wherein primary extrudate which exits through the primary slots is caused to buckle and form corrugated or cross {HEAD ~ directional cell walls} to thereby form {TAIL ~ channels} or cells which run generally at an angle to the axis of extrusion and to the secondary extrudate which exits through the straight cell slots forming straight cells 
to form
wherein primary extrudate which exits through the primary slots is caused to buckle and form corrugated or cross { HEAD ~ directional cell walls } to thereby form { TAIL ~ channels } or cells which run generally at an angle to the axis of extrusion and to the secondary extrudate which exits through the straight cell slots forming straight cells
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH