Abstract: A Yankee dryer cylinder (1) having a cylindrical shell (10) having a central portion (11), a first and a second end portion (12, 13) and a longitudinal axis (101). At an internal surface (14), the cylindrical shell (10) includes a plurality of circumferential grooves (15). The cylinder (1) includes a first and a second head (20, 30) fixed, respectively, to the end portions (12, 13) of the cylindrical shell (10). The shell (10) includes a first and a second group of circumferential end grooves (15a, 15b, 15?a, 15?b) positioned respectively at the first and the second end portion (12, 13) and a third group of circumferential grooves positioned at the central portion (11). The grooves of the first and of the second group have a width that is greater than the width of the circumferential grooves positioned at the central portion, to uniformly distribute the loads in operating conditions.

Abstract: Yankee dryer cylinder (1) having a cylindrical shell made of steel (10), having a first and a second end opposite each other (11, 12) and provided with a plurality of circumferential grooves (15). The cylinder (1) includes a first and a second head (20, 30) made of cast iron and fixed respectively to the first and to the second end (11, 12) of the cylindrical shell made of steel (10). It is, furthermore, provided a hollow shaft (40) mounted inside the cylindrical shell (10) and connected to the first and to the second head (20, 30) at a first and a second end (41, 42), respectively. The cylinder is also provided with a first and a second bearing journal (50,60) fixed to the hollow shaft (40) at a respective end (41, 42).

Abstract: Yankee dryer cylinder (1) having a cylindrical shell made of steel (10), having a first and a second end opposite each other (11, 12) and provided with a plurality of circumferential grooves (15). The cylinder (1) includes a first and a second head (20, 30) made of cast iron and fixed respectively to the first and to the second end (11, 12) of the cylindrical shell made of steel (10). It is, furthermore, provided a hollow shaft (40) mounted inside the cylindrical shell (10) and connected to the first and to the second head (20, 30) at a first and a second end (41, 42), respectively. The cylinder is also provided with a first and a second bearing journal (50,60) fixed to the hollow shaft (40) at a respective end (41, 42).

Abstract: A Yankee dryer cylinder (1) having a cylindrical shell (10) having a central portion (11), a first and a second end portion (12, 13) and a longitudinal axis (101). At an internal surface (14), the cylindrical shell (10) includes a plurality of circumferential grooves (15). The cylinder (1) includes a first and a second head (20, 30) fixed, respectively, to the end portions (12, 13) of the cylindrical shell (10). The shell (10) includes a first and a second group of circumferential end grooves (15a, 15b, 15?a, 15?b) positioned respectively at the first and the second end portion (12, 13) and a third group of circumferential grooves positioned at the central portion (11). The grooves of the first and of the second group have a width that is greater than the width of the circumferential grooves positioned at the central portion, to uniformly distribute the loads in operating conditions.