Lightweight acoustical system

• US 6,296,075 B1
• Filed: 06/02/2000
• Issued: 10/02/2001
• Est. Priority Date: 06/02/2000
• Status: Expired due to Term

• Current Assignee: Lear Corporation
• Original Assignee: Lear Corporation
• Inventors: Wyerman, Barry, Gish, Laura E., Huang, Liangyu, Boyles, David, Ebbitt, Gordon
• Primary Examiner(s): Dang, Khanh
• Application Number:
  US09/586,504
• Time in Patent Office: 487 Days
• Field of Search: 181/284, 181/286, 181/290, 181/291, 181/294, 181/295
• US Class Current: 181/290
• CPC Class Codes: B32B 2307/10 having particular acoustical properties
• CPC Class Codes: B32B 2307/7265 Non-permeable
• CPC Class Codes: B32B 2323/04 Polyethylene
• CPC Class Codes: B32B 2471/02 Carpets
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 5/26 another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: B60R 13/083 for fire walls or floors
• CPC Class Codes: B60R 13/0892 for humidity insulation sealing strips B60R13/06
• CPC Class Codes: G10K 11/162 Selection of materials
• CPC Class Codes: G10K 11/168 Plural layers of different materials, e.g. sandwiches

Abstract

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.

Claims

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 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.