MANUFACTURING METHOD OF HEAT-SHRINKABLE POLYESTER FILM

PROBLEM TO BE SOLVED: To provide a manufacturing method of a heat-shrinkable polyester film in which shrinkage finish properties are suitable, when it is made a label for display which is loaded to the body of a bottle or the like, there is no distortion in the ends, and which has light interception properties even if printing working is not given. SOLUTION: The manufacturing method of a heat-shrinkable polyester film is a manufacturing method of a film which mainly consists of a polyester resin, and the heat-shrinkable polyester film comprises a three-layer object in which to both surfaces of a cavity containing layer which consists of a polyester resin containing inactive particles and a non-compatibility plastic, film layers which have fewer cavities than the cavity containing layer or do not contain cavities, wherein the all light transmittance of the film are 40% or less, the warm water shrinkage ratio of the maximum shrinkage direction at 80°C is 65% or more, and the warm water shrinkage ratio of the direction which intersects perpendicularly with the maximum shrinkage direction at 80°C is 2% or less. COPYRIGHT: (C)2008,JPO&INPIT