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It puts forward the following design solutions. It will change the original paper flat circular button to be durable and flexible materials (such as rubber), not easy to tear. At the same time, by using the flexible material characteristics, before sealing circular button sealing, bending the circular button, and increasing the distance between the circular button and document bag / file bag. It can improve the sealing efficiency. At the same time, the two sides concave shape design of the circular button is in accordance with the man-machine engineering, and is convenient to bend the upper and lower bending.