HEAT-SHRINKABLE POLYESTER FILM AND PACKAGES

摘要

Provided is a heat-shrinkable polyester-based film having: a slow shrinkage speed; a shrinkage rate that increases gently with the increase of temperature; a large shrinkage stress; and an excellent shrinkage finish. This heat-shrinkable polyester-based film is characterized in that: the ratio (A1/A2) between the absorbancy (A1) at 1340 cm−1 of the heat-shrinkable polyester-based film measured by the polarized ATR-FTIR method and the absorbancy (A2) at 1410 cm−1 is from 0.65 to 0.9 in the main shrinkage direction of the film and from 0.45 to 0.75 in the direction orthogonal to the main shrinkage direction; and the warm-water heat shrinkage rate for when the film is immersed in 90-degree warm water for 10 seconds is from 40% to 60% in the main shrinkage direction of the film and from 0% to 12% in the direction orthogonal to the main shrinkage direction.

主权项

1. A heat-shrinkable polyester film, having a ratio A1/A2 of an absorbancy A1 at 1340 cm−1 to an absorbancy A2 at 1410 cm−1 obtained when measured by a polarized ATR-FTIR method of not less than 0.65 and not more than 0.9 in the main shrinkage direction of the film and of not less than 0.45 and not more than 0.75 in the direction orthogonal to the main shrinkage direction, and a hot-water heat shrinkage obtained when immersed in hot water at 90° C. for 10 seconds of not less than 40% and not more than 60% in the main shrinkage direction of the film and of not less than 0% and not more than 12% in the direction orthogonal to the main shrinkage direction.