Pleated bag directly replaces the existing round (elliptic) filter bag without structural modification of the main equipment, according to the system design and needs, generally increase the filtration area by 50-150%, significantly reduce the differential pressure of the system to improve the overall performance of the system and the life of the bag, significantly reduce the frequency or extend the interval of cleaning. Compared with ordinary bag, the efficiency of pulse soot cleaning (the same filter material) is significantly improved due to its special structure, the effective distance between bags is increased, the rising speed of airflow between bags is decreased, which greatly optimises the effect of on-line soot cleaning, and the special design of bag/ keel greatly reduces fatigue damage and intermittent discharge caused by pulse blowing, and there is no transverse support ring for the keel and the effective contact area is large, which can avoid direct impacts to the bag completely. Direct impact on the bag is completely avoided, the length of the bag can be shortened while increasing the filtration area if required. Optimisation of the system's operation results in a significant reduction in the compressed air consumption and the load on the compressor and the pulse valve, a significant reduction in the load on the blower, a significant reduction in the system's energy consumption, a significant reduction in the system's maintenance costs (energy consumption, auxiliary equipment, spare parts, and labour), and the use of any available filter media (polyester, polypropylene, acrylic, PPS Any existing media (polyester, polypropylene, acrylic, PPS, aramid, P84, PTFE, glass fibre and various compliant media and their treatments, including PTFE laminates) adapted to the requirements of the system can be used, and the existing bags can still be used as emergency spares (or mixed). Advantages of pleated bags 1: Pleated bags offer a simple and efficient solution to increase the filtration area of an existing dust collector and are suitable for applications that require a reduction in differential pressure (increase in blowing intervals), a reduction in dust collector footprint, or an increase in the flue gas capacity of the dust collector, without changing the structure of the dust collector system. 2: It can be manufactured with all kinds of suitable filter media, and the temperature can reach 350 degrees. 3: Better dust cleaning effect