The Science of Corrugated Web Interactive 17.03.25 - Flipbook - Page 10
Case Size
Ratios Matter
Typically theoretical Box Compression Test (BCT) performance is reliant upon the McKee formula, which
uses the perimeter of the case rather than the individual length:width:depth measurements. This can
have a signi昀椀cant effect upon the BCT performance.
The McKee formula would calculate the below examples, with the same perimeter, to have the same
BCT value. However due to the length to width ratio, this is not the case.
Example:
Square Case
Rectangular Case
300 x 300 x 300
400 x 200 x 300
Increases load bearing
Bends out
Bends in
Buckling is evenly
distributed
First point of buckling
sooner than a squarer
case
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