How much does a stainless steel thermos cup in Jinghong City, Xishuangbanna cost? A Jinghong Wild Elephant Valley gift cup with printing

There are many types of
Song Dynasty>stainless steel thermos cups currently on the market, and the prices vary greatly. For some consumers, they don’t understand the principle and often spend a lot of money to buy them. Not a satisfactory product. How can I buy a high-quality
宋体>vacuum thermos cup
宋体>?
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宋体>First of all, we must look at the appearance of the cup. First, check whether the surface polishing of the inner and outer tanks is uniform, whether there are bumps and scratches; second, whether the mouth welding is smooth and consistent, which is related to whether it feels comfortable when drinking water; third, whether the plastic parts are of poor quality. It will not only affect the service life, but also affect drinking water hygiene. Fourth, check whether the internal seal is tight. Whether the screw plug and cup body fit properly. Whether it can be screwed in and out freely, and whether it is leaking. Fill a cup of water and turn it upside down for four or five minutes or shake it hard a few times to verify whether there is a leak. Looking at the thermal insulation performance, this is the main technical indicator of the thermos cup. 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 that is not insulated will heat up after two minutes of filling the hot water, while the lower part of the insulated cup will always be cool.
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宋体> Avoid collisions and impacts during use to avoid damaging the cup body or plastic, causing insulation failure or water leakage. Use appropriate force when tightening the screw plug, and do not over-rotate to avoid failure of the screw. When you frequently drink coffee, tea or beverages, the inner container will change color. This is a normal phenomenon and can be removed with toothpaste and toothbrush
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