Varnishes and coatings must be dried ever faster and ever more efficiently to meet the market’s increased demands. Drying ovens must be able to handle more and more throughput but not every heating source can keep pace.
QRC® Infrared emitters from Heraeus Noblelight being used in tests for powder curing at the Heraeus Noblelight Application Centre. Copyright Heraeus Noblelight 2009
The newly developed QRC® infrared emitter (quartz reflective coating) from Heraeus Noblelight helps to melt and cure powder coatings efficiently and can be retrofitted even in particularly tight spaces. Tests show that with the new emitters, process parameters such as temperature and homogeneity are better maintained. This means improved quality, reduced costs and, not least, improved plant energy efficiency.
Powder lacquers are often used to coat metal parts as well as plastics and wood. The lacquer is applied as a powder, is melted by heating it and finally cured. Because of increased production demands and aging heat sources, this process can easily become an expensive and energy-consuming bottleneck, which people do not want to use. Infrared systems are well-suited to increasing the through-put of existing ovens, because infrared technology uses high performance infrared emitters with high heat transfer capacity. Modern infrared systems are very compact so that they can be easily retrofitted in existing plant.
Newly developed QRC® emitters now make it even easier to cope with very little available space. In constricted spaces, the ambient temperature rises but not every heat source can tolerate high temperatures, vapours and gaseous emissions. The QRC® reflector was developed precisely for this by Heraeus Noblelight and this focuses the heat onto the material and maintains its excellent reflectivity over long operating periods.New Quartz Reflector for Stable Processes
And not least, a homogenous heating process helps to reduce costs and increase plant energy efficiency.
Infrared emitters have very fast response times, short wave and carbon emitters from Heraeus Noblelight have response times of the order of one to three seconds. This makes heat controllable and, together with temperature controls, helps to eliminate the overheating of materials. In addition, quick change-over of different types of coating with different burn-in times, is also possible in the same oven. Energy savings are also achieved when the heating source is switched on only when it is needed.
Heraeus Noblelight offers the complete spectrum of infrared heat from extremely short wave NIR to medium wave carbon infrared CIR. Heraeus has more than 40 years experience with infrared emitters and carries out practical tests with customer own materials in its own application centres to establish optimum process solutions.Heraeus Noblelight GmbH with its headquarters in Hanau and with subsidiaries in the USA, Great Britain, France, China, Australia and Puerto Rico, is one of the technology- and market-leaders in the production of specialist light sources. In 2007, Heraeus Noblelight had an annual turnover of 90 Million € and employed 666 people worldwide. The organisation develops, manufactures and markets infrared and ultraviolet emitters for applications in industrial manufacture, environmental protection, medicine and cosmetics, research, development and analytical laboratories.
Dr. Marie-Luise Bopp | Heraeus Noblelight GmbH
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