Chain of Custody Credit Allocation Ledger Audit Procedures
Verify credit allocation ledgers by auditing dock scale moisture corrections, empirical conversion yield factors, and the rolling 24-month expiration limit.
Gravemetric Scale Calibration
Scale Weighting
Precise balance adjustment on converting lines determines how filler loads settle within folding boxboard matrices. Gravemetric scale calibration establishes the reference mass for continuous web dosing units that meter mineral slurries onto moving paper surfaces. Coater heads rely on this weight verification to prevent thickness anomalies from reaching the dry end of a paper machine.
Sensor arrays measure load cell deflection under known reference masses to eliminate drift during long production campaigns. Thermal expansion inside the drying hall alters load cell outputs if operators fail to account for ambient temperature shifts before web feeding begins. Deviations beyond milligrams cause caliper variations that disrupt downstream creasing stations during carton conversion.
Target Drift
Load cell hysteresis degrades measuring accuracy over multi-week operating periods unless automated calibration cycles restore baseline sensitivity. Electronic signal amplification must match true mass input without introducing systematic bias into the dosing controller. Mill supervisors specify tight tolerances because excess coating weight wastes expensive calcium carbonate suspensions.
Insufficient mineral coverage leaves microscopic voids that reduce print fidelity on offset lithography presses. Corrective counterweights applied directly to the weighing platform verify linearity across the entire operating range of the gravimetric feeder.
Mass Verification
Gravimetric scale calibration ensures that every pallet of heavy linerboard meets strict grammage standards before leaving the finishing floor. Quality auditors compare indicated batch weights against certified reference standards to satisfy customer specifications for corrugated packaging strength. Plant engineers replace degraded strain gauges immediately when calibration residuals exceed acceptable mill thresholds.