Patent ID: 6746641
Filing Date: 2004-06-08
Classification: C08B,C08J,D01F,Y02P

Abstract:
A process to avoid formation and growth of coatings, films and slime aggregates formed by microorganism in the production of formed cellulosic articles, such as fibres, filaments, sheetings, membranes or tubes, comprisinga) extruding a solution of cellulose in an aqueous amine oxide, particularly N-methylmorpholine N-oxide, through an extrusion die via an air gap and coagulating the formed article in an aqueous precipitation bath containing amine oxide, and b) passing the formed article through at least one washing stage for removing residual amine oxide, characterized in that the liquor of the precipitation bath in the precipitation stage and/or the washing liquor in the washing stage(s) is treated with ultra-violet radiation.