Abstract: In this paper, experimental schemes are designed by Box-Behnken method. The software Minitab 16 is introduced to analyze the influence of process parameters of air jet vortex spinning on properties of bamboo pulp fiber vortex colored spun yarn, which makes for broadening varieties of vortex spun yarn and improving productivity of traditional colored spun yarn. Research results show that effect of yarn formation process on the tenacity of air jet vortex colored yarn spun by bamboo pulp fiber is complicated, and the effect of yarn delivery speed and yarn linear density on yarn tenacity depends on the change of nozzle pressure. The evenness of colored yarn is affected principally by yarn delivery speed and yarn count. Increasing yarn delivery speed makes yarn’s evenness value decrease and then increase. However decreasing yarn linear density will significantly deteriorate yarn evenness. Yarn hairiness is influenced mainly by nozzle pressure and yarn delivery, which becomes more when decreasing nozzle pressure and increasing yarn delivery. Yarn diameter is affected primarily by nozzle pressure and yarn count. Enhancing nozzle pressure and decreasing yarn linear density result into the obvious decrease of yarn diameter.

Key words: air jet vortex spinning, colored spun yarn, process parameter, response surface analysis