Lightweight acoustical system
View Patent ↗An improved acoustical system for inhibiting noise in a motor vehicle. The system comprises an impermeable layer and an underlayment adjacent to the impermeable layer. The underlayment includes a first fibrous layer and a second fibrous layer. The underlayment has an airflow resistance between about 2000 and about 5000 mks Rayls.
1. An acoustical system comprising:
a water-impermeable layer;
an underlayment adjacent to the impermeable layer, the underlayment including a first fibrous layer and a second fibrous layer, the first fibrous layer having a density less than a density of the second fibrous layer;
the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls; and
a semi-permeable layer disposed between the first and second fibrous layers.
2. The acoustical system of claim 1 wherein the semi-permeable layer comprises a film.
3. The acoustical system of claim 1 wherein the first fibrous layer has a surface density between about 500 grams per square meter and about 1400 grams per square meter.
4. The acoustical system of claim 1 wherein the second fibrous layer has a surface density between about 500 grams per square meter and about 1400 grams per square meter.
5. The acoustical system of claim 1 wherein the second fibrous layer is adjacent to the impermeable layer.
6. The acoustical system of claim 1 wherein the second fibrous layer is a composite.
7. The acoustical system of claim 1 wherein the underlayment is situated between the impermeable layer and a noise source.
8. The acoustical system of claim 1 further comprising a decorative layer situated adjacent to the impermeable layer.
9. A carpet with noise-inhibiting characteristics for use in a motor vehicle, the carpet comprising:
a water-impermeable layer; and
an underlayment adjacent to the impermeable layer, the underlayment including a first fibrous layer and a second fibrous layer, the first fibrous layer having a density less than a density of the second fibrous layer;
the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls;
wherein the first and second fibrous layers have a surface density between about 500 grams per square meter and about 1400 grams per square meter.
10. The carpet of claim 9 further comprising a semi-permeable layer disposed between the first and second fibrous layers.
11. The carpet of claim 10 wherein the semi-permeable layer comprises a film.
12. The carpet of claim 9 wherein the second fibrous layer is adjacent to the impermeable layer.
13. The carpet of claim 9 wherein the second fibrous layer is a composite.
14. The carpet of claim 9 wherein the underlayment is situated between the impermeable layer and a noise source.
15. The carpet of claim 9 wherein the first layer is situated between the second layer and a noise source.
16. A system for inhibiting noise in a motor vehicle, the system comprising:
an impermeable layer; and
an underlayment adjacent to the impermeable layer, the underlayment including a first fibrous layer, a second fibrous layer, and a semi-permeable layer, the first layer having a surface density between about 500 grams per square meter and about 1400 grains grams per square meter, and the second layer having a surface density between about 500 grams per square meter and about 1400 grams per square meter;
the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls.
17. An acoustical system comprising:
a water - impermeable layer;
an underlayment adjacent to the impermeable layer, the underlayment including a first layer and a second layer, the first layer having a density less than a density of the second layer, and a semi - permeable layer disposed between the first and second layers; and
the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls.
18. The acoustical system of claim 17 wherein the semi- permeable layer comprises a film.
19. The acoustical system of claim 17 wherein the first layer has a surface density between about 500 grams per square meter and about 1400 grams per square meter.
20. The acoustical system of claim 17 wherein the second layer has a surface density between about 500 grams per square meter and about 1400 grams per square meter.
21. The acoustical system of claim 17 wherein the second layer is adjacent to the impermeable layer.
22. The acoustical system of claim 17 wherein the second layer is a composite.
23. The acoustical system of claim 17 wherein the underlayment is situated between the impermeable layer and a noise source.
24. The acoustical system of claim 17 further comprising a decorative layer situated adjacent to the impermeable layer.
25. A carpet with noise- inhibiting characteristics for use in a motor vehicle, the carpet comprising:
a water - impermeable layer; and
an underlayment adjacent to the impermeable layer, the underlayment including a first layer and a second layer, the first layer having a density less than a density of the second layer;
the underlayment having a specific air flow resistance between about 2000 and 5000 mks Rayls;
wherein the first and second layers have a surface density between about 500 grams per square meter and about 1400 grams per square meter.
26. The carpet of claim 25 further comprising a semi- permeable layer disposed between the first and second layers.
27. The carpet of claim 26 wherein the semi- permeable layer comprises a film.
28. The carpet of claim 25 wherein the second layer is adjacent to the impermeable layer.
29. The carpet of claim 25 wherein the second layer is a composite.
30. The carpet of claim 25 wherein the underlayment is situated between the impermeable layer and a noise source.
31. The carpet of claim 25 wherein the first layer is situated between the second layer and a noise source.
32. A system for inhibiting noise in a motor vehicle, the system comprising:
an impermeable layer; and
an underlayment adjacent to the impermeable layer, the underlayment including a first layer, a second layer, and a semi - permeable layer, the first layer having a surface density between about 500 grams per square meter and about 1400 grams per square meter, and the second layer having a surface density between about 500 grams per square meter and about 1400 grams per square meter;
the underlayment having a specific airflow resistance between about 2000 and about 5000 mks Rayls.