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Material dosing unitsare used for adding a set amount of a single additive (a fixed percentage of colour masterbatch for example) to a base raw material. Units are typically located between the main material in-feed hopper of a machine and the machines throat. Cheaper volumetric units use a small auger type screw that runs for a set amount of time at a constant speed. More accurate gravimetric units work by weighing the additive.
Gravimetric Blenders can be specified to weigh and also mix a number of additives into the primary raw material. These units are typically machine mounted and have a number of hoppers, one for each additive and one for the primary material.