Method and apparatus for making a fibrous electret web using a wetting liquid and an aqueous polar liquid
US6406657B1 · kind B1 · utility
69Cited by
46References
46Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1999 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Oct 8, 2019 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M2101/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for imparting an electrostatic charge to a nonwoven fibrous web 20. The fibrous web 20 is wetted with a wetting liquid 24, followed by being saturated with an aqueous polar liquid 30 and drying 31. The resulting dried product is an electret article 43 that could be used as an air filter in, for example, a respirator 50.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.