PURPOSE: To prevent inner surface defects from generating by a method wherein anti-blocking agent particles are contained in a copolymer polyester film, and the anti-blocking agent particles are buried under the film surface.
CONSTITUTION: A biaxially oriented film which is composed of a copolymer polyester film 4, of which main component is ethylene telephthalate unit and which contains a small quantity of other ester unit and of which melting point if 170 - 252°C, and which also contains anti-blocking agent particles 5 is heat bonded at least on one side, which becomes the inner surface of a can, of a metallic base 2 directly or through a primer for bonding, and thus a laminated body 1 is manufactured. And at least the film surface of this laminated body 1 is heated to a temperature which is at or higher than the melting point of the copolymer polyester, and then quenched, and the anti-blocking agent particles 5 are buried under the film surface, and contracting or contracting-stroking process is applied to the laminated body 1 after the treatments. By doing this, inner surface layer defects such as pin hole crack, fracture, exfoliation, etc. can be prevented from generating.
HAYASHI NOBUYUKI
IWAI TAKASHI
SHIBUE MASATSUNE
| JPH01192545A | 1989-08-02 | |||
| JPH01136738A | 1989-05-30 | |||
| JPS60168643A | 1985-09-02 |