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    • 4. 发明申请
    • Method for producing low birefringence plastic film
    • 低双折射塑料薄膜的制造方法
    • US20050077647A1
    • 2005-04-14
    • US10959255
    • 2004-10-06
    • Dennis CoyleKevin Capaldo
    • Dennis CoyleKevin Capaldo
    • B29C43/22C08J5/18G11B7/253B29C47/88
    • B29C43/222B29K2069/00B29K2995/0032C08J5/18C08J2369/00G11B7/2534
    • In one embodiment, an extrusion process can comprise: feeding a thermoplastic polycarbonate resin to an extruder; heating the resin in the extruder to a melt temperature that is above a glass transition temperature of the resin, thereby producing a melt of the thermoplastic polycarbonate resin; extruding the melted resin downwardly through an extrusion nozzle orifice having a slot configuration; passing the melted resin downwardly into a gap between two calendering rolls at least one of which has a highly polished surface, and wherein the calendering rolls are maintained at a roll temperature of less than the glass transition temperature; and cooling the thermoplastic polycarbonate resin film to below its glass transition temperature as the thermoplastic polycarbonate resin film advances through the gap.
    • 在一个实施方案中,挤出方法可以包括:将热塑性聚碳酸酯树脂进料到挤出机中; 将挤出机中的树脂加热到高于树脂的玻璃化转变温度的熔融温度,由此制造热塑性聚碳酸酯树脂的熔体; 将熔化的树脂向下挤出通过具有狭槽构型的挤出喷嘴孔口; 将熔融树脂向下通入两个压延辊之间的间隙,其中至少一个具有高度抛光的表面,并且其中压延辊保持在小于玻璃化转变温度的辊温度; 并且当热塑性聚碳酸酯树脂膜前进穿过间隙时,将热塑性聚碳酸酯树脂膜冷却至其玻璃化转变温度以下。