Automotive


In modern cars, these screens now mirror a user’s smartphone and are evolving into large touch screens controlled by hand gestures and voice commands. They must be lightweight and thin whilst sensitive to both heat and light. They also must be robust enough to pass stringent crash tests meaning they need high bonding strengths, such as those provided by Bostik’s High Performance HMPUR (Hot Melt Polyurethane Reactive) HHD 6101BK/6103BK adhesives, to withstand high shearing forces.


Molding) can be applied to the most delicate electronics at low pressures and temperatures. Encapsulating electronic components in this way protects them from environmental impacts, including vibrations from the car in motion, or they can be protected from temperatures up to 130°C with the right hotmelt.


In the future, more stringent temperature control requirements will be introduced for liquid gaskets and seals, and they will need to pass the automotive industry’s double 85


stress tests (85 per cent humidity and 85°C). The electrical conductivity of these adhesives will also need to increase. Where products on the market today conduct large electrical currents, the current standard is likely to double in the near future, greatly enhancing their performance and use by car manufacturers. But low pressure molding is not only valuable for the production of electrical components. It is increasingly being used in the production of onboard electronic components such as central driver consoles and rear seat screens.


The low pressure molding process is fast enough for the modern high-throughput production of these screens, as well as the gaskets and seals of a car’s electronics. Curing takes just a few seconds compared to traditional potting, which involves pre- mixing and can require overnight curing. The process is also lower energy, making it compatible with the most sustainable robotic manufacturing practices. Many newer liquid gaskets or seals made with adhesives, such as AU589V, are also reworkable – another major advantage. This helps manufacturers solve another issue - the ongoing global semiconductor chip shortage.


Reworkable ECUs are easier to change


and repair during auto-parts servicing. They offer manufacturers greater design flexibility because, traditionally, new molds would be made each time a component was replaced. Reworkable ECUs are applied as a liquid by robots, programmed via software to make seals and gaskets for each unique product, avoiding the need for expensive new molds to be made every time a product design is tweaked or updated. Some manufacturers already use AU589V UV-CIPG to produce their distribution units, oil pumps, and ECUs. Reworkable ECUs also improve the cost, reduce waste and enhance the sustainability of production processes. There are several ways for car


manufacturers to improve the performance of EVs. One area is reducing weight; another is controlling the temperature of vital electric components. Using liquid engineering adhesives instead of traditional gaskets and seals helps reduce weight and offers far more protection to sensitive ECUs, PCBs, and other onboard electronic components. They are also compatible with car manufacturers’ desire for flexibility and sustainability.


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TECHNICAL SUPPORT www.cieonline.co.uk. Components in Electronics May 2023 31


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