Evaluating Linear Density Uniformity in Wet Spun Flax Sliver Lots
Evaluating wet-spun flax sliver linear density requires combining ten-metre cut-and-weigh gravimetric tests with conditioned capacitance spectrogram analysis.
ISO 1973 Cut and Weigh
Test Method
Gravimetric determination of fiber mass per unit length defines the standard laboratory protocol for evaluating textile fiber linear density. Technicians execute the ISO 1973 cut and weigh procedure by measuring pre-cut bundles of parallel fibers on microanalytical balances. This standardized method applies to raw flax fibers, bleached flax strands, and synthetic staple fibers used in linen blends.
Measurement Procedure
Conditioned fiber bundles are aligned under specified tension and cut to precise lengths using a double-bladed cutter fixture. Operatives count the exact number of individual cut fibers within the bundle to establish the total sample length. A calibrated balance measures the collective mass of the cut fibers to a precision of zero point zero zero one milligrams.
Atmospheric conditioning at standard room temperature and relative humidity stabilizes fiber moisture prior to mass measurement.
Density Calculation
Dividing total sample mass by total combined length yields the mean linear density expressed in decitex. Commercial testing reports state mean values and coefficients of variation across multiple test replicates to confirm lot uniformity. Export documentation relies on this standardized measurement to verify that raw material shipments meet contract specifications for spinning mills.
Precision measurements obtained through this procedure validate fiber fineness grades prior to high-speed yarn spinning.