Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1991-08-12
1992-12-15
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
26417712, 26421111, B29C 4730
Patent
active
051715031
ABSTRACT:
A method of extruding a honeycomb type structures, such as filters, by flow of extrudable material (e.g. ceramic material) through a die with feed holes having smooth and gradual transition of flow cross sectional area and shape to be congruent at end of holes forming junction with intersections of criss crossing discharge slots. 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 they 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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Peters Donald C.
Seely Richard L.
Corning Incorporated
Thurlow Jeffery
Wardell Richard N.
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