Method for forming an electrostatic fibrous filter web
US5800769A · kind A · utility
11Cited by
18References
8Claims
0Family size
Inventor
Key dates
| Filing date | May 8, 1997 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | May 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
There is provided a method for forming a nonwoven electret fiber filter with a nonwoven web of electret fibers needle-punched to an open scrim support. The scrim support material has individual discrete open areas with an average cross-sectional area as viewed from the plane of the filter media of at least 0.25 mm.sup.2, preferably 1.0 mm.sup.2, and a pressure drop across the scrim support, without the filter web, of less than 1.5 mm H.sub.2 O measured at 98.4 meters/min gaseous face velocity. The resulting filter has enhanced lifetimes, a low pressure drop and high filtration efficiencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.