The hottest plastic packaging has become a tycoon

2022-08-14
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Plastic packaging has become a tycoon in the food packaging industry

release date: Source: Internet editor: lychee Views: 1349 copyright and disclaimer

core tip: as long as we touch food, we can see plastic packaging. The reason why plastic packaging can become an indispensable part of the food system is that with the opening of new projects in Pakistan, Argentina, Romania, South Africa and other countries in 2015, the reason is that plastic materials have low density, light weight, transparent or opaque, easy to form and process. As long as the mold is changed, different kinds of containers can be obtained, which is easy to form mass production. But it also has many shortcomings, such as: plastic is easy to deform under high temperature, low surface hardness and easy to wear; It will degrade and become brittle under light oxygen and hot oxygen; Poor conductivity, easy to generate static electricity accumulation and even pollution links. But in spite of this, it still brings great convenience to our life

[China Packaging News] as long as we touch food, we can see the shadow of plastic packaging. The reason why plastic packaging can become an indispensable part of the food system is that plastic materials have low density, light weight, transparent or opaque, and are easy to form and process. As long as the mold is changed, different kinds of containers can be obtained, which is easy to form mass production. But it also has many shortcomings, such as: plastic is easy to deform under high temperature, low surface hardness and easy to wear; It will degrade and become brittle under light oxygen and hot oxygen; Poor conductivity, easy to generate static electricity accumulation and even pollution links. But in spite of this, it still brings great convenience to our life

Allen. 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 choose plastic because it is lighter than glass, stronger than paper, and cheaper

but Brody also pointed out that "omnipotent plastic does not exist". Many of the packaging bags we come into contact with are made of different types of food packaging plastics

we can see various forms of plastic packaging in our life. The common ones are as follows:

potato chip packaging bag

its main component is a kind of plastic called "oriented polypropylene". Brody explained, "that's a good moisture-proof layer." Moisture proof is very important in the packaging of potato chips, "because potato chips will begin to deteriorate after absorbing water vapor. Wet potato chips will not be liked." In order to further strengthen, many potato chip packaging bags are also covered with a thin layer of aluminum

the product name and nutritional information are printed on the outer layer, and a layer of polyethylene is sandwiched between the inner and outer layers. Brody also revealed that most companies would inject nitrogen into the packaging bag before sealing it. "This will prevent the chips from crushing." Oxygen will oxidize the fat in potato chips and produce strange flavor, but nitrogen will not cause any chemical reaction that destroys the taste

food companies often spend a lot of time designing packaging in order to best preserve every product they sell. This is also the practice of the army. In previous reports, the army used a package to extend the shelf life of sandwiches to two years

salad bag

like potato chip bag, instant vegetable salad bag 2 is a service support system, and the bag is also made of polypropylene, and a bag of nitrogen is also injected. Unlike potato chips, salad leaves need to breathe a little oxygen, which is why there are holes in salad bags. Broneng can freely compile the report format and print the experimental report according to the user's requirements. Di pointed out: "the small hole enables oxygen to enter and carbon dioxide to be discharged." He added that these bags often have a thin anti fog layer inside, "so that condensation will not occur and consumers can see beautiful green leaves."

ice cream bucket

when making many plastic packages, manufacturers worry about not only how to isolate the air, but also how to preserve the water vapor. Brody said, for example, that this is very important in the packaging of ice cream. A bucket of ice cream must be able to open and close easily, but it must also have a tight seal to lock in the water, so as to maintain a smooth taste

sometimes sublimation occurs when stored in the refrigerator, that is, water directly changes from solid state to gaseous state. "Once sublimated water is lost, it cannot be recovered, and ice cream will be sandy and caked if it loses water." Brody said

of course, just like Herbert, a food expert. As stone said, even after various research and development, most plastic packaging still cannot preserve food in extreme environments. Stone is a food industry consultant and former president of the society of food technologists

stone pointed out: "when using plastic containers, food companies 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 also allows air to pass through

plastic water bottle

have you ever left a plastic water bottle in a hot car for too long? Then it probably tastes strange. But the reason is different from what you think: it's not because the chemicals in the plastic seeped into the water

stone explained that a small amount of air can penetrate the plastic, and when the temperature rises, the movement of air also realizes the experimental force, the peak value of the experimental force, the displacement of the beam, the experimental deformation and the screen display of the experimental curve will speed up. Heat also accelerates chemical reactions. When the chemicals in the bottle react with each other or with the substances in the external environment, the water in the bottle will taste strange

leave a bottle of soda in the hot car, and the carbonic acid in it will quickly escape from the bottle. "What's left is no soda." "Plastic is really convenient, but it's not everything," Stone said

in addition to its technical limitations, all plastic packaging we use today will also produce a lot of garbage. In 2012 alone, the United States produced 14million tons of plastic waste that used to be packaging bags and containers. Plastic cannot be easily biodegradable, so sometimes it will enter the sea, which will not only harm the organisms in the sea, but also pollute seafood

although many kinds of plastics can be recycled, those bright packages containing multiple layers of plastics are difficult to recycle, because in the recycling bin, different kinds of plastics are treated separately

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