METHOD FOR MANUFACTURING THICK-WALLED MOLDED ARTICLE

• Main Authors: MIZUHARA KAZUMI, TAKAHASHI HARUNORI
• Format: Patent
• Language: English
• Published: 07.12.2006
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a method for manufacturing a thick-walled molded article having no surface sink and void for a short molding time and stably. SOLUTION: The method for manufacturing the thick-walled molded article comprises the steps of; supplying thermoplastic resin pellets in synchronization with the rotating action of a screw in a cylinder 1 of an injection molding machine into the root part of the screw using a pellets supplying feeder 7, melting the thermoplastic resin in the cylinder 1 set at a temperature within the range of 50°C-80°C higher than its glass transition temperature, thereafter injecting into a die 9 having a hot runner system set at a temperature within the range of 50°C-80°C higher than its glass transition temperature, and cooling to harden in the die 9. COPYRIGHT: (C)2007,JPO&INPIT