The UK's "Nature News" magazine published a new development in materials science on the 11th: scientists at the University of Oxford in the UK have developed a completely recyclable, very safe transparent film that can even replace existing metal coatings for food packaging. Composite material. The film uses a new environmentally friendly manufacturing process that is easier to recycle than the materials used in the industry today.
A key requirement in today's economic development is to extend the shelf life of food as much as possible while meeting food safety. But unfortunately, there are serious environmental problems in the current food packaging methods. In view of the need for sustainable development in the future, people's requirements for packaging are not only “recyclableâ€, but also “recyclable recyclingâ€, and the current common composite materials containing metal coatings are extremely inadequate in this respect – - It provides a barrier that is critical to the preservation of food, but it is extremely difficult to separate and recycle.
Therefore, Oxford University scientist Dermot O'Hare and colleagues have developed a recyclable environmentally friendly film that can replace the metal coating used in current food packaging while providing a similar level of protection for food. .
The film synthesized by the research team consists of layered double hydroxide (an inorganic material). The production process is cheap and green, and the required materials are water and amino acids. The resulting film is transparent and can block oxygen and water vapor like a metal coating while being relatively strong. Since the film is synthetic, its composition is completely controllable, which greatly enhances their safety when in contact with food.
The research team said that at present, the film has met the safety standards for food contact materials, and further testing is needed at this stage to be practically used in food packaging on the market.
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