Rieter

Concluding remarks on the spinning triangle

Index

One further remark is required when summarizing the entire reasoning behind the spinning triangle. Experts generally discuss what happens at the spinning triangle by concentrating on the length of the triangle, although the main influencing factors are in fact the angles, as is shown by this investigation. However, since these angles mainly depend on the length and vice versa, this simplification is admissible and is used here, too. Using length as the criterion, it can be stated that long as well as short spinning triangles have their advantages and disadvantages. Long spinning triangles might increase the ends down rate by enlarging the “spinning triangle” weak point and increase hairiness, since the hairiness of the yarn also depends to a great extent on the area of the spinning triangle. On the other hand, a short spinning triangle also results in an increase in hairiness and fly accumulation as well as a reduction in yarn strength due to the difficulties in tying in the edge fibers, and due to irregular distribution of fiber tension in the yarn structure. The latter is also responsible for an increase in the ends down rate. As is nearly always the case in spinning, the problem is to find the optimum balance. It is therefore evident that as long as a significant spinning triangle exists, perfect yarn structure with excellent spinning performance cannot be achieved. In order to improve yarn quality and spinning performance significantly, it is necessary to find ways to reduce the size of the spinning triangle drastically, and above all to reduce the width of the fiber flow exactly to the width of the remaining spinning triangle. This has been achieved by so-called  compact spinning systems.