Can the thermos cup only hold boiling water?
Thermos bottles can only be filled with boiling water, and it is best not to use them for making tea and drinking coffee, because there is alkali in these drinks, which will corrode the inner wall. It will be bad for thermos bottles after a long time, and some fruit acids will also cause damage to thermos bottles. Since you use a thermos, you should take good care of it. If you really want to drink juice or something, buy a portable glass or resin bottle.
It is best not to make tea in a thermos cup. Most thermos cups are closed and insulated. Because of the structure of tea itself, it will ferment in a closed condition, and the fermented tea will produce some substances harmful to human body. Tea is rich in protein, fat, sugar, vitamins, minerals and other nutrients. It is a natural health beverage, which contains tea polyphenols, caffeine, tannin, tea pigment and so on, and has many pharmacological effects. Tea leaves are soaked in high-temperature water for a long time, just like boiling with warm fire, tea polyphenols, tannins and other substances will be leached in large quantities, making tea leaves rich in color and bitter in taste.
At the same time, because the water temperature has been kept high, the aromatic oil in tea will quickly volatilize in large quantities, and tannic acid and theophylline will seep out in large quantities, which not only reduces the nutritional value of tea, reduces the fragrance of tea, but also increases harmful substances. If you drink this tea for a long time, it will endanger your health and lead to many diseases of digestive system, cardiovascular system, nervous system and hematopoietic system.
Misunderstanding of buying thermos cups
1, it is generally believed that the heavier the thing, the better the quality, which is wrong. It is important because the manufacturer added other things such as disks (the current thermos bottle also applies the principle of magnetized water, that is, magnets are added to the bottom and cap of the bottle to magnetize the water. It is said that magnetized water has magical effects. If other cups are much heavier, you can feel something running inside by shaking them. That cup is definitely not a thermos. The reason why it is heavy may be that the manufacturer added sundries to increase the weight or added some heat insulation materials in order to deceive consumers. Although it will also keep warm, the insulation effect is not as good as that of the thermos cup.
It is naturally good to buy famous brand cups, but the price is more expensive. I think it's really good to have a good cost performance! The famous brand thermos cup keeps warm for 10 hour, and the ordinary brand keeps warm for about 8 hours. I think you should have a budget for your unit cost and how much quantity you need. From these, you can determine the price of the cup you need, and then you can find the one with good appearance, good insulation effect and bad brand name, which is affordable and easy to use.
Don't buy cups in the supermarket, the quality of the goods inside is also very different. Finally, find a product origin agent to buy them. First, there will be no fakes. Second, it will reduce the number of products circulating, and the price is much cheaper than that of supermarkets.