Standardized Visual Defect Classification Methods for Greige Cloth Inspection
Standardized greige inspection combines calibrated D65 illumination and 4-point scoring to convert visual cloth defects into precise commercial deductions.
Demerit Points Calculation
Grading Formula
Fabric inspection protocols convert raw visual defect counts into standardized numerical penalties per unit of surface area. Under the standard four-point system governed by ASTM D5463 or mill inspection standards, demerit points calculation assigns single penalty values from one to four based on the linear extent of yarn slubs, broken picks, holes, or oil stains found during continuous cloth examination. Individual penalties are summed over the roll length and normalized against one hundred square meters of examined fabric.
Calculation Procedure
Inspection technicians on the perch run finished linen bolts at controlled illumination, marking each detected anomaly on the digital tally console. A defect measuring under three inches earns one point, while faults extending beyond nine inches incur four penalty points on the cloth ledger. When multiple flaws appear in close proximity, the maximum penalty per single linear meter remains capped at four demerits.
The total point tally is multiplied by one hundred thousand and divided by the product of the inspected roll length in meters and the cuttable fabric width in centimeters.
Commercial Allocation
Mill clearance certificates record whether the calculated score satisfies buyer cut-and-sew thresholds for first-quality apparel linen. Exceeding thirty penalty points per one hundred square meters typically demotes the piece goods to second quality or requires commercial allowances on the invoice. Export shipments require formal perch logs attached to the bill of lading before customs clearance.