Automotive Design
high-performance adhesive that adheres strongly to metal and plastic. It is long- lasting and capable of withstanding harsh conditions. However, as the adhesive has only limited resistance to extremely high temperatures and strong chemicals, these vents are less suitable for under-the- bonnet use. They are designed to be used with vehicle components that are less likely to come into contact with liquid chemicals.
Weldable vents can be made of different material combinations and in different sizes to suit the specific requirements of the intended application. They are mainly used in applications with plastic housings, and are attached by the customer using ultrasonic welding. At the weld seam a small section of the housing material melts and flows into the porous structure of the membrane, guaranteeing that the join is sealed and solid. Since the melting point of PTFE is much higher than the welding temperature, this process does not compromise the membrane. However,
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the welding process is very complex and requires specialised welding tools and qualified experts to complete the process.
Moulded parts represent a solution that is able to withstand the most challenging conditions as well as being easy to integrate. This can be achieved by adding a step to the manufacturing process. For example, insert moulding is a process that integrates the membrane directly as part of the plastic injection moulding process. The moulded parts can then be attached by snapping them into place in an opening in the housing.
Pressure equalisation of electronics and batteries in vehicles is a major challenge for carmakers. A solution is to incorporate a membrane that equalises the air inside the housing and protects it against liquids and dirt. l
Robert Chamberlain is with W L Gore & Associates, in Nottingham, UK.
www.gore.com
185x121.indd 4 For more information ✔ at
www.engineerlive.com/asia
15.07.2014 17:22:06
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