| 摘要 |
An injection nozzle assembly is used for molding a plurality of articles having accurate dimensions without causing a sink mark to appear in the molded article. The injection nozzle assembly comprises a body which is heated to a temperature higher than the melting point of thermoplastic material. A cylindrical bore is formed within the body, and an outlet port is formed at one end of said cylindrical bore. A plunger moves within the cylindrical bore between a first position near the outlet port to a second position which is remote from the outlet port. A first feed line supplies the molten thermoplastic material and a second feed line feeds high pressure through passageways that are formed within the body. The plunger is formed within a first passageway connecting the feed line with the outlet port when the plunger is moved to the second position. The pressure at the outlet port is reduced by the movement of the plunger from the first position to the second position.
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