B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/20 (2006.01) B29C 45/28 (2006.01)
Patent
CA 2255341
A valve-type nozzle is provided for use in hot runner systems through which a plastic material melt is fed under high pressure to a separable and coolable tool having at least one mould cavity for injection-moulded items. The nozzle is heatable and comprises at least one needle valve supported by sliding guides within the nozzle, the arrangement being such that the melt fed through a material pipe passes around at least a lower section of the needle valve. The nozzle further comprises upstream of the mould cavity in a antechamber at least one outlet adapted to receive a closely fitting needle end. The needle valve includes, in the lower section upstream of the needle end, a pressure-relief means that is in direct flow-connection with the antechamber. The pressure-relief means comprises in a guide piece at least one branch-off bore that runs radially at an angle of 90° to the longitudinal direction of the needle valve.
Fetherstonhaugh & Co.
Gunther Heisskanaltechnik Gmbh
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