいて隣り合うシール部４間の端部間距離Ｂ（図２参照）は、高坪量部２２どうしの前記中心間距離Ｃ（図２参照）に対する比（Ｂ／Ｃ）が、好ましくは０．２以上、より好ましくは０．５以上、更に好ましくは０．８以上、より更に好ましくは１以上であり、また好ましくは１０以下、より好ましくは８以下、更に好ましくは６以下、より更に好ましくは３以下であり、また好ましくは０．２以上１０以下、より好ましくは０．５以上８以下、更に好ましくは０．８以上６以下、より更に好ましくは１以上３以下である。 In the stretchable composite sheet 1, as shown in FIG. 2, the seal portion 4 formed intermittently in the one direction X in which the elastic filament 21 extends also in the orthogonal direction Y orthogonal to the one direction X. It is preferable that the stretchable composite sheet 1 is formed intermittently from the viewpoint of further improving the stretchability and flexibility of the stretchable composite sheet 1 as a sheet. An end-to-end distance B (see FIG. 2) between the adjacent seal portions 4 in the orthogonal direction Y has a ratio (B/C) to the center-to-center distance C (see FIG. 2) between the high grammage portions 22. It is preferably 0.2 or more, more preferably 0.5 or more, still more preferably 0.8 or more, still more preferably 1 or more, and preferably 10 or less, more preferably 8 or less, further preferably 6 or less, It is more preferably 3 or less, preferably 0.2 or more and 10 or less, more preferably 0.5 or more and 8 or less, still more preferably 0.8 or more and 6 or less, still more preferably 1 or more and 3 or less.
　また前記端部間距離Ｂ（図２参照）は、伸縮応力、の観点から、好ましくは１ｍｍ以上、より好ましくは２ｍｍ以上、更に好ましくは３ｍｍ以上であり、また凸の襞形成の観点から、好ましくは１０ｍｍ以下、より好ましくは８ｍｍ以下、更に好ましくは５ｍｍ以下、より更に好ましくは４ｍｍ以下であり、それら両方の観点から、好ましくは１ｍｍ以上１０ｍｍ以下、より好ましくは２ｍｍ以上８ｍｍ以下、更に好ましくは２ｍｍ以上５ｍｍ以下、より更に好ましくは３ｍｍ以上４ｍｍ以下である。
　また前記端部間距離Ｂは、前記直交方向Ｙに沿うシール部４の長さＬ４ｙに対して、好ましくは０．５倍以上３０倍以下、より好ましくは１倍以上１０倍以下である。
　シール部４の前記長さＬ４ｙは、好ましくは０．１ｍｍ以上、より好ましくは０．２ｍｍ以上、更に好ましくは０．３ｍｍ以上、より更に好ましくは０．５ｍｍであり、また好ましくは５ｍｍ以下、より好ましくは３ｍｍ以下、更に好ましくは２ｍｍ以下、より更に好ましくは１．５ｍｍであり、また好ましくは０．１ｍｍ以上５ｍｍ以下、より好ましくは０．２ｍｍ以上３ｍｍ以下、更に好ましくは０．３ｍｍ以上２ｍｍ以下、より更に好ましくは０．５ｍｍ以上１．５ｍｍ以下である。
　シール部４，４どうしの前記端部間距離Ｂ（図２参照）、シール部の前記長さＬ４ｘ及び長さＬ４ｙも、前記標準伸長状態において測定する。 Further, the distance B between the ends (see FIG. 2) is preferably 1 mm or more, more preferably 2 mm or more, still more preferably 3 mm or more, from the viewpoint of stretching stress, and preferably from the viewpoint of forming a convex fold. Is 10 mm or less, more preferably 8 mm or less, still more preferably 5 mm or less, still more preferably 4 mm or less, and from both viewpoints, preferably 1 mm or more and 10 mm or less, more preferably 2 mm or more and 8 mm or less, and further preferably 2 mm. It is 5 mm or less and more preferably 3 mm or more and 4 mm or less.
The distance B between the ends is preferably 0.5 times or more and 30 times or less, more preferably 1 time or more and 10 times or less, with respect to the length L4y of the seal portion 4 along the orthogonal direction Y.
The length L4y of the seal portion 4 is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0.3 mm or more, still more preferably 0.5 mm, and more preferably 5 mm or less. It is preferably 3 mm or less, more preferably 2 mm or less, still more preferably 1.5 mm, and preferably 0.1 mm or more and 5 mm or less, more preferably 0.2 mm or more and 3 mm or less, still more preferably 0.3 mm or more and 2 mm or less. , And more preferably 0.5 mm or more and 1.5 mm or less.
The distance B between the end portions of the seal portions 4 and 4 (see FIG. 2) and the length L4x and the length L4y of the seal portion are also measured in the standard extension state.
　また弾性フィラメント２１が延びる方向Ｘと直交する直交方向Ｙにおける隣り合う弾性フィラメント２１どうしの中心間距離Ｅ（図２参照）に対する、シール部４，４どうしの前記端部間距離Ｂの比（Ｂ／Ｅ）は、伸縮性と通気性の観点から、好ましくは０．１以上、より好ましくは０．２以上、更に好ましくは０．３以上であり、好ましくは１００以下、より好ましくは８０以下、更に好ましくは５０以下であり、それら両方の観点から、好ましくは０．１以上１００以下、より好ましくは０．２以上８０以下、更に好ましくは０．３以上５０以下である。 Further, the ratio of the distance B between the end portions of the seal portions 4 and 4 to the center distance E (see FIG. 2) between the adjacent elastic filaments 21 in the orthogonal direction Y orthogonal to the direction X in which the elastic filament 21 extends (B /E) is preferably 0.1 or more, more preferably 0.2 or more, still more preferably 0.3 or more, preferably 100 or less, more preferably 80 or less, from the viewpoint of stretchability and air permeability. It is more preferably 50 or less, and from both viewpoints, it is preferably 0.1 or more and 100 or less, more preferably 0.2 or more and 80 or less, still more preferably 0.3 or more and 50 or less.
　また伸縮性複合シート１は、伸縮性の向上とシートとしての柔軟性の向上とを両立させる観点から、弾性フィラメント２１どうしの前記中心間距離Ｅ（図２参照）が、好ましくは０．１ｍｍ以上、より好ましくは０．５ｍｍ以上、更に好ましくは０．７ｍｍ以上、より更に好ましくは１ｍｍ以上であり、また好ましくは１０ｍｍ未満、より好ましくは８ｍｍ以下、更に好ましくは５ｍｍ以下、より更に好ましくは２ｍｍ以下であり、また好ましくは０．１ｍｍ以上１０ｍｍ未満、より好ましくは０．５ｍｍ以上８ｍｍ以下、更に好ましくは０．７ｍｍ以上５ｍｍ以下、より更に好ましくは１ｍｍ以上２ｍｍ以下である。前記中心間距離Ｅは、全ての弾性フィラメントで一定であっても良いし、一の弾性フィラメント２１間と他の弾性フィラメント２１間とで異なっていても良い。前記中心間距離Ｅが一定でない場合、弾性フィラメント２１間の中心間距離の平均値が、上述した好ましい範囲内であることが好ましく、全ての弾性フィラメント２１間の中心間距離が上述した好ましい範囲内であることが更に好ましい。 Further, in the stretchable composite sheet 1, the center-to-center distance E (see FIG. 2) between the elastic filaments 21 is preferably 0.1 mm or more from the viewpoint of achieving both improvement in stretchability and improvement in flexibility as a sheet. , More preferably 0.5 mm or more, still more preferably 0.7 mm or more, still more preferably 1 mm or more, and preferably less than 10 mm, more preferably 8 mm or less, still more preferably 5 mm or less, still more preferably 2 mm or less. It is preferably 0.1 mm or more and less than 10 mm, more preferably 0.5 mm or more and 8 mm or less, still more preferably 0.7 mm or more and 5 mm or less, still more preferably 1 mm or more and 2 mm or less. The center-to-center distance E may be constant for all elastic filaments, or may be different between one elastic filament 21 and another elastic filament 21. When the center-to-center distance E is not constant, the average value of the center-to-center distances between the elastic filaments 21 is preferably within the above-described preferable range, and the center-to-center distances between all the elastic filaments 21 are within the above-described preferable range. Is more preferable.
　隣り合う弾性フィラメント２１どうしの中心間距離は、伸縮性複合シート１のサンプルを、弾性フィラメント２１が延びる方向Ｘに直交する方向Ｙに切断した切断面を、マイクロスコープにて拡大して測定する。測定は、任意の３箇所以上にて行い、その平均値を中心間距離の平均値とする。 The center-to-center distance between adjacent elastic filaments 21 is measured by enlarging with a microscope a cut surface obtained by cutting the sample of the elastic composite sheet 1 in the direction Y orthogonal to the direction X in which the elastic filaments 21 extend. The measurement is performed at three or more arbitrary points, and the average value is used as the average value of the center-to-center distance.
　またシール部４は、図２に示すように、弾性フィラメント２１が延びる方向に直交する直交方向Ｙに間欠的に形成されており、該直交方向Ｙに隣り合うシール部４どうし間のそれぞれに１本以上の弾性フィラメント２１が存在していることが、伸縮性、柔軟性向上の点から好ましい。 As shown in FIG. 2, the seal portion 4 is intermittently formed in the orthogonal direction Y orthogonal to the direction in which the elastic filament 21 extends, and one seal portion 4 is provided between the seal portions 4 adjacent to each other in the orthogonal direction Y. The presence of at least two elastic filaments 21 is preferable from the viewpoint of improving stretchability and flexibility.
　本発明に係る伸縮性複合シート１は、図１に示すように、シール部４が、弾性フィラメント２１が延びる方向である一方向Ｘと直交する方向Ｙに直列したシール部列Ｒ４が、該一方向Ｘに多列に形成されていることが好ましい。 In the stretchable composite sheet 1 according to the present invention, as shown in FIG. 1, the seal portion 4 includes a seal portion row R4 in series in a direction Y orthogonal to a direction X in which the elastic filament 21 extends. It is preferably formed in multiple rows in the direction X.
　本発明に係る伸縮性複合シート１は、少なくとも、弾性フィラメント２１が延びる方向である一方向Ｘに収縮した状態において、図１に示すように、非伸縮性シート３が、該一方向Ｘに隣り合うシール部４，４どうし間に、該一方向Ｘに直交する直交方向Ｙに延びる凸条部３１を形成している。凸条部３１は、それぞれ前記直交方向Ｙに延びており、前記一方向Ｘに隣り合う凸条部３１どうし間には、溝部３２が形成されており、溝部３２それぞれも前記直交方向Ｙに延びている。
　凸条部３１は、内部が空洞であることが好ましいが、内部が凸条部３１の表面層の繊維密度に比して明確に密度が低い状態、例えば表面層の繊維密度に比して１／５以下の繊維密度の状態に繊維が存在する空間となっていても良い。 In the stretchable composite sheet 1 according to the present invention, as shown in FIG. 1, the non-stretchable sheet 3 is adjacent to the stretchable composite sheet 1 in the one direction X in which the elastic filaments 21 extend. A ridge portion 31 extending in an orthogonal direction Y, which is orthogonal to the one direction X, is formed between the seal portions 4 and 4 which are aligned with each other. Each of the ridges 31 extends in the orthogonal direction Y, and a groove 32 is formed between the ridges 31 adjacent to each other in the one direction X, and each groove 32 also extends in the orthogonal direction Y. ing.
It is preferable that the inside of the ridge portion 31 is hollow, but the inside is in a state where the density is clearly lower than the fiber density of the surface layer of the ridge portion 31, for example, 1 compared to the fiber density of the surface layer. It may be a space where fibers exist in a state of a fiber density of /5 or less.
　伸縮性複合シート１は、柔軟性の観点から、その全体の坪量が、好ましくは１５ｇ／ｍ２以上、より好ましくは２０ｇ／ｍ２以上、更に好ましくは３０ｇ／ｍ２以上、より更に好ましくは４０ｇ／ｍ２以上であり、また好ましくは１００ｇ／ｍ２以下、より好ましくは８０ｇ／ｍ２以下、更に好ましくは７０ｇ／ｍ２以下、より更に好ましくは６０ｇ／ｍ２以であり、また好ましくは１５ｇ／ｍ２以上１００ｇ／ｍ２以下、より好ましくは２０ｇ／ｍ２以上８０ｇ／ｍ２以下、更に好ましくは３０ｇ／ｍ２以上７０ｇ／ｍ２以下、より更に好ましくは４０ｇ／ｍ２以上６０ｇ／ｍ２以下である。
　伸縮性複合シート１は、肌の滑りやすさの観点及びシートの柔軟性の観点から、弾性フィラメント２１が延びる方向である前記一方向Ｘにおける凸条部３１の頂部間の距離Ｌ３（図３参照）が、好ましくは０．５ｍｍ以上、より好ましくは１ｍｍ以上であり、更に好ましくは２ｍｍ以上、より更に好ましくは３ｍｍ以上であり、また好ましくは１０ｍｍ以下、より好ましくは８ｍｍ以下であり、更に好ましくは６ｍｍ以下、より更に好ましくは５ｍｍ以下であり、また好ましくは０．５ｍｍ以上１０ｍｍ以下、より好ましくは１ｍｍ以上８ｍｍ以下、更に好ましくは２ｍｍ以上６ｍｍ以下、より更に好ましくは３ｍｍ以上５ｍｍ以下である。 From the viewpoint of flexibility, the stretchable composite sheet 1 has an overall basis weight of preferably 15 g/m 2 or more, more preferably 20 g/m 2 or more, still more preferably 30 g/m 2 or more, even more preferably. and at 40 g / m 2 or more, and preferably 100 g / m 2 or less, more preferably 80 g / m 2 or less, more preferably 70 g / m 2 or less, even more preferably from 60 g / m 2 or more, and preferably 15 g / m 2 or more 100 g / m 2 or less, more preferably 20 g / m 2 or more 80 g / m 2 or less, more preferably 30 g / m 2 or more 70 g / m 2 or less, even more preferably 40 g / m 2 or more 60 g / It is m 2 or less.
The stretchable composite sheet 1 has a distance L3 between the tops of the ridges 31 in the one direction X, which is the direction in which the elastic filaments 21 extend, from the viewpoint of slipperiness of the skin and flexibility of the sheet (see FIG. 3). ) Is preferably 0.5 mm or more, more preferably 1 mm or more, further preferably 2 mm or more, still more preferably 3 mm or more, and preferably 10 mm or less, more preferably 8 mm or less, and further preferably It is 6 mm or less, more preferably 5 mm or less, preferably 0.5 mm or more and 10 mm or less, more preferably 1 mm or more and 8 mm or less, still more preferably 2 mm or more and 6 mm or less, still more preferably 3 mm or more and 5 mm or less.
　伸縮性複合シート１は、肌の滑りやすさの観点及びシートの柔軟性の観点から、凸条部３１を有する部分の厚みＴ３（図３参照）が、凸条部３１間の溝部３２部分の厚みＴ４に比して、好ましくは２倍以上、より好ましくは４倍以上、更に好ましくは１０倍以上であり、また好ましくは１２０倍以下、より好ましくは１００倍以下、更に好ましくは８０倍以下、より更に好ましくは６０倍以下であり、また好ましくは２倍以上１２０倍以下、より好ましくは４倍以上１００倍以下、更に好ましくは１０倍以上８０倍以下、より更に好ましくは１０倍以上６０倍以下である。
　また伸縮性複合シート１は、肌の滑りやすさの観点及びシートの柔軟性の観点から、凸条部３１を有する部分の厚みＴ３（図３参照）が、好ましくは０．１ｍｍ以上、より好ましくは０．２ｍｍ以上、更に好ましくは０．５ｍｍ以上、より更に好ましくは１ｍｍ以上であり、また好ましくは６ｍｍ以下、より好ましくは５ｍｍ以下、更に好ましくは４ｍｍ以下、より更に好ましくは３ｍｍ以下であり、また好ましくは０．１ｍｍ以上６ｍｍ以下、より好ましくは０．２ｍｍ以上５ｍｍ以下、更に好ましくは０．５ｍｍ以上４ｍｍ以下、より更に好ましくは１ｍｍ以上３ｍｍ以下である。
　前記厚みＴ３は、張力を加えることなく自然にさせた状態の伸縮性複合シート１を、０．５ｃＮ／ｃｍ２の荷重にて平板間に挟み、平板間の距離を測ることで測定する。前記長さＬ３及び前記厚みＴ４は、前記平板間に挟んだ状態の端部を、マイクロスコープ等で拡大して測定する。凸条部３１間の溝部３２部分の厚みＴ４は、凸条部３１間の溝部３２部分の中央位置で且つシール部４が存在しない部位の厚みを測定する。 In the stretchable composite sheet 1, from the viewpoint of slipperiness of the skin and the flexibility of the sheet, the thickness T3 (see FIG. 3) of the portion having the ridges 31 is equal to that of the groove portion 32 between the ridges 31. The thickness T4 is preferably 2 times or more, more preferably 4 times or more, further preferably 10 times or more, preferably 120 times or less, more preferably 100 times or less, further preferably 80 times or less, It is more preferably 60 times or less, preferably 2 times or more and 120 times or less, more preferably 4 times or more and 100 times or less, still more preferably 10 times or more and 80 times or less, still more preferably 10 times or more and 60 times or less. Is.
Further, in the stretchable composite sheet 1, from the viewpoint of slipperiness of the skin and the flexibility of the sheet, the thickness T3 (see FIG. 3) of the portion having the ridge portion 31 is preferably 0.1 mm or more, more preferably Is 0.2 mm or more, more preferably 0.5 mm or more, still more preferably 1 mm or more, and preferably 6 mm or less, more preferably 5 mm or less, still more preferably 4 mm or less, still more preferably 3 mm or less, Further, it is preferably 0.1 mm or more and 6 mm or less, more preferably 0.2 mm or more and 5 mm or less, still more preferably 0.5 mm or more and 4 mm or less, still more preferably 1 mm or more and 3 mm or less.
The thickness T3 is measured by sandwiching the stretchable composite sheet 1 in a natural state without applying tension with a load of 0.5 cN/cm 2 between the flat plates and measuring the distance between the flat plates. The length L3 and the thickness T4 are measured by enlarging the ends sandwiched between the flat plates with a microscope or the like. The thickness T4 of the groove portion 32 portion between the ridge portions 31 is measured at the center position of the groove portion 32 portion between the ridge portions 31 and where the seal portion 4 does not exist.
　図６～図８は、上述した実施形態の伸縮性複合シート１の好ましい製造方法を示す図である。以下、図６～図８を参酌して、本発明の伸縮性複合シートの製造方法の一実施態様である、上述した実施形態の伸縮性複合シート１の好ましい製造方法について説明する。 6 to 8 are diagrams showing a preferred method of manufacturing the stretchable composite sheet 1 of the above-described embodiment. Hereinafter, with reference to FIG. 6 to FIG. 8, a preferable method for producing the elastic composite sheet 1 of the above-described embodiment, which is one embodiment of the method for producing the elastic composite sheet of the present invention, will be described.
　図６～図８に示す伸縮性複合シートの製造方法は、伸縮性シートの前駆体である複合材２Ａを製造する前駆体製造工程と、前記複合材２Ａに延伸加工を施して伸縮性シートを得る伸縮性発現処理工程と、伸縮性シート２と非伸縮性シート３とを部分的に接合して伸縮性複合シートを得るシートシール工程とを具備する。 The method of manufacturing a stretchable composite sheet shown in FIGS. 6 to 8 includes a precursor manufacturing step of manufacturing a composite material 2A which is a precursor of a stretchable sheet, and a stretchable sheet obtained by subjecting the composite material 2A to a stretching process. The method includes a step of obtaining stretchability and a sheet sealing step of partially joining the stretchable sheet 2 and the non-stretchable sheet 3 to obtain a stretchable composite sheet.
　より具体的に説明すると、前記前駆体製造工程においては、図６に示すように、複数本の弾性フィラメント２１を、一方向に延びるように、かつ実質的に非伸長状態下に、シート材２０，２０に接合して、伸縮性シートの前駆体である複合材２Ａを得る。より具体的には、紡糸ノズル１６から紡出された溶融状態の多数の弾性フィラメント２１を所定速度で引き取って延伸しつつ、該弾性フィラメント２１の固化前に、該弾性フィラメント２１が互いに交差せず一方向に配列するように該弾性フィラメント２１を、繊維材料を含むシート、好ましくは不織布からなる２枚のシート材２０，２０に溶着させる。これにより、複数の弾性フィラメント２１が、実質的に非伸長状態で、それらの全長にわたってシート材２０，２０に接合されている、伸縮性シートの前駆体としての複合材２Ａを製造する。 More specifically, in the precursor manufacturing step, as shown in FIG. 6, a plurality of elastic filaments 21 are stretched in one direction, and in a substantially non-stretched state, the sheet material 20 is formed. , 20 to obtain a composite material 2A which is a precursor of the stretchable sheet. More specifically, while drawing a large number of molten elastic filaments 21 spun from the spinning nozzle 16 at a predetermined speed and stretching, the elastic filaments 21 do not cross each other before solidification of the elastic filaments 21. The elastic filaments 21 are welded to a sheet containing a fibrous material, preferably two sheet materials 20 made of non-woven fabric so as to be arranged in one direction. Thereby, the plurality of elastic filaments 21 are bonded to the sheet materials 20 and 20 over their entire length in a substantially non-stretched state to manufacture the composite material 2A as a precursor of the elastic sheet.
　図６に示す紡糸ノズル１６は、紡糸ヘッド１７に設けられ、紡糸ヘッド１７は、押出機に接続されている。ギアポンプを介して紡糸ヘッド１７へ樹脂を供給することもできる。押出機によって溶融混練された弾性樹脂は、紡糸ヘッド１７に供給される。紡糸ヘッド１７には、多数の紡糸ノズル１６が直線状に一列に配置されている。紡糸ノズル１６は、２枚のシート材２０，２０の幅方向に沿って配置されている。紡出された溶融状態の弾性フィラメント２１は、それぞれ原反から同速度で繰り出された２枚のシート材２０，２０と合流し、両シート材２０，２０間に挟持されて所定速度で引き取られる。弾性フィラメント２１の引き取り速度は、両シート材２０，２０の繰り出し速度と一致している。弾性フィラメント２１の引き取り速度は、紡糸ノズル孔内の樹脂吐出速度に対し、その延伸倍率が１．１～４００倍、好ましくは４～１００倍、更に好ましくは１０～８０倍となるように調整されることが好ましい。 The spinning nozzle 16 shown in FIG. 6 is provided in the spinning head 17, and the spinning head 17 is connected to the extruder. The resin can also be supplied to the spinning head 17 via a gear pump. The elastic resin melt-kneaded by the extruder is supplied to the spinning head 17. The spinning head 17 has a large number of spinning nozzles 16 linearly arranged in a line. The spinning nozzle 16 is arranged along the width direction of the two sheet materials 20, 20. The spun melted elastic filaments 21 merge with the two sheet materials 20 and 20 which are respectively fed at the same speed from the original fabric, and are sandwiched between the two sheet materials 20 and 20 and taken at a predetermined speed. .. The take-up speed of the elastic filament 21 matches the pay-out speed of both sheet materials 20, 20. The take-up speed of the elastic filament 21 is adjusted so that the draw ratio is 1.1 to 400 times, preferably 4 to 100 times, and more preferably 10 to 80 times the resin discharge speed in the spinning nozzle hole. Preferably.
　弾性フィラメント２１は、その固化前に、即ち溶着可能な状態で２枚のシート材２０，２０と合流する。その結果、弾性フィラメント２１は、２枚のシート材２０，２０に挟持された状態で、これらのシート材２０，２０に溶着する。つまり、溶着可能になっている弾性フィラメント２１に起因する溶融熱によってのみ、該弾性フィラメント２１と２枚のシート材２０，２０とが溶着する。その結果、得られる伸縮性シート２は、シート材２０，２０の境界面の全域に接着剤を塗布した場合に生じるような硬さが生じにくく、シートとしての柔軟性に優れたものとなる。
　弾性フィラメント２１を２枚のシート材２０，２０と合流させるときには、各弾性フィラメント２１が互いに交差せず一方向に配列するようにする。そして、弾性フィラメント２１を２枚のシート材２０，２０と合流させて両シート材２０，２０間に該弾性フィラメント２１を挟持させた状態で、これら三者を一対のニップロール１８，１８によって挟圧する。このようにして２枚のシート材２０，２０間に弾性フィラメント２１が挟持された複合材２Ａが得られる。 The elastic filament 21 joins the two sheet materials 20 and 20 before solidification, that is, in a weldable state. As a result, the elastic filament 21 is welded to the two sheet materials 20 and 20 while being sandwiched between the two sheet materials 20 and 20. That is, the elastic filament 21 and the two sheet materials 20 and 20 are welded only by the heat of fusion caused by the elastic filament 21 that can be welded. As a result, the resulting stretchable sheet 2 is less likely to have hardness as would occur when an adhesive is applied to the entire boundary surface between the sheet materials 20 and 20, and is excellent in flexibility as a sheet.
When joining the elastic filaments 21 with the two sheet materials 20, 20, the elastic filaments 21 are arranged in one direction without intersecting each other. Then, in a state where the elastic filament 21 is joined with the two sheet materials 20 and 20 and the elastic filament 21 is sandwiched between the two sheet materials 20 and 20, these three members are sandwiched by a pair of nip rolls 18 and 18. .. Thus, the composite material 2A in which the elastic filament 21 is sandwiched between the two sheet materials 20 and 20 is obtained.
　２枚のシート材２０，２０として本来的に伸長性を有しないものを用いた場合には、シート材２０を伸長可能とする伸縮性発現処理工程を施す。本実施形態における伸縮性発現処理工程においては、歯溝延伸装置２５を用いて、両シート材２０，２０に延伸処理を施す。この延伸処理は、複合材２Ａを、弾性フィラメント２１の延びる方向に沿って延伸して、両シート材２０，２０に伸長性を付与する処理である。ここでいう、伸長性の付与には、多少の伸長性を有するシート材の伸長性を大きく向上させる場合も含まれる。
　歯溝延伸装置２５の要部が図７（ｂ）に示されている。図７に示す歯溝延伸装置２５は、軸方向に延びる突条部である歯と、歯と歯との間に形成され軸方向に延びる溝とを周方向に交互に有しており、図８に示すように、互いに噛み合う一対の歯溝ロール２６，２７を備えている。歯溝延伸装置２５を用いた伸縮性発現処理工程においては、一対の歯溝ロール２６，２７間に、前駆体製造工程で得られた複合材２Ａを供給し、複合材２Ａに延伸させることで、複合材２Ａに含まれるシート材２０，２０が伸長可能となった伸縮性シート２を得る。歯溝ロール２６，２７の歯形としては、一般的なインボリュート歯形、サイクロイド歯形が用いられ、特にこれらの歯幅を細くしたものが好ましい。 When the two sheet materials 20 and 20 that do not inherently have extensibility are used, a stretch-developing treatment step that makes the sheet material 20 extensible is performed. In the stretch-developing treatment step in the present embodiment, the tooth groove stretching device 25 is used to perform stretching processing on both sheet materials 20, 20. This stretching process is a process of stretching the composite material 2A along the extending direction of the elastic filaments 21 to impart extensibility to both the sheet materials 20 and 20. Here, imparting the extensibility includes the case of greatly improving the extensibility of a sheet material having some extensibility.
The main part of the tooth space stretching device 25 is shown in FIG. 7(b). The tooth groove extension device 25 shown in FIG. 7 has teeth, which are ridges extending in the axial direction, and grooves formed between the teeth and extending in the axial direction, alternately in the circumferential direction. As shown in FIG. 8, it is provided with a pair of tooth groove rolls 26 and 27 which mesh with each other. In the elasticity developing treatment step using the tooth groove stretching device 25, the composite material 2A obtained in the precursor manufacturing step is supplied between the pair of tooth groove rolls 26 and 27 and stretched to the composite material 2A. The stretchable sheet 2 in which the sheet materials 20 and 20 included in the composite material 2A are capable of stretching is obtained. As the tooth profile of the tooth space rolls 26 and 27, a general involute tooth profile or a cycloid tooth profile is used, and it is particularly preferable that the tooth width thereof is narrow.
　図８に示すように、複合材２Ａが歯溝ロール２６，２７間を通過する際には、複合材２Ａは、歯溝ロール２６，２７の歯２６ａ，２７ａに当接する領域（Ｐ３－Ｐ２間、Ｐ１－Ｐ４間）においては、ほとんど延伸されない。これに対し、駆動ロールである歯溝ロール２７の歯２７ａの歯面によって、従動ロールである歯溝ロール２６の歯２６ａの歯面に向けて押圧される領域（Ｐ２－Ｐ１間）においては、両歯２６ａ，２７ａによって大きく延伸される。また、歯溝ロール２７の歯２７ａの先端部によって、歯溝ロール２６の歯２６ａから引き離される領域（Ｐ４－Ｐ３間）においては、前記領域（Ｐ２－Ｐ１間）程ではないが、大きく延伸される。また複合材２Ａは、歯溝ロール２６，２７の歯２６ａ，２７ａの先端部に当接する領域（Ｐ３－Ｐ２間、Ｐ１－Ｐ４間）においては、前述のとおりほとんど延伸されないが、歯２６ａ，２７ａの先端部によって、その径方向に、つまり複合材２Ａの厚み方向に片押しされるので、厚み方向に薄くなる。 As shown in FIG. 8, when the composite material 2A passes between the tooth space rolls 26 and 27, the composite material 2A contacts the teeth 26a and 27a of the tooth space rolls 26 and 27 in the area (between P3 and P2). , Between P1 and P4) is hardly stretched. On the other hand, in the region (between P2 and P1) pressed by the tooth surface of the tooth 27a of the tooth groove roll 27 which is the drive roll toward the tooth surface of the tooth 26a of the tooth groove roll 26 which is the driven roll, It is greatly stretched by the two teeth 26a, 27a. Further, in the region (between P4 and P3) separated from the tooth 26a of the tooth groove roll 26 by the tip end portion of the tooth 27a of the tooth groove roll 27, it is largely stretched, although not as much as the above region (between P2 and P1). It Further, the composite material 2A is hardly stretched as described above in the regions (between P3 and P2, between P1 and P4) in contact with the tips of the teeth 26a and 27a of the tooth groove rolls 26 and 27, but the teeth 26a and 27a are not stretched. Since the tip end of the composite material is unidirectionally pushed in the radial direction, that is, in the thickness direction of the composite material 2A, it becomes thin in the thickness direction.
　前記の延伸プロセスによって、弾性フィラメント２１と両シート材２０，２０との剥離を防止しつつ、複合材２Ａにおける両シート材２０，２０を効率的に延伸させ、伸長性を付与することができる。そして、大きく延伸される領域（Ｐ２－Ｐ１間及びＰ４－Ｐ３間）が低坪量部２３となり、ほとんど延伸されない領域（Ｐ３－Ｐ２間、Ｐ１－Ｐ４間）が高坪量部２２となる。 By the above-described stretching process, it is possible to efficiently stretch both the sheet materials 20 and 20 in the composite material 2A while imparting extensibility while preventing the elastic filament 21 and the sheet materials 20 and 20 from being separated from each other. Areas that are largely stretched (between P2-P1 and P4-P3) are low basis weight portions 23, and areas that are hardly stretched (between P3-P2 and P1-P4) are high basis weight portions 22.
　このようにして、複合材２Ａが一対の歯溝ロール２６，２７等によって部分的に延伸させることで、伸縮性シート２が得られる。図６及び図７には、複合材２Ａをロール状に巻き取ってロール状物２Ｒとした後、ロール状物２Ｒから巻き出した複合材２Ａに延伸処理を施す場合を示したが、製造した複合材２Ａを、ロール状に巻き取ることなく、歯溝ロール２６，２７を用いた歯溝延伸装置に導入しても良い。
　得られた伸縮性シート２は、図７に示すように、搬送方向ＭＤへ伸長された状態とされ、その伸長状態下に非伸縮性シート３と合流される。
　本実施形態におけるシートシール工程においては、その伸長状態の伸縮性シート２と非伸縮性シート３とが重ねられた積層シート１０に対して、伸縮性シート２と非伸縮性シート３とを部分的にシールさせるシール加工が施される。シール加工には、伸縮性シート２と非伸縮性シート３とを部分的にシールさせることができる任意の装置を用いることができ、例えば、ヒートシール装置、超音波シール装置、高周波シール装置等を用いることができる。
　また本実施形態におけるシートシール工程では、前記一方向Ｘにおいて、隣り合う高坪量部２２どうしの中心間距離Ｃに対する、隣り合うシール部４どうしの端部間距離Ａの比が、０．２以上２０以下となるように、伸縮性シート２と非伸縮性シート３とをシール部４で部分的に接合する。 In this way, the stretchable sheet 2 is obtained by partially stretching the composite material 2A with the pair of tooth groove rolls 26, 27 and the like. FIGS. 6 and 7 show a case where the composite material 2A is wound into a roll to form a roll-shaped material 2R, and then the composite material 2A unwound from the roll-shaped material 2R is subjected to a stretching treatment. The composite material 2A may be introduced into a tooth space extending device using the tooth space rolls 26 and 27 without being wound into a roll shape.
As shown in FIG. 7, the stretchable sheet 2 thus obtained is stretched in the transport direction MD, and joined with the non-stretchable sheet 3 under the stretched state.
In the sheet sealing step in the present embodiment, the stretchable sheet 2 and the non-stretchable sheet 3 are partially attached to the laminated sheet 10 in which the stretchable sheet 2 and the non-stretchable sheet 3 are stacked. Sealing process is applied to seal to. For the sealing process, any device capable of partially sealing the stretchable sheet 2 and the non-stretchable sheet 3 can be used. For example, a heat sealing device, an ultrasonic sealing device, a high frequency sealing device, or the like can be used. Can be used.
Further, in the sheet sealing step in the present embodiment, the ratio of the distance A between the ends of the adjacent seal portions 4 to the distance C between the centers of the adjacent high basis weight portions 22 in the one direction X is 0.2. The stretchable sheet 2 and the non-stretchable sheet 3 are partially joined by the seal portion 4 so that the number is 20 or less.
　伸縮性シート２は、非伸縮性シート３と接合させる際における、弾性フィラメント２１が延びる方向Ｘへの伸長倍率が、好ましくは１．１倍以上、より好ましくは１．２倍以上であり、好ましくは５倍以下、より好ましくは４．５倍以下であり、また好ましくは１．１倍以上５倍以下、より好ましくは１．２倍以上４．５倍以下である。図６に示す製造方法においては、伸縮性シート２と非伸縮性シート３とを接合させる際の、両シート２，３の搬送方向と、弾性フィラメント２１が延びる方向Ｘとが一致している。伸縮性シート２の伸長倍率は、伸長状態における長さを、伸長前の外力を加えない状態下の長さ、すなわち自然状態の長さで除して求められる。
　伸縮性シート２は、引張試験機により弾性フィラメント２１が延びる方向Ｘに引張速度３００ｍｍ／ｍｉｎで引っ張り、応力が３．０Ｎとなった時点における該方向Ｘの長さが、該伸縮性シート２の前記自然状態における該方向Ｘの長さの１．１倍以上５倍以下であることが好ましい。 The stretchable sheet 2 has an extension ratio in the direction X in which the elastic filament 21 extends in the joining with the non-stretchable sheet 3, preferably 1.1 times or more, more preferably 1.2 times or more, and preferably. Is 5 times or less, more preferably 4.5 times or less, and preferably 1.1 times or more and 5 times or less, more preferably 1.2 times or more and 4.5 times or less. In the manufacturing method shown in FIG. 6, when the stretchable sheet 2 and the non-stretchable sheet 3 are joined, the transport direction of both sheets 2 and 3 and the direction X in which the elastic filament 21 extends are the same. The stretch ratio of the stretchable sheet 2 is obtained by dividing the length in the stretched state by the length in a state where no external force before stretching is applied, that is, the length in the natural state.
The stretchable sheet 2 is pulled by a tensile tester in a direction X in which the elastic filament 21 extends at a pulling rate of 300 mm/min, and the length of the stretchable sheet 2 in the direction X at the time when the stress becomes 3.0 N. It is preferably 1.1 times or more and 5 times or less the length in the direction X in the natural state.
　図７には、超音波ホーン４２を備えた超音波シール装置４０を用いて、伸縮性シート２及び非伸縮性シート３に対して、伸縮性シート２と非伸縮性シート３との間を部分的にシールさせるシール加工を施す場合が示されている。図７に示す超音波シール装置４０は、積層シート１０の超音波ホーン４２側に向けられる超音波印加面とは反対側の面を支持する支持ロール４１を備えている。また超音波ホーン４２の先端面又は支持ロール４１の表面には、伸縮性複合シート１に形成するシール部４に対応するパターンで、シール用凸部（図示せず）が形成されており、積層シート１０を、支持ロール４１と超音波ホーン４２との間で挟んだ状態で、超音波ホーン４２により積層シート１０に超音波を印加することで、積層シート１０に、伸縮性シート２を構成するシート材２０及び非伸縮性シート３を構成するシート材の何れか一方又は双方のシート材が溶融又は軟化し、伸縮性シート２と非伸縮性シート３とがシールによって部分的に接合されたシール部４が形成される。積層シート１０における超音波ホーン４２側に向けられる超音波印加面は、伸縮性シート２により形成されていてもよいし、非伸縮性シート３により形成されていてもよいが、超音波ホーン４２の摩擦抵抗による伸縮性シート２へのダメージ、複合シート形成時の伸縮性の観点から、非伸縮性シート３により形成されていることが好ましい。図７中、符号２８及び２９は、ニップロールであり、符号３Ｒは、非伸縮性シート３を巻回したロール状物である。支持ロール４１は、回転駆動されるものでも搬送されるシートに連れ回りする従動ロールであっても良い。また支持ロール４１に代えて回転しない支持部材を用いても良い。 In FIG. 7, an ultrasonic sealing device 40 provided with an ultrasonic horn 42 is used to partially stretch the stretchable sheet 2 and the non-stretchable sheet 3 between the stretchable sheet 2 and the non-stretchable sheet 3. A case is shown in which a sealing process is performed to achieve a positive seal. The ultrasonic sealing device 40 shown in FIG. 7 includes a support roll 41 that supports the surface of the laminated sheet 10 opposite to the ultrasonic wave application surface facing the ultrasonic horn 42 side. Further, on the tip end surface of the ultrasonic horn 42 or the surface of the support roll 41, a sealing convex portion (not shown) is formed in a pattern corresponding to the sealing portion 4 formed on the stretchable composite sheet 1, and laminated. The stretchable sheet 2 is formed in the laminated sheet 10 by applying ultrasonic waves to the laminated sheet 10 with the ultrasonic horn 42 while sandwiching the sheet 10 between the support roll 41 and the ultrasonic horn 42. A seal in which one or both of the sheet materials constituting the sheet material 20 and the non-stretchable sheet 3 are melted or softened, and the stretchable sheet 2 and the non-stretchable sheet 3 are partially joined by a seal. The part 4 is formed. The ultrasonic wave application surface of the laminated sheet 10 facing the ultrasonic horn 42 side may be formed of the stretchable sheet 2 or the non-stretchable sheet 3, but the ultrasonic horn 42 of the ultrasonic horn 42 may be formed. From the viewpoint of damage to the stretchable sheet 2 due to frictional resistance and stretchability during formation of the composite sheet, it is preferable that the non-stretchable sheet 3 be used. In FIG. 7, reference numerals 28 and 29 are nip rolls, and reference numeral 3R is a roll-shaped material around which the non-stretchable sheet 3 is wound. The support roll 41 may be a roll that is driven to rotate or a driven roll that rotates along with the conveyed sheet. Instead of the support roll 41, a non-rotating support member may be used.
　図２に示すように、弾性フィラメント２１が延びる方向Ｘに直交する方向に間欠的に複数のシール部４を形成する場合は、弾性フィラメント２１が延びる方向Ｘを積層シート１０の搬送方向ＭＤとするとともに、超音波ホーン４２又は支持ロール４１として、積層シート１０の幅方向に対応する方向に、シール用凸部（図示せず）が間欠的に複数配置されたものを用いることが好ましい。また超音波ホーン４２の積層シート１０に接する面に、シール用凸部を形成する場合、弾性フィラメント２１が延びる方向Ｘを積層シート１０の搬送方向ＭＤとするとともに、積層シート１０に間欠的に超音波振動を印加し、積層シート１０の搬送方向ＭＤに間欠的にシール部４を形成することで、弾性フィラメント２１が延びる方向Ｘに間欠的にシール部４が形成された積層シート１０が得られる。シール部４は、弾性フィラメント２１が延びる方向Ｘの直交方向Ｙに連続して延びるシール部であっても良いが、図２及び図９に示す伸縮性複合シート１，１Ａのように、弾性フィラメント２１が延びる方向Ｘの直交方向Ｙに間欠的に形成されていることが、シートの柔軟性の一層の向上の観点から好ましい。 As shown in FIG. 2, when the plurality of seal portions 4 are intermittently formed in the direction orthogonal to the direction X in which the elastic filament 21 extends, the direction X in which the elastic filament 21 extends is defined as the conveyance direction MD of the laminated sheet 10. In addition, it is preferable to use, as the ultrasonic horn 42 or the support roll 41, a plurality of sealing projections (not shown) intermittently arranged in a direction corresponding to the width direction of the laminated sheet 10. Further, when forming a sealing projection on the surface of the ultrasonic horn 42 that contacts the laminated sheet 10, the direction X in which the elastic filament 21 extends is set as the transport direction MD of the laminated sheet 10, and the laminated sheet 10 is intermittently superposed. By applying sonic vibration and intermittently forming the seal portion 4 in the transport direction MD of the laminated sheet 10, the laminated sheet 10 in which the seal portion 4 is intermittently formed in the direction X in which the elastic filament 21 extends is obtained. .. The seal part 4 may be a seal part continuously extending in a direction Y orthogonal to the direction X in which the elastic filament 21 extends, but as in the stretchable composite sheets 1 and 1A shown in FIGS. It is preferable that the sheet 21 is intermittently formed in the direction Y orthogonal to the extending direction X from the viewpoint of further improving the flexibility of the sheet.
　そして、そのシール部４が形成された積層シート１０を、搬送方向ＭＤに加えていた張力から開放し、弾性フィラメント２１が延びる方向Ｘと同方向に収縮させることにより、非伸縮性シート３における、該一方向Ｘにおいてシール部４どうし間に位置する部分が伸縮性シート２から離れる方向に突出する。これにより、図１に示すような複数の凸条部３１が形成された伸縮性複合シート１が得られる。 Then, the laminated sheet 10 on which the seal portion 4 is formed is released from the tension applied in the transport direction MD, and contracted in the same direction as the direction X in which the elastic filament 21 extends, whereby the non-stretchable sheet 3 Portions located between the seal portions 4 in the one direction X project in a direction away from the elastic sheet 2. As a result, the stretchable composite sheet 1 having the plurality of ridges 31 as shown in FIG. 1 is obtained.
　伸縮性複合シート１の形成材料について説明すると、伸縮性シート２を構成するシート材２０，２０としては、それぞれ、エアスルー不織布、ヒートロール不織布、スパンレース不織布、スパンボンド不織布、メルトブローン不織布等の不織布等を用いることができる。これらの不織布は、連続フィラメント又は短繊維の不織布であり得る。シート材２０，２０は、同種のものでもよく、異種のものでもよい。ここでいう、「同種のシート材」とは、シート材の製造プロセス、シート材の構成繊維の種類、構成繊維の繊維径や長さ、シート材の厚みや坪量等がすべて同じであるシート材どうしを意味する。これらのうちの少なくとも一つが異なる場合には、「異種のシート材」である。
　伸縮性シート２を構成するシート材２０，２０は、歯溝延伸装置２５を用いた延伸加工を施した後においては、高坪量部２２と低坪量部２３とを有するものとなる。 Explaining the forming material of the stretchable composite sheet 1, as the sheet materials 20 and 20 constituting the stretchable sheet 2, nonwoven fabrics such as air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, etc., are used. Can be used. These nonwovens can be continuous filaments or short fiber nonwovens. The sheet materials 20 and 20 may be of the same kind or of different kinds. As used herein, the "same type of sheet material" is a sheet having the same manufacturing process of the sheet material, the type of the constituent fibers of the sheet material, the fiber diameter and length of the constituent fibers, the thickness and the basis weight of the sheet material, and the like. It means materials. If at least one of these is different, it is a "different sheet material".
The sheet materials 20 and 20 that form the stretchable sheet 2 have the high grammage portion 22 and the low grammage portion 23 after being subjected to the stretching process using the tooth space stretching device 25.
　非伸縮性シート３としては、伸縮性シート２を構成するシート材２０，２０として例示したシート材と同様のものを用いることができる。非伸縮性シート３も、伸縮性シート２を構成するシート材２０の一方又は双方と、同種のものでもよく、異種のものでもよい。 As the non-stretchable sheet 3, the same sheet materials as the sheet materials 20 and 20 included in the stretchable sheet 2 can be used. The non-stretchable sheet 3 may be the same or different from one or both of the sheet materials 20 constituting the stretchable sheet 2.
　非伸縮性シート３の単独状態での厚みは、好ましくは０．１ｍｍ以上、より好ましくは０．１２ｍｍ以上、更に好ましくは０．１５ｍｍ以上、より更に好ましくは０．１８ｍｍ以上であり、好ましくは１ｍｍ以下、より好ましくは０．８ｍｍ以下、更に好ましくは０．７ｍｍ以下、より更に好ましくは０．５ｍｍ以下であり、また好ましくは０．１ｍｍ以上１ｍｍ以下、より好ましくは０．１２ｍｍ以上０．８ｍｍ以下、更に好ましくは０．１５ｍｍ以上０．７ｍｍ以下、より更に好ましくは０．１８ｍｍ以上０．５ｍｍ以下である。厚みの測定は、０．５ｃＮ／ｃｍ２の荷重にて平板間に挟み、平板間の距離を測ることで求められる。 The thickness of the non-stretchable sheet 3 in a single state is preferably 0.1 mm or more, more preferably 0.12 mm or more, still more preferably 0.15 mm or more, still more preferably 0.18 mm or more, preferably 1 mm. Or less, more preferably 0.8 mm or less, still more preferably 0.7 mm or less, still more preferably 0.5 mm or less, and preferably 0.1 mm or more and 1 mm or less, more preferably 0.12 mm or more and 0.8 mm or less. , More preferably 0.15 mm or more and 0.7 mm or less, and even more preferably 0.18 mm or more and 0.5 mm or less. The thickness is measured by sandwiching the plates with a load of 0.5 cN/cm 2 and measuring the distance between the plates.
　シート材２０，２０及び非伸縮性シート３の構成繊維としては、例えば、実質的に非弾性の非弾性繊維を用いることができ、その場合、シート材２０，２０は、該非弾性繊維を主体とする伸長可能な繊維層となり得る。実質的に非弾性の非弾性繊維としては、例えば、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）、ポリエチレンテレフタレート（ＰＥＴ）やポリブチレンテレフタレート（ＰＢＴ）等のポリエステル、ポリアミド等からなる繊維等が挙げられる。構成繊維は、短繊維でも長繊維でも良く、親水性でも撥水性でも良い。また、芯鞘型又はサイド・バイ・サイド型の複合繊維、分割繊維、異形断面繊維、捲縮繊維、熱収縮繊維等を用いることもできる。これらの繊維は、１種を単独で又は２種以上を組み合わせて用いることができる。 As the constituent fibers of the sheet materials 20 and 20 and the non-stretchable sheet 3, for example, a substantially inelastic non-elastic fiber can be used. In that case, the sheet materials 20 and 20 are mainly composed of the non-elastic fiber. Can be a stretchable fiber layer. Examples of the substantially inelastic inelastic fiber include fibers made of polyester such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyamide, and the like. The constituent fibers may be short fibers or long fibers, and may be hydrophilic or water repellent. Further, core-sheath type or side-by-side type composite fibers, split fibers, modified cross-section fibers, crimped fibers, heat-shrinkable fibers and the like can also be used. These fibers may be used alone or in combination of two or more.
　シート材２０，２０及び非伸縮性シート３の構成繊維の好ましい一例として、低融点成分及び高融点成分の２成分以上からなるものが挙げられる。低融点成分及び高融点成分の２成分以上からなる複合繊維としては、芯鞘型の複合繊維が好ましく、芯が高融点ＰＥＴ、ＰＰで、鞘が低融点ＰＥＴ、ＰＰ、ＰＥのものが好ましい。 A preferable example of the constituent fibers of the sheet materials 20 and 20 and the non-stretchable sheet 3 is one composed of two or more components of a low melting point component and a high melting point component. As the composite fiber composed of two or more components of a low melting point component and a high melting point component, a core-sheath type composite fiber is preferable, and a core having a high melting point PET or PP and a sheath having a low melting point PET, PP or PE is preferable.
　弾性フィラメント２１は、例えば熱可塑性エラストマーやゴム等の弾性樹脂を原料とするものである。特に熱可塑性エラストマーを原料として用いると、通常の熱可塑性樹脂と同様に押出機を用いた溶融紡糸が可能であり、またそのようにして得られた弾性フィラメントは熱融着させやすいので、伸縮性シート２に好適である。熱可塑性エラストマーとしては、例えば、ＳＢＳ（スチレン－ブタジエン－スチレン）、ＳＩＳ（スチレン－イソプレン－スチレン）、ＳＥＢＳ（スチレン－エチレン－ブタジエン－スチレン）、ＳＥＰＳ（スチレン－エチレン－プロピレン－スチレン）等のスチレン系エラストマー、オレフィン系エラストマー（エチレン系のα－オレフィンエラストマー、エチレン・ブテン・オクテン等を共重合したプロピレン系エラストマー）、ポリエステル系エラストマー、ポリウレタン系エラストマー等が挙げられ、これらの１種を単独で又は２種以上を組み合わせて用いることができる。 The elastic filament 21 is made of an elastic resin such as a thermoplastic elastomer or rubber as a raw material. In particular, when a thermoplastic elastomer is used as a raw material, it is possible to perform melt spinning using an extruder in the same manner as a normal thermoplastic resin, and the elastic filaments thus obtained are easily heat-sealed, so that the elasticity is improved. Suitable for the sheet 2. Examples of the thermoplastic elastomer include styrene such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butadiene-styrene), SEPS (styrene-ethylene-propylene-styrene). -Based elastomers, olefin-based elastomers (ethylene-based α-olefin elastomers, propylene-based elastomers obtained by copolymerizing ethylene-butene-octene, etc.), polyester-based elastomers, polyurethane-based elastomers, etc., and one of these may be used alone or Two or more kinds can be used in combination.
　以上、本発明をその好ましい一実施形態に基づき説明したが、本発明は上述した実施形態に限定されない。例えば、図１に示す伸縮性複合シート１においては、隣り合うシール部列Ｒ４どうしで個々のシール部４の直交方向Ｙの位置が一致しているが、本発明の伸縮性複合シート及び本発明で製造する伸縮性複合シートは、個々のシール部４の直交方向Ｙの位置が異なる２又は３以上のシール部列を有するものであっても良い。例えば、図９に示す伸縮性複合シート１Ａのように、隣り合うシール部列Ｒ４どうしで個々のシール部４の直交方向Ｙの位置が半ピッチ分ずれていても良い。 Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above-described embodiment. For example, in the stretchable composite sheet 1 shown in FIG. 1, the positions of the individual seal portions 4 in the orthogonal direction Y are the same between the adjacent seal portion rows R4. The stretchable composite sheet manufactured in (2) may have two or three or more seal portion rows in which the positions of the individual seal portions 4 in the orthogonal direction Y are different. For example, as in the stretchable composite sheet 1A shown in FIG. 9, the positions in the orthogonal direction Y of the individual seal portions 4 may be shifted by a half pitch between the adjacent seal portion rows R4.
　また、本発明の伸縮性複合シート及び本発明で製造する伸縮性複合シートを、パンツ型の外装体及び該外装体の内面側に固定された吸収性本体を備えた使い捨ておむつの外装体に使用する場合、外装体の全域を、物理的に連続した一枚の伸縮性複合シートから構成しても良いし、外装体の一部を、本発明に係る伸縮性複合シートから構成しても良い。また、各種物品のヒトの肌に対向配置される面の一部を、本発明に係る伸縮性複合シートから構成する一方、他の部分を、伸縮性複合シートから延出した伸縮性シート２又は非伸縮性シート３のみから構成することもできる。 Further, the stretchable composite sheet of the present invention and the stretchable composite sheet produced by the present invention are used for an outer casing of a disposable diaper including a pant-type outer casing and an absorbent main body fixed to the inner surface side of the outer casing. In this case, the entire exterior body may be composed of one physically continuous elastic composite sheet, or a part of the exterior body may be composed of the elastic composite sheet according to the present invention. .. In addition, a part of the surface of the various articles that is arranged to face the human skin is made of the stretchable composite sheet according to the present invention, while the other part is stretched from the stretchable composite sheet. The non-stretchable sheet 3 may be used alone.
　また上述した実施形態の伸縮性複合シート１における伸縮性シート２は、２枚のシート材２０，２０に複数の弾性フィラメント２１が挟持固定されているものであったが、本発明の伸縮性複合シートを構成する伸縮性シートは、１枚のシート材２０のみに複数の弾性フィラメントを固定されているものであっても良い。その場合、伸縮性シートは、弾性フィラメントが固定されている側に非伸縮性シート３が配されていることが好ましい。
　またシール部４の平面視形状は、円形に限られず、楕円形、四角形、三角形、五角形、トランプのハート形等の他の形状とすることもできる。 Further, the stretchable sheet 2 in the stretchable composite sheet 1 of the above-described embodiment has a plurality of elastic filaments 21 sandwiched and fixed between two sheet materials 20, 20, but the stretchable composite sheet of the present invention is The elastic sheet forming the sheet may have a plurality of elastic filaments fixed to only one sheet material 20. In that case, it is preferable that the stretchable sheet has the non-stretchable sheet 3 on the side where the elastic filaments are fixed.
The shape of the seal portion 4 in plan view is not limited to a circle, but may be other shapes such as an ellipse, a quadrangle, a triangle, a pentagon, and a heart shape of a playing card.
　また上述した実施形態の伸縮性複合シート１の製造方法では、前駆体製造工程において、弾性フィラメント２１を実質的に非伸長状態下にシート材２０，２０に接合しているが、本発明の伸縮性複合シートの製造に用いる伸縮性シートは、弾性フィラメント２１が伸長状態下にシート材２０，２０に接合されていてもよい。 In the method for manufacturing the stretchable composite sheet 1 of the above-described embodiment, the elastic filament 21 is bonded to the sheet materials 20 and 20 in a substantially non-stretched state in the precursor manufacturing step. In the stretchable sheet used for manufacturing the elastic composite sheet, the elastic filaments 21 may be joined to the sheet materials 20 and 20 in an expanded state.
　上述した実施形態に関し、本発明は更に以下の伸縮性複合シート及び該伸縮性複合シートの製造方法を開示する。
＜１＞
　互いに交差せずに一方向に延びるように配列した複数の弾性フィラメントが、実質的に非伸長状態で、それらの全長にわたり、繊維材料を含み伸長可能なシート材に接合されており、前記一方向に伸縮可能な伸縮性シートと、該伸縮性シートの片面側に部分的に接合されている非伸縮性シートとを有する伸縮性複合シートであって、
　前記伸縮性複合シートの伸長状態において、
　前記伸縮性シートは、前記一方向に高坪量部及び低坪量部を交互に有し、
　前記伸縮性シートと前記非伸縮性シートとが結合したシール部が、前記一方向に間欠的に形成されており、
　前記一方向に隣り合う前記高坪量部どうしの中心間距離Ｃに対する、該一方向に隣り合う前記シール部どうしの端部間距離Ａの比（Ａ／Ｃ）が、０．２以上２０以下であり、
　前記伸縮性複合シートの収縮状態において、
　前記非伸縮性シートが、前記一方向に隣り合う前記シール部どうし間に、該一方向に直交する直交方向に延びる凸条部を形成している、伸縮性複合シート。
＜２＞
　前記一方向に隣り合う前記高坪量部どうしの中心間距離Ｃに対する、該一方向に隣り合う前記シール部どうしの端部間距離Ａの比（Ａ／Ｃ）は、１以上１５以下がより好ましく、１．５以上５．０以下が更に好ましい、前記＜１＞に記載の伸縮性複合シート。
＜３＞
　前記一方向に隣り合う前記高坪量部どうしの中心間距離Ｃが、１ｍｍ以上５ｍｍ未満であり、前記一方向に隣り合う前記シール部どうしの端部間距離Ａが、１ｍｍ以上２０ｍｍ以下である、前記＜１＞又は前記＜２＞に記載の伸縮性複合シート。
＜４＞
　前記一方向に隣り合う前記高坪量部どうしの中心間距離Ｃは、好ましくは１ｍｍ以上、より好ましくは１．５ｍｍ以上、更に好ましくは１．７ｍｍ以上、より更に好ましくは２ｍｍ以上であり、好ましくは５ｍｍ以下、より好ましくは４ｍｍ以下、更に好ましくは３．５ｍｍ以下、より更に好ましくは３ｍｍ以下であり、より好ましくは１．５ｍｍ以上４ｍｍ以下、更に好ましくは１．７ｍｍ以上３．５ｍｍ以下、より更に好ましくは２ｍｍ以上３ｍｍ以下である、前記＜１＞～前記＜３＞の何れか１に記載の伸縮性複合シート。
＜５＞
　該一方向に隣り合う前記シール部どうしの端部間距離Ａは、好ましくは１ｍｍ以上、より好ましくは１．５ｍｍ以上、更に好ましくは２ｍｍ以上、より更に好ましくは３ｍｍ以上であり、好ましくは２０ｍｍ以下、より好ましくは１５ｍｍ以下、更に好ましくは１０ｍｍ以下、より更に好ましくは５ｍｍ以下であり、より好ましくは１．５ｍｍ以上１５ｍｍ以下、更に好ましくは２ｍｍ以上１０ｍｍ以下、より更に好ましくは３ｍｍ以上５ｍｍ以下である、前記＜１＞～前記＜４＞の何れか１に記載の伸縮性複合シート。
＜６＞
　前記シール部が、前記直交方向に間欠的に形成されており、
　前記直交方向において隣り合う前記弾性フィラメントどうしの中心間距離Ｅに対する、該直交方向に隣り合う前記シール部どうしの端部間距離Ｂの比（Ｂ／Ｅ）が、０．１以上１００以下である、前記＜１＞～前記＜５＞の何れか１に記載の伸縮性複合シート。
＜７＞
　前記直交方向において隣り合う前記弾性フィラメントどうしの中心間距離Ｅに対する、該直交方向に隣り合う前記シール部どうしの端部間距離Ｂの比（Ｂ／Ｅ）は、好ましくは０．１以上、より好ましくは０．２以上、更に好ましくは０．３以上であり、好ましくは１００以下、より好ましくは８０以下、更に好ましくは５０以下であり、より好ましくは０．２以上８０以下、更に好ましくは０．３以上５０以下である、前記＜１＞～前記＜６＞の何れか１に記載の伸縮性複合シート。
＜８＞
　前記直交方向において隣り合う前記弾性フィラメントどうしの中心間距離Ｅが、０．１ｍｍ以上１０ｍｍ未満である、前記＜１＞～前記＜７＞の何れか１に記載の伸縮性複合シート。
＜９＞
　前記直交方向において隣り合う前記弾性フィラメントどうしの中心間距離Ｅが、好ましくは０．１ｍｍ以上、より好ましくは０．５ｍｍ以上、更に好ましくは０．７ｍｍ以上、より更に好ましくは１ｍｍ以上であり、また好ましくは１０ｍｍ未満、より好ましくは８ｍｍ以下、更に好ましくは５ｍｍ以下、より更に好ましくは２ｍｍ以下であり、より好ましくは０．５ｍｍ以上８ｍｍ以下、更に好ましくは０．７ｍｍ以上５ｍｍ以下、より更に好ましくは１ｍｍ以上２ｍｍ以下である、前記＜１＞～前記＜７＞の何れか１に記載の伸縮性複合シート。
＜１０＞
　前記シール部が、前記直交方向に間欠的に形成されており、該直交方向に隣り合うシール部どうし間それぞれに１本以上の前記弾性フィラメントが存在している、前記＜１＞～前記＜９＞の何れか１に記載の伸縮性複合シート。
＜１１＞
　前記シール部が、前記直交方向に間欠的に形成されており、該直交方向に隣り合う前記シール部どうしの端部間距離Ｂが、１ｍｍ以上１０ｍｍ以下である、前記＜１＞～前記＜１０＞の何れか１に記載の伸縮性複合シート。
＜１２＞
　前記直交方向に隣り合う前記シール部どうしの端部間距離Ｂは、好ましくは１ｍｍ以上、より好ましくは２ｍｍ以上、更に好ましくは３ｍｍ以上であり、好ましくは１０ｍｍ以下、より好ましくは８ｍｍ以下、更に好ましくは５ｍｍ以下、より更に好ましくは４ｍｍ以下であり、より好ましくは２ｍｍ以上８ｍｍ以下、更に好ましくは２ｍｍ以上５ｍｍ以下、より更に好ましくは３ｍｍ以上４ｍｍ以下である、前記＜１＞～前記＜１１＞の何れか１に記載の伸縮性複合シート。
＜１３＞
　前記非伸縮性シートは、前記弾性フィラメントが延びる方向及びその直交方向の何れにおいても実質的に伸縮性を有していないことが好ましく、その表裏面と平行な方向の総ての方向において伸縮性を有しないことが好ましい、前記＜１＞～前記＜１２＞の何れか１に記載の伸縮性複合シート。
＜１４＞
　凸条部３１は、それぞれ前記直交方向に延びており、前記一方向に隣り合う凸条部どうし間には、溝部が形成されており、該溝部それぞれも前記直交方向に延びている、前記＜１＞～前記＜１３＞の何れか１に記載の伸縮性複合シート。
＜１５＞
　前記凸条部は、その内部が、該凸条部の表面層の繊維密度に比して１／５以下の繊維密度の状態に繊維が存在する空間である、前記＜１＞～前記＜１４＞の何れか１に記載の伸縮性複合シート。
＜１６＞
　前記弾性フィラメントが延びる方向である一方向において隣り合う前記低坪量部どうしの中心間距離Ｄに対する、該一方向に隣り合う前記シール部どうしの端部間距離Ａの比（Ａ／Ｄ）は、０．２以上であることがより好ましく、また２０以下であることがより好ましく、また１以上１５以下がより好ましく、１．５以上５．０以下が更に好ましい、前記＜１＞～前記＜１５＞の何れか１に記載の伸縮性複合シート。
＜１７＞
　前記＜１＞～前記＜１６＞の何れか１に記載の伸縮性複合シートの製造方法であって、
　複数本の弾性フィラメントを、一方向に延びるように、シート材に接合して、伸縮性シートの前駆体である複合材を得る前駆体製造工程と、
　軸方向に延びる突条部及び溝部を周方向に沿って交互に有し、互いに噛み合う一対の歯溝ロール間に、前記複合材を供給し、該複合材を延伸させることで、前記シート材が伸長可能となった伸縮性シートを得る伸縮性発現処理工程と、
　前記伸縮性シートを前記一方向に伸長させた状態で非伸縮性シートに積層し、前記伸縮性シート及び前記非伸縮性シートを、複数のシール部により前記一方向に間隔をあけて部分的に接合することで伸縮性複合シートを得るシートシール工程とを有し、
　前記シートシール工程では、前記一方向において、隣り合う前記高坪量部どうしの中心間距離に対する、隣り合う前記シール部どうしの端部間距離の比が０．２以上２０以下となるように、前記伸縮性シートと前記非伸縮性シートとを前記シール部で部分的に接合する、伸縮性複合シートの製造方法。
＜１８＞
　前記伸縮性発現処理工程では、前記複合材が歯溝ロール間を通過する際に、前記複合材は、駆動ロールである歯溝ロールの歯の歯面によって、従動ロールである歯溝ロールの歯の歯面に向けて押圧される領域においては、両歯によって大きく延伸される、前記＜１７＞に記載の伸縮性複合シートの製造方法。
＜１９＞
　前記シートシール工程では、前記伸縮性シートは、前記非伸縮性シートと接合させる際における、前記弾性フィラメントが延びる方向への伸長倍率が、好ましくは１．１倍以上、より好ましくは１．２倍以上であり、好ましくは５倍以下、より好ましくは４．５倍以下であり、また好ましくは１．１倍以上５倍以下、より好ましくは１．２倍以上４．５倍以下である、前記＜１７＞又は前記＜１８＞に記載の伸縮性複合シートの製造方法。 Regarding the above-described embodiment, the present invention further discloses the following elastic composite sheet and a method for producing the elastic composite sheet.
<1>
A plurality of elastic filaments arranged so as to extend in one direction without intersecting with each other are joined to a stretchable sheet material containing a fibrous material along their entire length in a substantially non-stretched state, A stretchable composite sheet having a stretchable stretchable sheet, and a non-stretchable sheet partially joined to one side of the stretchable sheet,
In the stretched state of the elastic composite sheet,
The elastic sheet has a high basis weight portion and a low basis weight portion alternately in the one direction,
A seal portion in which the stretchable sheet and the non-stretchable sheet are combined is formed intermittently in the one direction,
The ratio (A/C) of the end-to-end distance A between the seal portions adjacent in the one direction to the center-to-center distance C between the high basis weight portions adjacent in the one direction is 0.2 or more and 20 or less. And
In the contracted state of the elastic composite sheet,
The stretchable composite sheet, wherein the non-stretchable sheet forms a ridge portion extending in an orthogonal direction orthogonal to the one direction between the seal portions adjacent to each other in the one direction.
<2>
The ratio (A/C) of the end-to-end distance A between the seal parts adjacent in the one direction to the center-to-center distance C between the high basis weight parts adjacent in the one direction is preferably 1 or more and 15 or less. The stretchable composite sheet according to <1>, which is preferably 1.5 or more and 5.0 or less is more preferable.
<3>
The center-to-center distance C between the high basis weight portions adjacent to each other in the one direction is 1 mm or more and less than 5 mm, and the end-to-end distance A between the seal portions adjacent to each other in the one direction is 1 mm or more to 20 mm or less. The stretchable composite sheet according to <1> or <2> above.
<4>
The center-to-center distance C between the high basis weight portions adjacent to each other in the one direction is preferably 1 mm or more, more preferably 1.5 mm or more, still more preferably 1.7 mm or more, still more preferably 2 mm or more, and preferably Is 5 mm or less, more preferably 4 mm or less, still more preferably 3.5 mm or less, even more preferably 3 mm or less, more preferably 1.5 mm or more and 4 mm or less, still more preferably 1.7 mm or more and 3.5 mm or less. The stretchable composite sheet according to any one of the items <1> to <3>, which is more preferably 2 mm or more and 3 mm or less.
<5>
The distance A between the end portions of the seal portions adjacent to each other in the one direction is preferably 1 mm or more, more preferably 1.5 mm or more, further preferably 2 mm or more, even more preferably 3 mm or more, preferably 20 mm or less. , More preferably 15 mm or less, further preferably 10 mm or less, still more preferably 5 mm or less, more preferably 1.5 mm or more and 15 mm or less, further preferably 2 mm or more and 10 mm or less, still more preferably 3 mm or more and 5 mm or less. The stretchable composite sheet according to any one of <1> to <4>.
<6>
The seal portion is formed intermittently in the orthogonal direction,
The ratio (B/E) of the distance B between the ends of the seal portions that are adjacent to each other in the orthogonal direction to the distance E between the centers of the elastic filaments that are adjacent to each other in the orthogonal direction is 0.1 or more and 100 or less. The stretchable composite sheet according to any one of <1> to <5>.
<7>
The ratio (B/E) of the end-to-end distance B between the seal portions adjacent to each other in the orthogonal direction to the center distance E between the elastic filaments adjacent to each other in the orthogonal direction is preferably 0.1 or more, It is preferably 0.2 or more, more preferably 0.3 or more, preferably 100 or less, more preferably 80 or less, still more preferably 50 or less, more preferably 0.2 or more and 80 or less, further preferably 0. The stretchable composite sheet according to any one of the above items <1> to <6>, which is 3 or more and 50 or less.
<8>
The stretchable composite sheet according to any one of <1> to <7>, wherein a center-to-center distance E between the elastic filaments adjacent to each other in the orthogonal direction is 0.1 mm or more and less than 10 mm.
<9>
The center-to-center distance E between the elastic filaments adjacent to each other in the orthogonal direction is preferably 0.1 mm or more, more preferably 0.5 mm or more, still more preferably 0.7 mm or more, still more preferably 1 mm or more, and Preferably less than 10 mm, more preferably 8 mm or less, even more preferably 5 mm or less, even more preferably 2 mm or less, more preferably 0.5 mm or more and 8 mm or less, still more preferably 0.7 mm or more and 5 mm or less, even more preferably The stretchable composite sheet according to any one of <1> to <7>, which is 1 mm or more and 2 mm or less.
<10>
The seal portion is intermittently formed in the orthogonal direction, and one or more elastic filaments are present between the seal portions adjacent to each other in the orthogonal direction. <1> to <9>> The stretchable composite sheet according to any one of <1>.
<11>
<1> to <10, wherein the seal portion is intermittently formed in the orthogonal direction, and an end-to-end distance B between the seal portions adjacent to each other in the orthogonal direction is 1 mm or more and 10 mm or less. > The stretchable composite sheet according to any one of <1>.
<12>
The distance B between the end portions of the seal portions adjacent to each other in the orthogonal direction is preferably 1 mm or more, more preferably 2 mm or more, further preferably 3 mm or more, preferably 10 mm or less, more preferably 8 mm or less, further preferably Is 5 mm or less, more preferably 4 mm or less, more preferably 2 mm or more and 8 mm or less, still more preferably 2 mm or more and 5 mm or less, still more preferably 3 mm or more and 4 mm or less, in the above <1> to <11>. The stretchable composite sheet according to any one of items.
<13>
It is preferable that the non-stretchable sheet has substantially no stretchability in either the direction in which the elastic filament extends or the direction orthogonal thereto, and the stretchability in all directions parallel to the front and back surfaces thereof. The stretchable composite sheet according to any one of <1> to <12>, which preferably does not have
<14>
Each of the ridges 31 extends in the orthogonal direction, a groove is formed between the ridges adjacent in the one direction, and each of the grooves also extends in the orthogonal direction. 1> to the stretchable composite sheet according to any one of <13>.
<15>
<1> to <14 above, wherein the interior of the ridge is a space in which fibers are present at a fiber density of ⅕ or less of the fiber density of the surface layer of the ridge. > The stretchable composite sheet according to any one of <1>.
<16>
The ratio (A/D) of the end-to-end distance A between the seal portions adjacent to each other in the one direction, which is the direction in which the elastic filament extends, to the center-to-center distance D between the low basis weight portions adjacent to each other in the one direction. , 0.2 or more, more preferably 20 or less, more preferably 1 or more and 15 or less, still more preferably 1.5 or more and 5.0 or less, <1> to <15> The stretchable composite sheet according to any one of 15>.
<17>
The method for producing a stretchable composite sheet according to any one of <1> to <16>,
A plurality of elastic filaments, so as to extend in one direction, joined to a sheet material, a precursor manufacturing step to obtain a composite material that is a precursor of the elastic sheet,
The sheet material can be obtained by alternately supplying the composite material between a pair of tooth groove rolls meshing with each other and having axially extending ridges and grooves along the circumferential direction, and stretching the composite material. A stretch expression treatment step for obtaining a stretchable sheet that can be stretched,
The stretchable sheet is laminated on a non-stretchable sheet in a state of being stretched in the one direction, and the stretchable sheet and the non-stretchable sheet are partially separated by a plurality of sealing portions in the one direction with a space therebetween. Having a sheet sealing step of obtaining a stretchable composite sheet by joining,
In the sheet sealing step, in the one direction, a ratio of an end-to-end distance between the adjacent seal parts to a center-to-center distance between the adjacent high basis weight parts is 0.2 or more and 20 or less, A method for producing a stretchable composite sheet, wherein the stretchable sheet and the non-stretchable sheet are partially joined at the seal portion.
<18>
In the stretch-developing treatment step, when the composite material passes between the tooth groove rolls, the composite material is a tooth of the tooth groove roller that is the driven roller due to the tooth surface of the tooth groove roller that is the driving roller. The method for producing a stretchable composite sheet according to <17>, wherein the stretchable composite sheet is largely stretched by both teeth in the region pressed toward the tooth surface.
<19>
In the sheet sealing step, the stretchable sheet preferably has a stretch ratio in the extending direction of the elastic filament of 1.1 times or more, more preferably 1.2 times, when being joined to the non-stretchable sheet. Or more, preferably 5 times or less, more preferably 4.5 times or less, and preferably 1.1 times or more and 5 times or less, more preferably 1.2 times or more and 4.5 times or less, <17> or the method for producing a stretchable composite sheet according to <18>.
　以下、本発明を実施例を用いて更に詳細に説明するが、本発明は、斯かる実施例によって何ら限定されるものではない。
〔実施例１〕
　下記の伸縮性シートを伸長状態下に非伸縮性シートと重ねた積層シート１０に対して、図７に示すシール装置４０によりシートシール工程を行うことによって、伸縮性シートと非伸縮性シートとが部分的に接合された平面視円形のシール部４を有する実施例１の伸縮性複合シートを得た。 Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples.
[Example 1]
By performing a sheet sealing process with the sealing device 40 shown in FIG. 7 on the laminated sheet 10 in which the following elastic sheet is superposed with the non-elastic sheet in the stretched state, the elastic sheet and the non-elastic sheet are separated. The stretchable composite sheet of Example 1 having the partially joined circular seal portion 4 in a plan view was obtained.
＜伸縮性シート＞
　非弾性繊維から形成された２枚のスパンボンド不織布間に弾性フィラメントが狭持された構成の積層シートを、伸縮性シートの原反シートとして用い、該原反シートをフィラメントの配向方向に搬送しながら、歯溝延伸装置の一対の歯溝ロール間に供給して伸縮性シートを得た。原反シート及び伸縮性シートには、多数本の弾性フィラメントが所定の間隔で互いに平行に配されている。
　弾性フィラメント：スチレン系の熱可塑性エラストマー、繊維径１２０～１３０μｍ
　非弾性繊維：ＰＰ繊維、太さ１７μｍ
　原反シートのシート坪量：４５ｇ／ｍ２ <Stretchable sheet>
A laminated sheet having elastic filaments sandwiched between two spunbonded non-woven fabrics formed of non-elastic fibers is used as a raw sheet of a stretchable sheet, and the raw sheet is conveyed in the filament orientation direction. Meanwhile, the stretchable sheet was obtained by supplying between the pair of tooth groove rolls of the tooth groove stretching device. A large number of elastic filaments are arranged in parallel with each other at a predetermined interval on the original sheet and the elastic sheet.
Elastic filament: Styrenic thermoplastic elastomer, fiber diameter 120~130μm
Inelastic fiber: PP fiber, thickness 17 μm
Sheet basis weight of the raw sheet: 45 g/m 2
＜非伸縮性シート＞
　ＰＰ繊維から形成された、スパンボンド不織布。坪量１８ｇ／ｍ２ <Non-stretchable sheet>
Spunbond nonwoven fabric formed from PP fibers. Basis weight 18g/m 2
＜伸縮性複合シートにおけるシール部の配置＞
　製造した伸縮性複合シートにおける各部の寸法を表１に示した。
　表中の表記の意味は以下の通りである。一方向Ｘは、弾性フィラメントが延びる方向と同方向、直交方向Ｙは、弾性フィラメントが延びる方向と直交する方向である。
　格子配置　　：一方向に多列にシール部列が形成され、隣り合うシール部列どうしで個々のシール部の位置が一致する配置（図２参照）
　千鳥配置　　：一方向に多列にシール部列が形成され、隣り合うシール部列どうしで個々のシール部の位置が半ピッチ分ずれている配置（図９参照）
　シール部の直径：シール部の直径
〔標準伸長状態で測定した寸法〕
　高坪量部の中心間距離Ｃ：一方向Ｘに隣り合う高坪量部どうしの中心間距離
　シール部の端部間距離Ａ　：一方向Ｘに隣り合うシール部どうしの端部間距離
　比（Ａ／Ｃ）　　　　　：中心間距離Ｃに対する端部間距離Ａの比
　シール部の端部間距離Ｂ　：直交方向Ｙに隣り合うシール部どうしの端部間距離
　比（Ｂ／Ｃ）　　　　　：中心間距離Ｃに対する端部間距離Ｂの比
　低坪量部の中心間距離Ｄ：一方向Ｘに隣り合う低坪量部どうしの中心間距離
　弾性フィラメント間隔Ｅ：直交方向Ｙにおいて隣り合う弾性フィラメントどうしの中心間距離
〔収縮状態で測定した寸法〕
　凸条部の間隔Ｌ３　：一方向Ｘにおける凸条部３１の頂部間の距離（図３参照）
　凸条部部分厚みＴ３：凸条部３１を有する部分の厚みＴ３
　溝部部分の厚みＴ４：溝部３２を有する部分の厚みＴ４ <Arrangement of seal part in stretchable composite sheet>
Table 1 shows the dimensions of each part in the produced stretchable composite sheet.
The meanings of the notations in the table are as follows. The one direction X is the same direction as the extending direction of the elastic filaments, and the orthogonal direction Y is the direction orthogonal to the extending direction of the elastic filaments.
Lattice arrangement: An arrangement in which multiple rows of seal parts are formed in one direction, and the positions of the individual seal parts are the same between adjacent seal part rows (see Fig. 2)
Staggered arrangement: An arrangement in which multiple rows of seal parts are formed in one direction, and the positions of the individual seal parts are offset by a half pitch between adjacent seal part rows (see FIG. 9).
Diameter of seal part: Diameter of seal part [Dimension measured in standard extension state]
Distance between centers of high basis weight portions C: Distance between centers of high basis weight portions adjacent to each other in one direction X Distance between end portions of seal portion A: Distance between end portions of adjacent seal portions in one direction X Ratio ( A/C): Ratio of end-to-end distance A to center-to-center distance C End-to-end distance B of seal part: End-to-end distance between seal parts adjacent in the orthogonal direction Y Ratio (B/C): Center-to-center distance Ratio of distance between ends B to C Distance between centers of low basis weight parts D: Distance between centers of low basis weight parts adjacent in one direction X Elastic filament spacing E: Center of adjacent elastic filaments in the orthogonal direction Y Distance (dimensions measured in contracted state)
Distance L3 between ridges: Distance between tops of ridges 31 in one direction X (see FIG. 3)
Thickness T3 of ridge portion: Thickness T3 of the portion having the ridge portion 31
Thickness T4 of groove portion: Thickness T4 of portion having groove 32
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
〔実施例２～３〕
　シール装置４０により形成するシール部のパターンを変更した以外は、実施例１と同様にして各部の寸法や比を表１に示すとおりに変更された伸縮性複合シートを製造した。 [Examples 2 to 3]
Except for changing the pattern of the seal portion formed by the sealing device 40, the stretchable composite sheet was manufactured in the same manner as in Example 1 with the dimensions and ratios of each portion changed as shown in Table 1.
〔評価〕
　実施例１～３で得られた伸縮性複合シートについて、以下の方法により、１．柔らかさ、及び２．肌の滑りやすさを評価した。
１．柔らかさ
（１）方法：カトーテック株式会社製　ＫＥＳ－ＦＢ３－ＡＵＴＯ－Ａ型装置を用い、加圧面積：２ｃｍ２、圧縮速度：０．０６ｍｍ／ｓ、上限荷重：５０ｇｆ／ｃｍ２、力計：１ｋｇｆ、ＳＥＮＳ：２、ＤＥＦ　ＯＵＴ：１０、取込み間隔：中速の条件で圧縮仕事量を測定し、柔らかさを評価した。柔らかさの指標である圧縮仕事量は、その値が大きいほどふんわりとしており、風合いが良いと評価される。
（２）評価結果：結果を表１に示した。 [Evaluation]
For the stretchable composite sheets obtained in Examples 1 to 3, 1. Softness, and 2. The slipperiness of the skin was evaluated.
1. Softness (1) Method: Using KES-FB3-AUTO-A type device manufactured by Kato Tech Co., Ltd., pressurizing area: 2 cm 2 , compression rate: 0.06 mm/s, upper limit load: 50 gf/cm 2 , dynamometer The compression work was measured under the conditions of 1 kgf, SENS:2, DEF OUT:10, and uptake interval: medium speed to evaluate the softness. The larger the value of the compression work, which is an index of softness, the softer it is, and it is evaluated that the texture is good.
(2) Evaluation results: The results are shown in Table 1.
２．肌の滑りやすさ
（１）方法：各実施例のシートについて、下記方法によりＭＭＤ値（摩擦係数の平均偏差）を測定し、肌の滑りやすさを評価した。
　ＭＭＤ値は、測定対象物であるシートの肌対向面の表面粗さの指標となるもので、ＭＭＤ値が小さいほど、着用者の肌との摩擦が少なく高評価となる。従って、ＭＭＤ値の測定値から、評価対象のシートにおける肌の滑りやすさを評価し得る。
＜ＭＭＤ値の測定方法＞
　市販の測定機器（カトーテック株式会社製、ＫＥＳ－ＦＢ４表面試験機）を用い、測定対象のシートについて、スピード：０．１ｃｍ／ｓ、初期張力：４００ｇ、粗さ加圧：１０ｇｆの条件でＭＭＤ値を測定した。ＭＭＤ値は、測定対象物の表面粗さの指標となるもので、ＭＭＤ値が小さいほど、着用者の肌との摩擦が少なく高評価となる。
（２）評価結果：結果を表１に示した。 2. Skin slipperiness (1) Method: With respect to the sheet of each example, the MMD value (average deviation of friction coefficient) was measured by the following method to evaluate the skin slipperiness.
The MMD value serves as an index of the surface roughness of the skin-facing surface of the sheet that is the measurement target, and the smaller the MMD value, the less the friction with the wearer's skin and the higher the evaluation. Therefore, the slipperiness of the skin on the sheet to be evaluated can be evaluated from the measured MMD value.
<MMD value measurement method>
Using a commercially available measuring device (KES-FB4 surface tester manufactured by Kato Tech Co., Ltd.), the sheet to be measured is MMD under the conditions of speed: 0.1 cm/s, initial tension: 400 g, roughness pressurization: 10 gf. The value was measured. The MMD value serves as an index of the surface roughness of the measurement object, and the smaller the MMD value, the less the friction with the skin of the wearer and the higher the evaluation.
(2) Evaluation results: The results are shown in Table 1.
　表１、図１０（ａ）、及び図１０（ｂ）に示す結果から、比（Ａ／Ｃ）が０．２以上２０以下であると、シートとしての柔軟性及び肌の滑りやすさに優れることが判る。したがって、本発明の伸縮性複合シートは部分的なシールによって伸縮性シートが保有する伸縮性を損なわず複合化されていることが判る。 From the results shown in Table 1, FIG. 10(a), and FIG. 10(b), when the ratio (A/C) is 0.2 or more and 20 or less, the flexibility as a sheet and the slipperiness of the skin are excellent. I understand. Therefore, it is understood that the stretchable composite sheet of the present invention is made into a composite by a partial seal without impairing the stretchability of the stretchable sheet.
〔実施例４〕
　シール装置４０により形成するシール部のパターンを以下のように変更した以外は、実施例１と同様にして伸縮性複合シートを製造した。
　シール部の端部間距離Ａ：１．５ｍｍ
　シール部の端部間距離Ｂ：３．５ｍｍ [Example 4]
A stretchable composite sheet was produced in the same manner as in Example 1 except that the pattern of the seal portion formed by the seal device 40 was changed as follows.
Distance between ends of seal part A: 1.5 mm
Distance between ends of seal part B: 3.5 mm
〔実施例５〕
　シール装置４０により形成するシール部のパターンを以下のように変更した以外は、実施例１と同様にして伸縮性複合シートを製造した。
　シール部の端部間距離Ａ：１．５ｍｍ
　シール部の端部間距離Ｂ：１０．０ｍｍ [Example 5]
A stretchable composite sheet was produced in the same manner as in Example 1 except that the pattern of the seal portion formed by the seal device 40 was changed as follows.
Distance between ends of seal part A: 1.5 mm
Distance B between seal ends: 10.0 mm
〔評価〕
　実施例１～５で得られた伸縮性複合シートについて、以下の方法により、３．伸長率を評価した。
３．伸長率
（１）方法：実施例１～５で得られた伸縮性複合シートから、幅方向に含まれるシール部の数が同じになるように、幅５０ｍｍ、長さ１００ｍｍ超の矩形状の試験片を切り出した。該試験片を、引張試験機(テンシロン(登録商標)：株式会社オリエンテック製：型式：ＡＧ-１/５０Ｎ-１０ｋＮ)に、チャック間距離１００ｍｍ、初期張力０．０１～０．０５Ｎとなるようにセットした。試験片を引張速度３００ｍｍ／ｍｉｎで引っ張り、応力が３．０Ｎになった時のチャック間距離を測定した。応力が３．０Ｎになったときのチャック間距離を、引張前のチャック間距離（１００ｍｍ）で除した値を伸長率とした。
（２）評価結果：結果を図１１に示した。 [Evaluation]
2. With respect to the stretchable composite sheets obtained in Examples 1 to 5, 3. The elongation rate was evaluated.
3. Elongation rate (1) Method: A rectangular test with a width of 50 mm and a length of more than 100 mm from the stretchable composite sheets obtained in Examples 1 to 5 so that the number of seal portions included in the width direction is the same. I cut out a piece. The test piece was placed in a tensile tester (Tensilon (registered trademark): manufactured by Orientec Co., Ltd.: model: AG-1/50N-10kN) so that the chuck distance was 100 mm and the initial tension was 0.01 to 0.05N. Set to. The test piece was pulled at a pulling speed of 300 mm/min, and the distance between chucks when the stress reached 3.0 N was measured. The value obtained by dividing the distance between chucks when the stress reached 3.0 N by the distance between chucks before pulling (100 mm) was defined as the elongation rate.
(2) Evaluation results: The results are shown in FIG.
　図１１（ａ）に示す結果から、シール部の端部間距離Ａが長くなると、伸長率が大きくなり、伸びやすいことが判る。また図１１（ｂ）に示す結果から、シール部の端部間距離Ｂが長くなると、伸長率が大きくなり、伸びやすいことが判る。 From the results shown in FIG. 11(a), it can be seen that when the distance A between the end portions of the seal portion becomes long, the extension rate becomes large and the extension easily occurs. Further, from the results shown in FIG. 11B, it is understood that when the distance B between the end portions of the seal portion is increased, the extension rate is increased and the extension is likely to occur.
　本発明の伸縮性複合シートは、シートとしての柔軟性及び肌の滑りやすさの点で優れている。本発明の伸縮性複合シートの製造方法によれば、そのような伸縮性複合シートを効率的に製造することができる。
  The stretchable composite sheet of the present invention is excellent in sheet flexibility and skin slipperiness. According to the method for producing a stretchable composite sheet of the present invention, such a stretchable composite sheet can be efficiently produced.

Claims (25)

  1. 　互いに交差せずに一方向に延びるように配列した複数の弾性フィラメントが、実質的に非伸長状態で、それらの全長にわたり、繊維材料を含み伸長可能なシート材に接合されており、前記一方向に伸縮可能な伸縮性シートと、該伸縮性シートの片面側に部分的に接合されている非伸縮性シートとを有する伸縮性複合シートであって、
    　前記伸縮性複合シートの伸長状態において、
    　前記伸縮性シートは、前記一方向に高坪量部及び低坪量部を交互に有し、
    　前記伸縮性シートと前記非伸縮性シートとが結合したシール部が、前記一方向に間欠的に形成されており、
    　前記一方向に隣り合う前記高坪量部どうしの中心間距離Ｃに対する、該一方向に隣り合う前記シール部どうしの端部間距離Ａの比（Ａ／Ｃ）が、０．２以上２０以下であり、
    　前記伸縮性複合シートの収縮状態において、
    　前記非伸縮性シートが、前記一方向に隣り合う前記シール部どうし間に、該一方向に直交する直交方向に延びる凸条部を形成している、伸縮性複合シート。     A plurality of elastic filaments arranged so as to extend in one direction without intersecting with each other are joined to a stretchable sheet material containing a fibrous material along their entire length in a substantially non-stretched state, A stretchable composite sheet having a stretchable stretchable sheet, and a non-stretchable sheet partially joined to one side of the stretchable sheet,
    In the stretched state of the elastic composite sheet,
    The elastic sheet has a high basis weight portion and a low basis weight portion alternately in the one direction,
    A seal portion in which the stretchable sheet and the non-stretchable sheet are combined is formed intermittently in the one direction,
    The ratio (A/C) of the end-to-end distance A between the seal portions adjacent in the one direction to the center-to-center distance C between the high basis weight portions adjacent in the one direction is 0.2 or more and 20 or less. And
    In the contracted state of the elastic composite sheet,
    The stretchable composite sheet, wherein the non-stretchable sheet forms a ridge portion extending in an orthogonal direction orthogonal to the one direction between the seal portions adjacent to each other in the one direction.
  2. 　前記一方向に隣り合う前記高坪量部どうしの中心間距離Ｃに対する、該一方向に隣り合う前記シール部どうしの端部間距離Ａの比（Ａ／Ｃ）が、１以上１５以下である、請求項１に記載の伸縮性複合シート。 The ratio (A/C) of the end-to-end distance A between the seal portions adjacent in the one direction to the center-to-center distance C between the high basis weight portions adjacent in the one direction is 1 or more and 15 or less. The stretchable composite sheet according to claim 1.
  3. 　前記一方向に隣り合う前記高坪量部どうしの中心間距離Ｃが、１ｍｍ以上５ｍｍ未満であり、前記一方向に隣り合う前記シール部どうしの端部間距離Ａが、１ｍｍ以上２０ｍｍ以下である、請求項１又は２に記載の伸縮性複合シート。 The center-to-center distance C between the high basis weight portions adjacent to each other in the one direction is 1 mm or more and less than 5 mm, and the end-to-end distance A between the seal portions adjacent to each other in the one direction is 1 mm or more to 20 mm or less. The stretchable composite sheet according to claim 1 or 2.
  4. 　前記一方向に隣り合う前記高坪量部どうしの中心間距離Ｃが、１．５ｍｍ以上４ｍｍ以下である、請求項１～３の何れか１項に記載の伸縮性複合シート。 The stretchable composite sheet according to any one of claims 1 to 3, wherein a center-to-center distance C between the high basis weight portions adjacent to each other in the one direction is 1.5 mm or more and 4 mm or less.
  5. 　前記一方向に隣り合う前記シール部どうしの端部間距離Ａが、１．５ｍｍ以上１５ｍｍ以下である、請求項１～４の何れか１項に記載の伸縮性複合シート。 The stretchable composite sheet according to any one of claims 1 to 4, wherein an end-to-end distance A between the seal portions adjacent to each other in the one direction is 1.5 mm or more and 15 mm or less.
  6. 　前記シール部が、前記直交方向に間欠的に形成されており、
    　前記直交方向において隣り合う前記弾性フィラメントどうしの中心間距離Ｅに対する、該直交方向に隣り合う前記シール部どうしの端部間距離Ｂの比（Ｂ／Ｅ）が、０．１以上１００以下である、請求項１～５の何れか１項に記載の伸縮性複合シート。     The seal portion is formed intermittently in the orthogonal direction,
    The ratio (B/E) of the distance B between the ends of the seal portions that are adjacent to each other in the orthogonal direction to the distance E between the centers of the elastic filaments that are adjacent to each other in the orthogonal direction is 0.1 or more and 100 or less. The stretchable composite sheet according to any one of claims 1 to 5.
  7. 　前記シール部が、前記直交方向に間欠的に形成されており、
    　前記直交方向において隣り合う前記弾性フィラメントどうしの中心間距離Ｅに対する、該直交方向に隣り合う前記シール部どうしの端部間距離Ｂの比（Ｂ／Ｅ）が、０．２以上８０以下である、請求項１～６の何れか１項に記載の伸縮性複合シート。     The seal portion is formed intermittently in the orthogonal direction,
    The ratio (B/E) of the distance B between the ends of the seal portions adjacent to each other in the orthogonal direction to the center distance E of the elastic filaments adjacent to each other in the orthogonal direction is 0.2 or more and 80 or less. The stretchable composite sheet according to any one of claims 1 to 6.
  8. 　前記直交方向において隣り合う前記弾性フィラメントどうしの中心間距離Ｅが、０．１ｍｍ以上１０ｍｍ未満である、請求項１～７の何れか１項に記載の伸縮性複合シート。 The stretchable composite sheet according to any one of claims 1 to 7, wherein a center-to-center distance E between adjacent elastic filaments in the orthogonal direction is 0.1 mm or more and less than 10 mm.
  9. 　前記直交方向において隣り合う前記弾性フィラメントどうしの中心間距離Ｅが、０．５ｍｍ以上８ｍｍ以下である、請求項１～８の何れか１項に記載の伸縮性複合シート。 The stretchable composite sheet according to any one of claims 1 to 8, wherein a center-to-center distance E between the elastic filaments adjacent to each other in the orthogonal direction is 0.5 mm or more and 8 mm or less.
  10. 　前記シール部が、前記直交方向に間欠的に形成されており、該直交方向に隣り合うシール部どうし間それぞれに１本以上の前記弾性フィラメントが存在している、請求項１～９の何れか１項に記載の伸縮性複合シート。 10. The seal portion is formed intermittently in the orthogonal direction, and one or more elastic filaments are present between the seal portions adjacent in the orthogonal direction, respectively. The stretchable composite sheet according to item 1.
  11. 　前記シール部が、前記直交方向に間欠的に形成されており、該直交方向に隣り合う前記シール部どうしの端部間距離Ｂが、１ｍｍ以上１０ｍｍ以下である、請求項１～１０の何れか１項に記載の伸縮性複合シート。 11. The seal portion is intermittently formed in the orthogonal direction, and an end-to-end distance B between the seal portions adjacent to each other in the orthogonal direction is 1 mm or more and 10 mm or less. The stretchable composite sheet according to item 1.
  12. 　前記直交方向に隣り合う前記シール部どうしの端部間距離Ｂが、２ｍｍ以上８ｍｍ以下である、請求項１～１１の何れか１項に記載の伸縮性複合シート。 The stretchable composite sheet according to any one of claims 1 to 11, wherein an end-to-end distance B between the seal portions adjacent to each other in the orthogonal direction is 2 mm or more and 8 mm or less.
  13. 　前記非伸縮性シートは、前記弾性フィラメントが延びる方向及びその直交方向の何れにおいても実質的に伸縮性を有しておらず、該非伸縮性シートの表裏面と平行な方向の総ての方向において伸縮性を有していない、請求項１～１２の何れか１項に記載の伸縮性複合シート。 The non-stretchable sheet has substantially no stretchability in any of the direction in which the elastic filament extends and the direction orthogonal thereto, and in all directions parallel to the front and back surfaces of the non-stretchable sheet. The stretchable composite sheet according to any one of claims 1 to 12, which does not have stretchability.
  14. 　前記凸条部は、それぞれ前記直交方向に延びており、前記一方向に隣り合う凸条部どうし間には、溝部が形成されており、該溝部それぞれも前記直交方向に延びている、請求項１～１３の何れか１項に記載の伸縮性複合シート。 The ridges each extend in the orthogonal direction, a groove is formed between the ridges adjacent in the one direction, and each groove also extends in the orthogonal direction. The stretchable composite sheet according to any one of 1 to 13.
  15. 　前記凸条部は、その内部が、該凸条部の表面層の繊維密度に比して１／５以下の繊維密度の状態に繊維が存在する空間である、請求項１～１４の何れか１項に記載の伸縮性複合シート。 15. The interior of the ridge portion is a space in which fibers are present in a state where the fiber density is 1/5 or less of the fiber density of the surface layer of the ridge portion. The stretchable composite sheet according to item 1.
  16. 　前記弾性フィラメントが延びる方向である一方向において隣り合う前記低坪量部どうしの中心間距離Ｄに対する、該一方向に隣り合う前記シール部どうしの端部間距離Ａの比（Ａ／Ｄ）が、０．２以上２０以下である、請求項１～１５の何れか１項に記載の伸縮性複合シート。 A ratio (A/D) of the end-to-end distance A between the seal portions adjacent to each other in the one direction, which is the direction in which the elastic filament extends, to the center-to-center distance D between the low grammage portions adjacent to each other in the one direction. The stretchable composite sheet according to any one of claims 1 to 15, which is 0.2 or more and 20 or less.
  17. 　請求項１～１６の何れか１項に記載の伸縮性複合シートの製造方法であって、
    　複数本の弾性フィラメントを、一方向に延びるように、シート材に接合して、伸縮性シートの前駆体である複合材を得る前駆体製造工程と、
    　軸方向に延びる突条部及び溝部を周方向に沿って交互に有し、互いに噛み合う一対の歯溝ロール間に、前記複合材を供給し、該複合材を延伸させることで、前記シート材が伸長可能となった伸縮性シートを得る伸縮性発現処理工程と、
    　前記伸縮性シートを前記一方向に伸長させた状態で非伸縮性シートに積層し、前記伸縮性シート及び前記非伸縮性シートを、複数のシール部により前記一方向に間隔をあけて部分的に接合することで伸縮性複合シートを得るシートシール工程とを有し、
    　前記シートシール工程では、前記一方向において、隣り合う前記高坪量部どうしの中心間距離に対する、隣り合う前記シール部どうしの端部間距離の比が０．２以上２０以下となるように、前記伸縮性シートと前記非伸縮性シートとを前記シール部で部分的に接合する、伸縮性複合シートの製造方法。     A method for producing the stretchable composite sheet according to any one of claims 1 to 16,
    A plurality of elastic filaments, so as to extend in one direction, joined to a sheet material, a precursor manufacturing step to obtain a composite material that is a precursor of the elastic sheet,
    By alternately having axially extending ridges and grooves along the circumferential direction, between a pair of tooth groove rolls meshing with each other, by supplying the composite material and stretching the composite material, the sheet material is A stretch expression treatment step for obtaining a stretchable sheet that can be stretched,
    The stretchable sheet is laminated on a non-stretchable sheet in a state of being stretched in the one direction, and the stretchable sheet and the non-stretchable sheet are partially separated by a plurality of seal portions in the one direction with a space therebetween. Having a sheet sealing step of obtaining a stretchable composite sheet by joining,
    In the sheet sealing step, in the one direction, the ratio of the distance between the ends of the adjacent seal portions to the distance between the centers of the adjacent high basis weight portions is 0.2 or more and 20 or less, A method for producing a stretchable composite sheet, wherein the stretchable sheet and the non-stretchable sheet are partially joined at the seal portion.
  18. 　前記一対の歯溝ロールの一方が駆動ロール、他方が従動ロールであり、
    　前記伸縮性発現処理工程では、前記複合材が前記一対の歯溝ロール間を通過する際に、該複合材は、前記駆動ロールの歯の歯面によって、前記従動ロールの歯の歯面に向けて押圧される領域においては、両歯によって大きく延伸される、請求項１７に記載の伸縮性複合シートの製造方法。     One of the pair of tooth groove rolls is a drive roll, the other is a driven roll,
    In the elasticity developing treatment step, when the composite material passes between the pair of tooth groove rolls, the composite material is directed toward the tooth surfaces of the driven roll teeth by the tooth surfaces of the drive roll teeth. The method for manufacturing a stretchable composite sheet according to claim 17, wherein in the region pressed by the two teeth, the stretchable composite sheet is largely stretched.
  19. 　前記シートシール工程では、前記伸縮性シートは、前記非伸縮性シートと接合させる際における、前記弾性フィラメントが延びる方向への伸長倍率が、１．１倍以上５倍以下である、請求項１７又は１８に記載の伸縮性複合シートの製造方法。 In the sheet sealing step, when the elastic sheet is joined to the non-stretchable sheet, an expansion ratio in a direction in which the elastic filament extends is 1.1 times or more and 5 times or less. 18. The method for producing a stretchable composite sheet according to item 18.
  20. 　前記シートシール工程では、超音波ホーンを備えた超音波シール装置を用いて、前記伸縮性シートと前記非伸縮性シートとが重ねられた積層シートに対して、該伸縮性シートと該非伸縮性シートとの間を部分的にシールさせるシール加工を施す、請求項１７～１９の何れか１項に記載の伸縮性複合シートの製造方法。 In the sheet sealing step, the stretchable sheet and the non-stretchable sheet are used for a laminated sheet in which the stretchable sheet and the non-stretchable sheet are stacked using an ultrasonic sealing device including an ultrasonic horn. The method for producing a stretchable composite sheet according to any one of claims 17 to 19, wherein a sealing process is performed to partially seal the gap between and.
  21. 　前記超音波シール装置は、前記積層シートの前記超音波ホーン側に向けられる超音波印加面とは反対側の面を支持する支持ロールを備えている、請求項２０に記載の伸縮性複合シートの製造方法。 21. The stretchable composite sheet according to claim 20, wherein the ultrasonic sealing device includes a support roll that supports a surface of the laminated sheet opposite to an ultrasonic wave application surface facing the ultrasonic horn side. Production method.
  22. 　前記超音波ホーンの先端面又は前記支持ロールの表面には、前記伸縮性複合シートに形成する前記シール部に対応するパターンで、シール用凸部が形成されており、
    　前記シートシール工程では、前記積層シートを、前記支持ロールと前記超音波ホーンとの間で挟んだ状態で、該超音波ホーンにより該積層シートに超音波を印加して、前記シール部を形成する、請求項２１に記載の伸縮性複合シートの製造方法。     On the tip surface of the ultrasonic horn or the surface of the support roll, in a pattern corresponding to the seal portion formed on the stretchable composite sheet, a sealing convex portion is formed,
    In the sheet sealing step, the laminated sheet is sandwiched between the support roll and the ultrasonic horn, and ultrasonic waves are applied to the laminated sheet by the ultrasonic horn to form the seal portion. 22. The method for manufacturing a stretchable composite sheet according to claim 21.
  23. 　前記積層シートにおける前記超音波ホーン側に向けられる超音波印加面は、前記非伸縮性シートにより形成されている、請求項２１又は２２に記載の伸縮性複合シートの製造方法。 The method for manufacturing a stretchable composite sheet according to claim 21 or 22, wherein an ultrasonic wave application surface of the laminated sheet facing the ultrasonic horn is formed of the non-stretchable sheet.
  24. 　前記シートシール工程では、前記弾性フィラメントが延びる前記一方向を前記積層シートの搬送方向とするとともに、前記超音波ホーン又は前記支持ロールとして、該積層シートの幅方向に対応する方向に、シール用凸部が間欠的に複数配置されたものを用いて、前記弾性フィラメントが延びる前記一方向に直交する方向に間欠的に複数の前記シール部を形成する、請求項２１～２３の何れか１項に記載の伸縮性複合シートの製造方法。 In the sheet sealing step, the one direction in which the elastic filament extends is set as a conveying direction of the laminated sheet, and the ultrasonic protrusion or the supporting roll is used as the ultrasonic horn or the supporting roll in a direction corresponding to the width direction of the laminated sheet. The plurality of sealing portions are intermittently formed in a direction orthogonal to the one direction in which the elastic filament extends by using a plurality of portions arranged intermittently. A method for producing the elastic composite sheet described.
  25. 　前記超音波ホーンの前記積層シートに接する面に、シール用凸部が形成されており、
    　前記シートシール工程では、前記弾性フィラメントが延びる前記一方向を前記積層シートの搬送方向とするとともに、該積層シートに間欠的に超音波振動を印加し、該積層シートの該搬送方向に間欠的に前記シール部を形成する、請求項２０～２４の何れか１項に記載の伸縮性複合シートの製造方法。     On the surface of the ultrasonic horn in contact with the laminated sheet, a convex portion for sealing is formed,
    In the sheet sealing step, the one direction in which the elastic filament extends is set as a conveying direction of the laminated sheet, and ultrasonic vibration is intermittently applied to the laminated sheet, and the laminated sheet is intermittently conveyed in the conveying direction. The method for manufacturing a stretchable composite sheet according to any one of claims 20 to 24, wherein the seal portion is formed.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023234098A1 (en) * 2022-06-03 2023-12-07 ユニ・チャーム株式会社 Composite sheet for absorbent articles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102574568B1 (en) * 2020-09-29 2023-09-04 카오카부시키가이샤 Sheet for mask, manufacturing method thereof, and mask provided therewith

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008179128A (en) * 2006-12-28 2008-08-07 Kao Corp Flexible sheet
JP2009118921A (en) * 2007-11-12 2009-06-04 Kao Corp Absorbent article
JP2009160919A (en) * 2007-12-10 2009-07-23 Kao Corp Stretchable composite sheet
JP3210463U (en) * 2017-03-03 2017-05-25 花王株式会社 Nonwoven fabric, surface sheet of absorbent article using the same, and absorbent article using the same
JP2018038465A (en) * 2016-09-05 2018-03-15 ユニ・チャーム株式会社 Disposable diaper

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2007326553B2 (en) * 2006-11-28 2012-05-03 Uni-Charm Corporation Composite sheet and absorbent article comprising composite sheet
CN204433105U (en) * 2015-02-02 2015-07-01 瑞安市海诚机械有限公司 The super sonic automatic bag making device of wrapping machine
JP6743712B2 (en) * 2017-01-06 2020-08-19 三菱マテリアル株式会社 Infrared sensor mounting member

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008179128A (en) * 2006-12-28 2008-08-07 Kao Corp Flexible sheet
JP2009118921A (en) * 2007-11-12 2009-06-04 Kao Corp Absorbent article
JP2009160919A (en) * 2007-12-10 2009-07-23 Kao Corp Stretchable composite sheet
JP2018038465A (en) * 2016-09-05 2018-03-15 ユニ・チャーム株式会社 Disposable diaper
JP3210463U (en) * 2017-03-03 2017-05-25 花王株式会社 Nonwoven fabric, surface sheet of absorbent article using the same, and absorbent article using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023234098A1 (en) * 2022-06-03 2023-12-07 ユニ・チャーム株式会社 Composite sheet for absorbent articles

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