WÄRMESCHRUMPFBARE POLYSTYROLFOLIE UND HERSTELLUNGSVERFAHREN DAFÜR

摘要

An object is to provide a heat-shrinkabie polystyrene film that is high in shrinkability in the longitudinal direction that is its main shrinkage direction, excellent in perforated line openability, and has high toughness. The main shrinkage direction of a heat-shrinkable polystyrene film of the present invention is in a longitudinal direction. The hot-water heat shrinkage ratio in the longitudinal direction when the film is treated in hot water at 90°C for 10 seconds; the hot-water heat shrinkage ratio in a width direction when the film is treated in hot water at 90°C for 10 seconds; the right angle tear strength in the width direction per unit thickness after the film is shrunk by 10% in the longitudinal direction in hot water at 80°C; and the breaking energies in the longitudinal direction and the width direction, are each adjusted in a predetermined range.