A Yankee dryer cylinder comprising: - a hollow shaft having a cavity and a lateral surface provided with a plurality of holes arranged to connect said cavity with the external environment, said hollow shaft being provided with: - an inlet mouth through which a flow of hot gas having a predetermined temperature, in particular a temperature higher than 100 °C, is arranged to be fed into said cavity; - an outlet mouth through which said flow of hot gas is arranged to exit said dryer cylinder; - a cylindrical shell provided with an internal surface, an internal chamber being defined between the internal surface of said cylindrical shell and said lateral surface of said hollow shaft; - a partition wall mounted within said cavity in such a way to divide said fixed hollow shaft in a feeding portion and in a discharging portion, said feeding portion being provided with at least one feeding hole arranged to feed said flow of hot gas from said cavity to said internal chamber, in such a way to hit said internal surface, said discharging portion being provided with at least one discharging hole pneumatically connected to said outlet mouth, said flow of hot gas, after having hit said internal surface of said shell, being arranged to pass through said, or each, discharging hole, from said internal chamber to said cavity, in such a way to flow outside said Yankee dryer cylinder through said outlet mouth; said Yankee dryer cylinder characterised in that said hollow shaft is a fixed hollow shaft and in that said cylindrical shell is rotatably mounted about said fixed hollow shaft. - a hollow shaft having a cavity and a lateral surface provided with a plurality of holes arranged to connect said cavity with the external environment, said hollow shaft being provided with: - an inlet mouth through which a flow of hot gas having a predetermined temperature, in particular a temperature higher than 100 °C, is arranged to be fed into said cavity; - an outlet mouth through which said flow of hot gas is arranged to exit said dryer cylinder; - an inlet mouth through which a flow of hot gas having a predetermined temperature, in particular a temperature higher than 100 °C, is arranged to be fed into said cavity; - an outlet mouth through which said flow of hot gas is arranged to exit said dryer cylinder; - a cylindrical shell provided with an internal surface, an internal chamber being defined between the internal surface of said cylindrical shell and said lateral surface of said hollow shaft; - a partition wall mounted within said cavity in such a way to divide said fixed hollow shaft in a feeding portion and in a discharging portion, said feeding portion being provided with at least one feeding hole arranged to feed said flow of hot gas from said cavity to said internal chamber, in such a way to hit said internal surface, said discharging portion being provided with at least one discharging hole pneumatically connected to said outlet mouth, said flow of hot gas, after having hit said internal surface of said shell, being arranged to pass through said, or each, discharging hole, from said internal chamber to said cavity, in such a way to flow outside said Yankee dryer cylinder through said outlet mouth;