Title:
HEAT-SHRINKABLE POLYESTER-BASED FILM, AND PACKAGE
Document Type and Number:
WIPO Patent Application WO/2017/029999
Kind Code:
A1
Abstract:
[Problem] To provide a heat-shrinkable polyester-based film which has sufficient thermal shrinkage properties in a main shrinkage direction that is the longitudinal direction, has reduced fluctuations in the degree of width-direction shrinkage along the film-width direction, has a small angle of molecular orientation, and is hence less apt to crease or deform upon shrink finishing.
[Solution] A heat-shrinkable polyester-based film characterized by satisfying the following requirements (1) to (4): (1) the degree of hot-water shrinkage in the film main-shrinkage direction through 10-second treatment in 98°C water is 50% or greater; (2) when the film is sampled at intervals of 100 mm along the film width direction and all the samples are treated in 98°C water for 10 seconds to determine the degree of hot-water shrinkage in a direction perpendicular to the film main-shrinkage direction, then the fluctuations are 5% or less; (3) the absolute value of the angle of molecular orientation is 15 degrees or less; and (4) the refractive-index difference shown by the following equation is 0.06 or greater.
Refractive-index difference=(refractive index in main shrinkage direction)-(refractive index in direction perpendicular to main shrinkage direction)
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Inventors:
INOUE MSAFUMI (JP)
HARUTA MASAYUKI (JP)
HARUTA MASAYUKI (JP)
Application Number:
PCT/JP2016/072901
Publication Date:
February 23, 2017
Filing Date:
August 04, 2016
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
B29C61/06; C08J5/18
Domestic Patent References:
| WO2014021120A1 | 2014-02-06 | |||
| WO2014199787A1 | 2014-12-18 |
Foreign References:
| JP2009143043A | 2009-07-02 | |||
| JP2009227970A | 2009-10-08 | |||
| JP2008274160A | 2008-11-13 | |||
| JPH08244114A | 1996-09-24 |
Other References:
See also references of EP 3339000A4
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