B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/123
B28B 3/24 (2006.01) B28B 3/26 (2006.01) B28B 7/34 (2006.01)
Patent
CA 1312452
ABSTRACT Processes for making rigid ceramic bodies with one or more channels therein includes forming an outer tube of extrudable ceramic mix about an inner core of extrudable organic mix within the chamber of a piston type extrusion barrel composite, simultaneously extruding the outer tube and inner core through a tapered extrusion die having an extrusion outlet of smaller cross sectional size and area than the inner chamber of the extrusion barrel, cutting the extruded single core composite strand into shorter composite strands of equal length, filling the extrusion barrel with a plurality of the single core composite strands, simultaneously extruding the plurality of composite strands through the extrusion die and thereby forming a multiple core composite strand, cutting the multiple core composite strand into unfired green composite ceramic bodies and firing or alternatively prior to the cutting and firing steps again cutting the multiple core composite strand into equal lengths, refilling of the barrel therewith and extruding of a plurality of the multiple core composite strands through the extrusion die one or more times necessary to produce a ceramic body with the desired number of channels and then firing to simultaneoulsy burn out the organic cores and cure the ceramic body.
581427
Gowling Lafleur Henderson Llp
Norton Company
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