Precision filtration is a kind of filtration between sand filtration (coarse filtration) and ultrafiltration. The filter pore size is generally in the range of 0.5~120μm. The filter material of the same type can be divided into different specifications according to the appearance size. There are two types of wire wound filter elements (also known as honeycomb filter elements): one is polypropylene fiber---polypropylene frame filter element, with a temperature of 60℃; the other is absorbent cotton fiber---stainless steel frame filter element, with a temperature of 120°C.
Melt-blown filter element is a filter material made of polypropylene as a raw material and a melt-blown process, with a working temperature of 60°C. Filtration can remove suspended solids, some colloidal substances and small particles in the water. The filter element materials mainly include sintered filter tube, melt blown fiber filter element and honeycomb filter element.
Sintered tube is formed by sintering powder materials, and the filter tube materials are ceramic, glass sand, plastic and so on. Melt-blown fiber filter elements generally use polypropylene as raw material, which is made by heating and melting, spraying, traction, and receiving molding. PP filter elements using polypropylene as raw material are more commonly used. The honeycomb filter element is made of textile fiber roving wound on the porous skeleton, and the honeycomb filter element is more commonly used with polypropylene thread.