Quantifying Mass Yield Loss in Long Line Flax Wet Spinning
Wet spinning long line flax generates 35 to 40 percent mass yield loss from hackling shive ejection, hydrothermal pectin extraction, and ring frame waste.
Hackle Tow Yield
Production Metric
Raw material processing efficiency is measured by the ratio of short fibers removed during the combing of flax stricks compared to the total input weight. This hackle tow yield provides a primary value for the amount of secondary fiber generated before the spinning of long line yarn. It establishes the volume of byproduct available for dry spinning or blending with other natural fibers.
Combing Efficiency
Machine settings and pin density influence the volume of material extracted from the main line during mechanical hackling. High hackle tow yield indicates a coarse raw material or an aggressive setting on the pins that pulls more fiber into the tow cans. Mills monitor this figure to balance the quality of the line fiber against the economic value of the tow.
A well-adjusted hackling line ensures that the removal of short fibers remains within the limits of the grade specifications. Technicians adjust the penetration depth of the pins to prevent excessive loss of valuable long fibers while ensuring the removal of shive.
Input Impact
Scutching quality and moisture content determine how the fiber reacts to the mechanical action of the pins. Dry fiber breaks more easily and increases the hackle tow yield to a measurable degree. Proper conditioning of the flax before processing reduces this breakage.
Consistent monitoring of the byproduct volume allows for adjustments in the speed of the hackling machine to protect the yield of the primary line fiber.