Plastification and injection unit with back-flow barrier

Details Plastification and injection unit with back-flow barrier Plastification and injection unit with back-flow barrier

2011-07-05

2011-07-05

Heitbrink, Tim (Department: 1744)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With accumulator, trap chamber, or serially arranged valves...

C425S132000, C425S561000

Reexamination Certificate

active

07972131

ABSTRACT:
A plastification and injection unit in injection-molding machines for processing of polymer materials, for example rubber, has a plastification screw that is disposed so as to rotate in a screw cylinder, which simultaneously represents the injection piston. The screw cylinder is disposed in an injection cylinder, in an axially displaceable manner. The injection cylinder can be connected with the sprue channel of an injection-molding die by way of a nozzle, and the injection piston has a back-flow barrier. The screw is axially displaceable in the screw cylinder by means of a separate drive. The screw tip projects out of the screw cylinder and has a closure body having a sealing surface for contact with the face surface of the screw cylinder.

REFERENCES:
patent: 3020591 (1962-02-01), Breher et al.
patent: 4592721 (1986-06-01), Charlebois et al.
patent: 5167971 (1992-12-01), Gill et al.
patent: 5380186 (1995-01-01), Hettinga et al.

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