Hammer mills

Sigma hammer mills are characterised by particularly high energy efficiency - thanks to several specifically optimised design features:
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Optimised aspiration: a precisely coordinated air flow ensures that the material remains in the grinding chamber for a short time. This reduces wear and lowers energy consumption.
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‍Customised screen configuration: A large selection of screens enables the mill to be precisely matched to the respective product and the requirements of the process, which further increases efficiency.
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‍Sophisticated rotor design: The rotor has been specially developed to maximise the size reduction effect while minimising energy consumption.
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‍Innovative basic design: The well thought-out design of the grinders significantly shortens maintenance times and thus reduces downtimes and operating costs.

Hammer mills can be integrated into a production process in two ways:

Integration into a pneumatic vacuum conveying system: Here, the mill is integrated directly into an existing conveyor line so that the ground material is sucked into the mill by vacuum and transported onwards after grinding. This variant is particularly energy-efficient and reduces dust emissions, as the entire system operates in a closed system.

As a stand-alone machine with mechanical product feed and discharge: In this case, the material is fed in via a dosing screw with rotary valve, for example, while the ground product is transported onwards without pressure via a discharge screw with rotary valve or downpipes. With this variant, aspiration of the mill is always required. The extracted air can either be fed back into an existing filter system or cleaned by a top filter mounted directly on the grinder.

The choice of suitable integration depends on the individual requirements of the process, the material properties and the operating conditions.

Yes, the particle size distribution can be specifically adjusted. This is done by adjusting the speed, the correct design of the grinding chamber and the optimum control of the vacuum. A particularly decisive influencing factor is the choice of the right screen geometry. Here, our customers benefit from our many years of experience and our in-depth expertise.

Hammer mills are extremely versatile and can process a wide range of dry and wet bulk materials, including
Food & animal feed: grain, corn, soybeans, spices, flour, protein concentrates
Biomass & wood: wood chips, sawdust, bark residues, strawRecycling materials: plastic granulates, rubber, waste wood, paper, cardboard
Mineral raw materials: limestone, gypsum, fertilisers, clay, salts
The selection of the right hammer mill as well as the appropriate screens, hammers and process parameters depend on factors such as hardness, moisture, particle size and the desired final fineness of the material.