Extrusion apparatus and systems
US5232712A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1991 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Jun 28, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/755
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Systems are disclosed for forming an extrudate. The systems include an extrusion head assembly having at least a first inner bore and a second outer bore, a coagulant solution supply and a polymeric casting solution supply. The coagulant supply provides coagulant to the inner bore of the extrusion head assembly, and the polymeric casting solution supply provides a casting solution to the outer bore. Using this system, the coagulant and polymeric solution are coextruded to form an extrudate having a desired configuration. The present invention further includes a rapid action valve controlling at least one of the coagulant or polymer supplies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.