Corning Incorporated

Richard D Putt

Robert Bernard Lubberts

Eugene C Grover

John R Gangeme

Apparatus and a method for extruding a honeycomb, providing correction in bowing of the extruded honeycomb structure, employs a deflector device having a base plate including an aperture aligned in a direction parallel to the extrusion axis through which the plastic material is conveyed to the die, the aperture having a varying diameter; and, a slide plate movably mounted to the base plate, the deflector device positioned upstream of the extrusion die, the degree of bow reduction depending on the diameter or width of the aperture imparting a pressure drop gradient on the flow stream entering the die.

Apparatus for correcting bow in a honeycomb extrudate

An extrusion die assembly for making honeycomb structures of ceramics, glass, and other extrudable materials. The assembly is provided with an apertured, flow controlling forming plate placed against the input (upstream) surface of the extrusion die. The forming plate has a central opening through which the batch material to the input face of the die passes. A series of angularly spaced, flow controlling openings lies radially outwardly of the rim of this central opening. These forming plate openings are axially aligned with a shim reservoir downstream of the discharge slots of the die. This arrangement permits both the flow volume and rate of the batch material being extruded to the skin forming portions of the die assembly to be at least partially independently controlled relative to the flow volume to the main, radially central portion of the extrudate. By this construction, the formation of air checks in the shim reservoir and the formation of rippled skin on the extrudate is inhibited.

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Myrtle Beach, SC, United States of America

Richard D Putt