METHOD FOR FORMING OUTER FILM ON THERMOPLASTIC RESIN BASE MATERIAL

摘要

PURPOSE:To reduce impairment to base material and outer film and obtain a sufficient adhesive strength therebetween in laminating the outer film on the aforesaid base material made from a thermoplastic resin and shaped into a required form. CONSTITUTION:A method for forming the outer film comprises a process a2 wherein a thermoplastic resin base material is softened by heating so as to be pressure formed, a process (b) wherein hot melt is applied to the joint faces of the shaped base material and the outer film material to be laminated thereon and a process c1 wherein the base material and the outer film material are both heated, joined together at the hot melt applied faces and pressed together with a higher pressure than that applied upon shaping the base material to bond together the base material and the outer film material.