Method for producing cellulosic forms

D - Textiles – Paper – 01 – F

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D01F 2/00 (2006.01) C08B 16/00 (2006.01) C08J 3/28 (2006.01) C08J 5/18 (2006.01) C08L 1/02 (2006.01) D01F 13/02 (2006.01)

Patent

CA 2344162

The invention relates to a method for producing cellulosic forms, such as fibres, filaments, films, membranes or tubes by a) extruding a solution of cellulose in a hydrous amine oxide, especially N-methylmorpholine-N-oxide, through a moulding tool, over an air gap, and coagulating the form in an aqueous precipitating bath containing amine oxide and b) guiding the form through at least one washing stage in order to remove the residual amine oxide. The method is characterised in that the precipitating bath liquid and/or the washing liquid are treated with ultraviolet radiation in the precipitating stage and/or in the washing stage(s) respectively. This prevents the formation and spread of coatings, films and secretions of slime formed by micro-organisms on the parts of the system that come into contact with the NMMO-containing liquor.

L'invention concerne un procédé de production de corps moulés cellulosiques, tels que des fibres, des filaments, des films, des membranes ou des flexibles. Ce procédé consiste a) à extruder une solution cellulosique par un moule à travers un espace d'air dans un oxyde aminé contenant de l'eau, notamment un N-méthylmorpholin-N-oxyde et à coaguler le corps moulé dans un bain de précipitation aqueux contenant un oxyde aminé, et b) à soumettre le corps moulé à au moins une opération de lavage pour enlever l'oxyde aminé résiduel. L'invention est caractérisée en ce que l'on traite le liquide de bain de précipitation à l'étape de précipitation et/ou le liquide de lavage de l'étape ou des étapes de lavage par un rayons ultraviolets. On évite ainsi la formation et la propagation des revêtements, des films formés par des micro-organismes et de l'isolation des mucosités sur les parties de l'installation qui sont en contact avec les liquides contenant du NMMO.

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