With the continuous development of the plastics industry, plastic packaging has long been integrated with food and has become an indispensable member of the food system. If the plastic packaging is removed, the food will be difficult to store for a long time, and it is difficult for consumers to eat foods thousands of miles away.
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The plastic has small density, light weight, transparent or opaque, and is easy to be shaped and processed. As long as the mold is replaced, different kinds of containers are obtained, which is easy to form mass production. However, it also has many shortcomings, such as: plastics are easy to deform at high temperatures, the surface hardness is low and easy to wear; under light and thermal oxygen, it will degrade and become brittle; the conductivity is poor, it is easy to generate static electricity accumulation and even pollution. But despite this, it has brought great convenience to our lives.
If there is no plastic packaging, the food system will be hit hard.
Aaron Brody is a food packaging consultant. According to him, the plastic revolution in food packaging began in the 1960s. So plastic is chosen because it is lighter than glass, firmer than paper, and cheaper. But he also pointed out: "Universal plastics do not exist." Many of the bags we come in are made up of different types of food packaging plastics.
We can see a variety of plastic packaging forms in our lives, the following are common:
Potato chip bag
Its main ingredient is a plastic called “oriented polypropylene.†Brody explained: “That is a good moisture barrier. "In the packaging of potato chips, moisture protection is very critical," because the potato chips will absorb water vapor and will begin to deteriorate. Wet-answered potato chips are not something that people like. For further reinforcement, many potato chip bags also have a thin layer of aluminum on the inner layer.
The trade name and nutritional information are printed on the outer layer, and a layer of polyethylene is sandwiched between the inner and outer layers. 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, producing a strange smell, while nitrogen does not cause any chemical reaction that destroys the taste.
Salad bag
Like the potato chip bags, the ready-to-eat vegetable salad bags are also made of polypropylene and are also filled with a pack of nitrogen. Unlike potato chips, salad leaves need to breathe a little oxygen, which is why there are small holes in the salad bag. Brody pointed out: "The small holes allow oxygen to enter and the carbon dioxide can be discharged." He added that the inside of these bags often has a thin layer of anti-fog, "so that condensation does not occur, and Consumers see beautiful green leaves."
Ice cream bucket
When making many plastic packages, manufacturers are not only worried about how to isolate the air, but also how to keep the water vapor. For example, Brody said, 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 that locks in moisture to maintain a smooth mouthfeel.
When stored in a refrigerator, sublimation sometimes occurs, that is, the phenomenon that water directly changes from a solid to a gaseous state. "If the water of sublimation is lost, it cannot be recovered, and if the ice cream loses moisture, it will sand and agglomerate," Brody said. Of course, even after various research and development, most plastic packaging still can't preserve food in extreme environments. Food companies must ensure that they do not change the taste of the food when using plastic containers. Plastic is not an inert material that reacts with other chemicals. And unlike many glass or metal products, it also allows air to pass through.
Plastic water bottle
Have you ever put a plastic water bottle in a hot car for a long time? It is mostly strange to drink it. But the reason is different from what you think: this is not because the chemicals in the plastic have penetrated into the water. In fact, a small amount of air can penetrate the plastic, and when the temperature rises, the movement of the air will also accelerate. Heat also accelerates the chemical reaction. When the chemicals in the bottle react with each other or react with substances in the external environment, the water in the bottle will smell strange.
Leave a bottle of soda in the hot car and the carbonic acid will quickly escape from the bottle. The rest is the soda that has no bubbles. Plastic is really convenient, but it is not omnipotent.
In addition to technical limitations, all of the plastic packaging we use today produces a lot of trash. In 2012 alone, the United States produced 14 million tons of plastic waste that used to be bags and containers. Plastics cannot be easily biodegraded, so they sometimes enter the ocean, which not only harms the creatures in the sea, but also pollutes the seafood.
Although many types of plastics are already recyclable, bright packaging containing multiple layers of plastic is difficult to recycle because different types of plastic are treated separately in the recycling station.
Plastic food packaging brings convenience to people's daily lives, but it also brings a lot of pollution. Therefore, it is extremely urgent for food packaging manufacturers to learn to use the advanced production technology to transform green health.
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