Creasing Severity and Reverse-side Cracking, 19PaperCon
In this work, we investigate approaches to quantify the creasing severity that causes cracking on the reverse-side (bead-side of the crease) of the paper. A method to quantify reverse-side cracking was developed, which defines the cracking degree as the percent of the total creased length that shows cracks. Samples were creased with a range of rule and channel geometries. The cracking degree is typically below 1% at low crease penetration depths, then becomes exponentially higher beyond a critical penetration depth. A rule and channel combination with a wider clearance shifts this critical depth to a larger value.
The creasing draw converges the cracking degree data from different rule and channel combinations into a single curve. The creasing draw is derived from the same analytical expressions as the transverse shear strain and quantifies the length of paper that is drawn into the channel during creasing. The critical draw is defined as the draw at which cracking becomes greater than 5%, which corresponds with the point at which cracking becomes exponential. The critical draw then becomes a limit below which cracking will be minimal.
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Creasing Severity and Reverse-side Cracking, 19PaperCon