Screw extruder
US4367190A · kind A · utility
21Cited by
8References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 13, 1981 |
| Grant date | Jan 4, 1983 |
| Priority date | — |
| Expiry date | May 13, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/05
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An insulating coating of extruded polymer material is formed around a moving conductor wire; the extruder includes a decompression zone effective to arrest shear degradation of the polymer such that the melt index of the insulating polymer on the insulated wire is not more than 50% of the melt index of the solid, particulate polymer material before extrusion; the extruder includes valve means and intense mixing means which ensure that the polymer melts in a controlled manner whereby a uniform extrudate is formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.