Absorptive sound insulation

Abstract

An absorption sound insulation for motor vehicle interiors and luggage compartments with absorption/stiffening nonwovens or 3D absorbers is formed of partially or completely cellulose wool, and includes a wear layer, and an absorbent/stiffening nonwoven fabric laminated thereunder formed of rayon of solid individual phases having a multi-leg cross-sectional shape with at least three legs, in which the legs of the cross-sectional profile each have a length/width ratio of at least 2:1 and the individual titre is 0.5 to 5 dtex.

Claims

1. An absorptive sound insulation for the motor vehicle interior and luggage compartment comprising (a) a wear layer, and (b) an absorbent/stiffening nonwoven fabric laminated thereunder comprising rayon of solid individual phases having a multi-leg cross-sectional shape with at least three legs, in which the legs of the cross-sectional profile each have a length/width ratio of at least 2:1 and the individual titre is 0.5 to 5 dtex.

2. The absorptive sound insulation according to claim 1, wherein the absorption/stiffening nonwovens contain 5 to 95% by weight of the rayon.

3. The absorptive sound insulation according to claim 1, wherein the absorption/stiffening nonwovens consist of rayon.

4. The absorptive sound insulation according to claim 1, comprising a 3D sound insulation geometry manufactured by the fibre flocking process.

5. The absorptive sound insulation according to claim 1, wherein the wear layer comprises (a1) a tufted carpet, (a2) a velour and flat needlepunched nonwoven carpet, and (a3) a microperforated film, or (a4) a PET or blended fibre nonwoven.

6. The absorptive sound insulation according to claim 1, comprising an interior bulkhead, a floor paneling, thermal insulation, a roof lining, a parcel shelf, a luggage compartment side paneling, an interior wheel arch cover, a spare wheel well, a luggage compartment lid and a load floor.

7. The absorptive sound insulation according to claim 2, wherein the absorption/stiffening nonwovens contain 15 to 70% by weight of the rayon.

8. The absorptive sound insulation according to claim 5, wherein a tufted carpet is formed of a yarn material selected from the group consisting of PA66, PA6, PP, rPA, PET, and rPET.

9. The absorptive sound insulation according to claim 5, wherein the tufted carpet as formed of a bio-based polyamide selected from the group consisting of PA 5.10 and PA 610.

10. The absorptive sound insulation according to claim 5, wherein the tufted carpet comprises a velour and flat needlepunched nonwoven carpet formed of a fibre material selected from the group consisting of PET, PET/PP, PP, PA/PET and rPET.

Description

EXAMPLE OF EXECUTION

Example 1

[0046] To demonstrate the acoustic effectiveness, a 400 g/m.sup.2 and a 600 g/m.sup.2 needle fleece of commercially available rayon [GALAXY VY Faser of Kelheim Fibres GmbH] were produced in each case from solid individual phases with a multi-leg cross-sectional shape, wherein at least three legs are present, in which the legs of the cross-sectional profile each have a length/width ratio of at least 2 to 1 and the individual titre is 0.5 to 5 dtex, in a manner known per se.

Example 2

[0047] Furthermore, a 400 g/m.sup.2 (VEGRO 400) and a 600 g/m.sup.2 (VEGRO 600) needled nonwoven in each case of 30 wt. % PET (12 dtex/length 64 mm), 30 wt. % PET (11 dtex/length 60 mm) and 40 wt.-% PET (6.7 dtex/length 64 mm) are produced.

[0048] The absorption measurements, carried out in a standard alpha booth, are shown in FIG. 1.

[0049] FIG. 2 shows the results of measurements in the impedance tube, pressed/unpressed.

[0050] Figs. clearly show the absorptive efficiency of the sound insulation according to the invention.

Example 3

[0051] In application for floor and luggage compartment panelings, the 600 g/m.sup.2 rayon needle punched nonwovens and the PET needle punched nonwovens according to examples 1 and 2 were laminated with a tufted carpet (600 g/m.sup.2 PA), a velour carpet (560 g/m.sup.2 PET) and a flat needle punched nonwoven (300 g/m.sup.2) respectively and measured in the impedance tube. The significantly better absorptive efficiency of the composites with rayon needled nonwovens according to the invention compared to the PET needled nonwoven can be seen in FIGS. 3 to 5.