Auditing Mass Balance Discrepancies in High Guard Hair Camel and Cashmere Batch Processing
Auditing mass balance in camel and cashmere dehairing requires converting all stream weights to oven-dry mass plus stream-specific standard regain.
Medullation Volume Correction
Geometric Adjustment
Analytical adjustment of measured fibre diameter values accounts for the hollow internal air channels present in coarse animal wools and hairs. Accurate medullation volume correction adjusts the raw measurement results to prevent overestimating the actual weight and density of the fibre batch. Because medullated fibres contain empty central tubes, their apparent volume is greater than their actual solid keratin mass.
This correction allows manufacturers to calculate yarn yields and dye uptake more precisely, preventing costly errors during wet processing.
Density Variation
Hollow wool fibres have a lower density than fully solid wool fibres, which affects weight-volume relationships. If a mill calculates the expected yarn weight using uncorrected diameter measurements, the resulting yarn will be lighter and bulkier than calculated. The correction factor uses the percentage of medullated fibres and their internal channel diameters to recalculate the true material density.
This calculation ensures that blending ratios and yarn counts remain accurate.
Measurement Error
Optical projection and air-flow measurement methods can be skewed by the presence of hollow centres in the fibres. Projection microscopes measure the outer boundary of the fibre, which does not show the hollow core. If these uncorrected values are used, the resulting fabric can turn out too stiff or light.
The correction factor modifies the values to match the true solid volume of the wool.
Yarn Performance
Correcting these volume measurements helps spinners adjust their machinery settings for wools from different sheep breeds. Wools with high medullation require different twisting and spinning forces to produce strong yarns. This correction helps predict the spinning performance of the raw stock.