In the cold winter, the thermos cup is a warm winter artifact to accompany us through long cold days. It can preserve the temperature of hot water for a long time, which brings great convenience to our life. Nowadays, there are many varieties of thermos cups on the market, and the prices vary greatly. Consumers are inevitably confused by the advertisements of various brands. So, how to choose a vacuum flask? Today, let me introduce it to you.
The thermos cup is generally a water container made of ceramic or stainless steel plus a vacuum layer. The top has a cover and is tightly sealed. The vacuum insulation layer can delay the heat dissipation of the water and other liquids contained in it, so as to achieve the purpose of heat preservation. For some consumers, they do not understand the principle, and they often spend a lot of money to buy satisfactory products. How can I buy a high-quality vacuum mug?
1. The thermal insulation of the inner liner is the main technical index of the thermos cup. Identifying the thermal insulation of the inner liner is an important criterion for purchasing a good-quality thermos. Fill the thermos cup with boiling water, tighten the cork or lid, and touch the outer and lower parts of the cup body with your hands after 2 to 3 minutes. If you find that the body and the upper part of the cup body are obviously warm, it means that the inner tank has lost its vacuum. degree, can not achieve a good thermal insulation effect.
2. Airtightness is also an important criterion for identifying a good thermos cup. Fill a thermos cup with a glass of water and turn it upside down for four or five minutes, screw the lid tightly, place the cup flat on the table, or shake it a few times. If there is no leakage, it means the sealing performance is good; then look at the cup Whether the screwing of the lid and the mouth of the cup is flexible and whether there is a gap.
3. Identification of plastic accessories. The characteristics of food-grade new plastics are small smell, bright surface, no burrs, long service life and not easy to age. Ordinary plastics or recycled plastics are characterized by strong odor, dark color, many burrs, and plastics are easy to age and break.