Extruder screw tip and associated flow channel
US6887062B1 · kind B1 · utility
10Cited by
12References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1999 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Dec 1, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2021/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A screw nose for a rubber extruder screw has an upstream portion of increasing diameter providing working engagement of the rubber flowing from the screw with the extruder barrel and a downstream portion of decreasing diameter providing working engagement of the rubber with a converging tapered wall of a flow channel block for reducing the shrinkage and pressure drop at the discharge end of the screw and thereby prevent porosity and blisters in an extruded rubber component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.