The sewing of the dust bag is an extremely important operation. The manufacture must be accurate, the inspection must be careful, and the deposit must be appropriate. Its good or bad directly affects the life of the filter bag and the power of the dust collector. Therefore, when sewing, it is necessary to work well with the lining mesh of the filter bag, and the force is uniform when tightening, so as to ensure that the upper and lower parts of the filter bag are pointed, and the base filter bag can not affect the falling of the upper filter bag. The strength of the bag and the bottom of the bag are easily lost during the processing. It is a thin place in the use of the filter bag and reinforcement measures must be adopted. The use of the label indicates that the damage to the filter bag is often local, and the central part rarely attacks. The filter bag of the horizontal device is exposed on the outside with easily damaged parts at both ends.