Establishing Standard Mass Balance Scrap Tolerances across High Count Wet Spun Linen Runs
Fine count wet spun linen mass balance requires deducting 2.5 to 4.5 percent pectin dissolution loss and count-adjusted mechanical scrap from dry input mass.
Spinning Mass Conversion
Yarn Yield
Textile spinning calculations track the weight changes that occur as raw flax is drawn, combed and spun into finished yarn. In the spinning room, the spinning mass conversion measures the relationship between the weight of the incoming combed sliver and the weight of the wound yarn bobbins. This conversion calculation determines the physical efficiency of the spinning process.
Conversion Mechanism
Slivers are drawn out and twisted on the ring spinning frames, where moisture is added or lost depending on room conditions. This spinning mass conversion must account for the water absorbed during wet spinning and the subsequent drying stage. If the yarn is not dried to the correct moisture level, the calculated conversion rate will be inaccurate.
Technicians weigh the finished bobbins and compare their dry mass to the starting sliver mass. This comparison reveals if fibre is being lost as lint or fly during the twisting process.
Production Accounting
Factory managers use these mass conversion rates to monitor the productivity of individual spinning lines. The mill records these daily yield rates on the department board. High conversion rates show that the yarn is being spun with minimal breakages.
This tracing helps to control the cost of the finished linen yarn.