| 摘要 |
PROBLEM TO BE SOLVED: To prevent the leakage of a molten resin to a mold structure part in a mold even when the resin is injected with all valve gates in the mold closed. SOLUTION: A mold is equipped with a cavity mold 1, a core mold 3 which forms a molding cavity 2 between it and the mold 1, a sprue bush, a hot runner block 5 connected with the sprue bush, and valve gates 6 installed between the hot runner block 5 and the molding cavity 2, The valve gate 6 has a valve body 7 having a resin passage 7a and a seat part passage 7c, valve pins 9 inserted forward/backward movably into the resin passage of the hot runner block 5, and the resin passage and seat part passage of the valve body 7. The valve pin 9 has a tip part 9b which is engaged with the seat part passage of the valve body 7 by being moved forward/backward by an actuator 10 and a connection shaft part 9c which is connected the rear side of the tip part 9b and located at the position of the seat part passage of the valve body 7 by being moved forward by the actuator 10 and is thinner and longer than the seat part passage.
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