Melt spinning of ultra-oriented crystalline filaments

D - Textiles – Paper – 01 – D

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D01D 5/12 (2006.01) D01D 5/08 (2006.01) D01D 5/088 (2006.01) D01F 6/62 (2006.01)

Patent

CA 2083291

Ultra-oriented, crystalline synthetic filaments (2) with high tenacity are produced by extrusion of a fiber-forming synthetic polymer melt into a liquid isothermal bath (3) maintained at a temperature of at least 30°C above the glass transition temperature of the polymer, withdrawing the filaments from the bath and then winding up the filaments. Polyethylene terephthalate filaments so produced at 3000-5000 m/min exhibit a crystalline structure and possess birefringence of 0.20-0.22, tenacity of 6-8 g/dtex (7-9 g/d), break elongation of 14-30% and boil-off shrinkage of 5-10%.

On produit des filaments synthétiques cristallins ultra-orientés (2) présentant une ténacité élevée, par extrusion d'une fusion de polymère synthétique fibrogène dans un bain isotherme liquide (3) maintenu à une température d'au moins 30 C au-dessus de la température de transition du verre du polymère, par retrait des filaments du bain puis par enroulement de ces derniers. Les filaments de téréphtalate de polyéthylène ainsi produits entre 3000 et 5000 m/min présentent une structure cristalline et possèdent une biréfringence comprise entre 0,20 et 0,22, une ténacité comprise entre 7 et 9 g/d, un allongement de rupture compris entre 14 et 30 % ainsi qu'un rétrécissement de perte par évaporation compris entre 5 et 10 %.

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