Research on the recycling symbol at the bottom of

2022-07-27
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Research on recycling symbols at the bottom of plastic bottles for food packaging

[ppzhan Abstract] water cups, mineral water buckets, plastic tableware, beverage bottles and baby bottles are prone to damage. These plastic products can be seen everywhere in our life, or heated or reused for a long time. As everyone knows, these living habits imply deadly killing, and the mystery is hidden in the figures at the bottom of the plastic bottle

each number from 1 to 7 of the digital identification represents a type of material. If the product is made of several different materials, the identification is its main material. This annotation method originated in the United States and has been accepted and cited by many countries, including China. Although this marking method is mainly for the convenience of plastic recycling, consumers can also know what materials are used for the plastic products, what uses they have, and what environment they should use them in

the numbers in the triangle with arrows represent different meanings:

1 pet (polyethylene terephthalate), which will produce carcinogens after 10 months of use

2 HDPE (high density polyethylene) is difficult to clean and easy to breed bacteria

3 PVC (polyvinyl chloride) is easy to produce carcinogens in case of high temperature and grease

4 LDPE (low density polyethylene) is easy to produce harmful substances under high temperature

5 PP (polypropylene), special material for microwave oven lunch box

6 PS (polystyrene), heat and cold resistant, can not be used in microwave

7 PC and other types are used to make milk bottles and space bottles. However, this kind of water cup is easy to release toxic substance bisphenol A at high temperature, which is harmful to human body. Do not heat the water cup when using it. Do not dry it in the sun

consumers can judge whether a bottle can be reused from the bottom of the bottle or BASF's contribution to Landsea projects in Shanghai, Wuxi, Hangzhou, Nanjing, Shaoxing, Chengdu, Wuhan and other places, which are obviously affected by the paper industry's capacity reduction, G20 production suspension and restriction, and the environmental tide. If it is used for packaging food, it is also necessary to select qualified plastic bottles with quality and safety assurance, i.e. QS certification. Under the specified use conditions, consumers can use them with confidence. However, for bottles without reusable graphics at the bottom or obvious position, such as common mineral water bottles or unmarked bottles, consumers are advised not to reuse their food. If it has been reused, it should be filled with low oil and low acid food at low temperature and stopped using as soon as possible. Visiting supermarkets and shopping malls, it is almost difficult to find reusable plastic containers

plastic bottles are not allowed to be used as food packaging after recycling, otherwise the quality supervision department will immediately cancel the production license of relevant manufacturers once they are found. As some properties of plastic bottles have been changed during recycling, it is difficult to further expand the brand awareness of plastic bottles, which are mostly used to produce non food container products

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