Numerical Study of Field Strength at Compact Groove in Compact Spinning with Inspiratory Groove

For several decades, development efforts in ring spinning were focused on improving the existing technology and incorporating automation and process-linking capabilities. It is well known that compact spinning technique has been introduced as one of the best spinning innovations of this century. The concept behind the spinning technology is that the strand of fibers issuing from the drafting system is condensed (usually pneumatically) and this gives the yam a more compact structure and a superior quality, especially in terms of hairiness and strength. In compact spinning, compact groove is a pivotal organ by which fibers motion is controlled. The theoretical approach of airflow distribution at compact groove, however, is still lacking. In this paper, a geometric-probabilistic method was adopted, and airflow distribution at compact groove was described and the probability of fiber compacting was analyzed. The new concept of compact degree and inhalation rate were defined in this paper and the relationship between the compact groove parameters and sliver width was discussed with mathematical deductions. This theoretical method can improve compact spinning effect and analyze airflow distribution at compact groove. The results show that it will have the best compact effect when the parameters of the compact groove, sliver width and airflow distribution satisfy certain equation which is based on the hypothesis for compact degree equaling the inhalation rate. The new method is an alternative way different from fluid dynamics and proves to be available.