| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystalline resin extrusion molded article of which the major component is a crystalline thermoplastic resin, its manufacturing method, and a composite molded article using the molded article. SOLUTION: The molded article 100 is constituted with a crystalline resin such as a polyamide resin as the major component, and the degree of crystallinity of the surface layer part 102 is suppressed compared with the internal part 104. The molded article 100 is obtained, e.g., by feeding a molding material under a molten state to a molding material channel reaching the channel outlet of a sizing device from the orifice of an extrusion die, and extruding the molding material from the channel outlet by rapidly cooling the surface layer area (part being contact with the channel internal wall) of the molding material to a temperature zone being not more than the temperature wherein the crystallization speed of the resin is highest while passing the channel. By applying a crystallization accelerating process (e.g., a process for keeping the temperature zone at±20°C of the temperature wherein the crystallization speed is highest) at an arbitrary time, the degree of crystallinity of the surface layer part 102 of the molded article 100 and/or the overall molded article can be increased. COPYRIGHT: (C)2004,JPO |
