Board Specifications

Where cases are to be transported on pallets and/or stacked there are a number of factors to consider in determining the board grade and case specifications. A major consideration is the nature and weight of the contents intended for each case.

The aim is to ensure the cases perform to expectation during transit and Charta will advise you what is appropriate for your needs.

Factors to be aware of

Stacking Configuration

The case shape is important in determining the load that bottom cases will have to bear. Low, flat cases result in fewer units on each layer but there are more layers; tall narrow cases result in more units per layer but there are fewer layers.

Therefore the bottom cases on the pallet with more layers carry significantly more weight.

Pallet Configuration

The load carrying ability of a case is related to the strength of the vertical walls when compressed. The case is strongest on the corners, where the walls meet, and weakest at the centre.

Aligning the strongest case points together, and the weakest points together, will provide the best stacking strength. This is only achieved by column stacking.

Pallet Size and Condition

If stacked cases extend beyond the area of the pallet the strength of cases is reduced as the weight bearing wall panels have no direct support. Even an overhang of 25 mm can reduce case strength by 32%.

Broken and missing slats create gaps in the pallet which also reduce the strength performance of cases.

Storage Conditions

The storage environment is another consideration in determining board grade specifications. Humidity, cool store and freezer conditions, or other unusual atmospheres, must be known.

Board Performance Tests

The recommendations Charta make on board specification are based on international measurement standards. These include edge and flat crush tests, burst strength and box compression. Water absorption resistance can also be measured for boards intended for such conditions.