Yarn Count and Evenness Checks before a Cone Lot Ships
Verify conditioned skein count, capacitive CVm evenness, and cone hardness against ISO tolerances to stop defective flax yarn before freight release.
Neps
Fibre Irregularity
Unintended entanglement forms knots during carding when loose flax filaments twist upon themselves before drafting takes place. Mechanical cleaning removes most natural debris yet leaves small circular imperfections behind in the sliver. Mill inspectors grade raw stock batches by counting these knots per hundred grams under standardized overhead illumination.
Buyer agreements specify strict acceptance limits for the final yarn to prevent bumps from disrupting subsequent warp tension on power looms.
Yarn Quality
Dense agglomerations alter linear density profiles along spun linen threads. Laboratory testers measure mass variation continuously through capacitive sensors while pulling the strand through a narrow measuring slot. Small imperfections register as distinct voltage spikes that operators record on official inspection certificates before export packaging begins.
Exceeding contracted defect thresholds triggers financial penalties for the spinning plant because uneven yarn creates visible blemishes in dyed cloth.
Fabric Defect
Random surface knots emerge after finishing when trapped fibre lumps resist chemical bleaching and dye uptake. Finished linen cloth displays pale or dark spots wherever localized density prevents proper liquid penetration during wet processing. Quality controllers inspect finished bolts visually against a backlit table to classify pieces into export grades based on surface uniformity.
Export contracts allow minimal spot density per square metre for luxury garments whereas industrial upholstery stock permits higher tolerance levels.
Determination of Wet Spun Flax Yarn Linear Density and Mechanical Properties
Wet spun flax linear density and mechanical properties depend on strict moisture regain control, hot water pectin drafting, and CRE tensile evaluation.