Ceramic fiber roll paper flame-retardant sound-absorbing structure and its preparation method

Abstract

This invention relates to a ceramic fiber roll paper flame-retardant sound-absorbing structure and its preparation method, belonging to the field of sound absorption and noise reduction technology. The ceramic fiber roll paper flame-retardant sound-absorbing structure includes wide ceramic fiber strips and narrow ceramic fiber paper strips, which are stacked and rolled into several layers in a spiral shape, with air gaps formed between adjacent wide and narrow ceramic fiber paper strips. The preparation method includes the following steps: cutting the ceramic fiber paper into two types of strips, wide and narrow ceramic fiber paper strips; attaching the narrow ceramic fiber paper strips to the bottom of the wide ceramic fiber strips to form a strip that is thicker on one side and thinner on the other; starting from one end, rolling is performed, with the thicker side of the wide ceramic fiber strip tightly attached, until the entire strip is rolled into a spiral shape. Through the rational design of the structure, utilizing the interplay between the gaps formed by the rolling of the ceramic fiber paper and the pores of the material itself, high-performance sound absorption is achieved, while also giving the structure fire-resistant and heat-resistant properties.

Description

Technical Field

[0001] This invention relates to a ceramic fiber roll flame-retardant sound-absorbing structure and its preparation method, belonging to the field of sound absorption and noise reduction technology. Background Technology

[0002] Noise has become a significant environmental problem in human life, impacting health and causing conditions such as hearing loss, sleep disorders, irritability, and serious mental illnesses. Controlling noise through sound insulation and absorption is crucial for environmental improvement. Porous materials, containing numerous interconnected pores, convert kinetic energy into heat through air vibrations near the material's surface when sound waves enter, resulting in excellent sound absorption. Currently, commonly used sound-absorbing materials include foam, synthetic fibers, and artificial fibers, but their poor heat resistance severely limits their fire-retardant properties.

[0003] Fire-resistant sound-absorbing materials are multifunctional materials applicable to construction, industry, and automotive fields. In construction, they can be applied to walls, ceilings, floors, doors, and windows, providing sound insulation, noise reduction, and fire protection. In industry, they can reduce machine noise and improve the working environment. In the automotive sector, they can reduce engine and wind noise, improving passenger comfort. Furthermore, with increasing demands for safety and environmental protection, the demand for fire-resistant sound-absorbing materials continues to grow.

[0004] In recent years, porous ceramic materials have attracted widespread attention due to their superior advantages in low density, high strength, high temperature resistance, and fire resistance. However, the inherent brittleness of ceramic materials limits the application of porous ceramic assembly processes. Furthermore, because the pores formed in porous ceramic materials are mostly open, they hinder the penetration of sound waves into the material, instead reflecting them and failing to achieve a sound absorption effect. Therefore, developing a sound-absorbing structure with fire-retardant properties is of significant engineering importance. Summary of the Invention

[0005] One of the objectives of this invention is to provide a ceramic fiber roll paper flame-retardant sound-absorbing structure. Through the rational design of the structure, the interplay between the gaps formed by the rolling of ceramic fiber paper and the pores of the material itself is utilized to achieve high-performance sound absorption and give the structure fire-resistant and heat-resistant properties.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A ceramic fiber roll paper flame-retardant sound-absorbing structure includes wide ceramic fiber paper strips and narrow ceramic fiber paper strips. The wide and narrow ceramic fiber paper strips are stacked and rolled into several layers and spirally rolled. An air gap is formed between adjacent wide and narrow ceramic fiber paper strips.

[0008] In the preferred embodiment of the ceramic fiber roll flame-retardant and sound-absorbing structure, the thickness of the wide and narrow ceramic fiber paper strips is 0.5~5 mm.

[0009] In the preferred embodiment of the ceramic fiber roll flame-retardant and sound-absorbing structure, the width of the wide ceramic fiber paper strip is 10~100 mm.

[0010] In the preferred embodiment of the ceramic fiber roll flame-retardant and sound-absorbing structure, the width of the narrow ceramic fiber paper strip is 1~10 mm.

[0011] The preferred embodiment of the ceramic fiber roll flame-retardant sound-absorbing structure has a cross-sectional shape that is circular, triangular, or petal-shaped.

[0012] Another objective of this invention is to provide a method for preparing a ceramic fiber roll paper flame-retardant sound-absorbing structure.

[0013] To achieve the above objectives, the present invention employs the following technical solution:

[0014] A method for preparing the ceramic fiber roll flame-retardant sound-absorbing structure includes the following steps:

[0015] (1) Cut the ceramic fiber paper into two types of strips: wide ceramic fiber paper strips and narrow ceramic fiber paper strips;

[0016] (2) Attach the narrow ceramic fiber paper strip to the bottom of the wide ceramic fiber paper strip to form a paper strip that is thick on one side and thin on the other;

[0017] (3) Starting from one end, roll the paper tightly with the thicker side of the bottom of the wide ceramic fiber paper strip until the entire paper strip is rolled into a spiral shape, thus obtaining the ceramic fiber paper roll flame retardant and sound-absorbing structure.

[0018] The advantages of this invention are:

[0019] 1. This invention discloses a ceramic fiber roll paper flame-retardant and sound-absorbing structure, which is formed by cross-inserting and rolling two types of ceramic fiber paper strips of different widths. Since the bottom of the two types of paper strips are connected, a slit is formed between every two layers of the upper roll paper. The size of the slit is approximately the same as the width of the bottom paper. When air passes through the slit, the friction between the air and the slit wall converts the sound wave energy into heat. On the other hand, since ceramic fiber itself is a porous material, the vibration of sound waves inside the paper also absorbs the sound wave energy.

[0020] 2. The narrow slit in the middle of the paper allows sound waves to directly enter the interior of the structure, increasing the surface area of ​​contact between the sound waves and the material, thereby further increasing energy loss.

[0021] 3. The structure is made of ceramic fiber paper, which has a low density and excellent lightweight properties compared to metal materials such as aluminum. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0023] Figure 1 This is a schematic diagram of the ceramic fiber roll flame-retardant and sound-absorbing structure of the present invention.

[0024] Figure 2 A cross-sectional view of a single cell;

[0025] Figure 3 This is a diagram of the preparation process;

[0026] Figure 4 This is a schematic diagram of the sound absorption coefficient of the embodiment and comparative example of the ceramic fiber roll flame-retardant sound-absorbing structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the sound absorption coefficient of a 1000℃ spray gun in an embodiment of the ceramic fiber roll flame-retardant sound-absorbing structure of the present invention.

[0028] Among them: 1. Wide ceramic fiber paper strips; 2. Narrow ceramic fiber paper strips. Detailed Implementation

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0032] refer to Figure 1 and Figure 2 This invention provides a ceramic fiber rolled paper flame-retardant sound-absorbing structure, comprising wide ceramic fiber paper strips 1 and narrow ceramic fiber paper strips 2. The wide ceramic fiber paper strips 1 and narrow ceramic fiber paper strips 2 are stacked and rolled into several layers in a spiral shape, with air gaps formed between adjacent wide ceramic fiber paper strips 1 and narrow ceramic fiber paper strips 2. The preparation process is described in [reference needed]. Figure 3 The overlapping and curling of wide ceramic fiber paper strips 1 and fine ceramic fiber paper strips 2 introduces gaps between adjacent sheets above the structure. (See reference...) Figure 2 The curled shape of the structure is related to the processing method. By continuously folding and bending, structures of different shapes can be prepared according to different engineering needs.

[0033] Example

[0034] The paper material used in this example is ceramic fiber paper with a density of 0.226 g / cm³. 3 It has a thickness of 1 mm and a porosity greater than 80%.

[0035] Example structural dimensions: The cell size of the wide ceramic fiber paper strip is 50 mm in height, the narrow ceramic fiber paper strip is 10 mm in width, and the thickness is 1 mm.

[0036] A method for preparing a ceramic fiber roll flame-retardant sound-absorbing structure includes the following steps:

[0037] (1) Cut the ceramic fiber paper into two types of strips: wide ceramic fiber paper strip 1 and narrow ceramic fiber paper strip 2. The width of the narrow ceramic fiber paper strip 2 should be about 10 mm so that they can be stacked more tightly when rolled later.

[0038] (2) Apply a thin layer of glue or tape to the end of the narrow ceramic fiber paper strip 2, overlap this end with the bottom of the wide ceramic fiber paper strip 1, and make them stick together tightly. Repeat this step until all the paper strips are glued into a long strip, forming a paper strip that is thick on one side and thin on the other.

[0039] (3) Pick up the wide ceramic fiber paper strip 1, place one end at the port of the curling machine, set the curling machine to the required diameter, and start curling; if using a handheld curling machine, you can hold the strip tightly in your hand and gradually curl it. After curling a certain distance, you can fix it with glue or tape to prevent the paper strip from loosening.

[0040] (4) Continue to curl until the entire strip of paper is rolled into a spiral shape. Note that you should maintain a constant speed (0.1 m / min-1 m / min) and force (10-50 N) when curling to ensure the appearance and quality of the final product. If a larger size is required, you can combine multiple rolled strips of paper together and then curl them further.

[0041] (5) After the entire curling process is completed, the resulting structure is tightly joined on one side and has an air gap on the other side, which can be finely adjusted to make it present the desired appearance.

[0042] The tightness of the paper roll structure has a certain impact on its sound absorption performance. Here, the tightness of the paper roll structure is described by the following formula: Tightness = (Thickness of ceramic fiber × Total length of ceramic fiber paper) / Bottom volume of the paper roll structure. To ensure structural stability, the tightness of the paper roll structure should be maintained above 90%.

[0043] The control example is a uniform, seamless ceramic fiber roll paper structure with the same thickness as the example. To ensure the objectivity of the comparison, the paper parameters are the same as those of the example.

[0044] Experimental tests were conducted using the above materials and structural dimensions. The sound absorption coefficients of the embodiment and the control example are given below for comparison:

[0045] The sound absorption coefficients of the implemented structure and the control group of uniform, slitless ceramic fiber roll paper were tested in the range of 0 to 6400 Hz.

[0046] Please see Figure 4 The solid black line represents the sound absorption coefficient of the uniform thickness, seamless ceramic fiber roll structure, while the dashed black line represents the sound absorption coefficient of the slit ceramic fiber roll structure. As can be seen from the figure, compared with the uniform thickness, seamless roll structure, the sound absorption structure proposed in this invention has a significant improvement in the range of 0~6400 Hz.

[0047] The specific manifestations are as follows:

[0048] In the embodiment, the sound absorption coefficient of the gapped ceramic fiber roll structure reaches above 0.8 in the 600~6400 Hz range, and the overall average sound absorption coefficient is 0.9. In contrast, the sound absorption coefficient of the seamless roll structure reaches above 0.8 in the 5000~6400 Hz range, and the overall average sound absorption coefficient is 0.7.

[0049] Please see Figure 5 The solid black line represents the sound absorption coefficient of the slotted fiber ceramic structure before high-temperature calcination, while the dashed black line represents the sound absorption coefficient after calcination at 1000 degrees Celsius for one hour. As can be seen from the figure, high-temperature calcination has almost no impact on the structure's sound absorption performance compared to its initial state.

[0050] The results show that, compared with the ceramic fiber roll structure without slits, the sound absorption coefficient of the ceramic fiber roll structure with slits is greatly improved. At the same time, it has high-performance sound absorption performance with low-frequency broadband. In addition, ceramic fiber paper is lightweight and inexpensive, making it an excellent flame-retardant sound absorption structure.

[0051] Based on the above data, the technical effects achieved by this invention are as follows:

[0052] 1. The test results of this invention show that the sound absorption coefficient is above 0.8 in the range of 600~6400 Hz, and the average sound absorption coefficient is above 0.9, which meets the requirements for effective sound absorption in a wide frequency range;

[0053] 2. The material used in the structure proposed in this invention is ceramic fiber paper, which is inexpensive and readily available;

[0054] 3. The sound-absorbing structure proposed in this invention is simple and easy to process;

[0055] 4. The sound-absorbing structure proposed in this invention has excellent fire-retardant properties, and high-temperature burning has almost no effect on the sound-absorbing performance of the structure.

[0056] 5. By changing the structural parameters of the roll paper and the type of paper, the mechanical and acoustic properties of the overall structure can be altered to meet the requirements of different occasions.

[0057] In summary, the ceramic fiber roll flame-retardant sound-absorbing structure of the present invention can be used to manufacture sound-absorbing devices for aircraft, high-speed trains, and civil buildings. Through structural design, it improves the sound energy loss capacity of air and provides a fire-retardant, lightweight sound-absorbing structure, which has a wide range of engineering application prospects.

[0058] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ceramic fiber roll paper flame-retardant sound-absorbing structure, characterized in that: It includes wide ceramic fiber paper strips (1) and narrow ceramic fiber paper strips (2). The wide ceramic fiber paper strips (1) and narrow ceramic fiber paper strips (2) are stacked and rolled into several layers and spirally rolled. An air gap is formed between adjacent wide ceramic fiber paper strips (1) and narrow ceramic fiber paper strips (2). The thickness of the wide ceramic fiber paper strip (1) and the narrow ceramic fiber paper strip (2) is 0.5 ~ 5 mm; The width of the wide ceramic fiber paper strip (1) is 10 ~ 100 mm; The width of the narrow ceramic fiber paper strip (2) is 1 ~ 10 mm.

2. The ceramic fiber roll flame-retardant sound-absorbing structure according to claim 1, characterized in that: The cross-sectional shape of the ceramic fiber roll flame-retardant sound-absorbing structure is circular, triangular, or petal-shaped.

3. The ceramic fiber roll flame-retardant sound-absorbing structure according to claim 1, characterized in that: The density of the wide ceramic fiber paper strip (1) and the narrow ceramic fiber paper strip (2) is 0.226 g / cm³. 3 It has a thickness of 1 mm and a porosity greater than 80%.

4. A method for preparing the ceramic fiber roll flame-retardant sound-absorbing structure according to any one of claims 1 to 3, characterized in that, Includes the following steps: 1) Cut the ceramic fiber paper into two types of strips: wide ceramic fiber paper strips (1) and narrow ceramic fiber paper strips (2); 2) Attach the narrow ceramic fiber paper strip (2) to the bottom of the wide ceramic fiber paper strip (1) to form a paper strip that is thick on one side and thin on the other; 3) Starting from one end, the wide ceramic fiber paper strip (1) is tightly rolled with the thicker side at the bottom until the entire strip is rolled into a spiral shape, thus obtaining the ceramic fiber roll paper flame-retardant sound-absorbing structure. The tightness of the roll paper structure is described by the following formula: Tightness = (thickness of ceramic fiber paper × total length of ceramic fiber paper) / bottom volume of roll structure. The tightness of the roll structure should be maintained above 90%.

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