Method for manufacturing a covering structure for a tubular package and said package, covering structure and package

A support strip for covering structures of a cardboard package, said cardboard package comprising a tubular body made up of one or more layers of a cardboard material and a covering structure, said covering structure comprising a lid cardboard, a laminating part and a safety membrane,

• said support strip comprising a flat assembly of three materials, i.e.:
• a strip of cellulosic material covered with at least one reactivatable barrier material over a face thereof oriented towards said safety membrane, making up said lid cardboard,
• a plurality of laminating parts made from a material selected from a group consisting of paper and coated paper whereof a face oriented towards said lid cardboard is coated with a material having barrier and sealing properties relative to said lid cardboard, wherein said laminating material is cut to laminating parts having a shape conjugated to the shape of the opening end of the tubular body, wherein said laminating parts are arranged between said lid cardboard strip and a strip of material forming said safety membrane, and
• a strip of material forming said safety membrane, made up of a paper that is coated with at least one reactivatable barrier material on the surface thereof not oriented towards said laminating part,
• wherein said laminating part is arranged between said lid cardboard and said safety membrane in such a way to prevent sealing between the lid cardboard covered with the barrier material and the safety membrane;
• and
• wherein the strip forming the safety membrane has undergone a precutting and folding down operations of a tongue, is assembled strip by strip with the strip designed to form the lid cardboards, while being partially sealed or glued only on the lid cardboard surface portions situated between the laminating parts and the perimeters of said covering structures.

A covering structure of a cardboard package, said cardboard package comprising a tubular body made up of one or more layers of a cardboard material and a covering structure, said covering structure comprising a lid cardboard, a laminating part and a safety membrane,

• said covering structure being in the form of a flat portion comprising a flat assembly of three materials, i.e.:
• a cellulosic material covered with at least one reactivatable barrier material over a face thereof oriented towards said safety membrane, making up said lid cardboard,
• a laminating part made from a material selected from a group consisting of paper and coated paper whereof a face oriented towards said lid cardboard is coated with a material having barrier and sealing properties relative to said lid cardboard, wherein said laminating material is cut to a shape conjugated to the shape of the opening end of the tubular body, wherein said laminating part is arranged between said lid cardboard strip and a material forming said safety membrane, and
• a material forming said safety membrane, made up of a paper that is coated with at least one reactivatable barrier material on the surface thereof not oriented towards said laminating part,
• wherein said laminating part is arranged between said lid cardboard and said safety membrane in such a way to prevent sealing between the lid cardboard covered with the barrier material and the safety membrane;
• and
• wherein the safety membrane has undergone a precutting and folding down operations of a tongue, and is partially sealed or glued only on the lid cardboard surface portions situated between the laminating parts and the perimeters of said covering structures.