Composite EVA (Ethylene Vinyl Acetate) sound-absorbing foam

Abstract

The utility model discloses composite EVA (Ethylene Vinyl Acetate) sound-absorbing foam and relates to the technical field of foam. Comprising a main body layer, the main body layer is made of EVA foam, a plurality of first through holes are formed in the main body layer in a penetrating mode in the thickness direction of the main body layer, and the first through holes are distributed in a matrix mode; the first noise reduction layer and the second noise reduction layer are arranged on the upper side and the lower side of the main body layer respectively, the sections of the first noise reduction layer and the second noise reduction layer are wavy, second through holes are formed in the wave crests in the thickness direction in a penetrating mode, and third through holes are formed in the wave troughs in the thickness direction in a penetrating mode. The second through holes and the third through holes are filled with silencing granular materials; by adopting the technical scheme provided by the invention, the sound absorption performance of the foam can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of EVA foam, in particular to a composite EVA sound-absorbing foam. Background Art

[0002] Foam is a material made by foaming plastic particles. Foam has a series of characteristics such as elasticity, light weight, fast pressure-sensitive fixation, easy use, easy bending, ultra-thin volume, and reliable performance. The performance of traditional foam is relatively single. In order to make foam have different characteristics, foam is now combined with other materials to meet different needs.

[0003] Chinese patent "202221921973.5" discloses a sound-absorbing and shock-absorbing foam, which achieves a shock-absorbing effect by combining a shock-absorbing rubber layer with a foam layer, and at the same time cooperates with a sound-absorbing and sound-insulating layer to achieve a sound-absorbing and sound-insulating effect; but further analysis shows that it mainly utilizes the characteristics of composite materials, and has high requirements on the performance of the material itself, and the upper limit of the sound absorption performance is limited by the performance of the material itself; this application aims to further combine structural optimization on this basis to improve the overall sound absorption performance. Utility Model Content

[0004] The utility model aims to provide a composite EVA sound-absorbing foam to solve at least one of the above-mentioned technical problems.

[0005] In order to solve the above technical problems, the utility model provides a composite EVA sound-absorbing foam, including a main body layer, the main body layer is made of EVA foam, the main body layer is penetrated along the thickness direction to form a plurality of first through holes, and the first through holes are distributed in a matrix;

[0006] A first sound-absorbing layer and a second sound-absorbing layer, wherein the first sound-absorbing layer and the second sound-absorbing layer are respectively arranged on the upper and lower sides of the main body layer, the first sound-absorbing layer and the second sound-absorbing layer are wavy in cross section, a second through hole is formed through the thickness direction at the wave crest, and a third through hole is formed at the wave trough along the thickness direction, and the second through hole and the third through hole are filled with sound-absorbing granular material;

[0007] A first buffer layer and a second buffer layer, wherein the first buffer layer is disposed above the first sound-absorbing layer, and the second buffer layer is disposed below the second sound-absorbing layer;

[0008] A third sound-absorbing layer and a fourth sound-absorbing layer, wherein the third sound-absorbing layer is arranged above the first buffer layer, and the fourth sound-absorbing layer is arranged below the second buffer layer; the third sound-absorbing layer and the fourth sound-absorbing layer are polyester fiber cotton;

[0009] In the above implementation process, the sound-absorbing foam provided by the present application adopts a double-layer symmetrical composite structure, wherein the main layer is EVA foam, which is formed with multiple first through holes, which can reduce the use of materials while ensuring sufficient elasticity and strength, and make the whole lighter; the third sound-absorbing layer and the fourth sound-absorbing layer are located in the outermost layer, which are made of polyester fiber cotton. When sound waves are received, the sound waves are subjected to friction between the micropores in the polyester fiber cotton and the air in the holes, and the kinetic energy is converted into heat energy consumption; in addition, the flame retardant performance of the foam as a whole can be improved by selecting flame-retardant polyester fiber cotton, that is, the outermost layer When the third and fourth sound-absorbing layers of the layer are made of flame-retardant polyester fiber cotton, they can not only play a sound-absorbing role, but also achieve flame retardancy to prevent the fire from spreading to the internal materials; taking the sound wave passing through the third sound-absorbing layer as an example, it then enters the first buffer layer, the first buffer layer plays a buffering role, and then further enters the second sound-absorbing layer. The cross-section of the second sound-absorbing layer is wavy, which can gradually weaken the sound wave during the transmission process, further improving the sound absorption capacity; and the corresponding second and third through holes are filled with sound-absorbing granular materials, which can receive sound wave vibrations, further improving the sound absorption capacity.

[0010] Preferably, the second through hole and the first through hole are arranged alternately, and the third through hole and the first through hole are arranged alternately;

[0011] In the above implementation process, the second through hole and the third through hole are arranged alternately with the first through hole, which can prevent the sound-absorbing particles from entering the first through hole.

[0012] Preferably, the first sound-absorbing layer and the second sound-absorbing layer are made of polyester fibers;

[0013] In the above implementation process, the first sound-absorbing layer and the second sound-absorbing layer are not only structurally optimized to achieve a step-by-step reduction of sound waves, but also cooperate with the characteristics of the polyester fiber material to further enhance its sound absorption performance.

[0014] Preferably, an aerogel layer is attached to the outer surface of the third sound-absorbing layer and the fourth sound-absorbing layer;

[0015] In the above implementation process, the third sound-absorbing layer and the fourth sound-absorbing layer are located in the outermost layer. By further arranging an aerogel layer on the surface thereof, the insulation characteristics can be utilized to achieve sound insulation, which plays a preliminary blocking role on the sound waves, while the sound waves further passing through the aerogel layer are weakened, and a good sound-absorbing effect is achieved under the subsequent gradual weakening effect.

[0016] Preferably, the first buffer layer and the second buffer layer are polypropylene foam;

[0017] In the above implementation process, this solution selects polypropylene foam as the first buffer layer and the second buffer layer, which has strong impact resistance and buffering performance. Therefore, the sound-absorbing foam provided by this application can have excellent sound absorption performance while also having good impact resistance and buffering performance.

[0018] Preferably, the sound-absorbing granular material comprises glass fiber particles.

[0019] Preferably, a support column is filled in the first through hole;

[0020] Preferably, the support column is made of butyl rubber material;

[0021] In the above implementation process, the present solution further arranges a support column in the first through hole and is made of butyl rubber, which can enhance the supporting strength of the main layer and also has a certain elasticity, thereby further enhancing the overall cushioning performance of the sound-absorbing foam.

[0022] Compared with the prior art, the beneficial effects of the utility model are as follows: the sound-absorbing foam provided by the present application adopts a double-layer symmetrical composite structure, wherein the main layer is EVA foam, which is formed with a plurality of first through holes, which can reduce the use of materials while ensuring sufficient elasticity and strength, and at the same time make the whole lighter; the third sound-absorbing layer and the fourth sound-absorbing layer are located on the outermost layer, which are made of polyester fiber cotton. When sound waves are received, the sound waves are subjected to friction between the micropores in the polyester fiber cotton and the air in the holes, and the kinetic energy is converted into heat energy consumption; in addition, the flame retardant performance of the foam as a whole can be improved by selecting flame retardant polyester fiber cotton That is, when the third and fourth sound-absorbing layers located on the outermost layer are made of flame-retardant polyester fiber cotton, they can not only play a sound-absorbing role, but also achieve flame retardancy to prevent the fire from spreading to the internal materials; taking the sound wave passing through the third sound-absorbing layer as an example, it then enters the first buffer layer, the first buffer layer plays a buffering role, and then further enters the second sound-absorbing layer. The cross-section of the second sound-absorbing layer is wavy, which can gradually weaken the sound wave during the transmission process, further improving the sound absorption capacity; and the corresponding second and third through holes are filled with sound-absorbing granular materials, which can receive sound wave vibrations, further improving the sound absorption capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a schematic diagram of the overall structure of one embodiment of the present application;

[0025] Figure 2 It is a partial structural schematic diagram of the main body layer of one embodiment of the present application;

[0026] Among them: 10, main body layer; 11, first through hole; 12, support column; 21, first sound-absorbing layer; 22, second sound-absorbing layer; 211, second through hole; 212, third through hole; 31, first buffer layer; 32, second buffer layer; 41, third sound-absorbing layer; 42, fourth sound-absorbing layer; 51, aerogel layer. DETAILED DESCRIPTION

[0027] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0028] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] In order to further understand the content, features and effects of the utility model, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0031] Example

[0032] Foam is a material made of foamed plastic particles. Foam has a series of characteristics such as elasticity, light weight, fast pressure-sensitive fixation, easy to use, easy to bend, ultra-thin volume, and reliable performance. The performance of traditional foam is relatively single. In order to make foam have different characteristics, foam is now combined with other materials to meet different needs. Chinese patent "202221921973.5" discloses a sound-absorbing and shock-absorbing foam, which achieves a shock-absorbing effect through a shock-absorbing rubber layer and a foam layer, and at the same time cooperates with a sound-absorbing and sound-insulating layer to achieve a sound-absorbing and sound-insulating effect; but further analysis shows that it mainly utilizes the characteristics of composite materials, and has high requirements on the performance of the material itself. The upper limit of the sound absorption performance is limited by the performance of the material itself; this application aims to further combine structural optimization on this basis to improve the overall sound absorption performance; in order to solve the above technical problems, this embodiment provides the following technical solutions:

[0033] For details, see Figure 1-2 This embodiment provides a composite EVA sound-absorbing foam, including a main body layer 10, a first sound-absorbing layer 21, a second sound-absorbing layer 22, a third sound-absorbing layer 41, a fourth sound-absorbing layer 42, a first buffer layer 31, and a second buffer layer 32;

[0034] For details, see Figure 2 The main body layer 10 is made of EVA foam, and a plurality of first through holes 11 are formed through the main body layer 10 along the thickness direction thereof, and the first through holes 11 are distributed in a matrix;

[0035] Specifically, the first sound-absorbing layer 21 and the second sound-absorbing layer 22 are respectively arranged on the upper and lower sides of the main body layer 10, and the cross-section of the first sound-absorbing layer 21 and the second sound-absorbing layer 22 is wavy, and a second through hole 211 is formed through the thickness direction at the wave crest, and a third through hole 212 is formed at the wave trough along the thickness direction, and the second through hole 211 and the third through hole 212 are filled with sound-absorbing granular material;

[0036] It is understandable that the structures of the first sound-absorbing layer 21 and the second sound-absorbing layer 22 can be approximately understood as arc-shaped protrusions;

[0037] Further, in some embodiments, the sound-absorbing particle material includes fiberglass particles;

[0038] Specifically, the first buffer layer 31 is disposed above the first sound-absorbing layer 21 , and the second buffer layer 32 is disposed below the second sound-absorbing layer 22 ;

[0039] Specifically, the third sound-absorbing layer 41 is disposed above the first buffer layer 31, and the fourth sound-absorbing layer 42 is disposed below the second buffer layer 32; the third sound-absorbing layer 41 and the fourth sound-absorbing layer 42 are polyester fiber cotton;

[0040] In the above scheme, the sound-absorbing foam provided by the present application adopts a double-layer symmetrical composite structure, wherein the main layer 10 is EVA foam, which is formed with a plurality of first through holes 11, which can reduce the use of materials while ensuring sufficient elasticity and strength, and make the whole lighter; the third sound-absorbing layer 41 and the fourth sound-absorbing layer 42 are located in the outermost layer, which are made of polyester fiber cotton. When sound waves are received, the sound waves are subjected to friction between the micropores in the polyester fiber cotton and the air in the holes, and the kinetic energy is converted into heat energy consumption; in addition, the flame retardant performance of the foam as a whole can be improved by selecting flame-retardant polyester fiber cotton, that is, the third sound-absorbing layer located in the outermost layer When the first and second sound-absorbing layers 41 and 42 are made of flame-retardant polyester fiber cotton, they can not only play a sound-absorbing role, but also achieve flame retardancy to prevent the fire from spreading to the internal materials; taking the sound wave passing through the third sound-absorbing layer 41 as an example, it then enters the first buffer layer 31, and the first buffer layer 31 plays a buffering role, and then further enters the second sound-absorbing layer 22. The cross-section of the second sound-absorbing layer 22 is wavy, which can gradually weaken the sound waves during the transmission process, further improving the sound absorption capacity; and the corresponding second through holes 211 and third through holes 212 are filled with sound-absorbing granular materials, which can receive sound wave vibrations, further improving the sound absorption capacity.

[0041] Specifically, the second through holes 211 are arranged alternately with the first through holes 11, and the third through holes 212 are arranged alternately with the first through holes 11;

[0042] In the above solution, the second through holes 211 and the third through holes 212 are arranged alternately with the first through holes 11 , so as to prevent the sound-absorbing particles from entering the first through holes 11 .

[0043] Specifically, the first sound-absorbing layer 21 and the second sound-absorbing layer 22 are made of polyester fibers;

[0044] In the above solution, the first sound-absorbing layer 21 and the second sound-absorbing layer 22 are not only structurally optimized to achieve a gradual reduction of sound waves, but also cooperate with the characteristics of the polyester fiber material to further improve its sound absorption performance.

[0045] Specifically, an aerogel layer 51 is attached to the outer surface of the third sound-absorbing layer 41 and the fourth sound-absorbing layer 42;

[0046] In the above scheme, the third sound-absorbing layer 41 and the fourth sound-absorbing layer 42 are located in the outermost layer. By further arranging an aerogel layer 51 on the surface thereof, the insulation characteristics can be utilized to achieve sound insulation, and play a preliminary blocking role on sound waves, while the sound waves further passing through the aerogel layer 51 are weakened, and a good sound-absorbing effect is achieved under the subsequent gradual weakening effect.

[0047] Furthermore, in some test methods, the aerogel layer 51 is specifically a silica aerogel layer 51, which can not only isolate sound waves, but also has certain flame retardant properties, which can further improve the flame retardant properties of the sound-absorbing foam.

[0048] Specifically, the first buffer layer 31 and the second buffer layer 32 are polypropylene foam;

[0049] In the above scheme, this scheme selects polypropylene foam as the first buffer layer 31 and the second buffer layer 32, which has strong impact resistance and buffering performance. Therefore, the sound-absorbing foam provided by this application can have excellent sound absorption performance while also having good impact resistance and buffering performance.

[0050] Specifically, in one of the test methods, the first through hole 11 is filled with a support column 12;

[0051] Furthermore, the support column 12 is made of butyl rubber material; in this solution, a support column 12 is further arranged in the first through hole 11 and is made of butyl rubber, which can enhance the supporting strength of the main layer 10 and also has a certain elasticity, which can further enhance the overall cushioning performance of the sound-absorbing foam.

[0052] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the scope of the technical solution of the present invention.

Claims

1. A composite EVA sound-absorbing foam, characterized in that: include A main body layer, the main body layer is made of EVA foam, and a plurality of first through holes are formed through the main body layer along the thickness direction, and the first through holes are distributed in a matrix; A first sound-absorbing layer and a second sound-absorbing layer, wherein the first sound-absorbing layer and the second sound-absorbing layer are respectively arranged on the upper and lower sides of the main body layer, the first sound-absorbing layer and the second sound-absorbing layer are wavy in cross section, a second through hole is formed through the thickness direction at the wave crest, and a third through hole is formed at the wave trough along the thickness direction, and the second through hole and the third through hole are filled with sound-absorbing granular material; A first buffer layer and a second buffer layer, wherein the first buffer layer is disposed above the first sound-absorbing layer, and the second buffer layer is disposed below the second sound-absorbing layer; The third sound-absorbing layer and the fourth sound-absorbing layer, the third sound-absorbing layer is arranged above the first buffer layer, and the fourth sound-absorbing layer is arranged below the second buffer layer; the third sound-absorbing layer and the fourth sound-absorbing layer are polyester fiber cotton.

2. The composite EVA sound-absorbing foam according to claim 1, characterized in that: The second through holes are arranged alternately with the first through holes, and the third through holes are arranged alternately with the first through holes.

3. The composite EVA sound-absorbing foam according to claim 1, characterized in that: The first sound-absorbing layer and the second sound-absorbing layer are made of polyester fibers.

4. The composite EVA sound-absorbing foam according to claim 1, characterized in that: Aerogel layers are attached to the outer surfaces of the third sound-absorbing layer and the fourth sound-absorbing layer.

5. The composite EVA sound-absorbing foam according to claim 1, characterized in that: The first buffer layer and the second buffer layer are polypropylene foam.

6. The composite EVA sound-absorbing foam according to claim 1, characterized in that: The sound-damping particulate material includes fiberglass particles.

7. The composite EVA sound-absorbing foam according to any one of claims 1 to 6, characterized in that: The first through hole is filled with a supporting column.

8. The composite EVA sound-absorbing foam according to claim 7, characterized in that: The support column is made of butyl rubber material.

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