| 摘要 |
PROBLEM TO BE SOLVED: To improve productivity by improving the structure of an inert gas introduction part, preventing the intrusion of a resin, and shortening a cycle time. SOLUTION: A bush housing part 13 for housing a sprue bush 12 is installed in a molding die 11, the sprue bush 12 is housed slidably to the right and the left in Fig. in the housing part 13, the outlet 15 of a gas passage for introducing the inert gas such as nitrogen gas is made to face the housing part 13, and the outlet 15 can be opened/closed by the sliding action of the sprue bush 12. First, the sprue bush is slid to open the outlet, and the inert gas is introduced into a cavity. Since the outlet is opened, the gas can be introduced in a short time. Next, the sprue bush is slid, the outlet is closed, and the resin is injected into the cavity. Since the outlet is closed, the resin is prevented from entering the gas passage.
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