Production Waste
Converting and printing operations generate non-salvageable substrate tonnage during the preliminary mechanical adjustments required to establish color balance and registration alignment. Measuring make-ready setup loss enables packaging plants to quantify the exact volume of paperboard consumed before a production run meets technical quality specifications. The loss includes defective sheets produced during ink key adjustments and impression roller settings.
This operational metric applies to flexographic and offset lithographic conversion lines, but excludes scrap generated during steady-state runs or post-converting finishing steps.
Press Calibration
Machine adjustments during setup consume paperboard tonnage as press operators align multiple ink stations and registration marks. Modern sheet-fed offset presses utilize automated color measurement systems to shorten calibration cycles and lower make-ready setup loss. Short production runs suffer a higher percentage of setup waste relative to total job volume than long production runs.
Converting plants reduce substrate waste by standardizing ink profiles and maintaining consistent board caliper across order lots.
Financial Recovery
Unrecoverable substrate consumed during machine setup directly impacts job profitability and raw material budgeting. High make-ready setup loss increases net unit cost, particularly when converting premium solid bleached board or specialized barrier-coated grades. Recycled paperboard mills reprocess setup waste as internal broke, recovering raw material value while forfeiting conversion costs.
Automatic print inspection systems and digital register controls shorten calibration times, reducing raw material consumption during press setup. Monitoring setup waste across shifts identifies mechanical wear in converting equipment and highlights training requirements for machine crews. Accurate calculation of setup scrap ensures precise raw material planning for complex packaging orders.
