Filter material formed by fibride particles
US5141643A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1991 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Mar 7, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D39/1623
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In a filter bed (11) for the solid/fluid separation of media which contain substances that attack or dissolve cellulose, for example cellulase-containing enzymes, a matrix comprising a fibrous material structure of polyolefin fibrid particles (12) which are matted and anchored in one another and which can additionally contain up to 20% by weight of narrower fibrid polyolefin fibres and/or polyolefin fibres that have a fibre length of up to 5 mm. and have just started to fibrillate, in order to strengthen the sheet formation of the matrix. The actual filter-active particles, in particular kieselguhr particles and/or perlite particles having grain sizes of 5 to 100 um., are embedded in the cellulose-free fiber matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.