Integrated nonwoven laminate material
Filter media having large interfiber pores and, thus, a high permeability typically contain sparsely packed relatively thick fibers. Such filter media require relatively low driving pressure to provide adequate filtration throughput rate and service life. However, highly permeable filter media, e.g....
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
18.11.2003
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| Online Access | Get full text |
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| Summary: | Filter media having large interfiber pores and, thus, a high permeability typically contain sparsely packed relatively thick fibers. Such filter media require relatively low driving pressure to provide adequate filtration throughput rate and service life. However, highly permeable filter media, e.g., residential glass fiber HVAC filters, only provide a low filtration efficiency in that the large interfiber pore structures of the media do not have interstitial configurations that are suitable for entrapping fine contaminant particles. Consequently, coarse fiber, highly permeable, filter media have not been used in fine particle filtration applications.
An integrated nonwoven laminate material suitable for use as a filter medium having a microfiber layer integrated with a low loft multicomponent spunbond layer and a high loft multicomponent spunbond layer and a method of producing the integrated nonwoven laminate material. In one embodiment of this invention, a laminate material is through-air bonded to form an integrated nonwoven laminate material which is then electret treated to enhance attraction between particles being filtered and the fibers of the integrated nonwoven laminate material. In one embodiment of this invention, the integrated nonwoven laminate material is used as a filter having an ASHRAE Standard 52.1-1992 Dust Spot Efficiency of about 40% to about 95% and an ASHRAE Standard 52.2-1999 MERV (Minimum Efficiency Reporting Value) of 12 to 16. |
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