Sheet packaging matertial for producing a sealed package containing a pourable product and a package obtained therefrom

1. A rectangle-shaped sheet packaging material for producing a sealed package containing a pourable product; said sheet packaging material comprising two first boundary edges parallel to a longitudinal direction and two second boundary edges parallel to a transversal direction orthogonal to said longitudinal direction;

said sheet packaging material comprising at least a bottom transversal crease line and a top transversal crease line dividing said sheet packaging material into:

a bottom region containing a bottom crease pattern and configured to form a bottom portion of said package including a bottom panel;

a top region containing a top crease pattern; and

an intermediate region contained between said bottom transversal crease line and said top transversal crease line and interposed between said bottom region and said top region, with respect to said longitudinal direction;

said bottom transversal crease line including:

a bottom central portion;

at least one bottom end portion arranged on one side of said bottom central portion and adjacent to one of said first boundary edges; and

at least one bottom side portion, adjacent to one side of said bottom central portion and extending between said bottom central portion and said at least one bottom end portion;

said bottom crease pattern including at least a pair of slanted crease lines inclined relatively to both said longitudinal direction and said transversal direction and extending within said bottom region;

wherein said slanted crease lines have first ends pointing to one of said second boundary edges and second ends pointing to a continuous line parallel to said transversal direction and including said bottom central portion and said at least one bottom end portion of said bottom transversal crease line; said slanted crease lines delimiting, together with said at least one bottom side portion, a flap area of said sheet packaging material designed to form at least part of a lateral flap of said package;

wherein a projection of each slanted crease line on said continuous line along a respective direction parallel to said slanted crease line identifies on said continuous line one respective first point;

said bottom crease pattern further including at least a pair of longitudinal crease lines extending within said bottom region, arranged at opposite sides of said flap area relatively to said transversal direction, and defining together a folding line about which said lateral flap is designed to be folded inwardly towards said bottom panel;

a projection of each longitudinal crease line on said continuous line along a respective direction parallel to said longitudinal crease line identifies on said continuous line one respective second point, said second point being arranged at one side of said flap area and being spaced, along said transversal direction, from the corresponding first point arranged at the same one side of said flap area by a transversal offset;

wherein said bottom central portion, said at least one bottom end portion and said at least one bottom side portion of said bottom transversal crease line are co-linear with one another and with said continuous line.

2. The sheet packaging material as claimed in claim 1 , wherein each said first point is closer to said flap area than the corresponding adjacent second point.

3. The sheet packaging material as claimed in claim 1 , wherein said second points are respectively spaced from said corresponding first points by respective equal transversal offsets.

4. The sheet packaging material as claimed in claim 1 , wherein said intermediate region contains an intermediate crease pattern comprising at least one intermediate crease line configured to form a lateral edge of said main portion of said package;

wherein a projection of said intermediate crease line on said continuous line along a direction parallel to said intermediate crease line coincides with one of said first points.

5. The sheet packaging material as claimed in claim 4 , wherein said intermediate crease line intersects said bottom transversal crease line at said one of said first points.

6. The sheet packaging material as claimed in claim 5 , wherein said longitudinal crease lines intersect said bottom transversal crease line at said second points.

7. The sheet packaging material as claimed in claim 1 , wherein said slanted crease lines intersect said bottom transversal crease line at said first points.

8. The sheet packaging material as claimed in claim 1 , wherein said bottom transversal crease line is interrupted at least at each said first point, at the corresponding second point, and between each first point and the corresponding second point.

9. The sheet packaging material as claimed in claim 1 , wherein said bottom crease pattern comprises two pairs of said slanted crease lines and wherein said bottom transversal crease line comprises two bottom side portions arranged at opposite sides of said bottom central portion; said slanted crease lines delimiting, together with the corresponding bottom side portion, two respective said flap areas designed to form at least part of two respective said lateral flaps of said package;

wherein said bottom crease pattern comprises two pairs of said longitudinal crease lines, one for each pair of said slanted crease lines;

and wherein said longitudinal crease lines of each pair are arranged at opposite sides of the respective flap area.

10. A sealed package-containing a pourable product obtained from a sheet packaging material as claimed in claim 1 ; said package comprising a bottom portion, a top portion and a main portion interposed between said bottom portion and said top portion and including a plurality of side walls;

wherein said main portion is divided from said bottom portion and said top portion respectively by a bottom peripheral edge and a top peripheral edge;

and wherein said bottom transversal crease line defines said bottom peripheral edge and said top transversal crease line defines said top peripheral edge.