JP7298946B2 - インソールスクラップリサイクル方法、靴用発泡体、及びインソールスクラップ粉砕物 - Google Patents
インソールスクラップリサイクル方法、靴用発泡体、及びインソールスクラップ粉砕物 Download PDFInfo
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Description
このような靴底は、通常、靴の中敷(insole:以下「インソール」という。「フットベッド」とも呼ばれる。)と、歩行時に人体の荷重を弾力的に分散させ且つ支持することができるように緩衝力に優れたゴム又は発泡樹脂又はスポンジ材質などで製作されるミッドソール(midsole)と、前記ミッドソールの底面に付着して歩行時に摩擦力を付与するためにゴム材質で作られるアウトソール(outsole)とから構成される。
上記において、前記製品用発泡体形成ステップで得られた前記製品用発泡体は、平板形状をしており、靴用発泡体であることができる。
本発明の各ステップを詳細に説明する。
図1に示すように、平板状発泡体10の上面に布生地20が層状に配置される板状積層体100を形成する。布生地20は、平板状発泡体10に接着剤又は接着フィルムを介して一体化される。
図2に示すように、図1の板状積層体100を、足裏形状の複数(本実施形態の場合、4つ)のインソール用積層体110と、インソール用積層体110が除去された形態のインソールスクラップ積層体120に分離する。
インソールスクラップ積層体120を10℃以下で冷却粉砕又は凍結粉砕して平均粒径0.05~0.7mmのインソールスクラップ粉砕物を得る。
本発明は、粉砕されたインソールスクラップ粉砕物の布生地部位に糸くずが発生せず、均質な粉砕物を得るために冷却粉砕又は凍結粉砕方式を採用した。
発泡用樹脂、発泡用添加剤、及び前記インソールスクラップ粉砕物が混合された発泡体混合物を組成する。
発泡体混合物組成ステップで組成した発泡体混合物を発泡して、製品用発泡体を得る。
この時、製品用発泡体は、平板形状をしており、靴用発泡体、特にインソール用発泡体であることができる。
実験例1:
発泡用樹脂としてEVA(Ethylene Vinyl Acetate)樹脂6700gとポリエチレン(PE)樹脂2000gを、発泡用添加剤として架橋促進剤600g、発泡剤600g、架橋剤100gを混合して発泡体混合物を形成した後、
発泡体混合物をニーダーでミキシングし、ニーダーを経た混合物をロール加工によって分散及びシート形状に変形させ、適当な大きさにカットした後、カットされたシート形状の材料をプレスに入れ、一定時間熱を加えて発泡させることにより、製品用発泡体を得る。
実験例1によって製造された発泡体と布生地とが層状に配置された板状積層体から、足裏形状の4つの開口部を形成してインソールスクラップ積層体を得、これを平均直径0.5mmに冷却粉砕又は凍結粉砕してインソールスクラップ粉砕物を得る。図3は、これによって得られたインソールスクラップ粉砕物の拡大写真である。
Claims (3)
- 平板状発泡体の上面に布生地が層状に配置される板状積層体を形成する板状積層体形成ステップと、
前記板状積層体を、足裏形状のインソール用積層体と、前記インソール用積層体が除去された形態のインソールスクラップ積層体に分離するインソールスクラップ積層体分離ステップと、
前記インソールスクラップ積層体を10℃以下で冷却粉砕又は凍結粉砕して平均粒径0.05~0.7mmのインソールスクラップ粉砕物を得るインソールスクラップ粉砕物形成ステップと、を含んでなり、
前記インソールスクラップ粉砕物は発泡体製造用である、インソールスクラップリサイクル方法であって、
前記インソールスクラップ粉砕物形成ステップの後、発泡用樹脂、発泡用添加剤及び前記インソールスクラップ粉砕物が混合された発泡体混合物を形成する発泡体混合物形成ステップと、
前記発泡体混合物を発泡して製品用発泡体を得る製品用発泡体形成ステップと、をさらに含んでなる、前記インソールスクラップリサイクル方法であって、
前記発泡体混合物形成ステップで、前記発泡用樹脂100重量部に対して前記インソールスクラップ粉砕物20~60重量部が混合されたことを特徴とする、前記インソールスクラップリサイクル方法。 - 前記製品用発泡体形成ステップで得られた前記製品用発泡体は、平板形状をしており、靴用発泡体であることを特徴とする、請求項1に記載のインソールスクラップリサイクル方法。
- 請求項1又は2のいずれか一項に記載のインソールスクラップリサイクル方法によって製造された靴用発泡体。
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