Variety rollers are analyzed regarding the spinning quality.

Through production comparison on the frame FA506-FT with the airload cradle DA2122P from the domestic INAproducts as control group, conclusion is made that the airload cradle QYJ3-125V is superior over that of the same kind in spinning quality.

s:Starting from the three factors the durabilty,the dispersity and the roughness of cots,some suggestions are made to the cotton mills on selection and use of cots for higher spinning quality.

Through comparative spinning experiments and anylyse of working principle,it is concluded that the yarn quality is raised,and the CV% value of eveness,slubs,nips and neps are reduced markedly by the use of high accuracy rollers without mechanical wave.

Through the production trial,analysis is done to the application of the domestic spinning draft parts of V shape,pneumatic pressurizing,cots with low rigidity and hi-elasticity,new top and bottom aprons and mid-rollers on the drafting system of the spinning frame in relation to quality of resultant yarn.

Exploration is done to the relationship of cot structure,cot rigidity to evenness of the resultant yarn and yarn strength;relationship of cot rigidity to friction factor and linear width of nipper jaws;relationship of cot diameter and telescoping tolerance to quality of resultant yarn.

Details introduction is done to how to do process configuration and aborative management for upgrading quality of resultant yarn with big draft process.