The difference between the seam liner and the seamless liner of the vacuum flask is mainly in the material and production process. The price of the seamless liner is more expensive. The manufacturing process of the seamless liner is an overall stretching process, which is a process of directly stretching a piece of stainless steel seamless pipe material through a combined mold into a thermos cup liner. The process is simple, but the requirements for equipment and molds are high. Sometimes if the height of the inner liner is too high, one stretch cannot be stretched, and two or even three stretches are required to complete it. The advantage is that there is no welding seam without welding, and it looks more beautiful and smooth.
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