METHOD AND APPARATUS FOR DOSING AND MIXING

摘要

Particulate plastics resin is dispensed from hoppers to a weighing station. The combined weight of the dosed particulate material is subject to fluctuation and is thus recorded for each cycle of the apparatus whereupon it is passed to mixing apparatus. A proportional amount of liquid colourant material is dosed by volume and dispensed directly into the mixing apparatus with the weighed particulate material. The colourant material is then mixed with the particulate material in the mixing apparatus and passes to an outlet for dispensing to forming apparatus. The operation is controlled by an electronic controller so that accurate dosing is performed. Metered dosing of the colourant volumetrically and directly into the mixing apparatus solves accuracy problems associated with prior art methods.