Standard Cut Length Gravimetric Methods for Line Flax Linear Density Testing
Standard cut length gravimetric testing uses strict pretensioning, razor sectioning, and moisture regain corrections to establish spinnable tex accurately.
Coefficient of Variation Tex
Statistical Variance
Distribution of mass along a specific length of thread describes the uniformity of the spinning output. Calculation of the coefficient of variation tex identifies the degree of irregularity within a lot of finished linen yarn. Low values indicate a smooth surface suitable for high-end shirting.
High values suggest a slubby texture that might cause problems during the weaving phase.
Mill Performance
Laboratory technicians in Chinese spinning facilities monitor this figure to detect wear in the drafting rollers or spindles. If the coefficient of variation tex rises above a predetermined threshold, the maintenance team must inspect the apron pressure and the alignment of the gear train. Consistent monitoring prevents the production of yarn that would fail the visual inspection for streaks in the dyed fabric.
Quality Threshold
Yarn that demonstrates erratic density leads to uneven tension on the loom beam. The coefficient of variation tex dictates whether a batch is sold as prime grade or discounted as secondary material. It is measured using an electronic capacitance tester that scans the material at high velocity.
This statistical tool ceases to be useful for extremely short fibres where the overlap of ends creates inherent noise in the data. Detailed analysis of these spikes allows the mill to isolate the exact spindle responsible for the defect.