Plastics and Rubber
Food
Textiles
Paper/Pulp
Miscellaneous Processes
Note: Many applications in this field are unique and present substantially different operational parameters and characteristics. It is highly recommended that you contact our staff of knowledgeable sales engineers with specific technical questions relating to your application.
Infrared radiant heat energy can be delivered to concentrated areas at a very fast rate with individual heaters or heater arrays. Infrared energy is commonly used to heat plastics, remove moisture, cure painted finishes or heat food products. This is because plastics, organic substances and water absorb infrared energy more efficiently than other materials in industrial applications.
The efficiency of radiation heat transfer exchange between bodies depends on:
The three main modes of heat transfer are:
Electromagnetic radiation is measured in wavelength “λ” or in frequency “f”. Both quantities are related by the equation λ = c ÷ f, where "c" is the speed of light (3 x 10-8 m/s). Infrared radiation wavelengths fall outside the visible range in the electromagnetic spectrum; see adjacent figure. One micrometer, µm, is equal to 10–6 meter.
The total radiant energy “W” in watts per square centimeter emitted by an object is found with the Stefan-Boltzmann law: W = εσT4, where “ε” is the emissivity factor, “σ” is the Stefan-Boltzmann constant (5.67 × 10–12 W/cm2K4), and “T” is the surface temperature of the object in °K (0°C equals 273°K).
All matter emits radiant energy as a consequence of its finite temperature. Only at absolute zero (–273°C), when all molecular activity ceases, does matter stop emitting radiant energy. In solids and liquids, emission of radiant energy is considered a surface phenomenon, while for gases and certain semi-transparent solids, such as glass and salt crystals (at elevated temperature), emission is considered a volumetric phenomenon.
Radiant heating is regarded by many as a technology that is complicated and difficult to work with. While radiation theory can be complicated, it is far easier to apply when given the appropriate heating devices and guidance on which device best suits your application. No matter what the application needs, Tempco has the right product to satisfy your requirements.
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