Plastic article or earthenware shaping or treating: apparatus – With separate and distinct upstream agitating or kneading means – Within pressurizing chamber
Patent
1992-10-27
1994-04-19
Bushey, Charles S.
Plastic article or earthenware shaping or treating: apparatus
With separate and distinct upstream agitating or kneading means
Within pressurizing chamber
366 80, 366 90, 425209, 4253781, 4253824, B29C 4700
Patent
active
053040546
ABSTRACT:
A Transfermix cold feed extruder having a plasticizing section that includes a plurality of screw flights therein in a transfer zone that is formed over a common length of the screw and barrel of the extruder. In the transfer zone, a helical groove in the screw varies in cross section from a full area to a zero area, and a helical groove of opposite hand in the barrel correspondingly varies in cross section from a zero area to a full area. The extruder is provided with a set of flow deflectors in a cut in the screw positioned immediately upstream of the plasticizing section. By the coaction of the flow deflectors with the plurality of screw flights, an increase of throughput for difficult-to-extrude compounds, with an improvement in the quality of the extrudate, is obtained in a surprising manner.
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Bushey Charles S.
Frenkel C-D Aktiengesellschaft
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