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November 1, 2006

1 Min Read
Mixing screw designed for non-shear-sensitive materials

With ?chaotic? mixing action, the Hurricane mixing screw was designed for non-shear-sensitive materials and is suited for extrusion, blowmolding, and injection-molding applications that require very aggressive mixing. The screw has reportedly worked well in polypropylene (PP) injection-molding applications in the lab and in the field, and the company expects the screw to be useful in blowmolding and extruding of polypropylene and polyethylene when high percentages of regrind are used. Achieving good color dispersion from pellet concentrate can be difficult in high-flow PP applications that require aggressive mixing, especially if the carrier resin has a much different viscosity than the PP.

The mixing section of the Hurricane screw has multiple closely spaced flights pitched to continue the forward flow of material as it exits the metering section. These forward-flow flights are interrupted by two or more reverse-flow grooves which start on opposite sides of the screw and then spiral forward to the end of the mixing section. Each of the forward-flow channels decreases in depth, compressing the material as it is conveyed forward. At the farthest end of the mixing section, the forward-flow channel reaches its shallowest point, which is also where it encounters the downstream end of the reverse-flow grooves. A portion of the material follows the path of reduced pressure and flows back upstream against the main flow of material. Along the way, the two streams interact, creating chaotic mixing action.

Glycon, Tecumseh, MI
(800) 255-9969; www.glycon.com

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