| 摘要 |
<p>The invention relates to a needle-sealed nozzle (10) for an injection mould whose injection nozzle (20) for introducing a fluid molten material (S) into a mould cavity (50) can be sealed on the end thereof by a closing needle (30). Said closing needle is provided with an injection channel (60) extending to an outlet orifice (62) for injecting a fluid (F) into the molten material (s) which is introduced into the mould cavity. Said outlet orifice is formed on the end face (34) of the closing needle for the molten material and can be closed by a fluid closing needle (64) which is axially displaceable in the closing needle for the molten material (30). Said closing needle for the molten material (30) can be moved from an opening position to a first and second closing position by a drive (40) For this purpose, the cylindrical closing part (33) of the closing needle (30) enters, in an accurately adjusted manner, a sealing seat (D) which is preferably formed in the injection nozzle (20) or in the end bit (23) of the nozzle. In order to inject a fluid, theclosing needle for the molten material (30) is placed in the first closing position and extends by the end thereof on the nozzle side towards the mould cavity (50) in such a way that the outlet orifice (62) for fluid (F) reaches the molten material (S) introduced in the mould cavity (50). The fluid being injected, the molten material (S) is extracted from the injection nozzle (20), if necessary and introduced in an injection hole (I) created by the fluid injection. For this purpose, the closing needle for the molten material (30) is displaced to the second closing position, the injection hole (I) being closed with the supplied molten material (s).</p> |
