Rieter Automotive (International) Ag

Anthony C Vulpitta

Thorsten Alts

William Ray Vanbemmel

The invention relates to a sound absorbent thin-layer laminate consisting of at least one open-cell support layer and a second open-cell fibre layer. The support layer consists either of a first fibre layer, especially a low-density non-woven material with a mass per unit area of less than 2,000 g/m and a thickness of less than 50 mm, or of an open-cell foam layer, especially an ultra-light plastic foam with a density of between 16 and 32 kg/m and a thickness of at least 6 mm. The second fibre layer is made of melt-blown microfibres, whose fibre diameter is approximately 1 to 10 &mgr;m, especially 2 to 5 &mgr;m. The air resistance of the thin-layer laminate is in the range of 500<R <4,000 Ns/m . According to the method for producing the thin-layer laminate a microfibre layer of melt-blown microfibres with a diameter of between 1 and 10 &mgr;m, preferably between 2 and 5 &mgr;m, is fixed to the support layer by means of a spray-on adhesive.

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Crown Point, IN, United States of America

Anthony C Vulpitta