Abstract: It is well known that jet vortex yarn is formed by high speed air vortex in vortex tube to entangle the fibers. In order to study the influence of the vortex tube’s jet orifice parameters on the spinning, the vortex tube’s jet orifice parameters (jet orifice diameter, jet orifice obliquity, jet orifice number) were discussed. The two jet orifice diameters (0.5 mm, 0.6 mm) were chosen, seven jet orifice obliquities (30.0°, 32.5°, 35.0°, 37.5°, 40.0°, 45.0°, 50.0°), three jet orifice numbers (4, 5, 6) were selected based on the two diameters, with viscose as raw material for spinning experiments in small sample machine of jet vortex spinning, experimental results indicate that: the quality of the yarn is good and the energy consumption is small under the condition of jet orifice obliquity is 45.0°, jet orifice diameter is 0.5mm, jet orifice number is 4.

Key words: vortex spinning, nozzle, vortex tube, jet orifice parameter