Fibre Accounting
Mechanical pulp mills and recovered paper sorting facilities employ raw material yield optimization to balance dry fibre output against wet incoming weight. Moisture variation across incoming bales introduces density errors that distort stock preparation. Defribratory loss calculations track rejects during secondary screening to isolate true cellulose recovery from water weight.
Gravimetric variance tolerance on a continuous paper machine sits near zero point five percent before basis weight control loops compensate. Residual moisture management prevents financial loss from paying for freight water instead of bone dry mass.
Conversion Efficiency
Die cutting waste and web trim loss dictate the financial margin of corrugated box plants and folding carton converters. Raw material yield optimization measures the square metre area of finished blanks against parent roll consumption. Slitter knife wear increases edge dust generation, which narrows usable web width and raises reject frequency.
Board stiffness specifications demand precise tension control during unwinding to prevent elongation that ruins register during multi pass printing. Caliper reduction initiatives lower grammage while preserving burst strength through mechanical refining intensity rather than sheer mass.
Stock Valuation
Procurement contracts for recycled linerboard tie unit pricing directly to moisture content and contamination thresholds. Raw material yield optimization determines the net payable tonnage by discounting mineral filler and adhesive residue from gross delivery weights. Pulper reject disposal costs scale with the volume of non repulpable laminates and wet strength resins present in mixed office waste.
Laboratory testing of ash content verifies that inorganic load stays beneath contractual limits to protect downstream drainage rates. Total cost calculations incorporate both purchase price and conversion wastage to establish true material economy per thousand impressions.
