Tensile strength (TEA) of paper and paperboard

This test is used to determine the folding endurance of paper or board using the Köhler-Molin, Lhomargy, MIT, and Schopper testers. During the test, a narrow strip of paper is folded forwards and backward in a standardized manner, so that it is subjected to longitudinal stress until it breaks.

Horizontal impact testing by the ISO 2244 standard is used to determine the effect of a vertical impact on the horizontal edge of finished and filled cardboard containers. In the test, the packaging is placed on a carriage that is rolled against an impact apparatus. Testing can include a single test or a series of impact tests to evaluate the packaging's ability to perform in environments with a horizontal impact hazard.

This test is used to evaluate the compressive strength of paper and board with the ring crush method. Testing is particularly useful when determining the usability of shipping containers made from fiberboard.

The Scott bond test measures the energy required to rapidly delaminate a sheet-type specimen. A z-directional rupture is initiated by the impact of a pendulum having both a controlled mass and a controlled velocity. The geometry of the apparatus causes the tensile stress to be rotational with negligible shear stress on the specimen. The energy is absorbed during the elongation and stretching of the sample's fiber network before rupture. The test is a measurement of strain energy per unit sample area, which is proportional to the area under the stress-strain curve.

In this test, a pyramid-shaped puncture head is used to measure the puncture resistance of a board sample. During this process, combined tensile, compression, flexural, and shear forces occur. The result is given as the energy absorbed by the sample upon being punctured. If you need a puncture resistance test for another material, please contact us to request an offer.

SCT (short-span compression test) is one of the most commonly used testing methods for determining the compression strength of paper or cardboard. In this test, the sample is conditioned in standard conditions (23 °C/50% RH), after which the compression strength is measured in the machine direction (MD) and the cross direction (CD).

The pin adhesion test measures the bond strength between the corrugated medium and the liner. It is used to analyze the strength of adhesives. Upon request, the measurement can be performed on double-walled and triple-walled corrugated cardboard.

This method determines the tearing resistance of low-grammage paper or board with the Elmendorf method. During the test, an initial cut is made on the test specimen. This cut is then torn for a given distance using a pendulum. The work required to tear the test piece is measured, and the mean tearing force is calculated. The result is given in newtons (N). The price includes measurements in both machine and cross direction.

Air permeability is an important property for some paper grades, such as paper bags that are filled industrially. Measurlabs offers air permeance testing with the Bendtsen and Gurley methods. The Bendtsen method (ISO 5636-3) is suitable for papers with permeance from 0.35 µm/(Pa*s) to 15 µm/(Pa*s). It is not suitable for rough-surfaced papers that cannot be securely clamped to the device. The results are reported in ml/min, expressing the average volume of air that passes through the material in a minute at elevated pressure. The Gurley Method (ISO 5636-5) is suitable for papers with permeance between 0.1 µm/(Pa*s) and 100 µm/(Pa*s). The test may also be used to determine the air resistance of paper and board. In the Gurley test, the time it takes for a certain volume of air to pass through the paper at a certain pressure is measured in seconds.

The method measures the diffuse blue light reflectance factor of paper and board by the ISO 2470-1 standard. The test is limited to white and near-white samples.