MAIZE MILLING PROCESS AND TERMS EXPLAINED

Like any other industry, maize milling has with its unique processes and terminology. Here’s a simple explanation of the processes that can take place during the production of maize meal and bran, depending on the set-up and size of the milling operation, and the type of maize meal required (community, super, special or very fine maize meal).

Milling flow infographic

01. STORAGE

The raw, unprocessed maize is stored in bags or silos, depending on the size of the operation.

Milling flow info graphic storage

02. CLEANING/ PRE-CLEANING OF RAW MAIZE

The raw maize is fed into the plant where it will first undergo the cleaning stage.

This step improves the quality of the final product. It’s vital that foreign material such as husks, straw and dust is removed using slotted screens or aspiration. As an extra precaution, a magnet is used to remove metal that could damage milling equipment. This process prolongs the lifespan of the mill and milling equipment.

Cleaning or pre-cleaning is done by hand with a simple table screen at community mills.

Milling flow info graphic cleaning

03. CONDITIONING

Conditioning is the addition of water to get the germ and bran moist for optimal removal/separation.

In community mills, this is done by hand or using Roff’s Posho mixer.

milling flow imfo graphic conditioning

04. DEGERMINATION – OPTIONAL

This process removes the germ from the endosperm to achieve a more refined maize meal and to prolong the end product’s shelf life. The by-product can be used as an ingredient in animal feed, further adding to profitability.


Some regions do not include the degermination step, but go straight to milling after conditioning, especially when producing special maize meal. 

Milling flow info graphic degermination

05. MILLING AND SIFTING

This step entails a combination of rollers and screens that break the product down to maize meal and removes the remaining bran before packaging.

milling and sifting

06. FORTIFICATION – OPTIONAL

The end product can be fortified with vitamins to meet the specific country’s food regulations during this step.

07. FINE MILLING – OPTIONAL

An additional milling step is included to reduce the granulation (texture) to a very fine flour.

Fine milling

08. PACKAGING

During the final step, the product is packaged as maize meal. It can either take place manually, or via a semi-automatic or automatic process.

Milling flow infographic PACKAGING

TRICKY TERMINOLOGY

Conditioning: Conditioning is the addition of water to get the germ and bran moist for optimal removal/separation.

Degermination: Removing the bran (chop or hominy chop) from the endosperm (maize kernel) to ensure a better end product quality.

Fortification: Adding vitamins to the end product to meet specific countries’ food regulations.

Roff offers a host of maize mills to cater for your every milling requirement, whether you’re just getting started, or are looking to upgrade your operation.

Contact our sales team today on +27 56 212 2697 or sales@roff.co.za

 

Maize milling

1 comment

worku Admassu

worku Admassu

Request for The type of maize (Corn)machine you have
Mobil 2510911281580/0947855731

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