Calculating Plain Linen Target Weight from Yarn Count
Target linen weight equals yarn tex multiplied by thread density, adjusted for warp size, crimp, wet process mass loss, and area shrinkage factors.
Bleaching Weight Loss
Alkaline Reduction
Chemical mass depletion occurs during the boiling stage of linen processing when hot sodium hydroxide solutions strip non-cellulosic impurities from the flax roving. Excessive alkali concentration accelerates degradation of the true cellulose skeleton, causing the measured bleaching weight loss to exceed standard tolerance limits specified in the mill operating manual. Commercial buyers reject yarn batches where this metric climbs past twelve percent because higher depletion degrades tensile strength beyond acceptable spinning thresholds.
Hydrogen Peroxide Loss
Subsequent oxidative bleaching removes residual lignin fragments trapped inside the pectin matrix through controlled decomposition reactions driven by stabilized oxygen species. Peroxide bath temperatures maintained above ninety degrees Celsius drive rapid radical formation that attacks both coloring bodies and vulnerable carbohydrate chains simultaneously. Laboratory technicians calculate this secondary bleaching weight loss by drying sampled hanks before and after the peroxide treatment cycle to establish exact dry matter ratios.
Export Tolerance
Mill acceptance contracts define maximum permissible mass reduction across combined scouring and bleaching procedures to protect fabric durability during downstream weaving operations. Variations between the processing standard and the buyer acceptance criteria trigger commercial disputes whenever chemical over-treatment leaves yarns too fragile for high-speed industrial looms. Finished grey cloth specifications require strict adherence to these depletion limits because excessive mass loss destroys the natural handfeel expected in premium linen textiles.