Is it strong enough? Tensile strength, burst strength, and short span compression tests make sure your containerboard components have the right specifications.
There are a number of standardized tests that are used to determine the strength and durability of containerboard components.
The below video shows how to measure tensile strength, which tells you how resistant a paper is to web breaks. The tensile strength measurement is used for calculating tensile stiffness. The measurement unit is kN/m, kilonewton per metre.
It's only since recently that lightweight papers have been able to manifest sufficient strength to be comparable for the intended end uses. Please be aware that many test methods are developed for 100 grams per square metre and up, and may need adaptions to avoid limitations. Therefore, CEPI Containerboard association defines their test results for papers <100 grams per square metre only as indicative.
Short span compression test, SCT, tells you how much compression force your paper can take before the structure starts collapsing. A strip of paper is compressed between two clamps until the paper buckles. SCT is measured in kN/m, kilonewton per metre.
The burst strength video shows how to measure how much pressure a paper sheet can stand before it bursts. The paper is clamped down and exposed to pressure. The measurement unit for burst strength is kPa, kilopascal.