The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2025
Filed:
Jul. 01, 2021
Toyobo Co., Ltd., Osaka, JP;
Shintaro Ishimaru, Tsuruga, JP;
Masayuki Haruta, Tsuruga, JP;
TOYOBA CO., LTD., Osaka, JP;
Abstract
[PROBLEMS] It is an object of the present invention to provide a heat-shrinkable polyester-based film roll which can reduce defects caused during a heat shrinking step due to the variation of a heat shrinkage rate in the heat-shrinkable polyester-based film roll having the longitudinal direction as the main shrinkage direction, specifically, defects of the film when covering an object by a wrap-around method and heat-shrunk. [SOLUTIONS] A heat-shrinkable polyester-based film roll, comprising a core; and a heat-shrinkable polyester-based film having a longitudinal direction as a main shrinkage direction that is wound around the core; wherein the film (roll) satisfy predetermined polyester composition, and all samples cutout every about 100 m have a heat shrinkage rate measured by immersion in hot water of 90° C. for 10 seconds of 30% or more and 80% or less and ±3% or less of an average in the longitudinal direction.