JP4322140B2 - Composite elastic member and manufacturing method thereof - Google Patents

Composite elastic member and manufacturing method thereof Download PDF

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JP4322140B2
JP4322140B2 JP2004024747A JP2004024747A JP4322140B2 JP 4322140 B2 JP4322140 B2 JP 4322140B2 JP 2004024747 A JP2004024747 A JP 2004024747A JP 2004024747 A JP2004024747 A JP 2004024747A JP 4322140 B2 JP4322140 B2 JP 4322140B2
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elastic member
sheet materials
composite
elastic
joint
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JP2005212405A (en
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賢治 安藤
賢司 小林
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Kao Corp
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Kao Corp
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Priority to JP2004024747A priority Critical patent/JP4322140B2/en
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Priority to EP04772677.3A priority patent/EP1666178B1/en
Priority to CN200810170447.8A priority patent/CN101390791B/en
Priority to KR1020067002782A priority patent/KR101105987B1/en
Priority to US10/569,204 priority patent/US7582348B2/en
Priority to PCT/JP2004/012723 priority patent/WO2005025789A1/en
Priority to TW093126884A priority patent/TW200513241A/en
Publication of JP2005212405A publication Critical patent/JP2005212405A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/087—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using both a rotary sonotrode and a rotary anvil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0046—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/48—Wearing apparel
    • B29L2031/4871—Underwear
    • B29L2031/4878—Diapers, napkins

Description

本発明は、柔軟で感触が柔らかく、肌触りも良好なギャザーを形成し得る複合伸縮部材及びその製造方法に関する。   The present invention relates to a composite stretchable member that can form a gather that is flexible, soft to the touch, and has a good touch, and a method for manufacturing the same.

使い捨ておむつ、生理用ナプキン等の吸収性物品においては、シート材に弾性部材を伸長状態で接合し、その弾性部材を収縮させて該シート材にギャザー（多数の襞を有する伸縮部）を形成させることが広く行われている。   In an absorbent article such as a disposable diaper and a sanitary napkin, an elastic member is joined to a sheet material in an expanded state, and the elastic member is contracted to form a gather (an elastic part having a large number of wrinkles) on the sheet material. It is widely done.

特許文献１には、平坦なシート材料を折り曲げて山と谷を繰り返す多数の襞を形成し、弾性部材を襞の複数の山の頂部に接合してなる弾性伸縮性のシートが開示されている。
また、特許文献２には、不織布製のシート材と該シート材を折り返して形成した２層部分に挟まれた弾性部材とを有する弾性伸縮部であって、該弾性部材の伸縮方向に直交する方向に延びるシート材同士の線状の接合部分を有し、該接合部分において該弾性部材を前記シート材に接合してなる弾性伸縮部を備えた使い捨ておむつが記載されている。 Patent Document 1 discloses an elastic stretchable sheet formed by bending a flat sheet material to form a large number of ridges that repeat peaks and valleys, and joining elastic members to the tops of a plurality of peaks of the ridges. .
Patent Document 2 discloses an elastic stretch part having a sheet material made of nonwoven fabric and an elastic member sandwiched between two layers formed by folding the sheet material, and is orthogonal to the stretch direction of the elastic member. A disposable diaper having a linear joint portion between sheet materials extending in a direction and having an elastic stretchable portion formed by joining the elastic member to the sheet material at the joint portion is described.

特開２００１−１１７６９号公報JP 2001-11769 A 登録実用新案第２５１８９５３号公報Registered Utility Model No. 2518953

しかし、特許文献１記載のシートにおいては、襞が複数本の前記弾性部材に亘っており、比較的見た目に美しいものではあるが、その一方で、シート材と弾性部材との接合部の存在に起因して、襞が肌に接触したときの感触があまりよくない。
他方、特許文献２記載の弾性伸縮部においては、シート材同士の線状の接合部分に起因して、その接合部分と平行な方向の柔軟性が劣り、肌に接触したときの柔らかさや感触の点において改善の余地がある。 However, in the sheet described in Patent Document 1, the wrinkle extends over a plurality of the elastic members and is relatively beautiful. On the other hand, the presence of the joint between the sheet material and the elastic member is present. As a result, the touch when the heel touches the skin is not so good.
On the other hand, in the elastic expansion and contraction part described in Patent Document 2, due to the linear joining part between the sheet materials, the flexibility in the direction parallel to the joining part is inferior, and the softness and touch when touching the skin are poor. There is room for improvement.

従って、本発明の目的は、柔軟で感触が柔らかく、肌触りも良好なギャザーを形成し得る複合伸縮部材及びその好ましい製造方法を提供することにある。   Accordingly, an object of the present invention is to provide a composite stretchable member that can form a gather that is flexible, soft to the touch, and has a good touch, and a preferred method for producing the same.

本発明は、２枚のシート材と、これら両シート材間に配された複数本の弾性部材とからなる複合伸縮部材であって、前記２枚のシート材が、前記弾性部材の伸縮方向及びその交差方向の両方向に間欠的に接合されて、前記両方向それぞれに沿って、それぞれ複数の接合部からなる接合ラインが複数本形成されており、前記弾性部材の少なくとも２本が、前記伸縮方向に沿う接合ラインを構成する各接合部と重なるように配されて、該各接合部において前記両シート材間に固定されており、前記両シート材それぞれが、前記伸縮方向の交差方向に沿う接合ライン同士間において襞を形成している複合伸縮部材を提供することにより前記目的を達成したものである。   The present invention is a composite elastic member comprising two sheet materials and a plurality of elastic members disposed between the two sheet materials, wherein the two sheet materials are provided in the elastic direction of the elastic members and A plurality of joint lines each formed by a plurality of joint portions are formed along each of the two directions in the intersecting direction, and at least two of the elastic members extend in the extension / contraction direction. It arrange | positions so that it may overlap with each junction part which comprises the joining line along, and is fixed between the said both sheet materials in each said junction part, Each said both sheet materials are the joining lines along the cross direction of the said expansion-contraction direction. The object is achieved by providing a composite elastic member in which a ridge is formed between each other.

本発明は、前記複合伸縮部材の好ましい製造方法であって、２枚のシート材間に複数本の弾性部材を伸張状態で配置し、その積層体を、複数の凸部で部分的に加熱加圧して、両シート材同士を、前記接合部が形成されるように部分的に熱融着する工程を具備しており、前記部分的な加熱加圧は、前記弾性部材を切断しないように行う複合伸縮部材の製造方法を提供するものである。   The present invention is a preferred method for producing the composite elastic member, wherein a plurality of elastic members are arranged in an expanded state between two sheets, and the laminate is partially heated by a plurality of convex portions. The sheet material is partially heat-sealed so that the joint portion is formed, and the partial heating and pressurization is performed so as not to cut the elastic member. The manufacturing method of a composite elastic member is provided.

本発明の複合伸縮部材は、柔軟で感触が柔らかく、肌触りも良好なギャザー（多数の襞を有する伸縮部）を有しており、吸収性物品等にそのようなギャザーを形成することができる。
本発明の複合伸縮部材の製造方法によれば、柔軟で感触が柔らかく、肌触りも良好なギャザー（多数の襞を有する伸縮部）を有する複合伸縮部材を容易に製造することができる。 The composite stretchable member of the present invention has a gather (a stretchable part having a large number of wrinkles) that is soft and soft to the touch, and can form such a gather on an absorbent article or the like.
According to the method for producing a composite stretchable member of the present invention, a composite stretchable member having a gather (a stretchable part having a large number of wrinkles) that is soft and soft to the touch and that has a good touch can be easily produced.

以下本発明をその好ましい実施形態を、図面を参照しながら説明する。
本発明の一実施形態としての複合伸縮部材１は、図１及び図２に示すように、２枚のシート材２，３と、これら両シート材間に配された複数本の弾性部材４とからなる。
複合伸縮部材１は、平面視して矩形状を有しており、弾性部材４が延びる方向の両端部には、端部シール部１１（一方のみ図示）が、弾性部材４の伸縮方向（延在方向）の直交方向に連続的に形成されており、該端部シール部１１においては、総ての弾性部材４が両シート材２，３に挟まれた状態で固定されている。複合伸縮部材１は、端部シール部１１を除く部分が伸縮部１０となっている。 Hereinafter, the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the composite elastic member 1 as one embodiment of the present invention includes two sheet materials 2 and 3, and a plurality of elastic members 4 disposed between the two sheet materials. Consists of.
The composite elastic member 1 has a rectangular shape in plan view, and end seal portions 11 (only one is shown) are provided at both ends of the elastic member 4 in the extending direction. In the end seal portion 11, all the elastic members 4 are fixed in a state of being sandwiched between both sheet materials 2 and 3. The composite stretchable member 1 has a stretchable portion 10 except for the end seal portion 11.

２枚のシート材２，３は、図２に示すように、弾性部材４の伸縮方向（Ｘ方向）及びその直交方向（Ｙ方向）の両方向に間欠的に熱融着（接合）されている。弾性部材４の伸縮方向の交差方向とは、弾性部材４の伸縮方向に対して所定の角度をなす方向（非平行な方向）であり、本実施形態においては、弾性部材４の伸縮方向と直交する方向（Ｙ方向）である。弾性部材４の伸縮方向の交差方向は、該伸縮方向との交差角度が、本実施形態のように直交する場合の交差角度を９０°とした場合に好ましくは７５°〜１０５°であり、より好ましくは８５°〜９５°であり、特に好ましくは９０°である。   As shown in FIG. 2, the two sheet materials 2 and 3 are intermittently heat-sealed (joined) in both directions of the elastic member 4 in the expansion / contraction direction (X direction) and the orthogonal direction (Y direction). . The intersecting direction of the elastic member 4 with respect to the expansion / contraction direction is a direction (non-parallel direction) that forms a predetermined angle with respect to the expansion / contraction direction of the elastic member 4, and is orthogonal to the expansion / contraction direction of the elastic member 4 in this embodiment. Direction (Y direction). The crossing direction of the elastic member 4 in the expansion / contraction direction is preferably 75 ° to 105 ° when the crossing angle with the expansion / contraction direction is 90 ° when orthogonal to each other as in the present embodiment. The angle is preferably 85 ° to 95 °, particularly preferably 90 °.

本実施形態における複数本の弾性部材４は、互いに平行に配されており、複数本の弾性部材が互いに平行に配されている場合における弾性部材４の伸縮方向は、弾性部材４が延びる方向と同じ方向である。複数本の弾性部材４が互いに平行に配されていない場合の弾性部材４の伸縮方向は、後述する襞６が延びる方向に直交する方向である。   In the present embodiment, the plurality of elastic members 4 are arranged in parallel to each other, and the expansion and contraction direction of the elastic member 4 when the plurality of elastic members are arranged in parallel to each other is the direction in which the elastic member 4 extends. The same direction. The expansion / contraction direction of the elastic member 4 when the plurality of elastic members 4 are not arranged in parallel to each other is a direction orthogonal to the direction in which the flange 6 described later extends.

複合伸縮部材１には、図２に示すように、弾性部材４の伸縮方向（Ｘ方向）に、それぞれ複数の熱融着部（接合部）５からなる接合ライン５０（一本のみ符号を付して図示）が複数本（図示例では７本）形成されており、また、弾性部材４の伸縮方向の直交方向（Ｙ方向）に、それぞれ複数の熱融着部（接合部）５からなる接合ライン５１（一本のみ符号を付して図示）が複数本形成されている。   As shown in FIG. 2, the composite stretchable member 1 is attached with a joint line 50 (only one is denoted by a reference numeral) in the stretchable direction (X direction) of the elastic member 4. Are formed (seven in the illustrated example), and each of the elastic members 4 includes a plurality of heat-sealing portions (joining portions) 5 in the direction perpendicular to the expansion / contraction direction (Y direction). A plurality of joining lines 51 (only one is shown with a reference numeral) are formed.

弾性部材４の伸縮方向（Ｘ方向）に沿う接合ライン５０同士は、互いに平行に形成されており、該伸縮方向の直交方向（Ｙ方向）に沿う接合ライン５１同士も、互いに平行に形成されている。そして、Ｘ方向に沿う２つの接合ライン５０同士間には、熱融着部５が存在しない領域が、複合伸縮部材１の両端部の端部シール部１１（一方のみ図示）間に亘って連続的に形成されている。   The joining lines 50 along the expansion / contraction direction (X direction) of the elastic member 4 are formed in parallel with each other, and the joining lines 51 along the direction orthogonal to the expansion / contraction direction (Y direction) are also formed in parallel with each other. Yes. And the area | region where the heat-fusion part 5 does not exist continues between the two end line seal parts 11 (only one is shown) of the composite expansion-contraction member 1 between the two joining lines 50 along the X direction. Is formed.

柔軟性を向上させる観点から、弾性部材４の伸縮方向の交差方向（本実施形態ではＹ方向）に沿う接合ライン（交差方向に沿って延びる接合ライン）において、熱融着部（接合部）５の長さＬ１（図２参照）と、該熱融着部（接合部）の配置ピッチＰ１（図２参照）との比（Ｐ１／Ｌ１）は１．０５〜８０、特に１．０５〜１５であることが好ましく、該熱融着部（接合部）の配置ピッチＰ１は１〜４０ｍｍ、特に２〜１５ｍｍであることが好ましい。
同様の観点から、前記長さＬ１は０．５〜２０ｍｍ、特に１〜１０ｍｍ、前記長さＬ２は０．５〜３０ｍｍ、特に１〜２０ｍｍであることが好ましい。 From the viewpoint of improving flexibility, in the joining line (joining line extending along the intersecting direction) along the intersecting direction (Y direction in the present embodiment) of the elastic member 4 in the expansion / contraction direction, the heat fusion part (joining part) 5 The ratio (P1 / L1) between the length L1 (see FIG. 2) and the arrangement pitch P1 (see FIG. 2) of the heat-sealing part (joining part) is 1.05 to 80, particularly 1.05 to 15 It is preferable that the arrangement pitch P1 of the heat-sealed part (joint part) is 1 to 40 mm, particularly 2 to 15 mm.
From the same viewpoint, the length L1 is preferably 0.5 to 20 mm, particularly 1 to 10 mm, and the length L2 is preferably 0.5 to 30 mm, particularly 1 to 20 mm.

襞６、特に複数本の弾性部材４に亘って連続して延びる見た目に美しい襞６を形成させる観点から、弾性部材４の伸縮方向（Ｘ方向）に沿う接合ラインにおける、熱融着部（接合部）５の配置ピッチＰ２（図２参照）は１〜３０ｍｍ、特に２〜１５ｍｍであることが好ましく、各熱融着部５の同方向の長さＬ３（図２参照）は０．１〜５ｍｍ、特に０．２〜１．５ｍｍであることが好ましく、前記ピッチＰ２と前記長さＬ３の比（Ｐ２／Ｌ３）は１．１〜３００、特に４〜１００であることが好ましい。   From the viewpoint of forming an eyebrow 6, particularly an eyebrow 6 that looks beautifully extending continuously across a plurality of elastic members 4, a heat fusion part (joint) in a joining line along the expansion / contraction direction (X direction) of elastic member 4 Part) 5 is preferably 1 to 30 mm, particularly preferably 2 to 15 mm, and the length L3 (see FIG. 2) in the same direction of each heat-sealing part 5 is 0.1 to 0.1 mm. It is preferably 5 mm, particularly 0.2 to 1.5 mm, and the ratio (P2 / L3) of the pitch P2 to the length L3 is preferably 1.1 to 300, particularly 4 to 100.

上述した各部の寸法や比は、図２に示すように、複合伸縮部材を、弾性部材を伸張させて平面状に拡げた状態（弾性部材を切断する等により弾性部材の影響を一切排除した状態で平面状に広げた場合と同じ寸法まで拡げた状態）において測定する。   As shown in FIG. 2, the dimensions and ratios of the above-described parts are as follows. The composite stretchable member is expanded in a flat shape by stretching the elastic member (the state in which the influence of the elastic member is completely eliminated by cutting the elastic member or the like) In the state expanded to the same dimensions as when flattened with a), the measurement is performed.

本実施形態においては、総ての弾性部材４が、弾性部材４の伸縮方向（Ｘ方向）の接合ライン５０を構成する各熱融着部（接合部）５と重なるように配されている。各弾性部材４は、Ｙ方向において各熱融着部５の中央部を通っており、各熱融着部５において切断されることなく、各熱融着部５において両シート材２，３間に固定されている。   In the present embodiment, all the elastic members 4 are arranged so as to overlap with the respective heat fusion portions (joining portions) 5 constituting the joining line 50 in the expansion / contraction direction (X direction) of the elastic member 4. Each elastic member 4 passes through the central portion of each heat-sealing portion 5 in the Y direction, and is not cut at each heat-sealing portion 5, and between each sheet material 2, 3 at each heat-sealing portion 5. It is fixed to.

本実施形態の複合伸縮部材１おいては、その自然状態（外力を加えない状態）において、弾性部材４が収縮して、図１に示すように、２枚のシート材２，３のそれぞれが、弾性部材４の伸縮方向の交差方向（Ｙ方向）に沿う接合ライン同士間において襞６，６・・を形成している。   In the composite stretchable member 1 of the present embodiment, the elastic member 4 contracts in its natural state (a state in which no external force is applied), so that each of the two sheet materials 2 and 3 is, as shown in FIG. , 6, 6... Are formed between the joining lines along the crossing direction (Y direction) of the elastic member 4 in the expansion / contraction direction.

両シート２，３の各襞６は、複合伸縮部材１の両面にそれぞれ突出するように形成されており、各襞６の突出方向の先端部は、断面円弧状の凸曲面を形成している。各襞６は、弾性部材４と重なる箇所において分断されることなく、前記直交方向（Ｙ方向）において、各々複数本の弾性部材４間に亘るように連続的に延びているため、見た目に非常に美しい。   Each ridge 6 of both sheets 2 and 3 is formed so as to protrude from both surfaces of the composite elastic member 1, and the tip end portion of each ridge 6 in the protruding direction forms a convex curved surface having an arcuate cross section. . Each of the flanges 6 is continuously divided so as to extend between the plurality of elastic members 4 in the orthogonal direction (Y direction) without being divided at a portion where the elastic members 4 overlap with each other. Beautiful.

本実施形態の複合伸縮部材１は、弾性部材４が、弾性部材４の伸縮方向（Ｘ方向）に沿う接合ライン５０を構成する各熱融着部５において両シート材２，３間に固定されているため、弾性部材４の収縮応力は各熱融着部間の両シート材を確実に収縮させるために使われるため、各部に形成される襞６を容易に均質化することができ、その均質性が損なわれない。しかも、弾性部材４の伸縮方向の交差方向（Ｙ方向）に沿う接合ライン５１が、間欠配置された複数の熱融着部（接合部）５からなるため、複合伸縮部材１が非常に柔軟であり、例えば複合伸縮部材１をＹ方向に圧縮する力や、該複合伸縮部材１を同方向に湾曲させたりする力に対して、複合伸縮部材１が柔軟に変形する。そのため、例えば、吸収性物品にギャザー（多数の襞を有する伸縮部）、特に立体ギャザー（起立した防漏壁）を形成するために用いた場合に、ギャザーが肌に接触した場合の感触が柔らかく良好であり、ギャザーが肌に与える刺激も低減することができる。   In the composite stretchable member 1 of the present embodiment, the elastic member 4 is fixed between the sheet materials 2 and 3 at each heat-sealing portion 5 constituting the joining line 50 along the stretchable direction (X direction) of the elastic member 4. Therefore, since the shrinkage stress of the elastic member 4 is used to surely shrink both the sheet materials between the heat fusion parts, the ridges 6 formed in each part can be easily homogenized. Homogeneity is not impaired. Moreover, since the joining line 51 along the crossing direction (Y direction) of the elastic member 4 is composed of a plurality of intermittently arranged heat-sealing parts (joining parts) 5, the composite elastic member 1 is very flexible. Yes, for example, the composite elastic member 1 is flexibly deformed with respect to a force for compressing the composite elastic member 1 in the Y direction and a force for bending the composite elastic member 1 in the same direction. Therefore, for example, when used to form a gather (a stretchable part having a large number of wrinkles), particularly a three-dimensional gather (an upstanding leak-proof wall) on an absorbent article, the touch when the gather contacts the skin is soft. It is good, and the irritation that the gather gives to the skin can also be reduced.

また、本実施形態の複合伸縮部材１は、弾性部材４が、一方のシート材２における襞６と襞６との間の谷部と他方のシート材３における襞６と襞６との間の谷部との間に挟まれた状態で存在すること、及び、襞の先端が凸曲面を形成していることにより、シート材の厚み方向にボリュームが出るとともに、複合伸縮部材１の表面に触れたときの感触が極めて柔らかく、肌触りが極めて良好である。   Further, in the composite stretchable member 1 of the present embodiment, the elastic member 4 is between the trough 6 and the scissors 6 in the one sheet material 2 and between the scissors 6 and 6 in the other sheet material 3. As a result of being sandwiched between the valleys and the tip of the ridge forming a convex curved surface, a volume is generated in the thickness direction of the sheet material and the surface of the composite elastic member 1 is touched. Feels very soft and feels very good.

本実施形態の複合伸縮部材１の形成材料について説明する。
前記シート材２，３としては、それぞれ、例えばエアースルー不織布、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各種製法による不織布、織布、編布、樹脂フィルム等、及びこれら２以上を積層一体化させてなるシート材等を用いることができる。
見た目に美しく、感触の良い柔軟な襞を形成させる観点から、両シート材又は一方のシート材（特に複合伸縮部材を肌に当接させる用途に用いる場合の肌側の面を形成するシート材）の形成材料は、エアースルー不織布、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であることが好ましい。 The material for forming the composite elastic member 1 of this embodiment will be described.
Examples of the sheet materials 2 and 3 include nonwoven fabrics, woven fabrics, knitted fabrics, resin films, and the like produced by various manufacturing methods such as air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric. A sheet material obtained by stacking and integrating the above can be used.
Both sheet materials or one sheet material (especially a sheet material that forms a skin-side surface when used for making a composite elastic member abut on the skin) from the viewpoint of forming a beautifully pleasing and comfortable feel. The forming material is preferably an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, or the like.

襞６は、弾性部材４の収縮により両シ−ト材２，３を変形させて生じさせる。そのため、このシートの剛性がこの複合伸縮部材の襞の成形性・クッション性を決める重要な要素となる。剛性はシート材料の座屈強度によって表すことができる。本発明に用いられる不織布の座屈強度は１００ｃＮ以下、特に７０ｃＮ以下であることが好ましい。ここで、座屈強度は、下記に示す様に、テンシロン万能試験装置（オリエンテック社製）の圧縮試験モードにより測定することができる。   The scissors 6 are generated by deforming both the sheet materials 2 and 3 by the contraction of the elastic member 4. Therefore, the rigidity of the sheet is an important factor that determines the formability and cushioning properties of the heel of the composite elastic member. Stiffness can be represented by the buckling strength of the sheet material. The buckling strength of the nonwoven fabric used in the present invention is preferably 100 cN or less, particularly preferably 70 cN or less. Here, the buckling strength can be measured by a compression test mode of a Tensilon universal testing apparatus (manufactured by Orientec) as shown below.

座屈強度試験法（ＣＤ）：
機械流れ方向（ＭＤ）に１５０ｍｍ、機械流れ方向と直交する方向（ＣＤ）に３０ｍｍの長方形の試験片を取り、直径４５ｍｍの円筒を作り、重なり合った部分の上端と下端とをホッチキス等で止め測定サンプルとする。これを、テンシロン万能試験装置の圧縮武験モードにより、測定環境２０℃、６５％ＲＨ、測定条件としては、圧縮速度１０ｍｍ／ｍｉｎ、測定距離２０ｍｍで測定を行う。サンプルを２０ｍｍ圧縮した時の最大強度を各サンプルについて測定し、その平均値を求め、これを座屈強度とする。
前述したように、シート材としては好ましくは不繊布が用いられる。不織布の坪量としては、好ましくは５〜５０ｇ／ｍ2、特に好ましくは８〜３０ｇ／ｍ2である。そうした坪量の不織布の座屈強度は、好ましくはＣＤ方向で５０ｃＮ以下、特に好ましくは３０ｃＮ以下、ＭＤ方向で好ましくは７０ｃＮ以下、特に好ましくは５０ｃＮ以下である。柔らかいシート材を使用することで、襞の成形性を高めることが出来る。 Buckling strength test method (CD):
Take a rectangular test piece of 150 mm in the machine flow direction (MD) and 30 mm in the direction perpendicular to the machine flow direction (CD), make a cylinder with a diameter of 45 mm, and measure the upper and lower ends of the overlapping parts with staples etc. A sample. This is measured at a measurement environment of 20 ° C., 65% RH, and measurement conditions of a compression speed of 10 mm / min and a measurement distance of 20 mm in the compression test mode of the Tensilon universal testing device. The maximum strength when the sample is compressed by 20 mm is measured for each sample, the average value is obtained, and this is taken as the buckling strength.
As described above, a non-woven cloth is preferably used as the sheet material. The basis weight of the nonwoven fabric is preferably 5 to 50 g / m 2 , particularly preferably 8 to 30 g / m 2 . The buckling strength of the nonwoven fabric having such a basis weight is preferably 50 cN or less, particularly preferably 30 cN or less in the CD direction, and preferably 70 cN or less, particularly preferably 50 cN or less in the MD direction. By using a soft sheet material, the moldability of the ridge can be improved.

また、シート材は、熱融着による接合を容易にする観点から、その形成素材（不織布の場合の繊維、樹脂フィルムのフィルム材料等）が熱融着性の樹脂からなることが好ましく、熱融着性の樹脂としては、ポリエチレン、ポリプロピレン等が挙げられる。不織布等を構成する繊維は、表面のみが熱融着性の樹脂からなる芯鞘型の複合繊維等であっても良い。
尚、２枚のシート材のうちの一方のシート材と他方のシート材とでは、形成材料が同一でも異なっていても良い。 Further, from the viewpoint of facilitating bonding by heat fusion, the sheet material is preferably made of a heat-fusible resin as a forming material (fiber in the case of a nonwoven fabric, film material of a resin film). Examples of the adhesive resin include polyethylene and polypropylene. The fiber constituting the nonwoven fabric or the like may be a core-sheath type composite fiber or the like made of a resin whose surface is only heat-fusible.
The forming material may be the same or different between one sheet material and the other sheet material of the two sheet materials.

本発明における２枚のシート材は、別体の２枚のシートに限られるものではなく、一枚のシート材を折り曲げて相対向する２面を形成し、一方の面を構成する部分を１枚のシート材、他方の面を構成する部分をもう１枚のシート材とすることもできる。   The two sheet materials in the present invention are not limited to two separate sheets, but one sheet material is bent to form two opposing surfaces, and a portion constituting one surface is defined as 1 One sheet material and the part constituting the other surface may be another sheet material.

弾性部材４の形成材料としては、使い捨ておむつや生理用ナプキン等の吸収性物品に用いられる各種公知の弾性材料を特に制限なく用いることができ、例えば素材としては、スチレン−ブタジエン、ブタジエン、イソプレン、ネオプレン等の合成ゴム、天然ゴム、ＥＶＡ、伸縮性ポリオレフィン、ポリウレタン等を挙げることができ、形態としては、断面が矩形、正方形、円形、多角形状等の糸状ないし紐状（平ゴム等）のもの、或いはマルチフィラメントタイプの糸状のもの等を用いることができる。   As a material for forming the elastic member 4, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Synthetic rubber such as neoprene, natural rubber, EVA, stretchable polyolefin, polyurethane, etc. Alternatively, a multifilament type thread or the like can be used.

この複合伸縮部材の襞の成形性を決めるもう一つの要素は、弾性部材の伸長倍率と伸縮応力である。襞の断面形状を凸形状にするために所要の弾性部材の伸長倍率と伸縮応力が必要となる。弾性部材は、好ましくは２０〜１０００％、特に好ましくは５０〜４００％の伸長状態にてシート材に対して適用される。そうして、弾性部材が収縮し、収縮した部分の不織布が余り、熱融着郡の貼り合わせ面とは反対側の方向に、外側に断面凸形状に変形することで襞が形成される。
以上のように、襞の高さは成形性・クッション性を考えるとき重要であり、接合部パターンと間隔、材料及び弾性部材の選択により、任意に設計することができる。この襞の高さは，好ましくは片側１〜１５ｍｍ程度である。襞を高くするためには、相隣接する接合部の間隔を所定の寸法だけ確保し、その間隔が詰まるだけの伸縮伸長倍率と凸形状の襞が形成させることで、ボリューム感のある柔らかい複合伸縮部材を形成することができる。襞の片側の高さがｈのものをつくるとき、このとき接合部の間隔は最低でも２×ｈとすることが好ましく、間隔が２×ｈの最低値の場合に弾性部材は相隣接する接合部が隣接するくらい収縮することが好ましい。 Another factor that determines the moldability of the composite elastic member is the expansion ratio and elastic stress of the elastic member. In order to make the cross-sectional shape of the ridge convex, the required expansion ratio and elastic stress of the elastic member are required. The elastic member is preferably applied to the sheet material in a stretched state of 20 to 1000%, particularly preferably 50 to 400%. Then, the elastic member contracts, and the non-woven fabric of the contracted portion is left, and the wrinkles are formed by deforming outwardly in the direction opposite to the bonding surface of the heat-sealing group into a convex cross section.
As described above, the height of the ridge is important when considering formability and cushioning properties, and can be arbitrarily designed by selecting the joint pattern and interval, the material, and the elastic member. The height of the ridge is preferably about 1 to 15 mm on one side. In order to increase the wrinkles, the distance between adjacent joints is secured by a predetermined size, and the expansion and contraction magnification and the convex wrinkles are sufficient to close the gap, thereby creating a soft composite stretch with a sense of volume. A member can be formed. When making a piece having a height of h on one side of the ridge, at this time, it is preferable that the distance between the joints is at least 2 × h, and when the distance is the minimum value of 2 × h, the elastic members are adjacent to each other. It is preferable that the parts contract so that they are adjacent to each other.

好ましい弾性部材の一つに、天然ゴム（または合成ゴム）がある。天然ゴム（合成ゴム）としては、厚みが０．０５〜１．５ｍｍ、幅が０．２〜５ｍｍであって、断面積にもよるが代表的な断面積として０．３５ｍｍ厚みの０．９１ｍｍ幅の単糸の１００％伸長時の応力が１〜７０ｇｆ程度、好ましくは１〜４０ｇｆ程度、特に好ましくは１〜３０ｇｆ程度の低モジュラスの弾性部材が望まれる。複合伸縮部材に、こうした応力特性を有する性部材を複数本用いる。
他の好ましい弾性部材に、ポリウレタンのスパンデックス弾性繊維がある。単糸のサイズが１０〜３３６０デニールのもの、特に好ましくは７０〜１１２０デニールのものが用いられる。デニールは糸の太さを表す単位であり、９０００ｍで１ｇある糸を１デニールと呼ぶ。このスパンデックス弾性繊維を３０〜５００％に伸長したものを複数本用いる。
上記に挙げた低モジュラスの弾性部材の単糸を、好ましくは１００％以上、特に好ましくは２００％以上の高伸長倍率で複数本配置することにより、柔らかく伸縮する美しい襞を有する複合伸縮部材を得ることができる。 One preferred elastic member is natural rubber (or synthetic rubber). Natural rubber (synthetic rubber) has a thickness of 0.05 to 1.5 mm, a width of 0.2 to 5 mm, and a typical cross-sectional area of 0.91 mm with a thickness of 0.35 mm depending on the cross-sectional area. A low modulus elastic member having a stress at the time of 100% elongation of a single yarn having a width of about 1 to 70 gf, preferably about 1 to 40 gf, particularly preferably about 1 to 30 gf is desired. A plurality of sex members having such stress characteristics are used for the composite stretchable member.
Another preferred elastic member is polyurethane spandex elastic fiber. A single yarn having a size of 10 to 3360 denier, particularly preferably 70 to 1120 denier is used. Denier is a unit representing the thickness of a yarn, and a yarn of 1 g at 9000 m is called 1 denier. A plurality of spandex elastic fibers that are stretched to 30 to 500% are used.
By disposing a plurality of the above-mentioned single yarns of the elastic member having a low modulus at a high elongation ratio of preferably 100% or more, particularly preferably 200% or more, a composite stretchable member having a beautiful fold that softly stretches is obtained. be able to.

上述した複合伸縮部材１は、例えば以下の方法により効率的且つ経済的に生産することができる。
先ず、２枚のシート材２，３間に複数本の弾性部材４を伸張状態で配置する（層間は非接着）。そして、その積層体１２を、図３に示すように、複数の凸部７で部分的に加熱加圧して、両シート材２，３同士を、熱融着部５の形成パターン（図２参照）に対応するパターンで部分的に熱融着する。この部分的な加熱加圧の際には、弾性部材４を切断しないようにすることが必要である。両シート材同士が熱融着すると共に弾性部材４が、シート材に対して、シート材に含まれる熱融着性繊維を介して熱融着するようにし、且つその弾性部材４が切断されないようにするには、例えば、(1)凸部７のアンビルロール７１に対する押し付け圧力、(2)凸部７とアンビルロール７１のクリアランス、(3)凸部７とアンビルロール７１の温度、の３つのパラメータを振って最適な条件を導き出すことが好ましい。また、弾性部材の材料として加圧や熱の影響を受け難い材料、すなわち切れ難い材料を選ぶことや、製品仕様として伸長率を低く抑えて使用することも、弾性部材を切断しない方法として有効である。 The composite elastic member 1 described above can be produced efficiently and economically, for example, by the following method.
First, a plurality of elastic members 4 are arranged in an expanded state between the two sheet materials 2 and 3 (the layers are not bonded). Then, as shown in FIG. 3, the laminate 12 is partially heated and pressed by a plurality of convex portions 7, and both sheet materials 2, 3 are formed into the formation pattern of the heat-sealed portion 5 (see FIG. 2). ) Partly heat-sealed with a pattern corresponding to. During this partial heating and pressing, it is necessary not to cut the elastic member 4. Both the sheet materials are heat-sealed, and the elastic member 4 is heat-bonded to the sheet material via the heat-fusible fiber included in the sheet material, and the elastic member 4 is not cut. For example, (1) the pressing pressure of the convex portion 7 against the anvil roll 71, (2) the clearance between the convex portion 7 and the anvil roll 71, and (3) the temperature of the convex portion 7 and the anvil roll 71, It is preferable to derive the optimum conditions by changing the parameters. In addition, selecting a material that is not easily affected by pressure or heat as the material of the elastic member, that is, a material that is difficult to cut, and using the product with a low elongation rate as a product specification is also effective as a method that does not cut the elastic member. is there.

また、弾性部材に加わる圧力を積極的に減らしていく手段（押圧力低減用の手段）としては、複数の凸部７の弾性部材と交差する箇所に、圧力が加わらないような措置を施してもよい。例えば、凸部に対応するアンビルロールをシリコンゴム等のゴム製にしてもよい。ゴムの耐久性が心配な場合は、弾性部材と重なる箇所のみにゴムを巻く方法もある。別の例としては、弾性部材４に対応する部位に押圧力低減用の溝部（凹部）７２を形成した凸部を用いる。このような凸部を用いた熱融着は、例えば熱エンボス装置又は超音波エンボス装置等により行うことができ、このような凸部７を周面に有するエンボスロール７０と、該ロールに対向するアンビルロール（受けロール）７１との間に積層体１２を挿通させることにより行うことができる。
図３に示すエンボス装置においては、複数の凸部７との間で前記積層体１２を加圧する面としての、アンビルロール７１の外周面における、弾性部材４に対応する部位にも、押圧力低減用の溝部（凹部）７３が形成されている。 In addition, as a means for actively reducing the pressure applied to the elastic member (a means for reducing the pressing force), a measure is taken so that no pressure is applied to a portion of the plurality of convex portions 7 that intersects the elastic member. Also good. For example, the anvil roll corresponding to the convex portion may be made of rubber such as silicon rubber. If the durability of the rubber is a concern, there is a method in which the rubber is wound only on the portion overlapping the elastic member. As another example, the convex part which formed the groove part (concave part) 72 for pressing force reduction in the site | part corresponding to the elastic member 4 is used. The heat fusion using such a convex portion can be performed by, for example, a heat embossing device or an ultrasonic embossing device, and the embossing roll 70 having such a convex portion 7 on the peripheral surface is opposed to the roll. This can be done by inserting the laminate 12 between the anvil roll (receiving roll) 71.
In the embossing device shown in FIG. 3, the pressing force is reduced also on the portion corresponding to the elastic member 4 on the outer peripheral surface of the anvil roll 71 as the surface for pressing the laminate 12 with the plurality of convex portions 7. A groove portion (concave portion) 73 is formed.

熱融着用の凸部及び／又はその対向面に押圧力低減用の溝部７２，７３を設けることにより、弾性部材４の切断を防止しつつ、弾性部材４を熱融着部５に容易に固定することができる。尚、熱融着部における弾性部材４は、両シート材間に挟持されているのみで、両シートとの間にズレが生じないように固定されていても良いし、溶融した表面が一方又は両シート材と融着していても良い。また、押圧力低減用の溝部は、凸部又はその対向面の何れか一方にのみ設けることもできる。   The elastic member 4 can be easily fixed to the heat-sealing portion 5 while preventing the elastic member 4 from being cut by providing the heat-welding convex portion and / or the groove portions 72 and 73 for reducing the pressing force on the opposing surface. can do. In addition, the elastic member 4 in the heat-sealed portion may be fixed so as not to be displaced between both sheets only by being sandwiched between both sheets, and the melted surface may be one or It may be fused with both sheet materials. Further, the groove for reducing the pressing force can be provided only on either the convex portion or the facing surface thereof.

このようにして熱融着部５を形成した後、弾性部材４を挟んだ状態の両シート材における、弾性部材４が延びる方向において互いに離間する部位に、端部シール部１１を形成するための一体化処理を施す。この一体化処理は、熱エンボス又は超音波エンボス処理を用いることができる。また、他の一体化処理として、一方又は両方のシート材及び／又は弾性部材に接着剤を塗工し、その接着剤を塗布した部位を加圧する処理であっても良い。この一体化処理は、端部シール１１を形成しない場合には省略することができる。
そして、一体化処理を施した部位が、弾性部材４が延びる方向の両端部に位置するように、弾性部材４を挟んだ状態の両シート材２，３における所定箇所を切断する。そして、弾性部材４を収縮させて両シート材２，３のそれぞれに複数本の襞を形成させることにより、上述した構成の複合伸縮部材１が得られる。尚、上述した一体化処理は、図５に示す複合伸縮部材１”のように、熱融着部（接合部）５と重ならない弾性部材４Ｂを配する場合に、その弾性部材の端部を固定するのに特に好ましい。 After forming the heat-sealing portion 5 in this manner, the end seal portion 11 is formed in the two sheet materials in the state where the elastic member 4 is sandwiched between them in a portion separated from each other in the extending direction of the elastic member 4. Apply the integration process. For this integration process, heat embossing or ultrasonic embossing can be used. Moreover, the process which applies the adhesive agent to one or both sheet materials and / or an elastic member, and pressurizes the site | part which apply | coated the adhesive agent as another integration process may be sufficient. This integration process can be omitted when the end seal 11 is not formed.
And the predetermined location in both the sheet materials 2 and 3 of the state which pinched | interposed the elastic member 4 is cut | disconnected so that the site | part which performed the integration process may be located in the both ends of the direction where the elastic member 4 is extended. Then, the elastic member 4 is contracted to form a plurality of wrinkles on each of the sheet materials 2 and 3, whereby the composite stretchable member 1 having the above-described configuration is obtained. The above-described integration process is performed when the elastic member 4B that does not overlap with the heat-sealing part (joining part) 5 is disposed like the composite elastic member 1 '' shown in FIG. Particularly preferred for fixing.

以上、本発明の好ましい実施形態について説明したが、本発明は、上述した実施形態に制限されない。   As mentioned above, although preferable embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above.

例えば、弾性部材は、弾性部材の伸縮方向（Ｘ方向）の接合ラインの本数と同数配されていなくても良い。例えば、図４に示す複合伸縮部材１’においては、総ての弾性部材４が、弾性部材４の伸縮方向（Ｘ方向）の接合ラインを構成する各熱融着部（接合部）５と重なるように配されているが、弾性部材４は、伸縮方向（Ｘ方向）の接合ライン一つ置きにしか配されていない。   For example, the elastic members may not be arranged in the same number as the number of joining lines in the expansion / contraction direction (X direction) of the elastic members. For example, in the composite stretchable member 1 ′ shown in FIG. 4, all the elastic members 4 overlap with the respective heat-sealing portions (joint portions) 5 constituting the joint line in the stretchable direction (X direction) of the elastic member 4. However, the elastic members 4 are arranged only for every other joining line in the expansion / contraction direction (X direction).

また、図５に示す複合伸縮部材１”のように、熱融着部（接合部）と重なるように配された弾性部材４Ａに加えて、熱融着部（接合部）と重ならないように配された弾性部材４Ｂを有していても良い。図５に示す複合伸縮部材１”における弾性部材４Ｂは、端部シール部１１（一方のみ図示）においてのみ両シート材に固定されている。但し、複合伸縮部材に配されている弾性部材のうちの、最低２本が熱融着部において固定されている必要があり、複合伸縮部材に配されている弾性部材のうちの１／３以上、特に半分以上が熱融着部において固定されていることが好ましい。図５に示す複合伸縮部材１”における弾性部材は、一本置きに熱融着部に固定されているが、２本や３本等の一定の本数置きに固定されていても良い。図５に示す複合伸縮部材１”のように、弾性部材が固定された熱融着部と弾性部材が固定されていない熱融着部の両者を形成する必要がある場合には、上述した製造方法において、熱融着用の複数の凸部の一部又はその一部の凸部に対向する面にのみ、前記押圧力低減用の溝部（凹部）を形成すれば良い。   Further, in addition to the elastic member 4A arranged so as to overlap with the heat fusion part (joining part) as in the composite elastic member 1 ″ shown in FIG. 5, it does not overlap with the heat fusion part (joining part). You may have the elastic member 4B distribute | arranged. The elastic member 4B in the composite expansion-contraction member 1 "shown in FIG. 5 is being fixed to both the sheet | seat materials only in the edge part seal part 11 (only one is shown). However, at least two of the elastic members arranged on the composite elastic member need to be fixed at the heat fusion part, and 1/3 or more of the elastic members arranged on the composite elastic member In particular, it is preferable that more than half is fixed at the heat fusion part. The elastic members in the composite elastic member 1 ″ shown in FIG. 5 are fixed to the heat-sealed portion every other line, but may be fixed to a fixed number such as two or three. When it is necessary to form both the heat fusion part to which the elastic member is fixed and the heat fusion part to which the elastic member is not fixed like the composite elastic member 1 '' shown in the above-described manufacturing method, The groove (recess) for reducing the pressing force may be formed only on a part of the plurality of convex parts for heat fusion or on a surface facing the convex part of the part.

尚、複合伸縮部材中の弾性部材の本数は、複合伸縮部材の寸法や用途に応じて適宜に決定し得るが、例えば５〜３０本とすることができる。また、シート材同士の接合部は、熱融着部に代えて、ホットメルト型接着剤等を用いてシート材同士を接着した接着部であっても良い。また、熱融着部の形成パターンは適宜変更することができ、各熱融着部の形状も、矩形、長円、円、菱形等適宜の形状とすることができる。   In addition, although the number of the elastic members in a composite elastic member can be suitably determined according to the dimension and application of a composite elastic member, it can be 5-30, for example. Further, the joint portion between the sheet materials may be an adhesive portion in which the sheet materials are bonded together using a hot melt adhesive or the like instead of the heat fusion portion. Moreover, the formation pattern of a heat-fusion part can be changed suitably, and the shape of each heat-fusion part can also be made into appropriate shapes, such as a rectangle, an ellipse, a circle, and a rhombus.

本発明の複合伸縮部材は、例えば、使い捨ておむつ、生理用ナプキン等の吸収性物品の伸縮部形成用に特に好ましく用いられる。その場合、複合伸縮部材の完成後に、それを吸収性物品に固定して伸縮部を形成しても良いが、吸収性物品の製造工程に、複合伸縮部材の製造工程を組み込み、複合伸縮部材が組み込まれた状態の吸収性物品が製造されるようにすることもできる。
図６は、複合伸縮部材を用いて形成する伸縮部の例を、ファスニングテープ２１を有する使い捨ておむつ２０の場合を例に示したものであり、例えば、ウエスト回り伸縮部２２、ファスニングテープ２１に連動して伸縮するテープ近傍伸縮部２３、胴回り伸縮部２４及び防漏壁の肌当接面に形成された伸縮部２５等を、本発明の複合伸縮部材を用いて形成することができる。 The composite stretchable member of the present invention is particularly preferably used for forming stretchable portions of absorbent articles such as disposable diapers and sanitary napkins. In that case, after completion of the composite elastic member, it may be fixed to the absorbent article to form an elastic part, but the manufacturing process of the composite elastic member is incorporated into the manufacturing process of the absorbent article, It is also possible to produce an absorbent article in an incorporated state.
FIG. 6 shows an example of a stretchable part formed by using a composite stretchable member, taking a disposable diaper 20 having a fastening tape 21 as an example. For example, the waist stretchable part 22 and the fastening tape 21 are interlocked. Thus, the tape vicinity expansion / contraction part 23, the waistline expansion / contraction part 24, and the expansion / contraction part 25 formed on the skin contact surface of the leak-proof wall can be formed using the composite expansion / contraction member of the present invention.

本発明の一実施形態としての複合伸縮部材を一部破断して示す斜視図である。It is a perspective view showing a composite elastic member as one embodiment of the present invention with a part broken away. 図１の複合伸縮部材を、弾性部材を伸張させ平面状に拡げた状態を示す平面図である。It is a top view which shows the state which expanded the elastic member by extending the elastic member of the composite elastic member of FIG. 図１の複合伸縮部材の製造に使用可能なエンボス装置の一部を示す断面図である。It is sectional drawing which shows a part of embossing apparatus which can be used for manufacture of the composite elastic member of FIG. 本発明の他の実施形態としての複合伸縮部材を示す図（図２相当図）である。It is a figure (figure 2 equivalent figure) which shows the composite elastic member as other embodiment of this invention. 本発明の更に他の実施形態としての複合伸縮部材を示す図（図２相当図）である。It is a figure (figure 2 equivalent figure) which shows the composite elastic member as other embodiment of this invention. 本発明の複合伸縮部材を用いて形成する伸縮部の例を、ファスニングテープを有する使い捨ておむつの場合を例に示したものである。The example of the expansion-contraction part formed using the composite expansion-contraction member of this invention shows the case of the disposable diaper which has a fastening tape as an example.

符号の説明Explanation of symbols

１，１’，１” 複合伸縮部材
２ シート材
３ シート材
４ 弾性部材
５ 熱融着部（接合部）
６ 襞 1, 1 ', 1 "composite stretchable member 2 sheet material 3 sheet material 4 elastic member 5 heat fusion part (joint part)
6 襞

Claims (5)

２枚のシート材と、これら両シート材間に配された複数本の弾性部材とからなる複合伸縮部材であって、
前記２枚のシート材間が、前記弾性部材の伸縮方向及びその交差方向の両方向に間欠的に接合されて、それぞれ複数の接合部からなる接合ラインが、前記両方向それぞれに沿って、それぞれ複数本形成されており、
前記弾性部材の少なくとも２本が、前記伸縮方向に沿う接合ラインを構成する各接合部と重なるように配され、該各接合部において前記両シート材間に固定されており、該各接合部は、該弾性部材を挟んでその両側に位置する部分を有しており、
前記両シート材それぞれが、前記伸縮方向の交差方向に沿う接合ライン同士間において襞を形成しており、該交差方向に沿う接合ラインが延びている方向は、前記伸縮方向との交差角度が７５°〜１０５°であり、且つ該交差方向に沿う接合ラインは、複数本の前記弾性部材に亘って延びており、
前記襞は、複数本の前記弾性部材と交差するように、前記伸縮方向の前記交差方向に連続的に延びている複合伸縮部材。 A composite elastic member comprising two sheet materials and a plurality of elastic members arranged between the two sheet materials,
Wherein between two sheet materials, the elastic members stretchable direction and in both the cross direction are intermittently bonding, bonding lines consisting of their respective plurality of joints, along the directions respectively, Each is formed in multiple,
At least two of the elastic member, the disposed so as to overlap the respective junction of the cemented line along the stretching direction, is fixed between the two sheet materials at respective junctions, each of said junction , Having portions located on both sides of the elastic member,
Each of the sheet materials forms wrinkles between the joining lines along the intersecting direction of the expansion / contraction direction, and the direction in which the joining line along the intersecting direction extends has an intersection angle of 75 with the expansion / contraction direction. And a joining line extending in the intersecting direction extends over the plurality of elastic members,
The elastic member is a composite elastic member that continuously extends in the crossing direction of the elastic direction so as to cross the plurality of elastic members. 前記伸縮方向の交差方向に沿う接合ラインにおいて、前記接合部の長さＬ１と、該接合部の配置ピッチＰ１との比（Ｐ１／Ｌ１）が１．０５〜８０であり、該接合部の配置ピッチＰ１が１〜４０ｍｍである請求項１記載の複合伸縮部材。   In the joining line along the crossing direction of the expansion / contraction direction, the ratio (P1 / L1) between the length L1 of the joint and the arrangement pitch P1 of the joint is 1.05 to 80, and the arrangement of the joint The composite elastic member according to claim 1, wherein the pitch P1 is 1 to 40 mm. 前記各接合部が、前記２枚のシート材同士を熱融着して形成されている請求項１又は２記載の複合伸縮部材。   The composite stretchable member according to claim 1 or 2, wherein each joint is formed by heat-sealing the two sheet materials. ２枚のシート材と、これら両シート材間に配された複数本の弾性部材とからなり、
前記２枚のシート材間が、熱融着により、前記弾性部材の伸縮方向及びその交差方向の両方向に間欠的に接合されて、それぞれ複数の接合部からなる接合ラインが、前記両方向それぞれに沿って、それぞれ複数本形成されており、
前記弾性部材の少なくとも２本が、前記伸縮方向に沿う接合ラインを構成する各接合部と重なるように配され、該各接合部において前記両シート材間に固定されており、該各接合部は、該弾性部材を挟んでその両側に位置する部分を有している、複合伸縮部材の製造方法であって、
２枚のシート材間に複数本の弾性部材を伸張状態で配置し、その積層体を、複数の凸部で部分的に加熱加圧して、両シート材同士を、前記接合部が形成されるように部分的に熱融着する工程を具備しており、
前記部分的な加熱加圧は、前記凸部の前記弾性部材と交差する箇所に該弾性部材に加わる圧力を低減する手段を施し、該弾性部材を切断しないように行う複合伸縮部材の製造方法。 It consists of two sheet materials and a plurality of elastic members arranged between these two sheet materials,
The two sheet materials are intermittently joined to each other in the expansion / contraction direction of the elastic member and the intersecting direction thereof by thermal fusion, and a joining line composed of a plurality of joining portions is provided along each of the two directions. And a plurality of each is formed,
At least two of the elastic members are arranged so as to overlap each joint that constitutes a joint line along the expansion and contraction direction, and are fixed between the two sheet materials at each joint, , A method for producing a composite elastic member having portions located on both sides of the elastic member,
A plurality of elastic members are arranged in a stretched state between two sheet materials, and the laminate is partially heated and pressed by a plurality of convex portions to form the joint portion between the two sheet materials. A process of partially heat-sealing,
The partial heating pressurization is subjected to means for reducing the pressure applied to the elastic member at a position crossing the elastic member of the convex portions, method of producing a composite elastic member to perform so as not to cut the elastic member. 前記弾性部材に加わる圧力を低減する手段が、前記凸部の前記弾性部材と交差する箇所に設けた押圧力低減用の溝部である、請求項４記載の複合伸縮部材の製造方法。The manufacturing method of the composite elastic member of Claim 4 whose means to reduce the pressure added to the said elastic member is a groove part for the pressing force reduction provided in the location which cross | intersects the said elastic member of the said convex part.
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