Method of manufacturing a composite filter media
US7922959B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 2008 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Aug 1, 2028 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D5/0069
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of making a composite filter media includes, in an exemplary embodiment, forming a nonwoven fabric mat that includes a plurality of synthetic fibers by a spunbond process, and calendering the nonwoven fabric mat with embossing calender rolls to form a bond area pattern comprising a plurality of substantially parallel discontinuous lines of bond area to bond the synthetic fibers together to form a nonwoven fabric, the nonwoven fabric having a filtration efficiency of about 35% to less than 50%, measured in accordance with EN 1822 (1998) test procedure. The method also includes applying a nanofiber layer by electro-blown spinning a polymer solution to form a plurality of nanofibers on at least one side of the nonwoven fabric mat to form the composite filter media, the composite filter media having a minimum filtration efficiency of about 70%, measured in accordance with EN 1822 (1998) test procedure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.