Fold Line Specification
Physical dimensions and angles of the indentation made in paperboard define the success of a folding operation. Crease score geometry accounts for the depth of the groove and the corresponding bead formed on the reverse side of the material. This profile ensures that the board folds along a precise line without cracking the outer liners or rupturing the internal fibres.
Proper settings allow for a clean ninety-degree bend with minimal resistance.
Tooling Relationship
The interaction between the male creasing rule and the female matrix determines the shape of the score. To achieve the correct crease score geometry, the width of the rule must be matched to the thickness of the board and the width of the channel. A channel that is too narrow will crush the board and lead to surface splitting.
Conversely, a wide channel produces a loose fold that lacks the tension needed for automated filling lines. Adjusting the penetration depth of the rule allows the operator to compensate for board density or moisture content.
Quality Control
Visual inspection and thickness gauges verify that the scores are consistent across the entire sheet. When the crease score geometry is incorrect, the carton panels may bow or the glue tabs may fail to align.
