Process for the production of cellulosic fibres
US6645409B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2001 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Jan 6, 2022 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F2/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a process for the production of cellulosic fibers from solutions of cellulose in an aqueous tertiary amine oxide whereby the extruded fibers are led through a precipitating bath and cut and the cut fibers are passed through a series of water baths in the form of a fleece and then dried, whereby the wash baths are connected to each other and fresh washing liquor is applied to the last wash bath and led in countercurrent with the transportation direction of the fibre fleece to the first wash bath. The process in accordance with the invention is characterised in that the pH value of each of these wash baths is maintained higher than 8.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.