Needle nozzle having valve

Details Needle nozzle having valve Needle nozzle having valve

B - Operations, Transporting

29

F

18/703

B29F 1/03 (1980.01)

Patent

CA 1095676

ABSTRACT An injection nozzle for injection moulding purposes has a nozzle body with a feed passage opening which is normally closed by a needle valve. The injected resin, under high pressure, forces the needle valve to retract and open the nozzle. The improvement is a piston on the needle valve acted on by spring means to urge the needle valve to closed position, the needle valve having a valve element which, when the needle valve is fully opened, seals off the cylinder in which the piston moves, thereby to prevent entry of injection material into the cylinder. The cylinder may optionally have a charge of gas under high pressure in it, or a material which produces such a charge under the operating conditions of the nozzle.

273172

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