Patent · US Active

Plastification and injection unit with back-flow barrier

US7972131B2 · kind B2 · utility

0Cited by

4References

5Claims

0Family size

Assignee

Klöckner Desma Elastomertechnik GmbH · DE

Inventors

Olaf Kuechler · Volkertshausen, DE
Edwin Baumann · Schifferstadt, DE
Volker Krell · Neuhausen ob Eck, DE

Key dates

Filing date	Nov 19, 2009
Grant date	Jul 5, 2011
Priority date	—
Expiry date	Dec 31, 2029

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C45/52
WIPO fieldOther special machines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.