发明名称 |
Thermoplastic resin film and process for producing the same. |
摘要 |
A thermoplastic resin film has a variation in thickness of the film in the longitudinal direction of not more than 5% and a ratio "Pw1/PwT" of the sum of spectral intensities of wave-number components present in the wave-number range of 0.15 to 0.45 (1/m) (Pw1) to the sum of spectral intensities of the full wave-number range (PwT) determined when a wave form of the variation in thickness is subjected to analysis of Fourier transformation of not more than 0.20, and/or a variation in thickness of the film in the longitudinal direction of not more than 5% and a ratio "Pw2/PwT" of the sum of spectral intensities of wave-number components present in the wave-number range of 1.00 to 2.00 (1/m) (Pw2) to the sum of spectral intensities of the full wave-number range (PwT) determined as described above of not more than 0.15. A process for preparing a film which may have either of the above characteristics comprises supplying a thermoplastic resin to a die after heating and melting it at a temperature of not lower than a melting-finishing temperature "Tme"; extending the resin in a manifold of the die in the width direction of the die; cooling the resin in a land of the die at a temperature of lower than the melting-finishing temperature "Tme" and not lower than a crystallization starting temperature caused in cooling "Tcb"; and extruding the resin from the die. |
申请公布号 |
EP0676269(A3) |
申请公布日期 |
1996.03.20 |
申请号 |
EP19950302292 |
申请日期 |
1995.04.06 |
申请人 |
TORAY INDUSTRIES, INC. |
发明人 |
MIYAKAWA, KATSUTOSHI;TOYODA, KATSUYA;YAMAMOTO, AKIKO;TSUNASHIMA, KENJI;IEKI, TOSHIYA |
分类号 |
B29C47/14;B29C47/86;B29C47/88;B29D7/01;B41N1/24 |
主分类号 |
B29C47/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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