Cardboard packing box for receiving e.g. cakes, has main flap comprising stiffening deformation obtained by simple depression of external surface between cutting initiation lines to provide concave shape to surface when packing is closed

摘要

The box (10) has a main flap (12A) comprising a lens shaped stiffening deformation (20) located at a bending line/strip (L) and delimited by cutting initiation lines (21, 22) located on both sides of the bending line/strip. The initiation lines are mid-cutting lines formed from an external surface of the flap. The deformation is obtained by simple depression of the surface located between the initiation lines to provide a concave shape to the surface when a packing is closed, where the concave shape appears after and before a convex shape from remaining of the main flap along the line/strip.