| 摘要 |
PURPOSE:To form a very beautiful surface even if a specific molding material is not used without making a mold temperature high, by a method wherein a specific composite layer is provided on the surface of a mold cavity. CONSTITUTION:In a mold cavity, a composite layer which is comprised of a surface layer A and intermediate layer B is fitted to a mold basic material forming the mold cavity. The layer A is selected out of nickle, nickle-chromium steel, chromium, constantan, aluminum, copper, a copper-beryllium alloy and zinc. Then the layer is a metallic compound layer wherein a temperature conductivity is at least 300X10<-4>m<2>/h. The layer B is comprised of a layer possessing the melting point which is higher by at least 20 deg.C than a temperature of themoplastic resin under a molten condition, used for molding and has the temperature conductivity of not exceeding 50X10<-4>m<2>/h. Hereby, even if a glass fiber added material is used without extending a molding cycle, a glass fiber exposed on the product surface can be prevented and a molded product having an extremely excellent external appearance and strength is obtained. |
