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