| 摘要 |
PROBLEM TO BE SOLVED: To mold a synthetic resin member 2 by a pin gate type molding method using a hot runner gate 6 which does not need a process for removing a runner member by cutting and does not produce vacuum voids etc., in the synthetic resin member 2 when a synthetic resin gear having a core bar 1 and the annular synthetic resin member 2 which surrounds the periphery of the core bar 1 and in which a cog is formed on the periphery is produced by insert molding and to prevent deterioration in characteristics by the incorporation of cold slug. SOLUTION: The gate G of the hot runner 6 is arranged at a position facing the end surface 12 of the core bar 1, a cold slug trap T is set at a position facing the gate G of the end surface 12, and a synthetic resin channel L connecting the gate G and a cavity C is formed in the end surface 12. With the core bar 1 held in a mold M, a synthetic resin is injected into the cold slug trap T through the hot runner 6 and then into the cavity C through the channel L to form the synthetic resin member 2. COPYRIGHT: (C)2006,JPO&NCIPI |
