When we buy a vacuum flask, we will find that there are two weld lines on the inner wall of the vacuum flask, one is straight to the bottom of the cup, the other is round at the bottom of the cup, and there are some weld lines on the inner wall of the vacuum cup. No, what is the difference between the two? Does it affect the use or heat preservation effect of the thermos? Now let Nuoshen Cup Industry share with you the difference.

 

In fact, whether there are welding seams on the inner wall of the vacuum flask depends on the production process used in the processing of the vacuum flask. In the vacuum flask industry, there are two technologies: integral stretch forming and seam welding and stretching. If you find welding on the inner wall of the vacuum flask 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 mold. The process is simple, but requires high equipment and molds. If the overall stretching process is used to stretch the inner container of the thermos cup, it will be more material and costly. Sometimes if the inner container height is too high, it cannot be stretched once, and it needs to be stretched twice or even three times. 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 stainless steel plates, and then using a special longitudinal welding machine to perform argon arc welding. You will see the first straight weld, and the other The argon arc welding of the inner tank of the vacuum flask and the bottom of the inner tank needs to be completed by a horizontal circular seam welding machine. This is the second circular weld. After the process is completed, use the vacuum flask liner leak detector to do One is to detect whether there is a missing welding phenomenon, and then proceed to the next process of pressure 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 two welds can be seen. The bottom of the inner tank has an arc shape, which is easier to see. To the dirt, it can be cleaned directly. The thermal insulation cup manufacturer in Guangdong uses the vertical circular 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 welding seam stretching process can save materials and costs, and the design can have various shapes. The disadvantage is that the welding seam does not feel very beautiful, but it does not have much influence on the use and insulation 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 stretching insulation cup is more expensive than the welding and stretching insulation cup. Some, but this does not affect the use and insulation performance.