What kind of cups do students drink? Cups are things that we touch our lips directly every day, so we should choose cups carefully, especially student cups. There are quite a few beautiful and practical cups. Let's see what kind of cups students drink.
What kind of cups do students drink? 1 glass: some contain lead, which is easy to lead poisoning.
Because glass contains no organic chemicals, drinking water from glass is more hygienic and safer. When choosing glass, you must choose transparent and ordinary glass. It should be noted that the glass is afraid of thermal expansion and cold contraction, and the glass with too low temperature should not be filled with hot water immediately to prevent it from bursting. However, if colored glass is painted with pigment, it may dissolve carcinogenic chemicals after boiling water. Many crystal glasses contain lead, and improper use may lead to lead poisoning.
Ceramic cups: Be careful not to buy glazed ones.
If you can't resist the temptation of color, reach out and touch the color surface. If the surface is smooth, it means underglaze color or underglaze color, which is relatively safe. If it is uneven, it will fall off with nails, which means it is glazed. Don't buy it.
Stainless steel thermos cup: buy edible stainless steel above grade 304.
The thermos bottles on the market are divided into glass vacuum insulation containers and stainless steel vacuum insulation containers in terms of materials. The former includes common thermos bottles, insulated lunch boxes, glass liner thermos cups, etc. And the latter is mainly stainless steel thermos cups. Buy stainless steel thermos. Remember to buy edible stainless steel above grade 304, and don't always make tea in stainless steel thermos.
Plastic cup: Choose a cup made of food-grade plastic that meets the standard.
Plasticizers are often added to plastics because they contain some toxic chemicals. When hot water or boiled water is filled in plastic cups, toxic chemicals are easily diluted into water, and there are many cracks in the internal microstructure of plastic, which hides dirt. Therefore, experts remind that when purchasing plastic cups, you must choose cups made of food-grade plastics that meet the standards.
Magnetizing cup: a magnetized cup made of unipolar magnetic sheet (negative electrode).
Only the magnetized water of the negative electrode can improve the physiological function of the human body and play a health care role, while the magnetized water of the positive electrode should not be drunk more. Most of the magnetized cups we see in the market are made of ordinary magnets, regardless of positive and negative poles. Therefore, consumers should carefully identify when choosing a magnetized cup, and choose a magnetized cup made of unipolar magnetic sheet (negative electrode).
Paper cups: The water temperature is too high, and the material is easy to cause cancer.
There are three kinds of paper cups on the market: one is made of white cardboard and can't hold water and oil. The second is a waxed paper cup. As long as the water temperature exceeds 40 degrees Celsius, the wax will melt and release carcinogenic polycyclic aromatic hydrocarbons. The third kind is a paper-plastic cup. If the selected materials are not good or the processing technology is not enough, polyethylene will crack and change during hot melting or smearing on paper cups, resulting in carcinogens.
Enamel cup: high temperature manufacturing, material safety.
Because the enamel cup is glazed at a high temperature of thousands of degrees Celsius, it does not contain harmful substances such as lead, so it can be used with confidence. However, damaged enamel cups are easy to precipitate harmful substances when holding drinks, so they should be eliminated decisively.
Scientific research shows that drinking eight glasses of water a day can keep your body hydrated. Pay attention not only to the amount of water, but also to the choice of cups. These are cups for students and cups for students to drink water. I hope it will help everyone.
What kind of cup is good for students to drink water? 2 Choose materials according to the purpose. A portable plastic cup is usually enough.
The material of the cup is universal, and the material is your choice. At the same time, it depends on what kind of cup to use, and it can also be based on your own hobbies.
If you are making coffee, cereal or soybean milk in the dormitory, you can use ceramic cups. Ceramic cups are easy to clean and easy to use with spoons. If you want a ceramic cup, you need to buy a good quality cup, otherwise it will affect the taste of the drink.
If you commute between dormitories, canteens and classrooms, you can prepare a thermos cup, the size of which can be determined according to your own needs. Pay attention to the material, at least 304 material or 3 16 material. The material of 3 16 is better than that of 304, and the price may be higher. Generally speaking, 304 is enough material.
If you drink plenty of water, you can choose a larger cup, such as 500-550ml, or 300-400ml if it is small. And because it is to be carried out, it is best to have a carrying belt.
Water cups are the most commonly used on weekdays, but there are many kinds of cups. As far as cup materials are concerned, there are common cups, enamel cups, ceramic cups, plastic cups, stainless steel cups, paper cups, thermos cups, health cups and so on. How to choose a safe drinking cup;
1, plastic cup: choose food-grade plastic.
Plastic cups are loved by many people because of their changeable shapes, bright colors and fear of being beaten, which is very suitable for outdoor users and office workers. Generally speaking, there are signs on the bottom of plastic cups, which are the numbers on the small triangle. The common one is "05", which means that the material of the cup is PP (polypropylene).
The cup made of PP has good heat resistance, the melting point is 170℃~ 172℃, and its chemical properties are relatively stable. It is relatively stable to other chemical reagents except for corrosion by concentrated sulfuric acid and concentrated nitric acid.
But the problem of ordinary plastic cups is very common. Plastics belong to polymer chemical materials. When hot water or boiled water is filled in plastic cups, polymers can easily precipitate and dissolve in water, which is harmful to human health after drinking.
Moreover, there are many pores in the internal microstructure of plastic, which contain dirt, and improper cleaning will breed bacteria. Therefore, the choice of plastic cups is very important for the choice of plastic materials, and food-grade plastics that meet national standards must be selected. That is PP material.
2, ceramic cups: choose underglaze color as well.
Colorful ceramic cups are very pleasing, but in fact, there are huge hidden dangers in those bright pigments.
The inner walls of low-priced colored ceramic cups are generally coated with a layer of glaze. When the glazed cup is filled with boiled water or drinks with high acidity and alkalinity, some heavy metal toxic elements such as aluminum in the glazed cup can easily precipitate and dissolve into the liquid. At this time, if people drink liquid containing chemicals, they will be hurt.
When using ceramic cups, it is best to use natural color cups. If you can't resist the temptation of color, reach out and touch the color surface. If the surface is smooth, it means underglaze color or underglaze color, which is relatively safe. If it is uneven, it will fall off with nails, which means it is glazed. It is best not to buy it.
3, paper cups: disposable paper cups should be used less.
Now almost every family and unit will prepare disposable sanitary paper cups, which are hygienic and convenient for one person to use and throw away after use, but such an ordinary cup hides many problems.
There are three kinds of paper cups on the market:
The first one is made of white cardboard and can't hold water and oil.
The second is a waxed paper cup. As long as the water temperature exceeds 40℃, the wax will melt and release carcinogenic polycyclic aromatic hydrocarbons.
The third kind is a paper-plastic cup. If the selected materials are not good or the processing technology is not enough, polyethylene will crack and change during hot melting or smearing on paper cups, resulting in carcinogens. In order to increase the toughness and rigidity of the cup, a plasticizer will be added to the paper cup. If the dosage is too large or illegal plasticizer is used, the sanitary conditions will be difficult to guarantee.
4. Glass: practical, safe and crack-proof.
The first choice for drinking cups should be glasses, especially for office and home users. Glass is not only transparent and beautiful, but also the healthiest and safest cup made of all materials.
This kind of glass is made of inorganic silicate, and there are no organic chemicals in the firing process. When people drink water or other drinks from cups, they don't have to worry about chemicals being drunk into their stomachs. Moreover, the glass surface is smooth and easy to clean, and bacteria and dirt are not easy to breed on the glass wall, so it is the healthiest and safest for people to drink water from the glass.
However, it should be noted that the glass is most afraid of thermal expansion and cold contraction, and the glass with too low temperature should not be filled with hot water immediately to prevent it from bursting.
5, stainless steel cup: do not install acidic drinks.
The advantages of stainless steel cups are durability, rust prevention and corrosion prevention. However, stainless steel cups are alloy products, which contain many heavy metals, such as nickel, chromium and manganese. If used improperly, these heavy metals will be released easily, which is harmful to health.
Therefore, in daily use, be careful not to use stainless steel cups to hold acidic drinks, such as juice, coffee, carbonated drinks, etc. Do not store soy sauce, vinegar, vegetable soup, tea, etc. For a long time, the electrolyte in these foods may react with the heavy metals in stainless steel, leading to the precipitation of heavy metals.
When cleaning stainless steel cups, do not use strong alkali or oxidizing chemicals, such as soda and bleaching powder. These substances also easily react with stainless steel.
6. Enamel cups: After being damaged, they should be eliminated decisively.
Enamel cups are also a good choice. Enamel is a kind of composite material in which inorganic glass material is melted and solidified on metal by thousands of degrees. The enamel coating on the metal surface can prevent rust, so that when the metal is heated, it will not form an oxide layer on the surface, and it can resist the corrosion of various liquids.
Enamel products do not contain harmful substances such as lead and are easy to carry and clean. They are widely used as tableware and washing utensils in daily life. Enamel cups have one disadvantage. Enamel cups are afraid of bumping and the surface is easy to be damaged. The research shows that damaged enamel cups are easy to precipitate harmful substances when holding drinks, so they should be eliminated decisively.