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• Filter cloth selection
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?♦  Selection and use of filter cloth
According to the physical and chemical properties of the separated materials, the choice and correct installation of appropriate filter cloth has a direct relationship with the separation effect, output, and vibration of the machine.
Filter cloth specifications are classified according to the filter mesh (air permeability). Determine according to the particle diameter of the separated material. Generally, in the selection of filter cloth, the bore diameter should be slightly larger than the diameter of the particles to be retained. In the initial stage, small particles pass the filter. When the larger particles retained form a cake layer, passage of particles can be eliminated, which improves the efficiency of filtration.
Single-wire double-layer composite filter cloth is recommended. The filter surface is treated by calendering to reduce the possibility of clogging and improve the regenerability of the filter cloth.
When installing the filter cloth, both sides of the seal lip should be embedded in the drum seal groove with the filter cloth seal ring supplied (for filter element of gravity discharge or scraper discharge centrifuge). Seal failure shall not exist, to prevent material leakage causing vibration.
The requirements of corrosion should also be considered in the separation of filter cloth material according to the chemical properties of the material to separate.

Performance	Polyester	Nylon	Polypropylene fiber	Vinylon
Acid resistance	Strong	Poor	Good	Non-acid resistant
Alkali resistance	Weak-alkali resistant	Good	Strong	Strong-alkali resistant
Corrosion resistance	Good	Poor	Poor	Good
Conductivity	Very poor	Relatively good	Good	Moderate
Recoverability	Very good	The recovery rate is above 90% at 10% elongation	Slightly better than the wheel	Poor
Abrasion resistance	Very good	Very good	Good	Relatively good
Heat resistance	130℃	120 ℃ slightly shrunk	90 ℃ slightly shrunk	100 ℃ slightly shrunk
Melting point	255-265℃	210-215℃	165-170℃	220℃

Before applied in food or pharmaceutical industry, rinse warm water, so as not to bring the dirt on the cloth.
Soldering by electric iron may prevent loose weft.
The sewing thread must be equipped with the same performance.
After the use of cloth, if the cloth holes are clogged so that the cloth is hardened, affecting the filtration rate, soak and wash the cloth with acetone, oxalic acid, toluene, caustic soda, alcohol and other solutions according to the properties, to soften the cloth, restore the hydrophobicity and breathability of the cloth, and improve the cloth usage.