Patent ID: 6039908
Filing Date: 2000-03-21
Classification: B28B,B29C,B29L

Abstract:
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; andthereafter directing the feed stream with superimposed first and second pressure drop or flow velocity gradients through a honeycomb extrusion die.