Barrier Paperboard Substrate Selection and Wet End Disintegration Yield Testing
Aqueous dispersion barrier boards outperform extruded polyolefins by delivering over 95 percent wet end fiber yield and avoiding heavy EPR penalties.
Fiber Accept Yield
Fibre Conversion
Calculating the total usable cellulose mass remaining after pulping losses and initial screening defines fiber accept yield. Mechanical and chemical pulping operations govern this metric by measuring usable dry weight against incoming raw wood mass. Pulp mills track this efficiency parameter to control digester cooking degrees and subsequent refining energy inputs.
Secondary fiber processing facilities calculate the same ratio to determine repulping efficiency and contaminant rejection rates. Processing boundaries end at the washer discharge before bleaching sequences begin.
Screening Efficiency
Reject separation stages remove uncooked wood bundles and mineral debris while retaining acceptable papermaking filaments. Slotted pressure screens operate under strict pressure differentials to separate oversized contaminants from conforming stock. Slot widths measure between zero point one and zero point three millimeters for hardwood grades.
Operators adjust rotor speed and dilution flows to maintain high accept ratios without carrying forward shives. Laboratory testing verifies that accept streams meet strict optical cleanliness standards prior to paper machine approach flows.
Yield Loss
Excessive refining intensity breaks individual cellulose strands and increases fines generation beyond acceptable drainage limits. High reject rates lower overall mill profitability by sending usable cellulosic material to landfill disposal streams. Refining machinery consumes substantial electrical energy while reducing average fiber length and lowering finished paper tear resistance.
Closed water loops accumulate dissolved organic substances when washing stages fail to remove residual black liquor effectively. Finished paper products experience severe stiffness reductions when incoming pulp furnishes lack proper structural integrity.