When we buy a vacuum flask, we will find that there are two weld lines on the inner wall of the vacuum flask. No, what is the difference between the two? Does it affect the use or heat preservation effect of the thermos? Now let Haobang Cup Industry share with you the difference.

In fact, whether there are welds on the inner wall of the insulation cup depends on the production process used in the insulation cup processing. In the insulation cup industry, there are two techniques of integral stretching and seam welding and stretching. If you find welding on the inner wall of the insulation cup The seam line indicates the seam welding technology it uses. If there is no line, it uses the seamless welding overall stretching technology. The overall stretching process is a process in which a piece of stainless steel seamless pipe material is directly stretched into a thermos cup liner through a combined die. The process is simple, but the requirements for equipment and molds are high. If the overall stretching process is used to stretch the inner liner of the thermos cup, it will be more material and costly. Sometimes if the height of the inner liner is too high, one stretch cannot be stretched, and it needs to be stretched twice or even three times to complete. The advantage is that there is no welding seam without welding, and it looks more beautiful and smooth.

The welding stretching process is completed by cutting, bending, rounding and other processes with a stainless steel sheet, and then using a special longitudinal welding machine for argon arc welding to complete, you will see the first straight weld, and the other is in the The argon arc welding between the inner tank of the vacuum flask and the bottom of the inner tank needs to be completed by using a special horizontal circular seam welding machine. This is the second circular weld. After the process is completed, the vacuum flask liner leak detector will be used. One is to detect whether there is a missing welding phenomenon, and then proceed to the next process of pressing and welding with the outer tank. For the second weld, most of the vacuum cup manufacturers produced in Zhejiang use the horizontal circumferential seam welding process, so you can see two welds. The bottom of the inner tank has a curved shape, which is easier to see. To the dirt, it can be cleaned directly. The thermal insulation cup manufacturer in Guangdong uses the vertical circumferential seam welding process to weld. The bottom of the inner tank is at a right angle, so only one straight weld can be seen with the naked eye. The disadvantage is that the bottom is easy to hide dirt, invisible to the naked eye, and cannot be cleaned. Therefore, the bottom welding seam stretching process can save material and cost, and the design can have various shapes. The disadvantage is that the welding seam does not feel very beautiful, but it has little effect on the use and heat preservation performance of the vacuum flask. These two stretching processes do not have much difference in the use and insulation performance of the insulation cup. The only difference is that there is a big difference in the purchase price. The overall stretch insulation cup is more expensive than the welded and stretched insulation cup. Some, but this does not affect the use and heat preservation performance.