What is the McKee formula?
Box compression is predicted or calculated using a formula. The most widely used formula is known as the McKee Formula. It employs ECT, caliper, and box perimeter to predict box compression. A version of the McKee formula. C = 5.87 x P x √hZ.
How do you calculate the compression strength of a corrugated box?
Compression Strength = 5.874 * ECT * CAL0.508 * PER 0.492 (For more information on the McKee formula, please refer to the August 1963 issue of Paperboard Packaging, Compression Strength Formula for Corrugated Boxes by R. C.
What is take up factor in corrugated?
The take-up factor governs the amount of fluting material required to manufacture the corrugated board. It allows for the fact that, when laid out flat before converting, the area of fluting material required to manufacture a defined area of corrugated board is greater than the surface of the converted board itself.
What is BCT value?
BCT, which stands for box compression test, is a test done to determine the strength of a corrugated board box in direct measure of its stacking strength. Box strength will change as they are transported from one place to another while stacked and also based on the weather conditions.
What does 32 ECT stand for?
ECT is used as a way of telling you how heavy duty your box is. As an example, 32 ECT is similar to a standard box strength. 44 ECT is a heavy duty box strength. 48 ECT is a heavy duty double wall box strength.
What is the thickness of B flute corrugated?
1/8″
B-flute is a good alternative to E-flute when wanting to support heavier items. With a thickness of 1/8″ and shorter flutes, this type of box still provides a rigid, flat surface for printing.
What is the formula for compressive strength?
F = P/A
The formula to calculate compressive strength is F = P/A, where: F=The compressive strength (MPa) P=Maximum load (or load until failure) to the material (N) A=A cross section of the area of the material resisting the load (mm2)
What is the limitation of Mckees equation?
… Therefore, the McKee equation of carton compression strength cannot be used when there are irregularities in the packaging such as the presence of cut-outs such as vents, hand holes and perforations.
How is ECT calculated?
It is measured by compressing a small segment of board on edge between two rigid platens or plates perpendicular to the direction of the flutes until a peak load is established. This is measured in pounds per lineal inch of load bearing edge (lb/in), but usually reported as an ECT value (for example, 44 ECT).
What is a flute in corrugated?
Flute, also called corrugation, is used to strengthen or reinforce the cardboard that’s used in your packaging. They typically look like wavy lines which when glued to a paperboard, forms the corrugated board. Fluting in packaging gives your packaging the rigidity and helps withstand any crushing.
What is BCT and ect?
The ECT (Edge Crush Test) and BCT (Box Crush Test) are two completely separate tests yet they are similar in various ways. The Edge Crush Test involves taking a 2 x 2 cardboard specimen and crushing the edge between compression platens with our lowest cost tabletop machine.
How do you calculate ECT?
What is the McKee formula for Box compression?
The McKee formula estimates box compression strength or the maximum load a box can stand for a moment. If you enter ECT grade along with the caliper of the combined board and the length, width and depth of the box, the McKee formula calculates a theoretical compression value for your box.
What is the shortend version of the McKee formula?
The shortend version of the McKee formula is: CFL = 5.3 * ECT * T * Z where: CFL = 53 * ECT * T * Z where:
Can I use boxcomp instead of the McKee formula?
It should be noted that the McKee formula is being superseded by more accurate formulas developed in recent times. The programming code for Boxcomp is provided within the HTML page and is modular in nature, enabling not only other board materials to be added or substituted, but new calculation formulas to be used instead for McKee.
Compression Strength = 5.874 * ECT * CAL0.508 * PER 0.492 (For more information on the McKee formula, please refer to the August 1963 issue of Paperboard Packaging, Compression Strength Formula for Corrugated Boxes by R. C. How much weight can a 32 ECT box hold?