Abstract

An experimental investigation was carried out in order to confirm the influence of the shape of the feed opening to an enclosed horizontal screw conveyor on its performance. While the shape of the feed opening is not critical when dealing with free-flowing materials it has a very strong effect on performance when fibrous materials are being fed into the screw. In order to avoid blockages, the inlet of the casing should form an acute angle with the flight, in order to reduce the sliding of the materials along the casing edge and to encourage the cutting of the materials between the moving flight and the stationary edge of the casing. The included angle is related to the helical angle of the flight and the angle of friction between the materials and the flight.

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