Virgin and Recycled Fiber Ratio Auditing in Packaging Board Production
Paperboard fiber ratio auditing requires pairing ISO 9184 Graff C microscopic stain counts with EN 16995 chemical marker testing and mass-balance credit ledgers
Processing Yield Factor
Material Efficiency
Production ratios that measure the proportion of raw paperboard that is converted into finished packaging boxes define the yield of a manufacturing line. The processing yield factor is the multiplier used to estimate the total board requirement for a production run, accounting for all unavoidable waste from trim, set-up, and defective sheets. This factor allows production planners to calculate the exact tonnage of reels or sheets that must be ordered from the mill to deliver a specified quantity of boxes.
The calculation stops applying when there are changes in the box geometry or machine tooling, both of which alter the scrap rate.
Cost Calculation
Converting operations like printing, die-cutting, and gluing always generate some level of paperboard scrap. In processing yield factor calculations, this waste is modeled as a percentage of the total sheet weight, allowing planners to build the cost of the scrap into the final price of the boxes. This factor helps converters identify which production lines are generating excess waste, indicating the need for machine maintenance or adjustments.
Optimizing this yield reduces the environmental impact of the packaging.
Inventory Control
Accurate tracking of this yield factor prevents paperboard shortages that can delay shipment schedules. By maintaining a database of past run yields, converters can order the correct volume of paperboard from the mill. This control improves the factory’s cash flow and maximizes storage space.