A HEAT-SHRINKABLE POLYESTER FILM ROLL

摘要

A heat-shrinkable polyester film roll obtained by winding a heat- shrinkable polyester film, characterized by satisfying the following requirements (1) and (2): (1) when samples cut out of the film at nearly the same intervals in the lengthwise direction are immersed in 85°C water for 10 seconds and taken out therefrom and then immersed in 25°C water for 10 seconds and taken out therefrom, each sample has a degree of thermal shrinkage in the maximum-shrinkage direction of 20% or higher; and (2) the polymer used as a material for the film comprises major structural units and one or more kinds of minor structural units; when the samples are examined for the content of the main minor structural units which are the units contained in the largest amount of all minor structural units, then the content of the main minor structural units in each sample is 7 mol% or higher based on all structural units; and when these values are averaged, the content of the main minor structural units in each sample is within the range of ±2 mol% based on that average.