However, this advertisement has aroused doubts from several senior three students and teachers in Xiangming Middle School. "We suspect that this advertisement may mislead consumers." After more than 40 experiments in two months, Fu, a member of the Creation Society of Xiangming Middle School, and four other students finally wrote the report "Questioning Master Hu's Science".
The TV advertisement raised questions.
"The products are made of high-tech alloy and purple sand materials", "Ensure non-stick and non-fume", "Save gas by more than 20% every year", "Save water and electricity, save gas by 1 1,000 yuan every year" ... Since June this year, a smokeless and non-stick healthy purple casserole named "Master Hu" has put a lot of shopping advertisements on TV media. According to the advertisement, this kind of pot has been studied by researchers for tens of thousands of times in five years, and its thermal conductivity is four times that of iron, saving a lot of energy. In shopping advertisements, there is even a comparative experimental picture of this pot and ordinary iron pot to confirm that this pot has no oil smoke and does not stick to food.
"I was furious when I saw this advertisement, and many of the statements in it were very problematic." Huang Zengxin, the instructor of the Creative Society of Xiangming Middle School, said that he noticed this advertisement in July. His experience in heat treatment research at 17 Machine Tool Factory told him that there were many problems in the advertisement.
"What new technology does this pot use to make it' smokeless and non-sticky'? The new material he promoted has a high thermal conductivity, which can really save 20% of gas and save 1000 yuan a year? " Once he chatted with a student Fu in the office, and this advertisement began to play on TV, so he raised his own problems, and Fu suggested to solve them through experiments.
Since mid-August, senior three students from Xiangming Middle School, including Fu, Ji Yi and Miao, have started their experiments together.
More than 40 experimental verifications
Yesterday, the reporter of Shanghai Oriental Morning Post called the Pot King Hotline and asked about the main ingredients of the pot. The service staff said that it is mainly manganese alloy and titanium alloy, as well as purple sand components. After the students sent the bought pot to an authoritative organization for testing, the results showed that the main component of the pot was aluminum, and it also contained trace amounts of manganese, iron, titanium and silicon.
"It is mainly an aluminum alloy pot. It has no advantage in energy saving, and it is impossible to save so much money. " Fu told reporters that in order to confirm the energy-saving performance of these pots, they put the same amount of water into eight pots, heated them under the same conditions, and calculated the time when the water reached the boiling point. Results King Pot ranked fourth among the eight pots, behind tin pot, thin iron pot pot and aluminum double bottom pot.
"According to the advertising materials, the thermal conductivity of the pot is four times that of iron, which makes people think that new materials are used." The students who participated in the experiment found that the thermal conductivity of aluminum is exactly four times that of iron.
The experimental report shows that the pot king pot is better than the ordinary thin pot in the oil smoke experiment, but it can't be "oil smoke-free" under fire. The consultant of Guo Wang hotline also admitted that the pot does have oil smoke under the fire, but as long as the ignition is turned down, there will be no problem.
"In fact, the bottom of the pot king is relatively thick, which can conduct the high temperature of local flames to the surrounding area, but the effect is not obvious under the fire." Huang Zengxin revealed that the anti-oil smoke effect of the 5mm bottom of the pot king is definitely better than that of the ordinary 2mm bottom, but this is the technology more than 20 years ago.
After more than 40 experiments, the students have come to the conclusion in their papers that Guo Wang's advertisements are not scientific and serious.
Three new inventions to solve the problem of oil fume
After the questioning, five students from Xiangming Middle School started their new "research".
According to the conclusion of the previous experiment, the students learned that the key to making the pot "smoke-free and non-sticky" is to let the pot radiate local heat to the surrounding area after being heated.
According to this principle, students independently put forward three ideas, namely "sandwich tin alloy oil-free non-stick pan", "smoke-free non-stick bottom flame arrester" and "smoke-free non-stick bottom functional gas stove", and are ready to apply for patents.
Questioning focus
◆ Choose natural purple sand?
King Hu: "Choose natural purple sand" (TV shopping advertisement), "The pot body is made of high-quality ceramic alloy and natural purple sand sintered at high temperature" (product description), "Mainly manganese titanium alloy" (consultation hotline).
Teachers and students: The report of the Material Quality Testing Center of Mechanical Industry shows that the main component of the pot is aluminum, in addition to 0.67% manganese, 0.58% iron and 0.0 13% titanium, which are too rare to reach the amount called alloy. Purple sand should contain iron oxide, but only metallic iron was detected in the test.
Expert: Gu Yingjun, an associate professor in the Department of Physics, School of Science, East China University of Science and Technology, said that it is not enough to measure the atomic content just by looking at the composition of the pot. He offered two plans for students. First, you can put the pot in an acidic solution. If the pan is made of aluminum, it will dissolve quickly. If the pot is made of alumina, that is, ceramics and purple sand, then the acidic solution has almost no effect on the pot.
Another method is to measure the conductivity of the pot. Aluminum pot with aluminum as the main metal has good conductivity, but ceramics or purple casseroles made of alumina are insulators and have no conductivity at all.
◆ China's first smokeless non-stick pan?
Guo Wang: "The natural purple sand selected for the product, after high-temperature sintering, forms a microporous structure on the surface of the pot body, so as to achieve non-stick material and uniform heating, and the pot body has no local high temperature (description)", "absolutely no oil smoke, absolutely non-stick", "the first truly oil smoke-free, truly non-stick pot in China" (shopping advertisement), "absolutely no oil smoke on a small fire, and non-stick on a small fire" (consultation telephone number).
Teachers and students: It is true that there is no smoke or stickiness on a small fire, but it is impossible to cook with a small fire forever. The bottom of the pot king pot is thicker than the general pot, reaching 5mm, which can really make the high temperature evenly distributed, but this is the common feature of non-stick pots, and it is not an exclusive patent. The two utility model patents provided by the utility model are both about the thread on the outer surface of the pot. Although it does have the effect of making the bottom surface heated more evenly, similar technology has long been widely used by most non-stick pans, not to mention "the first in China".
Expert: It is difficult to analyze the specific situation, but the analysis of teachers and students in Xiangming Middle School is basically correct.
◆ Save electricity, water and gas?
Guo Wang: "The thermal efficiency is high, and the thermal conductivity reaches 175, which is four times that of iron. Long heat storage time, fuel and gas saving "(instruction)," Absolutely save electricity, water and gas, saving 1000 yuan per year "(advertisement). Teachers and students: the experiment shows that the heat conduction effect of pot king is similar to that of ordinary aluminum double-bottom pot. The thermal conductivity of aluminum is about four times that of iron. Even if the explanation is true, adding purple sand to aluminum pot will only reduce the thermal conductivity and will not achieve any energy-saving effect. Saving 1 1,000 yuan a year is even more exaggerated. The average family's annual gas cost is only about 654.38+10,000 yuan. As a pot, it is impossible to save electricity and water.
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