There is a food safety instruction packaging technology, which is a kind of plastic wafer that is doped with dyes. It can react with the gas released in the packaging bag to show if the meat and vegetables are deteriorating. After the plastic piece is placed in the food packaging bag, if the food in the packaging bag is rotted, gas is released and the plastic piece changes color. Consumers can know if the food is deteriorating based on the color of the plastic sheet. This intelligent packaging technology can only show consumers whether the food is deteriorating, while another smart packaging technology can control the environment inside the package and extend the shelf life of the food. Different fruits and vegetables need to be kept at a certain concentration of oxygen and carbon dioxide, and the concentrations of oxygen and carbon dioxide are difficult to control in sealed bags. Because when the temperature is high, the fruits or vegetables in the package will consume more oxygen and release more carbon dioxide. Without adjustment, the food preservation period will be shortened. To solve this problem, a company in Menlo Park, Calif., is working on a packaging film called Intelimer. When the temperature of the membrane changes, it will automatically change the permeability so that different foods are kept at the optimal oxygen and carbon dioxide concentration ratio. Another way to slow the rate of deterioration of foods is to use oxygen scavenger to remove oxygen and control the air environment within the bag to avoid oxidative deterioration of the food. At present, a common method is to put a small sachet containing iron powder in the food packaging bag, and consume the oxygen in the packaging bag through the iron powder. However, this method is obviously inadequate because the “inedible†warning signs on small sachets are likely to cause consumers to resent. To this end, a sealed gas company in New Jersey, USA, is producing a bag material that can remove oxygen itself. This material has an oxidizable polymer inner layer that traps and consumes oxygen inside the package like iron powder. Intelligent packaging technology can not only facilitate consumers to choose foods that are safe and secure, but also extend the shelf life of foods, and is conducive to the preservation and transportation of foods. It has broad market prospects. In the near future, the number of plastic bags produced using smart packaging technology will account for 20% to 40% of the total number of food film bags. Reprinted from: Foreign Plastics
Plastic bag smart packaging technology