Assembly for folding and heat-sealing at least one flap of packaging sheets juxtaposed against surfaces of a product

An assembly for folding and heat-sealing at least one flap of packaging sheets juxtaposed against surfaces of a product, in particular of at least one tubular portion constituted by flaps of packaging sheets which protrude with respect to opposite fronts of the product arranged on a conveyance line, comprising:

• a folding station provided with at least one folding plate which can slide along a plane that faces and is proximate to a plane that contains a front of said product from which said tubular portion of flaps of packaging sheets protrudes, said folding plate having a width that is smaller than that of said product and of said tubular portion, and with at least one folding bar which can slide along a lateral wall of said folding plate in order to abut against a respective lateral end of said tubular portion and fold it;
• at least one heat-sealing block, of shape and dimensions that are complementary to those of said lateral end of said tubular portion and movable between a passive configuration, in which the heat-sealing block is spaced apart from said lateral end, and an active configuration, in which the heat-sealing block abuts against said lateral end, following a release of said lateral end by said folding bar;
• at least one heat-sealing plate, arranged downstream of said folding station along said conveyance line.