| 摘要 |
<p>The present invention relates to an injector device for injecting thermoplastic material. The device comprises a dispenser ( 8 ) feeding a transit passage ( 12 ) of an injector nozzle ( 7 ) with thermoplastic material, said passage opening out into the mold cavity ( 2 ) and being capable of being closed by a sliding needle ( 21 ). The needle ( 21 ) presents an extender ( 24 ) which passes through the dispenser ( 8 ) into ambient air via guide means ( 38 ) in order to co-operate with controlled means ( 30 ) for moving the needle ( 21 ). Sealing is provided between the extender ( 24 ) and the guide means ( 38 ) by the thermoplastic material itself, which material leaks between them from the dispenser ( 8 ) and accumulates in an annular groove ( 43 ) in one of them. The invention is applicable to injection molding devices.</p> |
