Method for honeycomb extrusion using a corrected flow gradient
AssigneeCorning Incorporated
InventorsThomas W. Brew, Harry A. Kragle
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Abstract
Apparatus and a method for extruding a honeycomb, providing reductions in curvature or bowing of the extruded honeycomb structure, employs a bow deflector positioned upstream of the extrusion die, the bow deflector comprising adjoining, independently rotatable, first and second aperture plates of tapering thickness, the degree of bow reduction depending on the relative rotational position of the aperture plates and the resulting magnitude of the pressure/flow velocity gradient imparted by the plates on the flow stream entering the die.
Claims3
A method for forming a honeycomb structure from an extrudable material which comprises:
- directing a feed stream of the material along an extrusion path through a first plurality of apertures in a first aperture plate disposed across the feed stream, the first apertures having varying flow resistance across the first aperture plate to impart a first flow velocity or pressure drop gradient across the width of the feed stream;
- thereafter directing the feed stream through a second plurality of apertures in a second aperture plate, the second apertures having varying flow resistance across the second aperture plate to superimpose a second pressure drop or flow velocity gradient on the first pressure drop or flow velocity gradient across the width of the flow stream;
- and
- thereafter directing the feed stream with superimposed first and second pressure drop or flow velocity gradients through a honeycomb extrusion die.
Dependencies are inferred from the claim text.