| 摘要 |
PROBLEM TO BE SOLVED: To provide a paper cup which can be prevented from being poorly molded due to an unstable shape of a bottom member, by stabilizing a shape of the bottom member. SOLUTION: This paper cup is formed in such a shape as to be joined by sandwiching a bent part of the bottom member by an inverted truncated cone-shaped barrel member, the bottom member which has the bent part provided on an outer periphery of a bottom face part by downward bending an outer peripheral edge of a blank of the bottom member composed of a circular plate, a folded part which is formed by folding back a lower end of the barrel member, and a barrel part of the barrel member. In the bottom member, a plurality of pressed and ruled lines directed to the center from the outer peripheral edge of the blank of the bottom member are formed on the blank of the bottom member in such a shape as to be directed in the same direction at regular intervals along the outer peripheral edge of the blank of the bottom member. The peripheral edge, where the pressed and ruled lines are formed, is narrowed down along the pressed and ruled lines, so that the bent part and the circular bottom face part can be formed.to its center are directed in the same direction at a predetermined spacing along the outer circumferential edge of the blank of the bottom member. The circumferential edge having the creasers thereon is squeezed along the creasers to form the bent part and the circular bottom face part. COPYRIGHT: (C)2009,JPO&INPIT
|
