| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermally shrinkable polyester-based film roll in which the variations of the thermal shrinkage behaviors of the long film wound on the film roll are reduced, and to provide a method for producing the same. SOLUTION: This film roll produced by winding up the thermally shrinkable polyester-based film is characterized in that the average value of the maximum shrinkage direction thermal shrinkage rates of samples prepared by cutting the thermally shrinkable polyester-based film at an approximately equal distance in the longitudinal direction is≥75%, when immersing the samples in 85°C hot water for 10 seconds and then pulling up the samples, and the thermal shrinkage rates of all the samples are within a range of±5 % of the average thermal shrinkage rate. COPYRIGHT: (C)2005,JPO&NCIPI |
