The hottest PVC fresh-keeping film is not so terri

2022-09-21
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PVC cling film is not so terrible, DEHA can be used reasonably

How can plasticizer components dissolve out of greasy food wrapped with cling film? The CCTV weekly quality report column reported that the agency detected 16 kinds of PVC fresh-keeping film samples in Beijing, Shanghai and Guangzhou and found that 15 kinds contained the banned plasticizer DEHA ester), of which the minimum detection limit exceeded 0.05% by 98 times, the maximum detection limit exceeded 472 times, and the average detection limit exceeded 200 times

this news is like a blockbuster, causing public concern. The survey found that although the General Administration of quality supervision, inspection and Quarantine of the people's Republic of China explicitly requested the delisting of PVC fresh-keeping films containing DEHA in 2005, DEHA was a legal additive in the GB hygienic standard for the use of impermeable and transparent plastic additives in food containers and packaging materials, which was issued in 2008, and the maximum amount of DEHA used was no more than 35%. Experts pointed out that it was obviously confusing for institutions and media to talk about the detection limit, as long as they paid attention to the method when using it, PVC cling film is not so terrible

According to CCTV's weekly quality report, Ms. Bi, a Beijing citizen, found that the cooked meat bought from the supermarket had been put away for a few days, and there was something oily on the plastic wrap. Yang Weimin, an expert member of the training expert committee of China Packaging Federation, explained that the unknown greasy substance found by Ms. bi was probably the plasticizer contained in PVC fresh-keeping film

Beijing keyvia environmental protection technology consulting center purchased 16 brands of PVC fresh-keeping films on the market from Beijing, Shanghai and Guangzhou respectively, and sent them to the national authoritative testing institutions. It was found that 15 of them contain the nationally banned plasticizer DEHA, of which the minimum detection limit is 98 times higher than 0.05%, and the maximum detection limit is 472 times higher than 23.6%, On average, it exceeds the detection limit by more than 200 times, that is, about 10%

visited a large shopping mall in Xinzhuang, and found no PVC preservative film in the preservative film area. Most brands use materials marked as PE. The package of a 30 cm 20 m fresh-keeping film says that the heat-resistant temperature is 110 ℃

the person in charge of a fresh-keeping film manufacturer in Yiwu surnamed Wang said that there are many kinds of fresh-keeping films. Generally, PE is mostly sold in supermarkets, but many cooked food packaging stores like PVC because PVC is brighter and more transparent. In terms of price, the price of PE and PVC fresh-keeping film with the same thickness has little difference in the role of flame retardance and smoke elimination in the polymer system. PE is even cheaper than PV, except that it feeds back the supervision and spot check results to the publishing unit and the local competent department

Wang Quanrui, a professor in the Department of chemistry of Fudan University, pointed out that PVC is a polymeric substance with high hardness. To make it flexible and elastic, plasticizer must be added. DOA and DEHA mentioned in CCTV report are isomers. De HA is not as stable as DOA, and it is easier to release when encountering high temperature and high fat content foods

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