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公开(公告)号：US4994214A
公开(公告)日：1991-02-19
申请号：US372843
申请日：1989-06-29
IPC分类号： B29C35/08 , B29C47/00 , B29C53/32 , B29C55/06 , B29C55/12 , B29C55/14 , B29C61/06 , B29C71/02 , G03C1/795
CPC分类号： G03C1/7954 , B29C47/0021 , B29C55/06 , B29C55/14 , B29C61/06 , B29C71/02 , B29C2035/0822 , B29C47/00 , B29K2067/00 , B29K2105/256
摘要： A process of making biaxially oriented polyethylene terephthalate photographic film having a controlled amount of curl in the longitudinal direction, wherein the file is subjected to longitudinal stretching while being asymmetrically heated across its thickness, then wound into a stock roll, and the stock roll thus obtained is heat-tempered. The stock roll after heat-tempering may be longitudinally slit, cut and rewound into smaller rolls in a winding direction opposite to the direction of the longitudinal curl induced in the film during the longitudinal asymmetrical heat-stretching.
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公开(公告)号：US5028691A
公开(公告)日：1991-07-02
申请号：US535584
申请日：1990-06-11
IPC分类号： B29C35/08 , B29C35/16 , B29C37/00 , B29C55/00 , B29C55/06 , B29C71/02 , B29K67/00 , B29L7/00 , F26B5/14 , F26B13/28
CPC分类号： F26B13/28 , B29C35/16 , B29C37/0092 , F26B5/14 , B29C2035/0822 , B29C2035/1616 , B29C55/00
摘要： A process of cooling a heated polyethylene terephthalate film by applying cooling liquid to both surfaces of the heated film and, after the temperature of the film has decreased sufficiently, removing the cooling liquid from the film, wherein the cooling liquid has a pH value between 6 and 3.
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公开(公告)号：US5084227A
公开(公告)日：1992-01-28
申请号：US535532
申请日：1990-06-11
IPC分类号： B29C35/08 , B29C35/16 , B29C37/00 , B29C55/00 , B29C55/06 , B29L7/00 , F26B1/00 , F26B5/14 , F26B13/28
CPC分类号： B29C35/16 , B29C37/0092 , B29C47/0021 , F26B13/28 , F26B5/14 , B29C2035/0822 , B29C2035/1616 , B29C2035/1625 , B29C2791/001 , B29C47/0038 , B29C47/0057 , B29C55/00 , B29K2067/003
摘要： A process for cooling a heated polymer film by applying to both surfaces of the heated film, a cooling liquid adapted for wetting contact with the film surfaces. The viscosity of the layers of liquid adhering to the film surfaces is significantly reduced to facilitate removal of such liquid layers. The viscosity can be reduced by significantly raising the temperature of the adhering liquid layers after the film has been sufficiently cooled or by changing the adhering liquid to a different liquid of lower viscosity. Preferably, the liquid layers are removed for the film surfaces by conveying the liquid carrying film upwardly to cause the liquid layers to each form into a generally triangular shape with the vertex extending upwardly and blowing air stream downwardly against each such vertex.
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公开(公告)号：US4892689A
公开(公告)日：1990-01-09
申请号：US218919
申请日：1988-07-14
申请人： Jan B. Van Cappellen , Luc M. De Groot , Gery Vancoppenolle , Daniel G. Vandenbrande , Jan K. De Keyzer
发明人： Jan B. Van Cappellen , Luc M. De Groot , Gery Vancoppenolle , Daniel G. Vandenbrande , Jan K. De Keyzer
CPC分类号： G03C1/81 , B29B13/023 , B29C35/10 , B29C55/06 , B29C55/14 , G03C1/7954 , B29C2035/0822 , B29K2067/00 , B29L2031/7644 , Y10S264/65
摘要： In a known process of making biaxially oriented polyethylene terephthalate photographic film, a certain amount of curl in the longitudinal direction can be imparted to the film by carrying out the longitudinal stretching step of that process while the film is asymmetrically heated across its thickness to a temperature gradient Delta T across the film of at least 10.degree. C. while the longitudinal stretching tension applied to the film is less than 10 N/sq.mm.
摘要翻译： 在已知的制造双轴取向的聚对苯二甲酸乙二醇酯照相胶片的方法中，通过进行该过程的纵向拉伸步骤，可以在膜的长度方向上施加一定量的卷曲，同时将膜在其厚度上不对称地加热到温度 梯度Delta T跨膜至少10℃，而施加到膜上的纵向拉伸张力小于10N / sq.mm。
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