Where can I buy a thermos cup in Langfang?

They are sold in all large supermarkets. At present, there are many kinds of stainless steel thermos cups on the market, and the prices vary greatly. For some consumers, if they don't understand its principle, they will often spend a lot of money to buy satisfactory products. How can I buy a high-quality thermos?

First look at the appearance of the cup. Look at whether the surface polishing of the inner container and the outer container is uniform and consistent, and whether there are bumps and scratches; Second, see whether the mouth welding is smooth and consistent, which is related to whether you feel comfortable when drinking water; Third, look at the poor quality of plastic parts. It will not only affect the service life, but also affect the hygiene of drinking water; Fourth, see if the internal seal is tight. Whether the plug and the cup match. Whether screwing in and screwing out is free and whether there is water leakage. Fill a glass of water, turn it upside down for four or five minutes or shake it hard to verify whether it leaks. Look at the thermal insulation performance, which is the main technical index of the thermos cup. Generally, you can't check according to the standard when you buy it, but you can check it by hand after filling it with hot water. After two minutes, the lower part of the non-thermos cup will heat up, while the lower part of the thermos cup is always cold.

Avoid collision and collision during use, so as not to damage the cup or plastic, resulting in insulation failure or water leakage. Tighten the plug with proper force, not too hard to avoid thread failure. When drinking coffee, tea or drinks frequently, the inner container will change color. This is a normal phenomenon and can be removed with a toothpaste toothbrush.