A plastic film roll includes: a convolute cardboard tube including a tubular body having a tubular body wall formed by a plurality of layers of a straight rolled cardboard sheet having a weight equal to or less than 300 gsm; a plastic film wound about the convolute cardboard tube to form a plurality of plastic film windings around the convolute cardboard tube, the plastic film windings creating a radial compression force equal to or greater than 10 bar on the tubular body wall, wherein the cardboard sheet includes a plurality of fibers, at least a majority of the fibers being substantially aligned in a tangential direction relative to the tubular body to allow the convolute cardboard tube to resist the radial compression force.

A plastic film roll includes: a convolute cardboard tube including a tubular body having a tubular body wall formed by a plurality of layers of a straight rolled cardboard sheet having a weight equal to or less than 300 gsm; a plastic film wound about the convolute cardboard tube to form a plurality of plastic film windings around the convolute cardboard tube, the plastic film windings creating a radial compression force equal to or greater than 10 bar on the tubular body wall, wherein the cardboard sheet includes a plurality of fibers, at least a majority of the fibers being substantially aligned in a tangential direction relative to the tubular body to allow the convolute cardboard tube to resist the radial compression force.

A dryer (2) for drying paper tubes (4) conveyed in a multilayer stream (W) transversely to the axis of the paper tubes (4), comprising an inlet (6) adapted to passing through it of a conveyor (3) of the multilayer stream (W), an outlet (7) adapted to passing through it of the conveyor (3) of the multilayer stream (W), at least one drying chamber (5) situated between the inlet (6) and the outlet (7), adapted to receive the conveyor (3) of the multilayer stream (W), at least one heater (8) to heat the air, at least one fan (9) to blow the heated air into the drying chamber (5). At least one wall (13, 14) of the dryer (2) is provided with at least one blowing element (15) for the heated air, and the blowing direction (R) of the heated air through the blowing element (15) is situated substantially transversely to the longitudinal axis (k) of the drying chamber (5) of the dryer (2).