Description

Keith Kellicutt showing the strength of a triple wall corrugated fiberboard container. The holes in the container assure observers that there are no internal supports. (1960's)

CODE41 is a suite of programs, PPR, ECT, BCT, and CAL, that reduces box compression analysis to a set of component sub problems. PPR converts linerboard and corrugating medium test data into stress-strain properties. ECT predicts the edge crush strength of corrugated fiberboard and the stress-strain properties of equivalent homogeneous plates. Edge crush strength is determined in the usual cross machine direction and also the machine direction from arbitrary fluting geometry. Single wall, double wall, and triple wall combined boards with sensitivity to asymmetric construction can be analyzed. Then, BCT predicts box compression strength for various loading directions and flute orientations. With CAL, predictions are made accurate by calibrating the theory to fit actual data.