plastic bag

Whether you like it or not, plastic packaging bags have become an indispensable ingredient in the food system. After we buy salads, sandwiches, and potato chips, we throw away the outer layer of plastic packaging immediately, which is really wasteful; however, it is this layer of plastic that keeps a lot of our food fresh during delivery. We never go deep into this point. Many plastic packaging allows us to eat while walking, or to taste the perishable cookies and fish from the other side of the earth. There are actually a lot of scientific principles and inventions hidden behind them. According to Aaron Brody, a food packaging consultant and associate professor of food science at the University of Georgia, the plastic revolution in food packaging began in the 1960s. So plastic is chosen because it is lighter than glass, stronger than paper, and cheaper. But Brody also pointed out: 'There is no universal plastic.' Many packaging bags we come into contact with are made up of different types of food packaging plastics. Take potato chip packaging bags as an example. Its main component is a kind of plastic called 'oriented polypropylene'. Brody explained: 'That is a good moisture barrier.' In the packaging of potato chips, moisture resistance is very important. 'Because potato chips absorb moisture, they will start to deteriorate. Wet potato chips will not Some people like it.” In order to further strengthen, many potato chip packaging bags also add a thin layer of aluminum on the inner layer. The product name and nutrition information are printed on the outer layer, and a layer of polyethylene (the material used to make plastic shopping bags) is sandwiched between the inner and outer layers. Brody also revealed that most companies inject nitrogen into the bag before it is sealed. 'This will prevent the potato chips from crushing.' Oxygen will oxidize the fat in the potato chips and produce a strange smell, but nitrogen will not cause any chemical reactions that destroy the taste. Brody also said that food companies often spend a lot of time designing packaging in order to best preserve every product they sell. This is what the military does. In previous reports, the Army used a kind of packaging to extend the shelf life of sandwiches to two years. Salad packaging bags are the same as potato chips packaging bags. The ready-to-eat vegetable salad packaging bags are also made of polypropylene and are also infused. A pack of nitrogen. Unlike potato chips, salad leaves need to breathe a little oxygen, which is why the salad packaging has small holes. Brody pointed out: 'The small holes allow oxygen to enter and carbon dioxide to escape.' He added that these packaging bags often have a thin anti-fog layer inside, 'so that condensation does not occur, and it also allows Consumers have seen beautiful green leaves.' When making many plastic packaging for ice cream buckets, manufacturers worry about not only how to keep the air out, but also how to keep water vapor inside. Brody, for example, said that this is very important in the packaging of ice cream. A bucket of ice cream must be easy to open and close, but it must also have a tight seal to keep the moisture inside, so as to maintain a smooth taste. When stored in the refrigerator, sublimation sometimes occurs, that is, the phenomenon of water directly changing from a solid state to a gas state. 'Once the sublimated moisture is lost, it cannot be recovered, and if the ice cream loses moisture, it will become sandy and agglomerate.' Brody said. He also pointed out that this is the reason why a layer of polyethylene is added to the paper bucket for ice cream. The high-end ice cream bucket is made of thick and sturdy materials. Of course, as food expert Herbert Stone (Herbert Stone) said, even after various research and development, most plastic packaging still cannot preserve food in extreme environments. Stone is a consultant in the food industry and the former chairman of the Institute of Food Technicians. Stone pointed out: “When food companies use plastic containers, they must ensure that they will not change the taste of food.” He added that plastic is not an inert material, it can react with other chemicals. And unlike many glass or metal products, it can also allow air to pass through. Have you left a plastic water bottle in a hot car for too long? Then it is mostly weird to drink. But the reason is different from what you think: it is not because the chemicals in the plastic seep into the water. Stone explained that a small amount of air can penetrate plastic, and when the temperature rises, the movement of the air will accelerate. Heat will also accelerate chemical reactions. When the chemicals in the bottle react with each other or with substances in the external environment, the water in the bottle will taste strange. Leave a bottle of soda in a hot car, and the carbonic acid in it will quickly escape from the bottle. 'All that's left is the soda that hasn't been soaked.
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