A nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton

Abstract

This utility model discloses a nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton, belonging to the field of three-dimensional vertical cotton technology. It includes a high-density fiber layer and a low-density fiber layer, with the low-density fiber layer fixedly connected to the bottom surface of the high-density fiber layer. Protective layers are fixedly connected to the surfaces of both the high-density and low-density fiber layers. This utility model uses the combination of high-density and low-density fiber layers to process noise of different frequency bands, forming a wide-band sound absorption and sound insulation capability, covering high-frequency, mid-low-frequency, and vibration noise, and is suitable for complex noise environments. The low-density vertical cotton has a high porosity and loose structure, which, combined with spiral fiber bundles, enhances the internal fiber interweaving strength, mainly absorbing mid-low-frequency noise. At the same time, the spiral fiber bundles can reduce material compression deformation and improve structural stability. The auxiliary honeycomb layer serves as a transition structure between the high and low density layers. Its porous honeycomb design can guide sound waves to reflect and scatter multiple times between layers, prolonging the propagation path of sound waves in the material and increasing energy loss.

Description

Technical Field

[0001] This utility model relates to the field of three-dimensional vertical cotton technology, and in particular to a nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton. Background Technology

[0002] Three-dimensional vertical cotton, also known as 3D cotton, is characterized by its use of vertical web-forming technology to construct a three-dimensional fiber structure, forming an upright fiber web or honeycomb fiber web. It is significantly different from nonwoven materials with traditional parallel fiber web structures and is mainly used for noise control in fields such as construction, automobiles, electronic equipment, and aerospace.

[0003] However, in the existing technology, the existing three-dimensional vertical cotton has low porosity and a single pore size distribution. It can only dissipate high-frequency sound waves through surface friction, and has poor sound absorption effect on medium and low frequencies. In addition, the sound waves have a short propagation path inside the material and low energy dissipation efficiency. Utility Model Content

[0004] The purpose of this invention is to solve the problems of low porosity, single pore size distribution, high frequency sound wave dissipation only through surface friction, poor sound absorption effect on medium and low frequencies, short propagation path of sound waves inside the material, and low energy dissipation efficiency in the existing technology. Therefore, a non-woven sound-absorbing and sound-insulating three-dimensional vertical cotton is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a non-woven sound-absorbing and sound-insulating three-dimensional vertical cotton, comprising a high-density fiber layer and a low-density fiber layer, wherein the low-density fiber layer is fixedly connected to the bottom surface of the high-density fiber layer, and a protective layer is fixedly connected to the surface of both the high-density fiber layer and the low-density fiber layer; the low-density fiber layer comprises a honeycomb layer, a low-density vertical cotton body, and a spiral fiber bundle, wherein the spiral fiber bundle is embedded in the interior of the low-density vertical cotton body, and the honeycomb layer is fixedly connected to the top surface of the low-density vertical cotton body, and the top surface of the honeycomb layer is fixedly connected to the high-density fiber layer.

[0006] Preferably, a rubber-based damping sheet is fixedly connected to the bottom surface of the low-density upright cotton body, and an aluminum foil layer is fixedly connected to the bottom surface of the rubber-based damping sheet.

[0007] Preferably, the high-density fiber layer includes a flame-retardant layer, a microporous PET film, and a high-density vertical cotton body, with the flame-retardant layer fixedly connected to the top surface of the microporous PET film.

[0008] Preferably, the bottom surface of the microporous PET film is fixedly connected to the top surface of the high-density vertical cotton body.

[0009] Preferably, the bottom surface of the high-density vertical cotton body is fixedly connected to the top surface of the honeycomb layer.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] 1. In this utility model, the combination of high-density fiber layers and low-density fiber layers is used to process noise of different frequency bands, forming a wide-band sound absorption and insulation capability, covering high-frequency, mid-low-frequency and vibration noise, and is suitable for complex noise environments. The low-density upright cotton body has high porosity and loose structure, and is combined with spiral fiber bundles to enhance the internal fiber interweaving strength, mainly absorbing mid-low frequency noise. At the same time, the spiral fiber bundles can reduce material compression deformation and improve structural stability. The auxiliary honeycomb layer serves as a transition structure between high and low density layers. Its porous honeycomb design can guide sound waves to reflect and scatter multiple times between layers, prolonging the propagation path of sound waves in the material and increasing energy loss.

[0012] 2. In this utility model, the high-density upright cotton main body has a compact structure and low porosity, which is mainly used to absorb high-frequency noise. The microporous PET film can further refine the air circulation path and enhance the friction loss of high-frequency sound waves. The flame-retardant layer improves the fire safety of this utility model. Attached Figure Description

[0013] Figure 1 This utility model presents a structural schematic diagram of a nonwoven sound-absorbing and sound-insulating three-dimensional upright cotton.

[0014] Figure 2 This utility model presents a structural schematic diagram of a nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton high-density fiber layer;

[0015] Figure 3 This utility model presents a structural schematic diagram of a nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton low-density fiber layer.

[0016] Legend: 1. High-density fiber layer; 11. Flame retardant layer; 12. Microporous PET film; 13. High-density upright cotton body; 2. Low-density fiber layer; 21. Honeycomb layer; 22. Low-density upright cotton body; 23. Spiral fiber bundle; 24. Rubber-based damping sheet; 25. Aluminum foil layer; 3. Protective layer. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Example: Figure 1 - Figure 3As shown, this utility model provides a non-woven sound-absorbing and sound-insulating three-dimensional vertical cotton, including a high-density fiber layer 1 and a low-density fiber layer 2. The low-density fiber layer 2 is fixedly connected to the bottom surface of the high-density fiber layer 1. Protective layers 3 are fixedly connected to the surfaces of both the high-density fiber layer 1 and the low-density fiber layer 2. The low-density fiber layer 2 includes a honeycomb layer 21, a low-density vertical cotton body 22, and a spiral fiber bundle 23. The honeycomb layer 21 is made of PP / PLA biodegradable resin. The fiber density of the low-density vertical cotton body 22 is 100-200 g / m², the vertical fiber ratio is 50%-60%, the fiber diameter is 15-25 μm, and the porosity is 80%-85%. The spiral fiber bundle 23 is formed by spirally twisting PET filaments at a twist rate of 5-10 twists / cm to form a spiral structure with a diameter of 0.5-1 mm, which is randomly distributed. The spiral fiber bundle 23 is embedded inside the low-density vertical cotton body 22. The honeycomb layer 21 is fixedly connected to the bottom surface of the low-density vertical cotton body 22. On the top surface, the top surface of the honeycomb layer 21 is fixedly connected to the high-density fiber layer 1. A rubber-based damping sheet 24 is fixedly connected to the bottom surface of the low-density vertical cotton body 22. An aluminum foil layer 25 is fixedly connected to the bottom surface of the rubber-based damping sheet 24. The high-density fiber layer 1 includes a flame-retardant layer 11, a microporous PET film 12, and a high-density vertical cotton body 13. The fiber density of the high-density vertical cotton body 13 is 300-500 g / m², and the vertical fiber ratio is ≥70%. It forms a tight three-dimensional network through thermal bonding or needle punching process. The fiber diameter is 8-15 μm. The flame-retardant layer 11 is made of flame-retardant treated PET / PP short fibers or aramid fiber needle-punched felt with a thickness of 0.3-0.5 mm. The surface is coated with a nano-level fireproof coating. The flame-retardant layer 11 is fixedly connected to the top surface of the microporous PET film 12. The bottom surface of the microporous PET film 12 is fixedly connected to the top surface of the high-density vertical cotton body 13. The bottom surface of the high-density vertical cotton body 13 is fixedly connected to the top surface of the honeycomb layer 21.

[0020] The specific settings and functions of this embodiment are described in detail below. Through the combined use of high-density fiber layer 1 and low-density fiber layer 2, the high and low density layers work together to process noise in different frequency bands, forming a wide-band sound absorption and insulation capability that covers high-frequency, mid-low-frequency, and vibration noise, making it suitable for complex noise environments. The low-density upright cotton body 22 has high porosity and a loose structure, which, combined with the spiral fiber bundles 23, enhances the internal fiber interweaving strength, mainly absorbing mid-low frequency noise. At the same time, the spiral fiber bundles can reduce material compression deformation and improve structural stability. The honeycomb layer 21 serves as a transition structure between the high and low density layers. Its porous honeycomb design can guide sound waves to reflect and scatter multiple times between layers, prolonging the propagation path of sound waves in the material and increasing energy loss. The rubber-based damping sheet 24 absorbs vibration energy through viscoelastic properties, reducing structural sound transmission. The aluminum foil layer 25 reflects high-frequency sound waves and blocks external moisture, while improving the rigidity of the material. The high-density vertical cotton body 13 has a compact structure and low porosity, mainly for absorbing high-frequency noise. The microporous PET film 12 can further refine the air circulation path and enhance the friction loss of high-frequency sound waves. The flame-retardant layer 11 improves the fire safety of the material.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton, characterized in that: It includes a high-density fiber layer (1) and a low-density fiber layer (2). The low-density fiber layer (2) is fixedly connected to the bottom surface of the high-density fiber layer (1). The surfaces of both the high-density fiber layer (1) and the low-density fiber layer (2) are fixedly connected to a protective layer (3). The low-density fiber layer (2) includes a honeycomb layer (21), a low-density upright cotton body (22), and a spiral fiber bundle (23). The spiral fiber bundle (23) is embedded in the interior of the low-density upright cotton body (22). The honeycomb layer (21) is fixedly connected to the top surface of the low-density upright cotton body (22). The top surface of the honeycomb layer (21) is fixedly connected to the high-density fiber layer (1).

2. The nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton according to claim 1, characterized in that: A rubber-based damping sheet (24) is fixedly connected to the bottom surface of the low-density upright cotton body (22), and an aluminum foil layer (25) is fixedly connected to the bottom surface of the rubber-based damping sheet (24).

3. The nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton according to claim 1, characterized in that: The high-density fiber layer (1) includes a flame-retardant layer (11), a microporous PET film (12), and a high-density vertical cotton body (13). The flame-retardant layer (11) is fixedly connected to the top surface of the microporous PET film (12).

4. The nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton according to claim 3, characterized in that: The bottom surface of the microporous PET film (12) is fixedly connected to the top surface of the high-density vertical cotton body (13).

5. The nonwoven sound-absorbing and sound-insulating three-dimensional vertical cotton according to claim 4, characterized in that: The bottom surface of the high-density vertical cotton body (13) is fixedly connected to the top surface of the honeycomb layer (21).

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