Abstract:

In order to improve the yarn strength, a kind of hollow spindle with spiral guiding grooves was proposed to solve the problem of low yarn strength for air jet vortex spinning. In this paper, the numerical simulation method was used to study the flow field characteristics of the twisting chamber of air jet vortex spinning based on hollow spindle with spiral guiding grooves and to verify the improved effect of spiral guiding groove structure of hollow spindle on the yarn property. The results show that the spiral guiding groove structure can guide the flow of air and increase the twisting action of the free-end fiber. In addition, the existence of spiral guiding grooves causes the static pressure and velocity of the airflow inside and outside the grooves to be different, which results in the migration and self-twist of the free-end fiber, and further improves the yarn strength of the air jet vortex spinning.

Key words: air jet vortex spinning, hollow spindle, spiral-guided groove, numerical simulation, yarn strength