JP6757521B2 - 微多孔プラスチックフィルムの製造方法 - Google Patents
微多孔プラスチックフィルムの製造方法 Download PDFInfo
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- JP6757521B2 JP6757521B2 JP2017500564A JP2017500564A JP6757521B2 JP 6757521 B2 JP6757521 B2 JP 6757521B2 JP 2017500564 A JP2017500564 A JP 2017500564A JP 2017500564 A JP2017500564 A JP 2017500564A JP 6757521 B2 JP6757521 B2 JP 6757521B2
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- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
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Description
前記延伸を行う前後のローラーへの巻き付け角が実質的に同じであることを特徴とする請求項1に記載の微多孔プラスチックフィルムの製造方法を提供する。
図1は、本発明の一実施形態である微多孔プラスチックフィルムの製造工程の概略側面図である。
ゲル状シート12の厚みは、吐出量に応じた口金スリット部からの流速に対し、冷却ドラムの速度を調整することで調整するのが好ましい。
好ましくは、延伸ローラー群42〜横延伸工程5に張力計を設置して実測することで、より高い精度で速度比を調整し、張力の釣りあいをとることができる。
[実施例1]
図1の通り、上流側のニップローラー44の本数は、昇温ローラー群41から冷却ローラー群43まで合計10本とした。
[実施例2]
[比較例1]
[比較例2]
[延伸ローラー上での滑り]
×(不可):ローラーとシートの速度差が、ローラー回転速度に対して10%以上
△(可):ローラーとシートの速度差が、ローラー回転速度に対して5%以上10%未満
○(良好):ローラーとシートの速度差が、ローラー回転速度に対して5%未満。
[縦延伸工程の蛇行量]
縦延伸工程4における蛇行量を以下の基準で評価した。
×(不可):蛇行量が10mm以上。
△(可):蛇行量が5mm以上10mm未満。
○(良好):蛇行量が5mm未満。
[微多孔プラスチックフィルム物性および機械的性質]
ガーレー透気抵抗度は、王研式透気抵抗度計(旭精工株式会社製、EGO−1T)を使用して、JIS P8117に準拠して測定した。
○(良好):ガーレー透気抵抗度が230sec±20sec及び突刺強度6N以上
×(不可):上記範囲外
12 ゲル状シート(フィルム)
13 一軸延伸シート(フィルム)
14 二軸延伸シート(フィルム)
15 微多孔プラスチックフィルムロール
21 押出機
22 ギアポンプ
23 口金
31 第1冷却ドラム
32 第2冷却ドラム
4 縦延伸工程
41 昇温ローラー群
42 延伸ローラー群
43 冷却ローラー群
44 ニップローラー
5 横延伸工程
6 洗浄・乾燥工程
61 洗浄溶剤
7 再延伸熱処理工程
8 巻取工程
Claims (2)
- 希釈剤とポリオレフィン樹脂を押出機にて混練し、前記希釈剤が混練された樹脂を口金からシート状に吐出し、前記口金から吐出されたシートをドラム上で冷却固化した後、前記固化したシートを再び加熱して、複数のローラーによりシートの搬送方向に延伸し、前記シートの搬送方向に延伸したシートを冷却した後にシート両端をクリップにて把持してテンターに導入し、その後希釈剤を洗浄する一軸または二軸延伸微多孔プラスチックフィルムの製造方法において、
前記ポリオレフィン樹脂が超高分子量ポリエチレン樹脂を含み、前記複数のローラーの間にシートを延伸する区間が2つ以上あり、これら複数の延伸区間の延伸倍率が1.9倍以上であり、かつ、当該延伸倍率の平均値に対して各延伸区間の差異が±3%を超えないことを特徴とする、微多孔プラスチックフィルムの製造方法。 - 前記延伸を行う前後のローラーへの巻き付け角が実質的に同じである、請求項1に記載の微多孔プラスチックフィルムの製造方法。
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