Sealed package containing a pourable food product and a sheet packaging material for producing a sealed package containing a pourable food product

A sheet packaging material for producing a sealed package containing a pourable food product, said packaging material having a rectangular or square configuration with two boundary edges parallel to a longitudinal direction and two other boundary edges parallel to a transversal direction orthogonal to said longitudinal direction;

• said packaging material comprising at least a bottom transversal crease line and a top transversal crease line extending transversally to said longitudinal direction and dividing the packaging material into:
• a bottom region containing a bottom crease pattern and configured to form a bottom portion of said package;
• a top region containing a top crease pattern and configured to form a top portion of said package;
• and
• an intermediate region contained between said bottom transversal crease line and said top transversal crease line, interposed between said bottom region and said top region and designed to form a main portion of said package having a plurality of side wall portions;
• wherein said bottom transversal crease line and said top transversal crease line are configured to define a bottom peripheral outline and a top peripheral outline of said package respectively dividing said bottom portion and said top portion from said main portion;
• wherein said bottom transversal crease line extends parallel to said transversal direction and includes a bottom central portion, designed to define a bottom front edge of said package, and two bottom side portions, extending on opposite sides of said bottom central portion and designed to define respective bottom side edges of said package;
• wherein said top transversal crease line includes a top central portion, designed to define a top front edge of said package, and two top side portions, extending on opposite sides of said top central portion and designed to define respective top side edges of said package;
• wherein said bottom crease pattern is configured to define a quadrilateral bottom panel of said package and said top crease pattern is configured to define a quadrilateral top panel of said package;
• characterized in that the length of said top central portion of said top transversal crease line is different from the length of said bottom central portion of said bottom transversal crease line.