Cascade type dynamic mixer for extrusion of plastic
AssigneeBeloit Corporation
InventorNickolas N. Sokolow
Life of this patent
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Abstract
A cascade type dynamic mixer for extrusion of plastic comprises extruder screw means to advance a thermoplastic resin material through a hollow barrel, and having a mixing section along a length thereof provided with a plurality of encircling barrier rings in axially spaced relation therealong. The rings have localized high shear cascade areas which are graduated to pass progressively smaller size particles along the mixing section. On each ring, undulations provide alternating plastic advancing and reversing flight lengths, the shear areas being on the reversing flight lengths which are shallower than the plastic advancing flight lengths and progressively higher in each ring downstream along the mixing section.
Claims10
A cascade type dynamic mixer comprising a mixing section along a length of screw means adapted to advance thermoplastic resin material through a hollow barrel toward an outlet, having the improvement comprising:
- said section provided with a plurality of encircling barrier rings in axially spaced relation therealon;
- and
- each of said rings having a circumference which in part will closely approach an inner wall of the barrel and which circumference is in part shallower to provide substantially uniform depth narrow gap relative to the barrel inner wall, the shallower parts of the ring circumferences providing respective localized high shear cascade areas which are of progressively shallower depth in the successive rings downstream along the mixing section whereby to pass particles of progressively smaller size in the direction of plastic advance along said mixing section.
Dependencies are inferred from the claim text.