| 摘要 |
PROBLEM TO BE SOLVED: To give an aesthetic property or strength, and making a box-like assembly easily only by folding and joining operation by being formed with an outside wall being contiguous with an opposite pair of respective sides at a bottom surface via a first groove and second groove, and an inside wall being contiguous with the outside wall via recessed grooves. SOLUTION: A double side wall being folded on each outside wall 31, 31 of second side surfaces 30a, 30b via recessed grooves 61a, 61b is inward folded at right angles at second grooves 60a, 60b with respect to the bottom 10, and its both ends are inward folded at right angles at third grooves 53a, 53b. After that, both end parts of a double side wall formed by inward folding first side surfaces 20a, 20b at right angles with respect to the bottom 10 at first grooves 50a, 50b, and inward folding inside walls 22, 22 at right angles at third grooves 53a, 53b in recessed grooves 51a, 51b are inward folded at 180 degrees in a manner being held between the inside walls 22, 22 and the outside walls 21, 21; subsequently, projected strips 35 provided at both the lateral sides 80 of the inside walls 22, 22 be are joined to cut parts 25 made at inside walls 32, 32.
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