Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – By casting liquids on a solid supporting or shaping surface
Patent
1994-03-01
1995-07-04
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
By casting liquids on a solid supporting or shaping surface
2642358, 2642902, B29C 5516
Patent
active
054297850
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.degree. 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.
REFERENCES:
patent: 3150433 (1964-09-01), Kampf
patent: 3231642 (1966-01-01), Goldman et al.
patent: 3510552 (1970-05-01), Tsuruta et al.
patent: 3932919 (1976-01-01), Hutzenlaub
patent: 4803027 (1989-02-01), Peiffer et al.
patent: 5051225 (1991-09-01), Hommes et al.
E. I. Du Pont de Nemours and Company
Tentoni Leo B.
LandOfFree
Method of making biaxially oriented thermoplastic films does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of making biaxially oriented thermoplastic films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making biaxially oriented thermoplastic films will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-758496