THIN-WALL PACKAGING | PROCESSING


He said that the main application of PP in thin wall packaging was for food containers such as cups and trays. The advantages include high productivity, low cost and light weight. “There is a trend towards thinner packaging


from the perspective of resource saving,” he said. PP comes in two crystalline forms, he said – al- pha and beta. While the alpha-form is more stable – and has high flex modulus – it has low impact strength and moderate transparency. The metasta- ble beta-form shows high elongation and impact strength – but low transparency. Typical applications of beta-crystalline PP include films with microscopic voids – for tapes and labels – and stretch film. The structure also has potential benefits in thermoforming. “Beta nucleating agents increase the fraction of beta-crystals – increasing ductility, elongation and impact strength and improving the stretchability of extruded sheet,” he said. The nucleating agent can also be used to widen


the processing window for extruded sheet – allow- ing it to be uniformly drawn, which minimises thickness variation.


The lower forming temperature of beta-crystals also helps to avoid sheet sag. The company’s novel NA-B99 stabiliser claims high nucleating performance and beta crystal formation ability. In addition, it improves the impact strength and HDP to of PP – and exhibits low anisotropic shrinkage. “It improves the performance of beta-crystalline PP and is expected to contribute to the expansion of beta-crystalline PP applications,” according to Mara. n AMI’s next edition of Thin Wall Packaging is held in Cologne, Germany on 28-29 November 2023. For more details, contact Rebecca Weir on +44 (0) 117 314 8111 (rebecca.weir@amiplastics.com).


CLICK ON THE LINKS FOR MORE INFORMATION: � www.amiplastics.com � https://www.ameripen.org/ � www.berryglobal.com � www.tekpak.com � www.purecycle.com � www.amfine.com � www.kiefel.com � www.solenis.com


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