Process Description
Secondary thermal procedure removes moisture from textile specimens by heating them at a specific temperature until mass no longer changes. During the test, constant temperature drying occurs within an oven set to roughly 105 degrees Celsius to strip all unbound water molecules. This stage allows for the exact calculation of commercial regains and bone dry weights in raw materials.
Thermal Regulation
Precise airflow and heating elements keep the internal chamber within a narrow range of plus or minus two degrees. When constant temperature drying starts, moisture leaves the surface of the fibre first before the deeper core water migrates outward through the polymer structure.
Temporal Requirement
Material stays inside the chamber until consecutive weighings show a variation of less than zero point one percent of the specimen mass. This specific constant temperature drying sequence avoids the risk of fibre degradation that would occur at higher or unmonitored heats. It creates a stable starting point for subsequent chemical analysis or fibre identification tests.
Operators record the precise time of departure from the heat source to minimize ambient reabsorption before the final scale measurement is taken.
Measurement Accuracy
Verification happens by transferring the specimen quickly to a desiccator before it reaches the scale. Regular constant temperature drying protocols define the moisture content for a whole mill lot.
