Wheat Milling Plant Manufacturers
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Browse Wheat Milling Plant Suppliers →Wheat milling plant — key equipment and process
A wheat flour milling plant produces white flour (and by-products — bran, germ, and wheatfeed) from tempered wheat grain through a series of controlled roller milling and sifting operations. The main sections of a wheat flour mill are: grain intake and storage; grain cleaning (pre-cleaner, aspirator, destoner, scourer, magnetic separator); tempering and conditioning (adding controlled amounts of water to the clean wheat and holding for 12–24 hours to toughen the bran and soften the endosperm for more efficient milling); first break (first roller mill — the break section opens the grain and begins to separate endosperm from bran); a series of break and reduction roller mill passages; plansifter (a multi-compartment flat sifter that classifies the milled material by particle size after each roller mill passage); purifiers (optional — aspirators over sieves that separate semolina from bran particles by air and screening); and flour mixing, fortification, and storage. The number of roller mill passages determines the throughput, extraction rate achievable, and quality of flour produced. A typical commercial flour mill for white bread flour uses 12–20 roller mill passages.
Frequently asked questions
What is flour fortification and is it mandatory?
Flour fortification adds vitamins and minerals to flour to address micronutrient deficiencies in populations that consume wheat flour as a staple food. Mandatory flour fortification programmes in many countries (including most of sub-Saharan Africa, many MENA countries, and some countries in Asia and Latin America) require the addition of iron, folic acid, and other B vitamins to roller-milled wheat flour at specified levels. A fortification feeder (a gravimetric or volumetric dosing unit) adds a pre-mixed micronutrient premix to the flour stream at the correct dose rate. Compliance with the national flour fortification standard is a legal requirement for mills supplying the commercial flour market in countries with mandatory fortification laws. Buyers commissioning a new flour mill in a country with mandatory fortification should confirm the required premix formulation, addition rate, and monitoring requirements with the relevant food regulatory authority.
What is a plansifter and why is it central to a flour mill?
A plansifter is a multi-compartment flat sieve machine that classifies ground material from the roller mills by particle size. It consists of a frame carrying a stack of sieve frames, each with a different mesh size, driven by an eccentric or gyratory motion. After each roller mill break or reduction passage, the ground material is fed to the plansifter, which separates it into multiple particle size fractions: coarse bran, fine bran, semolina and middlings of different grades, and flour. The separated fractions are then directed to the next appropriate roller mill passage or collected as flour streams. In a multi-passage flour mill, each plansifter handles the output of multiple roller mill passages in different compartments. The plansifter is the classification hub of the flour mill — its screen sizes, condition, and operational balance directly determine flour extraction rate and grade separation.
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