SOUND ABSORBING PANEL

• US 3,858,676 A
• Filed: 10/05/1973
• Issued: 01/07/1975
• Est. Priority Date: 01/22/1973
• Status: Expired due to Term

• Current Assignee: Georgia-Pacific Corporation
• Original Assignee: Philip H. Le Masurier
• Inventors: Le Masurier, Philip H.
• Primary Examiner(s): Wilkinson, Richard B.
• Assistant Examiner(s): Gonzales, John F.
• Application Number:
  US05/403,968
• Time in Patent Office: 459 Days
• Field of Search: 181/33G,33GB
• US Class Current: 181/286
• CPC Class Codes: B32B 17/02 in the form of fibres or filaments
• CPC Class Codes: B32B 2262/101 Glass fibres
• CPC Class Codes: B32B 2315/085 Glass fiber cloth or fabric
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: E04B 1/8227 screens E04B2/74 takes precedence; for road or railway traffic E01F; Arrangements of sound-absorbing elements, e.g. baffles
• CPC Class Codes: E04B 2/7409 special measures for sound or thermal insulation, including fire protection
• CPC Class Codes: E04B 2/7422 with separate framed panels without intermediary support posts
• CPC Class Codes: E04B 2001/8433 with holes in their face
• CPC Class Codes: E04B 2001/8452 with peripheral frame members

Abstract

A thin sound-absorbing panel especially suitable for interior wall surfaces exhibits enhanced broad band sound absorption and especially for low frequency sounds. By low frequency is meant those below 500 Hertz (cycles per second), preferably as measured at 125 and 250 Hertz. The preferred construction involves a three layer panel having a perforated backing, a heavy textile front having a surface mass of 12-24 ounces per 1 square yard and an SFR of 300 to 1,800 MKS rayls and a fiberglass core.

Claims

1. A thin sound-absorbing panel for use on walls or as a partition or the like comprising a rigid frame a perforated backing selecting from the group consisting of hardboard or perforated metal attached to and covering one side of said frame;

a heavy textile having a SFR of from 300 to 1,800 MKS rayls attached to and covering the other side of said frame;

fiberglass substantially filling the space between said textile and said backing;

said panel having a thickness in the range from about 1 inch to about 2 inches and a sound absorption coefficient as determined by ASTM C 423-66 of at least about 0.90 at at least three of the 1/3 active test frequency bands between and including 250 Hz and 4 Kilohertz.

2. A thin Sound-absorbing panel according to claim 1 wherein said backing is made of perforated metal lathing.

3. A thin sound-absorbing panel according to claim 1 wherein said heavy textile is selected from the group consisting of cotton, jute, a mixture of cotton and jute, and nonwoven monoacrylic fiber attached to and covering the other side of said frame, said textile having a surface mass of not less than 12 but more than 24 oz./square yard.

4. A thin sound-absorbing panel according to claim 1 wherein said panel thickness is in the range from about 1 1/4 inches to 1 3/4 inches.

5. A thin sound-absorbing panel according to claim 1 wherein said backing is made of perforated hardboard.

6. A panel according to claim 2 wherein said sound absorption coefficient at 250 Hz is at least about 0.97.

7. A panel according to claim 6 with a thickness in the range from about 1 inch to about 1 3/4 inches which has a sound absorption coefficient at 250 Hertz of at least 0.95 and a sound absorption coefficient at 4,000 Hz of 0.90.

8. A thin sound-absorbing free-standing panel for use on walls or as a partition of the like comprising a free-standing frame;

a perforated backing attached to and covering one side of said frame;

a heavy textile selected from the group consisting of cotton, jute, a mixture of same, and non-woven monoacrylic attached to and covering the other side of said frame and having a specific flow resistance of from 300 to 1,800 MKS rayls;

fiberglass substantially filling the space between said textile and said backing;

said panel having a thickness in the range from about 1 to 2 inches and an absorbency coefficient of at least 0.97 determined by ASTM C 423-66 at 250 Hertz.

9. A thin, sound-absorbing panel as defined in claim 8 wherein the surface mass of the material is at least 12 oz./square yard.