Polyester non-woven fabrics​ are made by distributing polyester filaments evenly on the running screen curtain through equipment such as screw extruder and spinneret at a specific temperature and pressure to form a fluffy fiber web, and then A non-woven fabric formed by repeated puncturing by a needling machine.

Dry filter element material is filter paper or non-woven fabric. In order to increase the air passing area, most of the filter elements are processed with many small folds. When the filter element is slightly dirty, compressed air can be used to clean it. When the filter element is seriously dirty, the new filter element should be replaced in time.