KWS Manufacturing Company Ltd.

Mass Flow Screw Feeders

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KWS Mass Flow Screw Feeders are the most efficient method to unload bulk materials from a large bin, silo or hopper. The term `mass flow` describes a material flow pattern in which all material in a bin is drawn down at the same rate, regardless if the material is against the sidewall or in the center. The alternative is commonly referred to as `funnel flow`. In a funnel flow situation only the material in one portion of the bin is drawn down.

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Funnel flow can leave large amounts of stagnant material in the bin and could lead to ruined product and possible safety hazards if the funnel collapses.

While mechanically simple in principle, the behavior of bulk materials during the draw down process can be complex. In order to create mass flow, both the bin and screw feeder must be designed properly.

In order to properly design for mass flow, material must be drawn down evenly along the entire length of the inlet opening of the screw feeder. Each pitch of the screw must have a higher volumetric rate than the preceding pitch. (See Image 3)

KWS Mass Flow Screw Feeders use a combination of varying inside diameter and pitch in order to ensure a consistent flow along the entire length of the inlet.