Why is the inner wall of a stainless steel thermos cup copper-plated vs. not copper-plated vs. wrapped with aluminum foil? What is the difference?

Hello everyone, today I will share some professional knowledge with you, so that you can have some judgment when buying stainless steel thermos cups in daily life. I believe that many friends will see many merchants say that the inner wall of stainless steel is copper-plated when buying thermos cups, because with this process, the thermos cup will last longer. Is it really like this?http://www.umbottle.com/en/ProductsDetail-VB-10345.html Is the inner wall of stainless steel thermos cup copper-plated? Are there any that are not copper-plated? Have you heard of the practice of wrapping a layer of aluminum foil in the inner wall interlayer?

As time goes by, the technology of the water cup market is constantly upgraded and optimized, and the production technology of the heat preservation function of stainless steel thermos cups has also experienced great development. http://www.umbottle.com/en/ProductsDetail-VB-10345.htmlVarious manufacturers have adopted a variety of processes to improve the heat preservation performance of stainless steel thermos cups and reduce production costs at the same time, which led to the title that the editor will share with you today.

Before answering the question, I would like to share with you the principle of heat preservation of stainless steel thermos. http://www.umbottle.com/en/ProductsDetail-VB-10345.htmlIf a stainless steel thermos wants to have the effect of heat preservation, it must first have a double-layer stainless steel structure, and use a vacuuming process to evacuate the air in the double-layer stainless steel interlayer to form a vacuum state before it can have the heat preservation function.

The equipment that completes the vacuuming process is commonly known as a vacuum furnace (or kiln). Early vacuum furnace production equipment has certain limitations. If you want to make the water cup completely vacuumed, it takes a longer time and energy costs, which results in low production efficiency and high production costs. http://www.umbottle.com/en/ProductsDetail-VB-10345.htmlDue to the regulations of the order production cycle, some manufacturers believe that the shortened vacuuming time will actually result in an incomplete vacuum state for the water cups produced, and the thermal insulation effect will naturally decrease. Therefore, the copper plating process is supplemented to solve this problem. The copper plating process can make up for the problem of reduced thermal insulation performance caused by reducing production time.

In the early days, copper plating technology was not as mature as it is now, and production was difficult, so the production cost was relatively high. In the face of a large number of production orders, saving a little cost on each water cup can save a huge amount of money. In contrast, some manufacturers found that wrapping the inner wall with aluminum foil seemed to have the same effect, but the cost was reduced by 60%, so many manufacturers switched to the process of using aluminum foil. http://www.umbottle.com/en/ProductsDetail-VB-10345.htmlBut later it was found that the method of using aluminum foil was not advisable. The products produced would have abnormal noise on the inner wall and ineffective insulation extension due to the difficulty in fixing the aluminum foil.

With the upgrade of vacuum equipment, more and more advanced equipment not only provides stable production quality, but also greatly improves production efficiency and reduces production costs. During this period, we have conducted many tests. http://www.umbottle.com/en/ProductsDetail-VB-10345.htmlWhile strictly following the production process standards, we found that after vacuuming and doing insulation tests on the same type of thermos cup with copper plating technology and the same type of thermos cup without any technology inside, after filling with hot water of the same volume and temperature, the temperature inside the cup with copper plating technology is only 1°C higher than that inside the cup without copper plating technology after 6 hours, 3°C higher after 12 hours, and 5°C higher after 24 hours.

Therefore, the experiment shows that with the support of the existing advanced vacuum equipment, whether the inner wall of the stainless steel thermos is copper-plated has little effect on the thermal insulation effect of the water cup. On this point of view, http://www.umbottle.com/en/ProductsDetail-VB-10345.htmlthe editor welcomes colleagues to debate.