公开(公告)号：US20030025237A1

公开(公告)日：2003-02-06

申请号：US10022085

申请日：2001-12-17

Applicant: UNITIKA LTD.

Inventor： Kenji Tsubouchi ,  Fumihiko Hosokawa

IPC: B29C047/88

CPC classification number: B29C55/12 ,  B29C47/0021 ,  B29C47/8845 ,  B29C47/8875 ,  B29C47/92 ,  B29C2947/92514 ,  B29C2947/9259 ,  B29C2947/92647 ,  B29C2947/92704 ,  B29C2947/92923 ,  B29K2077/00

Abstract: The present invention provides a method for industrially stably producing a stretched polyamide film having uniform properties at a high speed. The polyamide film production method comprises the steps of: extruding a molten polyamide resin from a die into a sheet form on a rotary cooling roll having a roughened surface; pressing the sheet against the surface of the cooling roll with an air layer being present between the cooling roll and the sheet by blowing air onto the sheet from an air knife apparatus for cooling the sheet, the air layer having a widthwise thickness distribution such that an average air layer thickness Te in lateral edge regions of the sheet is greater than an average air layer thickness Tc in a middle region of the sheet; and biaxially stretching the sheet.

Abstract translation: 本发明提供一种工业上稳定地制造高速均匀性的拉伸聚酰胺薄膜的方法。 聚酰胺薄膜制造方法包括以下步骤：将熔融聚酰胺树脂从模具中挤出成具有粗糙表面的旋转冷却辊; 通过从用于冷却片材的气刀装置将空气吹送到片材上，通过在冷却辊和片材之间存在空气层来将片材压靠在冷却辊的表面上，空气层具有横向厚度分布，使得 片材的侧边缘区域中的平均空气层厚度Te大于片材的中间区域中的平均空气层厚度Tc; 并双轴拉伸片材。