A suction roll of a web, or sheet of paper, configured to feed said web, or sheet, of paper along an advancing direction in a machine for converting paper, or similar products, said suction roll comprising: - a movable tubular body configured to rotate about a longitudinal rotational axis, said movable tubular body being provided with an external lateral surface and of an internal lateral surface in pneumatic communication with each other through a plurality of suction holes organized according to a predetermined number of longitudinal rows; - a fixed tubular body coaxially arranged with respect to said movable tubular body, said fixed tubular body being provided with an external lateral surface and an internal lateral surface delimiting a longitudinal cavity pneumatically connected to a suction device configured to produce a predetermined vacuum degree; - a first and at least a second sealing element (23a, 23b) arranged to longitudinally extend along said suction roll at respective angular positions; - a suction chamber in pneumatic communication with said longitudinal cavity and delimitated by said internal lateral surface of said movable tubular body and laterally by said first and second sealing members (23a, 23b), said suction chamber being configured to selectively put in pneumatic communication said longitudinal cavity with at least a row of suction holes of said plurality, at predetermined angular positions of said movable tubular body, in such a way to cause the processed sheet, or web, of paper to be sucked and to adhere at corresponding portions of said external lateral surface; wherein said movable tubular body comprises a main portion provided with at least a longitudinal seat having at least an opening and at least a removable portion (10b, 10c) configured to removably engage in said, or each, longitudinal seat, said, or each, removable portion (10b, 10c) being configured to move between an assembled configuration in which is arranged to engage in a respective longitudinal seat of said main portion, and a disassembled configuration, in which said, or each, removable portion (10b, 10c) is disengaged from said respective longitudinal seat of said main portion; and wherein said, or each removable portion (10b, 10c) has a first surface (11b, 11c) having the same radius of curvature of said external lateral surface, said suction roll being characterized in that said, or each, opening has a width equal to, or greater than the width of said first sealing member and/or said second sealing member positioned at the respective longitudinal seat, in such a way that said first sealing member and/or said second sealing member is arranged to be reached from the outside to be removed and replaced through said opening with another first sealing member and/or second sealing member. - a movable tubular body configured to rotate about a longitudinal rotational axis, said movable tubular body being provided with an external lateral surface and of an internal lateral surface in pneumatic communication with each other through a plurality of suction holes organized according to a predetermined number of longitudinal rows; - a fixed tubular body coaxially arranged with respect to said movable tubular body, said fixed tubular body being provided with an external lateral surface and an internal lateral surface delimiting a longitudinal cavity pneumatically connected to a suction device configured to produce a predetermined vacuum degree; - a first and at least a second sealing element (23a, 23b) arranged to longitudinally extend along said suction roll at respective angular positions; - a suction chamber in pneumatic communication with said longitudinal cavity and delimitated by said internal lateral surface of said movable tubular body and laterally by said first and second sealing members (23a, 23b), said suction chamber being configured to selectively put in pneumatic communication said longitudinal cavity with at least a row of suction holes of said plurality, at predetermined angular positions of said movable tubular body, in such a way to cause the processed sheet, or web, of paper to be sucked and to adhere at corresponding portions of said external lateral surface; wherein said movable tubular body comprises a main portion provided with at least a longitudinal seat having at least an opening and at least a removable portion (10b, 10c) configured to removably engage in said, or each, longitudinal seat, said, or each, removable portion (10b, 10c) being configured to move between an assembled configuration in which is arranged to engage in a respective longitudinal seat of said main portion, and a disassembled configuration, in which said, or each, removable portion (10b, 10c) is disengaged from said respective longitudinal seat of said main portion; and wherein said, or each removable portion (10b, 10c) has a first surface (11b, 11c) having the same radius of curvature of said external lateral surface, said suction roll being characterized in that said, or each, opening has a width equal to, or greater than the width of said first sealing member and/or said second sealing member positioned at the respective longitudinal seat, in such a way that said first sealing member and/or said second sealing member is arranged to be reached from the outside to be removed and replaced through said opening with another first sealing member and/or second sealing member.