Load Share: A Study Of Sturdy BY ACME CORRUGATED BOX
Board Converting NEWS INTERNET DIRECTORY
One of the most important factors in box design is also one of the least understood: Load sharing, the extent to which a box’s contents contribute to crush resistance, or its ability to stand up to weight placed on top of it. Because box stacking is common practice, designers need to un- derstand a box’s contents (which determine load share) and the box’s end use (which determines the need for load share) before they can start designing it. “Box design is more complex and critical than many people realize,” explains Jeff Bittner, Business Develop- ment Manager at Acme Corrugated Box. “It’s why our de- sign team does a deep dive with customers before they design any made-to-order corrugated product. From tran- sit to storage conditions to warehouse practices to end use, there are many factors to consider, and many of these factors brush up against the topic of load share.” A Top To Bottom Look High load share is achieved when a box’s contents are sturdy enough and packed tightly enough to enhance a box’s stacking strength beyond the box’s standard crush
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resistance rating. A box packed tightly with books, for ex- ample, has near-infinite load share. “Assuming every cubic inch of that box is filled with books, it would take vast amounts of pressure to crush it, because books are practically crush-resistant,” Bittner says. “Theoretically, you could stack these boxes to the sky without crushing the books or the bottom-most boxes. We call this absolute load share. The product is doing all of the work; the box is really just a protective wrapper, freed from the burden of stacking strength.” Load share decreases when there’s empty space be- tween the top of contents and the top of the box (known as head space) or if there’s empty space between or around contents, known as air channels. “A box packed three-quarters high with books offers limited load share because while the books’ sturdiness could help with the structural integrity of the box, the head space could invite crushing if the boxes are stacked too CONTINUED ON PAGE 36
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34 May 30, 2022
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