36 plasticisers from plastic surfaces. The plasma-treated materials can be further processed immediately after. Plasma activation modifies the surfaces of plastics, metals and other materials to increase the surface tension required for subsequent processes, such as bonding and printing. Plasma activation significantly improves wettability on material surfaces. Using atmospheric pressure plasma enables a significant improvement in surface energy on thermally sensitive surfaces. This means polymer surfaces can be easily glued, printed and coated in subsequent processes. Plasma passivation protects surfaces on metallic material from corrosion. The passivation layer created slows corrosion by increasing protection. Plasma pre-treatment can reduce the surface roughness of insulating and metallic layers without affecting their physical properties. Sealants Liquid seals have proven themselves in numerous areas as an alternative to moulded seals. This also applies to electronic components that often function under extreme conditions and need to be protected against dust, moisture, corrosive media or temperature-dependent influences. A wide variety of mostly highly viscous sealing materials is available today that can be applied with precision and repeat accuracy on increasingly complex components. This requires the dispensing system to be carefully tailored to these requirements to address directional changes, acceleration and deceleration during bead application, and a uniform transition when closing off the bead. To achieve this requires a combination of a material feed system, a dispenser and a dispensing cell. The feed and dispenser are designed for processing highly viscous sealing materials. The dispensing material is fed from the material drum via feed lines to the dispenser, which applies it continuously along the required contour on the component. Precise application of the material in three dimensions is ensured by installing the dispenser on the CNC axis system of the dispensing cell. Adhesive sealants Choosing an adhesive system that meets all of the end-product’s needs is like searching for the proverbial needle in a haystack. Material manufacturers can use their experience to help customers validate a suitable system. Modern, lightweight construction using materials such as glass and carbon-fibre composites is one of the main uses for epoxy resins for lamination of the fibre layers, but epoxy resin is also used as an adhesive for joining individual components. Epoxy resin is used as an electrical casting resin wherever protection against media and hightemperature resistance is necessary. In addition, the highly filled variants are characterised by low flammability and low ember formation in the event of thermal runaway. Epoxy resins Low-viscosity epoxy resins are usually available commercially as twocomponent systems. Focus | Battery sealing May/June 2024 | E-Mobility Engineering Plasma preparation can improve the surface for better sealing (Image courtesy of bdtronic) The Pailfeed 803 works with the Dos GP and DC803 to dispense sealant (Image courtesy of Scheugenpflug)
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