Wheat Cleaning
The wheat cleaning process, also known as precleaning, involves separating large impurities like straw,
hemp rope, and wood chips from the wheat before it goes into a dirty bin. The process typically uses a precleaner
that combines screening and fanning.
Conditioning
Water is added to the grains to soften the bran, making it easier for the break rolling machine to cut into the grain
and reach the flour-containing endosperm. The conditioning process also adjusts the temperature and moisture content,
making the grains more suitable for milling and improving the quality of the flour.
Machinery
Purification
In a wheat mill, purification is achieved when fine bran and germ are separated from endosperm
particles to increase the purity of coarse endosperm (farina or semolina). In durum semolina production,
purifiers are essential to finished product quality and work by removing fine bran and compound particles
(large endosperm with attached bran) from the finished semolina.
In a flour mill, the objective of the purification system is to separate clean farina, or coarse endosperm,
from fine bran or compound particles to feed the primary reduction rolls. This purification step allows the
miller to maximize extraction of low ash, bright color flour. The purifier is the most common component of
a mill purification system.
Production