1. What is Corrugated Box Strength?

Corrugated box strength refers to the maximum compression load a box can withstand before failure. It's determined by the Edge Crush Test (ECT) value of the corrugated board and the box dimensions.

2. How Does the Calculator Work?

The calculator uses the McKee formula:

Where:

• \( ECT \) — Edge Crush Test value (lb/in)
• \( Perimeter \) — 2 × (Length + Width) of the box
• \( Depth \) — Depth/height of the box (in)

Explanation: The formula calculates the box compression strength based on material properties and box dimensions.

3. Importance of Box Strength Calculation

Details: Accurate box strength estimation is crucial for packaging design, ensuring products are protected during shipping and storage, and optimizing material usage.

4. Using the Calculator

Tips: Enter ECT value in lb/in, and box dimensions in inches. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is ECT?
A: Edge Crush Test measures the compression strength of corrugated board perpendicular to the flutes.

Q2: How does box size affect strength?
A: Larger boxes generally have lower compression strength due to increased surface area and potential for buckling.

Q3: What are typical ECT values?
A: Common ECT values range from 32 lb/in for single-wall to 100+ lb/in for double-wall corrugated board.

Q4: Are there limitations to this calculation?
A: The formula provides an estimate. Actual performance may vary based on humidity, storage time, and manufacturing quality.

Q5: How is this used in packaging design?
A: Designers use this calculation to select appropriate board grade and optimize box dimensions for required strength.