HEAT-SHRINKABLE POLYESTER FILM AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a heat-shrinkable polyester film capable of producing a transversely uniaxially shrinkable film excellent in shrinking characteristics at a high production rate. SOLUTION: This film is obtained by stretching an unoriented film at a≥2 draw ratio in the longitudinal direction so as to give≤0.008 birefringence followed by stretching at 3-6 draw ratio in the transverse direction, and has≤15% shrinkage in the longitudinal direction and≥30% shrinkage in the transverse direction when shrunk in hot water of 80°C for 10 seconds. The unoriented film is obtained by melt-extruding a polyester resin raw material having 2×108Ω-cm specific resistance at the molten state followed by film-forming by the electrostatic-applied cooling method. COPYRIGHT: (C)2004,JPO