Plastic article or earthenware shaping or treating: apparatus – With separate and distinct upstream agitating or kneading means – Within pressurizing chamber
Patent
1986-07-02
1988-01-19
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
With separate and distinct upstream agitating or kneading means
Within pressurizing chamber
2412601, 366 90, B29C 4738
Patent
active
047202548
ABSTRACT:
A screw extruder comprises a barrel (10) having a chamber (12) in which a screw (14) is mounted for rotation about an axis A. Sets of pins (22) project from the barrel into annular zones (24), (25) of the chamber (12), interrupting flights (26), (28), (30), (32) of the screw. The flights at either side of the, or each, annular zone (24) are displaced angularly relative to one another so that at either side of each annular zone (24) the flights are staggered. End portions of adjacent flights at either side of each annular zone (24) overlap. Material processed may have less temperature variation and improved homogeneity compared with material processed by previously known extruders.
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Chiesa Richard L.
Farrel Corporation
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