Strand Stability
Mechanical tension applied to the loosely assembled fiber strand during winding and unwinding prevents drafting defects. This tension, known as roving tension, must be kept within narrow limits to prevent the roving from stretching or breaking. Since roving has very low twist, it has little cohesive strength and is highly sensitive to excessive pull.
Proper tension management is therefore necessary for maintaining the integrity of the flax roving.
Winding Control
Controlling the speed of the flyer and the bobbin on the roving frame regulates the tension as the bobbin diameter increases. If the roving tension is too high, the strand stretches unevenly, creating thin places that later break on the wet spinning frame. Conversely, if the tension is too low, the roving will sag and tangle, disrupting the winding process.
Automated sensors monitor this force and adjust the motor speeds continuously to compensate for the changing bobbin weight. This precision prevents defects before the spinning stage.
Processing Uniformity
Stable tension ensures that the roving unwinds smoothly from the bobbin when fed into the wet spinning bath. This consistency results in a more uniform draw and a higher quality yarn. The finished yarn exhibits fewer thin places and a more even appearance.
