![]() The reason is that hand holes remove material from the box, rendering it weaker. Hand holes have an influence on which test is designated on the box maker’s certificate (BMC). Mullen Burst Test and Edge Crush Test (ECT) indicate resistance to rough handling and to compression (stacking), respectively. That certainly applies to the liners, but can apply to the flutes, as well. If the required measure-of-safety only can be met with virgin, then, so be it. Sustainability notwithstanding, there’s no denying that virgin Kraft is stronger than recycled. Furthermore, the properties of a given combination can differ, depending on which is the outer and which is the inner flute. When different flutes are used, their heights and number-per-linear unit make for an alignment that’s staggered and more resistant to forces. ![]() With double-wall, it’s best not to use the same flute for both layers, to avoid arches aligning one on top of the other. ![]()
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