Counter-rotating twin screw extruder
US8079747B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 24, 2011 |
| Grant date | Dec 20, 2011 |
| Priority date | — |
| Expiry date | Mar 24, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/268
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A screw extruder having a body forming a chamber of two barrels housing two counter-rotating axis-parallel rotors, a supply port for the material to be mixed in the chamber at one end of the body, a discharge port for discharging the mixed material at the other end of the body, a conveying section with screws for feeding the material from the supply port downstream to a mixing section which comprises at least two mixing zones, each mixing zone having at least one forward-conveying wing and at least one backward-conveying wing downstream of the forward-conveying wing on each rotor characterized in that a throttle valve is provided in the chamber downstream of the mixing section, and downstream of the throttle valve a second conveying section with screws and a second mixing section are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.