Your contact person

Daniel Repking
+49 5491 9691-314
d.repking@internorm.de

Cylinder coating – so important in production

Coating of plates and coils

Cylinder coatings are assigned a high priority in large-scale industrial production. The method for producing thin, homogeneous and, in some cases, high-gloss paint finishes on large surfaces (circuit boards, sheet metals, plates and foils) is regarded as an effective and low-loss solution.

There are two differences here due to the geometry of the material. Coil coating (reverse roll coating) exhibits considerable technological advantages because of the continuous operation and the simpler handling of the substrate compared with plate coating (direct roll coating). Internorm produces cylinders to match your individual metal coating requirements.

Protected coils: On our coating lines, liquid insulating materials, chemicals or paints are applied to the steel with a high precision. Coils pretreated in this way therefore have properties and surfaces that are ideal for further processing. Further costly treatment stages are thus avoided. Consequently, coated coils have good chances in the marketplace.

Fast coater change: Our roll coater in the coating chamber applies the coating directly to the top and bottom sides of the coil material. Our design advantage: the shuttle coater arrangement.

  • When changing the coating medium, the two active coating elements are simply moved away from the coil and out of the line.
  • At the same time, a new pair is moved into the line and up against the coil.
  • This fast changeover ensures an extremely short length of uncoated coil material in a continuous process with an endless coil.
  • The result is a perfect symbiosis of high productivity and flexibility. The coatings are dried in the oven. During the entire preprogrammed process, the thickness of the dry film is of course measured continuously and the plant adjusted fully automatically if necessary.This is made possible through the use of Intec RT polyurethane coatings, which prolong the service lives of pinch rolls as well as painting and conveying cylinders in the aluminium and can industries.

New method introduced: Up until now, a leap in quality had to be paid for dearly – in terms of higher prices. But now the costs have been drastically reduced thanks to a new production method for applying polyurethane coatings. Polyurethanes can be obtained from Internorm for similar prices to those of rubber cylinders.

Considerable savings: Up to 30% savings in transport and maintenance costs. The reason for this is the much longer service lives of polyurethane materials.

How these cost-savings are achieved:

  • The rotational moulding process gives us the option of applying a polyurethane coating to a prepared metal cylinder or roller core without the need for time-consuming preheating, moulding and demoulding.
  • The highly reactive Intec RT polyurethane system requires considerably shorter production times and less time for complete polymerisation, which results in less wastage of material and lower energy consumption.
  • As with the hot-casting method, profiled coatings and sandwich systems are also possible.

The good properties of polyurethane remain unaltered. Merely the method of application has been considerably improved, and the small overbuild considerably simplifies subsequent turning operations.

Cylinders and rollers coated with polyurethane using the rotational moulding process have…

  • optimum hydrolosis resistance,
  • a high wear resistance, and
  • good resistance to oils, greases and solvents.

Polyurethane coatings perform particularly well under dynamic loading, when abrasion and tear propagation resistance are critical, and when a high-quality paint finish is required.

We see excellent opportunities for applications, primarily in the steel, can and aluminium industries.In these sectors, cylinders are essential for flattening, consolidating, painting, conveying, driving and protecting.

The production method we employ ensures that the polyurethane coatings from Internorm are especially homogeneous. This is particularly important for roller and cylinder coatings that come into contact with products vulnerable to damage (e.g. painted aluminium coatings). Any unevenness in the coating here would cause permanent blemishes.

Two systems are available:

  • A product based on polyether for applications where good hydrolysis resistance is required.
  • A product based on polyester for applications in which mechanical strength, low wear and good resistance to oils and greases are important.

Best conditions:

  • Internorm’s new polyurethane coating system is a production method tailored exactly to the needs of industry.
  • The optimisation of service life without excessive extra costs is certainly worth a try!