Plastics extruder
US4491418A · kind A · utility
2Cited by
5References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1982 |
| Grant date | Jan 1, 1985 |
| Priority date | — |
| Expiry date | Nov 9, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The hopper of a screw communicates with a feed chamber situated upstream from the extruder cylinder. The substantially rectangular feed chamber is large enough so that the behavior of a mass of plastic material in its initial state, i.e., in the form of powder or pellets, is affected neither by the side-walls nor by the upper wall nor by the removable bottom of the chamber. Thus, in the case of pellets, the distance between any of those walls and the apex of the screw thread is appreciably greater than the average diameter of the pellets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.