Recently, the media reported that the General Office of the State Council of China recently issued to the people’s governments of provinces, autonomous regions and municipalities directly under the Central Government, the State Council ministries, commissions and agencies directly under the State Council “on the production and sale of plastic shopping bags to limit the use of the notice. The notice points out that since June 1, 2008, in all supermarkets, shopping malls, marketplaces and other retail venues to implement a system of paid use of plastic shopping bags, no free plastic shopping bags. Plastic bags are convenient and easy to use, so that it penetrates every aspect of our daily lives. Plastic bags provide convenience at the same time, in addition to the impact on the environment, but also endanger our health. Home life, people almost every day to the market to buy food, whether it is a handful of vegetables, a fish, or hot steaming buns, we have been accustomed to plastic bags to packaging. These food bags are both lightweight and convenient, very convenient, but have you ever thought about the safety of these plastic bags? Food packaging bags made of a variety of materials, there are different colors, shapes and sizes, the original purpose of food packaging bags is to protect the food inside from external contamination. But as fast food becomes more popular, food packaging bags have also become the container before the food is cooked, bagged food is often placed in the microwave and oven cooking or put into boiling water to heat. When the bag as a cooking appliance, under the effect of high heat, the bag on the unhealthy ingredients will seep into the food, long-term, will bring harm to the body. Therefore, experts believe that, in the face of a wide variety of plastic products on the market, in addition to learn the corresponding knowledge of poison prevention methods, should also pay attention to improper use of methods for health risks, such as microwave heating plastic bowls for food, long-term use of disposable plastic cups for drinking water and other methods will damage health. 1, emitting “poisonous gas” plastic bags used in the grocery store plastic bags, generally emitting “poisonous gas”. These plastic bags are harmful, the key is no longer PVC material – as they are obviously processed from recycled waste plastic, so if the “predecessor” is a food bag even, the problem is that you simply do not know what plastic it is made of — containing pesticides, drugs, and even highly toxic chemicals, which are mixed in the plastic bags can not be removed in the back of the processing, accidentally on the vegetables and fish and shrimp. Plastic bags made of polyethylene and polypropylene, both safe to hold food. Both plastic bags are with a bit of foggy white – such as supermarkets with fruits and vegetables with plastic bags, used for bulk preserves, soft plastic bags with sealing grooves, are made of these two materials. Another BOPP safety plastic bags are transparent, hard texture – common with bread packaging bags, can also be used safely. Touch of PVC plastic bags, do not let it and food “close contact”. Preventive measures: (1) promote the use of vegetable baskets, both environmentally friendly and hygienic. (2) learn to identify toxic plastic bags. The following methods can help you distinguish between safe food bags: ① sensory testing method: non-toxic plastic bags are milky white, translucent, or colorless transparent, flexible, feel lubricated, the surface seems to have wax; toxic plastic bags cloudy color or yellowish, feel sticky. Market circulation of blue, red, black plastic bags can not be used to package directly imported food, because most of these plastic bags are made of waste plastic. Smelly plastic bags also can not be used for food packaging. ② fire detection method: non-toxic plastic bags flammable, the flame is blue, yellow at the top, burning like candle tears dripping, paraffin flavor, smoke less; toxic plastic bags are not flammable, away from the fire that is extinguished, the flame is yellow, the bottom is green, softening can be drawn, with the irritating smell of hydrochloric acid. ③ water detection method: put the plastic bag in water and pressed into the water bottom, non-toxic plastic bags with a small specific gravity, can float to the surface, toxic plastic bags with a large ratio, sinking. ④ shaking detection method: grab the end of the plastic bag with your hand and shake, a crisp sound non-toxic; sound muffled toxic. 2, will “sweat” cling film home refrigerator, whether raw meat, or cooked leftovers, will be packaged with cling film. In addition, many people use the microwave oven to heat dishes, like to cover the bowl mouth of a layer of plastic wrap. If you happen to use PVC cling film, over the years, this small action will cause irreparable damage to you and your family’s health. Therefore, you need to be wary of unsafe cling film, which is made of polyvinyl chloride, often referred to as PVC material. PVC is a hard plastic. To make it transparent and soft, manufacturers have to add a lot of plasticizers to make it “compliant”. If the plasticizer stays in the wrap, it’s not a problem, but the key is that it slowly seeps out, chemically known as “sweating. These “sweats” are harmful to the human body, and those wrapped in PVC cling film on cooked food can harm people invisibly. PVC degrades and melts at 120°C, quietly releasing chlorine gas – something that is notoriously toxic. If you distinguish carefully, there will be a pungent smell in the microwave oven, that is the alarm of chlorine and other impurities “out of the cage”. If you buy cooked food in the supermarket, make sure that it is covered with PVC film, and then delicious, you are advised to resist buying. If it is raw vegetables and fruits, buy back carefully rinsed with water, the problem will not be too big. The most careful is to buy cut watermelon in the fruit stall, the half of the watermelon if covered with PVC film, be sure to cut off the outside layer, do not directly enter. Preventive measures: a look: the formal manufacturers of cling film, the outer box will indicate the material of cling film. If it is “linear low density polyethylene”, you can use it without worry. Even if this material is heated in the microwave oven until it melts, it will not release harmful substances. However, if it is made of “polyvinyl chloride” or “PVC”, it is better not to buy it. The second touch: safety materials made of cling film, elasticity is very good, stick in the food, bowl mouth tight and thin, if pulled hard, can be pulled a long time but also constantly. PVC cling film is not so comfortable. The PVC is not easy to burn, but it is a bad smell of plastic. Linear low-density polyethylene is easy to burn, smelling similar to candle flavor. 3, heat “poison” foam box instant noodles packaging in addition to plastic bags, foam boxes are also commonly used. Especially in the train this foam box instant noodles are good sales. But the material used in the foam bowl of this instant noodles is very loose, and there are a lot of bubbles inside. That is because the foam is mixed with blowing agent, some foam contains ammonia compounds, a hot water bubble will escape, very harmful to the human body. In addition, the material of some disposable plastic cups is also toxic when exposed to heat. U.S. Food and Drug Administration (FDA) some research shows that some food packaging utensils at room temperature is generally not dangerous, but at high temperatures, may release some chemicals, such as benzene, styrene, tetrahydrofuran (THF), these substances have long been proven to have adverse effects on human health, such as benzene long-term human intake will lead to anemia, white blood cells, platelets Decrease in serious cases will cause leukemia. In addition, some food packaging can also cause changes in food quality, such as polystyrene (the main component of some plastic products) is widely used in packaging fats, dried goods, etc., if the use of these appliances containing polystyrene when cooking, food will be left unpleasant “plastic” smell. These toxic substances are not visible only from the foam appearance, only when exposed to heat will be revealed, especially in the microwave oven is more poisonous. So buy instant noodles, as long as you come across this foam bowl, or not to buy as good. For disposable cups, use it to hold cold water no problem, but used to make tea is not desirable. Preventive measures: (1) the bottom of the safe plastic bowls are generally marked with the ingredients, polypropylene (PP) and polyethylene (PE) are safe. (2) In the process of heating food, try to remove the outside packaging film before heating, which will greatly improve the safety of the food. (3) those marked can be put into the microwave oven with the bottom box of frozen food, the bottom of the box should also have the composition mark, as long as it is PP or PE, you can use, even if you add a little too much heat deformation, there is no danger. If the packaging clearly requires you to remove the bottom box and plastic bag before heating, you should not be lazy and do as you are told. (4) When making instant noodles on the go, it is best to have your own lunchbox or porcelain bowl. It is also necessary to bring along a tea cup for your own use.