Moisture Equilibration
The physical properties and weight of flax fibers are highly dependent on the moisture they absorb from the surrounding atmosphere. The iso 139 gravimetric test establishes a method for determining moisture regain by weighing samples before and after conditioning in a standardized environment. Technicians dry the yarn or fabric to a dry state and then weigh it at regular intervals until a constant mass is achieved in the standard atmosphere.
This procedure ensures that commercial weight calculations are accurate and fair.
Commercial Valuation
Flax fibers are sold by weight, so variations in moisture content can lead to significant financial discrepancies between spinner and buyer. Utilizing the iso 139 gravimetric test during quality audits prevents disputes over moisture content by providing an objective measure of fiber mass. Mill laboratories record these results in the certificate of analysis that accompanies each shipment.
Accurate moisture measurements are necessary to verify that the material is within the agreed commercial limits.
Process Impact
Fiber pliability and spinning performance are directly affected by the moisture content of the raw flax. Correctly conditioned flax behaves predictably during drafting and spinning, which reduces yarn hairiness. Moisture testing protects the yarn from being spun while it is too dry or too damp.
