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Unloading Big Bags of Calcium Carbonate using Custom Designed Material Transfer System

Bulk Bag Unloading System with Screw ConveyorThis custom designed big bag unloader transfers Calcium Carbonate from bulk bags to downstream equipment using a screw conveyor. It was manufactured for a large U.S. plastics compounding manufacturer based in Texas. The system shown is designed to dispense and convey Calcium Carbonate, which has a bulk density of 30 to 80 pounds per cubic foot, at flow rates of 9,000 pounds per hour.

Three custom manufactured components comprise this big bag unloading system including a big bag unloader with vibratory agitation, a 20 cubic foot storage hopper, and a 12-foot long screw conveyor. Due to the difficulty in conveying Calcium Carbonate, the motor  horsepower was doubled and the shaft size on the screw conveyor was increased to guarantee optimum performance. Also, the preliminary product testing dictated the incorporation of a more aggressive vibratory style unloader, rather than the normal bag paddle agitation design.

Shown to the left of the system is a 2 ton hoist, powered trolley, monorail, and upper bag support frame, which mounts on top of the hopper and screw conveyor frame.

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