| 摘要 |
PROBLEM TO BE SOLVED: To provide a bottomed cylindrical container integrally formed from a paper material, the container being designed such that processability is improved to allow the integral formation of the container from a paper material of low strength, wherein a water port and an air vent are made without degrading formability and strength, and fracturing and breaking are easy. SOLUTION: Pleats 6 are formed in a circumferential side wall 2 along part of its circumference or the entire circumference such that an outward fold 4 and an inward fold 5 alternate in the direction of the circumference. A crease 7 formed in the paper material in advance is located along part of each fold or the entire fold. Thus, an easy-to-tear line 8 is formed along part of each crease 7 or the entire crease 7. In manufacturing such a paper container, creases are formed along the folds in the positions where the folds are to be formed, and the easy-to-tear process line is formed along part of each crease or the entire crease. Thus, such a paper material is used. COPYRIGHT: (C)2007,JPO&INPIT
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