Cover for packaging case, has folding lines being curved for imparting concave or convex shape to back face when side panels are folded for forming peripheral enclosure with polygon base

摘要

The cover has a back face (2) whose corners define a polygon, and side panels (3-6) bordering the back face and separated from the back face by folding lines (7-10). The folding lines are curved for imparting a concave or convex shape to the back face when the panels are folded for forming a peripheral enclosure with a polygon base. A connection unit (15) having triangular sectors (16, 17) connects the panels together.