DuPont: High-performance film for food packaging

Montorsi Francesco & Figli SpA, part of the Veronesi Group and an Italian leader in processed meat, has worked with DuPont Packaging & Industrial Polymers () to develop a new high-performance film for flow-packing AIA brand roasted turkey breast.

This new solution, which is also used by Montorsi to package other food specialities, relies on the proprietary features and performance of DuPont™ Surlyn brand resin. It offers maximum hygiene, an excellent secondary seal with perfect adhesion to the meat, a high barrier against gas, resistance to pasteurising temperatures, and excellent features in terms of brilliance and transparency.

The packaging film, which contains polyamide and EVOH, features a sealing coat made of a special zinc-based Surlyn resin, which has several particularly important properties for this specific application.

“We were looking for a packaging material that could offer the best possible performance in terms of secondary seal,” says Agnese Prete, head of packaging department at Montorsi. “In changing the type of packaging used for several of our products sold to delis and catering businesses, which we protected in the past using heat-shrink packaging, we sought a vacuum flow-pack that would adhere perfectly to the meat. We didn’t want the liquid that can ooze from the cooked meat to move about inside the package. The types of metallocene polyethylene we tested were unable to satisfy this requirement.”

“The film also had to be able to resist pasteurisation without any problems, a treatment that requires temperatures of up to 90 °C. Moreover, it also had to offer a high barrier to oxygen and, of course, be suitable for direct contact with food,” adds Prete. The key to the solution came from a film made with a zinc-based grade of DuPont Surlyn, which yields a packaging film that can be wrapped around the meat like a second skin.

The DuPont material has a high melting point and can stand pasteurisation temperatures without any problems. Moreover, it complies with the standards in force in the European Union and in the US for direct contact with food. Thanks to the use of polyamide and EVOH, this new film is thinner, yet offers the same shelf life as the packaging used previously.

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