The Fraunhofer Institute for Process Engineering and Packaging IVV together with the Fraunhofer Institute for Applied Polymer Research IAP and the Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB will present new developments in films and the efficient control of coating processes at the upcoming International Converting Exhibition Europe ICE being held in Munich from 21 - 23 March 2017. Under the motto "Functional films – efficient coating processes", emphasis will be put on new film functionalities and accelerated test methods (Hall A5, Stand 1031).
Control and monitoring of coating processes inline - for the first time
Fraunhofer scientists study how anti-icing coatings affect the freezing behavior of water droplets in an icing chamber
© Photo Fraunhofer IGB
The development of a cost-effective, optical measuring system means that coating processes will in the future be able to be fully controlled and monitored over the entire substrate surface. The inaugural presentation of this new system developed by the Fraunhofer IAP and the Fraunhofer IVV will take place at ICE Europe 2017.
The degree of crosslinking and thickness of organic coatings can be controlled inline via automated coupling of the measurement system to the coating unit. This prevents issues such as delamination, poor processing of web-shaped materials, and increased migration of non-crosslinked adhesive components.
Accelerated test methods for high-barrier films
High-barrier laminates manufactured in roll-to-roll processes for the encapsulation of flexible solar cells and electronic components must have as low as possible oxygen and water vapor permeabilities. For quality assurance, it is a challenge to measure the permeability of such films over long periods of time.
The tests can take several months. Now, however, the Fraunhofer IVV has developed a device for measuring the permeability of ultra barrier films in combination with associated computer software for simulating the permeation process. This enables the water vapor permeability to be determined 3 to 4 times faster than with conventional methods.
Further improvement of high barrier technology using atomic layer deposition
The Fraunhofer IVV has acquired a new coating plant which utilizes atomic layer deposition to further reduce the permeability of films. Minimizing the permeability to water vapor and oxygen is the key to successful further improvement of high barrier films. Atomic layer deposition (ALD) is paving the way here. Coating via roll-to-roll processes allows high processing speeds and production efficiency to be achieved. Up until now, films with the highest barriers have been produced exclusively in vacuum processes.
The new ALD plant at the Fraunhofer IVV enables the barrier properties of films to be significantly improved. This is a further step towards meeting the permeability requirements for OLED encapsulation in the medium term. The Fraunhofer IVV is using this technology for publicly funded R&D projects and to provide industry with customized solutions and research services for the development of processes and materials.
Anti-icing films reduce damage caused by ice
The formation of ice on the rotor blades of wind turbines results in aerodynamic imbalance. In order to prevent damage, either the rotor blades must be heated or the wind turbine must be shut down. To tackle this issue, the Fraunhofer IGB has developed a number of anti-icing coatings suitable for polymer surfaces. These water-repelling microstructured and nanostructured coatings ensure that any water remains a liquid, even at temperatures below zero, resulting in a 90% reduction in ice adhesion compared to uncoated surfaces.
The trick: The surfaces provide the water molecules with no crystallization nuclei. Plasma technology is used to deposit the structured coatings onto plastic films made of impact-resistant polyurethane (PU). The coatings are not only of interest for wind turbines: these functional surfaces can also be applied to aircraft wings and solar panels. Furthermore, anti-icing coatings can also be directly applied to fabrics and plastics, for example for winter sports clothing, tents, and other outdoor articles.
Easy cleaning - printable films - water-repelling textiles
Regardless of whether the requirement is for anti-fouling and easy-to-clean surfaces, printable films, or eco-friendly water-repelling textiles, the Fraunhofer IGB usually uses plasma processes to create these new surface properties. Plasma processes allow the top layers to be removed, so generating pristine surfaces and enabling chemical functionalities or other layers to be applied.
Selection and control of the chemical processes enable the scientists at the Fraunhofer IGB to customize the surface energy and hence the wetting properties. This enables even textiles to be effectively equipped with water-repelling or oil-repelling properties – in an eco-friendly way without harmful byproducts or waste products.
"Intelligent" materials via roll-to-roll processes
Whilst the properties of most synthetic materials are fixed, many biological systems have the ability to adapt to changing environmental conditions. Materials are, however, now being developed with properties which "change" on exposure to external stimuli. These so-called "intelligent" materials change, for example, when exposed to various physical and chemical stimuli such as temperature, light intensity, and pH or due to biomolecules such as proteins. This is being achieved using special polymers developed by the Fraunhofer IAP.
This development work is being supported by surface technologies which allow even these intelligent materials to be manufactured on a large scale in roll-to-roll processes. In addition to classical methods such as corona and plasma treatment, printing methods (entire surface or structured) are widely used for the functionalization of surfaces.
Presse Institute | Fraunhofer-Gesellschaft
Clean and Efficient – Fraunhofer ISE Presents Hydrogen Technologies at the HANNOVER MESSE 2018
23.04.2018 | Fraunhofer-Institut für Solare Energiesysteme ISE
Joining metals without welding
23.04.2018 | Christian-Albrechts-Universität zu Kiel
Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.
Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.
Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
23.04.2018 | Physics and Astronomy
23.04.2018 | Physics and Astronomy
23.04.2018 | Trade Fair News