STRETCH AND SHRINK FILM | MATERIALS
Secondary packaging – such as stretch and shrink film – helps to protect goods in transit, which can have an enormous effect on both product returns and environmental performance
Stretching performance for protective packaging
Stretch and shrink film help to secure packaging in place – such as when in transit on a pallet. Although it plays an important role in protecting goods from damage, there is an increasing need to ensure that film is produced in a more sustainable way – such as by incorporating more recyclate. Colines of Italy has expanded the capacity of its
AllRollex cast film lines to make stretch film. The latest development relates to the use of
special expanding shafts. These ensure high quality when winding machine rolls using 800g cardboard cores – which are 20% lighter than the 1kg card- board cores used on the lines since 2013. “For manual rolls, we set our new standard to 220g for the cardboard cores, almost 25% less than the common 280g cores,” said Nicola Lombardini, R&D manager at Colines. In addition, the company has improved perfor- mance in term of flexibility.
“Our customers don’t need to stop or slow the line when they want to change roll width or diameter, thanks to the fully automatic core-loading
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system,” said Lombardini. “Finally, the ‘soft’ roll- unloading system guarantees high-speed unload- ing of each roll with no damage to the roll itself.” Recently, Colines also tested its automatic
stretch-wrapping machine – and found that its 12-micron Nanolayer film – made on an AllRollex line – can perform a pre-stretch ratio of up to 380% without either breaking or speed reductions. This brought the film thickness down to 3 microns.
Corrosion resistance Cortec of Croatia says it has developed a com- postable, corrosion-inhibiting stretch film called EcoStretch. The machine-grade stretch wrap combines compostable resins with its corrosion inhibitor technology, which protects multiple metal types including aluminium, various steels, copper, brass, and cast iron. EcoStretch meets the ASTM D6400 standard for
commercial composting and may avoid tariffs, fines, and tip fees in areas where polyethylene is
July/August 2021 | FILM & SHEET EXTRUSION 37
Main image: Cor-Pak stretch hoods combine speciality plastomer resins with corrosion inhibitor technology
IMAGE: CORTEC
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