Process for achieving higher orientation in partially...

Details Process for achieving higher orientation in partially... Process for achieving higher orientation in partially...

D - Textiles, Paper

01

D

18/624

D01D 10/02 (2006.01) D01D 5/092 (2006.01) D01F 6/62 (2006.01)

Patent

CA 1194261

ABSTRACT OF THE DISCLOSURE Provided is a process for melt spinning a partially oriented yarn of increased birefringence, and hence higher orientation, for a given wind-up speed. The process comprises extruding a molten fiber forming polyester through a shaped orifice to form a molten filamentary material, which is then passed in the direction of its length into a quench zone wherein the filamentary material is contacted with a first gaseous quenching medium. While the filamentary material is still in a deformable state, however, it is passed through a hot zone provided with an atmosphere having a temperature greater than the first gaseous quenching medium and greater than the glass transi- tion temperature of the molten polyester filamentary material. The filamentary material is then withdrawn from the hot zone and contacted with a second gaseous quenching medium at a temperature below the glass transition temperature of the filamentary material until the filamentary material is no longer deformable, after which the filamentary material is withdrawn from the quench zone. -1-

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