A sealing device (D) for sealing a pouched strip (N) to a cladding film (P) for obtaining a blister strip (B) has a pair of pair of heat-welding plates (10) for sealing, by heat-welding, the film (P) and the strip (N), thereby obtaining the blister strip (B). A sliding element (11), for sliding the blister strip (B) released by the pair of heat welding plates (10) is provided with a curved sliding surface (110) for receiving the blister strip (B). The device (D) further has a device (20) for forcing the blister band (B) to slide along and in contact with the curved sliding surface (110), and a device (30) for directing at least one cooling fluid to cross the sliding element (11) so as to cool the blister strip (B) during the sliding thereof along the curved sliding surface (110).

A fin sealer and method to seal a radially outwardly directed fin of a tubular web structure by directing the fin through a nip between a first and a second fin sealing rollers while communicating heat to the fin through at least one of the fin sealing rollers is provided. The fin sealer is configured to maintain a nominal face-to-face relation between an outer annulus of the first fin sealing roller and an outer annulus of the second fin sealing roller with a flexible connection between a hub element of the second fin sealing roller with the outer annulus of the second fin sealing roller.

A fin sealer and method to seal a radially outwardly directed fin of a tubular web structure by directing the fin through a nip between a first and a second fin sealing rollers while communicating heat to the fin through at least one of the fin sealing rollers is provided. The fin sealer is configured to maintain a nominal face-to-face relation between an outer annulus of the first fin sealing roller and an outer annulus of the second fin sealing roller with a flexible connection between a hub element of the second fin sealing roller with the outer annulus of the second fin sealing roller.