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PET film is widely used in food packaging because of its excellent physical and chemical properties, such as high strength, good transparency, non-toxicity, good barrier properties and excellent electrical insulation properties. However, its monomers and catalysts and other auxiliaries, including by-products, are somewhat highly toxic and present a risk of migration. Countries around the world have established corresponding standards for PET hygiene requirements for food contact.

European Union (EU) NO 10/2011 Plastic materials and products intended to come into contact with food

The special migration of monomers and additives in PET, monomers and additives and by-products in PET is limited in (EU) NO.10/2011.

Among them, sputum is a highly toxic metal (acute toxicity: abdominal cavity-rat LD50: 100mg/kg; abdominal cavity-mouse LD50: 80mL/kg), the toxicity of sputum depends on its chemical structure and oxidation state, trivalent cesium is lower than pentavalent 锑More toxic.

The special migration test for cockroaches in the EU regulations uses the following simulated fluids: 3% acetic acid (B), 20% ethanol (C), and olive oil (D2).

For foods that are hydrophilic and capable of extracting hydrophilic substances, food simulants A, B and C are used; foods below pH 4.5 are used for simulant B; alcoholic foods with an alcohol content of not more than 20% and those containing certain The amount of the organic component, the food exhibiting more hydrophilicity was simulated C; and the food containing free fat on the surface was simulated D2. The sample and the simulated contact time and temperature select the worst conditions of use.