Cardboard container for solid, granular or possibly pasty products, and manufacturing method thereof

A method for production of a cardboard container, particularly for solid granular or powder products, obtained starting from first and second blanks (10), (11), according to claim 12, said method comprising the following stages:

• for said first blank (1),
• inward folding of said tongues (b) about the respective fold lines (12),
• upward folding of said isosceles trapezium portions (c, c′) around said respective fold lines (13, 13′).
• inward rotation of said triangular portions, and said first and second pairs of trapezium-shaped portions (d, e, d′, e′), about the crease lines (14, 15, 14′, 15′), respectively,
• partial superimposition of said second pair of trapezium-shaped portions (e′, e′) and said first pair of trapezium-shaped portions (e, e) and fixing by said strips (16) of glue or heat-sealing adhesive, so as to obtain a container body open at the top,
• filling of the open container body with the relative product, and
• for said second blank (11),
• upward folding at about 90° of said flaps (h) of said blank (11), having pre-cut lines (22–23),
• insertion of the blank (11) with the flaps (h) facing upwards into the open container body disposing it as such a level that its upper edge coincides with the fold lines (17, 17′) of the flaps (f, f′) of the blank (10), and
• inward folding of said flaps (f, f′) and gluing thereof to the corresponding flaps (h) of the blank (11),
• whereby said cover (9) is lowerable onto said top closure wall (8).

A blank (10) for production of a container body for containing products, comprising:

• a central rectangle (a) defining said container base (2),
• two opposed tongues (b) inwardly foldable about respective fold lines (12) coinciding with two opposite sides of the of the rectangle (a),
• two portions each shaped as an isosceles trapezium (c, c′) foldable about two other sides (13, 13′) of the rectangle (a), to form rear and front walls, respectively, of the container (1)
• two pairs of triangular portions (d, d, d′, d′) respectively adjacent said isosceles trapezium portions (c, c′) and joined thereto by means of respective crease lines (14, 14′), said triangular portions (d, d′) having vertices coinciding with corresponding vertices of said rectangle (a), being able to form said blunted corners (7) of the container (1),
• first and second pairs of connecting portions, each portion in each of said first pair and said second pair being shaped as a trapezium (e, e, e′, e′), respectively adjacent said triangular portions (d, d, d′, d′), and joined thereto by respective crease lines (15, 15′), the trapesium-shape portions in said second pair (e′, e′) being wider than the trapezium-shape portions in said first pair (e, e′) and being provided on the respective outer edges with a strip of glue or heat-sealable adhesive (16, 16′), for fixing to the corresponding trapezium-shaped portions in said first pair (e and e), to define, by superimposition of said first and second trapezium-shaped portions (e, e′), the right and left side-walls of the container body and the closure thereof,
• a plurality of flaps (f, f′), sealable on the inside, substantially shaped as isosceles trapezium, protruding respectively from said isosceles trapezium and triangular portions (c, d) and from said isosceles trapezium, triangular and second pair of trapezium-shaped portions (c′, d′, e′),
• octagonal portion (g) connected by means of a fold line (18), to one of said flaps (f, f′), to form said re-closure cover.