Extrusion screw for thermoplastic matter
US5020915A · kind A · utility
14Cited by
9References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 11, 1989 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | May 11, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The extrusion screw for thermoplastic material comprises a helical thread, having a trapezoidal profile with a flat crest and inclined flanks, the pitch and the width or the root of which remains constant, while the inside diameter of the screw increases from the entry of the screw in the direction of the exit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.