发明名称 |
PROCEDE DE PRODUCTION DE PELLICULES UNIFORMES ETIREES SELON DEUX AXES |
摘要 |
An improved method for producing a biaxially drawn thermoplastic film of substantially uniform thickness throughout its width has been discovered by controlling heat at the die opening where film is extruded by employing a plurality of heaters which do not exceed 3 inches in width mounted along the edge of the die opening, said heaters being responsive in relation to the thickness measurement of a plurality of loci across the width of the drawn sheet to maintain thickness of the film substantially constant. |
申请公布号 |
BE785422(A1) |
申请公布日期 |
1972.12.27 |
申请号 |
BE19720785422 |
申请日期 |
1972.06.26 |
申请人 |
CELANESE CORP., 522 FIFTH AVENUE, NEW YORK, N.Y., (E.U.A.), |
发明人 |
J.G.RICHARDSON. |
分类号 |
B29C47/00;B29C47/86;B29C47/88;B29C47/92;(IPC1-7):B29D/ |
主分类号 |
B29C47/00 |
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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