Optical Binding
Fluorometric measurement of cell wall polymer binding provides a quantitative method for assessing the removal of non-cellulosic compounds from flax fibers during chemical processing. In wet-spinning mills, calcofluor white fluorometry provides a precise reading of residual beta-glucans and cellulose accessibility on the fiber surface. The measurement is recorded in the raw yarn preparation log to determine the consistency of the scouring process before drafting begins.
Signal Quantification
Dye intensity analysis measures the emission spectrum under ultraviolet excitation to identify localized variations in chemical penetration across different fiber bundles. This scan helps spinners adjust the chemical concentration in the next wet-processing batch. A uniform emission profile prevents downstream dyeing defects in the finished fabric, establishing a baseline that the buyer checks during final inspection.
Bleach Clearance
Standardized reflectance thresholds dictate whether a fiber lot is released for wet spinning or sent back for remedial scouring. In Chinese mills, the laboratory records this fluorometric value in the fiber preparation ledger as an essential quality control marker. The final clearance relies on matching the buyer’s criteria for uniform yarn absorption, ensuring that the yarn takes up dyes evenly without leaving undyed flecks in the finished linen.
If the reflectance deviates from the contractual baseline, the yarn undergoes secondary washing, which is documented in the bleach clearance certificate before dispatching the lot to the fabric production department.
