Film embossing process
AssigneeFuji Photo Film Co., Ltd.
InventorsKikuo Yamagis, Hiroshi Okuyama, Hideo Kawaguchi
Life of this patent
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Abstract
A film embossing process of roughening a lateral edge of a thermo-plastic film by mechanically deforming said lateral edge. The lateral edge is subjected to the film embossing process at a temperature of from the glass transition temperature (Tg) of the film to the temperature of (tg+60.degree. C.). Subsequently the film is subjected to heat treatment at a temperature higher than the temperature of said film embossing process by at least 10.degree. C. to 30.degree. C.
Claims4
A film embossing process for roughening a lateral edge of a thermo-plastic film by mechanical deformation, to produce embossed film, comprising the steps of;
- subjecting the lateral edge of said thermo-plastic film to an embossing process at a temperature in the range of Tg to Tg+60.degree. C., where Tg is the glass transition temperature to produce an intermediate film and, heat treating said intermediate film for a period of time in the range of from 30 to 600 seconds at a temperature exceeding the temperature of the film embossing step by approximately 10.degree. C. to 30.degree. C., wherein said process alleviates wavey pleating in said embossed film.
Dependencies are inferred from the claim text.