Method for producing cellulose shaped-bodies

B - Operations – Transporting – 29 – C

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B29C 67/06 (2006.01) D01D 5/06 (2006.01) D01F 2/00 (2006.01)

Patent

CA 2385227

The invention relates to a method for producing cellulose shaped bodies such as fibers, filaments or films from TCF- or ECF bleached cellulose wherein cellulose is dissolved in an aqueous tertiary amine oxide to produce a formable cellulose solution. The cellulose solution is shaped and thereby the shaped body is formed by coagulation of the shaped solution. Said method is characterized in that in order to reduce the degree of cellulose degradation, TCF-bleached cellulose having a carboxyl group content in the range of 1 to 35 µmol/g or ECF-bleached cellulose having a carboxyl group content in the range of 1 to 50 µmol/g is employed. The inventive method enables said cellulose shaped-bodies to be produced having a reduced degree of cellulose degradation.

L'invention concerne un procédé de production de corps façonnés en cellulose, tels que des fibres, des filaments ou des films, à partir de pâte de cellulose blanchie sans chlore total ou sans chlore élémentaire. Selon ledit procédé, on dissout la pâte de cellulose dans un aminoxyde tertiaire aqueux pour obtenir une solution de cellulose façonnable, puis on met en forme la solution de cellulose et par coagulation de la solution mise en forme on obtient le corps façonné. Ce procédé se caractérise en ce que, pour réduire la décomposition de la cellulose, pendant sa mise en oeuvre, on utilise une pâte de cellulose blanchie sans chlore total, présentant une teneur en groupes carboxyle comprise dans la plage 1-35 µmol/g ou une pâte de cellulose blanchie sans chlore élémentaire, présentant une teneur en groupes carbonyle comprise dans la plage 1-50 µmol/g. Ce procédé permet de produire des corps façonnés en cellulose avec une faible décomposition de la cellulose.

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