| 摘要 |
PURPOSE: To provide a polyester lap film adapted to have excellent heat resistance and perfume component barrier properties, and simultaneously excellent oxygen gas barrier properties, steam barrier properties, strength and tearability, and as a lap for the simple package of food. CONSTITUTION: This laminated lamp film comprises at least one or more substantially amorphous polyester layer having a glass transition point of 30 deg.C or higher in such a manner that the sum of the thicknesses of the layers is 1/2 or more of the entire thickness of the film, and formulae 0.10<=R<=0.50 and 20<=V<=80 are simultaneously satisfied. In the formulae, R is the tearing resistance (kg-wt/μm) of the film, and V is the tear propagation velocity (mm/sec) of the film.
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