Grinding, storage and packing in grain production

Flour production involves grinding different grades of wheat by milling, and mixing the products of the various different process stages to achieve the desired style of flour. In the mill, the wheat moves between two large breaker rolls. They contain spiral grooves which crack open the grains of wheat and begin to separate the interior of the wheat from the outer layer of bran. The product of the breaker rolls passes through metal sieves to separate it into three categories. The finest material resembles a coarse flour and is known as ‘middlings’ or ‘farina’. Larger pieces of the interior are known as ‘semolina’. The third category consists of pieces of the interior which are still attached to the bran. The middlings move to the middlings purifier and the other materials move to another pair of breaker rolls. About four or five pairs of breaker rolls are needed to produce the necessary amount of middlings. The different qualities are then sorted into different silos before there are packed into cloth bags.

The inventory control of the various kinds of grain can be made by an OPTIWAVE 6500 FMCW radar level transmitter. OPTISWITCH 6500 level switches indicate the minimum and maximum height filling. OPTITEMP temperature transmitters are suitable to monitor the grain in these silos.