MATERIALS | STRETCH AND SHRINK FILM
three types of load – salt bags, water bottles and glass bottles – with at least two different types of film. Film tension was measured on a Lantech device. Test films were Kraft paper film, LLDPE made from virgin plastics, and two grades of LLDPE with either 30% or 50% PCR. Different wrapping scenarios were tried. For
Above: Pallet stabilisation is critical to ensure minimal product waste
Packaging simulation Victor Gallego, packaging and transport simulation unit coordinator at Itene in Spain, explained how the company has also compared a range of materials for how effectively they stabilised palletised loads. It included the wrapping opera- tion, rigidity and stability tests, elastic and perma- nent deformations and final measurements (of film tension and film weight). For instance, the wrapping operation tested
instance, salt bags were wrapped 20 times or 26 times depending on the wrap used. Salt bags were wrapped 18 times, glass bottles 30 times. Results showed that film made from virgin resin was as economical as one with PCR content – as this needed more film. Overall – based on the amount of material used – kraft paper used the most material, followed by 23-micron, 30% PCR film, then 20-micron, 50% PCR film, then 12-micron virgin film.
Gel protection OCS and Windmoller & Holscher, in a joint paper, said that factors such as gel reduction can help to improve stretch film quality, for pallet wrapping – as it was one of the main causes of film breaks on a wrapper.
OCS testing and measurement systems such as
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