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Film coatings made from whey
Date:1/9/2012

ding film-forming properties. To enable these proteins to withstand the mechanical loads involved, they were subsequently mixed with differing concentrations of various softeners and other additives, which were also biobased. "All these additives are approved substances," says Schmid. The search for the perfect formula was a tricky process for the Freising-based researchers. For example, use too many softeners and the barrier effect against water vapor and oxygen decreases, which means that the food is no longer adequately protected. In the end, the researchers not only found the optimum formula, but also came up with a suitable, economically viable and industrial-scale method of applying whey protein coatings to plastic films and combining these with other films using different technologies. The overall process produces multilayer structures with barrier functions which can be used to produce flexible, transparent food packaging materials. "Our work at the IVV to manufacture a multilayer film of this kind using a roll-to-roll method is a world's first," Schmid notes. Companies that choose to make the switch to whey proteins in the future will only need to make minor modifications to their plants. The researchers have already applied for a patent on their new technology.

The IVV researchers are so convinced of whey proteins' future potential as an alternative packaging material that they have initiated their own project which goes one step further. According to a survey carried out by the German Society for Packaging Market Research, there is not only an increasing demand for composite films, but also an increasing need for thermoformable composites. Growing demand for prepared products in trays is expected to increase the volume of these composites from 76,497 tons in 2009 to 93,158 tons in 2014. The researchers are working hard to replace EVOH in thermoform composites with a barrier layer based on whey protein. This additional application for whey protein
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Contact: Klaus Noller
klaus.noller@ivv.fraunhofer.de
49-816-149-1500
Fraunhofer-Gesellschaft
Source:Eurekalert  

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Film coatings made from whey
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