| 摘要 |
A needle valve nozzle for an injection mould has a nozzle body with at least one melt channel that terminates in a nozzle mouthpiece and a fluidic connection to a mould cavity formed by a mould insert. A shut-off needle penetrates the melt channel and nozzle mouthpiece and can be displaced between open and closed positions. At least one infeed cone is provided upstream of a seal seat to centre the shut-off needle, the lower end of which forms a shut-off part. The nozzle mouthpiece consists of a material with high thermal conductivity, with the infeed cone configured in a centering body consisting of wear-resistant material and running concentrically with the longitudinal axis of the needle valve nozzle. The entering body is held against and/or in the nozzle mouthpiece in a positive-fit and its end section forming an outlet for the melt can be engaged with the mould insert.
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