Motion Profile
The mathematical pattern describing the smooth acceleration and deceleration of heddle frames during the loom’s shedding cycle reduces yarn stress. Implementing a sinusoidal shedding curve minimizes the sudden mechanical impacts on the warp yarns compared to linear or step-like shedding motions. This smooth transition is generated by eccentric cams or electronically controlled motors.
Weaving technicians specify this motion profile in the loom’s control unit before running high-density linen weaves.
Stress Reduction
Because flax yarns have low elongation limits, they are highly sensitive to sudden changes in tension during the shed opening. Utilizing a sinusoidal shedding curve ensures that the warp yarns are stretched gradually, reaching their maximum elongation at the center of the dwell phase. This progressive strain reduces the occurrence of dynamic stress spikes that cause yarn breakages in raw linen.
By lowering the peak forces, mills can operate their looms at higher speeds without compromising yarn integrity. The resulting reduction in yarn breaks is recorded in the mill’s daily efficiency report, providing a clear benefit for the overall output of the factory.
Fabric Finish
This gentle shedding motion also helps to prevent abrasion of the warp yarns, resulting in a cleaner fabric surface. This cosmetic improvement is documented in the finished fabric quality log. The choice of curve profile depends on the yarn count and weave density.
