A two-component sound-absorbing cotton

Abstract

This utility model discloses a two-component sound-absorbing cotton, including an inner sound-absorbing layer and an outer sound-absorbing layer, with an intermediate layer between the inner and outer sound-absorbing layers. The intermediate layer is bonded to both the inner and outer sound-absorbing layers by an adhesive layer. The outer sound-absorbing layer has a first sound-absorbing groove, which is wavy and has a through-groove at its trough that penetrates the outer side of the outer sound-absorbing layer. When sound waves pass through the outer sound-absorbing layer and enter the first sound-absorbing groove through the through-groove, the sound waves will collide with the inner wall of the first sound-absorbing groove to reduce noise. Since the sound waves enter from the through-groove and collide with the inner wall of the first sound-absorbing groove and are transmitted to both sides along the path of the first sound-absorbing groove, a portion of the sound waves will exit from the adjacent through-groove, thus achieving the effect of reducing noise.

Description

Technical Field

[0001] This utility model relates to the field of sound-absorbing cotton technology, specifically a two-component sound-absorbing cotton. Background Technology

[0002] Sound-absorbing cotton is a material with excellent sound absorption properties. As a lining material, it is widely used in industries such as construction, electrical appliances, automobiles, and machinery, primarily for sound insulation. However, existing sound-absorbing cotton products suffer from problems such as mediocre sound absorption and insufficient structural strength. Utility Model Content

[0003] Based on the above-mentioned problems existing in the prior art, the purpose of this utility model embodiment is to provide a two-component sound-absorbing cotton.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a two-component sound-absorbing cotton, including an inner sound-absorbing layer and an outer sound-absorbing layer, with an intermediate layer provided between the inner sound-absorbing layer and the outer sound-absorbing layer, the intermediate layer being bonded to the inner sound-absorbing layer and the outer sound-absorbing layer respectively by an adhesive layer, and a first sound-absorbing groove being provided in the outer sound-absorbing layer, the first sound-absorbing groove being wavy and having a through groove penetrating the outer side of the outer sound-absorbing layer at its trough.

[0005] Furthermore, the outer sound-absorbing layer is also provided with a second sound-absorbing groove. The second sound-absorbing groove has the same shape as the first sound-absorbing groove and is located on the inner side of the outer sound-absorbing layer. The trough of the second sound-absorbing groove corresponds to the crest of the first sound-absorbing groove and is connected by a connecting groove.

[0006] Furthermore, the inner and outer sound-absorbing layers are coated with a sound-absorbing coating on their sides away from the intermediate layer, and the sound-absorbing coating is made of acrylic resin or polyurethane.

[0007] Furthermore, the intermediate layer is filled with composite filler particles.

[0008] Furthermore, the intermediate layer is made of polypropylene, and the outer and inner sound-absorbing layers are made of PET.

[0009] Furthermore, the intermediate layer is provided with several sound-absorbing holes.

[0010] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0011] The inner and outer sound-absorbing layers are densely packed, serving to block and reflect sound waves. When sound waves pass through the outer sound-absorbing layer and enter the middle layer, some of the sound waves collide and reflect within the inner wall of the sound-absorbing groove, while the other part passes through the middle layer and reaches the inner sound-absorbing layer. The inner sound-absorbing layer has a porous structure that can absorb some sound waves. When the sound waves reach the inner sound-absorbing layer, some of them collide and reflect back to the middle layer, where they are consumed again, thus improving noise reduction performance. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] In the picture:

[0014] Figure 1 This is a cross-sectional view of the present invention;

[0015] In the picture:

[0016] 1. Inner sound-absorbing layer; 2. Outer sound-absorbing layer; 3. Intermediate layer; 4. First sound-absorbing groove; 5. Through groove; 6. Second sound-absorbing groove; 7. Sound-absorbing coating; 8. Sound-absorbing hole. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0018] Please see Figure 1 The present invention provides a technical solution: a two-component sound-absorbing cotton, comprising an inner sound-absorbing layer 1 and an outer sound-absorbing layer 2, wherein an intermediate layer 3 is provided between the inner sound-absorbing layer 1 and the outer sound-absorbing layer 2, and the intermediate layer 3 is bonded to the inner sound-absorbing layer 1 and the outer sound-absorbing layer 2 respectively by an adhesive layer; a first sound-absorbing groove 4 is provided in the outer sound-absorbing layer 2, the first sound-absorbing groove 4 is wavy and a through groove 5 penetrating the outer side of the outer sound-absorbing layer 2 is provided at its trough;

[0019] When the sound wave passes through the outer sound-absorbing layer 2 and enters the first sound-absorbing groove 4 through the through groove 5, the sound wave will collide with the inner wall of the first sound-absorbing groove 4 to reduce noise. As the sound wave enters from the through groove 5 and collides with the inner wall of the first sound-absorbing groove 4 and is transmitted to both sides along the path of the first sound-absorbing groove 4, a part of the sound wave will pass out from the adjacent through groove 5, thus achieving the effect of reducing noise.

[0020] The outer sound-absorbing layer 2 is also provided with a second sound-absorbing groove 6. The second sound-absorbing groove 6 has the same shape as the first sound-absorbing groove 4 and is located inside the outer sound-absorbing layer 2. The trough of the second sound-absorbing groove 6 corresponds to the crest of the first sound-absorbing groove 4 and is connected by a connecting groove. The path of the sound-absorbing groove is extended by the second sound-absorbing groove 6 to enhance the sound-absorbing effect.

[0021] The inner sound-absorbing layer 1 and the outer sound-absorbing layer 2 are coated with a sound-absorbing coating 7 on their sides away from the intermediate layer 3. The sound-absorbing coating 7 is made of acrylic resin or polyurethane. The hardness of acrylic resin is adjustable, and the acoustic impedance of the sound-absorbing cotton and air can be matched by adjusting the formula to reduce the reflection of sound waves at the interface. Polyurethane has strong suppression performance for high-frequency noise and is suitable for use in engine compartments.

[0022] The middle layer 3 is filled with composite filler particles, which can be glass microspheres, ceramic particles or aerogel particles, etc., and have a porous structure and excellent sound absorption performance.

[0023] The middle layer 3 is made of polypropylene and PET. During the process of spraying molten polypropylene using a meltblown device, broken PET short fibers are added. It has hydrophobic and moisture-proof effects, high porosity, and good sound absorption. The addition of PET short fibers can increase the content of solid particles in the meltblown system, and enhance the mechanical entanglement between fibers through physical interpenetration, thereby improving the tensile strength and tear resistance of the fiber web. The outer sound-absorbing layer 2 and the inner sound-absorbing layer 1 are made of HDPE material. Its molecular chains are tightly arranged and have a high density, which can reflect sound waves. Its texture is hard and its structural support is good, which plays a supporting and protective role for the overall sound-absorbing cotton.

[0024] The intermediate layer 3 is provided with a number of sound-absorbing holes 8. By opening the sound-absorbing holes 8, the sound-absorbing effect can be improved while the weight of the entire sound-absorbing cotton can be reduced.

[0025] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A two-component sound-absorbing cotton, characterized in that: It includes an inner sound-absorbing layer and an outer sound-absorbing layer, with an intermediate layer between the inner and outer sound-absorbing layers. The intermediate layer is bonded to the inner and outer sound-absorbing layers respectively by an adhesive layer. The outer sound-absorbing layer has a first sound-absorbing groove, which is wavy and has a through groove at its trough that penetrates the outer side of the outer sound-absorbing layer.

2. The two-component sound-absorbing cotton according to claim 1, characterized in that: The outer sound-absorbing layer is also provided with a second sound-absorbing groove. The second sound-absorbing groove has the same shape as the first sound-absorbing groove and is located on the inner side of the outer sound-absorbing layer. The trough of the second sound-absorbing groove corresponds to the crest of the first sound-absorbing groove and is connected by a connecting groove.

3. The two-component sound-absorbing cotton according to claim 1, characterized in that: The inner and outer sound-absorbing layers are coated with a sound-absorbing coating on their sides away from the middle layer. The sound-absorbing coating is made of acrylic resin or polyurethane.

4. The two-component sound-absorbing cotton according to claim 1, characterized in that: The intermediate layer is filled with composite filler particles.

5. The two-component sound-absorbing cotton according to claim 1, characterized in that: The intermediate layer is made of polypropylene, and the outer and inner sound-absorbing layers are made of PET.

6. The two-component sound-absorbing cotton according to claim 1, characterized in that: The intermediate layer has several sound-absorbing holes.

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