Title:
二軸延伸熱可塑性プラスチックフィルムの製造方法
Document Type and Number:
Japanese Patent JP3763844
Kind Code:
B2
Abstract:
A method is provided for the production of ultrathin films having a thickness of 2.5 microns or less, including film having a thickness as low as about 0.2 microns. Film of thermoplastic polymer, preferably polyester film, less than 25 microns in thickness and in thermal equilibrium with the surrounding air is simultaneously stretched at least twice and up to about five times its original dimensions in the machine and cross-machine directions under conditions such that thicker regions are maintained at an elevated temperature by radiant heating and at least a 0.1 DEG C. temperature differential is established between the thicker (hotter) regions and the thinner (cooler) regions of the film prior to stretching the film beyond its elastic limit. The ultrathin films produced according to this invention have acceptable uniform thickness necessary for commercial applications thus providing consistent electrical performance when used as the dielectric medium in miniature capacitors and uniform heat transfer characteristics suited for high resolution thermal transfer media or digital stencils.
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Inventors:
Jollyph, charles, nelson
Application Number:
JP52303595A
Publication Date:
April 05, 2006
Filing Date:
March 01, 1995
Export Citation:
Assignee:
DuPont Teijin Films U.S. Limited Partnership
International Classes:
B29C55/16; C08J5/18; B29C35/02; B29C35/08; B29K67/00; B29L7/00; C08L67/02
Domestic Patent References:
| JP61192526A | ||||
| JP54137076A |
Attorney, Agent or Firm:
Toshiaki Iwasaki
Yoshikazu Tani
Kazuo Abe
Yoshikazu Tani
Kazuo Abe