| 摘要 |
A sound absorbent laminate, which comprises an open porous fibrous or foam backing layer and a further open porous melt-blown microfiber layer and which has a specified air flow resistance, is new. - DETAILED DESCRIPTION - A sound absorbent thin layer laminate has an air flow resistance Rt of 500-4000 Ns/m3 (exclusive) and comprises (a) an open porous backing layer consisting of a first fibrous layer, especially of lightly compressed nonwoven fabric of less than 2000 g/m2 weight and less than 50 mm thickness, or an open porous foam layer, especially of an ultra-lightweight plastic foam of 16-32 kg/m3 density and at least 6 mm thickness; and (b) a further open porous fibrous layer of melt-blown microfibers of 1-10 (especially 2-5) mu m diameter. An INDEPENDENT CLAIM is also included for production of the above laminate by using a sprayed adhesive to fix the microfiber layer onto the backing layer. |
