HEAT-SHRINKABLE POLYESTER FILM ROLL AND PROCESS FOR PRODUCING THE SAME

摘要

A film roll of a heat-shrinkable polyester film characterized in that the heat-shrinkable polyester film meets the following requirements (1) and (2). (1) When samples are cut off therefrom at an almost equal interval along the longitudinal direction, and immersed in hot water at 85.degree.C for 10 seconds, subsequently in water at 25.degree.C and withdrawn, heat-shrinkage percentag es in the maximum shrinkage direction of all the samples are 20% or more. (2) When raw polymers used for production of the film above comprises of a major constitutional unit and one or more sub constitutional units different therefrom; and the content of the primary sub constitutional unit is determined, the content of the primary sub constitutional unit in each sample is more th an 7 mole % in 100% of all constitutional units, and when an average of the contents of the primary sub constitutional unit is calculated, the contents thereof of a ll the samples fall within a range of ~2 mole % relative to the average.