Title:
HEAT-SHRINKABLE POLYESTER-BASED FILM ROLL
Document Type and Number:
WIPO Patent Application WO/2021/085301
Kind Code:
A1
Abstract:
[Problem] To provide a heat-shrinkable polyester film roll wherein the occurrence of defects in a heat-shrinking step, such as wrinkles and vertical shrinkages caused by heat shrinkage rate variations within a film roll, is reduced even when containing a PET bottle recycled raw material. [Solution] The present invention provides a heat-shrinkable polyester film roll comprising a heat-shrinkable polyester-based film constituted by a polyester containing an isophthalic acid ingredient while containing between 5% by mass and 50% by mass inclusive of a PET bottle recycled raw material, the film roll being characterized by satisfying requirements (1) to (3). (1) The shrinkage rate in the main shrinking direction for film samples collected at a 100 m pitch in the roll length direction and immersed in hot water at 90°C for 10 seconds has a mean value of 40% or higher in the main shrinking direction, and the shrinkage rate for all samples falls within the mean value ± 3% inclusive. (2) The ratios of isophthalic acid contained within 100% by mole of all acid ingredients in the polyester constituting the film in film samples collected at a 100 m pitch in the roll length direction all fall within the mean value thereof ± 0.3% by mole inclusive. (3) The unevenness of thickness in the roll length direction is 20% or less.
Inventors:
INOUE MASAFUMI (JP)
HARUTA MASAYUKI (JP)
HARUTA MASAYUKI (JP)
Application Number:
PCT/JP2020/039726
Publication Date:
May 06, 2021
Filing Date:
October 22, 2020
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
B65D65/02; B29C61/06; B65H75/00; C08J5/18
Domestic Patent References:
| WO2019089698A1 | 2019-05-09 | |||
| WO2019188922A1 | 2019-10-03 |
Foreign References:
| JP2014065282A | 2014-04-17 | |||
| JP2005001287A | 2005-01-06 | |||
| JP2011140653A | 2011-07-21 | |||
| JPS5320737B2 | 1978-06-28 | |||
| JPS642954B2 | 1989-01-19 | |||
| EP2868688A1 | 2015-05-06 | |||
| JP5320737B2 | 2013-10-23 | |||
| EP3778727A1 | 2021-02-17 |
Other References:
See also references of EP 4053037A4
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