5. Drying paint by applying the characteristics of far-infrared radiation heating

There are most examples of application in fields with great results such as drying paints and drying moisture. The coat formation of paint is made by evaporation of solvents, melting by heating, polymerization, and thermal condensation reaction, etc. Because the higher the temperature in any process, or the faster the absorption of calories, the faster the reaction is promoted, heating by infrared lamps was sometimes performed. But the infrared radiation emitted was in a short-wave near-infrared range, so it did not have much effect due to bad absorption to the paint. However, with the advent of far-infrared heaters, absorption efficiency has improved dramatically, reduced drying time, significantly reduced power consumption, miniaturized relevant facilities, and significantly improved quality and productivity.

Most of the commonly used paints have absorption bands in areas of infrared spectrum between 3 μm and 4 μm and above 6 μm, where we have the best far-infrared effects because far-infrared rays are absorb well.

In particular, cleanliness and safety are important when it comes to paint drying, so far infrared rays are best suited to this condition.

Plastic or paint, which is a polymeric material, has the characteristic of well absorbing the energy of infrared rays of 3 to 25 μm, so it matches the energy of far-infrared radiation in the long-wavelength area to have a high efficiency absorption with large heating effect.

Figure 2 shows examples of applying far-infrared radiation heating under the same condition to three steel plates of the same dimension, one of which is coated with urethane paint, another is coated with primer containing a lot of inorganic filler, and the other is not coated at all.

Despite heating under the same conditions, the temperature rise in the steel plate applied with urethane paint is quick to easily reach high temperatures. It means that urethane resin, a high-molecular material, absorbs far-infrared radiation well with a high energy absorption efficiency.

Source:

「The characteristics and efficacy of far-infrared rays」 by Ji Cheol-geun,

「Far-infrared heating & drying」 by Jeong Seong-woo, - customer center.

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