Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1997-11-07
1999-08-03
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
26421123, 264349, 366 79, 366 81, 366 84, 366 85, 366 89, 366300, 366301, 366318, 366319, 366322, 366323, 366324, 425200, 425204, 425208, 425209, B29C 4760, B29C 4762, B29C 4766
Patent
active
059321598
ABSTRACT:
A screw extruder (10), including a barrel (18) having a bore (26) which defines an inner surface (24). At least one extruder screw (28) is positioned within the bore (26), each screw (28) further including a central shaft (34) and at least one screw flight (30). Each screw flight (30) further includes a front pushing face (36) and a rear face (38). The profile (40) of each front pushing face (36) acts with the inner surface (24) of the barrel (18) to form a progressively narrowing passage (46) through which material is forced into multiple regions of high elongational and shear stress (48) which act to break down agglomerates of material and thus dispersively mix the material.
Also presented is a screw extruder (100) having a single screw (28) which includes dispersion disks (102) which are rotationally offset from one another and whose design is not constrained by interaction with a second disk, which provides improved distributive and dispersive mixing.
Also presented is a method of extruding material using a screw extruder (10) having pushing face (36) profiles (40) which form progressively narrowing passages (46) in conjunction with the barrel (18) inner surfaces (24) to provide improved dispersive mixing.
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Guernsey Larry B.
Hughes Michael J.
Rauwendaal Extrusion Engineering, Inc.
Tentoni Leo B.
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