Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Paint and Lacquer Curing – Infrared Emitters and UV Lamps Provide an Efficient Combination

10.02.2014
Drying of varnishes on metal plates, curing of coatings on lamp housings - in the industrial sector there are numerous different coating processes.

However, for the manufacturer, this can present real challenges, as very often these manufacturing steps can be costly and energy-demanding.


Infrared heat dries, UV radiation cures – tests in our Application Centre help to define the necessary parameters.

Copyright Heraeus Noblelight, Hanau 2014

Heraeus Noblelight is showing application-focused UV lamps, infrared emitters and systems for coating curing at the PaintExpo exhibition in Karlsruhe in April. Examples of applications will show when and where a combination of UV and IR can be beneficial and what parameters must be observed.

Infrared transfers energy to materials without contact, generates heat where it is required and consequently is especially efficient in the drying of varnishes or the melting of powder coatings. In a UV curing process, polymerization, photo-initiators are activated by intensive UV light and cured in a fraction of a second.

As a result, the material is cured very quickly and the surface is dry, wear-resistant and can be subjected to further processes immediately. In some applications, the curing can be optimized and carried out more efficiently by a combination of infrared heat with UV radiation. These applications include high quality surface coatings and surfaces which must be scratch resistant.

Plastic surface are given a scratch-free coating, to impart a mirror finish. Fingerprint-resistance prevents smearing of the highly polished surfaced by fingerprints, hand cream or suntan lotions. Such coatings are often UV coatings, which need UV radiation to initiate the cross-linkage. This cross-linkage reaction occurs more efficiently at higher temperatures and can be further optimized by pre- or post-heating. For this reason, some plastic components such as radio fascias, gear sticks or lipstick casings are often pre-heated with infrared. This provides an improvement in the coating properties.

Infrared Emitters Provide Very Efficient Curing of Coatings on Many Materials
Infrared heating has already proved successful in the drying of coatings, as infrared radiation penetrates into the material, at a depth depending on the material, and dries the coating film from the inside outwards. Skin or bubble-formation on the surface is prevented and coating drying is accelerated. The result is a brilliant surface quality. Infrared emitters transfer heat in a contact-free and efficient manner, with the aid of electromagnetic waves, which generate the heat first in the coated material. Unlike hot air systems, infrared heating minimizes the adhesion of spurious particles in the sensitive coating during drying.
Radiation, which is precisely matched to the product and coating, is quickly converted into heat where it is required. It vaporizes water or other solvents, while the material and the immediate environment remain cooler. For example, medium wave infrared radiation is particularly well absorbed by water. Consequently, it is particularly good for water-based coatings.

IR heating is also ideal for web substrates such as paper, textiles and foils, where IR heat dries coatings within seconds. IR heat dries large three dimensional objects such as engine blocks or metal housings faster than some hot air systems, as metal is a very good conductor of heat and infrared emitters transfer large amounts of energy in a very short time.

UV Lamps Cure in Seconds in a Targeted Fashion

UV radiation allows UV paints, lacquers and adhesives to cure very quickly. In contrast to conventional coatings UV formulations contain little or no solvents. In a UV curing process, polymerization, photo-initiators are activated by intensive UV light. Chemical compounds are then broken down and then cross link to form new compounds. In fractions of a second, the cross-linked system is dry and abrasion-proof and is suitable for further processing.

Today, there are already light sources doped with Gallium or mercury. Their wavelengths determine the point of the curing: in the depth of the coating or on the surface. The optimum curing process is affected by different factors. The emission spectrum and intensity of the UV light source, the carrier material and ambient temperature, the nature and thickness of the material to be cured, the process speed, the distance between the material and the UV light source and, naturally, the chemical composition of the coating system must all be taken into consideration. UV light sources, precisely matched to the process, improve reliability as well as process speed, reduce the material loading and save both costs and energy.

When Should a Combination of Infrared Heat and UV Technology Be Considered?

Heat improves the mobility of molecules and so improves the curing reaction. Many processes introduce only a little heat into the coating materials, sometimes when the process runs very fast. This can be detrimental to the adhesion and stability of the coating.

UV curing is a chemical cross-linking process. By pre-heating the substrate with infrared radiation there is better adhesion and cross-linking of UV coatings. It has been shown to be beneficial to heat materials in a targeted fashion before the UV cross linking.

Infrared heat is also used to drive solvents from high gloss UV coating before curing. This is especially important with modern, water-based wet coatings. Here infrared heat is used to vaporize the water, so that the following UV radiation can cross-link the coating optimally.

A combination of IR and UV should then be considered when excellent quality is demanded or energy needs to be saved. By the innovative combination of infrared heat with UV technology the energy efficiency of the coating curing is improved on one hand and the cross-linking of UV coatings is optimized on the other hand.

The precious metals and technology group Heraeus headquartered in Hanau, Germany, is a global, family company with over 160 years of tradition. Our businesses include precious metals, materials and technologies, sensors, biomaterials and medical products, quartz glass, and specialty lighting sources. With product revenues of € 4.2 billion and precious metal trading revenues of € 16 billion in 2012, Heraeus has around 12,200 employees in more than 100 companies worldwide and 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. In 2012, Heraeus Noblelight had an annual turnover of 92.5 Million € and employed 715 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 measurement techniques.

Heraeus Noblelight acquired the Fusion UV Systems Group, headquartered in Gaithersburg, Maryland, USA, on 31 January 2013.

For further information, please contact:

Technical: Heraeus Noblelight GmbH
Reinhard-Heraeus-Ring 7
D-63801 Kleinostheim
Tel +49 6181/35-8545, Fax +49 6181/35-16 8545
E-Mail hng-infrared@heraeus.com
Press: Dr. Marie-Luise Bopp
Heraeus Noblelight GmbH,
Abteilung Marketing/Werbung
Tel +49 6181/35-8547, Fax +49 6181/35-16 8547
E-Mail marie-luise.bopp@heraeus.com

Dr. Marie-Luise Bopp | Heraeus Noblelight GmbH
Further information:
http://www.heraeus-noblelight.com/infrared

More articles from Trade Fair News:

nachricht High Resolution Laser Structuring of Thin Films at LOPEC 2017
21.03.2017 | Fraunhofer-Institut für Lasertechnik ILT

nachricht Open ecosystem for smart assistance systems
20.03.2017 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO

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: A Challenging European Research Project to Develop New Tiny Microscopes

The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.

To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Transport of molecular motors into cilia

28.03.2017 | Life Sciences

A novel hybrid UAV that may change the way people operate drones

28.03.2017 | Information Technology

NASA spacecraft investigate clues in radiation belts

28.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>