Corning Incorporated

Floyd E Stumpff

Harry A Kragle

Joseph F Cocchetto

David Robertson Treacy, Jr

A honeycomb extrusion die and a method of making the die are disclosed, the die being made by bonding a die discharge section formed as a separate pin array to a separate die body incorporating an array of feed channels, the pin array comprising a plurality of pins attached to and extending outwardly from a body-compatible pin support which is removed after bonding the pins to the body. The pins may be formed of hard wear materials, and may have any of a variety of cross-sectional shapes adapted to improve extrusion uniformity as well as to form honeycomb cells of a variety of different cross-sectional shapes.

Bonded pin extrusion die and method

Method of making bonded pin extrusion die

A honeycomb extrusion die including a feed section having a plurality of feedholes for the input of an extrudable material, a discharge section including a discharge opening for discharging the extrudable material as a channeled honeycomb body, and a multilayer transition section disposed between the feed section and the discharge section for conveying and conditioning the extrudable material from the feed to the discharge sections, is disclosed. Also disclosed are methods for making and using the die.

Honeycomb extrusion die and methods

Novel apparatus is disclosed for forming a skin on an extruded honeycomb structure, wherein detrimental distortion of the peripheral cells is eliminated to thus provide a virtually distortion free honeycomb structure with an integral skin. Batch material is supplied for forming the central cellular structure, and a metered flow of skin-forming batch material is transitioned by the apparatus from a predominantly transverse flow to a predominantly longitudinal flow so as to minimize the distortion of web portions of the peripheral cells. In addition the apparatus subjects the skin-forming batch material to a first or primary flow path reduction in the form of flow depth and then, as it is knitting with peripheral web portions of the central cellular structure, the apparatus subjects such batch material to a second or secondary flow path reduction the form of reduced cross-sectional area, so as to effect a complete knitting thereof while still within the extrusion die. A unitary cellular structure with an integral skin is then discharged from the die with improved structural and strength characteristics.

Method and apparatus for forming a uniform skin on a cellular substrate

A method and apparatus for forming a skin on an extruded honeycomb structure, wherein detrimental distortion of the peripheral cells is eliminated to thus provide a virtually distortion free honeycomb structure with an integral skin. Batch material is supplied for forming the central cellular structure, and a metered flow of skin-forming batch material is transitioned from a predominantly transverse flow to a predominantly longitudinal flow so as to minimize the distortion of web portions of the peripheral cells. In addition, the skin-forming batch material is subjected to a first or primary flow path reduction in the form of flow depth and then, as it is knitting with peripheral web portions of the central cellular structure, it is subjected to a second or secondary flow path reduction in the form of reduced cross-sectional area, so as to effect a complete knitting thereof while still within the extrusion die. A unitary cellular structure with an integral skin is then discharged from the die with improved structural and strength characteristics.

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Elmira, NY, United States of America

Floyd E Stumpff