Problem: Suspicion of plagiarism
In a recent study, patterns of Packaging from paper with plastic film a different behavior under mechanical stress. It has been suspected that some of these packages are plagiarism could be. To ensure differences in strength To analyze the materials, the GWP commissioned to carry out comprehensive laboratory tests.
Procedure: Mechanical tests
As part of the investigation, force tensile tests an test strips with a width of 30 mm carried out. The force-displacement curve recorded, and in addition found tear propagation tests The results of the tests showed clear differences between the samples:
- batch A: In the samples of this batch, the Paper Industry at a force of approx. 60 NAfter the crack, the force dropped to approx. 20 Nwhile the Plastic film stretched without further loss of strength or tearing.
- batch B: In the samples of the other batch, the paper also tore in the similar force range around 60 NHowever, after a drop in power to approx. 15 N quickly holes in the plastic film, and it began to tear.
Material analysis: Differences in plastic films
By IR analyses The assumption was confirmed that the used plastic films different materials. This led to the conclusion that the bags were products of different quality.
Further investigations: Characterization of the films
Additional investigations enabled the films to be characterized in more detail in order to identify differences in Material quality and strength to analyze comprehensively.
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