Rotary extruder
US4501543A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1983 |
| Grant date | Feb 26, 1985 |
| Priority date | — |
| Expiry date | Jan 13, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/365
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A rotary extruder contains pump rings positioned at opposite ends of the rotor shaft to collect excess thermoplastic melt forced outwardly to the housing ends and to redirect this excess melt to the feed section of the extruder. Redirection of the melt is accomplished by helical grooves located on the inside surfaces of the pump rings having an axial component directed toward the center of the extruder to provide a conduit for the melt. The melt is also directed by a series of angular grooves positioned circumferentially about the rotor opposite the pump rings which rotationally and axially propel the melt as the extruder rotor rotates. The rotor shaft is supported by bearings at opposite ends of the shaft which are offset from the axial center of the bearing housing. Repositioning of the bearing housings by rotation about their axes change the axial position of the rotor relative to the inner surface of the extruder housing thereby varying the size of the feed and compression sections of the rotary extruder to accommodate different types of thermoplastic material. A feed hopper for holding thermoplastic feed has its outlet positioned above a variable speed endless belt which disch…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.