What is bag filter in water treatment?

Bag filters are widely used in pharmaceutical, petrochemical, automobile manufacturing, paint and adhesive, food and beverage, electronic technology, water treatment, metal processing and other industries. In water treatment, our commonly used bag filters are roughly divided into:

① PET (polyester) fiber bag filter;

② Polypropylene (PP) fiber/PP microfiber bag filter;

③ Nylon single fiber bag filter

④ Unique high-temperature resistant polytetrafluoroethylene (PTFE) bag filter, etc.

▲ The nylon bag filter is made of high-strength nylon woven mesh. The advantages of nylon filter material are that it can be cleaned repeatedly and the cost is low, but as a surface filter mode, it is easy to block, so it is suitable for coarse filtration places with low precision.

▲ PP bag filter is made of polypropylene fiber filter cloth. PP filter material is a deep type filter material with excellent chemical resistance, high flow and low resistance, no pollution and long service life, so it is widely and economically used in industry.

▲ PE bag filter is made of polyester fiber filter cloth. The fibrous tissue is loose, thus increasing the capacity of impurities; This product is a compound closure mode, which can effectively remove solid and soft particles.

▲ PET bag filter is a high polymer of polyethylene terephthalate. It is milky white or light yellow, highly crystalline polymer with smooth and glossy surface. PET filter material is also a deep type bag filter, with excellent chemical resistance and solvent resistance. Especially for solvent-based fluids, it also has excellent corrosion resistance. PET and PP fibers are similar, but PET can withstand higher working temperature environment (160 ℃).

▲ PTFE bag filter, namely polytetrafluoroethylene bag filter, also known as Teflon, is one of the high-end varieties of bag filter materials. The bag filter can withstand acid and alkali erosion in the whole PH range under the continuous operating temperature of 240 ℃ and the instantaneous temperature of 260 ℃.