Moisture Ratio
Liquid retention capacity dictates how thoroughly flax roving absorbs applied sizing agents during the padding stage of wet spinning preparation. Wet pick-up percentage measures the proportion of retained liquor relative to the dry mass of the bast fibre assembly immediately following the squeeze rolls. Technicians calculate this metric by weighing the saturated material, extracting residual liquid through oven drying, and dividing the mass differential by the bone-dry weight.
Chinese mills record these values on the production routing sheet accompanying each cart of roving transferred from the immersion bath to the drying cylinders.
Liquor Absorption
Excess sizing liquid compromises subsequent drafting performance by causing fibre entanglement and erratic drawing tension on the frame. High absorption rates point toward worn pneumatic pressure cylinders on the squeeze nip, whereas low retention produces brittle roving susceptible to breakage during high speed attenuation. Production managers monitor this parameter continuously to maintain yarn regularity across long runs of linen yarn destined for domestic weaving sheds.
Export Compliance
Overseas buyers specify exact moisture retention limits within purchase contracts to prevent mildew growth during maritime transit from eastern ports. Quality inspectors verify compliance by sampling dried hanks at the final packing bench before issuing the lot release certificate required for customs clearance. Shipments exceeding agreed retention thresholds face immediate rejection at the warehouse dock due to biological degradation risks during humid transport cycles.
