Pectin Dissolution Kinetics in Bast Fibre Wet Spinning Troughs
Trough temperature at 68°C accelerates pectin dissolution, lowering drafting force to stabilize wet-spun linen yarn counts up to Nm 60.
Uster Flaw Count
Imperfection Measurement
Electronic sensors analyze yarn running through a capacitive slot to detect thickness variations and neps per kilometer. The uster flaw count represents the standard metric used by spinners and weavers to grade the quality of linen yarns. Quality control officers record these counts in the Yarn Quality Certificate.
High numbers of imperfections indicate poor drafting or inadequate roving preparation.
Weaving Performance
Minimizing yarn defects is crucial for ensuring that high-speed weaving looms can operate without frequent stops due to warp yarn breakage. A high uster flaw count predicts a high frequency of loom stoppages, which reduces the productivity of the weaving mill. Weavers use this count to adjust their machine settings or to negotiate discounts on yarn shipments.
The test results are attached to the Spinning Lot Release Sheet to assure the buyer of yarn runnability. Every batch of spun yarn must stay below the agreed threshold of imperfections to prevent warp breaks on the loom, which would otherwise leave visible flaws in the finished woven fabric.
Fibre Distribution
Irregularities in the yarn often stem from poor fiber blending or variation in flax fiber length. Analyzing the uster flaw count helps the spinning mill adjust the gill box settings and draft ratios to achieve a more uniform fiber distribution. This monitoring keeps the yarn within the buyer’s tolerance limits.