A paperboard winding tube of enhanced compression stiffness and resistance to deformations leading to ovality under gravity type loading is disclosed. The paperboard winding tube may include a cylindrical body wall formed from a plurality of structural paperboard layers with at least one central structural paperboard layer disposed between at least one radially inward structural paperboard layer and at least one radially outward structural paperboard layer. The radially inward and the radially outward structural paperboard layers may be formed of a paperboard ply of a first stiffness, and the central structural paperboard layer may be formed of a paperboard ply of a second stiffness that is less than the first stiffness. The arrangement of the plurality of structural paperboard layers increases the compression stiffness of the paperboard winding tube to resist deformations leading to ovality of the cylindrical body wall under gravity type loading of the paperboard winding tube.

A paperboard winding tube of enhanced compression stiffness and resistance to deformations leading to ovality under gravity type loading is disclosed. The paperboard winding tube may include a cylindrical body wall formed from a plurality of structural paperboard layers with at least one central structural paperboard layer disposed between at least one radially inward structural paperboard layer and at least one radially outward structural paperboard layer. The radially inward and the radially outward structural paperboard layers may be formed of a paperboard ply of a first stiffness, and the central structural paperboard layer may be formed of a paperboard ply of a second stiffness that is less than the first stiffness. The arrangement of the plurality of structural paperboard layers increases the compression stiffness of the paperboard winding tube to resist deformations leading to ovality of the cylindrical body wall under gravity type loading of the paperboard winding tube.

A corewinder (100) to form a core (200) for tissue paper logs (300) from cardboard strips (201, 202) is described, the corewinder (100) comprises an unwinding station (10) adapted to unwind two or more reels (11, 12) of a cardboard strip (201, 202); a forming station (20), placed downstream of the unwinding station (10) and adapted to spirally wind at least an upper strip (201) and a lower strip (202) being unwound from the reels (11, 12) one on the other, joining them to form a tube (203); a cutting station (30) placed downstream of the forming station (20) and configured to cut the tube (203) being formed to obtain a core (200); the corewinder (100) also comprises a dispenser assembly (40) for an adhesive film (41), configured to unwind an adhesive film (41) connectable to said upper strip (201) to obtain a core (200) at least partially covered by said adhesive film.

A process to make a core (200) at least partially covered by such an adhesive film (41) and a tissue paper log (300) comprising such a core (200) are also described.

A corewinder (100) to form a core (200) for tissue paper logs (300) from cardboard strips (201, 202) is described, the corewinder (100) comprises an unwinding station (10) adapted to unwind two or more reels (11, 12) of a cardboard strip (201, 202); a forming station (20), placed downstream of the unwinding station (10) and adapted to spirally wind at least an upper strip (201) and a lower strip (202) being unwound from the reels (11, 12) one on the other, joining them to form a tube (203); a cutting station (30) placed downstream of the forming station (20) and configured to cut the tube (203) being formed to obtain a core (200); the corewinder (100) also comprises a dispenser assembly (40) for an adhesive film (41), configured to unwind an adhesive film (41) connectable to said upper strip (201) to obtain a core (200) at least partially covered by said adhesive film.

A process to make a core (200) at least partially covered by such an adhesive film (41) and a tissue paper log (300) comprising such a core (200) are also described.