Filter Press Full Automatic Filter Press

1.2 Structure of press cloth materials According to the structure of press cloth materials, it can be divided into single filament, compound filament long fiber and short fiber. Monofilament is generally synthetic fiber drawn into 0. 16 ~ 0. 32 dtex single filament, the filter cloth woven by it has the advantages of smooth surface, uniform clearance, small specific resistance, quick water penetration, not easy to plug, easy cleaning and sludge stripping performance. However, the particle diameter is larger, the solid content of filtrate is higher and the recovery rate is lower. Complex silk is the warp/weft line, composed of a number of fibers woven into a silk. The composite filament fiber is woven into the press cloth with good tensile strength and better particle retention performance than the monofilament, but the stripping performance of the sludge is a little worse. Multifilament staple fiber is made of natural cotton wool fiber or synthetic staple fiber multi-twist, it has fluff fiber, showing good particle retention performance, good sealing, but the disadvantage is easy to plug pores, cleaning and sludge stripping performance is poor. 1.3 Press cloth weaving method According to the press cloth weaving method, the press cloth can also be divided into three types: plain weave, twill weave and satin weave. Plain filter cloth compact structure, small pores, so good particle retention, filtrate clarification, long service life, the price is cheaper. Disadvantages are larger than resistance, easy to plug, unloading slag performance is poor. Satin woven fabric is the largest pore, smaller than resistance, not easy to block, sludge stripping performance is good. But the particle retention ability is low, the filtrate is turbid and the recovery rate is low. The properties of twill filter cloth are between plain and satin, but it has strong anti-friction ability, high filtration speed and longest life, so it is widely used. Urban sewage treatment plant sludge production volume is large, the work intensity is high, the press cloth repeated extrusion often used, need to have a certain tensile strength, no expansion, good dimensional stability, high mechanical strength requirements for the press cloth; In the process of sludge conditioning and conditioning, PAM, iron salt, aluminum salt or lime and other agents are often needed to be added. The properties of the sludge are more complex. The sludge after conditioning is alkaline, and the filter cloth should be able to have a certain corrosion resistance. The sludge in urban sewage treatment plant is mainly composed of organic matter particles, which are fine and need filter cloth with relatively small pores. The filtrate after filtration should be clear, which is conducive to improving the recovery rate of sludge. The water permeability of the filter cloth is also good, the filtration rate is fast, and the moisture in the sludge can be discharged quickly, improving the working efficiency of the plate frame machine. Press cloth should not be blocked; After dewatering the filter cloth, the sludge stripping property is good, and the mud cake can be automatically stripped off after the filter plate of the plate frame machine is opened. The press cloth is easy to be washed and regenerated, extending the service cycle and reducing the use cost. Therefore, in the selection of plate and frame filter press cloth, to be able to meet the following requirements: high strength, corrosion resistance, filtrate clean, fast water penetration, not easy to plug, easy to peel, long life.