Recovered Paper Yield Estimate Using Laboratory and Mill Accounting Data, 2007 TAPPI 8th Research Forum on Recycling

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Yield is an important process parameter with serious economic and environmental consequences. Precise calculation of yield is not easy. Mills use various approaches to estimate yield. The objective of this paper is to compare the yield for each furnish component with adjustment for actual process losses by combining paper machine product data, monthly mill accounting data, and data for each furnish component. Laboratory data for % moisture, 6 cut rejects, solubles, fines + ash are included in an example for a furnish of Newsprint, Sorted White Ledger, Coated Book, wet lap DIP, and mill broke. The model can be expanded to assign bleach chemicals and residue disposal tons to the appropriate furnish component. Tracking yield results will help identify economically and environmentally attractive furnish components for the mill.