Importance

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Abstract

A packaging carton is made by folding a quadrilateral sheet S1 in a polyhedron having specified length, width and height with a flat flange F1 provided around its periphery so that a sealing cover can be bonded on the flange. The quadrilateral sheet comprises four inward folding lines V1 to V4 each being formed to pass two of four corner points C1 to C4 of a bottom plane B1 of the polyhedron having the specified length and width, and four outward folding lines M1 to M4 each being formed to be in parallel with each of the four inward folding lines with a distance therefrom equal to the specified height, and to have a length equal to a distance between the two of the four corner points L1 or L2 on the inward folding line in parallel therewith. In a region formed at each corners of the quadrilateral sheet between two of four side planes SD1 to SD4 formed between the four inward folding lines and the four outward folding lines, respectively, the region comprises three outward folding lines M5 to M7 forming a triangle T1 extending from a vertex P1 at one of the corner points, two outward folding lines M8 and M9 each being formed to extend from each of the other two vertices P2 and P3 of the triangle in parallel with one of the four outward folding lines forming the side plane beyond the rest of the other two vertices, and two inward folding lines each being formed to extend from an end G1 to G8 of one of the four outward folding lines forming one of the side planes to one of the other two vertices near the end.

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First Claim