Largest contractile stress of the 75 in the main contractile direction

摘要

PROBLEM TO BE SOLVED: To provide a heat-shrinkable polyester film extremely excellent in natural shrinkage resistance, and hardly generating shrinkage deficiency when being heated at ≥80°C, especially a heat-shrinkable polyester film capable of forming an insulated gripping part of the insulated container by being quickly shrunk by heating when being used for the insulated container, and dispensing with storage under temperature control even in such a period that the outside air temperature rises.;SOLUTION: In this heat-shrinkable polyester film, the maximum shrinkage stress at 75°C in the main shrinkage direction of the film is ≥4.4 MPa and ≤12.0 MPa, and a shrinkage rate in the main shrinkage direction when the film is stored for 8 hours under the 60°C×40% RH atmosphere is ≤2.0%, and the shrinkage rate in the main shrinkage direction when the film is dipped for 10 seconds into warm water at 80°C is ≥10% and 80%.;COPYRIGHT: (C)2012,JPO&INPIT