HEAT-SHRINKABLE POLYESTER FILM AND MANUFACTURING METHOD THEREOF

摘要

A heat-shrinkable polyester film is provided to prevent the distortion after the thermal shrinkage, the folding of end part, contraction crack, wrinkle after shrinkage and twisting. A heat-shrinkable polyester film is manufactured from a composition consisting of an ethylene terephthalate repeating unit 35~90 mole %, 2-methyl propylene terephthalate repeating unit ~40 mole %, and butylene terephthalate repeating unit 5~25 mole %. The heat shrinkage rate of any one direction selected from the longitudinal direction or the traverse direction is 30% or greater and the heat shrinkage rate of the vertical direction to the direction is 30% or less.