Reconciling Scouring Mass Loss and Wet Contraction in Landed Linen Fabric Costing
Landed linen costing requires dividing greige linear price by the net length yield factor while netting out chemical scouring mass loss from gross roll weight.
Length Yield Factor
Fibre Utilization
A length yield factor represents the mathematical ratio between the actual length of finished linen yarn produced and the theoretical maximum length derived from the raw flax input weight. Mill engineers monitor the length yield factor to quantify conversion efficiency during the spinning process. High values indicate effective reduction of waste during drafting, whereas low figures signal excessive loss of shorter fibres as noils.
The calculation accounts for moisture regain standards to ensure comparability across disparate production batches. This conversion metric excludes mechanical downtime or energy variables while focusing strictly on the transformation of mass into continuous textile strands.
Spinning Measurement
Production staff determine this value after combing and carding stages when fibres move to the spinning frame. Technicians weigh the input sliver and measure the output yarn footage to establish the baseline performance per kilogram of raw material. If the machinery settings create uneven tension, the draft ratio shifts and produces inconsistent counts.
Every adjustment to the flyer speed or roller pressure alters the final tally recorded in the mill logbook. Buyers demand these data points to verify that specific fibre grades meet contractual obligations for yield consistency across heavy and light fabric orders. Consistent outputs allow mills to adjust pricing structures based on reliable projections of total output length per bale of sourced flax.
Precise monitoring detects slippage within the gear train before significant material wastage accumulates on the factory floor.
Acceptance Boundary
Quality assurance teams set upper limits for the length yield factor during final contract negotiations to prevent inferior fibre substitution. Exceeding the standard often points to over-stretching of individual strands, which compromises the structural integrity of the resulting textile under load. Conversely, falling beneath the limit suggests either high impurity levels within the batch or a failure of the mechanical drafting process to maintain uniformity.
Mill managers treat these targets as final parameters for assessing the viability of every spinning run. The recorded figure functions as a fixed constraint for all subsequent weaving operations.