Extrusion die for forming thin-walled honeycomb structures

Details Extrusion die for forming thin-walled honeycomb structures Extrusion die for forming thin-walled honeycomb structures

1988-08-29

1991-11-19

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Single inlet, plural shaping orifices

26417712, 425461, B29C 4730

Patent

active

050662155

ABSTRACT:
An extrusion die for forming honeycomb type structures, such as filters. In a typical prior art extrusion die, the feed holes are circular in cross section throughout their length and feed into respective intersecting discharge slot portions. There is an abrupt change in cross section area and shape, from circular to cross shaped, at the entrance to the discharge slots. This construction results in flow inhibiting land portions at the entrance to the discharge slot portions. Such a construction causes bending forces or moments on these flow obstructing entrance portions of the discharge slots and also subjects them to increased abrasive wear whenever the material being extruded contains ceramic or other hard particles. By this invention, the feed holes are uniformly tapered from an annular or polygonal transverse cross section at their input ends to a (conventional) cross shape at their outlet ends where by feed the discharge slots. Thus, the bending problems are eliminated and the wear problem is substantially reduced and die life is considerably extended.

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