Determining Moisture Regain Corrections for Cotton Yarn Density
Correcting cotton yarn density for moisture regain standardizes commercial invoiced mass and prevents package dyeing defects caused by swelling.
Cotton Yarn Count
Fineness Standard
Numerical expression of the fineness or coarseness of a spun cellulose thread. Traders and knitters use cotton yarn count to specify the diameter of the raw material before it enters the machine. Higher numbers in the indirect system indicate a finer yarn suitable for lightweight apparel.
English Measurement
The indirect system most commonly used in the industry defines cotton yarn count as the number of 840-yard hanks that weigh exactly one pound. Mills calculate this by weighing a measured length of yarn on a precise balance and applying the standard formula. A count of 30s means thirty hanks of 840 yards each are required to reach the pound unit.
Spinning Specification
Spinners adjust the draft settings of a ring frame or rotor machine to achieve a targeted cotton yarn count for a specific order. Variations in the moisture content of the fibre or the tension of the winding process cause deviations in the final result. Precise monitoring prevents barre effects in knitted fabrics or unevenness in woven structures.
Count Variation
Testing laboratories measure the cotton yarn count of incoming shipments to verify compliance with the buyer’s tolerance limits. A substantial deviation from the nominal count affects the fabric weight and the consumption of dye.