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Wheat Milling Process – From Grain to Flour

By PMG Engineering · 8 Dec 2021

Wheat is among the most widely consumed cereal grains globally and forms a staple part of diets across India and the world. It originates from the Triticum family, with bread wheat (common wheat) being the primary species used in commercial food processing plants. Other wheat varieties include durum, spelt, emmer, einkorn, and Khorasan wheat.

Common Wheat Products in Food Industry

Wheat is the key ingredient in:

White and whole-wheat flour
Pasta and noodles
Semolina and couscous
Bulgur wheat and cracked wheat

Wheat's widespread usage in food manufacturing stems from its versatility, availability, and nutritional value—particularly in whole grain form, which offers antioxidants, fiber, vitamins, and minerals.

Following are the steps involved in wheat milling process-

1. Grain Cleaning

Vibrating Screens remove straw, stones, and coarse impurities.
Aspirators lift off lighter dust and debris using airflow.

2. Size Separation

Disc Separator classifies kernels by size.
Scourer removes kernel hairs and polishes the grain.

3. Magnetic Separation

Magnetic separators eliminate iron particles and ferrous contamination.

4. Washing and Destoning

Washer Stoner separates clean wheat from stones and floating debris in a water bath

5.Tempering

Adds moisture to aid bran separation
Key factors: moisture %, soaking time, and temperature
Custom settings for soft, medium, and hard wheat

6. Entoleter Treatment

High-speed impact eliminates unfit or unsound kernels

7. Grinding and Sifting

First Break Rollers crush wheat into coarse granules
Sifters separate flour, bran, and granular particles

8. Purification

Air classifiers and screens remove bran and grade the endosperm
Regrinding with corrugated rollers refines middlings to pure flour

Conclusion

Wheat milling is a foundational process in the food processing industry, converting raw grains into refined flour for widespread culinary and industrial applications. By incorporating advanced cleaning, separation, tempering, and grinding technologies, modern food manufacturing consultants help ensure consistent product quality, safety, and operational efficiency. Whether you're designing a new food processing plant or upgrading existing milling lines, integrating optimized wheat milling processes is essential for delivering superior output, meeting compliance standards, and sustaining profitability in the competitive food industry. As a food industry consultant, PMG Engineering offers end-to-end expertise in designing high-performance milling facilities tailored to your business needs.

Reference

Slide 1 (iaom-mea.com)

flour | Production, Types, & Facts | Britannica

Wheat Milling (cerealsdb.uk.net)

wheat milling process - Google Search

https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/USDA_wheat.jpg/220px-USDA_wheat.jpg

Frequently asked

What are the main stages in a commercial wheat milling line?

A wheat milling line moves through eight stages: grain cleaning with vibrating screens and aspirators, size separation using a disc separator and scourer, magnetic separation, washing and destoning in a washer stoner, tempering to add moisture, entoleter treatment, grinding and sifting through first break rollers and sifters, and finally purification with air classifiers, screens and corrugated regrinding rollers.

Why is tempering needed before grinding wheat, and what parameters do we control?

Tempering adds moisture to the wheat so that bran separates cleanly from the endosperm during grinding. The key factors controlled are moisture percentage, soaking time and temperature. Settings must be customised for soft, medium and hard wheat, since each variety behaves differently, making tempering one of the most variety-sensitive steps in the wheat milling process.

How does a wheat mill remove foreign matter and metal contamination?

Wheat cleaning uses several complementary devices. Vibrating screens remove straw, stones and coarse impurities, while aspirators lift off lighter dust and debris with airflow. Magnetic separators eliminate iron particles and ferrous contamination. A washer stoner then separates clean wheat from stones and floating debris in a water bath, and a scourer removes kernel hairs and polishes the grain.

What does the entoleter do in a flour mill?

The entoleter applies high-speed impact to the wheat stream to eliminate unfit or unsound kernels before they reach the grinding section. Positioned after tempering in the wheat milling sequence, it protects downstream roller and sifting performance by removing weak or damaged grains that would otherwise degrade flour quality.

How is flour separated from bran during grinding?

First break rollers crush the tempered wheat into coarse granules, and sifters then separate flour, bran and granular particles. In the purification stage, air classifiers and screens remove remaining bran and grade the endosperm, while regrinding with corrugated rollers refines the middlings into pure flour.

Which wheat type and products should a new milling plant be designed around?

Bread wheat, or common wheat, from the Triticum family is the primary species used in commercial food processing plants, with durum, spelt, emmer, einkorn and Khorasan as other varieties. Milling output feeds white and whole-wheat flour, pasta and noodles, semolina and couscous, and bulgur or cracked wheat, so product mix should guide line configuration.

CITE THIS

PMG Engineering. (2021). Wheat Milling Process – From Grain to Flour. PMG Engineering. https://pmg.engineering/Article/115/wheat-milling-process-from-grain-to-flour/

https://pmg.engineering/Article/115/wheat-milling-process-from-grain-to-flour/