Posted by ROFF MILLING on 17 Jul 2019 10:43:08 AM



Through extensive feedback from clients and the industry – we’ve realised that the debate surrounding hammer mills versus roller mills will always be an ongoing one. However, the end product and it’s intended purpose should be the determining factor when deciding between the two.

ROFF Industries manufactures and supply both hammer and roller mills of the highest quality to various industries such as animal feed production, breweries and even tea producers. We do, however, refer to our roller mills as crushers and will do so throughout the following articles.



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Crushers consist of two grooved (flooted) cylinders that rotate towards each other. The grain is fed into the crusher from above and milled when passed through the gap between the two cylinders. The space between the two cylinders determine the size of the milled product and are adjustable by the operator, thus making the crusher very adaptable to product size. The ratio between the cylinders and grooves on the crusher can be determined during the design process to meet the product requirements. When milling with a crusher, the grain is uniform. If, for example, the desired outcome is less than 2000 microns, setting up the mill correctly, a low percentage of product will be below 500 microns, unlike the product produced by a hammer mill. Crushers are also energy efficient, almost dust free, and even noise levels are generally very acceptable.

Charl Marais, MD of ROFF says that some feed experts have the perception that crushers should only be used in feed milling to produce product smaller than 2000 microns.

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This perception, however, is incorrect according to Marais: “Start with a course grooved crusher and pass the product immediately after that through a second and finer set of crushers. A product of less than 1000 micron is possible with all the advantages of a crusher such as low capital expenditure for the process, energy efficiency, low maintenance, adjustability on the final product and low dust levels.”

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ROFF’s crushers are the ideal machine for cracking and crushing hard grains into variable grit sizes. The cylinders are adjustable so farmers or millers can have better control over the size of the grit produced. They’re also durable, and maintenance on crushers generally requires the cylinders to be removed and regrooved when blunt. The crusher is compact and easy to operate, which makes it ideal for use in stock feed plants and dairies, piggeries, feedlots and micro-breweries. ROFF supplies two standard roller mills, the small ROFF 150 Crusher, capable of 900kg/h and the larger 419 Crusher that can produce 3750kg/h. Also, ROFF can build a double high 419 Crusher, ideal for feed experts that require a finer product.

To learn more about ROFF’s range of crushers please contact us 
at or call +27 56 212 2697