Patent · US Expired

Apparatus for extruding plastic materials

US4995802A · kind A · utility

3Cited by

5References

10Claims

0Family size

Assignee

Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

Dietmar Muller · Fürstenfeldbruck, DE
Helmut Bauer · Schreiber, CA
Harald Franken · Karlsruhe, DE
Harry Seiter · Remchingen, DE

Key dates

Filing date	Jul 28, 1989
Grant date	Feb 26, 1991
Priority date	—
Expiry date	Jul 28, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S425/015
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

An apparatus for extruding plastic materials, particularly plastic explosives or propellants, has a casing, at least one pressing member moving therein, e.g. a rotating extruder screw and a shaping retainer plate terminating the casing at the outlet side, which is fixed to the casing and can be raised therefrom if an excessive overpressure occurs. So as to ensure rapid raising and a rapid release of the overpressure when a safety hazard occurs, the retainer plate is fixed to the casing by a mechanical or a gas pressure spring, whose spring tension is adjustable. It is also possible to provide a hydraulic pressure directed in opposition to the spring and by which the retainer plate can be raised in random manner from the casing.

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