Standard Regain Calculation Procedures for Scutched Flax Fibre
Standard regain for scutched flax fibre is 12.00 percent, used to convert lab oven-dry mass into binding commercial invoice mass under ISO 6741.
Desiccator Cooling Protocol
Laboratory Procedure
Standardized laboratory methods dictate the precise steps required to cool hot, oven-dried flax specimens in a sealed environment before weighing. Adhering to a desiccator cooling protocol prevents the specimen from absorbing moisture from the surrounding air during the transition from the drying oven to the analytical balance. In Chinese spinning mills, technicians execute this step when assessing the commercial weight of imported or domestic flax fiber.
The laboratory logging sheet records the starting and ending times of this stage alongside the measured atmospheric relative humidity.
Thermal Stabilization
Achieving thermal equilibrium between the sample and the balance chamber is the primary physical objective of this method. If a mill technician weighs a sample that is still warm, upward convection currents within the balance enclosure will artificially reduce the measured mass on the digital display. Air currents of this type can lead to an incorrect calculation of the clean dry fiber weight.
This imbalance skewing can compromise the subsequent commercial yield calculations. For this reason, the dried flax must rest within the sealed desiccator, in the presence of active silica gel, for a minimum duration of thirty minutes to ensure complete temperature equalization.
Weighing Schedule
Verification of dry fiber mass occurs immediately upon completion of the timed resting phase.