What is the reason why the newly purchased thermos does not keep warm?

In the previous article, the editor taught you how to easily and quickly determine whether the thermos is warm when buying a thermos offline.The editor also taught you that if the thermal insulation cup you purchased starts to heat up soon after pouring hot water, it means that the thermal insulation cup is not warm.However, some friends still ask what is the reason why the newly purchased thermos cup does not keep warm? The editor will tell you today what are the reasons why the new thermos cup does not keep warm?

The first is that the production is not strictly in accordance with the standards, which is the main reason why the thermos does not keep warm.The production of thermos cups is inseparable from the welding of the inner and outer cup bodies, whether it is manufactured by the welding water swelling process or by the stretching process.

At present, most of the water cup factories use laser welding.After welding, the cup body will be loaded with getter and placed in a vacuum furnace for high temperature vacuum treatment.The air between the double layers is discharged through high temperature treatment, thereby forming a vacuum state to isolate the temperature conduction, so that the water cup has the ability to keep warm.

Among them, the most common two situations are poor welding quality and leakage welding.In this case, no matter how you vacuumize, it is useless, and the leaking place can enter the air at any time.The other is insufficient vacuum.In order to reduce costs, some factories require vacuuming for 4-5 hours at a given temperature to be complete, but it is thought to be shortened to 2 hours, which will result in incomplete vacuuming of water cups, which will directly affect the efficiency of heat preservation.

Secondly, the unreasonable product modeling structure results in poor thermal insulation of the water cup.The shape design is one aspect. For example, the square stainless steel thermos usually has a general thermal insulation effect.

In addition, the distance between the inner and outer layers of the water cup should not be less than 1.5 mm, and the closer the distance is, the thicker the cup wall material needs to be.Some water cups have structural design problems, and the distance between the two layers is less than 1 mm.Even if the inner and outer walls are stacked together due to rough workmanship, the thermal insulation performance of the water cup will deteriorate.

Finally, the water cup is deformed due to the backlog impact during transportation, which affects the heat preservation function of the water cup.Of course, there are some other reasons that can also cause the thermal insulation performance of the thermos to deteriorate, but these three situations are the ones that consumers are most exposed to on a daily basis.