Drying of water-based lacquers
The evaporation of water from coatings can be significantly accelerated by heat input. Due to the lower thermal mass of the emitter sources, infrared paint dryers react much faster, which guarantees advantages during recipe changes and start-up processes.
The intensity maximum of the emitted IR radiation can be adjusted to the absorption maximum of the coating by using different emitter types. This results in savings in terms of time and energy consumption.
If the coating layer close to the surface is crosslinked first, the underlying coating can no longer evaporate unhindered and coating defects in the form of pinholes/boils can occur. The emission spectrum of the infrared emitters must therefore be matched to the absorption behaviour of the water-based coatings in such a way that the coating dries directed from below. This reliably prevents the formation of paint defects.
Because the coating layer is heated directly, infrared drying in the drying plant can also be used on base materials with a low maximum limit temperature (wood-based materials). The greatest potential of infrared paint drying lies in the higher energy input, which enables shorter heating and drying times, higher throughputs and lower space requirements.
IR radiation is suitable for drying numerous types of lacquer
When drying coatings on plastic, the rapid direct energy input of infrared radiation, in the wavelengths of the absorption spectra of water, ensures the heating of the water molecules. This vibration excitation results in faster drying of the applied coating. The total process time is significantly reduced compared to a convective drying oven or industrial dryer.
Types of paint: Water-based paints, fillers, primers, colour primers, insulating and decorative paints, base coats, top coats and clear coats.
Materials: PP-EPDM-T20, R-EMPP, PVC
Applications: Furniture manufacturing, window profiles, automotive industry, topcoat on rotor blades, electric motors, submersible pumps, etc.
Drying and curing of water-based coatings on wood
The drying and curing of varnishes on wood is similar to that of water-based varnishes on plastics.
The use of infrared varnish dryers results in less fibre swelling in varnishes on wood materials due to the faster removal of the water. In some cases, it has also been possible to reduce the amount of sanding required and to save a layer of lacquer. The gentle energy input prevents warpage, shrinkage cracks and blisters.
Types of coating: 1K and 2K water-based coatings, fillers, primers, colour primers, water-based UV coatings, stains of all shades.
Materials: Wood, MDF boards, chipboard
Applications: Wood and wood/aluminium window profiles, furniture production, etc.
Drying systems for your application: Paint drying with infrared in industry
IBT.Thermprocess has extensive know-how in paint processing/paint drying using infrared systems.
We support you in the new conception, equipment or retrofitting of your drying systems with infrared technology. The retrofitting of existing paint drying systems (so-called retrofit) results in considerable cost savings compared to the purchase of a new system.