1. Identification of insulation properties of the inner liner
This is the main technical indicator of a thermos cup. After filling it with boiling water, tighten the bottle stopper or lid clockwise. After 2-3 minutes, touch the outer surface and lower part of the cup body with your hand. If you find obvious warmth on the cup body and upper part, it means that the inner container has lost its vacuum degree and cannot achieve good insulation effect.
2. Identify sealing performance
Fill a cup of water upside down for four to five minutes, tighten the lid, place the cup flat on the table, or shake it vigorously a few times. If there is no leakage, it indicates good sealing performance; Кроме того, it is necessary to check whether the rotation between the cup lid and the cup mouth is flexible and whether there is any gap.
3. Environmental protection identification of accessories
The environmental friendliness of plastic accessories is also a concern, which can be identified by smell. If the cup is made of food grade plastic, it has a lower odor, a shiny surface, no burrs, a long service life, and is not easily aged; Ordinary plastic or recycled plastic has a strong odor, dark color, many burrs, and is prone to aging and breakage.
4. Identification of stainless steel materials
There are many specifications for stainless steel materials, among which 18/8 indicates that the composition of this stainless steel material contains 18% chromium and 8% nickel. Materials that meet this standard are green and environmentally friendly products that comply with national food grade standards. The product is rust resistant and corrosion-resistant. If the cup body is made of ordinary stainless steel cup, the color will appear white and dark. If it is soaked in 1% saline solution for 24 hours and rust spots will appear, it is said that some of the elements contained in it exceed the standard, which will directly harm human health.
