the imitation porcelain tableware has been exposed to toxic exposure, Qingdao market is not? In May 16th, the reporter visited the Fushun road wholesale market and small and medium-sized supermarkets found, inferior imitation porcelain The tableware is still on sale. These poor imitation porcelain tableware cost half of the price, the above lack of QS logo, and even no manufacturer.
[b] imitation porcelain tableware for the [/b]
when the most toxin? The more colourful and more toxic? How do you buy the tableware to release the toxin? With these questions, the reporter interviewed Professor Feng Shaohua of the College of polymer science and engineering of Qingdao University of Science & Technology. Under the guidance of experts, reporters used experiments to test these questions.
[b] visit [/b]
[b] without QS logo porcelain tableware still in the sale of [/b]
QS logo is the enterprise approved to produce porcelain imitation tableware, it is also one of the basic signs to identify the product. Several small supermarkets and supermarkets that visited the reporters found that the imitation porcelain tableware without QS logo is still hot. There is a wholesale market of kitchen utensils in the wholesale market of Fushun road. Just entering the door, you can see a long list of imitation porcelain tableware placed on the shelf. According to the owner of the shop, "these tableware are also called melamine material tableware, which mainly supply large restaurants and restaurants in the city."
although they are all imitation porcelain tableware, there is a gap between appearance and price. The boss pointed to the imitation porcelain tableware of black, red and thick bottom, told the reporter, "if you open a large shop, compare the grade, this bowl and plate are more suitable. But the price is also relatively high, only more than 10 yuan per bowl. " Careful observation, this set of imitation porcelain tableware is red inside, black, bright color, and has a heavy feeling. In addition to the matching bowls and plates, there are cups and saucers, but the materials are the same.
contrasts with this kind of red and black tableware is the cheap imitation porcelain tableware stacked on the other side. In appearance, these porcelain tableware are brighter, but they are much thinner. The bottom of these bowls, except for the Pinyin produced in China, does not have any manufacturer or QS logo.
[b] are called porcelain imitation tableware, the price is nearly double [/b]
are porcelain imitation tableware, and the gap is not big, but the price can be asked, but it is bad. The reporter in Fushun road wholesale market, through the price, spend 3 yuan to buy a round bowl for children, but the same style, the appearance of a big gap in the bowl, in a large supermarket in the people's road, but sold 7 yuan, the price is even more than doubles.
in a large supermarket in the people's road, the reporter found that the number of porcelain imitation tableware on the shelf is not much, but the price is generally high, just taking out a bowl is not less than 6 yuan. And carefully check the bottom of the bowl, most of which are marked with QS logo and manufacturers. Among them, what kind of imitation porcelain tableware can be used to hold food, which can only be used for holding items, and the logo on the bottom of the bowl is clearly stated. The comparison of the bowl bought by the reporters found that the bowl bought from the big supermarket approached the feeling of ceramics, while the bowl bought in the shop was partial to plastic.
how bad is the price? The reporter consulted professor Feng Shaohua of the College of polymer science and engineering of Qingdao University of Science & Technology. He said: "porcelain imitation tableware is usually made of two kinds of materials: one is urea formaldehyde resin, the other is melamine resin." It sounds like a different name, but something similar is made. But from the price point of view, urea formaldehyde resin is about 5000 yuan per ton, while melamine resin is about ten thousand yuan per ton, and the price is more than doubled.
[b] experiment [/b]
[b] intuitive: sound, light, feel hard [/b]
professor Feng Shaohua of the College of polymer science and engineering of Qingdao University of Science & Technology is an expert on plastic research. He told reporters: "only from the sense of the senses, can also distinguish inferior imitation porcelain tableware." The reporter placed the bowl on the desk of Professor Feng. Professor Feng picked up the green green bowl bought by 3 dollars and carefully examined it. The analysis said that the main three aspects of the method were: sound, light, color and hardness.
[color=#FF0000] listen to voice: poor bowl knocks with crisp sound, and some sound close to plastic. Actually, the imitation porcelain tableware made of good materials is actually close to porcelain and feels a bit stuffy.
look at the light: the journalist will compare the porcelain imitation tableware bought from the big supermarket and the porcelain imitation tableware bought on the small stall. Under the strong light, the inferior imitation porcelain tableware is bright and the outer wall is thin. And the bowl bought from the big supermarket is in the sunlight, the color is black, the material density is high, also obviously must be heavier.
hardness: the urea formaldehyde resin material is crisp and hard to break. And the imitation porcelain tableware made from melamine resin will not change due to partial ceramic.
"there is a saying that the deeper the color of the imitation porcelain tableware is, the stronger the toxin is, the deeper color is used to cover up the deficiency. Is it reasonable?" the reporter consulted Professor Feng.
"inferior imitation porcelain tableware" is brightly colored, mainly mixed with organic colors, which can be matched at will. But these organic colors have relatively low temperature resistance, and these colors fade easily at higher heating temperatures. But these colors are "annoying", because some of them are harmful to the body, but some of them are not. Professor Feng explained. "Imitation porcelain tableware although close to ceramics, but the production process is different. The color of ceramics is mostly heavy metal. If the color is more vivid, the higher the content of heavy metal is, the more toxic it is. And the color of this kind of imitation porcelain tableware is brightly colored. Therefore, we can not simply judge the degree of colourful color. [/color]
[b] cooking bowl: heat 30 minutes, poor quality imitation porcelain tableware foam [/b]
[color=#FF0000] von von recommended a common discrimination: put in hot water. "Urea formaldehyde resin and melamine resin have different temperature resistance grades. Under normal circumstances, urea also has a certain ability to withstand temperature, but the ability to withstand temperature is much worse. Although some are marked at 120 centigrade temperature resistance, there is no problem in a short period of heating, but the heat is easy to dissociate under high temperature for a long time. Sometimes the uric acid, which is not diluted, comes out. Melamine resin is relatively good, which is difficult to analyze. At present, the state has issued a clear regulation of the free amount of formaldehyde and melamine resin. By soaking and heating, the free amount will be analyzed to a certain extent and then by chemical analysis of the amount dissolved in the water. "
the reporter put the pot on the gas stove and heated it to boil, then put the two kinds of imitation porcelain tableware in the pot and heat it. The time lasts for 30 minutes. During this process, the reporters kept checking, and the inferior porcelain tableware made a strong smell, and the label stuck on the bottom of the bowl dropped. After 30 minutes, the reporter will take out the tableware containing the urea formaldehyde resin, and have a strong pungent smell, and look at the bottom of the tableware carefully. The tableware containing melamine resin material did not change much, and it cooled quickly after taking off. [/color][b] suggested that [/b]
[b] citizens to buy home, it is better to use water to cook [/b]
no matter what materials of porcelain imitation tableware, buy home if you want to deal with it first?
Professor Feng, "buy home, it is better to put in the pot first boiled. Porcelain imitation tableware is very similar to the decoration materials we use. After all, it contains melamine or formaldehyde, which will be released when the temperature reaches a certain extent. If cooked, it can speed up the "free formaldehyde and melamine". These substances are easily dissolved in water and cause harm to the human body.
the service life of the "imitation porcelain tableware" is determined according to the frequency and usage. If there is no contact with high temperature and acid-base, it is no problem to eat porridge and other substances at normal low temperature. However, once there are problems with porcelain like tableware, it is necessary to replace them in time. Professor Feng finally reminded the public: "it is best to buy the tableware that is marked in the regular supermarket. The bottom of the bowl should have at least the QS certification of the manufacturer, the use of materials and the hygienic standards."
Author: Li Min