Facts & Figures Book - KPI-JCI

HORIZONTAL SCREENS are utilized as a low heightaggressive action screening device. Horizontal screensare built with dual shaft (creating a straight line actionat approximately 45 degrees to the horizontal) or tripleshaft (creating an oval action with adjustable stroke angletypically between 30 and 60 degrees from horizontal). Aprimary feature of the horizontal screen is its aggressiveaction in applications where blinding or plugging of thescreen media openings can occur.FACTS ABOUT HORIZONTAL SCREENS:1. Flat screens operate at zero degrees.2. Provide a lower profile height for increased suitabilityon portable plants.3. Generates more “G” forces required to dislodge particlesthat might potentially blind incline screens.4. Produces an oval stroke pattern that can be adjustedto suit the application for increased flexibility throughmanipulating stroke length and timing angle.5. Triple shaft design distributes the load over a largerarea and utilizes smaller bearings that can run fasterand provide a longer operating life.6. Produces a consistent material travel speed along theentire length of the deck. The screen can also be configuredto enable a slower travel speed than inclinescreens for higher efficiency.7. The relationship of the trajectory to the screeningmedia is at a true right angle, where incline screensessentially reduce the amount of open area. Inclinescreen operators often compensate for this by installingcloth with slightly larger openings than the desiredtop size.BASED ON THIS DATA, A HORIZONTAL SCREENIS RECOMMENDED WHEN THE FOLLOWINGCONDITIONS EXIST:• The producer requires portability to move betweenvarious sites or a lower profile height is required.• The incoming feed gradation is inconsistent.• When screening efficiency/reduced carryover is a priority.• The screen is to be used in more than one application.• A slow, consistent material travel speed is required onany or all of the decks.• The material has a tendency to plug or blind the screencloth.143Screenin g