In one particularly useful aspect, the invention relates to an extrusion die for extruding a honeycomb structure having a matrix of straight cell walls defining a plurality of straight cells running generally parallel to the axis of extrusion, and a matrix of cross directional or corrugated cell walls defining a plurality of {HEAD ~ cross directional cells} running generally perpendicular to {TAIL ~ the axis} of extrusion 
In one particularly useful aspect , the invention relates to an extrusion die for extruding a honeycomb structure having a matrix of straight cell walls defining a plurality of straight cells running generally parallel to the axis of extrusion , and a matrix of cross directional or corrugated cell walls defining a plurality of { HEAD ~ cross directional cells } running generally perpendicular to { TAIL ~ the axis } of extrusion
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