Moisture Mass Reconciliation Protocols in Recycled Paper Mill Furnish Audits
Auditing recycled furnish requires converting weighbridge gross mass to bone-dry fiber to prevent water inflation in CoC ledgers and commercial settlements.
Air Dry Tonnage
Commercial Mass
Standardized commercial weights for wood pulp and recycled fibre are calculated using a fixed moisture reference rather than raw shipping weight. This calculated value, known as air dry tonnage, represents the total dry mass of the material plus a nominal ten percent moisture content by convention. Since cellulose fibers are highly hygroscopic and exchange moisture with the atmosphere, raw weights fluctuate during transit and storage.
Converting these to a uniform dry weight equivalent prevents financial disputes between paper mills and pulp suppliers.
Standard Ratio
Measurements begin with the determination of the actual dryness percentage through laboratory testing or on-line sensors. Calculated from these readings, the air dry tonnage is determined by dividing the dry percentage by zero point nine zero and multiplying the result by the raw weight.
Transaction Adjustment
Discrepancies between billed and received weights can occur due to water loss or gain during long ocean voyages. The invoiced air dry tonnage remains the governing metric for the final trade settlement unless a joint survey by the contracting parties reveals a major deviation from the declared moisture profile. By ensuring that transactions are based on fiber mass rather than water content, this metric maintains consistency in global fiber procurement.