Flax Fibre Non Cellulosic Content Impact on Hackling Yield
Non-cellulosic content above 3.5% lowers hackling line yield, increasing tow waste and landed line fibre cost per finished metre.
Sliver Uniformity
Fiber Consistency
Mass distribution per unit length defines the linear density regularity of drawn flax before the spinning frame. Sliver uniformity assesses this mass variance to ensure evenness in the resulting yarn. High variation leads to weak points in the thread and structural failure during high tension loom operations.
Sensors on the drafting machine detect these deviations by measuring the signal voltage across the cross section.
Drawing Variance
Automated quality control protocols govern the acceptable limits of mass deviation allowed within a single production lot. Mills reject batches when the coefficient of variation exceeds the threshold specified in the purchasing contract. Operators monitor the drafting rollers to correct alignment issues that cause periodic thickness changes.
Corrective adjustments to the ratch setting reduce the impact of these irregularities on the drafting force. Constant tracking of these readings provides a reliable basis for the calculation of the final yarn strength and prevents the accumulation of thick or thin zones that compromise fabric integrity.
Measurement Protocol
Statistical analysis of the mass signals yields the value used for batch certification in international export documents. Testing laboratories express this metric as a ratio of the standard deviation to the mean mass of the measured segments. Lower values indicate superior control over the fiber alignment process.
Precise calibration of the capacitance sensors prevents bias in the data collected from the output stage of the preparatory line. Strict adherence to these numerical standards dictates the commercial grade of the product and determines the downstream suitability for high speed weaving.