ABSTRACT
Textile materials especially woven and non-woven fabrics are particularly suitable for filtration because of their complicated structures and considerable thickness. Depending on the process of separation, filtration is generally referred to as particle filtration, microfiltration, ultrafiltration, nanofiltration and reverse osmosis. Filter equipment and configurations vary and can be divided into several groups. The two major groups are filters for dry filtration and filters for liquid filtration. For filtration of gases, nonwoven fabrics are mainly used. Needlepunched filters are used in baghouses and fabric filters for dust filtration. Nomex filter bags are used in hot mixed asphalt plants. The Heating, Ventilation, and Air Conditioning industry requires higher standards for air filters because of the importance of indoor air quality. Filters for residential air conditioning systems are usually made of a thick low-density mat of polyester or glass fibers. Important test characteristics with fabrics used in gas and dust filtration include permeability, differential pressure, efficiency, strength and chemical resistance.
