Use of polyalkylene oxides for the separation of cellulose fibres.

摘要

Unbleached sulphate fibres are chemically separated from other fibres by the use of high molecular weight polyalkylene oxides, preferably polyethylene oxide. The polyalkylene oxides are added to aqueous suspensions of the fibre mixtures and hereby flocculate 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.