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stretch hood- and stretch wrap films- characterization by hysteresis tensile test (only in stretching direction, e.g generally in TD)
Stretch hood tubular films, while processed, are cut, sealed and stretched in transverse direction, so that they can be put over a packed pallet contactless. The film then is relieved and due to the viscoelastic restoring forces of the material resulting a slight tension, the film lays closely spaced to the load on.
Since the standard tensile test is not suitable for testing the special properties of these products, we have developed this laboratory test, which follows the most important basic points of the stretch hood process under reproducible conditions. This hysteresis tensile test may be used for material comparisons and for specifying appropriate types of film. Also suitable for wrapping stretch film, which are however normally tested longitudinally.