Filament Radial Displacement
Interweaving of individual filaments within a spun yarn occurs through radial movement during twisting. Fiber migration mechanics describes the physical laws governing this movement, which is essential for providing the yarn with structural integrity and strength. If fibers did not migrate, the yarn would consist of concentric layers that could easily slide apart.
In flax spinning, the relatively stiff and long nature of the fibers complicates this movement compared to shorter, more flexible cotton fibers.
Yarn Tenacity Development
Achieving a stable yarn structure requires that a sufficient number of fibers transition through the radial zones of the yarn cross section. The level of fiber migration mechanics observed during wet spinning depends on the spindle speed and the tension applied at the drafting zone. High migration leads to a more compact and durable yarn that can withstand the stresses of weaving.
Chinese spinners monitor this behavior to ensure that the yarn does not shed too many surface fibers, a condition known as pilling. The frictional properties of the flax surface also influence how easily the filaments lock into place.
Drafting Influence Limit
Excessive tension during the drafting stage can restrict the ability of fibers to change positions. This lack of movement produces a yarn with a weak core. Core strength fails.
