Foam material sound absorption

• US 4,584,232 A
• Filed: 09/13/1984
• Issued: 04/22/1986
• Est. Priority Date: 01/20/1983
• Status: Expired due to Fees

• Current Assignee: Illbruck GmbH Schaumstofftechnik Bruscheider Strasse
• Original Assignee: Illbruck GmbH Schaumstofftechnik
• Inventors: Frank, Werner, Irregeher, Josef F.
• Primary Examiner(s): VAN BALEN, WILLIAM
• Application Number:
  US06/654,020
• Time in Patent Office: 586 Days
• Field of Search: 180/90, 181/286, 181/288, 181/291, 181/294, 181/DIG. 1, 264/321, 296/70, 428/137, 428/139, 428/140, 428/156, 428/158-160, 428/304.4, 428/309.9, 428/316.6, 428/318.6, 428/170, 428/174, 428/247, 428/255, 428/256, 428/317.1 , 428/317.3, 428/317.5, 428/317.7, 428/317.9
• US Class Current: 442/30
• CPC Class Codes: B32B 2307/102 Insulating
• CPC Class Codes: B32B 2307/724 Permeability to gases, adsorption
• CPC Class Codes: B32B 2605/08 Cars
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 5/32 at least two layers being foamed and next to each other
• CPC Class Codes: B60R 13/0838 for engine compartments
• CPC Class Codes: G10K 11/168 Plural layers of different materials, e.g. sandwiches
• CPC Class Codes: Y10T 428/24504 Component comprises a polymer [e.g., rubber, etc.]
• CPC Class Codes: Y10T 428/24595 and varying density
• CPC Class Codes: Y10T 428/24628 Nonplanar uniform thickness material
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]
• CPC Class Codes: Y10T 428/24996 With internal element bridging layers, nonplanar interface between layers, or intermediate layer of commingled adjacent foam layers
• CPC Class Codes: Y10T 428/249981 Plural void-containing components
• CPC Class Codes: Y10T 428/249982 With component specified as adhesive or bonding agent
• CPC Class Codes: Y10T 428/249988 Of about the same composition as, and adjacent to, the void-containing component
• CPC Class Codes: Y10T 442/15 Including a foam layer
• CPC Class Codes: Y10T 442/25 Coating or impregnation absorbs sound

Abstract

The present invention relates to a sound absorbing member comprising a fiber grid insert disposed between and bonded to two open cell foam panels.

Claims

1. A sound absorbing member comprising

a first open cell foam panel,

a second open cell foam panel,

a fiber grid insert disposed between said panels,

a bonding substance which bonds said grid fibers together and bonds said first and second panels to said grid insert,

said panels being compacted under heat and pressure to provide an acoustical impedance of from 20 to 120 rayls.

2. The said absorbing member of claim 1 in which said acoustical impedance is 80 rayls.

3. The said absorbing member of claim 1 in which said sound absorbing member is of a non-planar configuration and said panels and said grid are formed into said non-planar configuration during compaction under heat and pressure.

4. The sound absorbing member of claim 3 in which said compaction under heat and pressure takes place only by zones.

5. The said sound absorbing member of claim 1 in which a skin is formed on the outer surface of one of said panels to provide the acoustical impedance of from 20 to 120 rayls.

6. The sound absorbing member of claim 1 in which a portion of the outer surface of the first panel is spaced from the plane of the marginal surface of said panel by a multiple of the panel thickness, and said marginal portion of said panel forms a bearing edge.