| abstract |
An object of the present invention is to provide a heat-shrinkable polystyrene film having not only high shrinkage in the longitudinal direction, which is the main shrinkage direction, but also good sewing eye opening property and high toughness. In the heat-shrinkable polystyrene-based film of the present invention, the main shrinkage direction is in the longitudinal direction. The hot water heat shrinkage in the longitudinal direction when treated for 10 seconds in 90 ° C warm water, the hot water heat shrinkage in the width direction when treated for 10 seconds in 90 ° C warm water, and in the longitudinal direction in 80 ° C warm water. After the 10% shrinkage, the tear strength in the width direction and the breaking energy in the longitudinal direction and in the width direction are adjusted to be within a predetermined range, respectively. |