Regenerated Cellulose
The high capacity of regenerated cellulose fibres to absorb water from the surrounding atmosphere dictates the physical behavior and weight of the textile. This viscose rayon regain is much higher than that of natural cotton, averaging around eleven percent under standard test conditions. Understanding this value is necessary for predicting how the fabric will shrink, stretch and absorb dyes, which prevents defects in the finished garments.
Processing Influence
Mechanical and chemical finishing processes can alter the amorphous and crystalline regions of the cellulose polymer. These alterations change the viscose rayon regain, as a more crystalline structure has fewer sites available for water molecules to bind. Mill engineers must monitor these changes to ensure that the finished fabric maintains its intended weight and drape.
Weight Calculation
Raw materials sold by weight must be corrected to a standard moisture level to ensure fair pricing. Determining the viscose rayon regain of a shipment involves drying representative samples to a bone-dry state and calculating the water weight. This prevents buyers from paying for excess water introduced during maritime shipping or storage in humid warehouses.
Financial Impact
Small deviations from the standard moisture percentage can translate into large financial adjustments for high-volume yarn transactions. If the actual viscose rayon regain exceeds the agreed commercial standard, the invoice must be adjusted downward to compensate for the water weight. This correction protects the profit margins of both the spinner and the garment manufacturer.
