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How long can a thermos cup last? Why did the thermos cup suddenly stop keeping warm?

Most people in China have the habit of drinking hot water, especially in winter. But when the temperature is too low in winter, the water will be cold soon after it is poured out, so the thermos cup is particularly important at this time. If the thermos cup you bought is not insulated, it may be for the following reasons.

How long can the thermos cup keep warm?

Different thermos cups have different heat preservation time. A good thermos can keep warm for about 12 hours, while a poor thermos can only keep warm for 1-2 hours. In fact, the general thermos can be kept for about 4-6 hours. When buying a thermos, there will be an introduction to explain how long it will be kept.

Why does the thermos cup suddenly lose its thermal insulation?

Poor sealing: If the water in the thermos cup is not hot, it is likely that the sealing is not good. After receiving water with a thermos cup, it depends on whether there is a gap in the bottle cap or other places. If the lid of the cup is not tightly closed, the water in the thermos will not be hot soon.

Air leakage in the cup: there may be problems with the material of the cup itself, and some thermos cups are defective in technology. There may be pinhole-sized holes in the inner container, which will accelerate the heat transfer between the two layers of cup walls, so the heat will be dissipated quickly.

Sand is filled in the interlayer of the thermos cup: some merchants will put some sand in the interlayer of the thermos cup in order to make it inferior. This thermos cup was still very warm when I bought it back. After a long time, the sand rubs against the inner container, which easily leads to rust of the thermos cup and poor insulation effect.

Not thermos cups: some "thermos cups" are close to listen to the buzz of bees. If you put the thermos cup in your ear, you can't hear the buzz inside the thermos cup, which means that this cup is not a thermos cup at all, and such a cup will definitely not keep warm.

Which brands of thermos cups are good?

Xiangyin brand thermos:

Price: 2 19

Features: stainless steel liner material, feel size is more appropriate, relatively speaking, this hand-held degree is the best. The cover may be layered and have a filter layer.

Tiger mugs:

Price: 208

Features: stainless steel liner material, which is the smallest and the capacity is slightly insufficient.

Gourmet brand mug:

Price: 225 pounds

Features: stainless steel liner material. Personally, I think the biggest feature of gourmet chefs is that their caliber is particularly enlarged ~ it is very suitable for soaking big things like lemon grosvenor momordica.

Supor brand thermos cup:

Price: 109

Features: stainless steel liner material, relatively large capacity, characterized by a rubber ring next to the cup mouth to prevent burns, more user-friendly.

Will the thermos cup keep warm all the time

The insulation effect of the thermos cup will gradually deteriorate with the increase of time. Vacuum pumping can't achieve absolute vacuum, so a getter will be added to the cup to absorb the residual air. The getter has a "shelf life", and the natural heat preservation effect will become worse after the quality guarantee.

What if the thermos cup is not insulated? Use it as an ordinary cup. The thermos cup can't be maintained without insulation, but it can still be used from the perspective of the cup. Although the heat preservation time is not ideal, it is still a good cup. If it has special significance, it can still be used, but the heat preservation time is short, but it is still intact. This is also a low-carbon life and a healthy life.

Are imported thermos cups necessarily better than domestic ones?

Not necessarily. Domestic brands and foreign brands do not have the same insulation effect as everyone imagined. After all, vacuuming is not a great technology. Of course, lax quality control and lack of attention to technology are common problems in China, and details determine quality! As the saying goes, you get what you pay for, but compared with domestic thermos cups, the price of foreign brands is often several times that of domestic brands, but the insulation effect may only be two hours more.

How to choose a thermos cup

The quality of thermos cups on the market is mixed. It is suggested to focus on the thermal insulation performance of the liner structure, the sealing degree between the lid and the bottle, and whether the material releases harmful substances. , can be identified by four strokes.

Identification of inner container insulation: this is the main technical index of the thermos cup. After filling with boiling water, tighten the bottle stopper or bottle cap clockwise, and touch the outer surface of the cup body and the lower part of the cup body with your hands after 2~3 minutes. If it is found that the cup body and the upper part of the cup body are obviously warm, it means that the inner container has lost its vacuum degree and cannot achieve good heat preservation effect.

Identification of sealing performance: Fill a glass of water for four or five minutes, tighten the lid, put the cup flat on the table, or shake it hard a few times. If there is no leakage, the sealing performance is good; In addition, it depends on whether the rotation of the lid and the mouth of the cup is flexible and whether there is a gap.

Identification of environmental protection of accessories: the environmental protection of plastic accessories is also a problem worthy of attention, which can be identified by smell. If the cup is made of food-grade plastic, it has small smell, bright surface, no burr and long service life. Ordinary plastic or recycled plastic has a big smell, dark color and many burrs, and the plastic is easy to age and break.

Identification of stainless steel materials: There are many specifications of stainless steel materials, including 18/8.