Standard Laboratory Moisture Regain Corrections for Raw Cotton and Cellulosic Fibres
Commercial moisture regain corrections adjust oven-dry cellulosic fibre mass using statutory allowances to prevent buyers paying pure water rates on dry matter.
Modal
Regenerated Cellulose
Modified viscose processing yields a regenerated cellulose fibre with higher wet strength and a higher modulus of elasticity. Modal offers greater dimensional stability than standard viscose, making it less prone to shrinkage or deformation when laundered. The production involves a specific precipitation bath that allows for a higher degree of polymerization and better orientation of the molecular chains.
Structural Strength
Spinning speeds and tension controls during extrusion determine the final tenacity of the filament. Because modal is made primarily from beechwood or spruce pulp, it retains a soft hand feel while resisting the pilling common in other cellulosics. Manufacturers specify this fibre for lightweight knits and intimate apparel.
Wet Performance
Resistance to swelling in water allows the fabric to maintain its shape during the wet processing stages of dyeing and finishing. When modal is compared to regular rayon, the difference in wet modulus is substantial enough to prevent the fabric from becoming stiff when wet. This property ensures the finished garment remains supple after multiple wash cycles.
Dyeing Behavior
Absorption rates for reactive dyes remain high, which leads to deep and vibrant colours with excellent wash fastness. The smooth surface of modal reflects light more uniformly than cotton. This results in a subtle sheen that persists throughout the life of the textile.