| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a polyester film-coated metallic sheet which shows excellent economy and superb plate working properties because the possibilities of a neck-in phenomenon during melt-extrusion are low and a foreign substance is hardly generated in an obtained molten resin film and ameliorates the content flavor of an obtained metallic can and hardly generates the defective appearance(the whitening of a polyester film) of the outer face of the metallic can in a hot water sterilization performed after the filling of the content. SOLUTION: In the manufacturing method for coating one side of the metallic sheet with a film (A) composed mainly of a crystalline polyester with a melting point of 180°C or higher and the other side with a film (B) consisting of a crystalline polyester with a melting point of 180°C or higher, the resin films (A) and (B) obtained by cooling/setting the molten resin film extruded in a laminar fashion under the state that olefin polymer flows join at both end parts of a T-die, are uniaxially stretched in a longitudinal direction, then the stretched resin films (A) and (B) are thermally set and the polyester films (A) and (B) are obtained by cutting/removing both end parts as one process. The polyester films (A) and (B) are laminated on the metallic sheet heated in a separate process as the other process. COPYRIGHT: (C)2004,JPO |
