METHOD FOR THE MANUFACTURE OF FIBRES, FILM AND OTHER PRODUCTS FROM MODIFIED SOLUBLE CELLULOSE

The method for the manufacture of fibres, films and other products from modified, soluble cellulose consists in that the starting cellulose pulp in a suspension of water, aqueous buffer with pH not lower than 2.5 and/or in an aqueous solution of enzymes like xylanases or cellulases is mechanically or enzymatically pretreated. Afterwards, the pretreated cellulose pulp, after a possible removal of the water - or solution surplus, is subjected to an enzymatic treatment with an aqueous solution of an enzyme composition containing a cellulase, preferably originated from Aspergillus niger or Trichoderma reesei fungi with an endo-1,4- beta -glucanase activity not lower than 0.1 U/cm , preferably 1-3 U/cm , beta -glucosidase activity not lower than 0.01 U/cm , preferably 0.05-0.1 U/cm , filter paper activity FPA not lower than 0.01 U/cm , preferably 0.1 to 1.0 U/cm , and/or xylanases, preferably originated from Trichoderma reesei fungi with endo-1,4- beta -xylanase activity not lower than 0.5 U/cm , preferably 30-100 U/cm . The surplus of the enzymatic solution is next removed and the enzymes remaining in the cellulose are deactivated by water-washing at temperature above 60 DEG C. The obtained cellulose pulp is dissolved in aqueous solution of alkali metal hydroxides with concentration not lower than 5%, at temperature not lower than 0 DEG C, during at least 1 minute. The obtained alkaline cellulose solution is filtered and deaerated and subjected to coagulation in water or in an aqueous solution of an acid. The manufactured cellulosic products are washed with water to a neutral reaction and possibly dried.