Reconciling Wet Spinning Yield Loss in Mass Balance Auditing
Reconciling wet spinning yield loss requires adjusting raw fiber weights for 12% regain, deducting 3.2-5.8% pectin extraction loss, and verifying comber tow sales.
Comber Tow Accounting
Recovery Metric
Quantitative fibre tracking systems in yarn spinning facilities measure the mass fraction of short fibres extracted during mechanical combing. Within Chinese wet spinning mills, comber tow accounting records the precise weight of short flax fibres separated from long line sliver to maintain continuous batch yield records. The measurement applies to carded and combed flax lines before roving preparation.
It ceases to apply once short fibre fractions enter byproduct baling streams for secondary coarse yarn production.
Process Ledger
Combing machines separate coarse and short fibres from long flax strands to achieve required yarn uniformity and tensile strength. Under standardized comber tow accounting, mill technicians record raw sliver input against combed sliver output and tow waste weight at every shift change. A typical combing pass processing one hundred kilograms of long line flax sliver yields approximately eighteen kilograms of comber tow, leaving eighty-two kilograms of combed line sliver.
Shift logs document these mass transfers to detect mechanical wear in comb clothing and pin strips before sliver unevenness exceeds tolerance limits. High tow extraction rates indicate excessive fibre breakage or incorrect comb settings, raising overall raw material costs per kilogram of fine spun yarn. Daily ledger summaries reconcile total tow production with raw flax consumption figures across spinning lines.
Allocation Model
Financial accounting standards require accurate cost assignment between main line flax yarns and secondary coarse tow yarns. Through systematic comber tow accounting, raw material purchase costs are proportionally distributed between high-count long line yarn and low-count tow byproduct yarn. Comber tow carries a lower commercial value per kilogram than long line sliver, requiring price adjustments in inventory valuation systems.
Mill managers rely on these mass balance allocations to establish realistic production margins for blended and pure linen products. Accurate valuation prevents distorted profitability calculations in downstream weaving and export transactions.