The predominant use of roller mills is for the milling of grains to be consumed by the general public. While the use of roller mills is widespread, there are several different types of Roller Mills in Oregon that may be used people should familiarize themselves with. Here are the most commonly used mills and a description of how they function.
- Two-roller mills are the simplest type of mill that can be used. Grains are crushed between two rollers, which can be adjusted to accommodate the size of the grain needed. After the grains are crushed between the two rollers, they are sent on to their final destination. This method produces the coarsest of grains that can be used in the end product.
- Four-roller mills use two sets of rollers to process grains. The first set of rollers is usually wide-gapped to enable the husk to be separated from the seed without damaging the husk. The result is that large grits are left behind. From the cracked grain, flour is able to be sieved out, and the remaining grits and husks are sent through the second set of rollers to be crushed. There are three-roller mills that use one of the rollers twice, but these are not widely used in commercial milling operations.
- Six-Roller Mills in Oregon use three sets of rollers to perform their jobs effectively. The first rollers crush the kernels and separate them into three divisions. The flour produced is sent directly out of the mill. Any grits that do not have a husk are sent straight to the third set of rollers. Any grits that do still have husks, along with just empty husks, are directed to the second set of rollers to be re-ground and sent on to the third roller. There are also five-roller mills where one of the rollers is used twice.
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