JP7008018B2 - 立毛調人工皮革及びその製造方法 - Google Patents
立毛調人工皮革及びその製造方法 Download PDFInfo
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- JP7008018B2 JP7008018B2 JP2018524129A JP2018524129A JP7008018B2 JP 7008018 B2 JP7008018 B2 JP 7008018B2 JP 2018524129 A JP2018524129 A JP 2018524129A JP 2018524129 A JP2018524129 A JP 2018524129A JP 7008018 B2 JP7008018 B2 JP 7008018B2
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- artificial leather
- ultrafine fibers
- elastic body
- fluffy
- napped
- Prior art date
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Description
これらの中ではポリウレタンが好ましい。
海成分の熱可塑性樹脂としてエチレン変性ポリビニルアルコール(PVA)、島成分の熱可塑性樹脂としてイソフタル酸変性した変性PET(イソフタル酸単位の含有割合6モル%)を、それぞれ個別に溶融させた。そして、海成分中に均一な断面積の島成分が12個分布した断面を形成しうるような、12個のノズル孔が並列状に配置された複合紡糸用口金に、それぞれの溶融樹脂を供給した。このとき、島成分が0.30dtexになるように設計した、海成分と島成分との質量比が海成分/島成分=25/75になるように吐出量を調整しながら供給した。そして、口金温度260℃に設定されたノズル孔より単孔吐出量1.5g/分で吐出させた。
紡糸された複数本の海島型複合長繊維を、若干たるませた状態でポリエステルフィルムの表面にセロハンテープで貼り付けた。そして、95℃の熱水中に30分間以上浸漬させて海成分を抽出除去することにより極細長繊維を得た。次に、極細長繊維を固定したポリエステルフィルムをPot染色機で120℃×20分間染色処理し、染色糸を得た。そして、染色糸の中から海島型複合長繊維1本に相当する極細繊維束をまとめたままオートグラフで強伸度を測定し、極細繊維の繊維束の強伸度をオートグラフで測定した。そして、得られたSSカーブのピークトップから破断強力と破断伸度を読み取った。そして、染色後の糸タフネス(cN・%)=破断強力(cN)×破断伸度(%)/極細繊維の本数の式から糸タフネスを算出した。
立毛調人工皮革の立毛面の表面状態は、非接触式の表面粗さ・形状測定機である「ワンショット3D測定マクロスコープ VR-3200」(株式会社キーエンス製)を用いてISO 25178(面粗さ測定)に準じて測定した。具体的には、立毛調人工皮革の立毛面を順目方向及び逆目方向の各方向にシールブラシで整毛した。そして、整毛された立毛面の18mm×24mmの範囲を高輝度LEDから照射された構造化照明光により、400万画素モノクロC-MOSカメラで12倍の倍率で歪みの生じた縞投影画像撮影を行い、各方向における算術平均高さ(Sa)、及び、平均高さから100μm以上の高さを有する山頂点密度(Spd)を求めた。なお、立毛が倒れる方向を順目方向、立毛が起き上がる方向を逆目方向とした。測定は3回行い、その平均値を各数値として採用した。図3に実施例1で得られた立毛調人工皮革の表面を上記のように測定したときの3D画像を示す。図3(a)は順目方向、図3(b)は逆目方向である。
[立毛面の摩擦後品位]
得られた立毛調人工皮革の立毛面をマーチンデール測定(JIS L 1096)の逆マーチンデール測定を行った。具体的には、無荷重状態で台座にセットされた立毛調人工皮革の原反の立毛面を標準摩擦布SM25で50回摩擦し、そのときの外観を次の基準で判定した。
A:摩擦した後において、順目方向及び逆目方向に整毛したときに、均質で緻密な外観であった。
B:摩擦した後において、逆目方向に整毛したときにボツボツとした凹凸感や、極細繊維が粗になって下地が見えるようなドライタッチで不均質な粗い外観が明らかに現れた。
実施例1において、単繊維繊度の設計値が0.30dtexの極細繊維を形成した代わりに、単繊維繊度の設計値が0.25dtexの極細繊維を形成した以外は同様にして立毛調人工皮革を得、評価した。結果を表1に示す。
実施例1において、単繊維繊度の設計値が0.30dtexの極細繊維を形成した代わりに、設計値が単繊維繊度0.20dtexの極細繊維を形成し、また、ウェブ絡合シートの形成において積重体を4189パンチ/cm2でニードルパンチ処理する代わりに、4277パンチ/cm2でニードルパンチ処理した以外は同様にして立毛調人工皮革を得、評価した。結果を表1に示す。
実施例1において、単繊維繊度の設計値が0.30dtexの極細繊維を形成した代わりに、単繊維繊度の設計値が0.10dtexの極細繊維を形成し、また、ウェブ絡合シートの形成において積重体を4189パンチ/cm2でニードルパンチ処理する代わりに、3745パンチ/cm2でニードルパンチ処理した以外は同様にして立毛調人工皮革を得、評価した。結果を表1に示す。
実施例1において、単繊維繊度の設計値が0.30dtexの極細繊維を形成した代わりに、単繊維繊度の設計値が0.08dtexの極細繊維を形成し、また、ウェブ絡合シ ートの形成において積重体を4189パンチ/cm2でニードルパンチ処理する代わりに、3745パンチ/cm2でニードルパンチ処理した以外は同様にして立毛調人工皮革を 得、評価した。結果を表1に示す。
実施例4において、第二の高分子弾性体を付与する工程においてポリウレタン溶液を塗布する代わりに、ポリウレタンエマルジョンを塗布した以外は同様にして立毛調人工皮革を得、評価した。結果を表1に示す。
実施例1において、第二の高分子弾性体を付与する工程を省略した以外は同様にして立毛調人工皮革を得、評価した。結果を表1に示す。また、図4に比較例1で得られた立毛調人工皮革の表面を上記のように測定したときの3D画像を示す。図4(a)は順目方向、図4(b)は逆目方向である。
実施例1において、第二の高分子弾性体を付与する工程を省略し、さらに、立毛調人工皮革基材の裏面への難燃処理と収縮加工処理を施す工程を省略した以外は同様にして立毛調人工皮革を得、評価した。結果を表1に示す。
実施例2において、第二の高分子弾性体を付与する工程を省略した以外は同様にして立毛調人工皮革を得、評価した。結果を表1に示す。
実施例2において、第二の高分子弾性体を付与する工程を省略し、さらに、立毛調人工皮革基材の裏面への難燃処理と収縮加工処理を施す工程を省略した以外は同様にして立毛調人工皮革を得、評価した。結果を表1に示す。
Claims (9)
- 第一の高分子弾性体が含浸付与された、平均繊度0.20~0.5dtexの極細繊維の立毛を含む立毛面を有する不織布を含み、
前記立毛面は、ISO 25178に準じた面粗さ測定において、
算術平均高さ(Sa)が、順目方向及び逆目方向の両方向において30μm以下であり、
平均高さから100μm以上の高さを有する山頂点密度(Spd)が、順目方向及び逆目方向の両方向において30/432mm2以下であり、且つそれらの差(絶対値)が20/432mm2以下であること、
を特徴とする立毛調人工皮革。 - 前記立毛面における前記極細繊維は、第二の高分子弾性体を被着されている請求項1に記載の立毛調人工皮革。
- 前記立毛面における前記極細繊維は、少なくともその根元近傍に前記第二の高分子弾性体を被着されている請求項2に記載の立毛調人工皮革。
- 糸タフネスが平均8~40cN・%である請求項1~3の何れか1項に記載の立毛調人工皮革。
- 前記極細繊維は長繊維である請求項1~4の何れか1項に記載の立毛調人工皮革。
- 見掛け密度が0.4~0.7g/cm3である請求項1~5の何れか1項に記載の立毛調人工皮革。
- 第一の高分子弾性体が含浸付与された、平均繊度0.095~0.5dtexの極細繊維の立毛を含む立毛面を有する不織布を含み、さらに、織物,及び編み物からなる群から選ばれる少なくとも1種を含み、
前記立毛面は、ISO 25178に準じた面粗さ測定において、
算術平均高さ(Sa)が、順目方向及び逆目方向の両方向において30μm以下であり、
平均高さから100μm以上の高さを有する山頂点密度(Spd)が、順目方向及び逆目方向の両方向において30/432mm 2 以下であり、且つそれらの差(絶対値)が20/432mm 2 以下であること、
を特徴とする立毛調人工皮革。 - 請求項1~6の何れか1項に記載の立毛調人工皮革の製造方法であって、
第一の高分子弾性体が含浸付与された、平均繊度0.20~0.5dtexの極細繊維を含む立毛化処理される面を有する不織布を含む人工皮革基材を準備する工程と、
前記人工皮革基材の前記立毛化処理される面を立毛化処理して立毛面を形成する工程と、
前記立毛面における前記極細繊維に第二の高分子弾性体を被着させる工程と、
前記人工皮革基材を繊維の配向方向であるタテ方向に沿って収縮させた状態で熱セットする工程と、
を備えることを特徴とする立毛調人工皮革の製造方法。 - 第一の高分子弾性体が含浸付与された、平均繊度0.095~0.5dtexの極細繊維の立毛を含む立毛面を有する織物,及び編み物からなる群から選ばれる少なくとも1種を含む布帛を含み、
前記立毛面は、ISO 25178に準じた面粗さ測定において、
算術平均高さ(Sa)が、順目方向及び逆目方向の両方向において30μm以下であり、
平均高さから100μm以上の高さを有する山頂点密度(Spd)が、順目方向及び逆目方向の両方向において30/432mm2以下であり、且つそれらの差(絶対値)が20/432mm2以下であること、
を特徴とする立毛調人工皮革。
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