Patent ID: 7562772

Claim:
A container blank comprising: a box part having a box front wall, a box rear wall, box side walls and a box base; a lid part having a lid front wall, a lid rear wall, lid side walls and a lid top side; and a strengthening field having a recess on each side thereof and wherein the lid rear wall is linked to the box rear wall, wherein the lid front wall is linked to the strengthening field, and wherein each recess has a top and a bottom edge, wherein both the top edge and the bottom edge are curved, wherein each recess is v-shaped, the deepest point of each recess lies roughly at mid-height of the strengthening field, and each recess extends from the top edge of the strengthening field over approximately 50 to 90% of the height of the strengthening field and wherein each recess is shaped such that upon closure of the lid part each recess interacts with an edge of a collar rim so that in the closed state of the box at least a part of the collar rim comes to rest between the outside of the lid front wall and the strengthening field, and at least a portion of the strengthening field is provided with an embossed area, and wherein the embossed area extends inwards from a top edge of the strengthening field and the top edge of each recess into the strengthening field.