Twin screw extruder barrel with an easily removable seamless insert having a wear and corrosion resistant lining
US5816699A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1997 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Jun 13, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extruder barrel for twin screw extruders. The barrel body has a removable insert firmly seated in an insert receiving opening extending centrally and longitudinally therethrough. The insert has two circular bores with parallel axes extending centrally and longitudinally therethrough, the bores being in communication along a common chord. The walls of the bores have a wear and corrosion resistant layer that is a powder metallurgical material that is preferably applied by hot isotactic pressing. The preferred powder metallurgical material forming the wear resistant layer is a composition containing at least 50% by weight tungsten carbide with the remainder being nickel. The outer surface of the insert has a thin layer of a heat conductive, malleable material, such as copper, adhered thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.