Extrusion apparatus and methods of extrusion
US5250249A · kind A · utility
3Cited by
10References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 3, 1992 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Sep 3, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2027/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Extrusion apparatus and a method of extruding in which an extrusion screw terminates close to a breaker plate so that an annular passage surrounding the screw extends to the breaker plate. The breaker plate has flow apertures arranged around an edge region of the plate for direct communication with the annular passage. The flow passage arrangement decreases in cross-sectional area in a downstream direction whereby plastics materials do not become static in certain regions. Plastics degradation, particularly for PVC, is therefore avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.