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Background The milk powder manufacturing industry is a growing industry. Prices keep on rising due to increased demand from growing economies in Asia. At some point in the production process any additives the customer wants can be added to the agitating milk powder. During this production process dust extraction is a very important issue. Challenge In the food processing industry, the filtration techniques and the hygiene requirements are often very hard to combine. The explosion protection requirements are often very high in the milk powder and sugar processing which make the installation very complex to maintain clean. The extracted substances are extremely hygroscopic which makes the filtration very hard and the filtration elements need to be replaced or cleaned often due to the dry medium that is being processed. Solution In collaboration with Miltech, we produced the ATEX wet scrubber for air volumes up to 20.000 m³/h. Based on a natural physical principle,

Tridelta Siperm has developed a two-layered porous material. Compared to our standard qualities, which show a homogeneous pore structure in the cross-section, the new material consists of two layers with different pore sizes. The sinter bridges which are formed between the two layers in the sintering process prevent that the layers loosen from each other when the material is cleaned with compressed air. In use the smoother side is facing the product in order to either achieve a maximum filter efficiency or – in the sphere of fluidization – to avoid the infiltration of the bulk into the fluidization unit. The product-averted side consists of a rougher, more permeable layer in order to hold the pressure drop as low as can.