发明名称 MANUFACTURE OF POLYARYLATE FILM
摘要 PURPOSE:To contrive prevention of generation of creases on the surface of a film, by a method wherein the film is held at a temperature falling within a specific range and an inflation method wherein a temperature difference is provided between the central part and an end part is performed. CONSTITUTION:Polyarylate resin is melted and extruded through an annular die, flattened by a flattening device after formation of a bubble with pressurizing gas and introduced into a pair of pinch rolls in succession, in an inflation method. A blow-up ratio is made 0.8-2.5 times, a temperature of polyarylate film passage through the flattening device and a space between the pinch rolls is made so that the same falls within a range of 140 deg.C-190 deg.C, and the same at the central part of the film is made higher by 10 deg.C-30 deg.C as compared with the same at an end part.
申请公布号 JPS6456530(A) 申请公布日期 1989.03.03
申请号 JP19870214670 申请日期 1987.08.27
申请人 OKURA IND CO LTD 发明人 KONDO KAZUO;MARUYAMA KAKUSHI;TATEISHI KENJI
分类号 B29C53/02;B29C55/28;B29K45/00;B29K67/00;B29L7/00 主分类号 B29C53/02
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