Process for the preparation of cellulose fibres from pine

Details Process for the preparation of cellulose fibres from pine Process for the preparation of cellulose fibres from pine

D - Textiles, Paper

21

C

9/13, 8/80

D21C 3/06 (2006.01) D21C 9/08 (2006.01)

Patent

CA 1133660

ABSTRACT OF THE DISCLOSURE The present invention provides a process for the prep- aration of cellulose fibres from pine, which are of the medium- viscosity to high-viscosity type, wherein the cellulose fibres obtained from pulping pine in sulphite cookers are treated, when required with a quantity of chlorine, which corresponds to between 0.01 and 20% by weight of the quantity of chlorine used in clas- sical bleaching procedures applied to sulphite process cellulose fibres from pine, and/or wherein said cellulose fibres from pine, which have not been delignified further or only to a very limited extent in this treatment with chlorine, are pretreated, when required in an acidic medium, whereupon said cellulose fibres from pine are refined with alkali at an elevated temperature, and thereafter delignified in an alkaline, aqueous medium with per- oxide compounds, and then bleached by applying conventional single-stage or multi-stage bleaching procedures.

311653

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