Cling to keep the film, you may use the wrong!

The market "looks like one thing" in the market

What are the differences in plastic wrap?

How to use it to "keep fresh"?

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Different functions of different materials

Researcher Zhong Kai, director of the Center for Health Food and Health Information Exchange Center, said in an interview with the China Consumer Daily that the preservation film sold on the market can be divided into three categories according to the material:

01. PE (polyethylene) plastic wrap film

Most of the supermarkets are sold. It has good waterproof and breathable, especially suitable for packaging fresh fruits and vegetables, frozen foods, etc.

But it is precisely because of its good breathability, so it is not suitable for foods that are easy to pack high oil and are prone to damage to the flavor of oxygen, such as pastry, cooked food, etc.

PE can be used for freshness in the refrigerator, but cannot be used for microwave heating.

02, PVC (polyvinyl chloride) plastic wrap film

Common market for wholesale markets, farmers' markets and online.

The advantages are good transparency, high viscosity, and good elasticity. The disadvantage is that the heat stability is poor. At high temperatures, it will release a plasticizer that is not friendly to human health. Therefore, it is not possible to pack meat, cooked food, oil foods, etc., especially at high temperature conditions.

At present, this plastic wrap is mainly used to pack vegetables and some agricultural products at room temperature.

03. PVDC (polytinyl chloride) plastic wrap

It has the characteristics of good freshness, strong and easy to stick, and can prevent water evaporation. It is mainly used for packaging and preservation of foods such as meat, cooked food, ham and other foods.

The most important thing is that because its use temperature range is between -60-140 ° C, it can be used for freshness and microwave heating.

However, the cost of preservation film is high, the processing is difficult, and the market share is not high.

Explanation:

Compliance products ensure safety

"Plastic membrane will not only accelerate bacterial reproduction, but also may cause cancer." For a long time, such a statement is the main reason why many people alienate plastic wrap.

Zhong Kai analyzed and explained that as a product that can be directly contacted with food, the safety of qualified plastic wrap is not required.

01 The role of plastic wrap is to suppress rather than release or breeding microorganisms such as bacteria.

Most of the microorganisms such as bacteria in food come from the food itself, resulting in the three types of foods covering plastic wrap, which is more than bacteria and faster corruption:

First, food has been invaded by microorganisms before covering plastic wrap;

Second, the preserving environment is not clean or the temperature is too high;

Third, the preservation film itself is stored or used properly, such as more dust storage, reuse, poor hand hygiene, etc.

For example, Zhong Kai said that the overnight watermelon that covered the plastic waters caused severe gastrointestinal discomfort, which seemed to be an empirical evidence of "plastic wrap accelerated bacterial reproduction", but in fact, using clean chopping boards and knife -cut watermelons, clean fresh preservation in time with fresh preservation After the membrane is covered, the classification is stored in a clean and orderly refrigerator, which cannot cause bacteria to breed rapidly. If there is a problem, it must be that the watermelon is contaminated from the process of opening to storage.

02 As long as it is a plastic wrap that meets relevant national standards, it will not cause harm to health.

The most controversial and most easily caused by plastic wrap is the problem of plasticizers (also known as plasticizers) in the PVC material.

The reason for the use of plasticizers is because the softness of plastic wrap is needed, but some studies have said that the human body has a long -term contact with plasticizer, which may have anesthesia, teratogenic and even hidden dangers of carcinogenic.

Zhong Kai analyzed that the World Health Organization listed the "phthalate" substances in plasticizers as 2B carcinogens, and 2B carcinogens were proven to have carcinogenic effects on animals, but the carcinogenic effect on people did not clear. The World Health Organization believes that a 60 kg -weighed adult consumes no more than 1.5 mg of "phthalate" substances per day, which is safe.

Nevertheless, my country's "Food Safety Standard Food Materials and Products Use Adding Preparation Standards" (GB9685-2016) and other national standards and related regulations of the use of plasticizers and the total amount of plastic wrap (including "phthara acid acid Escin "and other strict limits of the quality of the food contact with food contact) have been made. In other words, as long as it is a plastic wrap that meets relevant national standards, it will not cause harm to health.

use

The method is proper to worry -free

Zhong Kai said that it is best to use glass, ceramics or microwave oven containers for heating food. If you really need to cover the container with plastic wrap, you should pay special attention to the following points:

01 does not indicate the plastic wrap film that is applicable to the microwave oven, and it must not be used in the microwave oven.

The maximum heat -resistant temperature marked by different brands of high temperature -resistant plastic wrap is different. Try to choose as much as possible in the preservation film, and the use time should not be too long.

02 Keep a certain distance from food.

In fact, regardless of whether it is used for heating, it is recommended to use plastic wrap and deeper container to use, that is, at least two centimeters from the plastic wrap from the food, let the plastic wrap only contact the container instead of the food itself.

Especially for foods with large oily properties, the plastic wrap can be damaged after heating and adhesion with food.

03 Put a few small holes with a dental visa.

Before heating, you can use a toothpick and other small holes on the plastic wrap, which is conducive to the evaporation of water vapor. Otherwise, it is easy to cause plastic wrap blasting due to gas expansion and even cause danger.

when using it

Also pay attention to the following points

Do not cover the plastic wrap.

Because when the vegetables are hot, it is covered with plastic wrap, not only cannot keep the vitamin C in the vegetables, but it will increase its loss. You can choose heat -resistant glass, porcelain plates, etc. instead of plastic wrap to cover food.

No matter what kind of materials, it is not advisable to contact alcoholic foods, and it is not advisable to wrap foods such as cooked food and meat with greater oily food for a long time.

Wrap fresh fruits and vegetables with plastic wrap. PVDC plastic wrap can provide longer fresh -keeping time because it has better moisturizing. However, it is recommended to not exceed 12 hours. The role of plastic wrap is short -term preservation, not long -term storage.

The bags that are bought back from the supermarket are fruits and vegetables with plastic wrap.

If it is kept in fruits and vegetables with refrigerated or freezing, first isolate with clean paper towels, and then use plastic wrap to keep fresh in the outer layer. It is the safest principle of use.

Not all vegetables and fruits can use plastic wrap. Some research tests show that apple, pear, rapeseed, leeks, lettuce and other fruits and vegetables with large water preservation are kept fresh, which can not only keep fresh for a long time, but also increase nutrients such as vitamin C. And radish, cucumber, bean horns, etc. use plastic wrap and keep fresh, but the nutritional losses are very large.

Buy a little trick

Look at the material

The material can be assisted according to the color, whether it is easy to rub and other methods. Generally speaking, the plastic wrap film that is not easy to open on the surface is made of PVC. The plastic wrap film of PE material is white.

Family uses plastic wrap. It is recommended to choose PE material.

Look at the appearance

Choose a plastic wrap that is intact, flat on the surface, no bubbles, no perforation, no rupture, no impurities, and no foreign objects to facilitate use.

Pay attention to the date of production and shelf life. The packaging bag is damaged or exceeded during the shelf life, and there may be bacteria and mold breeding.

There is no odor in the plastic wrap that qualified in the smell. The flavored plastic wrap will not only skewer with the food, but also affect food safety. It should be avoided in purchase and use.

Check

Pay attention to whether there are QS logo and production license number on the product packaging.

Source: China Consumer News · China Consumer Network

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