Can plastic wrap be heated? What is plastic wrap material?
Can plastic wrap be heated?
Plastic wrap to mark whether it can be heated
The new national standard formally implemented yesterday was “Food Self-adhesive Plastic Filmâ€. Compared with the 1989 standard, the new standard specifies that the PVC and PVDC food-preserving films be included for the first time in addition to the PE cling film. The new national standard has increased the technical requirements for raw materials. The requirements for the use of resins must be "food grade" raw materials; PVC cling film should be marked on the packaging with warning signs such as "Can't touch foods with fats" and "No microwave heating"; The cling film claims that it can be heated by microwave ovens and should be marked with “can be used in the microwave ovenâ€, heating method, and the maximum temperature-resistant temperature, otherwise it is forbidden to sell.
At the same time, the cling film packaging should be marked on the material or type of product, oxygen permeability, carbon dioxide permeability, moisture permeability. In addition to the length and width, the manufacturer shall clearly mark the thickness and net weight of the cling film on the packaging, and modify the length deviation in the original standard to the net roll weight limit deviation so as to avoid shortfalls.
Plastic wrap type
PE film: It is mainly used for food packaging. Its moisture resistance and air permeability are good. It is suitable for packaging short-term storage of peanuts, biscuits, fresh fruits and vegetables, frozen foods, etc. Semi-finished products purchased in supermarkets use this kind of packaging, but the temperature resistance Poor, so it should not be used at high temperatures.
PVC film: It can only be used in a limited way. It can be used for packaging vegetables, etc. It cannot be packaged directly with meat, cooked foods and fats and oils. It must not be heated by microwaves or used at high temperatures.
PVDC film: can be used to package cooked food, ham, etc. It has a slightly higher cost and the highest price. Transparency and heat sealability, good oil resistance and barrier properties, can be used at higher temperatures, high temperature within 140 °C.
Supermarket fresh-keeping film replacement packaging
This is related to the new national standard of human health. Is the family and restaurant often used? Yesterday, the reporter went to several large supermarkets and some restaurants in the urban area to conduct a series of visits and investigations.
In the Yuzhong District, Linjiangmen Zhongbai Supermarket, Jiefangbei Zhongbai Supermarket, New Century Supermarket Supermarket Liberation Monument Store, Yonghui Supermarket Bichangkoudian and other supermarket shelves, the brand has basically replaced the new packaging plastic wrap, old packaging products are gradually qiut the market.
Most of the plastic wrap in the supermarket is marked with the word “foodâ€, and the raw material is PE (polyethylene). The scope of application also indicates that it is suitable for the refrigerated preservation of common vegetables. When microwave heating is used, it is also reminded that the plastic wrap is sealed. Allow a gap or pierce the hole with a toothpick.
Improper use of PVC cling film can cause cancer
What is cling film material in the end? How can it be used? The cling film currently on the market can be divided into three categories.
The first is polyethylene, abbreviated as PE. The material is mainly used for food packaging, and most household plastic wraps sold in supermarkets are such materials;
The second is polyvinyl chloride, or PVC for short. The material can also be used to package vegetables, fruits, semi-finished products, etc., but it has a certain impact on human safety;
The third type is polyvinylidene chloride, abbreviated as PVDC, which is mainly used for the packaging of some cooked foods, hams and other products. However, the cost is high and the market is less.
The most common PE and PVC on the market have melting temperatures of 127°C and 120°C, respectively, whereas in microwave ovens the temperatures are often as high as 200°C-300°C, and cling film tends to melt into the food.
The difference is that PE is relatively safe in the melted material because it can be produced without adding any plasticizer. The PVC itself is a kind of hard plastic. To pull it into a transparent soft plastic wrap, a large amount of plasticizer must be added. Although PVC itself is non-toxic and harmless, plasticizers have harmful substances and may induce diseases. Therefore, PVC cannot be heated by microwaves and cannot be cooked.
In addition, PVC cannot touch grease foods. Plasticizer DEHA can be released at room temperature and penetrate into foods, especially with high fat content food compatibility. DEHA not only causes cancer, but also causes endocrine disorders, reduces male reproductive function, and even causes mental illness.
PE, PVC cling film three methods can be distinguished
The naked eye: PE material is poor in transparency, white in color, and the covered food looks unclear; PVC material has good glossiness, looks clear and thorough, and is slightly yellowish to light.
With hand-drawn: PE material is softer, but the toughness is poor, can be broken after stretching; PVC material has strong toughness, can greatly stretch and stretch but will not break, and easy to stick in your hand.
After being burned with fire: After the PE cling film is ignited, the flame is yellow, burning rapidly, and there is a burning smell of the candle; while the PVC cling film is fired with fire, the flame is yellow-green, there is no drip phenomenon, leaving the fire source will extinguish, and there is a pungent Odor.
Do not let plastic wrap come in contact with food when heating
If you do not use the cling film correctly, what harm will it cause to your body? Wang Hongling, a senior dietitian in Chongqing, said that using a PE film over the temperature range or using a PVC film under high temperature may cause the material to decompose and dissolve into the food. After eating, it will cause damage to human liver, kidney and other detoxification organs. After a large amount of material is accumulated in the human body, it may cause cancer.
Therefore, the public in the use of plastic wrap heating food, in addition to the use of a film can be heated, but also pay attention to the heating temperature, but also pay attention to do not let the film come into contact with food.
In addition, even if the PE plastic wrap is safer, its quality is also mixed. Some manufacturers have used industrial-grade or agricultural-grade PE membranes instead of food-grade PE membranes because of cost considerations. Therefore, citizens must look for the word “food grade†when they buy.
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