Patent ID: 8720168

Claim:
A form-fill-seal machine comprising: a cylindrical part; a wrapping part configured to direct a sheet-shaped packaging material to wrap around the cylindrical part so that edges of the sheet-shaped packaging material overlap one another defining overlapping portions; and a conveyor unit for conveying the packaging material along the cylindrical part; a sealing unit for ultrasonically sealing the overlapping portions in a packaging material advancing direction; and a roller adapted to rotate with the packaging material moving in the packaging material advancing direction, the roller being disposed downstream of the sealing unit in a packaging material advancing direction to urge the packaging material against the cylindrical part immediately after the packaging material has passed the sealing unit while the roller rotates, wherein the roller is driven so that a roller speed at which the packaging material is conveyed by the roller is greater than a conveyor speed at which the packaging material is conveyed by the conveyor unit.