Sound attenuating material for use within vehicles and methods of making same
First Claim
1. A sound attenuating composite article, comprising:
- a first layer of material, wherein the first layer of material is selected from the group consisting of acoustic fiber batting and acoustic foam;
a second layer of thermoplastic material fused to a surface of the first layer of material; and
a third layer of thermoplastic material fused to a surface of the second layer of thermoplastic material;
wherein one or more selected portions of the composite article are compressed relative to adjacent portions so as to have an acoustic impedance that is greater than an acoustic impedance of portions adjacent the one or more selected portions.
14 Assignments
0 Petitions
Accused Products
Abstract
Sound attenuating composite articles and methods of making same are provided. Sound attenuating composite article include first, second and/or third and/or fourth layers of material. The first layer of material may be either an acoustic fiber batting and/or an acoustic foam material and may be an elastic or inelastic material. The second layer of material is a thermoplastic material that is fused to a surface of the first layer of material. The third layer of material is a thermoplastic material that is fused to a surface of the second layer of material. The fourth layer of material is a woven or non-woven mixture of fibers, such as scrim material, that is attached to a surface of the third layer of material. Selected portions of the sound attenuating composite article are heated and then compressed (referred to as “tuned”) so as to have an acoustic impedance that is greater than an acoustic impedance of adjacent portions.
127 Citations
36 Claims
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1. A sound attenuating composite article, comprising:
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a first layer of material, wherein the first layer of material is selected from the group consisting of acoustic fiber batting and acoustic foam;
a second layer of thermoplastic material fused to a surface of the first layer of material; and
a third layer of thermoplastic material fused to a surface of the second layer of thermoplastic material;
wherein one or more selected portions of the composite article are compressed relative to adjacent portions so as to have an acoustic impedance that is greater than an acoustic impedance of portions adjacent the one or more selected portions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A sound attenuating composite article, comprising:
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a first layer of material, wherein the first layer of material is selected from the group consisting of acoustic fiber batting and acoustic foam; and
a second layer of thermoplastic material fused to a surface of the first layer of material, wherein the second layer of material comprises a thermoplastic material;
wherein one or more selected portions of the composite article are compressed relative to adjacent portions so as to have an acoustic impedance that is greater than an acoustic impedance of portions adjacent the one or more selected portions. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of producing a sound attenuating composite article, comprising:
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providing a first layer of material, wherein the first layer of material is selected from the group consisting of acoustic fiber batting and acoustic foam;
extruding a second layer of thermoplastic material onto a surface of the first layer of material at a temperature of between about 350°
F. and about 450°
F. such that the second layer of material fuses to the first layer of material;
compressing the first and second layers of material to a combined thickness of between about four millimeters and thirty millimeters (4-30 mm);
extruding a third layer of thermoplastic material onto a surface of the second layer of thermoplastic material at a temperature of between about 300°
F. and about 450°
F. such that the third layer of material fuses to the second layer of material; and
compressing the first, second, and third layers of material to a combined thickness of between about 4 mm and about 25 mm. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of producing a sound attenuating composite article, comprising:
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providing a first layer of material, wherein the first layer of material is selected from the group consisting of acoustic fiber batting and acoustic foam;
extruding a second layer of thermoplastic material onto a surface of the first layer of material at a temperature of between about 350°
F. and about 450°
F. such that the second layer of material fuses to the first layer of material; and
compressing the first and second layers of material to a combined thickness of between about four millimeters and thirty millimeters (4-30 mm). - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification