JP7061565B2 - 弾性積層体の製造方法及び積層加工弾性製品 - Google Patents
弾性積層体の製造方法及び積層加工弾性製品 Download PDFInfo
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- JP7061565B2 JP7061565B2 JP2018530194A JP2018530194A JP7061565B2 JP 7061565 B2 JP7061565 B2 JP 7061565B2 JP 2018530194 A JP2018530194 A JP 2018530194A JP 2018530194 A JP2018530194 A JP 2018530194A JP 7061565 B2 JP7061565 B2 JP 7061565B2
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- elastic film
- web
- calendar
- elastic
- laminate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/0076—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised in that the layers are not bonded on the totality of their surfaces
- B32B37/0084—Point bonding
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- A61F13/00—Bandages or dressings; Absorbent pads
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- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15699—Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
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Description
より詳細には、本発明の目的は、弾性積層体の製造方法および該方法によって製造された積層加工弾性製品を提供することにある。
この種の製品は、例えば、乳児用おむつの閉鎖部分又は他の部分を実現するために使用するために、しばしば最適な弾性特性を必要とする。
これらの製品は、伸ばすことができるだけでなく、一定のサイクル数の後であっても、適切な引張強度を備えていなければならない。
他の重要な特徴は、これらの製品は、製品と使用者が接触する領域との間の接触面に対応する部分の手触りが良くなければ、例えば、柔らかくなければならないことにある。
同時に、これらの製品は、使用中の適切な強度を確保しなければならず、かつ、非常に軽く、非「侵襲的」な外観を保証しなければならない。
現在市販されている製品は、これらの要求をすべて同時に満たすことができず、何より、従来の製品は、十分な柔らかさ、弾性及び強度を同時に保証することができない。
・少なくとも二つの異なるポリマー材料を有する少なくとも三つの層を備えた弾性フィルムから成る第一ウェブを共押出しする工程
・前記共押出した第一弾性フィルムウェブと、二つの第二不織布ウェブとを同時に熱結合カレンダに送る工程であって、そこで、カレンダに入る時に第一弾性フィルムウェブが前記二つの第二不織布ウェブの間に配置され、かつ、共押出し工程から熱結合工程への動作中に、前記第一弾性フィルムウェブが、共押出し工程における溶融状態から、カレンダに入る時に固化及び冷却状態に移行するようにされる工程
・前記カレンダにおけるスポット溶接を通して、前記第二不織布ウェブを、前記第一弾性フィルムの各対向する外側層に結合して、中間ウェブを製造する工程
同ウェブを横切る方向に前記中間ウェブを機械的に伸長させる工程
エラストマー:
ポリ(エチレン-ブテン)
ポリ(エチレン-ヘキセン)
ポリ(エチレン-オクテン)
ポリ(エチレン-プロピレン)
ポリ(スチレン-ブタジエン-スチレン)
ポリ(スチレン-イソプレン-スチレン)
ポリ(スチレン-エチレン-ブチレン-スチレン)
ポリ(エステル-エーテル)
ポリ(エーテル-アミド)
ポリ(エチレン-酢酸ビニル)
ポリ(エチレン-メチルアクリレート)
ポリ(エチレン-アクリル酸)
ポリ(エチレンブチルアクリレート)
ポリウレタン
ポリ(エチレン-プロピレン-ジエン)
エチレン-プロピレンゴム
・伸長工程後の積層体の厚さと10NでのMD破断伸びとの間の比率は、8より小さく、好ましくは、7.5より小さく、及び/又は
・伸長工程後の積層体の厚さとCD引張強度との間の(N/50mm)/(mm)における比率は、79より小さく、好ましくは、78より小さく、及び/又は
・伸長工程後の積層体の重さと厚さとの間の(g/m2/mm)における比率は、105より小さく、より好ましくは100より小さい。
本発明の別の目的は、公知の製品と比較して高い弾性、高い引張強度及び高い柔軟性を有する弾性積層体、特に、限定するものではないが、衛生製品及び生理製品等、例えば、おむつの閉鎖部分に使用される弾性積層体を提供することにある。
前記弾性積層体は、
・外側層が同じポリマー材料で形成され、かつ、内側層が異なるポリマー材料によって形成された三つの共押出しされた層によって形成されるポリマー中間弾性フィルムと、
・共押出し弾性フィルムの外側層に対してスポット溶接又は領域溶接を通して結合される二つの不織布繊維と
を備え、
・伸長工程後の積層体の厚さと10NでのMD破断伸びとの間の比率が、8より小さく、好ましくは、7.5より小さく、及び/又は
・伸長工程後の積層体の厚さとCD引張強度との間の(N/50mm)/(mm)における比率が、79より小さく、好ましくは、78より小さく、及び/又は
・伸長工程後の積層体の重さと厚さとの間の(g/m2/mm)における比率が、105より小さく、より好ましくは100より小さい。
エラストマー:
ポリ(エチレン-ブテン)
ポリ(エチレン-ヘキセン)
ポリ(エチレン-オクテン)
ポリ(エチレン-プロピレン)
ポリ(スチレン-ブタジエン-スチレン)
ポリ(スチレン-イソプレン-スチレン)
ポリ(スチレン-エチレン-ブチレン-スチレン)
ポリ(エステル-エーテル)
ポリ(エーテル-アミド)
ポリ(エチレン-酢酸ビニル)
ポリ(エチレン-メチルアクリレート)
ポリ(エチレン-アクリル酸)
ポリ(エチレンブチルアクリレート)
ポリウレタン
ポリ(エチレン-プロピレン-ジエン)
エチレン-プロピレンゴム
この実施例では、不織布ウェブは、同軸タイプの複合繊維を有する。例えば、内側の同軸ファイバの内側部分はポリエチレンで形成され、外側部分はポリプロピレンで形成されている。これらの不織布は、好ましくは、スパンボンド不織布である。
Claims (12)
- 弾性積層体の製造方法であって、
・少なくとも二つの異なるポリマー材料を有する少なくとも三つの層(F1,F2,F1)を備えた弾性フィルムから成る第一ウェブ(F)を共押出しする工程、
・前記共押出した第一弾性フィルムウェブ(F)と、二つの第二不織布ウェブ(T1,T2)とを同時に熱結合カレンダに送る工程であって、そこで、カレンダ(14)に入る時に第一弾性フィルムウェブ(F)が前記二つの第二不織布ウェブ(T1,T2)の間に配置され、共押出し工程から熱結合工程への動作中に、前記第一弾性フィルムウェブ(F)が、共押出し工程における溶融状態から、カレンダ(14)に入る時に固化及び冷却状態に移行するようにされるようにする工程、
・前記カレンダ(14)におけるスポット溶接又は領域溶接(Z)を通して、前記第二不織布ウェブ(T1,T2)を、前記第一弾性フィルムウェブ(F)の各対向する外側層に結合して、中間ウェブ(P1)を製造する工程、及び
・同ウェブを横切る方向に前記中間ウェブ(P1)を機械的に伸長させる工程
を同じ製造ラインで備え、
共押出し工程の最後で、弾性フィルムが、好ましくは、220℃から270℃の間の温度を有し、
カレンダに入る時の前記共押出し弾性フィルムの温度は、10℃から40℃の間であり、
前記共押出しされた弾性フィルム(F)が、前記カレンダ(14)に入る時に、共押出し工程の終わりの弾性フィルムの温度の1/10と等しいか、それより低い温度を有し、
前記弾性フィルム(F)が三つの層から成り、カレンダ(14)に入る、二つの外側層(F1)の厚さの合計と、共押出し弾性フィルム(F)から成る内側層(F2)の厚さとの間の比率が、1/3から1/25の間であり、
前記弾性フィルム(F)の二つの外側層(F1)が、同じポリマー材料で形成され、かつ、同じ厚さを有し、
前記第二不織布ウェブ(T1,T2)の少なくとも一方が、伸長可能なタイプであり、かつ、
カレンダ(14)のローラの温度が120℃から160℃の間であるか、又は、カレンダ(14)のローラ間の積層加工圧力が70kg/cm2から160kg/cm2の間である
ことを特徴とする製造方法。 - 前記共押出しされた弾性フィルム(F)の第一ウェブが、押出し工程からカレンダ(14)の入口まで、5mから20mの間の空気路を移動する
ことを特徴とする請求項1に記載の製造方法。 - 熱溶接工程の後で伸長工程の前に、前記中間ウェブ(P1)が、15℃から40℃の間の温度まで冷却される
ことを特徴とする請求項1又は2の何れか一項に記載の製造方法。 - 前記弾性フィルム(F)の前記外側層(F1)を形成する材料の少なくとも一部が、それらが各々面する不織布ウェブ(T1,T2)の材料の少なくとも一部に対する熱的適合性を有する
ことを特徴とする請求項1~3の何れか一項に記載の製造方法。 - 前記第二不織布ウェブ(T1,T2)の少なくとも一方が、複合繊維を有する
ことを特徴とする請求項1~4の何れか一項に記載の製造方法。 - 前記第二不織布ウェブ(T1,T2)の少なくとも一方が、スパンボンドウェブ、サーモボンドウェブ又はスパンレースウェブである
ことを特徴とする請求項1~5の何れか一項に記載の製造方法。 - 製造ラインを出る積層加工製品(P)の厚さが、カレンダ(14)に入る不織布ウェブ(T1,T2)と弾性フィルム(F)と合計の厚さに対して増加し、その増加量は、50%から66%の間である
ことを特徴とする請求項1~6の何れか一項に記載の製造方法。 - ・伸長工程後の積層体の厚さと10NでのMD破断伸びとの間の比率が、8より小さく、好ましくは、7.5より小さく、及び/又は
・伸長工程後の積層体の厚さとCD引張強度との間の(N/50mm)/(mm)における比率が、79より小さく、好ましくは、78より小さく、及び/又は
・伸長工程後の積層体の重さと厚さとの間の(g/m2/mm)における比率が、105より小さく、より好ましくは100より小さい
ことを特徴とする請求項1~7の何れか一項に記載の製造方法。 - 溶接スポット又は溶接領域(Z)の密度が、15スポット/cm2から60スポット/cm2の間である
ことを特徴とする請求項1~8の何れか一項に記載の製造方法。 - 請求項1及び9に記載の方法により製造される弾性積層体であって、
該弾性積層体が、
外側層(F1)が同じポリマー材料で形成され、かつ、内側層(F2)が異なるポリマー材料によって形成された三つの共押出しされた層(F1,F2,F1)によって形成されるポリマー中間弾性フィルム(F)と、
前記共押出し弾性フィルム(F)の二つの対向する面に、スポット溶接又は領域溶接(Z)を通して結合される二つの不織布繊維(T1,T2)と
を備え、
伸長工程後の積層体の厚さと10NでのMD破断伸びとの間の比率が、8より小さく、好ましくは、7.5より小さく、及び/又は
・伸長工程後の積層体の厚さとCD引張強度との間の(N/50 mm)/(mm)における比率が、79より小さく、好ましくは、78より小さく、及び/又は
・伸長工程後の積層体の重さと厚さとの間の(g/m2/mm)における比率が、105より小さく、より好ましくは100より小さい
ことを特徴とする弾性積層体。 - 前記弾性フィルム(F)の前記外側層(F1)を形成する材料の少なくとも一部が、それらが接触することになる不織布ウェブの繊維の材料の少なくとも一部に対する熱的適合性を有する
ことを特徴とする請求項10に記載の弾性積層体。 - 前記第二不織布ウェブ(T1,T2)の少なくとも一方が、伸長可能なタイプである
ことを特徴とする請求項10又は11に記載の弾性積層体。
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JP2023514468A (ja) * | 2019-11-06 | 2023-04-06 | ニットウ・アドヴァンスト・フィルム・グローナウ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | 弾性ラミネートを製造する方法、および該方法により得られるラミネート |
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