There are coatings on the inner wall of the paper cup. Consumers are worried about hidden dangers. Disposable paper cups are familiar to everyone, small in size, easy to carry, and easy to use when used by one person and used up. But recently, a microblog that was reprinted on the Internet has written that the inner wall of the disposable paper cup is coated with a layer of wax. "Wax" we also know that it will melt when it encounters high temperature, does it mean that the disposable paper cup can not be loaded with heat? What about water? Drinking hot water in a disposable paper cup will have an impact on people's health? Let’s look at the investigation of CCTV’s “First Time†reporter. Recently, a microblog on the Internet wrote that the inner wall of a disposable paper cup is coated with a layer of wax. When the water exceeds 40 degrees Celsius, the wax on the inner wall of the cup melts into the water and is eaten into the body. Immediately, "whether a disposable paper cup can hold hot water" has caused people's heated discussion. The reporter walked into several department stores as consumers. The question of whether the paper cups sold in the store can hold hot water is very consistent. The answer is very consistent: if you can't use hot water, you can definitely install hot water. As for the online saying, there is a layer of wax on the inner wall of the paper cup that “melts when it is hotâ€, and the salesperson gives a negative answer. The reporter then randomly purchased four paper cups of different prices and sizes in these stores and brought them to the chemical laboratory of Hefei University of Technology. Bailey, a graduate student in the Department of Chemical Technology at Hefei University of Technology, said that the first experiment he had to do was to look at the paper cups that the reporter bought, and whether there was a "waxed inner wall" on the Internet. The results of the experiment show that it is relatively rare to use wax as the inner wall coating in disposable paper cups sold on the market. But then he did a second experiment, adding 100 degrees Celsius hot water to the cups of four different materials to see if the cups were soft. After five minutes, the shape of these cups changed. This means that the material inside the cup wall may have undergone a chemical reaction. If the coating is hot, it will soften the disposable paper cup. As a result of the experiment, we also saw that the material inside the cup may react with hot water, and a chemical reaction may occur. What is this material? For the inner wall materials of these disposable paper cups used in the experiment, professionals say that this is the "polyethylene" that is common in our lives, and even if the paper cup coating is not the wax transmitted on the net, such paper cups are not suitable for holding hot water. of. Liu Kun, Ph.D., of the School of Chemical Engineering, Hefei University of Technology, said that the melting point of polyethylene materials is probably between 110 and 120 degrees. That is to say, when we use relatively high temperature water, it may lead to polyethylene. Plastic oxidation. Therefore, if you use a paper cup with a polyethylene inner wall to drink hot water, there will be certain safety hazards. However, on the outer packaging of the paper cups purchased by the reporter, most of them are written to withstand high temperatures of 100 degrees or more, and even others are marked as "microwave 130 degrees." In this regard, Liu Kun, Ph.D., of the School of Chemical Engineering, Hefei University of Technology, said that these materials will soften after the temperature rises, close to the melting point of polyethylene or polypropylene. After softening, it may enter the human body through beverages. Of course, this is trace amount. Only when you drink it for a long time can it cause safety hazards and hidden dangers to the human body. Professionals remind that paper cups made of "polypropylene" material are safer than paper cups on the inner wall of polyethylene. Consumers should pay attention to the materials selected for the cups when purchasing paper cups, and whether there is detailed production on the outer packaging. Manufacturer, shelf life, inspection mark, and it is best not to use paper cups to hold hot water. Spandex Covered Polyester Yarn Spandex Covered Polyester Yarn,Polyester Yarn For Socks,Covered Polyester Yarn For Socks,Spandex Single Covered Polyester Yarn Shaoxing Shiffon Textile Co., Ltd , https://www.shiffontex.com