Pass Order Decides Which Effects Remain Achievable
Pass order determines surface energy, registration accuracy, recyclability, and unit scrap rates across multi-step print converting runs.
Make-Ready Scrap Rate
Production Efficiency Metric
Setup waste calculations quantify the proportion of paper, board, or film substrate consumed during machine calibration before commercial-grade output begins. Calculated across printing presses, laminators, and die-cutters, the make-ready scrap rate expresses start-up material losses as a direct percentage of total substrate allocated for the production job. Technicians adjust color density, register crossmarks, set die cutting depth, and balance coating weights using preliminary running sheets.
Minimizing startup losses reduces raw material consumption, optimizes machine capacity, and controls per-unit packaging conversion costs. Accurate tracking separates routine startup consumption from steady-state operational waste generated during full-speed production runs.
Material Consumption Calculations
Total substrate mass or sheet count consumed during calibration is divided by total job input material to establish the setup scrap percentage. Multi-station offset presses, flexographic printing lines, and automated folder-gluers generate setup waste while operators align print plates, adjust ink duct sweeps, and calibrate creasing matrix channels. A typical six-color folding boxboard job running on an offset press consumes between two hundred and five hundred make-ready sheets to achieve targeted delta-E color tolerances.
Complex packaging conversions featuring cold foil, offline embossing, and rotary die-cutting accumulate additional setup waste across each successive converting unit. Automated camera registration systems and closed-loop spectrophotometers lower setup waste by reducing manual calibration time.
Metric Boundary Scope
Production losses caused by web breaks, ink contamination, or mechanical jams during full-speed commercial runs fall outside setup scrap metrics. Sheet trimmings, edge offcuts, and matrix stripping waste generated during normal steady-state die-cutting represent distinct process scrap categories. Setup scrap measurements exclude non-substrate consumables, including discarded wash-up solvents, ink plate wipes, and calibration chemistry.
Substrate damaged during warehouse transit, pallet unstrapping, or reel loading belongs to material handling damage classifications rather than conversion make-ready. The metric measures only the substrate consumed to achieve approved first-article proof standards before signing off on active production.