| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a heat-shrinkable polyester film which has high shrinkability in the longitudinal direction as the main shrinkage direction, has a high mechanical strength in a width direction, moreover, hardly has wrinkles in a produced film roll and has good perforated line openability. <P>SOLUTION: In the heat-shrinkable polyester film, the main shrinkage direction is the longitudinal direction. In addition, the hot-water shrinkage ratio in the longitudinal direction when the film is treated in hot water at 90°C for 10 sec, the hot-water shrinkage ratio in the width direction when the film is treated in hot water at 90°C for 10 sec, the solvent adhesion strength and the natural shrinkage ratio after aging at 40°C and 65% RH for 700 hr or more are adjusted to fall in the predetermined ranges respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
