JP4948750B2 - スラブ材から履物の靴底を成形する方法 - Google Patents

スラブ材から履物の靴底を成形する方法 Download PDF

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JP4948750B2
JP4948750B2 JP2004072170A JP2004072170A JP4948750B2 JP 4948750 B2 JP4948750 B2 JP 4948750B2 JP 2004072170 A JP2004072170 A JP 2004072170A JP 2004072170 A JP2004072170 A JP 2004072170A JP 4948750 B2 JP4948750 B2 JP 4948750B2
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sole
footwear
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サン・サソンコ
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ワーセン・インダストリーズ・インコーポレーテッド
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Description

本発明は靴底に靴甲部を接合させるための同時押出し成形接着フィルムに関する。
履物アセンブリの製造においては、最後に靴底が靴甲部に取り付けられる。ほとんど例外なく、接着剤が使用され、また高級な履物アセンブリでは靴甲部が靴底に直接または中間構造物を介して縫い合わされることもある。接着剤の他に、靴底と靴甲部の境界をシールすることも検討されている。
射出成形された靴底などの成形靴底では、型の上部に接着フィルムを取り付け、そして靴底を成形する。接着フィルムが靴底に接着される。次に甲部へ取り付けるために、接着フィルムはそのままで、成形された靴底が型から出される。
靴底を圧縮成形する場合、靴底材は初めは一般に矩形スラブ（厚めの平な板）の形である。このスラブから靴底になる「クッキー」が切り出される。成形工程で離型剤を使用する。成形後のクッキーが靴底となる。この離型剤は除去される。靴底に下塗りおよび液体接着剤が塗布され、最後に靴底が靴甲部に取り付けられる。型の中に接着剤を塗ることは不可能である。また、成形した靴底に型の内部で接着剤を塗布することも不可能であり、これは時間が掛かり過ぎる。
本発明において、内側の接着剤はスラブの上面と結合される。外側の熱可塑性接着剤はこの内側の接着剤と結合される。これらの接着剤は単独で塗布もしくはニップローラによる同時押出しとして塗布してもよく、またはフィルムとして吹き付けてもよい。クッキーが形成され、圧縮成形され、靴底は靴甲部に取り付けられる状態になる。別々の下塗りおよび接着剤塗布の各工程は除かれる。
内側の接着剤はエチレン共重合体ベースの接着剤であることが好ましく、外側の接着剤は熱可塑性ポリウレタンベースの接着剤であることが好ましい。
靴底を靴甲部に取り付けた後は、靴底と靴甲部の接着剤接合は、靴底取り付け接着剤に対するＳＡＴＲＡ（Shoe & Allied Trade Research Association）の公表された基準、具体的にはＳＡＴＲＡ ＴＭ４０９、完成した履物の靴底接合の耐熱性／熱経時変化；ＳＡＴＲＡ ＴＭ９２、履物曲げに対する耐性；およびＳＡＴＲＡ ＴＭ４１１ 履物のはく離接着強さに適合するかまたはこれを超えていなければならない。
本発明において、一方の接着剤はエチレン共重合体ベースの接着剤であることが好ましく、外側の接着剤は熱可塑性ポリウレタンベースの接着剤であることが好ましい。熱可塑性の外側接着剤は極性の材料と接合させる。エチレン共重合体ベースの接着剤は無極性の材料と接合させる。これらの接着剤は単独で塗布もしくはニップローラによる同時押出しとして塗布してもよく、または吹き付けてフィルム状としてもよい。
本発明を以下の非限定的実施例を参照して説明する。靴底の意図した用途および靴底の寸法に応じて、たとえば大きさがおおよそ３９×５２インチ（９９×１３２ｃｍ）で厚さが０．１２５インチ（０．３１７５ｃｍ）から４．０インチ（１０．１６ｃｍ）のエチレン−酢酸ビニル共重合体スラブが靴底上部になる表面上に被覆される。
熱可塑性ポリウレタンエラストマー、たとえば、Ｉｒｏｇｒａｎ（登録商標）ＣＡ１１６Ｈｕｎｔｓｍａｎが約０．０００５インチ（１３μｍ）から０．００５インチ（１２７μｍ）の厚さで、０．０００５インチ（１３μｍ）から０．００５インチ（１２７μｍ）の厚さの無水物変性エチレン−酢酸ビニル共重合体、たとえば、ＤｕＰｏｎｔ社のＢｙｎｅｌ（登録商標）シリーズ３８００、具体的にはＢｙｎｅｌ（登録商標）Ｅ４１８、またはＦｕｓａｂｏｎｄ（登録商標）Ｃシリーズ、具体的にはＭＣ１９０Ｄと共に同時押出し成形され、積層されて同時押出し成形物となる。その後、エチレン−酢酸ビニル共重合体ベースの接着剤とともに、この同時押出し成形物が成形されていないエチレン共重合体ベースのスラブに積層され、それを６０〜１０００ｐｓｉ（約４１４〜６９００ｋＰａ）の圧力、エチレン共重合体ベース接着剤の活性化温度よりも高い温度でニップロールを通過させることで、その成形物がエチレン−酢酸ビニル共重合体スラブに結合させられる。
従来技術で知られているように、引き続いてクッキーが切り出され、その後従来技術の手法に従って圧縮成形されて、接着剤の同時押出し成形物が結合された上面を有する靴底が形成される。
図１を参照すると、靴底を一般に参照数字１０として示し、これは靴底材１２と、無水物変性エチレン−酢酸ビニル共重合体１６を備えた熱可塑性ポリウレタンエラストマー１４を含む。
靴底はそれ以上処理工程を必要とせずに靴甲部に接合させることができる。
特定の熱可塑性ポリウレタン接着剤およびエチレン共重合体ベースの接着剤について説明したが、他の好適な接着剤には熱可塑性ポリウレタン混合物およびポリエステルまたはポリアミド類が含まれる。
各接着剤には以下の押出し物の組み合わせが含まれる。すなわち、無水物もしくは酸変性エチレン−酢酸ビニル共重合体／熱可塑性ポリウレタン、酸変性酢酸アクリル／熱可塑性ポリウレタンまたはアクリル変性ポリウレタン、アクリルもしくは酸変性酢酸塩／熱可塑性ポリウレタン、アクリルもしくは酸変性アクリル酸／ポリエステル、酸もしくは無水物変性ポリオレフィン／熱可塑性ポリウレタンまたはアクリレート変性ポリウレタン、あるいは酸もしくは無水物変性ポリオレフィンまたは酸もしくは無水物変性アクリル酸／熱可塑性ポリウレタンまたはアクリレート変性ポリウレタン、エチレン共重合体／熱可塑性ポリウレタンの各組み合わせである。
具体的には、以下の、靴底材／内側接着剤／外側接着剤／靴甲部の組み合わせが本発明の目的に好適であると考えられる、靴底はすべて圧縮成形されたものである。
Figure 0004948750
前記の説明は、本発明の特定の実施形態に限定したものである。しかしながら、本発明の利益の一部またはすべてを実現して本発明の変形形態および変更形態が可能であることが明白であろう。したがって、添付請求項は、本発明の精神と範囲内にあるこのような変形形態および変更形態をすべて網羅することを目的とする。
履物アセンブリ用靴底を示す図である。
符号の説明
１０…靴底、１２…靴底材、１４…熱可塑性ポリウレタンエラストマー、１６…無水物変性エチレン−酢酸ビニル共重合体

Claims (7)

  1. スラブ材から履物の靴底を成形する方法において、
    この靴底は、上面を有し、この上面に結合された、外側の熱可塑性ポリウレタンベースの接着剤と、
    前記スラブ材の靴底と前記外側の熱可塑性ポリウレタンベースの接着剤との間に配置される内側のエチレン共重合体ベースの接着剤とからなり、
    前記方法は、前記内側の接着剤と外側の接着剤を前記スラブ材の靴底の上面に配置し、積層された前記スラブ材から靴底をカットするステップを含み、
    前記積層されたスラブ材からカットされた靴底は、靴底とその上面に結合された前記２つの接着剤層と圧縮成形されることを特徴とする、
    スラブ材から履物の靴底を成形する方法。
  2. 前記内側の接着剤が、酸変性酢酸アクリル類、アクリルまたは酸変性酢酸塩類、アクリルまたは酸変性アクリル酸類、酸または無水物変性ポリオレフィン類、およびエチレン共重合体類からなる群から選択される請求項１に記載のスラブ材から履物の靴底を成形する方法。
  3. 前記外側の接着剤が、熱可塑性ポリウレタン類、アクリル変性ポリウレタン類、アクリレート変性ポリウレタン類、ポリエステル類およびポリアミド類からなる群から選択される請求項２に記載のスラブ材から履物の靴底を成形する方法。
  4. 前記成形されていない靴底材が、エチレン共重合体類、Ｐｈｙｌｏｎ、エチレン−酢酸ビニル共重合体（ＥＶＡ）、ＥＤＰＭ重合体類または共重合体類ならびに天然および合成ゴム類からなる群から選択される請求項３に記載のスラブ材から履物の靴底を成形する方法。
  5. 前記内側および外側接着剤がそれぞれ０．００１２７ｃｍから０．０１２７ｃｍの範囲の厚さである請求項４に記載のスラブ材から履物の靴底を成形する方法。
  6. 前記靴底材が０．３１７５ｃｍから１０．１６ｃｍの範囲の厚さである請求項５に記載のスラブ材から履物の靴底を成形する方法。
  7. 前記外側の接着剤を靴甲部に接合する場合、接着剤接合が、ＳＡＴＲＡ基準のＴＭ４０９、ＴＭ９２およびＴＭ４１１に適合するかまたはこれを超える接合が成形される請求項１に記載のスラブ材から履物の靴底を成形する方法。
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