Roller mills use cylindrical, opposing rollers to crush or grind material that is fed between them. They are used for medium to coarse grinding where control is key, and are capable of producing a wide range of particle sizes. Roller mills are suitable for grinding materials that are relatively soft and not too abrasive, such as grains, seeds, and certain types of food products. They are also useful for gentle, consistent applications like cracking grain. They are not used for extremely hard materials because they can knock the rollers out of tuning and cause loss of efficiency and constant adjustment.
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Roller mills consist of a series of rollers that are mounted on a frame, spinning on bearings. The material to be processed is fed into the roller mill, and as the rollers rotate, they crush or grind the material into smaller particles. If the particles are inconsistent or large and need to be made very small, a series of rollers are used to step down the material bit-by-bit.
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The grind size is set by adjusting the gap between the rollers. This is done by turning a screw or lever that moves the rollers closer together or farther apart. By adjusting the gap, the roller mill can produce a wider range of particle sizes, from fine to coarse feed. More expensive models can have their rollers adjusted remotely.
The consistency of grind is determined by the manufacturing quality and the number of rollers the material passes by. Higher quality mills will be sturdier, making the roller position more consistent, thus a more consistent grind. And more rollers means more passes of the product, which always reduces variability. Though there is an exchange between these two strategies, increased rollers will be more effective and more expensive.
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