Patent ID: 7356978

Claim:
A method for producing a pack ( 1 ) for groups ( 2 ) of roll products; the method comprising at least the following steps: forming of a continuous tube of film ( 3 ) around supporting and folder means ( 4 ) which constitute a frame ( 5 ) forming a channel ( 6 ) for the passage of the product groups ( 2 ); creation of a first seal (S 1 ) on the front edges ( 7 ) of the packaging film ( 3 ), using first, transversal sealing means ( 8 ) positioned close to the front end of the frame ( 5 ); insertion in the channel ( 6 ), by pusher means ( 9 ), of a predetermined number of product groups ( 2 ), fed until they are close to the closed front end ( 7 ) of the film ( 3 ); further feeding of the product groups ( 2 ) beyond the first sealing means ( 8 ), with simultaneous feeding of the film ( 3 ) and formation of the further portion of the pack ( 1 ) beyond the frame ( 5 ); creation of a second, longitudinal seal (S 2 ) on the overlapping longitudinal edges of the film ( 3 ), by second sealing means ( 10 ), simultaneously with the further feed step; creation of a third seal (S 3 ) on the rear edges ( 11 ) of the film ( 3 ), by the first, transversal sealing means ( 8 ), designed to close the pack ( 1 ) at the rear of the product groups ( 2 ) bagged; wherein, between the step of inserting product groups ( 2 ) in the channel ( 6 ) and the further feeding of said product groups ( 2 ), there is a step of feeding the film ( 3 ) wound around the frame ( 5 ), by respective means ( 14 ); this feed step being simultaneous with and in the same direction as the feeding of the product groups ( 2 ) and designed to allow a fixed distance (D) to be maintained between the closed front end ( 7 ) of the film ( 3 ) and the front end ( 2 a ) of the product groups ( 2 ) fed forward.