Optical Gloss Index
Speculative light reflection designates the surface luminance ratio measured across finished linen cloth under standard illumination angles. This property governs visual grading protocols during the final inspection stage of Chinese mill production, where inspectors verify whether woven surfaces meet commercial brightness thresholds. Application of the metric stops at grey cloth evaluation because raw yarn lacks the smooth parallel lustre required for optical capture.
Mill acceptance standards differ from buyer purchase tolerances by three percentage points.
Inspection Register
Verification equipment directs a calibrated tungsten beam against the dyed textile web at a forty five degree incidence angle. Photometric cells capture the returning glare while the fabric moves continuously through the finishing line. Values register automatically on the lot sheet alongside tensile strength scores and density metrics.
Higher readings point to excessive calendering pressure during pressing, which flattens natural bast fibres into artificial mirrors. Lower numbers indicate incomplete pectin removal during boiling, leaving residual starches that scatter photons diffusely.
Trade Variance
Buyers reject shipments falling outside agreed boundaries because anomalous gloss signals defective finishing that fades unevenly after laundering. Mills maintain internal calibration logs to prevent disputes over delivery specifications before export containers leave the warehouse. Discrepancies between laboratory readings and warehouse audits stem from humidity shifts during transit.
Measurement uncertainty decreases when relative humidity remains stable inside the packing facility.