Should I drink the first glass of water in a disposable paper cup?

gossip:
disposable paper cup on the inner wall is usually coated with a thin layer of wax, if the temperature of the water exceeds 40 degrees C, wax will melt, so disposable paper cup is best used for cold drinks. In addition, when using disposable paper cup, the first cup of water is best not to drink, it is best to wait four or five minutes after the water poured out, so that the paper cup of harmful substances fully volatile.Truth:
This is a "small suggestion" on a disposable paper cup that has been circulating on Weibo recently, and this advice mainly has the following main points: 1) paper cup walls are usually waxy.2) These waxes will melt at more than 40 degrees C.3) according to 1), 2) the introduction of paper cups can not be filled with hot drinks.4) Paper cup contains harmful substances.5) Soak the paper cup with water for four or five minutes to fully remove harmful substances.6) According to 4), 5) the first glass of water in a paper cup can not be drunk.these points are not entirely nonsense, they involve some facts, but more false understanding. To analyze the right and wrong of this recommendation, you first need to have a basic understanding of disposable paper cups.all the paper cups have wax? In terms of the type of paper cup "The inner wall of a disposable paper cup is usually coated with a thin layer of wax", which is only a third right.the current domestic paper cup according to the use can be divided into three types: cold drink cup, hot drink cup and ice cream cup. According to the coating of the paper cup can also be divided into three types: wax cup, polyethylene coating cup and straight-wall double-layer cup.Waffin cup is similar to the kind of paper cup described in the gossip, the surface is coated with a layer of wax used to separate water, polyethylene coating cup is covered with a thin layer of polyethylene on the cup wall, straight-walled double-layer cup wall has two layers of paper, between the paper is air, good insulation performance.wax cup can only be used as a cold drink cup because it melts when it is hot. If you want to fill a hot drink need to add another layer of lotion, straight-wall double-layer cup is used with this coating, and because the double-layer cup insulation is good, so often used to make hot drink cup and ice cream cup. Polyethylene coated cup is a new process, the advantage is that both cold and hot drinks can cope with the ease, and the surface is smoother, the outside of the cup can be convenient to print beautiful patterns, so much favored by the fast food industry.can say that the current polyethylene coating cup is already the mainstream paper cup products. However, the industry standard for paper cups still includes waxed paper cups, and the research work of such paper cups is still being done, so consumers still have access to waxed paper cups.cup with wax more than
40
degrees C
melt? That is certainly not qualified products according to the paper cup industry standard "QB 2294-2006 paper cup" on the performance of the paper cup requirements, waxed paper cup is used in food-grade paraffin. And the national standard "GB 7189-2010 food grade paraffin" this type of paraffin according to the melting point classification, there are 52, 54 to 66 and other 8 kinds, 52 paraffin requirements melting point is not less than 52 degrees C, not higher than 54 degrees C, 54 paraffin melting point is not less than 54 degrees C, not higher than 56 degrees C, so analogy.means that if you're drinking hot drinks, the wax-coated layer does melt, but for a qualified wax-coated paper cup, the temperature is at least 50 degrees Celsius.would happen to a hot drink with a waxed paper cup? Because waxed paper cups rely on wax layer to separate water, if the wax layer melts, water will penetrate into the body of the cup, so that the paper cup soft, or even leakage.and qualified paper cups are made with food-grade paraffin, even if accidentally drunk into the stomach, do not have to worry, that bit of paraffin will not cause harm to the body. The real danger of filling hot water with a cold drinking cup is that when paraffin melts, the paper cup loses its water resistance and can easily be penetrated by hot water, scalding the user.Infolent substances in paper cupspaper cups in the production process may be mixed with a lot of harmful substances, such as illegal manufacturers use fluorescent agents, paper cups outside the wall spray patterned pigments and additives into lead, arsenic and organic solvents, in the storage process may also be contaminated by microorganisms.For harmful substances in paper cups, the industry standard states as:If it is a qualified paper cup that meets the standards, it contains very few harmful substances, not enough to cause harm to the human body. It is also impossible to require paper cups without these substances, such as lead and arsenic, in nature itself, the production process can only reduce its content, completely remove although technically feasible, but the cost will be high, no practical significance. It is more appropriate to limit their content to a safe range.to remove harmful substances,
enough
5 minutes?more detailed description than "don't drink the first glass of water" is that "by burning with boiling water for four or five minutes before using a disposable paper cup, the harmful substances in it can be completely removed." "It's a very wide-ranging statement, and some regular newspapers are recommending this "tip."use boiling water, just five minutes is enough to get rid of the harmful substances in the cup?if there are really pathogenic bacteria in the cup, then 5 minutes of blisters at 100 degrees C can basically kill the reproduction of the general bacteria. But here's however, keeping 100 degrees C heated for 5 minutes, which is not possible in daily use.for lead, arsenic and fluorescent substances, five minutes of hot water is also of little use. For this question, we can think the other way around, if only 5 minutes of water soaked at 100 degrees C can remove the remaining bit of harmful substances are clean, industrial production has long used this method to produce safer paper cups, but also with consumers to do it themselves?As for non-conforming paper cups, the number of pathogenic bacteria and other harmful substances can not be estimated, even if the method of boiling blisters for 5 minutes has a certain effect, there is no guarantee that these harmful substances can be completely removed, or reduced to safety standards. Choosing a qualified paper cup is the best policy. For a qualified paper cup, it is not necessary to pour out the first glass of water., however, the reality is always varied, and what is said above is more about buying a new paper cup. Even qualified paper cups, if opened and put for a long time is useless, it is likely that microorganisms have exceeded the standard, the safest way to do this is to treat these paper cups as unqualified - throw away to buy a new one.how to choose a safe paper cup In fact, paper cup and buy food is the same, you need to see clearly whether there is a clear QS logo on the packaging of paper cups, manufacturer information, production date. Don't be greedy for cheap and buy unlisted cups. Also want to see clearly the scope of application indicated on the packaging, the formal disposable paper cup will indicate the applicable temperature of this paper cup, if you buy a cold drink cup must not be used to fill hot water, so as not to leak burns.eating out, some of the big fast-food chains can still use paper cups with confidence. In restaurants with harsh environments and no sanitary permits, the paper cups used are difficult to secure. What's more, eating in such a place, food safety is not guaranteed, even if the "five-minute disinfection method" is really effective is also a white tie, or do not eat in such a place as well.Conclusion:
most common polyethylene coating cup on the market does not have melting wax, hot and cold drinks are not a problem. Waxed paper cup is a cold drink cup, it does cause the wax layer to melt due to the filling of hot water, but the result is that the paper cup will seep water. Burning with boiling water for four or five minutes can not remove any harmful substances, if it is a qualified paper cup, the first glass of water but drink no harm, if it is a non-conforming paper cup, the first few glasses of water do not drink.