| 摘要 |
PROBLEM TO BE SOLVED: To strengthen practically sufficient withstand load strength of a coffin main body constituted of a box body made of corrugated board configured by assembling a developed sheet of the corrugated board in a long-side direction, or a longitudinal direction.SOLUTION: A coffin made of corrugated board A is configured by folding and assembling a developed sheet (a) of the corrugated board along bending grooves (a1) through (a7). When long-side bending grooves 7a by which long-side side plate portions 2 are folded and are continuously provided on a rectangular-shaped bottom plate portion 1 to be able to be erected are formed toward a corrugated direction of corrugated central cores (a4) of the corrugated board and the long-side side plate portions 2 are folded and erected along the long-side bending grooves 7a, strengthened beam materials 9 are cured and formed at corner portions continuously provided to the bottom plate portion 1 and the long-side side plate portions 2 by pouring a filling material into cavity portions 8 of the corrugated central cores (a4) that communicate with the bottom plate portion 1 sides and long-side side plate portions 2 sides including the long-side bending grooves 7a. |
