Scoring Parameter
Structural variables for carton production define the relationship between the depth of a score line and the overall thickness of the paperboard. The paperboard score depth ratio is a measure of how far a creasing rule penetrates the material relative to its total calliper. This value is used to predict the folding force required and the likelihood of the board cracking during the conversion process.
Folding Analysis
Achieving the correct ratio involves adjusting the height of the creasing rule and the thickness of the make ready under the board. A typical ratio for high quality folding boxboard is around fifty percent, meaning the rule displaces half of the board’s thickness into the matrix channel. If the ratio is too high, the board is weakened and may tear along the crease.
If it is too low, the fold will be bulky and the carton will not hold its shape on the filling line. Operators use micrometers to check these dimensions during the set up of the die cutting machine.
Process Stability
Consistent ratios across a production run ensure that all cartons perform the same way in automatic machinery. This control prevents downtime caused by packages that fail to open or close correctly.
