PAPERBOARD-MADE POLYGONAL CYLINDER AND EXPANDED PAPERBOARD FOR PAPERBOARD-MADE POLYGONAL CYLINDER

摘要

PROBLEM TO BE SOLVED: To provide a paperboard-made polygonal cylinder and an expanded paperboard for the paperboard-made polygonal cylinder that simultaneously satisfy request that the transport is possible in an expanded state, the assembly is easy, the strength is strong and the design property is superior.;SOLUTION: An upper surface paperboard part 11 and a lower surface paperboard unit 12 form a regular pentagon of one side of (a) where each vertex and each side are completely overlapped in a plan view. A side paperboard part 13 forms a rectangle having a width of a×5 while being developed in the lateral opening, and is divided equally to two band regions 131, 132 of the same configuration by one lateral valley fold line. Each band region comprises five isosceles triangles of a base length (a) where an oblique side becomes a ridge-fold line and the upper side of the band region matches a base of an isosceles triangle, and five isosceles triangles of the base length (a) making a common use of an oblique side with the five isosceles triangles and having the base of matching the lower side of the band region.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2019,JPO&INPIT