Two-component laminated thin-surface sound-absorbing cotton structure with internally-planted melt-blown filaments

Abstract

The utility model discloses a double-component laminated thin-surface sound-absorbing cotton structure internally planted with melt-blown filaments. The double-component laminated thin-surface sound-absorbing cotton structure comprises a sound-absorbing cotton body, a fiber net layer located on the upper portion of the sound-absorbing cotton body, a lower non-woven fabric layer located on the lower portion of the sound-absorbing cotton body and an upper non-woven fabric layer located on the upper portion of the fiber net layer. A plurality of inclined interlayers arranged at equal intervals are arranged in the sound-absorbing cotton body, and melt-blown double-component sound-absorbing fibers are arranged in the inclined interlayers. The PET felt with low cost serves as the sound-absorbing cotton body, the inclined interlayers arranged at equal intervals are additionally arranged in the sound-absorbing cotton body, the melt-blown two-component sound-absorbing fibers are arranged in the inclined interlayers, on the premise that the sound-absorbing effect is guaranteed to the maximum degree, cost is greatly saved, and the sound-absorbing cotton can be applied to large-area use positions such as automobile roofs or bottom plates and the like, and has good application prospects. And compared with all double-component fibers, the cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sound-absorbing cotton, in particular to a double-component laminated thin-surface sound-absorbing cotton structure with implanted melt-blown filaments. Background Technique

[0002] With the rapid development and intelligentization of the automotive industry, the application of sound-absorbing cotton in the automotive industry is becoming more and more extensive, which can play the roles of sound absorption, heat insulation and lightweight. Automotive sound-absorbing materials are used not only for the ceiling, floor, hood, fender, dashboard perimeter, but also for the engine hood and air-conditioning duct, etc. In mid- to high-class cars, as much sound-absorbing material as possible is filled in spaces such as inside the door pillars to improve the overall sound insulation effect of the car.

[0003] Double-component sound-absorbing cotton generally refers to a sound-absorbing material composed of two kinds of fibers, PP (polypropylene) and PET (polyester), belonging to fibrous porous sound-absorbing materials, with a three-dimensional network continuous porous structure. The diameter of polypropylene fibers is about 2μm, and the diameter of polyester fibers is about 25μm. Its production process flow is: melting and extruding PP raw materials → blowing and melting with high-temperature and high-pressure air to form long fibers → cooling and crystallizing and then mixing with PET short fibers. The sound absorption principle of sound-absorbing cotton is that when sound waves vibrate through the pores between fibers, due to effects such as frictional loss, the energy of sound waves is converted into heat energy, thus achieving an effective shielding and isolation effect on sound waves of different frequencies. After testing, the sound absorption effect of double-component sound-absorbing cotton is better than that of traditional sound-absorbing materials, such as PET felt and PU foam materials, but its manufacturing cost is also correspondingly higher.

[0004] It can be seen that for the whole vehicle, the use of sound-absorbing cotton is increasing. If high-grade sound-absorbing cotton is uniformly used, it will inevitably lead to an increase in cost. Therefore, how to further optimize the sound-absorbing cotton to ensure the sound absorption effect while maintaining the sound absorption effect is very important. Content of the Utility Model

[0005] In view of the above problems, the utility model provides a double-component laminated thin-surface sound-absorbing cotton structure with implanted melt-blown filaments.

[0006] The technical solution of the utility model is as follows:

[0007] A double-component laminated thin-surface sound-absorbing cotton structure with implanted melt-blown filaments, comprising a sound-absorbing cotton main body, a fiber mesh layer located above the sound-absorbing cotton main body, a lower non-woven fabric layer located below the sound-absorbing cotton main body, and an upper non-woven fabric layer located above the fiber mesh layer;

[0008] Inside the main body of the sound-absorbing cotton, there are several inclined interlayers arranged at equal intervals. The inclined interlayers are internally provided with melt-blown bicomponent sound-absorbing fibers. The depth of the inclined interlayer is 90-100% of the thickness of the main body of the sound-absorbing cotton. The inclined interlayer extends obliquely downward from the upper surface of the main body of the sound-absorbing cotton, and the extending directions of all inclined interlayers are the same. In the cross-section, the extending inclination direction of the inclined interlayer forms an angle of 20-30° with the upper surface of the main body of the sound-absorbing cotton. In the horizontal plane, the trend of the inclined interlayer forms an angle of 45±1° with the horizontal axis where the main body of the sound-absorbing cotton is located.

[0009] Furthermore, the main body of the sound-absorbing cotton is a PET felt.

[0010] Note: Using the PET felt as the main body of the sound-absorbing cotton can reduce costs and ensure a certain sound-absorbing effect.

[0011] Furthermore, the fiber mesh layer is a nylon fiber mesh layer or a cotton fiber mesh layer.

[0012] Note: By arranging the fiber mesh layer above the inclined interlayer, the noise is dispersed and then enters the inclined interlayers arranged at equal intervals, further improving the sound-absorbing effect.

[0013] Furthermore, the thickness of the main body of the sound-absorbing cotton is 5-30 mm.

[0014] Furthermore, the thickness of the fiber mesh layer is 2-6 mm.

[0015] Furthermore, the thickness of the lower non-woven fabric layer is 10-20 mm, and the thickness of the upper non-woven fabric layer is 10-20 mm.

[0016] Furthermore, the distance between two adjacent inclined interlayers at the head and tail is 5-10 mm, the distance between two adjacent inclined interlayers on the left and right is 3-6 mm, the length of the inclined interlayer is 5-25 cm, and the width of the inclined interlayer is 4-10 mm.

[0017] Note: By optimizing and adjusting the distance and size between each inclined interlayer, while ensuring the sound-absorbing effect, the amount of raw materials used is reduced, saving costs.

[0018] The beneficial effects of the present utility model are:

[0019] A double-component laminated thin surface sound-absorbing cotton structure with implanted melt-blown filaments in the present utility model uses a PET felt with a relatively low cost as the main body of the sound-absorbing cotton. Several inclined interlayers arranged at equal intervals are added inside the main body of the sound-absorbing cotton, and melt-blown bicomponent sound-absorbing fibers are provided inside the inclined interlayers. On the premise of maximizing the sound-absorbing effect, the cost is greatly saved. It can be applied to large-area use such as the car ceiling or floor, and effectively reduces the cost compared with all double-component fibers. Description of the Drawings

[0020] Figure 1 It is a cross-sectional view of a two-component laminated thin surface sound-absorbing cotton structure with implanted melt-blown filaments of the present utility model;

[0021] Figure 2 It is a top view of the sound-absorbing cotton main body in a two-component laminated thin surface sound-absorbing cotton structure with implanted melt-blown filaments of the present utility model.

[0022] Among them, 1 - sound-absorbing cotton main body, 2 - fiber mesh layer, 3 - lower non-woven fabric layer, 4 - upper non-woven fabric layer, 5 - inclined sandwich layer. Specific implementation manner

[0023] Example 1

[0024] As Figure 1 shown, a two-component laminated thin surface sound-absorbing cotton structure with implanted melt-blown filaments includes a sound-absorbing cotton main body 1, a fiber mesh layer 2 located above the sound-absorbing cotton main body 1, a lower non-woven fabric layer 3 located below the sound-absorbing cotton main body 1, and an upper non-woven fabric layer 4 located above the fiber mesh layer 2. The sound-absorbing cotton main body 1 is a PET felt, and the fiber mesh layer 2 is a nylon fiber mesh layer;

[0025] The thickness of the sound-absorbing cotton main body 1 is 20 mm, the thickness of the fiber mesh layer 2 is 4 mm, the thickness of the lower non-woven fabric layer 3 is 15 mm, and the thickness of the upper non-woven fabric layer 4 is 15 mm;

[0026] As Figure 1 and Figure 2 shown, several equally spaced inclined sandwich layers 5 are provided inside the sound-absorbing cotton main body 1. Melt-blown two-component sound-absorbing fibers are provided inside the inclined sandwich layers 5. The depth of the inclined sandwich layers 5 is 95% of the thickness of the sound-absorbing cotton main body 1. The inclined sandwich layers 5 extend obliquely downward from the upper surface of the sound-absorbing cotton main body 1. The extending directions of the inclined sandwich layers 5 are the same. In the cross-section, the extending inclination direction of the inclined sandwich layers 5 forms a 25° angle with the upper surface of the sound-absorbing cotton main body 1. In the horizontal plane, the running direction of the inclined sandwich layers 5 forms a 45° angle with the horizontal axis where the sound-absorbing cotton main body 1 is located. The distance between two adjacent inclined sandwich layers 5 at the head and tail is 7 mm, the distance between two adjacent inclined sandwich layers 5 on the left and right is 5 mm. The length of the inclined sandwich layers 5 is 15 cm, and the width of the inclined sandwich layers 5 is 6 mm. Among them, the PP content of the melt-blown two-component sound-absorbing fibers is 60%, and the PET content is 40%.

[0027] Example 2

[0028] The difference between this example and Example 1 is that:

[0029] The fiber mesh layer 2 is a cotton fiber mesh layer.

[0030] Example 3

[0031] The difference between this example and Example 1 is that:

[0032] The thickness of the sound-absorbing cotton main body 1 is 5 mm, the thickness of the fiber mesh layer 2 is 2 mm, the thickness of the lower non-woven fabric layer 3 is 10 mm, and the thickness of the upper non-woven fabric layer 4 is 10 mm.

[0033] Example 4

[0034] The difference between this example and Example 1 is as follows:

[0035] The thickness of the sound-absorbing cotton main body 1 is 30 mm, the thickness of the fiber mesh layer 2 is 6 mm, the thickness of the lower non-woven fabric layer 3 is 20 mm, and the thickness of the upper non-woven fabric layer 4 is 20 mm.

[0036] Example 5

[0037] The difference between this example and Example 1 is as follows:

[0038] A number of inclined interlayers 5 arranged at equal intervals are provided inside the sound-absorbing cotton main body 1. The inside of the inclined interlayer 5 is provided with melt-blown bicomponent sound-absorbing fibers. The depth of the inclined interlayer 5 is 90% of the thickness of the sound-absorbing cotton main body 1. The inclined interlayer 5 extends obliquely downward from the upper surface of the sound-absorbing cotton main body 1. The extending directions of the inclined interlayers 5 are the same. In the cross-section, the extending inclination direction of the inclined interlayer 5 forms a 20° angle with the upper surface of the sound-absorbing cotton main body 1. In the horizontal plane, the running direction of the inclined interlayer 5 forms a 44° angle with the horizontal axis where the sound-absorbing cotton main body 1 is located. The distance between two adjacent inclined interlayers 5 at the head and tail is 5 mm, the distance between two adjacent inclined interlayers 5 on the left and right is 3 mm, the length of the inclined interlayer 5 is 5 cm, and the width of the inclined interlayer 5 is 4 mm.

[0039] Example 6

[0040] The difference between this example and Example 1 is as follows:

[0041] A number of inclined interlayers 5 arranged at equal intervals are provided inside the sound-absorbing cotton main body 1. The inside of the inclined interlayer 5 is provided with melt-blown bicomponent sound-absorbing fibers. The depth of the inclined interlayer 5 is 100% of the thickness of the sound-absorbing cotton main body 1. The inclined interlayer 5 extends obliquely downward from the upper surface of the sound-absorbing cotton main body 1. The extending directions of the inclined interlayers 5 are the same. In the cross-section, the extending inclination direction of the inclined interlayer 5 forms a 30° angle with the upper surface of the sound-absorbing cotton main body 1. In the horizontal plane, the running direction of the inclined interlayer 5 forms a 46° angle with the horizontal axis where the sound-absorbing cotton main body 1 is located. The distance between two adjacent inclined interlayers 5 at the head and tail is 10 mm, the distance between two adjacent inclined interlayers 5 on the left and right is 6 mm, the length of the inclined interlayer 5 is 25 cm, and the width of the inclined interlayer 5 is 10 mm.

[0042] Description: Even if the depth of the inclined interlayer 5 is 100% of the thickness of the sound-absorbing cotton main body 1, the inclined interlayer 5 will not penetrate through the sound-absorbing cotton main body 1 to the bottom because the inclined interlayer 5 is inclined. At the same time, the non-woven fabric layer 3 is always located inside the vehicle whether it is used for the car roof or the bottom plate.

[0043] By adopting the double-component laminated thin sound-absorbing cotton structure with implanted melt-blown filaments of the present utility model, compared with the whole vehicle roof or bottom plate fully adopting double-component sound-absorbing cotton, the cost is saved by 40-50%;

[0044] At the same time, under the noise condition of 3000 Hz, the double-component laminated thin sound-absorbing cotton structure with implanted melt-blown filaments of the present utility model is only about 3 dB higher in noise volume than the whole vehicle roof or bottom plate fully adopting double-component sound-absorbing cotton, and the speech clarity inside the vehicle is almost the same, indicating that adopting the double-component laminated thin sound-absorbing cotton structure with implanted melt-blown filaments of the present utility model can ensure the sound insulation effect.

Claims

1. A two-component laminated thin surface sound-absorbing cotton structure with implanted melt-blown filaments, characterized in that, It includes a sound-absorbing cotton main body (1), a fiber mesh layer (2) located above the sound-absorbing cotton main body (1), a lower non-woven fabric layer (3) located below the sound-absorbing cotton main body (1), and an upper non-woven fabric layer (4) located above the fiber mesh layer (2); A number of inclined interlayers (5) arranged at equal intervals are provided inside the sound-absorbing cotton main body (1). Melt-blown bicomponent sound-absorbing fibers are provided inside the inclined interlayers (5). The depth of the inclined interlayers (5) is 90-100% of the thickness of the sound-absorbing cotton main body (1). The inclined interlayers (5) extend obliquely downward from the upper surface of the sound-absorbing cotton main body (1). The extending directions of the respective inclined interlayers (5) are the same. In the cross-section, the extending inclination direction of the inclined interlayer (5) forms an angle of 20-30° with the upper surface of the sound-absorbing cotton main body (1). In the horizontal plane, the running direction of the inclined interlayer (5) forms an angle of 45±1° with the horizontal axis where the sound-absorbing cotton main body (1) is located.

2. The structure of a two-component laminated thin surface sound-absorbing cotton with implanted melt-blown filaments according to claim 1, characterized in that, The sound-absorbing cotton main body (1) is a PET felt.

3. The structure of a two-component laminated thin surface sound-absorbing cotton with implanted melt-blown filaments according to claim 1, characterized in that, The fiber mesh layer (2) is a nylon fiber mesh layer or a cotton fiber mesh layer.

4. The dual-component laminated thin surface sound-absorbing cotton structure with implanted melt-blown filaments according to claim 1, characterized in that, The thickness of the sound-absorbing cotton main body (1) is 5-30 mm.

5. The structure of the two-component laminated thin surface sound-absorbing cotton with implanted melt-blown filaments according to claim 1, characterized in that, The thickness of the fiber mesh layer (2) is 2-6 mm.

6. The dual-component laminated thin surface sound-absorbing cotton structure with implanted melt-blown filaments according to claim 1, characterized in that, The thickness of the lower non-woven fabric layer (3) is 10-20 mm, and the thickness of the upper non-woven fabric layer (4) is 10-20 mm.

7. The structure of a two-component laminated thin surface sound-absorbing cotton with implanted melt-blown filaments according to claim 1, characterized in that, The distance between two adjacent inclined interlayers (5) at the head and tail is 5-10 mm, the distance between two adjacent inclined interlayers (5) on the left and right is 3-6 mm. The length of the inclined interlayer (5) is 5-25 cm, and the width of the inclined interlayer (5) is 4-10 mm.

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