Heat-shrinkable polyester film roll
US6958178B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 2002 |
| Grant date | Oct 25, 2005 |
| Priority date | — |
| Expiry date | Mar 14, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/3179
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The heat-shrinkable polyester film rolls according to the present invention is characterized in that the film rolls have (1) a heat shrinkage percentage at 85° C. in the maximum shrinkage direction of 20% or more; (2) a melt resistivity at a temperature of 275° C. of 0.70×108 Ω·cm or less; (3) when samples thereof are cut off at an interval of about 100 m and the fluctuation in thickness in the maximum shrinkage direction is measured, a thickness distribution width represented by the following formula of respective samples of 7% or less.Thickness distribution width=(Maximum thickness−Minimum thickness)/Average thickness×100Container-wrapping films excellent in processability and printability can be produced from the heat-shrinkable polyester film rolls in high yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.