Coiled resistance wire inside a quartz glass tube; produces short wave radiation for contactless and very fast heating.
Also known as: Quartz infrared heater · Quartz tube heater · Short wave infrared emitter
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General Information
A quartz tube heater consists of coiled resistance wire placed inside a transparent quartz tube. Because quartz transmits infrared radiation almost without loss, most of the energy produced reaches the surface to be heated directly. Since there is no metal mass in between that needs to be heated, the response time is 1–3 seconds.
Short wave radiation (1.2–2.0 µm) provides high intensity and penetrates slightly below the surface of the material. This is a clear advantage in paint drying, thermoforming and print drying: the material heats more evenly throughout its mass rather than from the outside in.
The second element determining efficiency is the reflector. A gold or aluminium reflector placed behind the tube directs radiation that would otherwise be lost towards the target; gold coating gives higher reflectance than aluminium in the short wave range and remains stable at high temperatures. The reflector type is selected according to the efficiency expected from the application.
Applications
- Paint drying
- Thermoforming
- Print drying
- Adhesive curing
- Shrink wrapping
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Frequently Asked Questions
If fast start-up, high intensity and spot heating are required, choose quartz; if gentle and uniform heating over a large surface is required, ceramic infrared is suitable. Ceramic is generally preferred in plastic forming and quartz in paint drying.
Without a reflector, a significant share of a tube's radiation misses the target. A correctly chosen reflector clearly increases the energy reaching the target for the same electrical power; gold-coated reflectors are widely used with short-wave emitters.
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