NEWS: Bio-Based Packaging Film with Oxygen Scavenging

30-08-2017

The Fraunhofer Institute, an AIPIA member, working with the Technical University in Munich and others has engineered a multilayer bio-based packaging film which uses a mixture of gallic acid (GA) and atsodium carbone as an oxygen scavenger .

The film is  produced in a three-step process: compounding, flat film extrusion, and lamination. Researchers investigated the film surface colour as well as oxygen absorption at different relative humidities (RH) and temperatures, and compared the oxygen absorption of powder, monolayer films, and multilayer films.

The films were initially brownish-red in color but changed to greenish-black during oxygen absorption under humid conditions. The team observed a maximum absorption capacity of 447 mg O2/g GA at 21 ◦C and 100% RH. The incorporation of GA into a polymer matrix reduced the rate of oxygen absorption compared to the GA powder because the polymer acted as a barrier to oxygen and water vapor diffusion.

As expected, the temperature had a significant effect on the initial absorption rate of the multilayer films; the corresponding activation energy was 75.4 kJ/mol.  Higher RH significantly increased the oxygen absorption rate.

These results demonstrate for the first time the production and the properties of a bio-based multilayer packaging film with GA as the oxygen scavenger. Potential applications include the packaging of food products with high water activity, say the developers.

 

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