Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For extrusion or injection type shaping means
Patent
1989-06-27
1990-12-25
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For extrusion or injection type shaping means
26417712, 26417716, 425380, 425461, 425464, B29C 4712
Patent
active
049798898
ABSTRACT:
A rigid mini-monolith structure formed by extrusion from a die. Such structures are useful as catalyst supports for treating exhaust gases from automobile. The structure is in the shape of a right circular cylinder with a plurality of internal cells extending along the substrate and an opening on both ends. In order to provide maximum crushing strength of the structure, as well as permitting uniform intercell wall thickness at the downstream face of the extrusion die which forms the structure, the majority of the cells are formed in the transverse cross section of a truncated (circular) sector and have the property that they each possess the same hydraulic diameter, although not all are of the same transverse cross sectional shape. The invention also is defined by a novel extrusion die formed by a plurality of concentric, collared tubes provided with longitudinally running slots in the tubes and notches on the collars, the tubes being radially spaced from each other. The non-slotted portions of the tubes define the cells of the extruded structure.
REFERENCES:
patent: 3609808 (1971-10-01), Jacobi et al.
patent: 3837783 (1974-09-01), Bagley
patent: 3856448 (1974-12-01), Iijima et al.
patent: 4343604 (1982-08-01), Minjolle
patent: 4798526 (1989-01-01), Briggs et al.
Corning Incorporated
Greer, Jr. Thomas J.
Mackey James P.
Wardell Richard N.
Woo Jay H.
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