Moisture Determination
Absolute water content calculation establishes the baseline mass for raw flax fibres during initial mill intake. ISO 6741-1 Gravimetric Drying defines the procedure for measuring volatile mass loss by thermal elimination, separating dry cellulosic substance from entrained liquid before spinning preparation. Thermal cabinets operate at a controlled temperature range to drive off moisture without pyrolyzing organic constituents.
Duplicate specimens undergo weighing cycles until mass stabilization confirms complete water removal. Analytical balances record mass differentials with high precision to calculate exact percentage values.
Acceptance Protocol
Commercial transactions for unspun flax stock depend on dry mass adjustments to prevent buyers from paying for excess water weight. Commercial laboratories apply the standard to core samples drawn from bales arriving at the spinning facility. Exceeding agreed moisture limits triggers contractual price deductions or shipment rejection prior to drafting yarn.
Mill accountants reconcile raw purchase invoices against dried mass certificates issued by certified testing authorities.
Thermal Calibration
Temperature fluctuations inside convection ovens compromise drying accuracy and distort moisture percentages. Technicians verify heating chamber uniformity using traceable calibration sensors placed at specific interior points. Air circulation velocity must remain constant to prevent localized thermal pockets from altering evaporation rates.
Exhaust venting removes liberated water vapor efficiently to maintain low humidity within the drying environment.
