Method and apparatus is set forth for extruding honeycomb structures having cohesive cellular walls from an extrusion die. A baffle member is provided within the flow passageways of the die so as to provide impedance to longitudinal batch flow through certain of the discharge slots such that the impedance...http://www.google.co.uk/patents/US4468366?utm_source=gb-gplus-sharePatent US4468366 - Baffled laminated extrusion dies
