What is a Box Compression Test?

A box compression test is a method used to assess the compressive strength of corrugated boxes and cartons. This test determines the capacity of the material to withstand loads that tend to reduce its size. By following international standards, the test helps ensure that packaging materials can protect their contents during transportation and storage.

What is a Compression Tester?

• Load Cell: Measures the force applied to the material.

• Crosshead(s): The moving parts that apply the load.

• Compression Test Tools: Fixtures and accessories for securing the test sample.

• Electronics: Controls and records data from the test.

• Drive System: Powers the crossheads and controls the speed of the test.

These components work together to provide precise measurements of how a material behaves under compressive stress.

How to Calculate Box Compression Test?

The Box Compression Test (BCT) can be calculated using the following formula:

BCT=5.876×ECT×𝑃×𝑇

BCT=5.876×ECT×

P×T

​

Where:

• BCT: Box Crush Test value.

• ECT: Edge Crush Test value.

• P: Box perimeter (in inches).

• T: Box thickness (in inches).

• SQRT: Square root function.

Definitions:

• Box Compression (BCT): The maximum load-bearing strength of a carton with a given design and size, measured in Newtons (N).

• Compression Strength (FC): The intrinsic strength of the paperboard, representing its maximum load-bearing capacity per unit width, measured in kilonewtons per meter (kN/m).

Conclusion

Box compression testing is essential for determining the durability and strength of corrugated boxes and cartons. By understanding and utilizing the results from these tests, manufacturers can ensure their packaging materials meet the required standards and provide adequate protection for their contents.