Material and apparatus for extruding a crosslinked polyolefin product
US4250132A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 1979 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | May 31, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/06
- 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.