Patent ID: 7914724

Claim:
A method of extruding a honeycomb article, comprising the steps of: providing an extrusion die including a die face provided with a plurality of central slots, a plurality of peripheral slots that are each defined by a corresponding pair of opposed slot walls of the die body, wherein the plurality of peripheral slots are respectively spaced from one another in an outward radial direction from a centerline of the extrusion die, the plurality of peripheral slots include at least one active outer peripheral slot spaced in the outward radial direction from at least one active inner peripheral slot, and a skin flow cavity formed adjacent to an edge of the die face, said skin flow cavity including a cavity surface in communication with the plurality of peripheral slots; and extruding batch material from a batch cavity through the central and peripheral slots to form the honeycomb article having a skin surrounding a central cellular structure, wherein a flow resistance of the batch material passing through the outer peripheral slot is less than a flow resistance of the batch material passing through the inner peripheral slot, wherein during extruding, a flow, Q, exiting any two active ones of the plurality of peripheral slots is made to be substantially equal.