Spin draw process of making partially orientated yarns from...

D - Textiles – Paper – 01 – F

Patent

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D01F 6/62 (2006.01) D01D 5/16 (2006.01)

Patent

CA 2425267

A spin draw process for making partially orientated yarn from polytrimethylene terephthalate comprising the steps of: (a) extruding and spinning polytrimethylene terephthalate and forming a monofilament or multifilament yarn therefrom, (b) heating the yarn by contacting it with a first pair of godets moving at a temperature to give a yarn temperature above the glass transition temperature and less than the cold crystallization temperature of polytrimethylene terephthalate yarn, (c) moving the yarn between the first godet pair and a second pair of godets, and (d) winding the yarn at a speed of 1 to 15% less than that of the second godet pair and at temperature less than the glass transition temperature of polytrimethylene terephthalate yarn.

L'invention concerne un procédé de filage par étirage permettant de produire un fil partiellement orienté à partir de polytriméthylène téréphtalate. Ce procédé comprend les étapes suivantes : (a) on extrude et on file le polytriméthylène téréphtalate afin de former un fil monofilament ou multifilament avec ce dernier, (b) on chauffe le fil obtenu en le faisant entrer en contact avec une première paire de godets de filage mobiles dont la température permet de chauffer le fil à une température supérieure à la température de transition vitreuse et inférieure à la température de cristallisation à froid du fil de polytriméthylène téréphtalate, (c) on déplace le fil entre une première et une seconde paire de godets de filage, et (d) on enroule le fil à une vitesse de 1 à 15 % inférieure à la vitesse de la seconde paire de godets de filage, à une température inférieure à la température de transition vitreuse du fil de polytriméthylène téréphtalate.

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