US 7,972,131 B2Granted

Plastification and injection unit with back-flow barrier

AssigneeKlöckner Desma Elastomertechnik GmbH

InventorsOlaf Kuechler, Edwin Baumann, Volker Krell

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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.

Claims5

Dependent claims

A plastification and injection unit in injection-molding machines for processing of polymer materials, comprising:

an injection cylinder adapted to be connected to a sprue channel of an injection molding die by way of a nozzle, said injection cylinder having a back-flow barrier;
a screw cylinder forming an injection piston and being disposed in the injection cylinder and being axially displaceable in the injection cylinder;
a plastification screw rotatably disposed in the screw cylinder;
and
a separate drive for axially displacing the screw in the screw cylinder,
wherein a screw tip is connected to said plastification screw, said screw tip projecting out of the screw cylinder, said screw tip having a closure body with a sealing surface for contact with a face surface of the screw cylinder to shut off flow of the polymer materials.

3 more elements

Dependencies are inferred from the claim text.