Use of polyalkylene oxides for the separation of cellulose fibres
US4362600A · kind A · utility
1Cited by
2References
5Claims
0Family size
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Key dates
| Filing date | Aug 12, 1981 |
| Grant date | Dec 7, 1982 |
| Priority date | — |
| Expiry date | Aug 12, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Unbleached sulphae fibres are chemically separated from other fibres by the use of high molecular polyalkylene oxides, preferably polyethylene oxide. The polyalkylene oxides are added to aqueous suspensions of fibre mixtures and hereby flocculates unbleached sulphate fibres in a selective manner and the flocks can be separated by known methods such as sedimentation, flotation, filtration etc. Use of polyalkylene oxides for selective flocculation of unbleached sulphate fibres gives the possibility of upgrading for example recovered fibres, broke and secondary fibre raw materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.