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 ; <EOS>