Calculating Vessel Payload Capacity from Master Greige Roll Weights
Calculate vessel payload capacity by adjusting greige roll weights for sizing loss, finish pick-up, moisture regain, and core tare volume constraints.
Viscose Moisture Absorption
Hygroscopic Property
A hygroscopic property quantifies the ability of regenerated cellulose fibres to take in water vapour from the surrounding air. High viscose moisture absorption results from the open molecular structure of the fibre, which allows water molecules to bond easily with hydroxyl groups. This characteristic makes the resulting fabric comfortable for apparel but susceptible to changes in strength when wet.
Industrial Performance
Fabric finishers must account for the swelling of the yarns when they are immersed in dye baths. Since viscose moisture absorption is higher than that of cotton, the drying times for these fabrics are typically longer and require more energy.
Dimensional Stability
As the fibres swell with water, the overall length and width of the fabric can change considerably. Excessive viscose moisture absorption during the dyeing process can lead to the formation of permanent creases if the fabric is not handled carefully. Mills use chemical resins to reduce the natural thirst of the fibre and improve its performance in humid climates.
Lab tests measure the weight of the fabric before and after exposure to high humidity to verify the effectiveness of these treatments. Finishing agents are applied to create a barrier that slows the rate of water entry into the polymer chain.
Liquid Distinction
Absorption of vapour is measured differently than the wicking of liquid water across a surface. While viscose moisture absorption is a molecular trait, the speed of liquid movement depends on the yarn twist and fabric weave.