Process for extrusion coating of a wire with a cellular thermoplastic resin material
US4181647A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1976 |
| Grant date | Jan 1, 1980 |
| Priority date | — |
| Expiry date | Oct 27, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus are provided for the extrusion of a thermoplastic material in modified form in which the thermoplastic material is introduced into the barrel of a screw extruder, and is heated and forced through the barrel: the material is passed through valve means which together with the temperature of the material is effective to produce a melt transition in the material at a predetermined point and to thoroughly mix the material; subsequently, the material is forced into a low pressure zone in the barrel where a modifying agent is introduced into the material; the resultant mass is forced out of the low pressure zone, and is passed through a mixing means effective to intensify the dispersion of the modifying agent in the mass, the mass is extruded and the extruded material collected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.