How to identify the safety of food plastics

2022-08-14
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How to identify the safety of food plastics

plastic has opened up a broad application prospect for food plastics because of its lightness, versatility, easy plasticity, firmness and durability. However, the safety problems brought by the rise of food plastics to human life and health cannot be ignored. In particular, food containers, tableware and packaging materials made of shoddy, shoddy or even indiscriminate use of toxic materials often lead to acute and chronic plastic poisoning. Therefore, it is very necessary to identify the widely used and colorful edible plastics

at present, China allows the production of meals for contact with food, which is the main use of electronic universal testing machine. There are four main types of plastics for utensils, food containers, tools, equipment and packaging materials: polyethylene, polypropylene, polystyrene and melamine. Although PVC is allowed to be used to produce food containers within the limits of monomer and purity, it is also stipulated that it must be produced with qualified excipients, and it is forbidden to be used alone. And there should be a written promise of quality assurance and maintenance of the external insulation system

in fact, it is not difficult to identify and recognize all kinds of edible plastics. Polyethylene and polypropylene are the most widely used and exposed materials. Plastic bags and buckets (including colored plastic buckets with milky white and similar hardness and toughness, plastic cups, plates, etc.) seen in daily life are mostly foamed plastic and non foam plastic, which are characterized by brittle chopsticks, spoons, etc. Melamine is mainly used in ceramic like plastic cups (white inside and dark outside), food dishes and containers, and there are few kinds

as for PVC, it is mostly used for solid texture, but the lining surface in contact with food must be compounded with polyethylene and other tableware without safety plastics. It is also popular because of its bright patterns and bright colors

there is also polyvinylidene chloride imported from abroad (which has not been approved in China), which is generally considered to be safe because it has been used internationally. Red sausage is often seen on the market, with smooth surface and fine cutting surface. Plastic packaging materials with two aluminum hoops at both ends are such

the above edible plastics used in tableware, containers, packaging materials and production equipment on food, as long as we understand their various plastic properties, physical and chemical characteristics and scope of use, taboos, generally speaking, are relatively safe, there will be no accidents, and there is no need to worry about causing plastic poisoning. However, shopping malls often find some kind of tableware containers with poor manufacturing, simple process and heavy color. Most of them are recycled plastics processed from recycled waste plastics, which are very harmful. The state has long prohibited the production of food utensils from recycled plastics according to the characteristics of the microcomputer controlled electronic universal testing machine of Jinan testing machine. The reason is also very simple, because its source is complex, and it has not been cleaned or chemically treated, so it is more dirty and toxic, Moreover, recycled waste plastics tend to age and change color. In order to cover up the change in color, most of the pigments containing toxic materials are added during re dissolution production, and their products have successively achieved breakthroughs in the field of packaging materials. The color of the products is dark brown, even dark green. If such plastics are used to hold oil or high-temperature food, it is very easy to dissolve toxic oil by-products (dioxins, etc.) and harmful pigments, which have potential hazards of carcinogenesis, teratogenesis and mutagenicity to people, and the risk is even greater. Therefore, people should have scientific knowledge about the identification and safe use of food plastics to avoid the occurrence of toxic plastic poisoning accidents

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