Paperboard Yield Arithmetic

Converting Loss

The arithmetic must account for several types of material loss that occur during the printing, die-cutting and gluing processes. Some board is lost during press setup and make-ready, while more is trimmed from the edges of the sheet to ensure correct alignment. In addition, the shape of the carton blanks leaves skeletal waste on the die-cutter, which must be collected and sent for recycling.

By applying the paperboard yield arithmetic, the converter can calculate the exact percentage of raw material that will end up in the finished box. This calculation is necessary to avoid running short of material during a production run. It also helps in pricing the job accurately for the customer.

Modern planning software automates this calculation by integrating the carton design directly with the sheet layout, which minimizes the waste margin. This integration ensures that the converter maximizes the yield of every purchased roll.

Operational Cost

Because paperboard represents the largest single cost in packaging production, even small errors in yield arithmetic can have a large impact on profitability. If the yield is overestimated, the converter will purchase too little board, leading to costly press stoppages and missed delivery dates. Conversely, underestimating the yield results in excess inventory that ties up cash and warehouse space.

Precise calculation is therefore necessary to maintain a competitive and profitable converting operation.