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.
Hysteresis Effect
Moisture Retardation
Physical differences in moisture absorption during wetting and drying cycles create a lag in fabric weight stabilization. The hysteresis effect describes why a textile fibre contains less moisture when absorbing water from a dry state than when drying from a wet state at the same relative humidity.
Testing Environment
Conditioning laboratories must pre-dry textile samples below standard humidity levels before starting the acclimatization process. This step ensures that all samples approach equilibrium from the same direction, eliminating the hysteresis effect from the final weight measurements. Standard testing procedures usually start from a dry baseline of under ten percent relative humidity to achieve consistent and reproducible results across different testing sites.
Industrial Process
Mill operators who measure yarn weights during spinning must account for these distinct drying curves. The same package of cotton can weigh differently depending on whether it has been dried down to ten percent moisture or allowed to absorb up to that same level from a bone-dry state.
Quality Control
Commercial contracts for raw cotton or wool include specifications that mandate precise conditioning paths. This protocol prevents artificial weight inflation caused by testing moist fibres that have not been properly pre-conditioned. Accurate weight determinations protect the buyer from paying for excess bound moisture.