What kind of material is good for tableware? 1. Silver tableware:
Silver tableware, silver ionizes a very small amount of silver ions in water, which has bactericidal effect. In many ancient chess pieces, people also used silver needles to test whether food was poisonous. However, silver tableware is a luxury after all, and copper bowls have similar effects. It is best not to use aluminum bowls. If you use it too much, you will be careful of mental decline.
2, wooden tableware:
First of all, wooden tableware is a pure natural product, rich in resources and renewable. There is also wood, 100% degradable. Because of the non-degradability of plastic tableware and the luxury of silver tableware, wooden tableware is a safe and affordable choice. Wooden tableware can also be made into hardwood of any shape, such as birch and maple.
However, wood is a porous material with strong water absorption, which has been soaked by water and bacteria. Because of this, wooden tableware is unsanitary and not suitable for long-term use. Wooden tableware is made of certain types of wood, such as cedar or cypress, which may have a strong smell and oily resin in Ran Hui video. Wooden tableware is a by-product of wooden structure construction, and imported wood or recycled wood may come into contact with chemicals during washing or manufacturing. In addition, wooden tableware is polished and smooth, and it is safe to use. Wood is dry, but it may produce chips or cracks. If it is not properly preserved, it is a security risk, and the danger of division is really rare. But compared with wooden tableware, silver and plastic products are much safer.
Here we talk about the harm of disposable chopsticks, because in many fast food restaurants, even restaurants, disposable chopsticks are the most common, which is very harmful to us:
(1) Damage to respiratory function: Disposable chopsticks, after being fumigated by sulfur in the production process, will release SO2 when heated during use, which will corrode respiratory mucosa;
② Damage to digestive tract function: Disposable chopsticks are bleached with hydrogen peroxide in the production process, which is corrosive and harmful to the oral cavity. Corrosion of esophagus, forefinger and gastrointestinal tract; If talcum powder is used in the grinding process, if it is not cleaned, it will slowly accumulate in the human body, causing gallstones;
③ Bacterial infection: The shelf life of sterilized disposable chopsticks is as long as 4 months. Once the shelf life has passed, it is likely to bring staphylococcus aureus, Escherichia coli and hepatitis.
(4) Disposable chopsticks are likely to have a "greenhouse effect". Because of the vicious circle, there are fewer trees, more CO2, thicker atmosphere, and it is difficult to isolate heat, so there is a "greenhouse effect".
3, bamboo tableware:
Bamboo chopsticks are the most commonly used, economical and practical, and do not waste wood, but they should be kept dry, otherwise they are easy to get moldy, especially in the south. In rainy and humid seasons, pay attention to washing and put it in a ventilated place.
4, glass tableware:
Clean and hygienic, generally does not contain toxic substances. But glass tableware is fragile and sometimes "moldy". This is because the glass has been eroded by water for a long time, and the sodium silicate in the glass reacts with carbon dioxide in the air to generate white carbonic acid crystals, which is harmful to the health of the heat body and should be cleaned frequently with alkaline detergent.
5, iron tableware:
Generally speaking, iron tableware is non-toxic. However, it should be noted that iron is easy to rust, and rust can cause nausea, vomiting, diarrhea, upset, loss of appetite and other diseases; In addition, it is not advisable to use iron containers for cooking oil, because oil is easy to oxidize and deteriorate when stored in iron for too long.
6, stainless steel tableware:
Beautiful and generous, light and durable, wear-resistant and rust-free, deeply favored by people. Stainless steel is made of Fe-Cr alloy mixed with metals such as nickel, molybdenum, titanium and manganese. Some of these metals are harmful to human body, so be careful not to put salt, soy sauce, vinegar, etc. It takes a long time, because the electrolyte in these foods will react with stainless steel for a long time, so that harmful substances will be dissolved out. Don't cook Chinese medicine with stainless steel tableware, because Chinese medicine contains many alkaloids, organic acids and other ingredients. When heated, it will react with the components in stainless steel, making the medicine ineffective, and some even produce toxic compounds.
7, enamel tableware:
Acid and alkali corrosion resistance, good chemical stability. However, enamel tableware is an iron product made of enamel and contains compounds such as lead silicate, which is harmful to human body.
8, plastic tableware:
Its advantages are light, beautiful, unbreakable and cheap, and it is deeply loved by people. Plastic tableware is mostly made of polymer materials such as PVC and additives. If the monomer vinyl chloride is not removed cleanly or the additives are not used properly, it will also endanger human health. Excess plastic tableware is made of polyethylene, polypropylene and melamine. Melamine plastic is a kind of thermosetting plastic, which is made of melamine formaldehyde resin as the main raw material and some pulp fiber fillers, colorants and other accessories. Non-toxic and tasteless, acid-resistant and alkali-resistant, it is now used to make children's tableware in the market.
9, ceramic tableware:
China is a great invention, which is used the most. The production methods of ceramic tableware are divided into three types: over-glaze color, under-glaze color and in-glaze color. What's the difference between these three? Why is the surface of porcelain smooth and bright? This is because its surface is covered with enamel. As the name implies, the overglaze color is that the painted pattern is attached to the surface of the glaze, the underglaze color is that the painted pattern is integrated into the middle of the glaze, and the underglaze color is that the painted pattern is painted on the ceramic embryo under the glaze. We see the same pattern painted on the surface of tableware, some are smooth and plain, some have a sense of prominence, and there is also an obvious sense of concavity and convexity when touched by hand. The basic judgment of obvious unevenness is glaze color. Overglaze color is to draw a pattern on the burned porcelain blank and then heat it at high temperature to fix it. If the technology is not sophisticated, the glazed tableware will wear or peel off after a period of use. In addition, some overglaze pigments contain harmful metals such as lead and cadmium. These harmful elements are easy to dissolve when cooking acidic food, which is harmful to the body. Therefore, when purchasing household porcelain, it is best to buy household porcelain with advanced technology and environmentally friendly pigments.
Matters needing attention in the selection and use of tableware
1, when buying ceramic tableware, it is best to choose tableware with white inner wall and no glaze pigment.
Newly bought ceramic tableware can be soaked and boiled in 4% vinegar water first, which can remove harmful substances. When purchasing ceramic tableware, you should choose products with fine processing, dense appearance, uniform luster, smooth surface and uniform and solid glaze layer. It is best to choose products with advanced technology and environmentally friendly pigments.
2. Don't choose colorful plastic tableware.
According to testing, some plastics have excessive release of heavy metal elements such as lead and cadmium in color patterns. So try to choose colorless, odorless and decorative plastic tableware. In addition, when buying instant noodles, you should pay attention to the logo on the bottom of the bowl. If it is marked with "PS" (polystyrene) or "PP" (polypropylene), you can use it with confidence. However, foamed plastics contain foaming agents. After soaking in hot water, the harmful substances in the foaming agent will dissolve out and enter the human body with food. Disposable foam plastic boxes are non-degradable and have the above problems, so it is forbidden to use them.
3. Don't choose to draw chopsticks.
Although painted chopsticks are very decorative, they are not desirable from a health point of view. Because paint contains many toxic substances such as lead and cadmium. People had better choose unpainted bamboo or wooden chopsticks that meet the hygiene standards.
4, non-stick pot, rice cooker, etc. It should not be dry-burned.
The plastic coating on the inner wall of non-stick pan and rice cooker is PVC. When heated above 400℃, this coating may release the toxic gas tetrafluoroethylene. Therefore, people must not let non-stick pots and rice cookers burn out.
5. Iron and aluminum tableware should not be used together.
Although iron tableware is safe, if it is used with aluminum tableware, it will bring more harm to human body. Because aluminum and iron are two metals with different chemical activities, when water exists, aluminum and iron can form chemical batteries, and as a result, more aluminum ions can enter food. Therefore, aluminum spoons, aluminum shovels, iron pots and other tableware should not be used together.
There are many kinds of tableware, each with its own advantages and disadvantages. It is generally believed that aluminum pot should be used as little as possible, stainless steel pot should be used for cooking, iron pots and copper pots should be used for cooking, and casserole should be used for soup and stew.