Monitoring concentration of dope in product manufacture

Details Monitoring concentration of dope in product manufacture Monitoring concentration of dope in product manufacture

D - Textiles, Paper

01

F

D01F 2/00 (2006.01) B29C 47/92 (2006.01) G01N 21/41 (2006.01)

Patent

CA 2163259

Monitoring means are provided to control the concentration of a dope of cellulose/amine oxide/water solution for use in the manufacture of continuous filaments of solvent-spun cellulose. The dope may be formed by preparing a mixture of cellulose amine oxide solvent and water, and heating the mixture to drive off excess water to form the hot dope solution which is then passed to a die assembly which forms strands from the dope which are then further processed to make the filaments of solvent-spun cellulose. The concentration of the solution is monitored by measurement of its refractive index and maintenance of the refractive index within specified limits by adjustment of the water content ensures that the dope concentration is such as to produce a good product.

Des éléments de contrôle sont prévus pour réguler la concentration d'une solution à filer contenant de la cellulose, de l'oxyde d'amine et de l'eau et s'utilisant dans la fabrication de filaments continus de cellulose filée avec un solvant. On peut obtenir la solution à filer en préparant un mélange de cellulose, de solvant d'oxyde d'amine et d'eau, et en chauffant ce mélange pour retirer l'eau excédentaire afin de produire la solution à filer chaude qui est ensuite passée dans un ensemble de filières qui forment des brins à partir de la solution à filer, ceux-ci étant ensuite traités pour fabriquer les filaments de cellulose filée avec un solvant. On procède au contrôle de la concentration de la solution en mesurant son indice de réfraction et en maintenant celui-ci dans des limites spécifiées en ajustant la teneur en eau, ce qui permet de s'assurer que la teneur de la concentration de la solution à filer est correcte pour obtenir un bon produit.

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