Riffle screens are designed to double the screening area in the same footprint of the corresponding single surface screen machine. It does this through a special feed end that evenly divides the flow of material between the upper deck and the lower deck. An internal hopper keeps the two screens completely separate, until it reaches the discharge. At the discharge, the two product discharges combine and the two fines discharges combine. See illustration below.
J&H provides a full range of sizes from 4′ (101.6 mm) wide x 5′ (127.0 mm) long up to 7′ (177.8 mm) x 25′ (635.0 mm) long, designed in 5′ (127.0 mm) length increments. This provides 40 ft² (3.716m²) to 350 ft² (32.516m²) of screening surface. More importantly, the high frequency vibration generated by our J&H Vibrator Drive motors and the unique design of the J&H Tuned Suspension and OPTIMIZER Tensioning system actually make better use of the full area of the wire cloth. This gives the highest screening efficiency for typical high capacity industrial processing plants. The J&H Riffle screen is fabricated with integral internal and external fines hoppers that combine the material flow from the upper and lower screens. This hopper also has a dust collector flange located optimally underneath the lower deck wire cloth to maximize screening efficiency. Use a J&H Speed Clean to reduce product blinding on the wire cloth panels.
Large, removable side doors provide access to the internal hopper, drive connections, and the lower screen deck. Fold back rubber covers provide access to the upper deck wire cloth deck. A J&H Support Structure with raised feed end platform is used to provide access to the J&H Screen Feeder as well as the tensioning buffers on both sides of the screen machine.