| 摘要 |
PROBLEM TO BE SOLVED: To provide a shell that allows deterioration with time to be reduced and that allows manufacturing cost to be reduced.SOLUTION: A method of manufacturing a shell of a rocket fireworks comprises: a first step of preparing a first cylindrical shell material 903 and a second plate-like shell material 904; a second step of placing the first shell material 903 in a press mold and placing the shell material 904 on its lower opening; and a third step of joining them at their boundary by integrally molding a shell material 902, thereby forming a hollow hemisphere whose upper part is open. |
