MOLDED OBJECT FROM A CRYSTALLINE THERMOPLASTIC RESIN WITH HIGH GAS BARRIER PROPERTY AND PRODUCTION THEREOF

摘要

A molded article of a crystalline thermoplastic resin with high gas barrier properties, produced while optimizing the crystal orientation of the resin to give a product with a specified monoaxial monoplanar orientation, thus remarkably improving the gas barrier properties. The gas barrier properties can be drastically improved by optimizing the crystallinity and crystal orientation of the molded article by specifying the conditions of molding and heat treatment for crystallization and utilization a synergistic effect of the crystallinity and the crystal orientation. The molded article is used as the packaging or protective material of meat, processed animal and fish meat including ham and sausage, processed marine products including "kamaboko", retortable pouch, foods which must be shielded from moisture or oxygen, such as fish powder seasoning, powdery soup and rice cracker, curry powder, spice, vegetable, fruit, medicine and so forth. IMAGE