Spirex: New Screw with Toothed Mixing Section

A new variation of a Maddock Mixer is able to pulverize unmelted material like paint on bumper regrind, EMI shielding on electronic parts, or aluminum coatings on metalized film. The patent-pending screw, in which the three shear zones are scored crosswise, was designed by Robert Malloy of the Plastics Engineering Dept. of the University of Massachusetts, Lowell, and was built by Spirex Corp. It was tested on a 38-mm single-screw lab extruder, where it produced paint particles from 1.78 mm down to 0.09 mm. Particle size ranged from 2.64 mm to 0.15 mm in regrind processed using the same Maddock mixer without teeth.

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