Hackling Yield Arithmetic between a Bale and a Finished Metre
Landed linen metre cost depends primarily on hackling line yield, where each percentage loss in combed sliver inflates yarn preparation costs down the loom.
De-Sizing Mass Loss
Removal Measurement
Gravimetric determination of weight reduction following enzymatic or chemical washing quantifies the precise removal of protective warp sizing compounds from woven grey cloth. This percentage weight decrease, calculated as de-sizing mass loss, verifies that starch or synthetic binding agents applied during weaving preparation have been eliminated prior to bleaching and dyeing. Incomplete removal leaves chemical barriers that prevent uniform dye absorption and produce streakiness in finished linen fabrics.
Finishing plant quality control laboratories log this parameter on batch processing sheets after oven-drying fabric specimens before and after washing steps.
Analytical Procedure
Standard laboratory testing requires bone-drying woven specimens at one hundred five degrees Celsius to establish initial oven-dry mass before chemical extraction. Enzymatic bath treatments break down starch polymers into soluble sugars, which are rinsed away with hot water cascades. A secondary drying cycle determines the final dry mass, allowing technicians to calculate the lost weight fraction relative to the unwashed grey state.
Target values typically range between three percent and eight percent of grey fabric weight, depending on the original size formula.
Technical Limitation
Aggressive enzymatic or alkaline boiling removes natural flax waxes and pectins alongside synthetic sizing materials. Overestimating size removal occurs when non-starch fiber components dissolve during severe bath conditions. Finishing managers calibrate bath temperatures and immersion times to prevent cellulose fiber degradation while achieving full size removal.