Process for manufacturing filaments from an optically...

Details Process for manufacturing filaments from an optically... Process for manufacturing filaments from an optically...

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D01D 5/06 (2006.01) D01D 4/02 (2006.01) D01F 6/60 (2006.01)

Patent

CA 2235827

The invention pertains to a process for manufacturing filaments from an optically anisotropic spinning solution in which the spinning solution is extruded through spinning orifices grouped in at least one spinning section and the extrudates are passed through an inert gas and a coagulation bath in succession, with the ratio of the spacing of the spinning orifices to the width of the spinning section being more than 0.15 and less than 0.7, and the width of the spinning section being less than 5 mm. The invention makes it possible to spin a plurality of filaments of good physical properties at a high speed and a comparatively high acid concentration in the coagulant without widespread sticking.

L'invention porte sur un procédé de fabrication de filaments à partir d'une solution à filer, optiquement anisotrope, lequel procédé consiste à extruder la solution à filer à travers des orifices de filage groupés dans au moins une section de filage, et à faire passer les extrudats successivement dans un gaz inerte et dans un bain de coagulation, le rapport d'espacement entre les orifices de filage et la largeur de la section de filage étant supérieur à 0,15 et inférieur à 0,7, et la largeur de la section de filage étant inférieure à 5 mm. L'invention permet de filer une pluralité de filaments présentant de bonnes propriétés physiques, à une vitesse élevée et avec une teneur acide élevée dans le coagulant sans effet de collage étendu entre les filaments.

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