Getting rid of oxygen in the food’s atmosphere within the packaging means the product’s spoilage process is substantially delayed. Oxygen will allow food to decay by developing a helpful, hospitable setting for microorganisms. Most substantial barrier movies are multi-layered buildings, combining two or three plastics to accomplish the barrier. https://www.linpack.com/news/why-food-packaging-machine-manufacturers-are-vital-to-the-global-supply-chain