Manufacturing process for polyester film exhibiting low thermal shrinkage
US8591998B2 · kind B2 · utility
1Cited by
51References
20Claims
0Family size
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Key dates
| Filing date | Feb 9, 2007 |
| Grant date | Nov 26, 2013 |
| Priority date | — |
| Expiry date | Apr 30, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31797
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process in which a wound roll of biaxially oriented polyester film having a glass transition temperature (Tg (° C.)) is annealed at a temperature Ta (° C.) above Tg where Tg<Ta≦Tg+100 (° C.) for a time t after thermal equilibrium where 1 hour≦t≦72 hours and cooled, for the purpose of improving the shrinkage of said polyester film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.