Apparatus and method for spinning hollow polymeric fibres

Details Apparatus and method for spinning hollow polymeric fibres Apparatus and method for spinning hollow polymeric fibres

D - Textiles, Paper

01

D

D01D 5/24 (2006.01) D01F 9/22 (2006.01)

Patent

CA 2232037

A method of manufacture of solid-walled hollow polymeric fibres comprises the steps of dissolving polymeric material in a suitable solvent liquid to form a dope solution (44), extruding the dope solution through an aperture in a spinneret (41) to form a narrow jet of liquid, injecting a coagulant (46) through an aperture (53) in the centre of the liquid dope jet as it leaves the spinneret, directing the jet through an air gap into a coagulant bath containing a further coagulant; and directing the fibre through a drawing bath to reduce the diameter; each coagulant solution being a mixture of a coagulant liquid capable of causing gelation and solidification of the liquid dope jet and between 20 % and 80 % of the solvent liquid.

L'invention concerne un procédé de fabrication de fibres polymères creuses à paroi pleine, comprenant les étapes suivantes: dissolution du polymère dans un solvant liquide approprié pour former une solution à filer (44); extrusion de la solution à filer à travers une ouverture d'une filière (41) pour former un mince jet de liquide; injection d'un coagulant (46) à travers une ouverture (53) au centre du jet liquide de solution à filer au moment ou celui-ci quitte la filière; envoi du jet, à travers une fente d'aération, dans un bain coagulant contenant un autre coagulant; et envoi de la fibre dans un bain d'étirage pour en réduire le diamètre. Chaque solution coagulante est un mélange d'un coagulant liquide capable de provoquer la gélification et la solidification du jet liquide de solution à filer, avec entre 20 et 80 % de liquide solvant.

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