How to judge the quality of the lion brand vacuum flask

How to judge the quality of vacuum flask and vacuum flask There are many varieties of stainless steel vacuum flask and vacuum flask on the market, and the prices vary greatly. For consumers, they do not understand the method of identifying the quality of vacuum flask and often buy bad products. So how to buy high-quality vacuum insulation cups and thermos flasks: Look at the appearance to see whether the inner and outer surfaces are polished uniformly, and whether there are bruises and scratches; Second, whether the mouth welding is smooth and consistent, this relationship Whether it feels comfortable when drinking water together; Third, look at the quality of the plastic parts. It will not only affect the service life, but also affect the sanitation of drinking water; Fourthly, see if the internal seal is tight. Whether the screw plug and the cup body fit properly. Whether it is easy to rotate in and out, and whether it is leaking. Fill a glass of water upside down for four or five minutes or shake it vigorously to verify that there is no leak. Thermal insulation performance This is the main technical index of the vacuum flask. Generally, it is impossible to check according to the standard when purchasing, but you can check it by hand after filling it with hot water. The lower part of the cup body will heat up two minutes after the non-insulated cup is filled with hot water, while the lower part of the insulated cup is always cool.　　 Avoid collisions and impacts during use to avoid damaging the cup or plastic, causing insulation failure or water leakage. Use proper force when tightening the screw plug, and do not rotate it excessively to avoid screw failure. When drinking coffee, tea or beverages frequently, the inner liner will change color. This is normal, and it can be removed with toothpaste and toothbrush.