Kinematical And Mechanic Analysis On Fiber Strand In Compact Zone Of Compact Spinning System

The existence of twisting triangular has a significant influence on the quality of ring-spunyams. Many research institutes, companies and university have spend a lot of human and materialresources on minimizing the twisting triangular and inhancing the yarn quality. As to theextensively-used air compact spinning devices, the yarn quality and the production efficiency willbe greatly improved by modeling the motion and mechanic of fiber strand in the compacting zone.Theoretical analysis and experimental study show that:1. Modeling the additional twists on the motion analyzing of fiber strand in compact zone,which is improved by the following experiences on compact yarns.2. Model the additional twists on the mechanical analyzing of fiber strand in the compactzone3. There are 5 factors contributing to the additional twists, including the curvature radius Rof the shaped tube, the frictional coefficientμbetween the fiber strand and lattice apron, contactangleθof the suction slot to the shaped tube, the slop angleβof the suction slot and the negative pressure p on the fiber strand per meter. The additional twists raises with the increase ofμ,θ,β, p,but reduce with the increase of R, with the length of suction slot settled. It can be greatly affectedbyθ,β,p.4. Model the additional twists of fiber strand in broken-lined suction slotfind there is not much variation in additional twists with different cross point.5. Model the additional twists of arc suction slotandthe numerical integration shows that the additional twists of arc suction slot is lessthan that of broken-lined.6. The tension, friction and twists of the fiber strand change greatly at thecrossing point, which maybe increase the yarn hairiness and impact the yarn evenness.But on the arc suction slot it will not, so the arc suction slot may be more suitable forthe air compact device.