Substance Measurement
Wood pulp reaches a state of zero moisture content when heated in a drying oven until its weight remains constant. Calculating the bone-dry fiber mass provides the standard basis for determining the actual quantity of cellulose purchased in a commercial transaction. This value excludes all water and allows for an accurate comparison between different batches of raw material regardless of their shipping humidity.
Yield Calculation
Chemical pulp yields depend on the ratio of harvested wood to the final output of processed cellulose. Technicians use bone-dry fiber mass to assess the efficiency of the cooking and bleaching stages. If the moisture level in the incoming logs varies, the bone-dry fiber mass remains the only stable metric for managing chemical dosages and refining energy.
Commercial Settlement
Invoices for market pulp use the air-dry weight which assumes a theoretical ten percent moisture content. Converting this figure back to bone-dry fiber mass functions as a necessary step for mill managers when balancing the fiber budget. Because water adds significant weight but no structural value, the bone-dry fiber mass functions as the foundational unit for all recipe formulations in the stock preparation area.
Accurate determination of this mass prevents overpayment and ensures the consistent quality of the final paper grade.
