Profile: VibraScreener, Inc. specializes in offering screeners, separators, sieves, sifters and re-screening services. We provide rectangular screeners, vibratory sieves and gyratory sifters. The Bison Separator? is a high capacity industrial vibratory screen equipment separator highly popular for grading and separating processing materials into different sizes. This industrial shaker and sizing equipment is manufactured with a robust, high-mass screening machine casting making the Bison Separator? one of the most durable and reliable rectangular vibratory screen separator of its class.