Process for mixing and extruding ceramic materials
US4551295A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1984 |
| Grant date | Nov 5, 1985 |
| Priority date | — |
| Expiry date | Apr 26, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/14
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention is directed to the making of ceramic articles through extrusion utilizing a self-cleaning, intermeshing, co-rotating, twin screw extrusion apparatus. The invention is particularly directed to the extrusion of honeycomb structures wherein the batch consists of cordierite or cordierite-mullite compositions with water and a hydroxypropyl cellulose binder/plasticizer having a viscosity at 20.degree. C. in a 2% aqueous solution between 25,000-100,000 centipoises. Preferably, the hydroxypropyl cellulose will have a viscosity of at least 50,000 centipoises such as to permit a working temperature during operation of the extrusion apparatus of at least 40.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.