Chain of Custody Credit Accounting Protocols for Packaging Board Mills
Mill credit accounting requires dry fiber mass balance calculations, yield factor adjustments for coating mass, and strict rolling credit ledger management.
Dry Fiber Yield
Material Recovery
Calculation of the percentage of usable cellulose material recovered from a pulping or recycling process is performed after all moisture has been removed. Measuring the dry fiber yield allows paper mills to determine the actual cost of their raw material inputs relative to the final weight of the paper produced. This value accounts for the loss of fillers, coatings and small fiber fragments known as fines during the washing and screening stages.
Process Control
Technicians calculate this figure by oven drying a sample of the incoming pulp to zero percent moisture and weighing it against the total input mass. Contaminants such as plastics, adhesives or ink particles are subtracted from the total to find the net usable fiber. In recycling operations, the type of waste paper heavily influences the final output.
High quantities of non-fibrous additives in the feedstock will result in a lower percentage of recovered material. This data guides the purchasing decisions of the mill by showing which grades of recovered paper provide the most value.
Economic Outcome
Optimizing this yield reduces the amount of waste sludge that must be handled and disposed of by the facility. It directly correlates with the environmental footprint of the production line.