Patent ID: 7497681
Filing Date: 2009-03-03
Classification: B29C

Abstract:
1. Needle valve nozzle ( 10 ) for an injection mould for producing injection moulded parts, comprising a nozzle body ( 20 ) that contains at least one melt channel ( 30 ) for a melt, said melt channel ( 30 ) terminating at or in a nozzle mouthpiece ( 40 ) and having a fluidic connection to a mould cavity of the injection mould that is formed by at least one mould insert ( 50 ), and comprising a shut-off needle ( 60 ) which penetrates the melt channel ( 30 ) and the nozzle mouthpiece ( 40 ) in such a manner that it is longitudinally displaceable and suitable to be moved from an open position into a closed position, with said shut-off needle ( 60 ) comprising or forming on its lower end a shut-off part ( 70 ) which engages in closed position into a sealing seat (D), and with at least one infeed cone ( 46 ) provided ahead of the sealing seat (D) for centring the shut-off needle ( 60 ), characterised in that the nozzle mouthpiece ( 40 ) is made from a highly heat-conductive material and substantially continues the melt channel ( 30 ) cylindrically, wherein the or each infeed cone ( 46 ) for the shut-off needle ( 60 ) is formed in a centring body ( 80 ) made from a wear-resistant material, said cone being mounted on and/or in the nozzle mouthpiece ( 40 ) by positive fit and wherein an end section ( 84 ) of the centring body ( 80 ) which forms an outlet opening ( 44 ) for the melt is engageable with the mould insert ( 50 ).