YAMAMOTO CO., LTD.

Basic principle and types of Rice Milling Machine

Basic principle

The process from brown rice to milled rice or white rice are physical or chemical. In general physical processes are used. During rice milling using physical processes, the rice grains receive single or a combination of friction force, scraping effect, grinding effect, and impact force. There is a close relationship between the friction force and scraping effect as well as between grinding effect and impact force.

Rice milling machines using these physical procedures are divided into pressure type and velocity type.
Pressure mills use the friction force among the various factors used in milling with an accompanying scraping effect. The rice bran layer is peeled off the rice grain by these forces.
In general, a friction mill is of this type.
Velocity mills use the impact force applied to the rice grains when they collide with the grinding roll, as well as the abrasive effect of fine grinding stones on the surface of the roll to break and scrape off the surfaces of rice grains.
The rice bran layer is thus removed. In general, an abrasive mill is of this type.