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AssigneeStora Enso OYJ
InventorsTeemu Karhu, Timo Myllys, Olav Pirttiniemi, Aimo Ojava, Päivi Määttä, Jalliina Järvinen
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The present invention relates to a method for forming a package by moulding a cardboard blank in such a manner that a margin area (2) of the blank, surrounding a middle portion (1) of the blank, is bent upwards to form side walls of the package while the middle portion forms a bottom of the package. The cardboard blank prior to moulding is provided with at least one area (4) of reduced bending stiffness being located in a transition zone (3) between the side walls and the bottom. The package is moulded from the blank so that the at least one area (4) of reduced bending stiffness is located in the bended areas between the side walls and the bottom and extend in the running direction of the bend. The invention further relates to a package and a package blank that can be used for forming said package.
A method for forming a package, wherein the package is moulded from a cardboard blank, the blank having straight sides and rounded corners, the blank comprising a margin area surrounding a middle portion, wherein the margin area is bent upwards to form side walls of the package while the middle portion forms the bottom of the package, comprising prior to moulding, providing the blank with at least two discontinuous areas of reduced bending stiffness compared to a bending stiffness of the middle portion, the at least two discontinuous areas of reduced bending stiffness being located around the middle portion of the blank, wherein the at least two discontinuous areas of reduced bending stiffness are formed as elongated areas that run parallel to the straight sides of the blank and are separated by at least one corner section and wherein the at least one corner section does not have an area of reduced bending stiffness, and molding the package from the blank so that the at least two discontinuous areas of reduced bending stiffness are located in a transition zone between the side walls and the bottom, where the blank is deformed due to moulding.
A package comprising a cardboard blank having a bottom and side walls extending upward from the bottom, the blank having straight sides and rounded corners, and at least two discontinuous areas of reduced bending stiffness compared to a bending stiffness of the bottom, the at least two discontinuous areas of reduced bending stiffness being located in a transition zone between the bottom and side walls of the package, wherein the at least two discontinuous areas of reduced bending stiffness are formed as elongated areas that run parallel to the straight sides of the blank and are separated by at least one corner section and wherein the at least one corner section does not have an area of reduced bending stiffness, and wherein the blank is deformed due to moulding.
A package blank of planar shape made of cardboard, the blank having straight sides and rounded corners, the blank comprising a middle portion and a margin area surrounding the middle portion, wherein the blank comprises at least two discontinuous areas of reduced bending stiffness compared to a bending stiffness of the middle portion, the at least two discontinuous areas of reduced bending stiffness being located around the middle portion of the blank in a transition zone between the middle portion and the margin area, wherein the at least two discontinuous areas of reduced bending stiffness are formed as elongated areas that run parallel to the straight sides of the blank and are separated by at least one corner section and wherein the at least one corner section does not have an area of reduced bending stiffness.
Dependencies are inferred from the claim text.