HEAT SHRINKABLE POLYOLEFIN FILM AND METHOD FOR PRODUCING THE SAME

摘要

It is intended to provide a heat shrinkable polyolefin film, which has a high shrinkability in a longitudinal direction as its main shrinkage direction, and has favorable shrink finish, perforated line openability and solvent adhesiveness. The film of the invention comprises a skin layer containing a cyclic polyolefin resin as a major component and a core layer containing an acyclic polyolefin resin as a major component laminated to each other, and the main shrinkage direction of the film is a longitudinal direction. Further, a ratio of the thickness of the skin layer to the thickness of the entire film, a hot water heat shrinkage ratio in a longitudinal direction measured after 10-second treatment in 90°C hot water, a hot water heat shrinkage ratio in a width direction measured after 10-second treatment in 70°C to 90°C hot water, a rectangular tear strength in a width direction measured after 10% shrinkage in a longitudinal direction in 80°C hot water are adjusted to fall within respective specified ranges.