Scott bond is used to determine the internal strength of paper or board to determine the energy required to rapidly delaminate a sheet type specimen. A rupture in the Z direction is initiated by the impact of a pendulum having both a controlled mass and a controlled speed. The geometry of the apparatus used causes the tensile stress to be rotational with negligible shear stress on the specimen. The energy is absorbed during elongation and stretching of the fiber network of the specimen prior to rupture. The test is a measurement of the tensile energy per unit specimen area, which is proportional to the area under the stress-strain curve.
This test method is suitable for single and multi-ply paper and paperboard, coated boards and boards laminated with synthetic polymer films. However, it is not suitable for papers with a grammage below 40 g/m2.
A Scott bond test is typically performed to determine the strength of an adhesive to hold two materials together when under tension. Once the bond is applied, the strength of the bond is tested by applying force to the adhesive to separate it from the material.
The overall bond strength of a material is considered to be determined by the type of bond and the temperature at which the test is performed. The direction of the force applied to the bond also affects its strength.
The standard that Scott bond tests are primarily based on is the “TAPPI T 569 Internal bond strength test” standard developed by the Technical Association of the Pulp, Paper and Converting Industries (TAPPI). This standard is an industry standard used to measure the energy required to rapidly delaminate a sheet type specimen. This internal bond test method is regularly used in testing solutions for a wide range of packaging materials and provides essential quality information on how well a sheet will perform under stress.
The test methods described in the TAPPI T 569 standard are suitable for single and multi-ply paper and paperboard coated sheets or sheets laminated with synthetic polymer films and can test the internal bonding of a wide range of materials. From cardboard and corrugated paper to adhesives, films and foils, there is a test solution for determining the internal bond strength.
When performing tests, the sample must be placed between two double-coated tape substrates. A high-speed impact is then created by dropping a pendulum or weight. The total energy required to separate the internal fibers of a sample into two layers in the Z-type direction is measured to determine the internal bond strength of the sample. The required pendulum weight varies depending on the type of sample being tested. Some testing machines can test multiple samples simultaneously, and most offer automatic pressing and cutting of samples, saving setup time.
To test the internal bond of a board using the TAPPI T 569 method, the sample must be subjected to a relatively high pressure environment and placed between two double-layer tape substrates. This method is not suitable for testing porous, soft or low-density materials with low basis weight (below 40 g/m2).
Another standard used to determine the internal bond strength of a board is the “ISO 16260 Paper and board - Determination of internal bond strength” standard developed by the International Standards Organization (ISO).
Briefly, the TAPPI T 569 Scott bond type test measures the energy required to rapidly delaminate a 25,4 mm x 25,4 mm cardboard sample.
Among the numerous testing, measurement, analysis and evaluation studies that our organization has provided for businesses in various sectors, it also provides Scott bond testing services with its trained and expert staff and advanced technological equipment.
To get an appointment, to get more detailed information or to request an evaluation, you can ask us to fill in our form and reach you.
