Aeroplanes and motor cars need to be lighter to save fuel but at the same time they need to convey their passengers in total safety. The blades of wind power turbines need to be light but also very strong. Infrared heat can help to meet these requirements.
Composites heating is tested in our in-house Applications Centre.
Infrared emitters help in the welding of glass fibre-reinforced pressure tanks.
Copyright Heraeus Noblelight 2011
Fibre-reinforced plastics are modern composite materials. They consist of plastics such as polyphenyl sulphide (PPS), polyether-ether-keton (PEEK) or epoxy resins (EP), in which carbon or glass fibres are embedded.
These fibres make the components strong and rigid and the plastic matrix can absorb energy. Many highly stressed components in the automotive sector, such as steering rods, which are subjected to high torsion forces, or elements for side impact protection are made from such composites.
Infrared systems are used in the manufacture of such modern components because they heat these materials rapidly and homogenously and so shorten the processes.
Composites are all different, depending on their eventual application. Short fibre duroplasts for large bodywork parts, long fibre thermoplastics for highly stressed structural components, woven rovings for wind vanes – all of these need to be made as cost-efficiently as possible.
In the manufacture of composite materials various heating processes are required, such as for the curing of duroplastic plastics. Thermoplastics are melted by heat before fusing or heated before forming or deformation. Fibre content or orientation have significant influence on thermal conductivity, so that homogenous heating of composite materials is not a simple matter.
Infrared Emitters Heat Rapidly and Homogenously.
To date, the necessary heating processes have been carried out with conventional warm air ovens. In contrast, infrared technology offers significant benefits.Infrared emitters have very short response time, often within seconds, which makes heat controllable and helps to ensure that energy is used correctly. As the heat source needs to be switched on only when needed, this saves energy.
Infrared systems are relatively compact heating units, which can heat large components on a conveyor belt, without the need for a very large oven for the complete part.
Infrared radiation can be precisely matched to the product and process and modern numerical methods such as ray tracing and computational fluid dynamics can also help to heat large surfaces homogenously.
Composite Welding with Infrared HeatA British company uses tanks of glass fibre-reinforced polypropylene for water treatment. The cylindrical water tank is made in two halves, which are then joined together by short-wave infrared radiation. The glass fibres ensure that the tanks are as robust as possible, as, in use, they have to withstand an internal pressure of around 10 bar. However, conventional plastic welding using contact heating is very difficult as the glass fibres in the plastic are exposed by melting the surfaces and can damage the hot contact plates.
In contrast, infrared emitters transfer heat in a contact-free manner and generate the heat directly in the material. As a result, the material cannot get caught in the heat source. In practice, a module with six, short wave infrared emitters heats the ends of the prepared cylinder halves. The module is then automatically retracted and the halves with the soft, heated ends are pressed together and welded.
Tests have demonstrated that this joint withstands very high pressures up to 28 bar without breaking. Also, because of the contact-free heating, there is no need for continuous cleaning of the heat source. The total process is very energy-efficient as the infrared emitter is switched on only when heat is needed.
Energy Efficiency By Exact Matching
Infrared heating technology offers many possibilities for optimising energy usage in industrial processes:• High heat transfer capacity
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 2009, Heraeus Noblelight had an annual turnover of 71.6 Million € and employed 707 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 techniquesHeraeus
For further information please contact:Technical:
New material could lead to erasable and rewriteable optical chips
07.12.2016 | University of Texas at Austin
Porous crystalline materials: TU Graz researcher shows method for controlled growth
07.12.2016 | Technische Universität Graz
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
07.12.2016 | Health and Medicine
07.12.2016 | Life Sciences
07.12.2016 | Health and Medicine