Method and apparatus for extruding a honeycomb structure

Details Method and apparatus for extruding a honeycomb structure Method and apparatus for extruding a honeycomb structure

1981-05-04

1982-12-21

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642098, 425197, 425461, 425466, B29F 304

Patent

active

043648886

ABSTRACT:
Elimination of shearing flow, having an inwardly radial flow and velocity gradient, of extrudable material entering a die for forming a honeycomb structure with a plurality of thin-walled cells, thereby avoiding irregularities in the extruded structure. The shearing flow, resulting from reducing cross-sectional area of a Bingham plastic material (e.g. a cordierite-forming, plastically moldable ceramic batch material) passing through a funnel section tapering inwardly from an extrusion barrel, is changed to plug flow by maintaining constant the reduced cross-sectional area through a straight-walled portion of an entrance cavity feeding the material to the die, which has passageways including a plurality of feed holes communicating with interconnected discharge slots sequentially in the extrusion detection for forming the honeycomb structure.

REFERENCES:
patent: 2524829 (1950-10-01), Perzel
patent: 2597638 (1952-05-01), Higbie
patent: 3382535 (1968-05-01), Ferrari
patent: 3888963 (1975-06-01), Orso et al.
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patent: 4178145 (1979-12-01), Hamamoto et al.
patent: 4278412 (1981-07-01), Ozaki et al.
patent: 4298328 (1981-11-01), Frost

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