Four Point Inspection Procedures for Woven Linen Greige Cloth Quality Control
Standardized four-point greige inspection prevents downstream finishing losses by enforcing objective ASTM D5430 defect scoring before cloth conversion.
Pick Count per Centimeter
Structural Density
Weft yarn frequency measured along a fixed unit length of fabric defines the structural tightness of a linen construction. Quality control technicians determine pick count per centimeter using counting glasses on relaxed fabric sheets. The resulting figure dictates fabric weight, cover factor, and fluid permeability.
Measurement Protocol
Standard testing guidelines require placing the counting lens parallel to warp yarns while counting every individual pick over a ten-centimeter span. Operators take five separate readings across the drive side, center, and operator side of the fabric web to detect uneven take-up tension. Fabric relaxation after loom offloading causes weft compaction, so measurements taken immediately behind the reed differ from those taken after twenty-four hours of ambient conditioning.
Digital image analysis tools calculate average density automatically, eliminating human counting errors caused by fine yarn counts or complex structural patterns.
Contract Compliance
Buying contracts mandate target pick counts along with acceptable upper and lower percentage tolerances for every fabric specification. Deviations in pick count per centimeter alter fabric yield per kilogram of yarn, directly impacting mill manufacturing costs and final garment weight. Lower pick counts produce loose, unstable structures prone to seam slippage, whereas excess density increases stiffness and yarn consumption beyond budgeted targets.
Final inspection certificates record verified density values alongside warp counts to certify compliance before export billing.