Compression Standard
Structural corrugated testing procedures evaluate the mechanical load-bearing capacity of a short column of board to predict the stacking strength of finished shipping boxes. The test method defined as TAPPI T811 establishes the standardized protocol for measuring the edgewise compressive strength of corrugated paperboard.
Test Execution
Technicians cut a small rectangular specimen from the corrugated board with the flutes running vertically. They coat the top and bottom edges with paraffin wax to prevent premature crushing during the test. The prepared specimen sits between the flat platens of a compression machine until it collapses under the vertical force.
The peak load before failure determines the edge crush test value of the board.
Packaging Use
Packaging designers use these measurements in the McKee formula to calculate the top-to-bottom compression strength of a finished box. When the test results do not meet the minimum TAPPI T811 value, the cartons can collapse in warehouse stacks. This test ensures that the corrugated board has the necessary resistance to handle transit vibrations and humidity variations.
Mill managers monitor this value to verify that the corrugator runs are producing consistent material. This benchmark remains the most important quality metric for corrugated packaging boards.
