In modern industrial production, the filter cloth most commonly used in filter presses is artificially woven filter cloth. Such filter cloth has won wide use in the market because of its plasticity, recyclability, superior performance and flexibility. The woven filter cloth of the industrial box filter press is divided into materials according to the material: polyester filter cloth, polypropylene filter cloth, nylon filter cloth, vinylon filter cloth, because their performance is different, so they are not suitable for their working environment. same.
Polyester filter cloth
The biggest advantage of this is that it has good acid resistance and poor electrical conductivity. It is the most acid-resistant filter cloth material among the four. The maximum temperature of filtration can reach 130~150, elongation at break (%): 20-50, breaking strength (g/d): 438, softening point (°C): 238.240, melting point (°C): 255 260, specific gravity: 1.38. So I think it is the best performance of these four filter cloths.
Polypropylene filter cloth
The polypropylene filter cloth is woven from the fibers and wires of the polypropylene section. The biggest characteristic of the filter cloth is that the surface of the filter cloth is smooth, has few burrs, and has good air permeability. This is advantageous in that the filter cloth is separated from the filter cake.
The polypropylene filter cloth on the market now has a medium-sized 750A thick type: 750B (series) 750AB. Its maximum use temperature is 140~160°C, and the maximum melting point is 165~173°C. Elongation at break: 18~35%. The performance of acid and alkali resistance is moderate between the four, not bad or bad. In short, the performance of the polypropylene filter cloth is still flat.
Nylon filter cloth
The strength of nylon filter cloth is 4-5.3 Cndtex. The elongation is 18% to 45%, the maximum softening point is 180~235 (°C), and the melting point is 215~235 (°C). It has strong alkali resistance. The experiment showed that he was not immersed for 20 h in 10% NAOH solution.
Nylon filter cloth The strongest filter cloth among the four filter cloths, the most wear-resistant filter cloth is 10 times that of cotton fiber. Its biggest disadvantage is that the chemical properties are unstable, it is easy to release a trace amount of harmful substances, and the filter is subject to secondary pollution. Therefore, such a nylon filter cloth cannot be used in industries such as food processing and bio-pharmaceutics.
Velen filter cloth
The chemical name of the vinylon filter cloth is called polyvinyl alcohol. The advantage of the filter cloth of this material is that it is the most alkali-resistant among the four types. The filtration temperature should not exceed 60°, and it will deform and shrink at 100°. So it is not resistant to high temperatures. Other properties: the strength is only 3.52 - 5.72Cndtex. The elongation at break is 12% to 25%. The elasticity is poor, the fabric retains the shape, the wear resistance is good, and the durability is 1-2 times that of the pure cotton.
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