What is the difference between the inner and outer layers of the stainless steel thermos cup with copper plating and no copper plating?

Why should the outer layer of the stainless steel inner tank be copper plated? This problem has been explained in detail in the previous article, and I will briefly talk about it here.The principle of heat preservation of stainless steel vacuum flask is to evacuate the air in the interlayer between the inner tank and the outer shell to form a vacuum state, so that the function of heat preservation can be realized.However, due to equipment and production operations, it is easy to cause incomplete vacuuming.This is why a getter is added between the interlayers, but even with a getter, there will still be an incomplete vacuum state.Then copper plating plays a role in ensuring thermal insulation.Copper has fast thermal conductivity and good reflectivity. After copper plating, some temperature locks will delay the temperature radiation to the outer layer.

Well, why copper plating I believe everyone has a preliminary understanding, what is the difference between copper plating and not copper plating?

I believe that many friends who are buying thermos cups, especially online shopping, will see that some brands of thermos will make cross-section drawings, and more emphasis will be placed on the copper plating process, but some thermos will not be displayed. Why?

First of all, copper-plated and non-copper-plated vacuum flasks are produced in the same environment, and there is no difference in short-term use.For example, add water at 96°C in a copper-plated thermos cup, and test the water cup at 65°C 6 hours after sealing;But the thermos cup without copper plating also adds water at 96°C into the cup, and the water temperature in the test cup is between 60°C and 50°C 6 hours after it is closed.At such a temperature, it is difficult for the user to feel it.

However, the difference between copper plating and copper plating will become more obvious as the use time increases.The water cup in the copper-plated water cup will drop slowly, and the water temperature without copper plating will drop rapidly.But this phenomenon tends to show a noticeable difference after 8 hours.However, the thermal insulation standard formulated by the international thermos cup industry is that the water cup at 96 °C should not be lower than 55 °C for 6-8 hours after being added to the cup and sealed.Therefore, because of this standard, many manufacturers will choose to produce thermos cups without copper plating.

Why did the early thermos cups need copper plating?That's because the early vacuuming process could not complete the vacuuming of the water cup, and the quality produced by the current vacuuming machine is much higher than the early vacuuming effect.

Then there is the lack of copper plating process, which reduces the cost of the production process.At the same time, due to the reduction of one process, the rate of defective products brought by the process is correspondingly reduced, and the production efficiency is improved.Taken together, although one process seems to be reduced, the cost is greatly reduced.Especially in the current market procurement, price is the primary consideration for procurement.In order to meet the needs of the market, the factory actively or passively chooses the process without copper plating.

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