| 摘要 |
PROBLEM TO BE SOLVED: To simply close an opening part of a vessel with a lid in a vessel of a cracker formed of thick paper or the like by bending forming. SOLUTION: Powder set in the vessel 11 of this cracker 10 is exploded by pulling a pull string 4 to open the vessel by the explosion pressure. This cracker is so formed that a belt zone part 15 formed by extending a side wall part 13 of the body of the vessel 11 to the opening side is extended from the opening edge of the vessel side wall part 13 along the circumferential direction of the vessel 11 without any division, a boundary line 14 between the belt zone part 15 and the side wall part 13 is set to a mountain hold line, a line 18 extending along the outline of a triangle whose base is set to a side formed by equally dividing the boundary line 14 into a plurality of numbers and whose vertex is laid on the opposite side of the belt zone part 15 is set to the mountain fold line, and a line 19 which divides an angle formed of mutually adjoining triangular oblique sides into two is set to a valley fold line. The belt zone part 15 is thus folded inward the vessel 11 by a combination of bending the mountain fold and the valley fold of the line 14, the line 18, and the line 19 so that the vessel is closed with the lid. COPYRIGHT: (C)2004,JPO
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