Parkhurst & Oliff
Extruding die for forming finned ceramic honeycomb structures
 An extruding die for forming finned ceramic honeycomb structures includes extruding forming grooves for extruding a ceramic material therethrough and a plurality of material supply apertures for supplying the ceramic material into the extruding die. The extruding forming grooves open at a front surface of the extruding die and intersect with each other in the form of a mesh corresponding to a sectional configuration of a ceramic honeycomb structure. The material supply apertures open at a rear surface of the extruding die and communicate with the extruding forming grooves at intersecting zones thereof. The extruding die comprises fin forming grooves branched from the extruding forming grooves for forming fins, and the material supply apertures communicate with at least parts of the fin forming grooves. In extruding a ceramic material with this extruding die to form a ceramic honeycomb structure, it is easily formed uniform in density in its entirety including fins, thereby completely preventing the fins from falling off during extruding and preventing cracks from occurring in drying or firing. 
NGK Insulators, Ltd.
B F F
B28B F01N F01N
inventional additional inventional
Satoru Hiroshige
Inoue Mizuno