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01/09/2007
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An automotive filtration specialist has introduced a nanofibre filtration medium that retains the smallest particles, including diesel exhaust particulates and fine dust, writes Roger Bishop.
Mann+Hummel says the technology effectively doubles the efficiency of cabin filters that typically use synthetic fleece media. Series production of the nanofibre is just beginning.
Particles ranging from a few nanometres to several hundred microns are trapped by the nanofibres. “We are focusing our attention on particles with a diameter of less than 2.5µm,” says Dr Pius Trautmann, head of cabin filter development at Mann+Hummel. These are the ones that can cause or aggravate some medical conditions if they the enter respiratory system.
In addition to separating dirt particles, cabin filters are combined with an active carbon layer to trap gaseous impurities. Harmful and unpleasant smelling gas molecules are held on the surface of the activated carbon where they are adsorbed.
Radial seal helps acoustic decoupling
Working with Federal Mogul Sealing Systems and DuPont, Mann+Hummel has developed and patented a radial sealing concept for cylinder head covers. It is said to offer improved sealing, optimised acoustics and the ability to design weight out.
A supporting core of stable plastic is overmoulded with an elastomer. In the same assembly process, the core is joined to the cylinder head cover and acoustic decoupling is achieved.
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Author
Roger Bishop
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Copyright European Automotive Design.
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