The filter element is the filter bag filter, filter structure divided into four parts cover, metal frame, pleated filter base and the base. The filter is designed to filter length folded into pleats, inclusive sticky synthetic tube; inner and outer tube with a metal frame supporting the upper and lower fixed with cover and base, a fixed roof bolts and washers. Inner and outer bag are metal mesh (or hard plastic mesh). Intermediate for the pleated filter media. As a result of intensive folding, it greatly increased filtration area. Great filtration area is the outstanding characteristic of the filter bag. Bag filter used both distinguished bag filter with filter cloth, but also different from the air filter paper. The gap between the fibers of the filter cloth is generally 12-60um, the gap is even greater between the paper fibers. Bag with a filter feature is the ultra-thin layer of submicron fibers adhered to the general media, on which the adhesive layer between the fibers are arranged very close, the gap 0.12-0.6um. Minimum mesh can most of submicron dust particles blocking the filter surface, so that it does not get to the bottom inside of the fiber . Thus, in the early days to the rapid formation of dust and good ventilation dust layer on the filter surface to keep it low resistance, high efficiency. Since the dust filter is not deep inside, it has a low resistance, easy cleaning features. BHA folding bag filter surface of the filter mechanism and viscous fiber filter press technology to form a plurality of fine gas flow passages clouds, high filtration efficiency, while maintaining a relatively low running resistance, a significant increase in treatment capacity. Filter material requirements of rigidity, making it a pleated bag filter without relying on the support material, a pleated bag filter bag and replace the constitutional frame and other components. Meanwhile, the filter material moisture resistance properties, high strength, easy cleaning, long service life, reduce maintenance workload dedusting equipment.