PLASTICATION METHOD AND MOLDING METHOD FOR FIBER- REINFORCED THERMOPLASTIC RESIN

摘要

PROBLEM TO BE SOLVED: To provide a plastication method for a fiber-reinforced thermoplastic resin which can stabilize a plastication time while controlling the breakage of fibers contributing to the mechanical properties of an obtained molding in a plastication process, and to provide a molding method for molding the resin effectively. SOLUTION: In the plastication method for the fiber-reinforced thermoplastic resin, an injection molding machine has a barrel the temperature of which can be controlled individually in a plurality of zones, a hopper installed above one end on the upstream side of the barrel, and a screw which is installed in the barrel and has a compression ratio below 2. Pellets are supplied into the barrel through the hopper and melt-kneaded. The resin is plasticated under improved plastication conditions in which the feed of the resin in the barrel is controlled so that the plastication time of the first shot is 1.1-3 times as long as the plastication time of the first shot when the resin is plasticated under ordinary conditions. In the molding method, the resin is molded after being plasticated by the method. COPYRIGHT: (C)2004,JPO