No matter what kind of plastic bag is used to hold hot rice; Although plastic food packaging bags are safe, we should also pay attention to the methods in use, otherwise it will bring negative effects. First of all, high-temperature food should not be put in plastic bags for a long time. In daily life, we often see people packing steaming fried cakes and fried dough sticks in plastic bags. If you eat it in a short time, it won't do much harm, but if the overheated food is put in a bag for a long time, some substances will seep out and affect your health. Secondly, use microwave oven to heat food, and it is best to use plastic bags and containers special for microwave oven. Finally, the frozen food in the refrigerator should be covered with plastic wrap instead of ordinary plastic bags. Due to the special technology and raw materials of plastic wrap, it has good air permeability and fresh-keeping performance, while ordinary plastic bags will quickly deteriorate and rot if used for a long time, and the purpose of fresh-keeping cannot be achieved. Pay attention to packing cooked food, snacks and other foods directly eaten in plastic bags: it is best not to use colored plastic bags. There are two reasons: first, the pigment used for plastic bag dyeing has strong permeability and volatility, and it is easy to ooze when it meets oil and heat; If it is an organic dye, it will also contain aromatic hydrocarbons, which will have a certain impact on health. Secondly, many colored plastic bags are made of recycled plastics. Because there are many impurities in recycled materials, manufacturers have to add pigments to cover them up. However, some plastic bags made of recycled plastics are also white. So we can't simply use color as the selection criterion. The most reassuring way is to see if the words "for food" are marked on the packaging bag. ?