Infrared heating and drying technology give great opportunities

What is infrared radiation?
If you are not familiar with infrared heat radiation some theory follows.

Infrared radiation is a type of electromagnetic radiation similar to visible light, but has the highest heat up power in the whole electromagnetic spectra. The IR wavelength spectra goes from approx 0,8 μm to 1 mm and is placed between visible light ( 0,38-0,76 μm) and micro waves ( >1mm). The IR-spectra is usually divided into Short Wave (SW), Medium Wave (MW) and Long Wave (LW) according to the electric spectra diagram to the right.

The industry uses the infrared heat radiation

Industrial IR-systems normally use heat radiation within the shortwave- or medium wave area. The heat radiation can be electrically generated by rod shaped IR-lamps with a tungsten wire heated to max 2000-2500 ºC (SW), mounted in IR-heaters or heating modules. As an alternative can MW-radiation be emitted from Gas-IR modules heated by gas to approx 800-1000°C or electrically generated from MW-lamps or ceramic elements at somewhat lower temperatures.
All bodies are emitting infrared radiation corresponding to their temperature all the way down to the absolute zero point ( -273,15°C). The wavelength at which the radiation has it’s maximum decreases with increasing body temperature according to Wien’s displacement law illustrated to the right.

The displacement of the wavelength spectra explains why we can see when a body becomes hot enough to glow(~650°C) Enough of the emitted radiation will then fall into the visible light area, which the human eye can detect.

The total emitted radiation from a body( emitter) is proportional to the absolute temperature (K) in the fourth power (Stephan-Boltzmann’s law).
The practical result of these physical laws is that an IR-emitter with highest Intensity is built with short wave lamps often close packed.

Benefits with short wave IR-technology is for instance

  • Fast start up (1-2 seconds) and cooling down
  • Easy to regulate 0-100 %, important for the process control
  • High power density result in small dryers easy to install.
  • High efficiency if correctly applied and maintained. Internal and external cleanliness important as the IR-module/heater is an optical system.
  • Possibility for directed heat where you want it with adapted reflectors.
With correct choice of IR-technology for your business can your company receive a heating/drying process with a lower running cost. We measure and give proposals for a new IR-installation or upgrading an existing one.
IR-Dryer in a paper machine
IR-dryer in a paper machine

Facts about IR

The IR-radiation was discovered by Sir William Herschel in the year 1800. The industrial application came however first in the 1930s when paint on cars was dryed with lighting lamps in special reflectors.

The IR intensity was then only about 5kW/m2 compared with today's high intensity IR-dryers in the paper industry, which can give close to 600 kW/m2.


Electromagnetic spectra Right ArrowClick for larger picture

IR-spectra Right ArrowClick for larger picture

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