| 摘要 |
PURPOSE:To prevent peeling or cracking and to improve flavor resistance by forming a film of a polyester material having the acid content of specific ratios of isophthalic acid terephthalic acid and/or orthophthalic acid, and glycol content of specific number of carbons, heat treating it, and setting its specific weight by a MicroRaman method to a specific value or less. CONSTITUTION:The acid content of polyester film for coating the interior of a metal can contains 50 - 95 mol% of telephthalic acid, and 50 - 5mol% of orthophthalic acid, and glycol content of 2-5C, and its specific weight by a MicroRaman method when it is heat treated under temperature conditions of 210 deg.C and 2 minutes is set to 1.350 or less. When the film is laminated on the inner face of the can, the film is laminated on a metal plate before it is molded in a can shape, and entered to a can manufacturing step. Accordingly, the operations are largely simplified to enhance its productivity. |
