The rotary sifter is a fundamental machine in flour production, used to sift and classify the milled product based on particle size. It separates fine flour, semolina, and bran, improving the uniformity of the final product and adapting it to specific usage requirements.

In addition to its separation function, the rotary sifter plays an important role in ensuring hygienic quality control within the process. During high-speed sifting, the generated vibrations and friction can contribute to the mechanical destruction of pest eggs that may be present in the flour, particularly those of common insects such as:

Tribolium confusum (confused flour beetle)

Sitophilus granarius (granary weevil)

Plodia interpunctella (Indian meal moth)

Ephestia kuehniella (Mediterranean flour moth)

The destruction of these eggs reduces the risk of subsequent larval development during product storage, helping to increase the flour's shelf life and preserve its hygienic quality.

The rotary sifter also facilitates the removal of any remaining impurities and enables precise particle size control, improving the quality and long-term stability of the final product.