Corrugated Flute Calculator

Take-up factor is the ratio of fluted-medium length to liner length — since the medium travels in a wave shape while the liner stays flat, taller flutes with a more pronounced wave need proportionally more medium material. A-flute has the tallest profile at 4.8mm and the highest take-up factor at 1.50, while F-flute is shortest at 0.8mm with the lowest take-up at 1.25, so switching from F-flute to A-flute at the same board area increases medium consumption according to that take-up multiplier.

Wall type sets liner layers as wallType plus 2 and medium layers as wallType plus 1: single wall (0) uses 2 liners and 1 medium, double wall (1) uses 3 liners and 2 mediums, and triple wall (2) uses 4 liners and 3 mediums. Each additional medium layer applies the flute's take-up factor again, so medium consumption scales with both flute choice and wall type together, not just one or the other.

Board caliper sums flute height across all medium layers, plus an estimated liner thickness derived from liner GSM at an assumed paper density of about 700 kg/m³, multiplied by liner layer count. It's a geometric approximation, not a die-measured caliper, since real board can compress slightly during the corrugating process.

The Edge Crush Test estimate uses a simplified ring-crush approximation — roughly 0.08 times GSM per layer, summed across liner and medium layers weighted by their layer counts, then scaled by a 0.585 factor. It's built for relative comparisons between different flute, wall, and GSM combinations, and shouldn't replace lab-measured combined-board ECT when specifying an actual box's compression requirement.