| 摘要 |
PROBLEM TO BE SOLVED: To eliminate trouble for tearing an inner patch in opening and also to prevent occurrence of paper dust. SOLUTION: Between end folding pieces 12, two inner patches 2 whose edge in the width direction is formed banging outside of folding parts 13a, 13b are provided. As to the patches 2, each total width of the outer end side is attached to the folding pieces 12, and the inner end side of a free end is mounted overlapping in a required width. The end part is adhered to the overlapping part of the folding pieces 12 by folding first sealing flap 14a toward a side wall 11b side. Second sealing flap 14b is folded toward the side wall 11a side for adhering and closing the overlapping part of the folding piece 12 and the seal flap 14a. A decorative paper 3 is attached to the part where the first seal flap 14a and the second seal flap 14b overlap.
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