Moisture Equilibrium
Physical behavior of water molecules held within the cellulosic capillaries of plant stems determines how heat energy transfers during the drying of processed flax. These energy-driven phase changes are studied through bast fibre thermodynamics, which models the relationship between latent heat and bound water desorption in industrial linen mills. When wet linen packages are dried, the thermal energy required to remove water increases as the remaining moisture content falls.
Industrial Impact
Energy profiles during the industrial drying stage are calculated to prevent thermal degradation of the cellulose. If the temperature exceeds eighty degrees Celsius, the fibre loses its natural moisture and becomes brittle. To maintain tensile strength, mills must control the drying rate by monitoring the heat flux through the linen package.
Process Boundary
The mathematical equations that govern this heat transfer cease to be accurate once the free water is entirely evaporated and only chemically bound moisture remains. At this dry point, further heating does not remove water but instead begins to scorch the flax. Consequently, temperature sensors are placed at the exhaust vents to trigger an automatic shutdown of the drying chamber before the fibre temperature reaches critical levels, safeguarding the physical integrity of the natural material and ensuring the spun yarn retains its spin-ready elasticity.
