Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Combined use of UV technology and infrared heat makes paint curing even more energy-efficient

25.02.2015

Only elaborate coating processes make inks and coatings permanently nice-looking, high-gloss and scratch-resistant. These countless production steps may be a real challenge to manufacturers as they often mean substantial energy consumption and costs.

At the European Coatings Show in Nuremberg in April, Heraeus Noblelight will present application-optimised UV lamps, UV-LED systems and infrared heating solutions for efficient ink curing. Application examples show when it makes sense to combine UV and IR and which parameters need to be considered.


UV radiation cures, infrared heat dries – tests in Application Competence Centers help find the parameters for this.

(Copyright: Heraeus Noblelight, Hanau 2015)

Efficiently cross-linked with optimal use of energy

In a UV curing process – polymerisation – photoinitiators are activated by intensive UV light and cross-linked within seconds This quickly cures the material and the surface is dry, abrasion-proof and immediately ready for the next processing steps. Inks and coatings also remain permanently scratch-resistant and attractive when they are optimally and sufficiently cured. Wavelength, UV light intensity and dose must be adjusted to the photoinitiators of the ink formulation or coating.

Heraeus Noblelight offers different UV solutions for the pretreatment or curing of inks and coatings. The range includes innovative LED technology, special surface lamps (UVC Cure) or conventional UV medium-pressure lamp systems as well as microwave-powered UV lamp systems. Depending on the curing process, material and coating, ink or paint formulation, the UV radiation is adjusted to the individual process requirements.

The different UV systems emit intensive UV light in the wavelength range of 200 to 400 nanometres. The wavelengths of the lamps are optimised for the photoinitiators of the ink system or coating to achieve efficient and sufficient cross-linking. This enables higher production speeds and improved process reliability. At the end of a curing process, the surface can be processed without much delay and obtains scratch-resistant and durable qualities.

From beginning to end: Heraeus UV radiation sources accompany the entire production process

Prior to application of the coating or printing, the surface tension can be reduced and the surface energy increased by means of VUV radiation (vacuum UV). Due to the changed wetting properties that result, materials can be further processed better and faster. After that, the UV coating or printing is cured. Intensive microwave-powered UV medium-pressure systems with appropriate doping or UV-LED systems are used for this. The selection of a suitable UV solution also allows intermediate curing steps. Finally, the surface can be further improved by means of a special UVC Cure system. Similar to UV-LEDs, the system emits monochromatic UV radiation in the UVC range. This makes surfaces significantly more scratch-resistant.

Depending on the process step, different Heraeus UV solutions can be used. The use of advanced UV-LED technology is a promising option for lowering energy consumption and heat input. UV-LEDs are ozone-free and long-lasting. This makes maintenance easy and saves money. The current developments of UV-LED coatings and paints enable curing with UV-LEDs despite the monochromatic spectrum. Conventional UV technologies such as UV medium-pressure lamp systems dry and cure paints across a wide, polychromatic spectrum with a very high intensity. This allows high speeds and reliable curing processes.

Infrared emitters dry water-based coatings quite efficiently

A carbon infrared system from Heraeus Noblelight helps meet the quality requirements for coated tablet pads in aircraft. The anti-slip coating is a water-based solution which is applied to mats of paper and then needs to be dried as quickly as possible – a task efficiently achieved with high quality carbon infrared emitters.

Extensive trials have shown that a carbon infrared emitter consumes up to 30% less energy for the drying process than a conventional short-wave infrared emitter.

All carbon emitters combine efficient medium-wave radiation with high power density and expedite the drying of water-containing paints and inks with high efficiency.

The wavelength of the infrared radiation has a major influence on the thermal process. Water evaporates quite quickly when exposed to medium-wave infrared radiation. The reason for this is that medium-wave radiation is very well absorbed in water and directly converted into heat, in contrast to very short-wave, near-infrared radiation.

Infrared heat has already proven itself in the drying of coatings, as infrared radiation penetrates deeply into the material (more or less, depending on the paint system) and dries the paint film from the inside to the outside. Skin or bubble formation on the surface is prevented and the paint dries faster. The result is a brilliant surface quality. With the help of electromagnetic waves which generate heat only within the material, infrared emitters transmit heat efficiently and without contact . In contrast to hot air, this minimises the adherence of disturbing particles in the sensitive paint during drying.

When does the combination of infrared heat and UV technology make sense?

Heat improves the mobility of molecules and hence the result of the curing reaction. Some processes transmit very little heat into the paint materials, e.g. when the are running very fast. However, this may have a negative effect on adhesion and durability. UV curing is a chemical cross-linking process. By preheating the substrate with infrared radiation, adherence and cross-linking of the UV-curing paint are improved. It has proven advantageous to specifically heat materials prior to UV cross-linking.

Moreover, infrared heat is used to drive out the solvents from high-gloss UV paints prior to curing.
This has proven particularly efficient in modern water-based UV wet coatings, where infrared heat is used to evaporate water, so that UV radiation can then optimally cross-link the paint.

Combining IR and UV makes sense when energy savings or excellent quality is required. The innovative combination of infrared heat and UV technology not only improves the energy efficiency of the IR paint curing but also optimises the cross-linking of UV paints.

Heraeus, the technology group headquartered in Hanau, Germany, is a leading international family-owned company formed in 1851. We create high-value solutions for our customers, strengthening their competitiveness for the long term. Our activities focus on a number of markets: chemical and metals, energy and the environment, communications and electronics, health, mobility, and industrial applications. In fiscal year 2013, Heraeus achieved product revenue of €3.6 billion and precious metals trading revenue of €13.5 billion. With some 12,500 employees in over 110 subsidiaries worldwide, Heraeus holds a leading position in its global markets.

Heraeus Noblelight GmbH with its headquarters in Hanau and with subsidiaries in the USA, Great Britain, France, China and Australia, is one of the technology- and market-leaders in the production of specialist light sources and systems. In 2013, Heraeus Noblelight had an annual turnover of 138 Million € and employed 875 people worldwide. The organization develops, manufactures and markets infrared and ultraviolet emitters, systems and solutions for applications in industrial manufacture, environmental protection, medicine and cosmetics, research, development and analytical measurement techniques.


For more information, please contact:

Technical : Heraeus Noblelight GmbH
Heraeusstr. 12-14
D-63450 Hanau
Tel +49 6181/35-4499, Fax +49 6181/35-9926
E-Mail hng-uv@heraeus.com

Press: Juliane Henze
Heraeus Noblelight GmbH,
Abteilung Marketing/Werbung
Tel +49 6181/35-8539, Fax +49 6181/35-16 8539
E-Mail juliane.henze@heraeus.com

www.heraeus-noblelight.com

Dr. Marie-Luise Bopp | Heraeus Noblelight GmbH

More articles from Trade Fair News:

nachricht AchemAsia 2019 will take place in Shanghai
15.06.2018 | DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V.

nachricht Insects supply chitin as a raw material for the textile industry
05.06.2018 | Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB

All articles from Trade Fair News >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Research finds new molecular structures in boron-based nanoclusters

13.07.2018 | Materials Sciences

Algae Have Land Genes

13.07.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>