Mass Balance Arithmetic and Yield Loss Factors in Fiber Ledgers
Applying uncorrected gross weights or inflated yield factors into mass balance ledgers creates over-allocated credit accounts that trigger customs seizures.
Mineral Coating Deduction
Mass Correction
A calculation method that subtracts the weight of non-fibrous coating materials from the total weight of a paperboard sample ensures that the true cellulose fibre content is accurately recorded. Applying a mineral coating deduction is standard practice when assessing paperboard for recycling yields and resource efficiency. This adjustment prevents clay, calcium carbonate, talc and other inorganic pigments from being miscounted as usable paper fibre.
Fibre Assessment
Inorganic coatings often make up to thirty percent of the total mass of high-quality printing boards and folding boxboards. Since these minerals cannot be turned into new cellulose fibres during the recycling process, they must be discounted to evaluate the material value correctly. Chemical analysis and ash tests are used to determine the exact proportion of inorganic material in the coating layer.
The calculated weight is then removed from the total mass of the received consignment, which ensures that payment is made only for the actual fibre content.
Yield Adjustment
Process engineers rely on this correction to predict the yield of deinking and pulping plants. High levels of coating minerals can increase sludge volume and dewatering costs, creating a processing burden. Accurate adjustment values help mills balance their raw material budgets and plan their waste disposal strategies.