Special Flours / Protein Shifting

Grinding and Classifying with Higher Throughput Capacity

Special flours differ from normal flour, which consists solely of wheat, either due to their composition or their intended use. Powdery products with a special character are also included in the area of bakery products.

These can be either

  • Micronized flours,
  • Flours with particular finenesses with a steep particle size distribution,
  • Specially dried flours and/or powders with a reduction of the residual moisture in the product to below 5 %,
  • Flours or powders with an improved microbiological stability or
  • Flours with modified protein structures. 

Example of an Application: Protein Shifting in Wheat Flour

As well as dietary fiber, minerals and digestible carbohydrates, plant-based materials used for feeding humans or animals also contain proteins. The aim of the process of protein shifting is to gain a protein-rich fraction in which the amount of protein is considerably higher than in the original product by grinding and separating.

In this process the large difference between the size of the protein- and starch particles (starch: 30 µm to 40 µm, protein < 17 µm) is exploited, as well as the fact that starch can only be ground by means of dry impact grinding with a high energy input.

Using the NETZSCH classifier mill type CSM to fine-grind commercial wheat flour, protein- and starch particles in the flour are separated to a large degree. As the starch particles are difficult to grind due to their flexible structure, the protein particles are ground significantly more finely. By subsequent classifying with the NETZSCH Fine Classifier CFS or the NETZSCH High-Efficiency Fine Classifier CFS HD-S or the InlineStar, fractions with different protein- and starch contents can be obtained.


Solutions for Dry- and Wet Processing in Production and Laboratory Areas

Dry Grinding

Dry Grinding

Products & Solutions in the field of Dry Grinding
CSM Classifier Mill

The dynamic air classifier integrated into the grinding chamber housing of this fine impact mill manufactures fine particle sizes with a defined maximum particle size limitation. Internal classification of the coarse material results in a more stable and energy efficient process than a mill with an external classification circuit. Applicable for finenesses from 10 to 150 µm (d97).

Machine sizes with drive capacities from 1.5 - 250 kW and air volume of approx. 50 - 26,000 Nm³/h.

CFS Ultra-Fine Classifier

When a screening machine cannot be used, due to its separation limitations:

With our „standard“ ultra-fine classifier, CFS, fine powders can be cleanly classified. High performance classification and efficient results are valid for both coarse material and the separation of fines.

Available for finenesses from 10 to 250 µm (d97).

Machine sizes available for gas volume from approximately 50 to 16.000 Nm³/h.

CFS/HD-S High-efficiency Fine Classifier

The requirements of many product applications such as improved separation sharpness and finer cut points, are no problem for the CFS/HD-S range of High-efficiency Fine Classifiers.

Thanks to the maximum predispersion of the product to be classified, the targeted cut point and sharpness of cut can be optimized distinctly.

Available for finenesses from 2.5 to 60 µm (d97).

Machine sizes available for gas volume from approximately 50 to 16.000 Nm³/h.

InlineStar High-performance Fine Classifier

This newest fine classifier was conceived to combine with an upstream mill. The direct integration of the InlineStar classifier behind a mill creates a continuous grinding/classifying plant that reduces the number of required plant components.

Available for separation limits from 2.5 to 60 µm (d97).

Machine sizes available for gas volume from approximately 350 to 2.600 Nm³/h.