What is the insulation principle of the thermal insulation glass liner of the thermos pot? How is it produced?

Hello everyone, "Dong Dong Talks About Cups" is here. Yesterday, the editor shared how colored plastic water cups are produced. Friends who are interested can look through the editor's article yesterday. http://www.zhanyict.com/en/ProductsDetail-VB-10152.htmlToday, the editor brings you new content "What is the insulation principle of the glass liner in the traditional thermos kettle? And how is it produced?"

In the previous article, I talked about the insulation principle of heat preservation. At that time, I also said that glass water cups cannot keep warm. Since glass water cups cannot keep warm, why can the glass liner in the glass kettle have the insulation function? http://www.zhanyict.com/en/ProductsDetail-VB-10152.htmlThis is mainly determined by the production process and product size. The relative volume size of the glass kettle liner is larger than that of the glass water cup. In addition, the production processes of the two different glass products are also different, so it is difficult for us to use glass water cups to have insulation function.

The traditional glass thermos kettle keeps the glass liner warm by combining a vacuum layer and a silver mirror layer.

The inner liner of a glass thermos is usually composed of two layers of glass containers. The air between the two layers is evacuated by high-temperature heating. The most common feature is that there will be a small tuft at the bottom, which is an obvious feature of achieving double-layer vacuuming. Once the small tuft is broken, the vacuum layer is destroyed, and the glass liner will no longer keep warm. Some friends will ask the editor, didn’t you say before that the glass will break if it can’t withstand the pressure of vacuuming? http://www.zhanyict.com/en/ProductsDetail-VB-10152.htmlThis is mainly for glass water cups, because most glass water cups are directly produced with pipes, and the inner liner of the thermos is formed from the pot body to the double-layer combination and then to the vacuum completion. All are carried out in a high-altitude environment, so it can be completed. The method of cutting and reprocessing a water cup cannot be achieved.

On the outside of the vacuum layer, manufacturers usually apply a layer of silver film. Since the final effect is like a mirror, many factories call this process the silver mirror process. http://www.zhanyict.com/en/ProductsDetail-VB-10152.htmlSilver mirror is a material with a high reflectivity that can reflect heat and reduce the effect of heat conduction to the outside. Silver mirror can reflect heat radiation back to the inside, which further reduces heat loss.

With the combination of the vacuum layer and the silver mirror layer, the double insurance effectively blocks the conduction and radiation of heat, so that the heat in the inner tank can be effectively maintained for a period of time, achieving the insulation effect. http://www.zhanyict.com/en/ProductsDetail-VB-10152.htmlHowever, everyone also found that the insulation time of the glass inner tank is not as long as that of the stainless steel inner tank, which is mainly limited by the material and production process.

Simply put, a glass thermal insulation liner is first made into a glass container through melting, molding, annealing and other processes at high temperature, and then the two layers of the container are fused together at high temperature, followed by high temperature to exhaust the air to achieve a vacuum state. http://www.zhanyict.com/en/ProductsDetail-VB-10152.htmlAfter the vacuum is completed and the defective products are screened out, the silver mirror coating process begins. At this point, the glass thermal insulation liner is still a semi-finished product, and the final modification of the liner is completed through polishing and other processes to meet the requirements of the finished product.