Sound absorption type noise reduction polyester wadding

Abstract

The utility model discloses sound absorption type noise reduction polyester wadding which comprises a first sound absorption layer, and second sound absorption layers are arranged on the two sides of the first sound absorption layer. The first sound absorption layer and the second sound absorption layer are connected through an adhesive; the first sound absorption layer is made of lake wool needle-punched non-woven fabric; the second sound absorption layer comprises a fibrilia layer, and low-melting-point polypropylene fiber layers are arranged on the two sides of the fibrilia layer. Based on the sound-absorbing noise-reducing polyester wadding, the first sound-absorbing layer and the second sound-absorbing layer are bonded through the adhesive, a plurality of air-containing gaps are reserved in a formed dimensional net structure, the porous characteristic is achieved, incident sound waves can generate friction and viscous force in the polyester wadding, and then the friction and viscous force are converted into other energy to be dissipated, so that the sound-absorbing noise-reducing polyester wadding has the sound-absorbing noise-reducing effect. Good sound absorption and noise reduction effects are achieved.

Description

Technical Field

[0001] The utility model relates to a spray-bonded cotton, in particular to a sound-absorbing and noise-reducing spray-bonded cotton. Background Art

[0002] How to effectively control noise and develop materials with excellent noise reduction performance is a very important problem to be solved. Sound absorption is a process in which sound waves are gradually consumed when incident on a medium. Part of the sound energy is incident into the material and the other part is reflected. The incident sound waves generate friction and viscous forces inside the material, and then are converted into other energies and dissipated. Fiber materials have good physical and mechanical properties. Due to the unique structure of fibers, fibers have good sound absorption performance and are often used as sound-absorbing and noise-reducing materials. Therefore, this application provides a sound-absorbing and noise-reducing spray-bonded cotton. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a sound-absorbing and noise-reducing spray-bonded cotton, which is intended to have the functions of sound absorption and noise reduction, reduce noise pollution, and is suitable for use as sound-absorbing and noise-reducing materials for automobile interiors.

[0004] To solve the above technical problems, the purpose of the utility model is realized as follows: A sound-absorbing and noise-reducing spray-bonded cotton, comprising: a first sound-absorbing layer, and second sound-absorbing layers are arranged on both sides of the first sound-absorbing layer; the first sound-absorbing layer and the second sound-absorbing layers are connected by an adhesive; the first sound-absorbing layer is a lake wool needle-punched non-woven fabric; the second sound-absorbing layer includes a hemp fiber layer, and low-melting-point polypropylene fiber layers are arranged on both sides of the hemp fiber layer.

[0005] Based on the above solution and as a preferred solution of the above solution: The lake wool needle-punched non-woven fabric is subjected to fulling finishing.

[0006] Based on the above solution and as a preferred solution of the above solution: The thickness of the lake wool needle-punched non-woven fabric is 3.5-5 mm.

[0007] Based on the above solution and as a preferred solution of the above solution: A polypropylene spunbond non-woven fabric is arranged on the side of the second sound-absorbing layer away from the first sound-absorbing layer.

[0008] Based on the above solution and as a preferred solution of the above solution: A polyacrylonitrile nanofiber membrane is arranged on the side of the polypropylene spunbond non-woven fabric away from the second sound-absorbing layer.

[0009] The beneficial effect of the utility model is: Based on the sound-absorbing and noise-reducing spray-bonded cotton of the utility model, the first sound-absorbing layer and the second sound-absorbing layers are bonded by an adhesive. In the formed three-dimensional network structure, there are many air-containing voids, which has the characteristic of porosity, is conducive to the generation of friction and viscous forces of incident sound waves inside the spray-bonded cotton, and then is converted into other energies and dissipated, and has a good sound absorption and noise reduction effect. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the sound-absorbing and noise-reducing spray-bonded nonwoven fabric involved in the first embodiment;

[0011] Figure 2 It is a schematic structural diagram of the sound-absorbing and noise-reducing spray-bonded nonwoven fabric involved in the second embodiment;

[0012] In the figure: 1 - the first sound-absorbing layer, 2 - the second sound-absorbing layer, 3 - polypropylene spunbond nonwoven fabric, 4 - polyacrylonitrile nanofiber membrane. Detailed Description of the Invention

[0013] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0014] First Embodiment

[0015] Combined with Figure 1 This embodiment will be described in detail. A sound-absorbing and noise-reducing spray-bonded nonwoven fabric includes: a first sound-absorbing layer 1, and second sound-absorbing layers 2 are arranged on both sides of the first sound-absorbing layer 1; the first sound-absorbing layer 1 and the second sound-absorbing layers 2 are connected by an adhesive; the first sound-absorbing layer 1 is a lake wool needle-punched nonwoven fabric; the second sound-absorbing layer 2 includes a hemp fiber layer, and low-melting-point polypropylene fiber layers are arranged on both sides of the hemp fiber layer.

[0016] The spray-bonded nonwoven fabric is a common nonwoven fabric structure. Its formation principle is to spray the adhesive on both sides of the fluffy fiber layer. Due to a certain pressure during spraying, the adhesive can also penetrate into the interior of the fiber layer. After the fiber layer sprayed with the adhesive is dried and cured, the intersection points between the fibers are bonded. The fibers that are not bonded inside still have a certain degree of freedom. At the same time, in the three-dimensional network structure, there are still many air-containing voids. Therefore, the fiber layer has the characteristic of porosity, which is beneficial to the generation of friction and viscous force of the incident sound wave inside the spray-bonded nonwoven fabric, and then it is converted into other energy and dissipated, having a good sound-absorbing and noise-reducing effect.

[0017] Lake wool has a distinct medulla layer, which is a porous structure composed of loosely connected cells and bubbles, and the bubble wall is composed of keratin materials of different densities. Generally speaking, the more medulla layers of wool, the thicker the fiber and the lower the strength, but the porous structure of the medullary cavity can improve the sound absorption performance of lake wool. Lake wool needle-punched non-woven fabric is obtained by needle-punching lake wool. The fibers are entangled with each other to form a three-dimensional fiber network. There are many interconnected holes of different sizes between the fibers. When sound waves enter the wool needle-punched non-woven fabric, they drive the air between the internal pores to vibrate, while the air close to the fiber surface remains relatively static under the influence of the interface. The viscous resistance of the air and the mutual friction between the two convert part of the sound energy into heat energy, thereby attenuating the sound energy; on the other hand, because the medullary cavity of lake wool is a loose porous structure, when sound waves enter the cavity, they drive the air inside the medulla layer to collide and rub against the inner wall of the fiber, so that part of the sound energy is also converted into heat energy and consumed.

[0018] Furthermore, the lake wool needle-punched nonwoven fabric is subjected to milling finishing. The lake wool scales are covered in cracks, the scales are very wide, and the warping is obvious. This scale structure makes the lake wool have good milling performance. The lake wool needle-punched nonwoven fabric that has been milled has its fibers more tightly wound than before the milling finishing, so that the surface density of the lake wool needle-punched nonwoven fabric is increased, the pore size is reduced, and the sound absorption performance is improved.

[0019] Furthermore, the thickness of the lake wool needle-punched nonwoven fabric is 3.5-5 mm. When the material thickness is greater than 3.5 mm, its sound absorption coefficient is greater than 50% in the high frequency range, and it is a highly efficient sound absorption material that can meet the sound absorption performance requirements.

[0020] The second sound absorbing layer 2 has the properties of high strength, sound insulation, and sound absorption, and polypropylene is relatively cheap. The chemical composition of polypropylene is the simplest, consisting of only two elements, C and H, and it is the easiest to recycle and reuse among synthetic fibers. Therefore, the second sound absorbing layer 2 also has the advantages of being pollution-free and low-cost.

[0021] Embodiment 2

[0022] Combination Figure 2 This embodiment is described in detail. Based on the first embodiment, a polypropylene spunbond nonwoven fabric 3 is provided on the side of the second sound absorbing layer 2 away from the first sound absorbing layer 1. Furthermore, a polyacrylonitrile nanofiber membrane 4 is provided on the side of the polyacrylonitrile nanofiber membrane away from the second sound absorbing layer 2.

[0023] Specifically, the polypropylene spunbond nonwoven fabric 3 is mounted on a receiving roller, nanofibers are sprayed onto the polypropylene spunbond nonwoven fabric 3 by electrostatic spinning to form a polyacrylonitrile nanofiber membrane 4, and then the polypropylene spunbond nonwoven fabric 3 with the polyacrylonitrile nanofiber membrane 4 is bonded to the second sound absorbing layer 2.

[0024] By superimposing the polyacrylonitrile nanofiber membrane 4 on the polypropylene spunbond nonwoven fabric 3, to a certain extent, the sound absorption coefficient of the sprayed cotton can be improved in the full frequency band. Moreover, as the areal density of the polyacrylonitrile nanofiber membrane 4 increases, the peak value of the sound absorption coefficient of the sprayed cotton gradually moves towards the middle and low frequencies, and the sound absorption coefficient below 3000 Hz is also improved, which helps to improve the low-frequency sound absorption performance of the sprayed cotton.

[0025] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. A sound-absorbing noise-reducing spray-bonded nonwoven fabric, characterized in that, Comprising: A first sound-absorbing layer (1), with second sound-absorbing layers (2) provided on both sides of the first sound-absorbing layer (1); the first sound-absorbing layer (1) and the second sound-absorbing layers (2) are connected by an adhesive; the first sound-absorbing layer (1) is a lake wool needle-punched non-woven fabric; the second sound-absorbing layer (2) includes a hemp fiber layer, and both sides of the hemp fiber layer are low-melting-point polypropylene fiber layers.

2. The sound-absorbing and noise-reducing spray-bonded nonwoven fabric according to claim 1, wherein, The lake wool needle-punched non-woven fabric has been subjected to fulling finishing.

3. The sound-absorbing and noise-reducing spray-bonded cotton according to claim 1, wherein The thickness of the lake wool needle-punched non-woven fabric is 3.5 - 5 mm.

4. The sound-absorbing and noise-reducing spray-bonded nonwoven fabric according to claim 1, wherein On one side of the second sound-absorbing layer (2) away from the first sound-absorbing layer (1), a polypropylene spunbond non-woven fabric (3) is provided.

5. The sound-absorbing and noise-reducing spray-bonded nonwoven fabric according to claim 4, wherein On one side of the polypropylene spunbond non-woven fabric (3) away from the second sound-absorbing layer (2), a polyacrylonitrile nanofiber membrane (4) is provided.

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