Mixing screw for extrusion and injection molding
US4925313A · kind A · utility
15Cited by
16References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Apr 6, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A plasticating screw having a mixing section comprised of two flow channels separated by barrier flights having axially spaced undercut sections and areas of compression and decompression in each channel. Inhomogeneities in the material being plasticated are distributed in both the forward and back directions by means of pressure driven cross-flows caused when the material encounters a section of a channel having a decreasing depth adjacent an undercut section of the barrier flight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.