| 摘要 |
The present invention relates to filtration material, more particularly, filtration material that is suitable for air filtration in heating, ventilating, and air conditioning systems. The primary objective of a high performance air filter is to provide maximum particle removal while maintaininng an acceptable pressure drop. Conventional fibrous filters obtain improved particle removal efficiency by using filaments having small diameter, which can be packed closely together. This close packing results in smaller voids between the fibers, which increases the probability that particles will be intercepted by a fiber. This increase in particle removal is, however, accompanied by an increase in pressure drop. Excessive pressure drops can restrict air flow and shorten filter life. This invention provides filtration material comprising a web comprising continuous, meltblown fibers and staple, electrically charged fibers randomly dispersed among the continuous fibers. The filtration material can be formed in planar configurations and in configurations other than planar. Non-planar configurations can extend the useful working area for a given filter element's cross-section without requiring an additional corrugating or pleating process step. The filtration material exhibits high strength and low pressure drop. |
