Roller mill

For rolling mills that roll metal into various shapes, see rolling (metalworking).
An early 20th-century oil-seed roller-mill from the Olsztyn district, Poland
A late 19th century double roller mill displayed at Cook's Mill in Greenville, West Virginia in 2022
Closeup of Barnard's Roller Mill, New Hope Mills Complex, New York
Cutaway drawing of a centrifugal roller mill for mining applications, 1913

Roller mills are mills that use cylindrical rollers, either in opposing pairs or against flat plates, to crush or grind various materials, such as grain, ore, gravel, plastic, and others. Roller grain mills are an alternative to traditional millstone arrangements in gristmills. Roller mills for rock complement other types of mills, such as ball mills and hammermills, in such industries as the mining and processing of ore and construction aggregate; cement milling; and recycling.