Process for manufacturing cellulose moulded bodies

Details Process for manufacturing cellulose moulded bodies Process for manufacturing cellulose moulded bodies

D - Textiles, Paper

01

F

D01F 2/02 (2006.01) C22C 14/00 (2006.01) D01F 2/00 (2006.01)

Patent

CA 2174094

- 18 - The invention is concerned with a process for the production of cellulose moulded bodies wherein a suspension of cellulose in an aqueous solution of a tertiary amine-oxide is transformed into a mouldable solution, said solution being extruded by means of a forming tool and conducted into a precipitation bath. The process is characterized in that at least part of the materials in devices and pipes for the transportation and processing of the solution, which material is in contact with the mouldable solution contains at a minimum of 90% up to a depth of at least 0,5 µm, preferably more than 1 µm, at least one element of the group consisting of titanium, zirconium, chromium and nickel in elementary form and/or in the form of compounds provided that the remaining of the material does not contain any of the elements of the group consisting of copper, molybdenum, tungsten or cobalt. By means of the use of certain elements and compounds according to the invention, it is possible to control the occurrence and the extent of exothermal degradation reactions in the cellulose solution.

La présente invention concerne un procédé de fabrication de pièces moulées en cellulose, selon lequel une suspension de cellulose dans une solution aqueuse d'un oxyde d'amine tertiaire est convertie en solution apte au moulage, laquelle est extrudée à l'aide d'un outil de façonnage et placée dans un bain de regénération. Ce procédé est caractérisé en ce qu'une partie au moins des matériaux se trouvant dans les appareils et dans les conduits de transport et de traitement de la solution et qui sont en contact avec la solution apte au moulage contient au moins un élément du groupe titane, zirkonium, chrome et nickel sous forme élémentaire ou sous forme de composés, jusqu'à une profondeur d'au moins 0,5 µm et, de préférence, supérieure à 1.0 µm, et dans une proportion d'au moins 90 %; le reste de la composition ne doit contenir aucun des éléments cuivre, molybdène tungstène ou cobalt. Cette manière d'utiliser certains éléments et composés permet d'empêcher ou de limiter les réactions de décomposition exothermique dansla solution de cellulose.

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