Reconciliation Methods for Yield Loss and Moisture Distortion in Reclaimed Paper Ledgers
Reconciling reclaimed paper ledgers requires converting scale intake weights to bone-dry fiber mass using core probe testing per ISO 287.
Air-Dry Moisture Content
Equilibrium State
The standard measurement of moisture remaining in wood pulp or paper after it has reached equilibrium with the surrounding atmosphere under standardized laboratory conditions. In commercial transactions, air-dry moisture content defines the weight ratio where the material behaves as if it has reached a state of balance with normal air. This value establishes the basis for trade because raw fiber naturally absorbs or loses water depending on the environment.
The metric is defined as ninety parts of bone-dry fiber and ten parts of water.
Measurement Protocol
Laboratories determine the water ratio by drying samples in a heated chamber at one hundred and five degrees Celsius until the weight becomes constant. This measurement protocol allows mills to calculate the air-dry moisture content of massive commercial rolls by extrapolating from a series of small, sealed test pieces. The test requires rapid handling to ensure the specimen does not absorb atmospheric moisture before weighing.
Financial Valuation
Invoices are adjusted according to the deviation from the agreed standard percentage. Since water adds useless weight to a shipment, the buyer uses the calculated air-dry moisture content to compute the true fiber weight being purchased. This adjustment protects the purchasing organization from paying shipping fees for excess water.