Coating Process

In machine coating processes, infrared or hot air is essential to a complete process chain.

In coating processes, the introduction of heat can take place before or after the actual coating material has been applied. Some methods require preheating the substrate in order to improve adhesion. Others require reaction processes to be activated by heat or supplied with sufficient heat. Frequently, solvents must be evaporated after the coating material has been applied.

Coating with Hot Air

When coating surfaces, surface pretreatment plays a key role in determining the quality and durability of the coating.


For virtually all coating processes, it is necessary to perform thorough cleaning and degreasing. Hot air can be used for drying out the residue of liquid cleaning agents and solvents, thus quickly and reliably preparing the surfaces for the next process step.

Hot air is also used for processes that occur downstream of the actual coating operation itself. For instance, some coating systems need to be heat-cured while varnish is both dried and cured utilizing hot air.

Dip Coating with Infrared


Dip coating is a standard process in the textile and paper industries. In this solvent-based process, it is necessary to dry the textile or paper. This is efficiently achieved with KRELUS infrared heaters. These heaters ensure reproducible and safe process regulation due, in large part, to their excellent controllability and short reaction times. This process step is also accomplished by utilizing IR radiation on coatings that polymerize after the dip coating process.