Heat-shrinkable polyester film and package

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United States of America Patent

PATENT NO 9944012
SERIAL NO

15559738

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Importance

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Abstract

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The invention provides a heat-shrinkable polyester film in which the differences in physical properties in the width direction are reduced even if the film has a small thickness. The heat-shrinkable polyester film has a main shrinkage direction in a width direction of the film and has (1) a thickness of 6-27 μm; (2) a maximum value of the molecular orientation angle of 5 degrees or less; (3) a hot-water shrinkage at 90° C. in the width direction of the film 40-85%; (4) a difference between a maximum value and a minimum value of the hot-water shrinkage at 90° C. in the width direction of the film of 2% or less; and (5) a difference between a maximum value and a minimum value of the maximum shrinkage stress at 90° C. in the width direction of the film of less than 0.3 MPa.

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Patent Owner(s)

  • TOYO BOSEKI KABUSHIKI KAISHA T/A TOYOBO CO. LTD.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Haruta, Masayuki Tsuruga, JP 77 361
Tabota, Norimi Osaka, JP 45 639

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