Heat-shrinkable polyester films
US6465063B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2001 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Oct 2, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Heat-shrinkable polyester films, each having a heat shrinkability of 40% or higher in the main shrinkage direction of the film after treatment in hot water at 80° C. for 10 seconds, the change of heat shrinkability in the main shrinkage direction of the film after treatment in hot water at 55-75° C. for 10 seconds before and after the film is left under an atmosphere at 40° C. for 160 hours being 15% or lower, exhibit beautiful shrinkage finish in appearance involving only rare occurrence of shrinkage spots, wrinkles, strains, folding and other defects during shrinkage in the step of shrinking with hot air, and in particular, exhibit a quite small lowering in shrinkage finish after a lapse of time for storage and have low spontaneous shrinkability; therefore, these films are suitably used for applications such as labels and cap seals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.