JP5124187B2 - Stretchable part forming method and apparatus for forming absorbent article - Google Patents

Stretchable part forming method and apparatus for forming absorbent article Download PDF

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JP5124187B2
JP5124187B2 JP2007181589A JP2007181589A JP5124187B2 JP 5124187 B2 JP5124187 B2 JP 5124187B2 JP 2007181589 A JP2007181589 A JP 2007181589A JP 2007181589 A JP2007181589 A JP 2007181589A JP 5124187 B2 JP5124187 B2 JP 5124187B2
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elastic
sheet
elastic member
stretchable
protrusions
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JP2008104853A (en
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広幸 矢野
貞直 真鍋
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Daio Paper Corp
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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
    • 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
    • B29C65/086—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 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
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/344—Stretching or tensioning the joint area during joining
    • 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
    • B29C66/70—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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • 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
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on 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
    • 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
    • B29C66/431—Joining the articles to themselves
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Description

本発明は、吸収性物品における伸縮部形成方法及びその形成装置に関するものである。   The present invention relates to a stretchable part forming method in an absorbent article and a forming apparatus therefor.

例えば、吸収性物品であるパンツ型の紙おむつにおいて、図１及び図２に示すように、フィット機能を付加させるため、伸縮部として腹及び腰回りにシャーリングＳを形成する場合がある（例えば、特許文献１参照）。このシャーリングＳは、２枚または３枚以上の通気・撥水性の不織布を積層固定してなるシート１で糸ゴム等の弾性伸縮部材２，２，…を挟み込み、弾性伸縮部材２，２，…を引張った状態で、間欠的に弾性伸縮部材２，２，…とシート１とをホットメルト等の接着剤で固定し、この弾性伸縮部材２，２，…を収縮させて形成されるものである。なお、図１において、ＷＯはウエスト開口部、ＬＯはレッグ開口部を示している。
弾性伸縮部材２，２，…を不織布等のシート１に固定するための公知の技術として、オンラインで弾性伸縮部材２，２，…若しくはシートのどちらか一方、又は弾性伸縮部材２，２，…及びシート１の両方にホットメルト等の接着剤を塗布し、その後、弾性伸縮部材２，２，…を挟み込んだ状態でニップすることにより固着させるのが一般的である。
また近年では、間欠的に配置され、接着面となる突起によって構成されたアンビルロール（図示せず）と、これに対向する位置に配置された熱融着装置（図示せず）との間に、シート１で弾性伸縮部材２，２，…を挟み込んだ状態で連続供給し、シート１と弾性伸縮部材２，２，…とを機械的に挟み潰した状態で固定する技術も紹介されている。
特開２００２−１７２１３２号公報 特開２００４−３３０７７７号公報 For example, in a pants-type paper diaper that is an absorbent article, as shown in FIGS. 1 and 2, a shirring S may be formed around the abdomen and waist as an expansion / contraction part in order to add a fitting function (for example, Patent Documents). 1). This shearing S is made by sandwiching elastic elastic members 2, 2,..., Such as thread rubber, with a sheet 1 formed by laminating and fixing two or more breathable / water-repellent nonwoven fabrics, and elastic elastic members 2, 2,. The elastic elastic members 2, 2,... And the sheet 1 are intermittently fixed with an adhesive such as hot melt, and the elastic elastic members 2, 2,. is there. In FIG. 1, WO indicates a waist opening, and LO indicates a leg opening.
As a known technique for fixing the elastic elastic members 2, 2,... To the sheet 1 such as the nonwoven fabric, either the elastic elastic members 2, 2,. In general, an adhesive such as hot melt is applied to both the sheet 1 and then fixed by niping the elastic elastic members 2, 2.
Further, in recent years, an anvil roll (not shown) that is intermittently arranged and is constituted by a protrusion that becomes an adhesive surface, and a heat fusion device (not shown) arranged at a position facing the anvil roll (not shown). In addition, a technique is also introduced in which the sheet 1 is continuously supplied in a state in which the elastic elastic members 2, 2,... Are sandwiched and the sheet 1 and the elastic elastic members 2, 2,. .
JP 2002-172132 A JP 2004-330777 A

しかしながら、ホットメルト接着剤を使用する場合には、接着剤の接着力を一定に保つため接着剤の温度管理等の製造設備の煩雑化を招くと共に、ゴム等の弾性伸縮部材に塗着しなかった接着剤が加圧ロール、移設ベルト等の製造設備に塗着するため、製造設備の摺動部の抵抗を大きくする等のマシントラブルや製品への異物混入の原因となる虞があった。また、ホットメルトを溶解させるための熱（１５０〜２００℃）によって、機械部品が劣化したり、周辺気温の上昇を招いたりという弊害もあった。
一方、ホットメルト以外の接着剤は、揮発性の溶媒が人体に有害であったり、常温でも流動性があり十分な接着強度が発揮できなかったりするため、好ましくない。
また、紙おむつの製品として、接着剤により弾性伸縮部材と不織布を固着することにより伸縮部を形成する場合、伸縮部の通気性や柔らかさが失われるという問題もある。また、特許文献２記載の発明の挟み潰した状態で固定する方法では、ゴム等の弾性伸縮部材が劣化して、弾性伸縮部材の強度や伸縮性が低下してしまうという問題があった。
そこで、本発明の主たる課題は、接着剤を使用せずに弾性伸縮部材とシートを固定する伸縮部形成方法及びその設備を提供することにある。 However, when a hot melt adhesive is used, the adhesive strength of the adhesive is kept constant, resulting in complicated manufacturing equipment such as temperature control of the adhesive and not being applied to elastic elastic members such as rubber. In addition, since the adhesive is applied to manufacturing equipment such as a pressure roll and a transfer belt, there is a risk of causing machine troubles such as increasing the resistance of the sliding portion of the manufacturing equipment and mixing of foreign substances into the product. In addition, there is a problem that mechanical parts are deteriorated or the ambient temperature is increased by heat (150 to 200 ° C.) for dissolving the hot melt.
On the other hand, an adhesive other than hot melt is not preferable because a volatile solvent is harmful to the human body or it is fluid at room temperature and cannot exhibit sufficient adhesive strength.
Moreover, when a stretchable part is formed by fixing an elastic stretchable member and a nonwoven fabric with an adhesive as a product of a paper diaper, there is a problem that the breathability and softness of the stretchable part are lost. Moreover, in the method of fixing in the pinched state of the invention described in Patent Document 2, there is a problem that the elastic stretchable member such as rubber is deteriorated, and the strength and stretchability of the elastic stretchable member are lowered.
Then, the main subject of this invention is providing the expansion-contraction part formation method and its installation which fix an elastic expansion-contraction member and a sheet | seat, without using an adhesive agent.

上記課題を解決した本発明は、次のとおりである。
＜請求項１記載の発明＞
請求項１記載の発明は、内シートと外シートとの間に平行に並べた複数の弾性伸縮部材を挟み込んだ連続シートを用い、
前記内シートと外シートとを供給方向に対して間欠的に溶着することにより前記弾性伸縮部材を固定する、吸収性物品の伸縮部形成方法であって、
前記弾性伸縮部材に引張力をかけた状態で、前記弾性伸縮部材の直径方向の両側部近傍において、前記内シートと外シートとを前記供給方向に間欠的に溶着し、
その後に、前記内シートと外シートとの溶着部分によって閉鎖された断面空間内において、前記弾性伸縮部材に引張力を解放して前記弾性伸縮部材の断面外径を拡大させ、前記弾性伸縮部材の外面と前記閉鎖された空間を形成するシートとの摩擦力によって、前記弾性伸縮部材をシートに固定する、
ことを特徴とする伸縮部形成方法である。 The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Invention of Claim 1 uses the continuous sheet which pinched | interposed the several elastic elastic member arranged in parallel between the inner sheet | seat and the outer sheet | seat,
A method for forming a stretchable part of an absorbent article, wherein the elastic stretchable member is fixed by intermittently welding the inner sheet and the outer sheet in the supply direction,
With the tensile force applied to the elastic elastic member, in the vicinity of both sides in the diameter direction of the elastic elastic member , the inner sheet and the outer sheet are intermittently welded in the supply direction ,
Thereafter, in the cross-sectional space closed by the welded portion between the inner sheet and the outer sheet, the tensile force is released to the elastic elastic member to enlarge the cross-sectional outer diameter of the elastic elastic member, and the elastic elastic member The elastic elastic member is fixed to the sheet by a frictional force between an outer surface and the sheet forming the closed space .
This is a method for forming the stretchable part.

＜請求項２記載の発明＞
請求項２記載の発明は、内シートと外シートとの間に平行に並べた複数の弾性伸縮部材を挟み込んだ連続シートを用い、
前記内シートと外シートとを供給方向に対して間欠的に溶着することにより前記弾性伸縮部材を固定する、吸収性物品の伸縮部形成方法であって、
前記弾性伸縮部材に引張力をかけた状態で、前記弾性伸縮部材の直径方向の両側部近傍及び前記弾性伸縮部材と重なる両側部において、前記内シートと外シートとを前記供給方向に間欠的に溶着し、
その後に、前記内シートと外シートとの溶着部分によって閉鎖された断面空間内において、前記弾性伸縮部材に引張力を解放して前記弾性伸縮部材の断面外径を拡大させ、前記弾性伸縮部材の外面と前記閉鎖された空間を形成するシートとの摩擦力、並びに前記側部におけるシートとの接合力によって、前記弾性伸縮部材をシートに固定する、
ことを特徴とする伸縮部形成方法である。 <Invention of Claim 2>
Invention of Claim 2 uses the continuous sheet which pinched | interposed the some elastic elastic member arranged in parallel between the inner sheet | seat and the outer sheet | seat,
A method for forming a stretchable part of an absorbent article, wherein the elastic stretchable member is fixed by intermittently welding the inner sheet and the outer sheet in the supply direction,
In a state where a tensile force is applied to the elastic elastic member , the inner sheet and the outer sheet are intermittently provided in the supply direction in the vicinity of both sides in the diameter direction of the elastic elastic member and on both sides overlapping the elastic elastic member. Welded,
Thereafter, in the cross-sectional space closed by the welded portion between the inner sheet and the outer sheet, the tensile force is released to the elastic elastic member to enlarge the cross-sectional outer diameter of the elastic elastic member, and the elastic elastic member The elastic elastic member is fixed to the sheet by the frictional force between the outer surface and the sheet forming the closed space, and the bonding force between the sheet at the side part ,
This is a method for forming the stretchable part.

（作用効果）
弾性伸縮部材に引張力をかけた状態（伸張状態）で、弾性伸縮部材の直径方向の両側部近傍で前記内シートと外シートとを間欠的に溶着し、弾性伸縮部材をシートに固定することで、その後に負荷をなくすと（ノーテンション）、弾性伸縮部材の断面外径が大きくなり、内シートと外シートとの溶着部分により、相対的に弾性伸縮部材の直径方向を両側部から挟むように押圧力がかかるようになる。その結果、弾性伸縮部材を接着剤で固定することなく、シートとの摩擦力のみによって弾性伸縮部材が固定されるため、接着剤による劣化を防止することができる。また、弾性伸縮部材が接着されていないことにより、通気性や柔らかさが確保された伸縮部を形成することができる。溶着は、超音波溶着又は熱溶着とすることができる。ただし、弾性伸縮部材やシート周辺部に与える熱及び圧力の影響が熱溶着よりも超音波溶着の方が少ないため、超音波溶着を用いることがより好適である。
また、弾性伸縮部材に引張力をかけた状態で、弾性伸縮部材の直径方向の両側部と、前記内シート及び外シートとを間欠的に溶着し、弾性伸縮部材を固定することで、シートとの摩擦力に加えて弾性伸縮部材の直径方向の端部の溶着力によって弾性伸縮部材がより強固に固定される。なお、接合は弾性伸縮部材の直径方向の端部だけのため、弾性伸縮部材の劣化や切断の虞はない。 (Function and effect)
The inner and outer sheets are intermittently welded in the vicinity of both sides in the diameter direction of the elastic elastic member in a state where a tensile force is applied to the elastic elastic member (extension state), and the elastic elastic member is fixed to the sheet. in, the subsequent elimination of the load (no tension), outer cross-sectional diameter of the resilient and elastic members is increased, the welding portion between the inner sheet and the outer sheet, relatively to sandwich the radial direction of the resilient and elastic members from both sides A pressing force is applied to the. As a result, since the elastic elastic member is fixed only by the frictional force with the sheet without fixing the elastic elastic member with the adhesive, deterioration due to the adhesive can be prevented. Moreover, since the elastic elastic member is not bonded, an expansion / contraction part in which air permeability and softness are ensured can be formed. The welding can be ultrasonic welding or heat welding. However, it is more preferable to use ultrasonic welding because the influence of heat and pressure on the elastic elastic member and the peripheral portion of the sheet is less than that of ultrasonic welding.
Further, in a state in which a tensile force is applied to the elastic elastic member, both sides in the diameter direction of the elastic elastic member, the inner sheet and the outer sheet are intermittently welded, and the elastic elastic member is fixed, In addition to the frictional force, the elastic elastic member is more firmly fixed by the welding force of the end portion in the diameter direction of the elastic elastic member. In addition, since joining is only the edge part of the elastic elastic member in the diameter direction , there is no possibility of deterioration or cutting of the elastic elastic member.

＜請求項３記載の発明＞
請求項３記載の発明は、内シートと外シートとの間に平行に並べた複数の弾性伸縮部材を挟み込んだ連続シートを用い、
前記弾性伸縮部材に引張力をかけた状態で、前記内シートと外シートとを供給方向に対して間欠的に溶着することにより前記弾性伸縮部材を固定する、吸収性物品の伸縮部形成装置であって、
該装置は、超音波振動源と、この超音波振動源に連結されたホーンと、このホーンに対向配置されたアンビルロールと、を備え、
アンビルロールの外周面には、接着面となる複数の突起が形成され、
これら突起は格子状の配置で、かつアンビルロールの幅方向の突起と突起との間隔が、引張力をかけた状態の弾性伸縮部材の断面外径と略同じ長さに構成され、前記弾性伸縮部材は前記間隔内を通過し、内シートと外シートとの溶着部分によって前記弾性伸縮部材を包む閉鎖された断面空間構成するように構成されている、
ことを特徴とする伸縮部形成装置である。 <Invention of Claim 3>
Invention of Claim 3 uses the continuous sheet which pinched | interposed the several elastic elastic member arranged in parallel between the inner sheet | seat and the outer sheet | seat,
An apparatus for forming a stretchable part of an absorbent article, wherein the elastic stretchable member is fixed by intermittently welding the inner sheet and the outer sheet with respect to a supply direction in a state where a tensile force is applied to the elastic stretchable member. There,
The apparatus includes an ultrasonic vibration source, a horn connected to the ultrasonic vibration source, and an anvil roll disposed to face the horn.
On the outer peripheral surface of the anvil roll, there are formed a plurality of protrusions that become adhesive surfaces,
These protrusions are arranged in a lattice pattern , and the interval between the protrusions in the width direction of the anvil roll is configured to be substantially the same as the outer diameter of the cross section of the elastic stretchable member in a state where a tensile force is applied. The elastic member is configured to pass through the interval and constitute a closed sectional space that wraps the elastic elastic member by a welded portion between the inner sheet and the outer sheet.
It is an expansion-contraction part formation apparatus characterized by the above-mentioned.

＜請求項４記載の発明＞
請求項４記載の発明は、内シートと外シートとの間に平行に並べた複数の弾性伸縮部材を挟み込んだ連続シートを用い、
前記弾性伸縮部材に引張力をかけた状態で、前記内シートと外シートとを供給方向に対して間欠的に溶着することにより前記弾性伸縮部材を固定する、吸収性物品の伸縮部形成装置であって、
該装置は、超音波振動源と、この超音波振動源に連結されたホーンと、このホーンに対向配置されたアンビルロールと、を備え、
アンビルロールの外周面には、接着面となる複数の突起が形成され、
これら突起は前記外周線を跨いだ千鳥状で、かつアンビルロールの回転方向に対して斜め方向に隣接する突起と突起との幅方向の間隔が、引張力をかけた状態の弾性伸縮部材の断面外径と略同じ長さに構成され、前記弾性伸縮部材は前記間隔内を通過し、内シートと外シートとの溶着部分によって前記弾性伸縮部材を包む閉鎖された断面空間構成するように構成されている、
ことを特徴とする伸縮部形成装置である。 <Invention of Claim 4>
Invention of Claim 4 uses the continuous sheet which pinched | interposed the several elastic elastic member arranged in parallel between the inner sheet | seat and the outer sheet | seat,
An apparatus for forming a stretchable part of an absorbent article, wherein the elastic stretchable member is fixed by intermittently welding the inner sheet and the outer sheet with respect to a supply direction in a state where a tensile force is applied to the elastic stretchable member. There,
The apparatus includes an ultrasonic vibration source, a horn connected to the ultrasonic vibration source, and an anvil roll disposed to face the horn.
On the outer peripheral surface of the anvil roll, there are formed a plurality of protrusions that become adhesive surfaces,
These protrusions are staggered across the outer circumferential line , and the cross section of the elastic elastic member in the state where the protrusions adjacent to each other in the oblique direction with respect to the rotation direction of the anvil roll are applied with a tensile force. The elastic stretchable member is configured to have substantially the same length as the outer diameter, and the elastic stretchable member is configured to pass through the gap and form a closed cross-sectional space that wraps the elastic stretchable member by a welded portion between the inner sheet and the outer sheet. Being
It is an expansion-contraction part formation apparatus characterized by the above-mentioned.

（作用効果）
アンビルロールの外周面には、接着面となる複数の突起が形成され、これら突起は格子状で、かつアンビルロールの直径方向の突起と突起との間隔が、引張力をかけた状態の弾性伸縮部材の断面外径と略同じ長さに構成されたことにより、弾性伸縮部材全体又は主要部分がアンビルロールの突起と突起との間の溝に収められた状態で、連続シートの内外シートが狭圧されて突起とホーンによって超音波溶着する。その結果、弾性伸縮部材全体が溝に収められた状態の場合には、接着剤を使用することなく、シートとの摩擦力のみによって弾性伸縮部材が固定されるようになり、また、弾性伸縮部材の主要部分が溝に収められ、直径方向の両側部がホーンと突起によって狭圧された状態の場合には、シートとの摩擦力に加えて弾性伸縮部材の直径方向の端部の接合力によって弾性伸縮部材が固定されるようになる。
アンビルロールの外周面には、接着面となる複数の突起が形成され、これら突起は千鳥状で、かつアンビルロールの回転方向に対して斜め方向に隣接する突起と突起との直径方向の間隔が、引張力をかけた状態の弾性伸縮部材の断面外径と略同じ長さに構成されても、上記と同様の効果が得られる。 (Function and effect)
On the outer peripheral surface of the anvil roll, there are formed a plurality of protrusions that become adhesive surfaces, and these protrusions are in a lattice shape, and the elastic protrusions in the state where the protrusions in the diametrical direction of the anvil roll are subjected to a tensile force. By configuring the length approximately the same as the cross-sectional outer diameter of the member, the inner and outer sheets of the continuous sheet are narrow in a state where the entire elastic stretchable member or the main part is stored in the groove between the protrusions of the anvil roll. It is pressed and ultrasonically welded by the projection and horn. As a result, when the entire elastic expansion / contraction member is in the groove, the elastic expansion / contraction member is fixed only by the frictional force with the sheet without using an adhesive, and the elastic expansion / contraction member In the case where the main part of the elastic member is housed in the groove and both sides in the diametrical direction are constricted by the horn and the protrusion, in addition to the frictional force with the sheet, the joining force at the diametrical end of the elastic elastic member An elastic elastic member comes to be fixed.
On the outer peripheral surface of the anvil roll, a plurality of protrusions that are adhesive surfaces are formed.The protrusions are staggered, and the diametric spacing between the protrusions adjacent to each other in an oblique direction with respect to the rotation direction of the anvil roll is set. The same effect as described above can be obtained even if the elastic stretchable member in a state where a tensile force is applied has the same length as the cross-sectional outer diameter.

本発明によれば、伸縮部において、接着剤を使用せずに弾性伸縮部材とシートを固定することができる等の利点がもたらされる。   According to the present invention, the elastic part and the sheet can be fixed without using an adhesive in the elastic part.

以下、本発明の実施の形態を説明する。
本発明に係る伸縮部形成装置は、図３に示すように、超音波振動源２０と、この超音波振動源２０に連結され、超音波振動源２０からの振動振幅を増大させるホーン２１と、このホーン２１に対向配置されたアンビルロール２２と、を備えている。超音波振動源２０は加圧アーム（図示せず）に固定されており、高さ調節が可能となっている。また、アンビルロール２２の前後には、弾性伸縮部材２，２，…を不織布で挟み込んだ状態の連続シート１０の弛み等の防止ためのガイドロールが配設されている。
また、図示していないが、弾性伸縮部材２，２，…を不織布で挟み込んだ状態の連続シート１０の弛み等の防止ため、ガイドロールの側外方には、連続シート１０の張力を一定に保つため、段差ロール等の張力コントロールを用いることがより好適である。 Embodiments of the present invention will be described below.
As shown in FIG. 3, the stretchable part forming apparatus according to the present invention includes an ultrasonic vibration source 20, a horn 21 that is connected to the ultrasonic vibration source 20 and increases the vibration amplitude from the ultrasonic vibration source 20, An anvil roll 22 disposed opposite to the horn 21. The ultrasonic vibration source 20 is fixed to a pressure arm (not shown), and the height can be adjusted. Further, before and after the anvil roll 22, guide rolls for preventing loosening of the continuous sheet 10 in a state where the elastic elastic members 2, 2,.
Although not shown, the tension of the continuous sheet 10 is kept constant on the outer side of the guide roll in order to prevent the continuous sheet 10 in a state where the elastic elastic members 2, 2,. In order to maintain, it is more preferable to use tension control such as a step roll.

連続シート１０は、２枚または３枚以上の通気・撥水性の不織布を積層固定してなるものであって、その内シート１Ａと外シート１Ｂとの間には、平行に並べた複数の弾性伸縮部材２，２，…を挟み込んである。不織布は、ポリプロピレン樹脂（ＰＰ）、ポリエチレン樹脂（ＰＥ）、ポリエチレンテレフタレート樹脂（ＰＥＴ）やこれらを複合したもの等を用いることができる。さらに、連続シート１０は不織布に限られず、熱溶着や超音波溶着にて固着できるものであれば、ポリエチレン樹脂等からなるフィルムを用いることもでき、不織布とフィルムとを組合せて用いることもできる。   The continuous sheet 10 is formed by laminating and fixing two or three or more breathable / water-repellent nonwoven fabrics, and a plurality of elastic sheets arranged in parallel between the inner sheet 1A and the outer sheet 1B. The elastic members 2, 2,. As the nonwoven fabric, a polypropylene resin (PP), a polyethylene resin (PE), a polyethylene terephthalate resin (PET), a composite of these, or the like can be used. Furthermore, the continuous sheet 10 is not limited to a nonwoven fabric, and a film made of a polyethylene resin or the like can be used as long as it can be fixed by heat welding or ultrasonic welding, and a nonwoven fabric and a film can be used in combination.

また、弾性伸縮部材２は、弾性性質を備え、かつ取り囲む不織布とともに張力がかかった状態で固定できるものであれば、公知の弾性糸を用いることができる。材質としては、天然ゴム、ポリウレタン、ブロックポリエーテルアミド、ブロックポリエーテルエステル、ポリウレタン尿素、弾性ポリオレフィン、熱可塑性スチレン−ブタジエン−スチレン（ＳＢＳ）、スチレン−イソプレン−スチレン、スチレン−エチレン／プロピレン−スチレン、スチレン−エチレン−ブタジエン−スチレン（ＳＥＢＳ）、水素添加スチレン−ブタジエン−ゴムならびにこれらと他のポリマー、例えばポリスチレンまたはポリオレフィンとの混合物を基礎とするエラストマー等を用いることができる。また、セグメント化されたポリエステルもしくはポリエーテルウレタン−尿素からの弾性糸も使用できる。   Moreover, the elastic elastic member 2 can use a well-known elastic yarn, if it has an elastic property and can be fixed in tension with the surrounding nonwoven fabric. Materials include natural rubber, polyurethane, block polyether amide, block polyether ester, polyurethane urea, elastic polyolefin, thermoplastic styrene-butadiene-styrene (SBS), styrene-isoprene-styrene, styrene-ethylene / propylene-styrene, Styrene-ethylene-butadiene-styrene (SEBS), hydrogenated styrene-butadiene-rubber and elastomers based on these and other polymers such as polystyrene or polyolefins can be used. Also, elastic yarns from segmented polyester or polyether urethane-urea can be used.

弾性伸縮部材２の太さは、任意に設定できる。また、断面形状は円形だけでなく、楕円、矩形、その他の幾何学的形状など、自由に選択できる。
さらに、弾性伸縮部材２は糸状のものに限られず、図示はしないが、幅広なリボン状やネット形状のものも採用できる。リボン状の場合は、直径方向の両側部が内外シートともにシートに溶着されるのが好ましい。ネット状の場合は、引張方向の弾性糸だけでなく、それと直交する弾性糸についても直径方向の両側部近傍において内外シートを溶着したほうが好ましい。この場合、直交する弾性糸と溶着部は離れていてもよいが、溶着部が弾性糸の直径方向の両側部だけでなく中央部まで溶着すると、弾性糸が切れたり溶着部が硬くなったりする虞があるため好ましくない。 The thickness of the elastic elastic member 2 can be arbitrarily set. Further, the cross-sectional shape is not limited to a circle, but can be freely selected from an ellipse, a rectangle, and other geometric shapes.
Furthermore, the elastic elastic member 2 is not limited to a thread-like one, and although not shown, a wide ribbon-like or net-shaped one can also be employed. In the case of a ribbon, it is preferable that both sides in the diameter direction are welded to the sheet together with the inner and outer sheets. In the case of the net shape, it is preferable to weld the inner and outer sheets not only on the elastic yarn in the tensile direction but also on the elastic yarn orthogonal to the tensile yarn in the vicinity of both sides in the diameter direction . In this case, the orthogonal elastic yarn and the welded portion may be separated from each other, but if the welded portion is welded not only to both sides in the diameter direction of the elastic yarn but also to the central portion, the elastic yarn breaks or the welded portion becomes hard. Since there is a possibility, it is not preferable.

アンビルロール２２の外周面には、図４（１）及び（２）に示すように、超音波溶着の溶着面となる複数の突起２２Ａ，２２Ａ，…が形成されており、これらの突起２２Ａ，２２Ａ，…間には所定の深さを有する溝が形成されている。ホーン２１とアンビルロール２２の突起２２Ａとが連続シート１０を挟圧し、図５（１）及び（２）に示すように、連続シート１０の内シート１Ａと外シート１Ｂとを溶着部３により溶着するが、突起２２Ａと突起２２Ａとの間に形成された溝部分では融着せず、折り重ねた連続シート１０には間隙が形成される。なお、図では上部に内シート１Ａ、下部に外シート１Ｂが位置しているが、下部に内シート１Ａ、上部に外シート１Ｂを位置させてもよい。この点については、以下同様である。   As shown in FIGS. 4 (1) and (2), the anvil roll 22 has a plurality of projections 22A, 22A,... That serve as ultrasonic welding surfaces. A groove having a predetermined depth is formed between 22A,. The horn 21 and the protrusion 22A of the anvil roll 22 pinch the continuous sheet 10, and the inner sheet 1A and the outer sheet 1B of the continuous sheet 10 are welded by the welding portion 3 as shown in FIGS. 5 (1) and (2). However, the groove portion formed between the protrusions 22A and 22A is not fused, and a gap is formed in the folded continuous sheet 10. In the figure, the inner sheet 1A is located at the upper part and the outer sheet 1B is located at the lower part. However, the inner sheet 1A may be located at the lower part and the outer sheet 1B may be located at the upper part. The same applies to this point.

アンビルロール２２の軸方向の突起２２Ａと突起２２Ａとの間隔は、図４（１）及び（２）に示すように、長手方向に引張力をかけた状態の弾性伸縮部材２の断面外径（幅）と略同じ長さに形成されているのが好適である。紙おむつにおいては、弾性伸縮部材として、４００〜１０００デシテックス程度の太さのポリウレタン糸ゴムを２〜３倍に伸張させた状態でシートに固定することが一般的であるが、この範囲では引っ張った状態での弾性伸縮部材２の断面外径はおよそ０．１８〜０．２２ｍｍであり、突起２２Ａ，２２Ａ，…の間隔は、その０．９〜１．１倍に設定するのが好ましい。より好適には、長手方向に引っ張った状態の弾性伸縮部材２の断面外径の０．９〜１倍（１を含まず）とするのが好ましい。 As shown in FIGS. 4 (1) and (2), the space between the axial projection 22A and the projection 22A of the anvil roll 22 is the cross-sectional outer diameter of the elastic elastic member 2 in a state where a tensile force is applied in the longitudinal direction ( It is preferable that the length is substantially the same as the width. In a paper diaper, it is common to fix a polyurethane thread rubber having a thickness of about 400 to 1000 decitex as an elastic stretch member to a sheet in a stretched state 2 to 3 times. The outer diameter of the elastic elastic member 2 is about 0.18 to 0.22 mm, and the interval between the protrusions 22A, 22A,. More preferably, it is preferably 0.9 to 1 times (excluding 1) the outer diameter of the cross section of the elastic elastic member 2 in a state pulled in the longitudinal direction.

図４（１）及び（２）に示すように、突起２２Ａ，２２Ａ，…間の溝は、弾性伸縮部材２が突起によって狭圧されないように、弾性伸縮部材２を収めるためのものである。したがって、隣接する溝の間隔は連続シート１０における隣接する弾性伸縮部材２，２，…の配置間隔と一致している。また、突起２２Ａ，２２Ａ，…間の溝の深さは、弾性伸縮部材２を収めることが可能な深さで、かつ連続シート１０がたるみ過ぎない程度の深さでよい。
図４（１）及び（２）に示すように、突起２２Ａを格子状に配置し、かつアンビルロール２２の軸方向の突起２２Ａと突起２２Ａとの間隔を、長手方向に引張力の負荷をかけた状態の弾性伸縮部材２の断面外径の１〜１．１倍とした場合、突起２２Ａを格子状に配置したアンビルロール２２とホーン２１との間に導かれると、弾性伸縮部材２が溝に収まった状態で、連続シート１０の内シート１Ａと外シート１Ｂとが狭圧されて突起２２Ａとホーン２１によって超音波溶着する。当然のことながら、弾性伸縮部材２が溝に収まっているので、張力のかかった弾性伸縮部材２は突起２２とホーン２１によって狭圧されることはない。 As shown in FIGS. 4 (1) and (2), the grooves between the protrusions 22A, 22A,... Are for accommodating the elastic elastic member 2 so that the elastic elastic member 2 is not narrowed by the protrusions. Therefore, the space | interval of an adjacent groove | channel corresponds with the arrangement | positioning space | interval of the elastic elastic members 2, 2, ... which adjoin in the continuous sheet 10. FIG. Further, the depth of the groove between the protrusions 22A, 22A,... May be deep enough to accommodate the elastic elastic member 2 and deep enough that the continuous sheet 10 does not sag too much.
As shown in FIGS. 4 (1) and (2), the protrusions 22A are arranged in a lattice pattern, and the space between the protrusions 22A and 22A in the axial direction of the anvil roll 22 is applied with a tensile force in the longitudinal direction. When the outer diameter of the elastic elastic member 2 is 1 to 1.1 times the outer diameter of the elastic elastic member 2, the elastic elastic member 2 is grooved when guided between the horn 21 and the anvil roll 22 in which the protrusions 22A are arranged in a lattice shape. The inner sheet 1 </ b> A and the outer sheet 1 </ b> B of the continuous sheet 10 are narrowed and are ultrasonically welded by the protrusion 22 </ b> A and the horn 21. As a matter of course, since the elastic elastic member 2 is received in the groove, the elastic elastic member 2 under tension is not narrowed by the protrusion 22 and the horn 21.

この溶着は、図５（１）及び（２）に示すように、弾性伸縮部材２に張力がかけられた状態で、かつ弾性伸縮部材２の直径方向の両側部近傍で行なわれるため、その後に、負荷をなくすと（ノーテンション）、図６（１）及び（２）に示すように、弾性伸縮部材２の断面外径が大きくなり、内シート１Ａと外シート１Ｂとの溶着部３により弾性伸縮部材２の直径方向を両側部から挟むように押圧力がかかるようになる。その結果、接着剤を使用することなく、内外シート１Ａ，１Ｂとの摩擦力のみによって弾性伸縮部材２が固定されるようになる。
これにより、弾性伸縮部材２の接着剤による劣化を防止することができる。また、弾性伸縮部材２が接着されていないことにより、通気性や柔らかさが確保されたシャーリングＳを形成することができる。また、素材自体を溶かして溶着するため、ホットメルトの変動費を低減できると共に、ホットメルトに起因するマシントラブルを防止することができる。
さらに、弾性伸縮部材とシートから構成されるバリヤカフス、ガスケットカフス等にも本発明を適用し、シートへの弾性伸縮部材の固定を行うことができるのは言うまでもない。 As shown in FIGS. 5 (1) and (2), this welding is performed in a state where tension is applied to the elastic elastic member 2 and in the vicinity of both sides in the diametrical direction of the elastic elastic member 2. When the load is removed (no tension), as shown in FIGS. 6 (1) and (2), the cross-sectional outer diameter of the elastic stretchable member 2 is increased, and the welded portion 3 between the inner sheet 1A and the outer sheet 1B is elastic. A pressing force is applied so as to sandwich the diameter direction of the elastic member 2 from both sides. As a result, the elastic elastic member 2 is fixed only by the frictional force with the inner and outer sheets 1A and 1B without using an adhesive.
Thereby, deterioration by the adhesive of the elastic elastic member 2 can be prevented. Moreover, since the elastic elastic member 2 is not bonded, the shearing S in which air permeability and softness are ensured can be formed. In addition, since the material itself is melted and welded , the fluctuation cost of hot melt can be reduced, and machine troubles caused by hot melt can be prevented.
Furthermore, it goes without saying that the present invention can be applied to barrier cuffs, gasket cuffs and the like composed of an elastic elastic member and a sheet, and the elastic elastic member can be fixed to the sheet.

また、図７（１）及び（２）に示すように、アンビルロール２２の突起２２Ｂを格子状に配置し、かつアンビルロール２２の軸方向の突起２２Ｂと突起２２Ｂとの間隔を、長手方向に引張力の負荷をかけた状態の弾性伸縮部材２の断面外径の０．９〜１倍（１を含まず）とした場合では、弾性伸縮部材２の直径方向の両側部がホーン２１と突起２２Ｂによって狭圧され、図８（１）及び（２）に示すように、内シート１Ａと外シート１Ｂと共に溶着部３により超音波溶着される。この場合には、図９（１）及び（２）に示すように、負荷をなくすと（ノーテンション）、内外シート１Ａ，１Ｂとの摩擦力に加えて弾性伸縮部材２の直径方向の両側部の溶着力によって弾性伸縮部材２が固定されるようになる。ここで、溶着は弾性伸縮部材２の端部だけのため、通常の場合、弾性伸縮部材２の劣化や切断の虞は殆どない。 Further, as shown in FIGS. 7A and 7B, the protrusions 22B of the anvil roll 22 are arranged in a lattice shape, and the distance between the protrusions 22B and 22B in the axial direction of the anvil roll 22 is set in the longitudinal direction. In the case of 0.9 to 1 times (excluding 1) the cross-sectional outer diameter of the elastic elastic member 2 in a state where a tensile force is applied, both diametrical side portions of the elastic elastic member 2 have horns 21 and protrusions. The pressure is narrowed by 22B, and ultrasonic welding is performed by the welding portion 3 together with the inner sheet 1A and the outer sheet 1B, as shown in FIGS. In this case, as shown in FIGS. 9 (1) and 9 (2), when the load is eliminated (no tension), in addition to the frictional force with the inner and outer sheets 1A and 1B, both sides of the elastic elastic member 2 in the diametrical direction The elastic elastic member 2 is fixed by the welding force. Here, since the welding is performed only at the end portion of the elastic elastic member 2, there is almost no risk of deterioration or cutting of the elastic elastic member 2 in a normal case.

突起の配置は格子状に限らず、図１０に示すように、千鳥状の配列の突起２２Ｃにしてもよい。このとき、アンビルロール２２の回転方向に対して斜め方向に隣接する突起２２Ｃと突起２２Ｃとの直径方向の間隔を、長手方向に引張力の負荷をかけた状態の弾性伸縮部材２の断面外径の１〜１．１倍とした場合には、接着剤を使用することなく、内外シート１Ａ，１Ｂとの摩擦力のみによって弾性伸縮部材２が固定されるようになる。また、長手方向に引張力の負荷をかけた状態の弾性伸縮部材２の断面外径の０．９〜１倍（１を含まず）とした場合には、内外シート１Ａ，１Ｂとの摩擦力に加えて弾性伸縮部材２の直径方向の両側部の溶着力によって弾性伸縮部材２が固定されるようになる。 The arrangement of the protrusions is not limited to the lattice shape, and may be a staggered array of protrusions 22C as shown in FIG. At this time, the protrusion 22C and the distance in the diameter direction and the projection 22C, outer cross-sectional diameter of the resilient and elastic members 2 in a state where a load of tensile force in the longitudinal direction adjacent in an oblique direction with respect to the rotational direction of the anvil roll 22 1 to 1.1 times, the elastic elastic member 2 is fixed only by the frictional force between the inner and outer sheets 1A and 1B without using an adhesive. In addition, when the elastic elastic member 2 is applied with a tensile force in the longitudinal direction and has an outer diameter of 0.9 to 1 (excluding 1), the frictional force between the inner and outer sheets 1A and 1B. In addition to this, the elastic elastic member 2 is fixed by the welding force of the both sides in the diameter direction of the elastic elastic member 2.

なお、突起２２Ａ〜２２Ｃと突起２２Ａ〜２２Ｃとの直径方向の間隔（溝幅）が引張力をかけた状態の弾性伸縮部材の断面外径に対して上記範囲内にあれば、アンビルロール２２の突起２２Ａ〜２２Ｃの配列パターンは格子状や千鳥状に限られず、他のパターンでもよい。
また、溝幅を伸張状態の弾性伸縮部材２の断面外径の０．９〜１倍（１を含まず）として弾性伸縮部材２を溶着固定すると、弾性伸縮部材２の保持力は非常に高いため好ましいが、伸長率が高い場合には弾性伸縮部材２が切断し易くなるため注意を要する。特に伸長率が３００％以上の場合には溝幅を０．９〜１倍（１を含まず）とするのは好ましくない。 In addition, if the space | interval (groove width) of the diameter direction of protrusion 22A-22C and protrusion 22A-22C is in the said range with respect to the cross-section outer diameter of the elastic expansion-contraction member in the state which applied the tensile force, The arrangement pattern of the protrusions 22A to 22C is not limited to a lattice shape or a zigzag shape, and may be another pattern.
In addition, when the elastic elastic member 2 is welded and fixed with the groove width being 0.9 to 1 times the outer diameter of the elastic elastic member 2 in an expanded state (not including 1), the holding force of the elastic elastic member 2 is very high. Therefore, it is preferable, however, when the elongation rate is high, the elastic elastic member 2 is easily cut, so care should be taken. In particular, when the elongation rate is 300% or more, it is not preferable to make the groove width 0.9 to 1 time (not including 1).

また、弾性伸縮部材２を溶着せずに摩擦力のみで固定する場合、弾性伸縮部材２やシート１Ａ，１Ｂの摩擦抵抗が高い場合や、弾性伸縮部材２の伸長率が低い場合には、溝幅を伸張状態の弾性伸縮部材２の断面外径の１．３倍程度まで広げることができるが、通常の場合１．０〜１．２倍が好ましく、１．０〜１．１倍が特に好ましい。この場合、１倍に近いほど保持力（摩擦抵抗）は高くなるが、弾性伸縮部材２の切断の恐れもある。なお、溝幅は、上記範囲にあると共に、弾性伸縮部材２の弛緩時の径より狭いことが必要であるのは言うまでもない。確実に保持力を発揮させる上では、溝幅は弾性伸縮部材２の弛緩時の径の７０％以下であることが望ましい。   Further, when the elastic elastic member 2 is fixed only by frictional force without welding, when the elastic elastic member 2 and the sheets 1A and 1B have high frictional resistance, or when the elastic elastic member 2 has a low elongation rate, the groove Although the width can be expanded to about 1.3 times the cross-sectional outer diameter of the elastic elastic member 2 in the stretched state, 1.0 to 1.2 times is preferable in a normal case, and 1.0 to 1.1 times is particularly preferable. preferable. In this case, the holding force (friction resistance) becomes higher as it becomes closer to 1 time, but there is a risk of the elastic elastic member 2 being cut. Needless to say, the groove width needs to be in the above range and narrower than the diameter of the elastic elastic member 2 at the time of relaxation. In order to ensure the holding force, the groove width is desirably 70% or less of the relaxed diameter of the elastic elastic member 2.

溝の深さ（突起２２Ａ〜２２Ｃの高さ）も、溝幅と同様の寸法にあることが望ましい。具体的には、溝の深さは伸張状態の弾性伸縮部材２の断面外径寸法の０．９〜１．２倍が好ましい。最も好ましいのは１．０〜１．１倍の範囲である。１．０倍より小さいと弾性伸縮部材２を保持する力は強くなるが、弾性伸縮部材２全体が溶着してしまう恐れがある。また、溝の深さが弛緩時の弾性伸縮部材２の断面外径寸法よりも大きくなるのは好ましくない。シート１Ａ，１Ｂが不織布のようにＣＤ方向（アンビルロールの軸方向）に歪みやすい性質をもつものである場合、溝が深すぎると、シート１Ａ，１Ｂが挟圧時に伸ばされて歪んでしまい、弾性伸縮部材２を挟持する力が十分に得られなくなるおそれがある。   It is desirable that the depth of the groove (the height of the protrusions 22A to 22C) is the same as the groove width. Specifically, the depth of the groove is preferably 0.9 to 1.2 times the outer cross-sectional dimension of the stretched elastic elastic member 2. The most preferable range is 1.0 to 1.1 times. If it is smaller than 1.0 times, the force for holding the elastic elastic member 2 becomes strong, but the entire elastic elastic member 2 may be welded. Further, it is not preferable that the depth of the groove is larger than the cross-sectional outer diameter of the elastic elastic member 2 when relaxed. When the sheets 1A and 1B have the property of being easily distorted in the CD direction (axial direction of the anvil roll) like a nonwoven fabric, if the groove is too deep, the sheets 1A and 1B are stretched and distorted during pinching, There is a possibility that the force for holding the elastic elastic member 2 cannot be obtained sufficiently.

また、個々の突起２２Ａ〜２２Ｃの形状は、図示例では円形だが、三角形や四角形等の多角形、楕円や星、ハートといった図柄であってもよい。円形や楕円などの角のない形状を用いれば、柔らかい風合いを得ることができる。角のある形状を用い、角が弾性伸縮部材２に対向するように配置すれば、弾性伸縮部材２の引き込み（弾性伸縮部材２がシート１Ａ，１Ｂにより固定されずにズレながら収縮してしまう現象）をより確実に防止できる。この場合、弾性伸縮部材２に対向する角が鋭角であるほど引き込みが少なくなる。弾性伸縮部材２に対向する角の角度は１５〜１２０度であるのが好ましく、特に３０〜９０度であるのが好ましい。   In addition, the shape of each of the protrusions 22A to 22C is circular in the illustrated example, but may be a polygonal shape such as a triangle or a quadrangle, or a pattern such as an ellipse, a star, or a heart. If a shape without corners such as a circle or an ellipse is used, a soft texture can be obtained. If a shape with a corner is used and the corner is disposed so as to face the elastic elastic member 2, the elastic elastic member 2 is retracted (the elastic elastic member 2 contracts while being displaced without being fixed by the sheets 1A and 1B). ) Can be prevented more reliably. In this case, the smaller the angle facing the elastic elastic member 2 is, the smaller the pull-in is. The angle of the angle facing the elastic elastic member 2 is preferably 15 to 120 degrees, and particularly preferably 30 to 90 degrees.

突起２２Ａ〜２２Ｃの大きさは、円形の場合は直径が０．２〜１０ｍｍであるのが好ましく、０．３〜５ｍｍであるのがより好ましく、０．３〜１ｍｍであるのが特に好ましく、０．３〜０．６ｍｍであるのが最も好ましい。直径は小さいほどシートの風合いが向上するが、小さ過ぎるとシート１Ａ，１Ｂ同士の接合強度が十分得られない。逆に、突起２２Ａ〜２２Ｃが大き過ぎると風合いが低下する。その他の形状に関しては、円形の場合の面積を基準として設定すればよく、縦横の寸法比が極端に異なるものであってもよい。突起２２Ａ〜２２Ｃの先端面の面積は０．０３〜８０ｍｍ2であるのが好ましく、０．０７〜２０ｍｍ2であるのがより好ましく、０．０７〜０．８ｍｍ2であるのが特に好ましく、０．０７〜０．３ｍｍ2であるのが最も好ましい。 In the case of a circle, the size of the protrusions 22A to 22C is preferably 0.2 to 10 mm, more preferably 0.3 to 5 mm, and particularly preferably 0.3 to 1 mm. Most preferably, it is 0.3 to 0.6 mm. The smaller the diameter, the better the texture of the sheet. However, if it is too small, the bonding strength between the sheets 1A and 1B cannot be sufficiently obtained. Conversely, when the protrusions 22A to 22C are too large, the texture is lowered. For other shapes, the area in the case of a circle may be set as a reference, and the dimensional ratio between length and width may be extremely different. Area of the tip surface of the projection 22A~22C is preferably a 0.03~80mm 2, more preferably from 0.07~20mm 2, particularly preferably in the range of 0.07~0.8mm 2, Most preferably, it is 0.07 to 0.3 mm 2 .

ＭＤ方向（アンビルロールの周方向、弾性伸縮部材２の長手方向）における突起２２Ａ〜２２Ｃの間隔は、一般的に０．３〜２０ｍｍ程度とすることができるが、特にこれに限定されるものではなく、突起２２Ａ〜２２ＣがＭＤ方向に条状（線状）に連続したものであってもよい。シート１Ａ，１Ｂの風合いとシート１Ａ，１Ｂ同士の接着強度と弾性伸縮部材２の固定のバランスを取るならば、例えば突起２２Ａ〜２２Ｃが直径０．３〜０．６ｍｍの円形状であるならば、突起２２Ａ〜２２Ｃの間隔は、例えばＭＤ方向に０．３〜１．０ｍｍ程度、ＣＤ方向（アンビルロールの軸方向）に０．３〜１．５ｍｍ程度とすればよい。なお、突起４Ａ〜４ＣのＭＤ方向の間隔及びＣＤ方向の間隔は、図１１中にそれぞれ符号ＤＭＤ及びＤＣＤにより示されている。   The spacing between the protrusions 22A to 22C in the MD direction (the circumferential direction of the anvil roll and the longitudinal direction of the elastic elastic member 2) can be generally about 0.3 to 20 mm, but is not particularly limited thereto. Alternatively, the protrusions 22A to 22C may be continuous in the MD direction in a strip shape (linear shape). In order to balance the texture of the sheets 1A and 1B, the adhesive strength between the sheets 1A and 1B, and the fixation of the elastic elastic member 2, for example, if the protrusions 22A to 22C have a circular shape with a diameter of 0.3 to 0.6 mm. The intervals between the protrusions 22A to 22C may be, for example, about 0.3 to 1.0 mm in the MD direction and about 0.3 to 1.5 mm in the CD direction (axial direction of the anvil roll). Note that the spacing in the MD direction and the spacing in the CD direction of the protrusions 4A to 4C are indicated by reference numerals DMD and DCD, respectively, in FIG.

突起２２Ａ〜２２Ｃの配列を上記格子配列とすると、弾性伸縮部材２の長手方向に同一の部位においてその直径方向両側に突起２２Ａ〜２２Ｃが位置するため、高い保持力が得られる。ただし、弾性伸縮部材２が溶着あるいは切断されるリスクも高くなる。これに対して、上記千鳥配列とすると、弾性伸縮部材２が溶着あるいは切断されるリスクは低下するが、保持力も低下する。千鳥配列は、ＭＤ方向に所定の周期間隔で並ぶ突起の列がＣＤ方向に所定の間隔を空けて設けられるとともに、各列における突起の配置周期の位相が隣接列に対してずれているものであり、図示例のように隣接する突起列に対して位相を１／２ずらすように配置してもよいが、より格子配列に近い配置とするために、例えば位相を１／４ずらした配置にしてもよい。位相のずれを０〜１／４の間で調整することにより、弾性伸縮部材２の保持力と切断回避とのバランスを取ることができる。 When the arrangement of the protrusions 22A to 22C is the above-described lattice arrangement, the protrusions 22A to 22C are located on both sides in the diameter direction at the same portion in the longitudinal direction of the elastic elastic member 2, so that a high holding force is obtained. However, the risk that the elastic elastic member 2 is welded or cut increases. On the other hand, when the zigzag arrangement is used, the risk that the elastic elastic member 2 is welded or cut is reduced, but the holding force is also reduced. In the staggered arrangement, the rows of protrusions arranged in the MD direction at a predetermined periodic interval are provided with a predetermined interval in the CD direction, and the phase of the arrangement period of the protrusions in each row is shifted from the adjacent row. Yes, it may be arranged so that the phase is shifted by 1/2 with respect to the adjacent protrusion rows as shown in the example, but in order to make it closer to the lattice arrangement, for example, the phase is shifted by 1/4. May be. By adjusting the phase shift between 0 and 1/4, it is possible to balance the holding force of the elastic elastic member 2 and the avoidance of cutting.

弾性伸縮部材２の固定領域における、全面積に対する溶着部３の面積率は、柔らかい風合いを得るためには４０％以下であるのが好ましく、３０％以下であるのが特に好ましく、２０％以下であるのが最も好ましい。また、弾性伸縮部材２の非固定領域では、シート１Ａ，１Ｂの貼り合せ強度を維持するため、溶着部３の面積の割合は少なくとも２％は必要である。弾性伸縮部材２の固定領域においては、弾性伸縮部材２の収縮によりシートが撓むため、弾性伸縮部材２の非固定領域以上の貼り合せ強度が必要である。従って、弾性伸縮部材２の固定領域においては、溶着部３の面積の割合は５％以上が好ましく、１０％以上がより好ましい。   In order to obtain a soft texture, the area ratio of the welded portion 3 in the fixed region of the elastic elastic member 2 is preferably 40% or less, particularly preferably 30% or less, and 20% or less. Most preferably. Further, in the non-fixed region of the elastic elastic member 2, the area ratio of the welded portion 3 needs to be at least 2% in order to maintain the bonding strength of the sheets 1A and 1B. In the fixed region of the elastic elastic member 2, the sheet bends due to the contraction of the elastic elastic member 2, so that a bonding strength equal to or higher than the non-fixed region of the elastic elastic member 2 is required. Therefore, in the fixed region of the elastic elastic member 2, the area ratio of the welded portion 3 is preferably 5% or more, and more preferably 10% or more.

本発明に係る伸縮シート形成方法及びその設備は、パンツ型の紙おむつにおけるシャーリングやバリヤカフス、ガスケットカフス等の伸縮部に限らず、テープ式の紙おむつのウエストギャザーやバリヤカフス、ガスケットカフス、伸縮テープ等の伸縮部形成にも適用でき、また、ナプキン等をも含む吸収性物品一般のバリヤカフス、ガスケットカフスなどの伸縮部形成にも適用できる。   The stretchable sheet forming method and its equipment according to the present invention are not limited to stretchable parts such as shirring and barrier cuffs and gasket cuffs in pant-type paper diapers, but also stretchable such as waist gathers, barrier cuffs, gasket cuffs and stretchable tapes of tape-type paper diapers. The present invention can also be applied to the formation of parts, and can also be applied to the formation of stretchable parts such as barrier cuffs and gasket cuffs in general absorbent articles including napkins and the like.

図１１は、パンツ型の紙おむつの胴回りにおけるシャーリング形成に用いられる弾性伸縮部材２に対して本発明を適用する場合を示している。図示形態では、直径方向中央部（排泄物を吸収し保持する吸収体を有する部分と重なる部分）で、背側の弾性伸縮部材２及び／又は腹側の弾性伸縮部材２を切断するか又は設けないようにしているが、直径方向一端部から他端部まで連続させても良い。この胴回り部のように、ある程度広範囲にわたり弾性伸縮部材２を設ける場合、溶着部３により固定する部分を弾性伸縮部材２の長手方向（ＭＤ方向）に間欠的に設ける（つまり前述の配置・間隔で形成された多数の溶着部３からなる溶着部群領域４４と、溶着部を有しない非溶着部領域４５とを、弾性伸縮部材２の長手方向（ＭＤ方向）に交互に形成する）と、伸縮性が向上するとともに溶着部３の面積が減少するため、より柔らかな風合い及びより高い通気性が得られるようになる。もちろん、図１２に示すように、溶着部３により固定する溶着部群領域４４を弾性伸縮部材２の長手方向（ＭＤ方向）全体にわたり連続的に設けることもできる。 FIG. 11 shows a case where the present invention is applied to the elastic elastic member 2 used for shearing formation around the trunk of a pants-type paper diaper. In the illustrated form, the elastic elastic member 2 on the back side and / or the elastic elastic member 2 on the abdominal side is cut or provided at the central portion in the diametrical direction (the portion overlapping the portion having the absorber that absorbs and holds excrement). However, it may be continuous from one end in the diameter direction to the other end. In the case where the elastic stretchable member 2 is provided over a wide range as in the case of the waistline portion, the portion fixed by the welded portion 3 is intermittently provided in the longitudinal direction (MD direction) of the elastic stretchable member 2 (that is, at the above-described arrangement / interval). The welded portion group region 44 formed of a large number of welded portions 3 and the non-welded portion region 45 having no welded portion are alternately formed in the longitudinal direction (MD direction) of the elastic stretchable member 2) and stretchable As a result, the area of the welded portion 3 is reduced and a softer texture and higher air permeability can be obtained. Of course, as shown in FIG. 12, the welding part group area | region 44 fixed by the welding part 3 can also be provided continuously over the whole longitudinal direction (MD direction) of the elastic expansion-contraction member 2. As shown in FIG.

溶着部群領域４４の間欠配置は弾性伸縮部材２を多数並設する場合にも適用できるが、各弾性伸縮部材２の溶着部による固定部分の長手方向（ＭＤ方向）位置が異なると、弾性伸縮部材２の収縮により形成される皺が不規則になり、見栄えの悪い凹凸表面が形成されてしまう。よって、上述のような間欠配置を採用する場合、図１１に示すように、弾性伸縮部材２の長手方向（ＭＤ方向）における溶着部による固定部分の位置を揃えるのが好ましい。具体的には、並設された弾性伸縮部材２を縦断する細長状の溶着部群領域４４と、並設された弾性伸縮部材２を縦断する非溶着部領域４５とを弾性伸縮部材２の長手方向（ＭＤ方向）に交互に形成する。これにより、きれいな皺（襞）のシャーリングが形成されるようになる。溶着部群領域４４の幅（両端に位置する溶着部３の中心間距離）Ｗ４４は２〜１０ｍｍ程度であるのが好ましく、３〜５ｍｍ程度であるのがより好ましい。隣接する溶着部群領域４４の中心間隔ＤＣＴは５〜２０ｍｍ程度であるのが好ましい。さらに、ＤＣＴ／２≧Ｗ４４の関係を満たすとより好ましい。   The intermittent arrangement of the welded portion group region 44 can be applied to a case where a large number of elastic elastic members 2 are arranged side by side. The wrinkles formed by the contraction of the member 2 become irregular, and an uneven surface with poor appearance is formed. Therefore, when adopting the intermittent arrangement as described above, as shown in FIG. 11, it is preferable to align the position of the fixing portion by the welded portion in the longitudinal direction (MD direction) of the elastic elastic member 2. Specifically, an elongated welded portion group region 44 that vertically cuts the elastic elastic members 2 arranged side by side and a non-welded portion region 45 that cuts the elastic elastic members 2 arranged side by side are arranged in the longitudinal direction of the elastic elastic member 2. They are formed alternately in the direction (MD direction). As a result, a beautiful shirring of the kites is formed. The width (the distance between the centers of the welded portions 3 located at both ends) W44 of the welded portion group region 44 is preferably about 2 to 10 mm, and more preferably about 3 to 5 mm. It is preferable that the center interval DCT between adjacent welded portion group regions 44 is about 5 to 20 mm. Furthermore, it is more preferable that the relationship of DCT / 2 ≧ W44 is satisfied.

また、弾性伸縮部材２の伸張倍率が高い上に、使用中に伸縮部にかかる引張り力が大きい場合には、内外シート１Ａ，１Ｂとの摩擦力のみでは十分に弾性伸縮部材２の固定を維持できない虞がある。その場合には、弾性伸縮部材２の長手方向の少なくとも一方端部において、平行に配設された弾性伸縮部材２を縦断するように配置される略直線状の溶着線により、弾性伸縮部材２と外装シート１２の内外シート１Ａ，１Ｂとを溶着固定し、弾性伸縮部材２の固定を確実にしてもよい。   Further, when the elastic expansion / contraction member 2 has a high expansion ratio and a large tensile force is applied to the expansion / contraction portion during use, the elastic expansion / contraction member 2 is sufficiently fixed only by the frictional force with the inner and outer sheets 1A and 1B. There is a possibility that it cannot be done. In that case, at least one end of the elastic expansion / contraction member 2 in the longitudinal direction is connected to the elastic expansion / contraction member 2 by a substantially linear welding line arranged to cut the elastic expansion / contraction member 2 arranged in parallel. The inner and outer sheets 1 </ b> A and 1 </ b> B of the exterior sheet 12 may be welded and fixed to secure the elastic elastic member 2.

他方、上記実施形態からも判るように、本発明の伸縮部形成方法を実施するには超音波接着方式が好適であるが、凹凸を備えたエンボスロールと対向するプレーンロールとからなり、熱及び圧力によりシートを圧着する熱エンボス接着方式を用いても実施することが可能である。   On the other hand, as can be seen from the above embodiment, the ultrasonic bonding method is suitable for carrying out the stretchable part forming method of the present invention, but it is composed of an embossed roll provided with unevenness and a plain roll facing the heat, and heat and It can also be carried out using a hot embossing adhesion method in which a sheet is pressure-bonded by pressure.

＜評価試験＞
超音波溶着を用いた本発明にかかる製造方法により、表１に示す条件で各種の伸縮シートを製造し、「柔らかさ」、「シートの層間接着力」、「抜け難さ（引き込みの起こり難さ」、及び「切断し難さ」について評価した。
なお、内シート及び外シートとしては、スパンボンド不織布（１層、坪量：２０ｇ／ｍ2、厚み：０．１８ｍｍ、繊度２．２ｄｔｅｘ、組成：ＰＥ（鞘）／ＰＰ（芯）＝１／１、シート幅：１５０ｍｍ）を用いた。また、弾性伸縮部材２としては、４７０ｄｔｅｘ（直径：０．３１１ｍｍ）のスパンデックスを用い、シートの横方向に沿って２７０％に伸張（元の長さの２．７倍、直径は０．１６２ｍｍ）した状態で固定した。また弾性伸縮部材２は、５ｍｍの間隔で２０本平行に並設した。
また、「柔らかさ」は、従来の接着剤により弾性伸縮部材を固定したシートと比較した官能評価を行い、被験者１０名のうち９名以上が柔らかいと評価したものを◎とし、７〜８名が柔らかいと評価したものを○とし、４〜６名が柔らかいと評価したものを△とし、３名以下が柔らかいと評価したものを×とした。「シートの層間接着力」の評価においては、接着したシートを手で引き剥がした際にシート自体が破壊したものを◎とし、シートが部分的に破壊または層間剥離を伴い破壊したものを○とし、僅かな毛羽立ちを残して剥離したものを△とし、実質的に接着しなかったものを×とした。「抜け難さ（引き込みの起こり難さ）の評価においては、シートを切断した時の切断部からの弾性伸縮部材の引き込みが１ｍｍ以下のものを◎◎とし、３ｍｍ以下のものを◎とし、５ｍｍ以下のものを○とし、１０ｍｍ以下のものを△とし、１１ｍｍ以上のものを×とした。「切断し難さ」の評価においては、シートの長さ方向１００ｍｍの範囲に、切断箇所が１箇所以下のものを◎とし、５箇所以下のものを○とし、１０箇所以下のものを△とし、２０箇所以下のものを△〜×とし、２１箇所以上のものを×とした。 <Evaluation test>
By the manufacturing method according to the present invention using ultrasonic welding, various stretchable sheets are manufactured under the conditions shown in Table 1, and “softness”, “sheet interlayer adhesion”, “difficult to pull out (retraction is difficult to occur) ”And“ difficult to cut ”were evaluated.
In addition, as an inner sheet and an outer sheet, a spunbond nonwoven fabric (one layer, basis weight: 20 g / m 2 , thickness: 0.18 mm, fineness 2.2 dtex, composition: PE (sheath) / PP (core) = 1 / 1, sheet width: 150 mm). Further, as the elastic stretchable member 2, a spandex of 470 dtex (diameter: 0.311 mm) is used, and is stretched to 270% along the lateral direction of the sheet (2.7 times the original length, the diameter is 0.162 mm). Fixed in the state. Further, 20 elastic stretch members 2 were arranged in parallel at intervals of 5 mm.
“Softness” is a sensory evaluation in comparison with a sheet in which an elastic elastic member is fixed with a conventional adhesive, and 9 to 10 test subjects are evaluated as soft. Was evaluated as ◯, 4 to 6 were evaluated as soft, △ was evaluated as 3 or less were evaluated as ×. In the evaluation of “sheet interlayer adhesion”, “◎” indicates that the sheet itself was destroyed when the adhered sheet was peeled off by hand, and “◯” indicates that the sheet was partially broken or accompanied by delamination. In addition, a sample which was peeled off while leaving a slight fluff was represented by Δ, and a sample which did not substantially adhere was represented by ×. “In the evaluation of the difficulty of pulling out (the difficulty of pulling in), when the sheet is cut, the elastic elastic member from the cut part is 1 mm or less, ◎◎, 3 mm or less is ◎, 5 mm The following were marked with ◯, those with 10 mm or less as Δ, and those with 11 mm or more as x: In the evaluation of “difficult to cut”, there was one cut in the range of 100 mm in the length direction of the sheet. The following were evaluated as ◎, those at 5 or less locations as ◯, those at 10 locations or less as Δ, those at 20 locations or less as Δ to ×, and those at 21 locations or more as ×.

Figure 0005124187
Figure 0005124187

パンツ型の紙おむつの斜視図である。It is a perspective view of a pants-type paper diaper. シャーリング部分の拡大図である。It is an enlarged view of a shearing part. 伸縮部形成装置を説明するための概要図である。It is a schematic diagram for demonstrating an expansion-contraction part formation apparatus. ホーンとアンビルロールに連続シートが挟まれた状態を示す、第１の実施形態の直径方向断面図及びその横断面図である。It is a diameter direction sectional view of the 1st embodiment which shows the state where a continuous sheet was pinched between a horn and an anvil roll, and its transverse cross section. 弾性伸縮部材に引張力をかけた状態の連続シートの第１の実施形態の直径方向断面図及びその横断面図である。It is a diameter direction sectional view of the 1st embodiment of a continuous sheet in the state where tension was applied to an elastic elastic member, and its transverse sectional view. 弾性伸縮部材に引張力をかけない状態の連続シートの第１の実施形態の直径方向断面図及びその横断面図である。It is a diameter direction sectional view of a 1st embodiment of a continuous sheet in the state where tension is not applied to an elastic elastic member, and its cross section. ホーンとアンビルロールに連続シートが挟まれた状態を示す、第２の実施形態の直径方向断面図及びその横断図である。It is the diameter direction sectional view of 2nd Embodiment which shows the state where the continuous sheet was pinched | interposed into the horn and the anvil roll, and its cross section. 弾性伸縮部材に引張力をかけた状態の連続シートの第２の実施形態の直径方向断面図及びその横断面図である。It is a diameter direction sectional view and a transverse sectional view of a 2nd embodiment of a continuous sheet in the state where tension was applied to an elastic elastic member. 弾性伸縮部材に引張力をかけない状態の連続シートの第２の実施形態の直径方向断面図及びその横断面図である。It is a diameter direction sectional view of the 2nd embodiment of the state of a state where tension is not applied to an elastic elastic member, and its transverse section. 千鳥状の突起の配列を有するアンビルロールに連続シートが挟まれた状態を示す横断面図である。It is a cross-sectional view showing a state in which a continuous sheet is sandwiched between anvil rolls having an array of staggered protrusions. パンツ型紙おむつの胴回り部シャーリングへの応用例を示す概略図である。It is the schematic which shows the example of application to the trunk part part shirring of a pants-type paper diaper. パンツ型紙おむつの胴回り部シャーリングへの他の応用例を示す概略図である。It is the schematic which shows the other application example to the trunk periphery part shearing of a pants-type paper diaper.

１…シート、２…弾性伸縮部材、３…溶着部、１０…連続シート、２０…超音波振動源、２１…ホーン、２２…アンビルロール、２２Ａ，２２Ｂ，２２Ｃ突起、Ｓ…シャーリング。   DESCRIPTION OF SYMBOLS 1 ... Sheet | seat, 2 ... Elastic expansion-contraction member, 3 ... Welding part, 10 ... Continuous sheet, 20 ... Ultrasonic vibration source, 21 ... Horn, 22 ... Anvil roll, 22A, 22B, 22C protrusion, S ... Shirring.

Claims (4)

内シートと外シートとの間に平行に並べた複数の弾性伸縮部材を挟み込んだ連続シートを用い、
前記内シートと外シートとを供給方向に対して間欠的に溶着することにより前記弾性伸縮部材を固定する、吸収性物品の伸縮部形成方法であって、
前記弾性伸縮部材に引張力をかけた状態で、前記弾性伸縮部材の直径方向の両側部近傍において、前記内シートと外シートとを前記供給方向に間欠的に溶着し、
その後に、前記内シートと外シートとの溶着部分によって閉鎖された断面空間内において、前記弾性伸縮部材に引張力を解放して前記弾性伸縮部材の断面外径を拡大させ、前記弾性伸縮部材の外面と前記閉鎖された空間を形成するシートとの摩擦力によって、前記弾性伸縮部材をシートに固定する、
ことを特徴とする伸縮部形成方法。 Using a continuous sheet with a plurality of elastic elastic members arranged in parallel between the inner sheet and the outer sheet,
A method for forming a stretchable part of an absorbent article, wherein the elastic stretchable member is fixed by intermittently welding the inner sheet and the outer sheet in the supply direction,
With the tensile force applied to the elastic elastic member, in the vicinity of both sides in the diameter direction of the elastic elastic member , the inner sheet and the outer sheet are intermittently welded in the supply direction ,
Thereafter, in the cross-sectional space closed by the welded portion between the inner sheet and the outer sheet, the tensile force is released to the elastic elastic member to enlarge the cross-sectional outer diameter of the elastic elastic member, and the elastic elastic member The elastic elastic member is fixed to the sheet by a frictional force between an outer surface and the sheet forming the closed space .
A stretchable part forming method characterized by the above. 内シートと外シートとの間に平行に並べた複数の弾性伸縮部材を挟み込んだ連続シートを用い、
前記内シートと外シートとを供給方向に対して間欠的に溶着することにより前記弾性伸縮部材を固定する、吸収性物品の伸縮部形成方法であって、
前記弾性伸縮部材に引張力をかけた状態で、前記弾性伸縮部材の直径方向の両側部近傍及び前記弾性伸縮部材と重なる両側部において、前記内シートと外シートとを前記供給方向に間欠的に溶着し、
その後に、前記内シートと外シートとの溶着部分によって閉鎖された断面空間内において、前記弾性伸縮部材に引張力を解放して前記弾性伸縮部材の断面外径を拡大させ、前記弾性伸縮部材の外面と前記閉鎖された空間を形成するシートとの摩擦力、並びに前記側部におけるシートとの接合力によって、前記弾性伸縮部材をシートに固定する、
ことを特徴とする伸縮部形成方法。 Using a continuous sheet with a plurality of elastic elastic members arranged in parallel between the inner sheet and the outer sheet,
A method for forming a stretchable part of an absorbent article, wherein the elastic stretchable member is fixed by intermittently welding the inner sheet and the outer sheet in the supply direction,
In a state where a tensile force is applied to the elastic elastic member , the inner sheet and the outer sheet are intermittently provided in the supply direction in the vicinity of both sides in the diameter direction of the elastic elastic member and on both sides overlapping the elastic elastic member. Welded,
Thereafter, in the cross-sectional space closed by the welded portion between the inner sheet and the outer sheet, the tensile force is released to the elastic elastic member to enlarge the cross-sectional outer diameter of the elastic elastic member, and the elastic elastic member The elastic elastic member is fixed to the sheet by the frictional force between the outer surface and the sheet forming the closed space, and the bonding force between the sheet at the side part ,
A stretchable part forming method characterized by the above. 内シートと外シートとの間に平行に並べた複数の弾性伸縮部材を挟み込んだ連続シートを用い、
前記弾性伸縮部材に引張力をかけた状態で、前記内シートと外シートとを供給方向に対して間欠的に溶着することにより前記弾性伸縮部材を固定する、吸収性物品の伸縮部形成装置であって、
該装置は、超音波振動源と、この超音波振動源に連結されたホーンと、このホーンに対向配置されたアンビルロールと、を備え、
アンビルロールの外周面には、接着面となる複数の突起が形成され、
これら突起は格子状の配置で、かつアンビルロールの幅方向の突起と突起との間隔が、引張力をかけた状態の弾性伸縮部材の断面外径と略同じ長さに構成され、前記弾性伸縮部材は前記間隔内を通過し、内シートと外シートとの溶着部分によって前記弾性伸縮部材を包む閉鎖された断面空間構成するように構成されている、
ことを特徴とする伸縮部形成装置。 Using a continuous sheet with a plurality of elastic elastic members arranged in parallel between the inner sheet and the outer sheet,
An apparatus for forming a stretchable part of an absorbent article, wherein the elastic stretchable member is fixed by intermittently welding the inner sheet and the outer sheet with respect to a supply direction in a state where a tensile force is applied to the elastic stretchable member. There,
The apparatus includes an ultrasonic vibration source, a horn connected to the ultrasonic vibration source, and an anvil roll disposed to face the horn.
On the outer peripheral surface of the anvil roll, there are formed a plurality of protrusions that become adhesive surfaces,
These protrusions are arranged in a lattice pattern , and the interval between the protrusions in the width direction of the anvil roll is configured to be substantially the same as the outer diameter of the cross section of the elastic stretchable member in a state where a tensile force is applied. The elastic member is configured to pass through the interval and constitute a closed sectional space that wraps the elastic elastic member by a welded portion between the inner sheet and the outer sheet.
A stretchable part forming apparatus. 内シートと外シートとの間に平行に並べた複数の弾性伸縮部材を挟み込んだ連続シートを用い、
前記弾性伸縮部材に引張力をかけた状態で、前記内シートと外シートとを供給方向に対して間欠的に溶着することにより前記弾性伸縮部材を固定する、吸収性物品の伸縮部形成装置であって、
該装置は、超音波振動源と、この超音波振動源に連結されたホーンと、このホーンに対向配置されたアンビルロールと、を備え、
アンビルロールの外周面には、接着面となる複数の突起が形成され、
これら突起は前記外周線を跨いだ千鳥状で、かつアンビルロールの回転方向に対して斜め方向に隣接する突起と突起との幅方向の間隔が、引張力をかけた状態の弾性伸縮部材の断面外径と略同じ長さに構成され、前記弾性伸縮部材は前記間隔内を通過し、内シートと外シートとの溶着部分によって前記弾性伸縮部材を包む閉鎖された断面空間構成するように構成されている、
ことを特徴とする伸縮部形成装置。 Using a continuous sheet with a plurality of elastic elastic members arranged in parallel between the inner sheet and the outer sheet,
An apparatus for forming a stretchable part of an absorbent article, wherein the elastic stretchable member is fixed by intermittently welding the inner sheet and the outer sheet with respect to a supply direction in a state where a tensile force is applied to the elastic stretchable member. There,
The apparatus includes an ultrasonic vibration source, a horn connected to the ultrasonic vibration source, and an anvil roll disposed to face the horn.
On the outer peripheral surface of the anvil roll, there are formed a plurality of protrusions that become adhesive surfaces,
These protrusions are staggered across the outer circumferential line , and the cross section of the elastic elastic member in the state where the protrusions adjacent to each other in the oblique direction with respect to the rotation direction of the anvil roll are applied with a tensile force. The elastic stretchable member is configured to have substantially the same length as the outer diameter, and the elastic stretchable member is configured to pass through the gap and form a closed cross-sectional space that wraps the elastic stretchable member by a welded portion between the inner sheet and the outer sheet. Being
A stretchable part forming apparatus.
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