The hottest little plastic University asked

2022-07-27
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A small plastic University asked a colleague, Dan Dan, who was so busy that he forgot to eat at noon. When he remembered, the meal he ordered was already cold. She picked up the lunch box and prepared to put it in the microwave oven. I quickly stopped her. Pointing to the triangle box at the bottom of the lunch box and the "06" number in the middle, Miss Gao gave her a popular science on plastic signs

what is the plastic recycling mark

colleague Dandan was so busy that he forgot to eat at noon. When he remembered, the meal he ordered was already cold. She picked up the lunch box and prepared to put it in the microwave oven. I quickly stopped her. Pointing to the triangle box at the bottom of the lunch box and the "06" number in the middle, Miss Gao gave her a popular science on plastic signs

what is the plastic recycling mark

this small recycling logo is like the ID card of each plastic product. Different materials make different uses. Now let's talk about it in detail

"01": pet (polyethylene terephthalate)

is very common. Mineral water bottles and beverage bottles are generally made of this material. The maximum heat resistance of this material is 70 ℃, so it is only suitable for warm or cold drinks. When it is filled with high-temperature liquid or heated, it is easy to deform, and substances harmful to human body may dissolve out. Therefore, it is recommended to throw away the mineral water bottle and beverage bottle as soon as they are used up. Do not use them as water cups or to hold other food

"02": HDPE (high density polyethylene)

is generally used as a plastic container for shampoo, laundry detergent and other cleaning products. Most plastic bags used in supermarkets are made of this material, which can withstand 110 ℃ high temperature. Those marked for food can also be used to contain food. Some people often buy large bottles of detergent and detergent, and then pour them into small bottles. It is really convenient, but it is also recommended that small bottles should also have their experimental tooling. In principle, sprouts and actual use should be replaced frequently, which is easy to breed bacteria after a long time

"03": PVC (polyvinyl chloride)

is generally used for raincoats and suction cups, and no one uses it as food packaging. It is also worth noting that some children's toys are also made of PVC. Parents should pay attention to whether the brand is strong when buying. The problem comes from the monomolecular vinyl chloride and plasticizer that have not been fully polymerized. If they are easy to separate out at high temperature or grease, they may have the risk of cancer. Therefore, it should be borne in mind that PVC toys, like electric pull toys, must not be heated when there are load, displacement, deformation and other detection links

"04": the most commonly used LDPE (low density polyethylene)

is cling film. PE is not heat-resistant. When the temperature exceeds 110 ℃, hot melting will occur, leaving some plastic preparations with molecular structure that cannot be decomposed by the human body. So don't put it in the microwave

"05" -- PP (polypropylene)

set without affecting the experimental results

it is widely used in the food field and can withstand 130 ℃ high temperature. Qualified fresh-keeping boxes are generally made of PP and can be used repeatedly. Remember, this is the only plastic box that can be put into the microwave oven. However, it should also be noted that some microwave oven lunch boxes have PP bodies and 06 polystyrene covers, so you should also see clearly before heating. To be on the safe side, do not heat them together with the covers

"06": PS (polystyrene)

is mentioned at the beginning. It is generally used to make disposable lunch boxes. Although it is heat-resistant and cold resistant, some chemicals may precipitate under high temperature. Therefore, it is necessary to avoid using disposable lunch boxes to pack hot food. And acid or alkaline substances may also precipitate bad substances, so pay attention to distinguish them when loading

"07" -- PC and other types of

pc are more widely used, especially in manufacturing milk bottles, space cups, etc. But it is controversial because of bisphenol A. Theoretically, as long as bisphenol A is 100% converted into plastic structure in the process of making PC, it means that the product is completely free of bisphenol A, let alone released. Therefore, when purchasing, try to choose PP products with guaranteed big brands

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