| 摘要 |
PROBLEM TO BE SOLVED: To maintain toughness, pinhole resistance, flex resistance, heat resistance or the like and obtain excellent appearance characteristics by setting lengthwise and crosswise heat shrinkage factors in a specified range under specified conditions. SOLUTION: A polyamide resin film used for a packaging material of liquid soup, flavoring material or the like, specifically the polyamide resin film excellent in appearance at the time of high-speed automatic filling, is manufactured so that a lengthwise heat shrinkage factor, when the film is retained in dry heat of 160 deg.C in 10 min., is 2.5-4.0%, and a crosswise heat shrinkage factor is 1.5-3.0%. The polyamide resin is a resin having a polyamide as main constituent, and a polyamide obtained by a polycondensation of a three- or more- membered ring lactam, a polyamide obtained by polycondensation of anω-amino acid, or the like is selected for the polyamide. And additives such as an anti- oxidizing agent, a light resistant agent, an anti-gelling agent, a lubricant, anti- blocking agent, or the like is blended as necessary.
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