Standard Regain Calculations in Cellulosic Fiber Analysis
Adjust clean oven-dry mass using official commercial regain percentages to ensure accurate tariff classification and prevent commercial mass invoicing errors.
Lyocell Regain
Moisture Equivalence
Standardized percentage of water that dry regenerated cellulose fibre absorbs from the surrounding air under controlled temperature and humidity conditions defines its hygroscopic nature. Textile laboratories evaluate lyocell regain to calculate the correct commercial weight of shipments and to predict fabric behavior during dyeing. This value is officially established at eleven point five percent under standard conditions of sixty-five percent relative humidity and twenty degrees Celsius.
It distinguishes the material from other cellulosic fibres like cotton or viscose which have different absorption profiles, ensuring accurate quality comparisons in material sourcing.
Textile Performance
High moisture absorption contributes significantly to the wear comfort and breathability of the finished garment. Because of the specific lyocell regain, fabrics made from this fibre feel cool and dry against the skin by quickly absorbing and dissipating sweat. This property also reduces static electricity build-up during processing and daily wear.
It makes the yarn highly suitable for sportswear and activewear applications.
Commercial Weight
Buyers and sellers use the standardized moisture values to calculate the dry weight plus the allowed moisture allowance for trade settlements. The lyocell regain is the basis for adjusting the invoiced weight of raw fibre bales or spun yarns. If the actual moisture exceeds the standard, the transaction weight is adjusted downward to avoid paying for excess water.
This practice prevents disputes over weight variations caused by different transport conditions.
Processing Behavior
Fibres swell when they absorb moisture, which changes the diameter of the yarn and the density of the woven fabric. During wet processing, lyocell regain affects dye uptake and the penetration of finishing chemicals into the fibre core. Wet fibres are more susceptible to fibrillation, where micro-fibres peel off the yarn surface.
Managing this swelling is a critical task for fabric dyers and finishers.