One of the important functions of a corrugated box is to provide crush resistance (product protection) and adequate strength for stacking in warehouses.
A box can be designed by optimizing the grade of corrugated board, box design, flute direction, and inner supports. Support from the product also provides “load sharing” and can be an important factor.Box closures sometimes can have effects on box stacking strength.
If long-term storage of corrugated boxes in high humidity is expected, extra strength and moisture resistance is called for.
The method of loading boxes on pallets strongly affects stacking. Vertical columns provide the best box performance while interlocking patterns of boxes significantly reduce performance. The interaction of the boxes and pallets is also important.
Box compression testing is a means of evaluating boxes, stacks of boxes, and unit loads under controlled conditions. Field conditions of stacking and dynamic compression do not have the same degree of control. Compression strength can be estimated based on container construction, size, and use parameters: actual package testing is often conducted to verify these estimates.
Many packaging engineers find it beneficial to periodically audit warehouses and visit customer’s package receiving operations. When field performance is observed or documented to have problems, a new cycle of design and testing may be justified. for a corrugated box to withstand the deformation while stacking or storage.