Rapier against Air-Jet Sheds for Wet-Spun Linen Warps
Positive rapier insertion handles low-elongation wet-spun linen warps reliably, while air-jets trigger high stop rates, pneumatic costs, and greige faults.
Start Mark Defect
Visual Irregularity
Optical interference patterns appearing during the final inspection of woven flax fabric are documented within the mill export dossier as a start mark defect. Operators grading finished linen cloth examine the material against backlit inspection boards to record warp tension anomalies resulting from loom restart sequences. Such blemishes lower the classification of a bolt from export standard down to domestic utility grade.
Mechanical Cause
Abrupt deceleration during previous shifts creates uneven yarn elongation across the reed before the shuttle resumes standard operation. Tension regulators lose calibration whenever power fluctuations interrupt the driving motor during pneumatic loom cycles. Technicians adjust pneumatic pressure valves on the take-up roller to prevent recurring tension spikes that damage sensitive natural fibres.
Acceptance Threshold
European buyers reject shipments carrying more than two visible density variations per hundred linear metres of finished linen goods. Mill quality supervisors apply internal tolerances that permit minor irregularities within utility grades while maintaining strict zero tolerance parameters for premium fashion orders. Commercial contracts stipulate financial penalties whenever delivery lots fail the agreed density verification protocol during independent pre-shipment laboratory audits.