Determining Raw Flax Regain Mass for Dock Intake Reconciliation
Dock intake reconciliation converts landed gross weight to bone-dry mass via core oven desiccation before adding official twelve percent commercial regain.
Relative Humidity Sorption Curves
Equilibrium Model
Thermodynamic equilibrium charts plot the equilibrium moisture content of hygroscopic plant fibers against ambient atmospheric humidity levels at constant temperature. Environmental control systems in spinning mills utilize relative humidity sorption curves to adjust room humidification setpoints during flax fiber conditioning. Flax bast fibers display pronounced moisture hysteresis where absorption paths differ significantly from desorption paths.
Constructing accurate relative humidity sorption curves enables mill engineers to maintain optimal fiber flexibility and minimize static electricity during hackling and drafting. The validity of these curves assumes equilibrium conditions and does not predict transient moisture absorption rates during rapid environmental shifts.
Hysteresis Profile
Conditioning chambers expose clean flax samples to stepwise relative humidity increases from ten percent to ninety percent while monitoring sample mass changes. Desorption trials reverse this progression from saturation down to dry states. The resulting curves delineate two distinct equilibrium lines separated by a hysteresis gap characteristic of natural bast cellulose.
Conditioning Limit
Mill quality assurance specifications require raw fiber lots to attain specific moisture equilibrium points before mechanical processing begins. When relative humidity sorption curves show insufficient regain potential due to excessive heat drying during retting, technicians adjust conditioning exposure times. Quality records log environmental temperature and humidity levels alongside lot hysteresis profiles.
Proper environmental conditioning based on these curves ensures uniform yarn tenacity and prevents fiber brittle fracture during high-speed spinning.