| 摘要 |
In an injection device 10 having a plunger 11 reciprocably inserted into a heating cylinder 16 , in which a molten material M is injected by the plunger 11 via a nozzle 21 , a sealing portion 13 set so that the molten material M is prevented from easily entering a gap A between the plunger 11 and an inner wall 32 of the heating cylinder 16 is provided on the portion of the plunger 11 , on the side of the nozzle 21 , and the portion of the sealing portion 13 , on the side of the nozzle 21 is a core keeping portion 14 provided so that an annular portion 20 which is formed on a front portion of the plunger 11 and is connected to a storage portion 19 of the molten material M is formed between the core keeping portion 14 and the inner wall 32 of the heating cylinder 16.
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