Acoustical insulating barrier and method of making the barrier

• US 6,109,389 A
• Filed: 05/11/1999
• Issued: 08/29/2000
• Est. Priority Date: 05/11/1999
• Status: Expired due to Term

• Current Assignee: Lydall Incorporated
• Original Assignee: Lydall Incorporated
• Inventors: Fletcher, John K., Hiers, John J.
• Primary Examiner(s): Dang, Khanh
• Application Number:
  US09/309,574
• Time in Patent Office: 476 Days
• Field of Search: 181/290, 181/293, 181/286, 181/287, 181/294, 181/295, 428/95, 428/96, 428/97, 428/201, 428/215, 428/218, 428/219, 428/220
• US Class Current: 181/290
• CPC Class Codes: B60R 13/08 Insulating elements, e.g. for sound insulation sound insulating linings for trains B61D17/185; drivers' cabs for load-carrying vehicles insulated against vibrations or noise B62D33/0604; thermal or acoustic insulation of engines F02B77/11; damping of sounds using compensation by electro-acoustic methods G10K11/178
• CPC Class Codes: B60R 13/083 for fire walls or floors
• CPC Class Codes: G10K 11/168 Plural layers of different materials, e.g. sandwiches
• CPC Class Codes: Y10T 428/23979 Particular backing structure or composition

Abstract

A needled composite acoustical barrier is provided. The barrier has a non-woven first layer (13) of needleable textile first fibers (13a); the layer (13) has a thickness of between about 0.01 inch and 0.5 inch and a density of between about 1.0 and 10 lbs. per cubic foot. A non-woven, low density second layer (15) of textile second fibers (15a) is provided; the second layer (15) has a thickness of between about 0.2 inch and 5 inches and a density of between about 0.1 and 4.0 lbs. per cubic foot. A high-density intermediate acoustical barrier layer (14) is disposed between the first and second layers (13, 15); the intermediate barrier layer (14) has a thickness of between about 0.01 inch and 0.5 inch, a density of at least 50 lbs. per cubic foot, and the barrier layer has a substantially continuous film of high-density needleable polymeric material. A plurality of needled stitches (19), formed from the first fibers (13a), extend from the first layer (13), through the intermediate barrier layer (14) and at least into the second layer (15).

Claims

1. A needled composite acoustical barrier, comprising:

(1) a non-woven first layer (13) of needleable textile first fibers (13a), said first layer (13) having a thickness of between about 0.01 inch and 0.5 inch and a density of between about 1.0 and 10 lbs. per cubic foot;

(2) a non-woven, low density second layer (15) of textile second fibers (15a), said second layer (15) having a thickness of between about 0.2 inch and 5 inches and a density of between about 0.1 and 4.0 lbs. per cubic foot;

(3) a high-density intermediate acoustical barrier layer (14) disposed between the first and second layers (13,

     15), said intermediate barrier layer (14) having a thickness of between about 0.01 inch and 0.5 inch, a density of at least about 50 lbs. per cubic foot, and said barrier layer comprising a substantially continuous film of high-density needleable polymeric material; and

(4) a plurality of needled stitches (19) formed from the first fibers (13a) and extending from the first layer (13), through the intermediate barrier layer (14) and at least into the second layer (15).

2. The composite of claim 1, wherein the first fibers (13a) are carded fibers or a needleable web of fibers.

3. The composite of claim 1, wherein the first fibers (13a) have deniers per filament of between about 1 and 35.

4. The composite of claim 1, wherein the first layer (13) includes a heat-fusible component (13b) which is heat fusible a temperature above about 180°

F. and is contained in the first layer (13) in amounts of between 10% and 70% by weight of the first layer (13).

5. The composite of claim 1, wherein the first fibers (13a) are one or more of polyester, polyolefin, cellulosic, polyamide, nylon, polyvinyl chloride, polyacrylic, aramid, imide and melamine fibers.

6. The composite of claim 4, wherein the heat-fusible component is in a heat-fusible fiber form.

7. The composite of claim 6, wherein the heat-fusible fiber form is a bicomponent fiber or a sheath/core fiber.

8. The composite of claim 1, wherein the first layer (13) has a thickness of between about 0.05 inch and 0.1 inch.

9. The composite of claim 8, wherein the first layer (13) has a density of between about 3 and 5 lbs. per cubic foot.

10. The composite of claim 1, wherein the second layer (15) is in the form of carded fibers or a needleable web of fibers.

11. The composite of claim 1, wherein the second fibers (15a) have a denier of about 5 and 70.

12. The composite of claim 1, wherein the second layer (15) includes a heat-fusible component (15b) which is heat fusible at temperatures above about 180°

F. and is contained in the second layer (15) in amounts between about 5% and 40% by weight of the second layer.

13. The composite of claim 1, wherein the second fibers (15a) are one or more of polyester, nylon, polyolefin, cellulosic, polyamide, polyacrylic, polyvinyl chloride, aramid, imide and melamine fibers.

14. The composite of claim 12, wherein the heat-fusible component is in a heat-fusible fiber form.

15. The composite of claim 14, wherein the heat-fusible fiber form is a bicomponent fiber or a sheath/core fiber.

16. The composite of claim 15, wherein the heat-fusible fiber is a sheath/core fiber.

17. The composite of claim 1, wherein the thickness of the second layer (15) is between about 0.5 inch and 3 inches and the density is between about 1.0 and 2.0 lbs. per cubic foot.

18. The composite of claim 1, wherein the intermediate barrier layer (14) has a thickness of between about 0.01 inch and 0.15 inch and a density of between about 100 and 150 lbs. per cubic foot.

19. The composite of claim 1, wherein the polymeric material of the intermediate barrier layer (14) is one or more of rubber, synthetic rubber, polyvinyl chloride, polyvinyl acetate, polyurethane, silicone rubber and polyethylenevinyl acetate and a polymer of ethylenepropylene dimer monomer.

20. The composite of claim 1, wherein the intermediate barrier layer (14) has therein a solid particulate filler (23) having a density greater than 1 gram per cubic centimeter.

21. The composite of claim 20, wherein the filler (23) is an inorganic filler.

22. The composite of claim 21, wherein the inorganic filler (23) is a clay, metal or metal compound.

23. The composite of claim 1, wherein the intermediate barrier layer (14) has a density between about 100 and 150 lbs. per cubic foot.

24. The composite of claim 20, wherein the filler (23) is uniformly dispersed within the intermediate barrier layer (14).

25. The composite of claim 1, wherein the stitches (19) extend through the second layer (15).

26. The composite of claim 1, wherein there are from about 100 to up to about 600 stitches (19) per square inch of the composite.

27. The composite of claim 26, wherein there are about 150 to 500 stitches (19) per square inch of the composite.

28. The composite of claim 1, wherein the composite is bonded at a top surface (22) of the first layer (13) to an underside (12a) of a carpet or felt (12).

29. The composite of claim 28, wherein the carpet or felt (12) is an automotive carpet or felt.

30. The composite of claim 28, wherein the composite is fusion bonded to the carpet or felt (12).

31. The composite of claim 30, wherein the fusion bonding is by way of a heat-fusible component of the first layer (13).

32. A method of producing a composite acoustical barrier, comprising:

(1) assembling a composite of (i) a non-woven first layer (13) of needleable textile first fibers (13a), said first layer (13) having a thickness of between about 0.01 inch and 0.5 inch and a density of between about 1.0 and 10 lbs. per cubic foot, (ii) a non-woven, low density second layer (15) of textile second fibers (15a), said second layer (15) having a thickness of between about 0.2 inch and 5 inches and a density of between about 0.1 and 4.0 lbs. per cubic foot, and (iii) a high-density intermediate acoustical barrier layer (14) disposed between the first and second layers (13,

     15), said intermediate barrier layer (14) having a thickness of between about 0.01 inch and 0.5 inch, a density of at least 50 lbs. per cubic foot, and said barrier layer comprising a substantially continuous film of high-density needleable polymeric material; and

(2) needling the composite with about 100 to 600 stitches per square inch, such that stitches (19) formed from the first fibers (13a) extend from the first layer (13), through the intermediate barrier layer (14), and at least into the second layer (15).

33. The method of claim 32, wherein the first fibers (13a) are carded fibers or a needleable web of fibers.

34. The method of claim 32, wherein the first fibers (13a) have deniers per filament of between about 1 and 35.

35. The method of claim 32, wherein the first layer (13) includes a heat-fusible component (13b) which is heat fusible a temperature above about 180°

F. and is contained in the first layer (13) in amounts of between 10% and 70% by weight of the first layer.

36. The method of claim 32, wherein the first fibers (13a) are one or more of polyester, nylon, polyolefin, cellulosic, polyamide, nylon, polyacrylic, polyvinyl chloride, aramid, imide and melamine fibers.

37. The method of claim 35, wherein the heat-fusible component is in a heat-fusible fiber form.

38. The method of claim 37, wherein the heat-fusible fiber form is a bicomponent fiber or a sheath/core fiber.

39. The method of claim 32, wherein the first layer (13) has a thickness of between about 0.05 inch and 0.1 inch.

40. The method of claim 39, wherein the first layer (13) has a density of between about 3 and 5 lbs. per cubic foot.

41. The method of claim 32, wherein the second layer (15) is in the form of carded fibers or a needleable web of fibers.

42. The method of claim 32, wherein the second fibers (15a) have a denier per filament of about 5 and 70.

43. The method of claim 32, wherein the second layer (15) includes a heat-fusible component (15b) which is heat fusible at temperatures above about 180°

F. and is contained in the second layer (15) in amounts between about 5% and 40% by weight of the second layer.

44. The method of claim 32, wherein the second fibers (15a) are one or more of polyester, nylon, polyolefin, cellulosic, polyamide, polyacrylic, polyvinyl chloride, aramid, imide and melamine fibers.

45. The method of claim 43, wherein the heat-fusible component is in a heat-fusible fiber form.

46. The method of claim 45, wherein the heat-fusible fiber form is a bicomponent fiber or a sheath/core fiber.

47. The method of claim 46, wherein the heat-fusible fiber is a sheath/core fiber.

48. The method of claim 32, wherein the thickness of the second layer (15) is between about 0.5 inch and 3 inches and the density is between about 1.0 and 2.0 lbs. per cubic foot.

49. The method of claim 32, wherein the intermediate barrier layer (14) has a thickness of between about 0.01 inch and 0.5 inch and a density of between about 100 and 150 lbs. per cubic foot.

50. The method of claim 32, wherein the polymeric material of the intermediate barrier layer (14) is one or more of rubber, synthetic rubber, polyvinyl chloride, polyvinyl acetate, silicone rubber and polyethylenevinyl acetate.

51. The method of claim 32, wherein the intermediate barrier layer (14) has therein a solid particulate filler (23) having a density greater than 1 gram per cubic centimeter.

52. The method of claim 51, wherein the filler (23) is an inorganic filler.

53. The method of claim 52, wherein the inorganic filler (23) is a clay, metal or metal compound.

54. The method of claim 32, wherein the intermediate barrier layer (14) has a density between about 100 and 150 lbs. per cubic foot.

55. The method of claim 51, wherein the filler (23) is uniformly dispersed within the intermediate barrier layer (14).

56. The method of claim 32, wherein the stitches (19) extend through the second layer (15).

57. The method of claim 32, wherein there are from about 150 to up to about 500 stitches (19) per square inch of the composite.

58. The method of claim 57, wherein there are about 200 to 400 stitches (19) per square inch of the composite.

59. The method of claim 32, wherein the composite is bonded at a top surface (22) of the first layer (13) to an underside (12a) of a carpet or felt (12).

60. The method of claim 59, wherein the carpet or felt (12) is an automotive carpet or felt.

61. The method of claim 59, wherein the composite is fusion bonded to the carpet or felt (12).

62. The method of claim 61, wherein the fusion bonding is by way of a heat-fusible component (13b) of the first layer (13).