Process for mixing and extruding ceramic materials

Abstract From the Canadian patent

of the Invention, 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°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°C.