Injection molding machine
AssigneeSodick Co., Ltd.
InventorsShingo Taniguchi, Yasuhiro KITAMURA, Yusuke YAMAZAKI, Tadashi MORIKAWA
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Abstract
An injection device of an injection molding machine includes an injection cylinder, a plunger, and a seal cylinder. The seal cylinder has a seal surface facing the plunger, a front surface forming a front surface flow path, and an outer side surface forming a side surface flow path. Between the injection cylinder and a side surface of the plunger, a first clearance is provided which is a gap that allows a molding material to flow through. Between the seal surface and the side surface of the plunger, a second clearance is provided which is a gap smaller than the first clearance and is reducible by a pressure of the molding material generated during dwelling.
Claims14
An injection molding machine, comprising:
- a plasticization device to which a molding material comprising at least resin is supplied and which plasticizes the molding material;
- an injection device which meters and injects the molding material sent from the plasticization device and performs dwelling to apply a predetermined pressure to the molding material for a predetermined time;
- and
- a junction which connects the plasticization device and the injection device,
- wherein the plasticization device comprises:
- a plasticization cylinder to which the molding material is supplied;
- and
- a screw which is rotatably provided in the plasticization cylinder,
- wherein the injection device comprises:
- an injection cylinder to which the molding material is sent from the plasticization cylinder;
- a plunger which is provided to be advanceable and retractable in the injection cylinder;
- and
- a seal cylinder which is provided at a rear end of the injection cylinder and through which the plunger is inserted,
- wherein the seal cylinder comprises a seal part which seals between the injection cylinder and the plunger,
- wherein the seal part comprises:
- a seal surface which faces the plunger;
- a front surface which forms a front surface flow path that is a gap which allows the molding material to flow through between the injection cylinder and the front surface;
- and
- an outer side surface which forms a side surface flow path that is a gap which allows the molding material to flow through between the injection cylinder and the outer side surface,
- wherein a first clearance that is a gap which allows the molding material to flow through is provided between the injection cylinder and a side surface of the plunger, and
- a second clearance that is a gap smaller than the first clearance and is reducible by pressure of the molding material generated during dwelling is provided between the seal surface and the side surface of the plunger.
Dependencies are inferred from the claim text.