PROBLEMS OF DUST EXTRACTION PROCESS FROM METALLIZATION OF PRODUCTS
Metallization means the application of a layer of pre-melted metal to the surface of the metallized product. In other words, it is the hot spraying of the product. This technology is also referred to as lapping. Metallization is used as a surface protection of a product or its components where increased chemical corrosion resistance of the substrate material is required.
In metallization, the metallizing material - zinc or aluminum - is melted in a metallizing gun and accelerated against the surface by pressurized air. In metallization, however, not all of the material sticks to the surface to be treated, but only a part of it. During metallization, the remaining material is spread into the metallization box and needs to be very intensively sucked out and the air filtered. The air and the metal particles form an explosive mixture and the air extraction and filtration system must therefore be designed for the extraction of explosive dusts. The metal particles that enter the extraction system are already in the solid state again.
ATEX design of units with large filter area
The extraction for the metallization process is designed for intensive ventilation of the metallization area. The reason for this is the need to ensure that explosive dust is extracted so that there is no concentration of dust inside the box that would allow an explosion. The extraction and filtration system for metallization is designed with a thick-walled Skii extraction pipe, equipped with a safety flap to prevent the pressure wave from spreading into the metallization area. As a filtering device, we recommend the use of a textile filter unit in an anti-static design with a pressure-resistant cover up to a level of +40 kPa. The filter unit is equipped with overpressure diaphragms that rupture in the event of an explosion and release the overpressure into the safe area. The filter unit is always supplied equipped with automatic regeneration of the filter medium by means of pressurised air, so that the filter unit is capable of continuous operation. The entire air extraction and filtration system is always designed, manufactured and delivered according to the customer's requirements, the size of the workplace or the requirements of the metallization booth manufacturer.
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