What material is good for the thermos cup?
1, stainless steel
Stainless steel thermos cup is not easy to produce corrosion, pitting and corrosion, and is wear-resistant and durable; Nowadays, it has become a new trend of using cups in modern families. The stainless steel thermos cup is gorgeous, bright, fashionable and durable, which adds design color to our plain life. And has the characteristics of firmness, tight combination and being difficult to be destroyed; Stainless steel thermos cups are generally made of food-grade 304 stainless steel, with chromium content of 16%, good stability, strong corrosion resistance, no rust after long-term use, and the function of insulating ice water besides hot water.
2. Pottery
Ceramic thermos cups are not very common in the insulation industry, and the price will be several times more expensive than other materials. The price of a good porcelain thermos cup may reach thousands of dollars. However, ceramic thermos cups are completely harmless and will not produce harmful metal substances like other materials.
3, purple sand
At present, the inner container of some brand products of front-end thermos cups is made of authentic pure natural purple clay (less output), and the outer layer is made of stainless steel, but it is the purple sand material that makes the thermos cups have other functions, so the thermos cups with stainless steel as the outer body and purple sand as the inner container are usually called purple sand thermos cups in the industry. Besides the basic functions, it can also make tea, which has the functions of health preservation and conditioning. Strong adaptability to sudden change of cold and heat, no burst due to sudden change of temperature, slow heat transfer and no burning.
4. Glass
Glass is a very stable substance, which is sintered from inorganic silicate. Glass is easy to clean and very safe; But the glass thermos cup has a disadvantage that it is easy to break, so it is inconvenient to carry it with you.
5. Plastic
Plastic thermos cups only have the function of heat insulation, and the heat insulation effect is far from other thermos cups. Although it can be insulated, the insulation time is short and the heat dissipation is fast, which is not suitable for autumn and winter. And in the history of the development of thermos cups, many people in the industry said that plastic thermos cups are likely to contain carcinogens and need to be purchased carefully.
To sum up, the commonly used materials in the industry are stainless steel, ceramics, purple sand, glass and plastic. As can be seen from the above, stainless steel thermos cup is the best choice now. Although ceramics have high safety performance and contain no harmful substances, they are rare in the market. Purple sand has the function of heat preservation, warm in winter and cool in summer, but authentic and pure natural purple sand mud is rare. Glass has high stability, but it is not portable and fragile; Plastic thermos cups are suspected to be carcinogens, and the insulation effect and time are also very poor, so they need to be purchased carefully.
How to choose a thermos cup?
People should pay attention to practicality when choosing a thermos cup to avoid the following two misunderstandings: First, the more expensive the thermos cup, the better; The manufacturing process of the thermos cup is not complicated; The insulation principle is basically the same; The difference may lie in the choice of materials, so the more expensive the thermos cup, the better the insulation effect. Second, the heavier the thermos, the better. Some illegal manufacturers will add sand and other things between the cup and the inner container to increase the weight. Although this kind of thermos cup is heavy, its thermal insulation effect is not good. The heavier the thermos cup, the better the insulation effect.
Choosing a thermos cup can be distinguished from the following points. Fill the cup with water, tighten the lid and turn it upside down. If the cup does not leak, it proves that the cup is well sealed. Pour boiling water into the cup, tighten the lid for a few minutes, and then touch the cup with your hand. If the cup body is hot, especially the bottom of the cup, it means that the heat preservation performance of the cup is not good. If the cup is always cold, it means that the heat preservation effect of the cup is good. You can also observe the appearance and accessories of the cup. If the cup body and inner container are smooth, without burrs and scratches, and the plastic fittings have no peculiar smell, the quality is good.
Seven points to pay attention to when purchasing thermos cups
The insulation products of cups and pots are generally divided into vacuum stainless steel and pots with mercury-plated glass liners. Vacuum stainless steel mainly uses vacuum technology to achieve heat preservation, while some pots with mercury-plated glass liners have similar moisturizing principles to hot water bottles. Like ordinary glass thermos cups and purple sand thermos cups, although they are called thermos cups, they are difficult to do and the effect is not good. Now I'd like to introduce you to the purchase of vacuum stainless steel thermos cups.
1, look at the label or description of the cup. General regular manufacturers will write product model, name, volume, material, production address, manufacturer, standard number, after-sales, usage and so on. If there is none of this, there is a problem.
2. Identify from the appearance of the thermos cup. Look at whether the surface polishing of the inner container and the outer container is uniform, and whether there are bumps, scratches and burrs; Second, see if the welding of the mouth is smooth and consistent, which is related to whether you feel comfortable when drinking water; Third, check whether the internal seal is tight and whether the plug and the cup match; Fourth, look at the mouth of the cup. The rounder the better, the immature craft will be out of round.
3. Sealing test: First unscrew the lid of the cup to see if the lid is completely consistent with the cup body, then add boiled water (preferably boiled water) to the cup, and then turn the cup upside down for two to three minutes to see if there will be water oozing out.
4. Insulation test: As the stainless steel vacuum insulation cup adopts vacuum insulation technology, it can prevent heat from being conducted to the outside under vacuum, thus achieving insulation effect. Therefore, to test the insulation effect of stainless steel vacuum thermos cup, just put boiling water into the cup, and after two or three minutes, touch all parts of the cup to see if it is hot. If any place is hot, the temperature will be lost from that place. It is normal to have a slight fever in a place like the mouth of a cup.
5. Identification of other plastic parts: The plastic used for thermos cups should all be food-grade, with small odor, bright surface, no burr, long service life and no aging. Ordinary plastics or recycled plastics are characterized by large smell, deep color and many burrs, which are easy to age and break, and will stink after a long time. This will not only shorten the life of the thermos cup, but also threaten our health.
6. Capacity detection: Because the thermos cup is double-layered, the actual capacity of the thermos cup will be different from what we see. First, see if there is little difference between the depth of the inner layer and the height of the outer layer of the thermos cup (generally 18-22mm). In order to reduce costs, many small factories often start with materials, which may affect the capacity of cups.
7. Identification of stainless steel for thermos cups: There are many kinds of stainless steel materials, among which 18/8 means that this stainless steel material contains 18% chromium and 8% nickel. The materials that meet this standard are green products that meet the national food-grade standards, and the products are rust-proof and corrosion-resistant. Ordinary stainless steel cups (pots) are light or dark in color. If it is soaked in salt water with the concentration of 1% for 24 hours, it will produce rust spots, and some elements contained in it will exceed the standard, which will directly endanger human health.