The use of acoustic performing materials in the automotive industry is essential for improving comfort, safety and sound design. Innovative applications based on polyester fibres to fulfil customer's wishes are described. Emphasis is put on materials with excellent acoustic properties and they are compared with one another. Polyester fibres can be used for acoustic absorbers without any mechanical stiffness as well as for parts with high mechanical stiffness. The air sound absorption of porous material can be measured with the impedance tube and with a reverberation test room. For the tests the Cabin Alpha has been used, which is a reverberating room with reduced dimensions. Apart from absorption properties of materials the insulation in combination with heavy layer is of interest. Laboratory acoustic systems for investigating the insulation properties are the Apamat and Petite Cabine. The difference between them is the excitation. The absorption of porous materials is essentially dependant on the airflow resistifity and the material thickness. Melt-blown-fibre felts, PES-felts and mixtures of cotton with polyester fibres are used as absorbers. Melt-blown-felts show the best values. In addition to acoustical requirements also mechanical demands must be fulfilled. But also flammability, odour, formaldehyde and fogging emissions are very important for interior parts. In most cases it is no problem for PES based products to fulfil these demands. From the recycling point of view PES solutions are excellent because material recycling can be realised and this is in line with the 'end of Live Vehicles' (ELV) directive.
The universal application of polyester fibres for acoustically effective components in the car interior
Die universelle Anwendung von Polyester-Fasern für akustisch wirksame Bauteile im Fahrzeuginnenraum
2003
10 Seiten, 12 Bilder, 3 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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Tema Archiv | 1999
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