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