High stiffness nonwoven filter medium
US5709735A · kind A · utility
119Cited by
77References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1995 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Oct 20, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249964
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter medium having high stiffness is provided. The filter is a nonwoven web of conjugate fibers which has a Frazier permeability above 200 CFM, an NaCl efficiency above 75 percent, a Gurley Stiffness above 700 mg, and a SEP value of above 80. The conjugate fibers may be polyolefin, more particularly polypropylene and polyethylene in a side-by-side configuration. The medium may be made into a filter by conventional means such as pleating. Such filters are useful in HVAC systems and transportation cabin air filtration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.