Title:
熱収縮性ポリエステル系フィルムおよび包装体
Document Type and Number:
Japanese Patent JP6551419
Kind Code:
B2
Abstract:
The present invention provides a heat-shrinkable polyester film which has sufficient heat shrinkage properties in a main shrinkage direction that is the longitudinal direction, in which a variation in shrinkage in the width direction is small in the width direction of the film, and wrinkles and strains are less likely to be generated at the time of shrinkage finishing due to a small molecular orientation angle. The present invention has the following constitution.
1. A heat-shrinkable polyester film which satisfies the following requirements (1) to (4):
(1) the film has a hot-water shrinkage of 50% or more in a main shrinkage direction of the film when treated for 10 seconds in hot water of 98°C;
(2) when samples are taken at every 100 mm in a width direction of the film, and hot-water shrinkages in a direction orthogonal to the main shrinkage direction of the film are determined for all the samples when treated for 10 seconds in hot water of 98°C, a variation of the hot-water shrinkages is 5% or less;
(3) an absolute value of a molecular orientation angle is 15 degrees or less; and,
(4) a refractive index difference represented by the following equation is 0.06 or more: Refractive index difference = Refractive index in the main shrinking direction Refractive index in a direction orthogonal to the main shrinkage direction .
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| JPH0759655 | [Title of Invention] Film for shrink wrapping |
| JP3628633 | HEAT SHRINKING POLYSTYRENE TUBE |
Inventors:
Masafumi Inoue
Masayuki Haruta
Masayuki Haruta
Application Number:
JP2016559660A
Publication Date:
July 31, 2019
Filing Date:
August 04, 2016
Export Citation:
Assignee:
Toyobo Co., Ltd.
International Classes:
B29C61/06; B65D65/02; C08J5/18
Domestic Patent References:
| JP8244114A | ||||
| JP2008274160A | ||||
| JP2009143043A | ||||
| JP2009227970A |
Foreign References:
| WO2014021120A1 | ||||
| WO2014199787A1 |