Hardgrove, Ralph M. Stock Equipment Company, Cleveland, Ohio.
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A series of rolls operating at different speeds. Roll mills are used to grind paint or to mill flour. In paint grinding, a paste is fed between two low-speed rolls running toward each other at different speeds. Because the next roll in the mill is turning faster, it develops shear in the paste and draws the paste through the mill. The film is scraped from the last high-speed roll. For grinding flour, rolls are operated in pairs, rolls in each pair running toward each other at different speeds. Grooved rolls crush the grain; smooth rolls mill the flour to the desired fineness. The term roller mill is applied to a ring-roll mill. See also: Grinding mill
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