Device for sealing the bottom or lid of an ecologically designed cardboard box using an extensible bearing element

A device (6) for sealing a lid or a bottom of a package on a package body by melting a reactivatable material using a sealing stamp (8) allowing the bonding between the walls of the bottom (4) or the lid (50) and the body (2) comprising:

• an elastomeric extensible bearing element (28) with a generally polygonal shape,
• a die (16) for shaping a bottom (4) or a lid (50), intended to receive a bottom (4) or a lid (50) stamped using the sealing stamp (8);
• a counter-die (26), intended to receive a package body (2), comprising a housing (29) receiving the extensible bearing element (28) located across from the sealing zone of the body (2) of the package and across from the sealing stamp (8);
• and
• means (P1) for inflating the extensible bearing element (28) by means of the inflation cavity (30) that are configured to cause the extension of the extension sections (36), such that the extension of the extension sections (26) causes the bearing surface (40) to be placed in contact against the box body (2),
• wherein the extensible bearing element (28) has a profile in cross-section comprising two extension sections (36) with a parallel generally elongated shape extending along an extension direction (E),
• the extension sections (36) each being connected, at one of their ends (36E), to a bearing section (38), such that the extension sections and the bearing section define an inflation cavity (30) of the extensible bearing element (28),
• the extension sections (36) being configured so as to extend along the extension direction (E) during the inflation of the extensible bearing element (28),
• the bearing section (38) comprising a substantially flat free bearing surface (40), configured to come into contact with the package body (2), the bearing surface (40) extending along a plane substantially normal to the extension direction (E).