HEAT-SHRINKABLE POLYESTER FILM AND PACKAGE

摘要

Provided is a heat-shrinkable polyester film that suppresses deterioration of the shrink finish quality associated with a decline in performance during aging and does not loosen even after being used as a label. This heat-shrinkable polyester film comprising a polyester of a predetermined composition fulfills all of the following: (1) a ratio A1/A2 of the absorbance (A1) at 1340 cm-1 and the absorbance (A2) at 1410 cm-1 of the film measured by polarized ATR-FTIR from 0.45 to 0.75 or from 0.40 to less than 0.45 in either the widthwise direction or lengthwise direction of the film; (2) a ratio (shrinkage stress after 30 seconds/maximum shrinkage stress) of the shrinkage stress after 30 seconds when the film is heat shrunk for 30 seconds in 90°C hot air (shrinkage stress after 30 seconds) and the maximum shrinkage stress of from 75% to 100%; and (3) a hot-water shrinkage rate in the widthwise direction of from 30% to 55% when, after aging the film for 672 hours in a 30°C, 85% RH atmosphere, the aged film is dipped in 70°C water for 10 seconds.