| 摘要 |
PURPOSE: A water cup having an envelope shape is provided to be easily widened when both ends of the cup are pressured by hands while keeping the cup from bending to the left or to the right. CONSTITUTION: A water cup with an envelope shape is formed by rolling a cup paper and sealing both overlapping ends of the cup paper to form a cylinder shape. The cylinder shaped cup paper is flattened out to make the edge on the overlapping line to be placed on the center of the water cup, and then the water cup is pressed to be flattened out again to form the body(10) of the water cup having the envelope shape. The bottom part of the water cup is overlapped and sealed horizontally along a concavo-convex overlapping line(12) to form the water cup having the envelope shape so that the opening part(13) of the cup is easily widened when both edges of the water cup are pressured by hands. The bottom part of the water cup is overlapped and sealed along the concavo-convex overlapping line to keep the water cup from bending to the left or to the right. |
