| 摘要 |
PROBLEM TO BE SOLVED: To reduce occurrence of a ring-like burr as much as possible by alleviating a wear of a gate bush with a simple structure. SOLUTION: A mold for injection molding comprises a cylindrical runner nozzle having a resin supply passage at an inside, a cylindrical gate bush internally mounted at other end of the nozzle and having a gate hole opposed to a cavity, and a valve pin arranged in the passage to open/close a gate hole. The bush is slidably provided along a longitudinal direction of the pin at an inner wall side of the nozzle. The mold further comprises a receiving part provided at a circumference of the gate hole of the bush to receive an outer periphery of a distal end of the pin when the pin is advanced, and an energizing means provided between the nozzle and the bush to energize the bush to an opposite side to a gate supply direction to be slidable in the resin supply direction by pressing the pin to the bush.
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