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Infeed component mixers fall into two categories, either volumetric or gravimetric. Volumetric feeders are not used when accuracy is required. Volumetric blenders feed using screws, belts, rotary valves or vibratory feeds based on a calibrated duration or cycle. This feeding can only be used when dealing with a material that has a uniform material flow. Gravimetric blenders actually weigh the product being fed and when the accurate weight is achieved release the correct amount of product to be blended with the other components. Component blenders that combine two, three, four, five or even six components are common in plastics injection or extrusion processing.
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