Commonly Used Dryer Cylinder of Paper Machine

• Customization: Available
• After-sales Service: Warranty
• Warranty: 1 Year
• Model NO.: Sun Hong
• Surface Treatment: Polishing
• Manufacturing Process: Casting
• Material: Stainless Steel
• Customized: Customized
• Condition: New
• Usage: Packing Paper Machine
• Process: Finishing Process Machine
• Transport Package: Exporting Stand
• Specification: made to order
• Trademark: sun hong
• Origin: China
• HS Code: 84399900

Product Description

Product Description

The dryer cylinder is the hollow cylinder made of cast iron with the covers at both ends, composing of cylinder and the cylinder head at both ends with outer diameter of mostly 1000 ~ 3000mm, during the operation, the passed steam will make the transported paper dry and ironed.

The cast iron dryer cylinder for paper machines is a key component for paper drying belonging to the Class I pressure vessels. The number of cast iron dryers is about 2/3 of the total number of pressure vessels in the paper industry. Manufacturing dryer materials are generally HT200 and HT250. In order to increase the smoothness of the paper, the outer surface of the dryer cylinder is polished and the inner surface is lighted so that the entire dryer cylinder wall is kept in a consistent thickness to ensure that the safety, balance and even heat transfer of the dryer cylinder. The role of the dryer cylinder is to dry the moisture in the paper for finishing paper.

Component

All dryer cylinders,heads and journals are made of special cast iron.Separate journals are bolted onto the dryer heads.Dryer shells are ground on 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.

Common problem

Wear of drying cylinder shaft head

Because the drying cylinder bears high temperature and pressure during operation, the shaft head of the drying cylinder is prone to wear, resulting in the failure of the equipment. The traditional repair method is to process the non-standard sleeve, which is prone to problems in the combination of non-standard sleeve and shaft diameter; Disassembly, machining and repair, long construction period and high cost.
The more mature rapid repair methods in China mainly apply polymer composite on-site rapid repair. Both the repair effect and maintenance cost are far better than traditional repair methods such as surfacing and brush plating. The maintenance time is fast, the process is simple and the cost is low.

Product Parameters

Diameter mm	Design Pressure Mpa	Material	Hardness HB	Web Width mm	Shell Thickness mm	Roughness	Working Speed M/min
1500	0.3-0.8	HT250-300	190-240	350-10000	20-30	0.2-0.4	200-1200
1800	0.3-0.8	HT250-300	190-240	350-10000	23-35	0.2-0.4	200-1200
2000	0.3-0.8	HT250-300	190-240	1350-5000	24-38	0.2-0.4	200-1200
2500	0.3-0.8	HT250-300	190-240	1350-5000	24-46	0.2-0.4	200-500
3000	0.3-0.8	HT250-300	190-240	1350-5000	28-54	0.2-0.4	200-600
3660	0.3-0.8	HT250-300	190-240	1350-5000	33-65	0.2-0.4	200-1200
3680	0.3-0.8	HT250-300	190-240	1350-5000	33-65	0.2-0.4	200-1200

Operation method

1.Mold processing:make standard split die (bilateral or unilateral positioning);
2.Surface treatment: degrease, polish and clean to ensure that the surface is clean, dry and solid;
3.Blending material: accurate proportion and uniform harmony;
4.Coating material: ensure bonding, filling and thickness;
5.Install the mold: brush the release agent, install and fix it to ensure that the excess material is extruded
6.Demoulding: after curing, dismantle the mold to clean up the excess materials. The materials can not be knocked, but can be removed by tools such as grinder and file to meet the installation requirements.

Dry Principle

The saturated steam, which is passed from the steam joint, is condensed inside the dryer cylinder and the released heat causes the dryer temperature to rise, thereby heating the sheet coated on the surface of the roll housing. The heat is transferred to the paper in contact with the surface of the paper and the dryer cylinder.

Evaporative heat release produces a large amount of condensed water. These condensate is attached to the inner surface of the dryer cylinder by centrifugal force due to the rotation of the dryer cylinder. In the case of high angular velocity, a water ring is formed, hindering the transfer of the heat to the dryer cylinder surface, then the siphon will be needed to drain the condensed water in time. In the lower speed, a water ring will not be formed, but there will be condensed water in the dryer cylinder splashing and accumulating.

Packaging & Shipping

1. International package  (Wooden case, carbon cast and pallet);

2. Container (as customer requirements);

3. It is suitable for long distance ocean transportation and some small parts can be transported by air.