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Intermediate Powders (eg instant coffee powder)
Often such a powder might be damaged if large diameter compressive auger overflights are used in the hopper section, so an auger with parallel flights would be selected. Furthermore, an intermediate powder might tend to dribble after the auger has stopped. In such cases, it is necessary to create a slight back pressure and retain the powder in the funnel by the addition of a "drip washer" to the bottom of the auger or crosswires/gauzes to the bottom of the funnel. The correct solution varies with each powder and tends to be more of a "black art" than a science.
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