| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermally shrinkable polyester film which can be used for labels using low temperature shrinkers, even when the transportation and storage conditions of the product are the same as those for general packaging materials, and can further reduce the wrinkles, warp and irregular shrinkage of the film, when shrunk. SOLUTION: This thermally shrinkable polyester film is characterized in that the shrinkage rate of the film in its main shrinkage direction is≥20%, when the film is dipped in 70°C hot water for five seconds and further that the decrease of the shrinkage rate is≤10%, after the film is stored at 30°C and in a relative humidity of 35% for 30 days. A resin used as the raw material of the thermally shrinkable polyester film is an ethylene terephthalate-based copolyester comprising 85 to 95 mol. % of terephthalic acid and 15 to 5 mol. % of isophthalic acid as a dicarboxylic acid component and≥55 mol. % of ethylene glycol as a diol component. COPYRIGHT: (C)2004,JPO |
