In a blink of an eye, it was the coldest time of the year. Whether it is in the north of minus ten degrees, or in the south where the average room temperature is only a few degrees, if you can hold a thermos cup, you can drink a cup of warm hot water at any time, and you will be happy again.
The reporter visited several large supermarkets in Beijing and found that stainless steel vacuum flasks and insulation pots have been placed in the most conspicuous place on the shelves, and the price ranges from one to twenty yuan to one hundred yuan. In the small commodity wholesale market, consumers can not only find a variety of insulated cups, but also the unit can print text on the cup as a gift at the end of the year. In front of a booth, when the reporter asked about the quality of the thermos cup, the trader patted his chest to ensure that "no matter how cheap or expensive, keep warm for more than 5 hours, 10 years for return." In fact, these stainless steel prices are not the same. The quality of the thermos cup is not good. Some media have purchased several stainless steel vacuum flasks in the market and sent them to the quality inspection department for testing. The result is unexpected. No cup can be called real stainless steel. The total manganese content is beyond the standard and cannot meet the national requirements.
Dong Jinshi, secretary general of the International Food Packaging Association, said that there are many types of stainless steel products on the market, and not all products can meet national standards. In stainless steel products, chromium is rust-proof, and nickel is corrosion-resistant. Both are too low to achieve rust-proofing effects, and too high may be harmful to humans. Many manufacturers will also add excess manganese to replace other metals, seriously affecting the rust resistance of stainless steel products. Therefore, the following points should be noted when selecting stainless steel vacuum flasks:
1. The cup is round and the plastic parts have a small smell. To buy a thermos cup, first look at the appearance of the cup, whether the surface and liner are polished evenly, whether there are scratches, whether the cup mouth is round, and whether the weld is smooth. Try to screw the lid and fit it tightly with the cup.
2. After pouring hot water, the cup is not hot. Test the insulation of the vacuum flask, pour the boiling water into the cup, tighten the cap, let stand for 2-3 minutes, touch the cup by hand, and the heat insulation performance is good without heat. When adding hot water, be careful not to add too much to avoid scalding yourself when you unscrew.
3. Invert for 3 minutes and test for tightness. After adding water to the cup, tighten the cap and invert it for 3 minutes, or rub it a few times. If the lid is not twisted, water will seep out, indicating that the sealing effect is not good.
4. A little sinking material is good. The 20-meter cups sold on the market are mostly light and the appearance is bleak. When you buy them, the weight of the hand-sucking weight is relatively good.