Parallelepipedic packing container provided with an opening arrangement
AssigneeTetra Pak International AB
InventorSven N. H. Holmstrom
Life of this patent
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Abstract
A parallelepipedic packing container of the type which is provided with a sealing fin which extends over the upper end wall of the packing container as well as over triangular, double-walled lugs adjoining this end wall. The sealing fin comprises a narrow sealing zone on the outer edge of the fin and a tearing perforation on the base line of the fin, the tearing perforation extending from the tip of one triangular lug to a point on the end wall of the packing container. The sealing fin is unsealed in the area between the narrow sealing zone and the tearing perforation, and moreover a corresponding sealing fin arranged at the base of the packing container is appreciably narrower than the sealing fin wherein the tearing perforation is arranged.
Claims8
A packing container comprising:
- a top end wall and a bottom end wall and side walls;
- first and second triangular lugs extending from opposite sides of the top end wall and overlapping the adjacent side walls;
- a first sealing fin extending along the top end wall from the tip of the first lug to the tip of the second lug, said first sealing fin being double-walled and having a base edge adjoining said top end wall and a free edge spaced from said base edge, said first sealing fin having a sealing zone;
- and
- said first sealing fin also having a perforation along said base edge, said perforation extending from the tip of one lug to a central portion of the top end wall, said first sealing fin being folded down against the top end wall after being sealed along said sealing zone, said perforation being spaced from said sealing zone, said sealing zone being located closer to said free edge of said first sealing fin than to said perforation, and opposing interior faces of said double-walled fin being unsealed along said perforation.
In a packing container having a top end wall, a bottom end wall and side walls, first and second triangular lugs extending from opposite sides of said top end wall and overlapping adjacent side walls and a sealing fin extending along said top end wall from a tip of said first lug to a tip of said second lug, the improvement comprising:
- a sealing zone adjacent a free edge of said sealing fin,
- a perforation extending along a base edge of said sealing fin from the tip of one lug to near an intersection point of two crease lines located on said top wall, and
- an unsealed area in said sealing fin extending between said perforation and said sealing zone, and wherein said sealing fin is of substantial width in relation to the width of said sealing zone so that said unsealed area is at least as wide as said sealing zone.
Dependencies are inferred from the claim text.