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.
Combed Cotton Regain
Moisture Equilibrium
A moisture equilibrium percentage defines the standard amount of water that combed cotton fibres retain when exposed to specific atmospheric conditions. Commercial transactions use combed cotton regain to adjust the weight of a shipment to its dry mass plus a standard allowance. This value usually sits around 8.5 percent under international textile standards.
Fibre Refinement
Combing removes short fibres and impurities, leaving long, aligned strands that respond uniformly to humidity. Because combed cotton regain is measured in a controlled lab environment, it provides a baseline for consistent pricing between mills and garment factories.
Environmental Correction
Raw weights fluctuate as bales or yarns absorb or release water in transit. Standard combed cotton regain allows parties to calculate the commercial weight regardless of the actual humidity at the point of delivery. A laboratory oven dries a sample to find its bone-dry mass before the standard percentage is reapplied for invoicing.
This process ensures that buyers do not pay for excess water absorbed during sea freight. Accurate calculations prevent financial losses caused by the natural hygroscopic nature of the cellulose.
Test Constraint
Finishes or coatings applied to the yarn can change the natural absorption capacity of the cellulose. While combed cotton regain is predictable for pure fibres, the presence of synthetic blends or hydrophobic treatments renders the standard percentage inapplicable.