Abstract: A multilayer corrugated board which can be smoothly bent from a planar state to a curved state without failure even at small radii of curvature, as well as a container made from such board. The materials and mechanical properties of the layers of the board are selected such that each layer inward of the outermost layer in the bent state buckles simultaneously and reversibly between each flute of the adjacent innermost corrugated layer.

Abstract: A multilayer corrugated board which can be smoothly bent from a planar state to a curved state without failure even at small radii of curvature, as well as a container made from such board. The materials and mechanical properties of the layers of the board are selected such that each layer inward of the outermost layer in the bent state buckles simultaneously and reversibly between each flute of the adjacent innermost corrugated layer.

Abstract: A packaging box including a base portion defining a first plane is disclosed. The packaging box includes at least one first side wall portion. The at least one first side wall portion is arranged at an angle to the base portion. The first side wall portion is joined to the base portion via a fold line at a first edge of the base portion. The first side wall portion has an extension portion extending from one side of the side wall portion so as to provide at least part of a second side wall portion arranged at an angle to the base portion and at an angle to the first side wall portion. The second side wall portion includes at least part of the extension portion. A connecting portion of the extension portion connecting the first side wall portion to the second side wall portion is smoothly curved.

Abstract: A packaging box including a base portion defining a first plane is disclosed. The packaging box includes at least one first side wall portion. The at least one first side wall portion is arranged at an angle to the base portion. The first side wall portion is joined to the base portion via a fold line at a first edge of the base portion. The first side wall portion has an extension portion extending from one side of the side wall portion so as to provide at least part of a second side wall portion arranged at an angle to the base portion and at an angle to the first side wall portion. The second side wall portion includes at least part of the extension portion. A connecting portion of the extension portion connecting the first side wall portion to the second side wall portion is smoothly curved.

Abstract: A packaging box is disclosed, able to have smoothly curved wall portions. The box includes a perimeter wall defining a void thereby. The perimeter wall includes a first fold line and a second fold line. The first fold line and the second fold line may be parallel. A distance around the perimeter wall from the first fold line to the second fold line measured in a first plane perpendicular to the first and second fold lines in a first rotational sense is the same as a distance around the perimeter wall from the first fold line to the second fold line in the first plane in a second rotational sense opposite to the first rotational sense. When the first fold line is fully unfolded, the perimeter has a continuous surface including the first fold line. A tube, blank, method and machine for forming the box are also disclosed.