The carrageenan film developed by Japan Mitsubishi Rayon Co., Ltd. is made from natural polysaccharides extracted from red algae. It is translucent, tough, and heat sealable. In addition, there are some types of edible protein films, such as milk protein, casein, corn linoleic eggs, and newly developed edible packaging films with antibacterial functions, such as adding lysozyme or vitamins to zein or soy protein single films. Such antibacterial ingredients can control the growth of pathogens in foods and food spoilage caused by microorganisms. In the printing of food packaging, there has been a flexographic printing technology; this new pollution-free printing technology has the characteristics of not containing benzene, heavy metal products, non-toxic, odorless, non-emission of toxic gases, odorless residues of prints, etc. At present, 80% of US product packaging adopts this technology.