Dosing screw feeders are generally supplied for applications where accurate dispensing of powders is required. Such feeders are custom designed to suit the specific materials and throughput requirements. Feeders can be supplied with tubular or ‘U’ trough casings with removable top plates.
The majority of feeders are supplied with rigid casings and solid shafts with welded flights, however flexi-screws can be supplied where the unit comprises of a curved or flexible tubular casing with a flexible coreless flight helix. Such systems are useful where elevation is required but a straight feeder body is not achievable.
Single or twin helix agitators are incorporated for difficult materials to reduce bridging and promote a constant flow of material to the feeder flight.
For applications where higher batch sizes and varying throughputs are required specialist feeders can be supplied which include duplex flights of different diameters to increase throughput range whilst maintaining accuracy. For maximum throughput both flights are run simultaneously and for maximum accuracy just the smaller flight is run.