Filter or tool-changing device for screw extruders
US4358262A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1981 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Nov 10, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a screw extrusion device used for extruding plastics materials, a filter or tool-carrier is disposed at the downstream or outlet end of the extruder, an annular pressure element bearing on the carrier so as to secure and seal the carrier in its operative position. The carrier is displaceable perpendicularly to the flowpath of the plastics material so as to permit facile changing of the filter element. The annular pressure element is acted upon by hydraulic fluid, the hydraulic circuit including an annular pressure chamber. The inner and outer walls of the chamber are formed, respectively, by concentric metal bellows. One end of each bellows is mounted on the pressure element and the other end thereof on a housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.