The new products of biodegradable metal-plated polylactide (PLA) biodegradable films developed by the research group of German company Treofan have significantly reduced the fragrance, oxygen, and moisture permeability of products compared with those without metal film. This PLA film Biophan and paper composite packaging is very suitable for foods with high fat content, such as: cream, dried cheese and various kinds of candy. At present, French dairy producer Richard Laleu has already expressed his approval to Biophan and has taken the lead in the packaging of its soft cheese products.
US NatureWorks is currently researching plastic bottles made from renewable resources to replace barrier PET bottles. The company is a well-known company that produces biodegradable plastic polylactic acid (PLA) from corn starch.
In the past, the use of PLA for packaging was limited mainly because its cost was higher than that of petroleum-based plastics, but rising oil prices prompted PLA bottles to start challenging PET bottles. NatureWorks and its partners are currently studying the use of coatings and additives to improve the barrier properties of PLA bottle packaging. The co-injection molded multilayer bottle method with a typical barrier resin as the intermediate layer and PLA as the inner layer and outer layer has been successfully applied, and can significantly improve the barrier properties of the package to water vapor and oxygen. The PLA bottle is compatible with the existing two surface coating technologies. It is possible to use SIGCorpoplast's Silicon Oxide Plasma (plasma) coating and Sidel's amorphous carbon coating Actis to enhance the PLA single layer bottle for CO2 and oxygen. Blocking
A French vegetable packaging manufacturer Brodart's fruit and vegetable salad packaging, all made of biodegradable material PLA, has a very clear transparency and excellent water vapor permeability, and can extend the shelf life of fruits and vegetables to 9 days. Currently, Mont Blanc Primeurs, which specializes in the production of organic, non-polluting foods, already uses this packaging to protect and set off their natural foods.
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