Germany has recently developed a technology to add anti-corrosion and anti-bacterial coatings to plastic packaging films and has been approved by experts. It can completely replace the preservatives added in food packaging and is very effective in anti-mildew foods. This coating technology uses a composite resin and other substances as the base material and is realized by a special process. Coatings can prevent bacteria from multiplying at the contact points of foods and packaging and achieve antibacterial effects. The use of liquid beverages such as milk is promising.