Screw-type plastics extruder
US4171196A · kind A · utility
13Cited by
3References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1978 |
| Grant date | Oct 16, 1979 |
| Priority date | — |
| Expiry date | Oct 16, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved screw-type extruder intended to increase the output obtainable from a machine of certain dimensions while maintaining a satisfactory quality of the material extruded. This result is obtained by providing in the homogenization zone a thread crossed by a multitude of narrow passages, and in the feed zone means for overfeeding the plasticizing zone. These overfeeding means may, for example, consist in providing in this zone a cylinder grooved longitudinally or spirally or a double-screw section producing a forced pushing of the material toward the plasticizing zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.