Which vegetables cannot be wrapped in plastic wrap? How to prevent plastic wrap from curling?

Contents of this article

1. Which vegetables cannot be wrapped with plastic wrap?

2. How to prevent the plastic wrap from curling?

3. How to choose plastic wrap

Which vegetables cannot be wrapped in plastic wrap?

Cling film is a plastic packaging product, usually made by polymerization reaction with ethylene as the masterbatch. It is mainly used for heating food in microwave ovens, preserving food in refrigerators, packaging fresh and cooked food, etc. It is widely used in family life, supermarkets, hotels and restaurants, and food packaging in industrial production. According to the materials used and the added plasticizers, cling film is divided into many types and can be used in different occasions. Cling film is favored by people for its convenience, economy and beauty. However, due to the widespread addition of plasticizers in the production process, the impact of cling film on human health has also attracted people's attention.

Apples, pears, rapeseed, leeks and other fruits and vegetables with high water content are suitable for plastic wrap. Using plastic wrap on these fruits and vegetables can not only keep them fresh for a long time, but also increase some nutrients in them. In this study, American scientists found that 100 grams of leeks wrapped in plastic wrap had 1.33 mg more vitamin C after 24 hours than when they were not wrapped, and rapeseed and lettuce leaves had 1.92 mg more.

But the experimental results of radish, cucumber and beans were completely opposite. After 100 grams of radish wrapped in plastic wrap was stored for one day, its vitamin C content decreased by 3.4 mg, beans decreased by 3.8 mg, and cucumbers lost the same amount of vitamin C as 5 apples after being stored for a day and a night.

Cooked food, hot food, food containing fat, especially meat, should not be stored in plastic wrap. When these foods come into contact with plastic wrap, the chemical components in the plastic wrap material will volatilize and dissolve into the food, causing harm to health.

In addition to plastic wrap, the main food packaging products on the market are fresh-keeping boxes and fresh-keeping bags. In terms of "water retention", "quality preservation" and "nutrient preservation", plastic wrap is undoubtedly the best. But for foods that are not suitable for plastic wrap, fresh-keeping boxes or fresh-keeping bags can be used instead.

Why doesn't the plastic wrap curl?

You can fix the two ends of the plastic wrap with plastic tape to prevent the plastic wrap from curling. The plastic wrap has a certain stickiness and carries an electric charge, so it will produce an adsorption effect, but the plastic wrap cannot be attached to the metal container because the metal is a conductor and can make the charge of the plastic wrap disappear.

Cling film is a very common plastic product in our daily life. It is generally used to keep food fresh. The edges of the food will curl after being wrapped in cling film. This is a normal phenomenon and does not affect the quality of food preservation. If patients with obsessive-compulsive disorder really can't stand it, they can just use tape to stick the two ends of the cling film together.

The plastic wrap has a certain degree of stickiness and a soft texture. The inside of the plastic wrap is charged, so it will produce adsorption, which is similar to static electricity. The plastic wrap sticks to the surface of the container and acts as a seal, thus keeping the food fresh.

However, plastic wrap will not stick to metal containers because metal containers are conductors, which will cause the charge on the plastic wrap to disappear and the natural adsorption function will also disappear, so plastic wrap can only be used with insulators.

How to choose plastic wrap

1. Look at the color. The yellowish plastic wrap is made of PVC, and the white one is PE.

2. Touch inspection: PE cling film is easy to open after rubbing with hands, while PVC cling film has good viscosity and is not easy to unfold by rubbing with hands.

3. Burn it. PE cling film is flammable, while PVC cling film is not flammable. It will go out after leaving the fire source and has a pungent odor. Of course, the easiest way is to look at the ingredient label on the cling film packaging.