Method for making shaped filtration articles
US8029723B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2007 |
| Grant date | Oct 4, 2011 |
| Priority date | — |
| Expiry date | Jun 26, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D46/521
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Shaped filtration articles are made from a monocomponent nonwoven web formed by flowing first and second fiber-forming materials of the same polymeric composition through first and second die cavities in respective fluid communication with first and second sets of orifices in a meltblowing die tip. The first fiber-forming material flows at a lesser flow rate or viscosity through the first die cavity and first set of orifices to form a set of smaller size filaments and the second fiber-forming material flows at a greater flow rate or viscosity through the second die cavity and second set of orifices to form a set of larger size filaments. The collected nonwoven web contains a meltblown bimodal mass fraction/fiber size mixture of intermingled continuous microfibers and larger size fibers of the same polymeric composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.