The room temperature polyester needle punched felt dust removal bag has the advantages of high porosity, good breathability, dust collection, and long service life unique to ordinary felt filter cloth. Due to its moderate temperature resistance, up to 150 ° C, moderate acid resistance, alkalinity, and excellent properties, it has become a widely used variety of felt filter materials. The surface treatment method can be singeing, calendering, or coating according to different requirements of industrial and mining conditions.