| 摘要 |
PROBLEM TO BE SOLVED: To obtain high gas barrier property and make retorting possible by layering an aluminum oxide film layer having a specified thickness and a transparent primer layer in sequence on one face of a transparent plastic base material and layering a specified thermoplastic resin layer thereon through adhesive. SOLUTION: On a surface of a base material 2 formed of a transparent plastic material, an aluminum oxide film layer 3 which is colorless and transparent and barriers off gases such as oxygen and steam and a transparent primer layer 4 for absorbing and damping mechanical stress such as tension and contraction at the time of drying of printing ink are layered in sequence. Further, as an adhesive section in forming a bag-like packing body, a polyolefin thermoplastic resin layer 5 is layered by using an adhesive such as a double fluid setting urethane resin. Accordingly, transparency and gas barrier property after the film is formed are excellent. Damage such as break of film is not generated for mechanical stress such as tension and contraction when the printing ink is dried in an after-treatment process, and the gas barrier property is maintained without deteriorating it also after it is retorted. |
