Tensile test on sheets and film to ISO 527-3
Tensile tests on films are of great significance in the film packaging industry. The tensile test on film provides measured values about the behavior of a material under quasi-static, uniaxial, continuously increasing tensile load.
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Brief explanation of tensile properties to ISO 527-3
Films and sheets with a thickness of up to 1 mm are tested using strips or dumbbell specimens. The typical specimen shape used in ISO 527-3 and ASTM D882 is a strip specimen. This specimen shape can be easily machined using a specimen or film cutter. Dumbbell specimens are often used in quality control. For this, a direct measurement extensometer is required to measure the specimen strain directly at the specimen.
Typical test results are characteristics such as
- Yield stress
- Yield strain
- Maximum stress
- Nominal strain at break
When testing strip specimens, the strain at break results depend on the specimen shape and the type of specimen gripping used. We recommend the use of parallel clamping specimen grips. The grip inserts should be arranged so there is linear contact between the jaw and the specimen.
Automated test on films with the roboTest F robotic testing system
Quality control is imperative in the manufacturing of plastic products, such as films. In order to make materials testing in the manufacturing process efficient and safe, ZwickRoell developed the roboTest F robotic testing system.
- The testing system includes an AllroundLine testing machine with an extended test area.
- Specimens for tensile testing are fed into the system by a specimen magazine that holds up to 200 specimens.
- The magazine consists of a base and a revolving chain with grippers for gripping the specimen.
- These grippers vary depending on the specimen type and shape. This means that films and textiles of various dimensions can be tested by the same system.