The working principle of the vacuum cleaner is that the motor of the vacuum cleaner rotates at a high speed, and the air is sucked from the suction port to generate a certain vacuum in the dust box. In the dust filter bag, the filtered air enters the motor through a layer of filter. This layer of filter is a protective barrier to prevent the dust bag from breaking and dust from being sucked into the motor. The air entering the motor flows out through the motor. wear, so a filter is added before it flows out of the vacuum cleaner.

The finer the filter material, the cleaner the air can be filtered, but the poorer the air permeability, which affects the air volume sucked by the motor and reduces the efficiency of the vacuum cleaner. But for users, convenience and cleanliness is the main thing.

Its air permeability is low, so it is made into a wave shape to increase the air permeability area. Some of this filter material can also be washed repeatedly. Any filter material has a "life", that is, the pores of the filter material have been blocked by small particles of dust after long-term use. Therefore, paper dust bags are ideal, which are disposable, hygienic and convenient. The fibers of the cloth filter bag will be hardened after cleaning, which will affect the filtering effect and ventilation effect. The SMS three-layer composite filter material is washable, but the air permeability is slightly lower.