Internal Differential
Physical measurement of moisture variation between the outer shell and inner center of compressed raw flax fiber blocks defines the moisture distribution profile across dense agricultural packages. A severe bale core moisture gradient develops when wet scutched flax is baled under high pressure without thermal equilibrium. Receiving laboratories at Chinese linen spinning mills log this measurement on raw material intake certificates to determine whether raw flax fiber lots comply with processing tolerances.
Where outer layers desiccate while the interior retains moisture, standard surface probe sampling fails to record true interior wetness.
Migration Mechanism
Divergence between surface readings and core readings stems from delayed ambient diffusion through high-density flax bales bound under hydraulic compression. Moisture migrates slowly toward the exterior during warehouse storage, creating concentrated wet pockets near the core that foster fungal growth during transit. When mill technicians breach the bale, damp core fibers exhibit lower tensile strength and uneven fiber separation during hackling.
Subsequent drafting and spinning steps experience increased end breaks if the interior moisture deviates significantly from equilibrium. Standard laboratory drying ovens quantify the variance by comparing core samples taken at five core depths.
Commercial Adjustment
Financial claims for short weight or fiber damage rely on verified moisture profiles established at point of entry. If a bale core moisture gradient exceeds contract thresholds, buyers apply weight corrections to prevent paying for water mass disguised as fiber. Settlement terms in international flax contracts specify that core measurements override exterior surface readings during arbitration.
