Device and method of correcting extrudate bow

A method for forming a honeycomb structure, comprising:

• directing a feed stream of batch material along an extrusion path through a bow deflector device comprising a base comprising an aperture of a first constant area to pass the feed stream of batch material therethrough, and a bow plate movably mounted to a downstream or upstream side of the base, the bow plate comprising an opening of a second constant area less than the first constant area to pass the feed stream of batch material therethrough;
• moving the bow plate relative to both the extrusion die and to the base to a position at which the opening of the bow plate is axially offset from a center of the aperture of the base, wherein by passing through the bow deflector device a unique flow velocity is superimposed on the feed stream of batch material, as determined by a diameter of the opening, and the position of the opening;
• and,
• directing the feed stream of batch material with the superimposed flow velocity through a honeycomb extrusion die, wherein the position can be selected such that the superimposed flow velocity corrects bow in, any direction, for a honeycomb extrudate extruded from the extrusion die.