All LEIZHAN dryer cylinders, heads and journals are made of special cast iron. Separate journals are bolted onto the dryer heads. Dryer shells are ground on the outside and turned on the inside. All dryer journals with steam or condensate pipes have insulation sleeves. The inner surfaces have grooves for the stationary siphons. The front side ends of all dryers contain manholes.

Cast iron material are excellent in durability. This is because the free form flake graphite in the cast iron material ensured its high corrosion and erosion resistance. The cast iron also has good fatigue strength under the pressure roller forces. At the same time, cast iron itself has a good surface performance, does not need metal spraying treatment like steel dryer.

Cast iron dryer cylinder diameter up to 3680mm, width up to 12000mm.Body material is HT250-HT350, the grade of ductile iron is QT400-QT600, the hardness is up to HB190-280.

Diameter	Material	Design Pressure MPa	Hardness HB	Face Length mm	Working Speed m/min	Roughness (Ra)
1500	HT250-HT350	0.3-1.1	190-240	1450-10000	500-1200	0.1-0.4
1800	HT250-HT350	0.3-1.1	190-240	1450-10000	500-1200	0.1-0.4
2000	HT250-HT350	0.3-1.1	190-240	1450-8000	500-1200	0.1-0.4
2500	HT250-HT350	0.3-1.1	220-260	1450-8000	500-1200	0.1-0.4
3000	HT350	0.3-1.1	230-260	1450-8000	500-1200	0.1-0.4
3660	HT350	0.3-1.1	230-260	1450-8000	500-1200	0.1-0.4
3800	HT350	0.3-1.1	230-260	1450-8000	500-1200	0.1-0.4

Steel dryer cylinder diameter up to 7500mm, width up to 6500mm.Body material is carbon steel.Working pressure above 1.0MPa.

Diameter	Φ3000	Φ3660	Φ3963	Φ4270	Φ4572	Φ4877	Φ5486	Φ6096	Φ6706	Φ7315
Max Linner Pressure KN/m	120	120	120	120	120	120	120	120	170	170
Max Steam Pressure MPa	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0
Max Paper Width mm	5600	5600	5600	5600	5600	5600	5600	5600	5600	5600
Design Speed m/min	1200	1500	2200	2200	2200	2200	2200	2200	2200	2200

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Paper Machine Yankee Dryer Cylinder

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