1) Bulk density: reflects the characteristics of fiber stacking;
2) The twist angle and crimp of the fiber: reflect the straightness of the fiber along the yarn axis;
3) Number of joints and twist direction of strands:
4) Linear density (diameter) and coefficient of variation: reflect yarn thickness and changes
5) Advantages between fibers (conflict factor, entanglement, advantage fragments or slip length, etc.): reflect the stability of the yarn layout.
