| 摘要 |
It is an object of the present invention to provide a method of calculating a development plan of a paper container of deep bottom integrally formed from a single-sheet blank. According to the present invention, in order to achieve the above object, an annular rule line 6 constituting a regular polygonal shape is formed at the center of a single-sheet blank to constitute the bottom face of the paper container, and divided faces 5 to constitute the outside of the peripheral face of the paper container are formed on the outside of the annular rule line 6. The blank portions between the divided faces 5 constitute inner pleated faces 4. Each of the blank portions is folded downwards along the rule line 7 and folded upwards along the line 9, so that the blank portion is folded to define two triangles 8 with an angle phi and the overlapping portions thus obtained constitute an inner wall face 4. The lateral edges of the divided faces 5 are brought together by folding up the annular rule line 6 while folding the inner pleated faces 4 in two along the lines of symmetry 7 and 9, and the inner pleated faces are overlapped onto the divided faces, whereby a paper container is manufactured.
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