Structural and mechanical properties of pure cotton ring-spun yarn and its strength calculating method

Predicting yarn strength with fiber properties and yarn design parameters is very important for reasonable use of fiber raw material,lowering the cost and ensuring yarn quality.The structural and mechanical properties of ring-spun yarn have been studied comprehensively.The relationships between yarn linear density,yarn twist,and the relative yarn structural and mechanical properties have been obtained.Through statistical analysis of yarn linear density,twist,and strength of 200 groups of pure cotton yarn,and considering some influence factors,such as carded or comed,application of long-staple cotton,experiential functions of yarn relative strength with yarn linear density and twist have been obtained. Considering the above mechanical properties and the experiential functions,a pure cotton ring-spun yarn strength culculation equation has been established based on continuous medium theory.The equation is characterized by easy use,high precision in prediction of the strength of pure cotton yarn.The relationship between predicated value and tested value is linearity,and the determination ratio of regression equation is as high as(0.962 3).