Plastic article or earthenware shaping or treating: apparatus – With upstream screen or perforated plate for straining,... – Plural screens or plates
Patent
1987-03-13
1988-09-20
Hoag, Willard
Plastic article or earthenware shaping or treating: apparatus
With upstream screen or perforated plate for straining,...
Plural screens or plates
425204, 425376R, 425382R, B29C 4712, B29C 4730
Patent
active
047721979
ABSTRACT:
An extrusion die has at least one distribution bore which communicates with a central bore which receives extruded material from an extruder. Each distribution bore extends perpendicularly with respect to the longitudinal central axis of the central bore and then terminates in a first chamber which has an substantially rectangular cross-section. Each first chamber receives the extruded material from its associated distribution bore and terminates in a counter-pressure distribution plate having a cross-section corresponding with that of the first chamber and having a plurality of bores uniformly distributed therein for forming extruded material from the first chamber into a plurality of strands which are received by a second chamber. Each second chamber has a substantially frustopyramidal profile wherein its cross-section tapers from a cross-section corresponding with that of the first chamber and counter-pressure distribution plate to a smaller substantially rectangular cross-section end for expanding and then for compressing and recombining the material of the strands. The end of each second chamber terminates in an extrusion slot which has a substantially rectangular cross-section corresponding with that of the end of the second chamber. Each extrusion slot terminates in an expansion control slot having a cross-section larger than that of the extrusion slot for expanding the material to its final form.
REFERENCES:
patent: 3191228 (1965-06-01), Schluter
patent: 3664779 (1972-05-01), Warre
patent: 3687589 (1972-08-01), Schrenk
patent: 4015926 (1977-04-01), Nehmey
patent: 4217083 (1980-08-01), Machuque
Hoag Willard
Nestec S. A.
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