Patent ID: 9505515
Filing Date: 2016-11-29
CPC Classification: B31F,B65D

Claim Text:
1. A packaging construction comprising multi-layer board material comprising a middle layer, a first outer layer attached to the middle layer and a second outer layer attached to the middle layer, said packaging construction defining a bottom side, a top side, and a plurality of side panels formed by the multi-layer board joining said bottom side and said top side so as to form a closed structure, wherein at least one edge is defined between adjacent side panels, wherein said packaging construction is formed with at least one side panel being curved and/or at least one edge being rounded, wherein the second outer layer has a lower bending stiffness according to ISO 5628 than the first outer layer for enabling bending of said board material according to a smooth continuous radius, wherein the first outer layer of the at least one curved panel and/or rounded edge displays a smooth and continuous radius without creasing and said second outer layer of the at least one curved panel and/or rounded edge is buckled by the bending, while portions of the first outer layer and the second outer layer that are not bent to form at least one curved panel and/or rounded edge, and wherein the bending stiffness of the second outer layer is defined by the equation: where EI