- Identification of liner insulation
This is the main technical index of the thermos cup. After filling the thermos cup with boiling water, tighten the cork or cap clockwise, and touch the outer surface and lower part of the cup body with your hand after 2 ~ 3 minutes. If you find that there is obvious warming phenomenon on the cup body and upper part of the cup body, it indicates that the inner tank has lost vacuum and can not achieve good heat preservation effect.
- Identify sealing performance
Fill a glass of water, turn it upside down for four or five minutes, tighten the cover, place the cup flat on the table, or throw it several times. If there is no leakage, it indicates that the sealing performance is good; In addition, check whether the rotation of the cup cover and the cup mouth is flexible and whether there is a gap.
- Environmental protection identification of accessories
The environmental protection of plastic accessories is also a matter of concern. It can be identified by smell. If the cup is made of food grade plastic, it has small smell, bright surface, no burr, long service life and is not easy to aging; Ordinary plastics or recycled plastics have strong smell, gray color, many burrs, and plastics are easy to age and break.