Facts & Figures Book - KPI-JCI

Screenin gFigure 1The variations in the stroke patterns of incline and horizontalscreens are illustrated in Figure 1.SCREENING REVELATIONSIn 2001, Johnson Crushers International, Inc. (KPI-JCI)performed a side-by-side test between flat and inclinescreens in an effort to better understand the benefits andlimitations of both designs. This data has led to the developmentof the new Combo screen design, which was alsotested and compared. Listed below is a general recap ofthe observations that were made:MULTI-SLOPE “COMBO” SCREENThe Combo ® screens utilize both inclined panels andhorizontal panels:1. Inclined panel sections increases material travel speed,thus producing thinner bed depths enabling fines to beintroduced to the horizontal bottom deck faster, whichincreases the bottom deck screening capacity, or bottomdeck factor used in the VSMA screen calculation.2. Increased travel speed produced by incline sectionsreduces potential for material spillover caused by volumetricsurges.3. Horizontal panels reduce travel speed and provideshigh screening efficiency and reduced carryover, similarto a flat screen.4. Only multi-slope design that utilizes a triple shaft assem-144