Calculating Reclaimed Fiber Mass Balance under FSC Credit System Accounting
FSC credit accounting converts dry reclaimed furnish into claimable product by subtracting ash, moisture, and pulping rejects through dynamic yield factors.
EN ISO 2144
Combustion Protocol
Standardized incineration procedures establish the residue content of paper, board and pulps after exposure to controlled laboratory heating at 525 degrees Celsius. Chemical constituents derived from inorganic fillers, internal sizing agents and synthetic functional coatings resist oxidation at this threshold, whereas organic lignocellulosic fibers decompose entirely into gaseous combustion products. Compliance with en iso 2144 requires heating an oven-dry test specimen inside a regulated muffle furnace until complete carbonization occurs without thermal degradation of volatile mineral carbonates.
The standardized operational range excludes testing ash contents that decompose below this target temperature, leaving calcium carbonate intact while eliminating organic fiber solids.
Mineral Quantification
Ash determinations provide printers and packagers with verified measurements of internal mineral loading and surface blade coating proportions. Applying en iso 2144 yields a percentage calculation that relates the final mineral mass to the initial dry sheet weight. Precipitated calcium carbonate, talc, titanium dioxide and kaolin clay comprise the primary non-combustible elements measured through this gravimetric combustion regime.
Precise residue values allow mills to regulate opacity and sheet flatness without sacrificing burst resistance or tensile strength during high-speed converting runs. Sheet porosity rises and surface picking resistance falls when excessive ash substitution weakens the hydrogen bonding network between structural cellulose fibers.
Furnace Calibration
Controlled muffle furnaces prevent specimen entrainment during incineration by regulating airflow velocity across the crucible hearth. Specimens undergo moisture equilibration according to related conditioning norms prior to ignition, preventing draft disruptions caused by explosive moisture expansion within compressed fiber layers. Ash residues remain inside a desiccator through cooling cycles until analytical balances record stable final weights.