filter press cloth for chamber filter press

Press filter cloth selection

1 Type of filter press filter cloth The filter cloth of the filter press is classified and selected according to the different material, material composition and compilation methods. 1.1 Press cloth material 1.1.1 Polypropylene fiber press cloth polypropylene fiber is made of propylene as raw material by polymerization, melt spinning fiber, the price is relatively low. Polypropylene fiber press cloth has good chemical corrosion resistance, good resistance to acid and alkali, high mechanical strength, wear resistance. The wet strength of polypropylene fiber is basically equal to the dry strength, and the strength of polypropylene fiber filter cloth basically remains unchanged during the filtration process after mud entry. The moisture absorption of polypropylene fiber filter cloth is very small, almost no moisture absorption, a large air strip under the moisture recovery rate is close to zero, but it has core suction, can pass through the capillary in the fabric to transfer water vapor, but does not have any absorption effect. The vertical surface of polypropylene fiber is flat, straight and light, and it is also convenient to peel off the sludge after the mud is compressed. However, polypropylene fiber filter cloth has poor light resistance, poor thermal stability and easy aging. 1.1.2 Polyester filter cloth polyester is a fiber made from refined terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG), which is a fiber forming polymer, polyethylene terephthalate (PET), which is produced by esterification or transesterification and polycondensation reaction. Polyester has high strength, good wear resistance, good light resistance, corrosion resistance, resistance to bleaching agents, oxidants, hydrocarbons, ketones, petroleum products and inorganic acids, resistance to dilute alkali, not afraid of mold, but hot alkali can make it decompose. Because polyester filter cloth is less hygroscopic, its wet strength and dry strength is basically the same. The elasticity is close to wool, and it can recover almost completely when it is extended by 5% ~ 6%. Wrinkle resistance is more than other fibers, that is, the fabric does not wrinkle, good dimensional stability.