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US 2003/0170427 A1Published application
Heat-shrinkable polyester films and labels
AssigneeToyo Boseki Kabushiki Kaisha
InventorsHideki Ito, Norimi Tabota, Hiroshi Nagano
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AssigneeToyo Boseki Kabushiki Kaisha
InventorsHideki Ito, Norimi Tabota, Hiroshi Nagano
Estimating the term…
An object of the present invention is to provide a heat-shrinkable polyester film suitable for use as a label for shrink-wrapping of bottles, having an appearance of Washi paper, and almost free problems such as crinkling, shrinkage shading, and deformation due to heat shrinkage. The heat-shrinkable polyester film of the present invention is characterized by having variations in film thickness of 3 μm or more per cm both in the maximum shrinkage direction and in the direction orthogonal to the maximum shrinkage direction, and by comprising a layer having voids with an average void diameter of 15 μm or more in vicinity of a center part in film thickness direction and at least one surface layer having voids with an average void diameter of less than 5 μm.
A heat-shrinkable polyester film having a variation in film thickness of 3 μm or more per cm both in a maximum shrinkage direction and in a direction orthogonal to the maximum shrinkage direction, the film comprising a layer having voids with an average void diameter of 15 μm or more in vicinity of a center part in a film thickness direction and at least one surface layer having voids with an average void diameter of less than 5 μm.
Dependencies are inferred from the claim text.