| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat-shrinkable polyester film having a ground glass-tone appearance, capable of making more beautiful a picture print executed on a film by reflecting a light of a specific wavelength to provide high designing of iridescent metal luster, and having heat shrinking properties to enable sticking to a container such as a PET bottle. SOLUTION: The heat-shrinkable polyester film is formed by alternately stacking first layer each made of polyester (A) consisting essentially of ethylene terephthalate and having an average thickness of 0.05-3.5μm, and second layers each made of polyester (B) consisting essentially of ethylene-2, 6-naphthalene di-carboxylate and having a thickness of 0.005-1.0μm within the range of 31-1001 layers. A total thickness of the first layers based on a whole film thickness is 90-95%, and the thickness of each layer of the first layers continuously changes in a thickness direction. The film has haze of≥30%, and at least one reflection peak of reflectance≥25% in a reflectance curve of the wavelength range of 400-800 nm. A heat shrinking rate when the film is left in a hot water of 80°C for 10 seconds is≥30% in one of longitudinal and width directions, and 0 to <10% as an absolute value in a direction orthogonal to such a direction. COPYRIGHT: (C)2009,JPO&INPIT
|
