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Flat filters

Due to their "two-dimensional" pores, flat filters act as strainer cores. All impurities larger than the dimensions of filter holes, sometimes also smaller particles, get captured on the filter inlet side, where a filter cake is formed. The depth filtration does not come into play here.

Metal gratings

Metal gratings can only be used for low-temperature alloys, mainly aluminium alloys. Since inclusions in aluminium alloys are in the nature of films, the efficiency of metal gratings is relatively good. A very favourable price is also an advantage. After solidification, however, the steel filter remains solidified in the gating system, with which it returns back into the melting furnace. This may lead to an undesirable increase in iron content in the melt.

Cloth filters

Cloth filters are woven from refractory textiles into shapes roughly similar to metal gratings. The filters differ in mesh, profile and thickness of individual strands. To improve the efficiency of filtering, the filter textile can be activated by impregnation with a special resin. Due to their low thermal capacity, it is possible to place many filters in one mould at different sites. This allows impurities that have entered the mould with molten metal to be captured on the first filter, and to remove other, tiny inclusions that have been formed due to the flow in the gating system. They can also be used as the aid for easy riser separation from the casting body itself.


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