Patent ID: 8329828

Claim:
A heat-shrinkable polyester film made of a polyester resin comprising ethylene terephthalate as a major constituent and containing at least one monomer component capable of forming an amorphous component as a glycol component being neither less than 1 mol % nor more than 12 mol %, wherein the heat-shrinkable polyester film shaped to extend longitudinally with a certain transverse dimension has a main shrinking direction being in a longitudinal direction thereof, and satisfies the following requirements (1)-(3): (1) a ratio of hot-water shrinkage in the longitudinal direction is more than or equal to 0% but not more than 5% where the heat-shrinkable polyester film is put in hot water at 80° C. for 10 seconds; (2) a ratio of shrinkage in the longitudinal direction is more than or equal to 30% but not more than 50% where the heat-shrinkable polyester film is put in a glycerin bath heated at 140° C. for 10 seconds; and (3) a ratio of shrinkage in a transverse direction orthogonal to the longitudinal direction is more than or equal to −5% but not more than 10% where the heat-shrinkable polyester film is put in a glycerin bath heated at 140° C. for 10 seconds.