Telorullapinnoitus

Telorullapinnoitus is a coating technique used to apply protective or decorative coatings to cylindrical or curved substrates by means of a coating roller in contact with the rotating surface. The aim is to achieve a uniform coating thickness around the circumference and along the length of the workpiece.

Process and practice: Substrate preparation is essential, including cleaning, degreasing and surface conditioning to improve adhesion. The coating material—such as paints, varnishes, epoxies, polyurethanes, or powder coatings—must have a viscosity suitable for roller transfer. In operation, a roller deposits the coating onto a transfer roller or directly onto the rotating substrate, with thickness controlled by roller gap, pressure, speed, and coating viscosity. After application, drying or curing occurs by air, infrared or convection ovens, or UV/thermal processes depending on the material. Finishing steps may include inspection and post-coating treatments.

Materials and substrates: The method is used on cylindrical or curved substrates such as metal tubes, pipes, rollers, and other cylindrical components, as well as wooden or composite cores in some cases. It is common in metal fabrication, packaging, and printing industries where uniform coverage on round surfaces is required.

Advantages and limitations: Telorullapinnoitus provides good conformity to curved geometries and is suitable for continuous or semi-continuous production, delivering relatively uniform thickness over complex surfaces. Limitations include sensitivity to substrate geometry, potential edge bead formation at ends, the need for careful control of viscosity and speed, and the initial cost of specialized roller equipment. Material compatibility and curing requirements must be considered for each coating system.

See also: Roll coating, gravure coating, dip coating, powder coating.