Processing Magazine

Products prone to screen blinding handled nicely

December 6, 2013

Kason ultrasonic sanitary screenerAn ultrasonic, “ultra-sanitary” vibrating-screen separator with gap-free screen frames, quick-access vertical clamps and anti-blinding separates bulk foods, pharmaceuticals and chemicals products prone to screen blinding and contamination, into three particle size fractions.

Combined with sanitary construction, washable exterior and clean-in-place sanitizing of internal product contact surfaces means this sanitary separator sifts powders down to 25 microns — 500 mesh — at high rates with no screen blinding or cross contamination, with shorter downtimes between production runs, says Millburn, N.J.-based Kason Corp.

Made of stainless steel with continuous large-radius weld seams, ground and polished to 240-grit, the screener complies with 3-A, BISSC and FDA sanitary standards as well as ATEX and CE electrical standards.

Its interlocking screen-frame flange configuration fully envelops the screen support ring, allowing the screen’s wire mesh to extend to the frame interior walls and eliminating the gap between the screen ring and frame wall, common to conventional screeners, where material would otherwise collect.

The gap-free design reduces the possibility of contamination due to bacteria growth and improves sanitizing efficiency. Clean-in-place allows sanitizing without opening the unit. The open base and stainless steel wash-down motor enclosure allow complete access. An Auto-Lube feature pressure-feeds food-grade lubricant to the motor bearings, flushing out any dead spots where lubricant might pool, and allowing six to 12 months between reservoir replacements.

The patented anti-blinding device allows sifting of powders at high rates with no screen blinding. Single or multiple transducers (for large diameter machines) transmit ultrasonic frequencies to the screen surface in continuous or pulse mode, automatically adjusting power to maintain constant frequency as screen loads vary. Tranducers operate with standard screens and are not fixed to the woven wire mesh, reducing re-screening costs significantly.