Why do most of the thermos cups we buy have a cylindrical shape?

A friend asked, why are the thermos cups we buy mostly cylindrical in appearance? Why not make it square, triangular, polygonal or special-shaped?

Why is the appearance of the thermos cup made into a cylindrical shape? Why not make something with a unique design? This is a long story to tell. Since ancient times, when humans evolved to be able to use tools, especially cooking utensils, they used more local materials. In the end, people found that cutting bamboo was the most convenient for humans to use as drinking tools. This has been passed down from ancient times to the present, so ancient inheritance is one of the reasons.

Another reason is that when people began to develop water cups, they found that cylindrical water cups were more ergonomic. Not only could they control the flow rate of water when drinking, but they were also comfortable to hold. The cylindrical water cup is the most resistant to falling and has the best heat preservation effect due to the uniform internal stress and uniform heat conduction.

The last reason is caused by the processing technology and production cost. In fact, there are still some water cups on the market that are not cylindrical. Some are inverted triangular cones, and some are square or flat square. However, there are very few thermos cups with this shape. Because the water cups There are many production processes, many of which can only be used by cylindrical water cup processors. If you want to process these special-shaped water cups, you need special equipment. However, the market’s acceptance of special-shaped water cups is limited, resulting in insufficient production of special-shaped water cups. Large, under this premise, many factories are unwilling to invest in equipment that specializes in the production of special-shaped water cups. In addition, due to the difficulty in producing special-shaped water cups and the high rate of defective products, the unit cost is much higher than that of cylindrical ones. This is why on the market More of a reason for the cylindrical water cup.