A paper basin, a preparation method thereof, and a loudspeaker comprising the same

Abstract

This invention provides a paper cone and its preparation method, as well as a loudspeaker containing the same. The raw materials for preparing the paper cone include the following components by weight: 40-70 parts bamboo pulp, 5-10 parts carbon fiber, and 25-50 parts aramid fiber. The aramid fiber is pulped and then mixed with carbon fiber, and the resulting composite is then mixed with bamboo pulp. By using the three fibers in specific amounts for synergistic enhancement and performance complementarity, not only are the advantages of high strength and high modulus of carbon fiber and aramid fiber effectively utilized, but the bonding and interweaving forces between the fibers are also improved. This constructs a microscopic paper cone structure with carbon fiber as the supporting fiber, aramid fiber as the winding fiber, and bamboo pulp as the filling fiber, giving the paper cone high strength, low density, and appropriate internal damping characteristics. This broadens the frequency response range of the loudspeaker, improves the sensitivity of the loudspeaker, suppresses the splitting vibration of the paper cone, and makes the frequency response characteristics of the loudspeaker flatter.

Description

Technical Field

[0001] This invention belongs to the field of loudspeaker technology, specifically relating to a paper cone and its preparation method, and a loudspeaker containing the same. Background Technology

[0002] The paper cone is a key component of a loudspeaker system, and its performance largely determines the loudspeaker's effective frequency range, distortion performance, and sound quality. Traditional paper cones are made from plant fibers, but plant fiber-based cones suffer from insufficient rigidity. Therefore, improving the rigidity and strength of the paper cone is essential for enhancing loudspeaker performance. Currently, adding high-strength, high-modulus fibers to the paper cone is a common method to improve its rigidity.

[0003] CN108978326A discloses a pulp for trumpet drum paper, which is composed of the following raw materials in parts by weight: 40-60 parts wood pulp fiber, 10-25 parts cotton fiber, 10-20 parts natural silk, 4-8 parts wool fiber, 0.1-0.8 parts bulletproof fiber, 0.05-1 part nanocellulose, 1-3 parts special fiber, 0.1-0.5 parts glass fiber, 3-5 parts phenolic resin, 1-3 parts hydroxyethyl cellulose, 1-3 parts flow aid and filter aid, 0.5-1 part dispersant polyethylene oxide, 2-8 parts dye, and 1-5 parts sizing agent. This pulp combines the dispersion and molding characteristics of wood pulp, cotton pulp, and natural silk, and adds high-strength and high-elasticity fibers such as wool fiber, bulletproof fiber, and glass fiber, giving the drum paper advantages such as high strength, high flexibility, and good elasticity. However, the bulletproof fibers and glass fibers in this pulp have smooth surfaces, few chemically active groups, and strong hydrophobicity. When they are compounded with plant fibers for papermaking, the bonding force between the fibers is weak, resulting in a loose paper structure and an unsatisfactory reinforcing effect on the paperboard.

[0004] CN111629317A discloses a mahogany composite diaphragm, comprising the following raw materials by weight: 20-25 parts cotton pulp, 15-20 parts Manila hemp, 10-15 parts straw pulp, 5-10 parts bulletproof fiber, and 50-60 parts mahogany. By compounding mahogany, Manila hemp, cotton pulp, straw pulp, and bulletproof fiber, the mahogany composite diaphragm exhibits good rigidity, high specific curvature, and low density. However, the bulletproof fiber is directly added to the plant fiber pulp, and it cannot effectively bond with the plant fibers, resulting in minimal improvement in the rigidity of the paper cone diaphragm.

[0005] CN115734129A discloses a paper basin containing carbon fiber and its preparation method. The raw materials of the paper basin include, by weight, 30-50 parts of bleached sulfate wood pulp, 10-30 parts of Manila hemp pulp, 10-30 parts of cotton pulp, 10-30 parts of carbon fiber, and 5-30 parts of polyvinyl alcohol (PVA) fiber. Among them, PVA is added to the pulp in fibrous form, which increases the upper limit of the amount of carbon fiber added in the paper basin pulp, raising the maximum amount of carbon fiber added to 30%. However, when preparing paper basins with a large thickness, the temperature of the hot pressing mold cannot be effectively transferred to the inside of the paper basin, resulting in the PVA fiber distributed inside the paper basin not being completely melted. The PVA fiber cannot play the role of enhancing the bonding force between carbon fiber and plant fiber, resulting in insufficient bonding force between carbon fiber and plant fiber, loose paper basin structure, and low strength.

[0006] Studies have shown that the strength of a paper cone is affected by both fiber strength and interfiber bonding. Although there are existing technologies that add reinforcing fibers to plant fibers to improve the rigidity of the paper cone, the surface of the reinforcing fibers is smooth and there are almost no functional groups, resulting in a weak bonding between the reinforcing fibers and plant fibers. The amount of reinforcing fibers added cannot be too high. Moreover, the internal structure of the paper cone is loose, and the reinforcing effect is not obvious. At present, the rigidity and strength of the paper cone still cannot meet the performance requirements of high-performance loudspeakers.

[0007] Therefore, developing paper cones with high strength and rigidity, as well as low density and suitable internal damping, to obtain loudspeakers with better performance is a key research focus in this field. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a paper cone and its preparation method, as well as a loudspeaker containing the same. Through the design and synergy of bamboo pulp, carbon fiber, and aramid fiber, the three fibers exhibit excellent bonding and interweaving forces, resulting in a paper cone with high strength, low density, and appropriate internal damping. When applied to a loudspeaker, the paper cone can expand the frequency response range of the loudspeaker, improve its sensitivity, suppress high-frequency breakup vibrations, and make the frequency response curve of the loudspeaker smoother.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides a paper basin, wherein the raw materials for preparing the paper basin comprise the following components in parts by weight:

[0011] 40-70 parts bamboo pulp

[0012] 5-10 parts carbon fiber

[0013] 25-50 parts of aramid fiber;

[0014] The aramid fiber is pulped and then mixed with carbon fiber. The resulting composite is then mixed with bamboo pulp.

[0015] This invention, based on extensive research, has found that while carbon fiber possesses advantages such as high strength and high modulus, its smooth surface lacks functional groups, preventing it from forming hydrogen bonds with plant fibers. This weak bonding between carbon and plant fibers limits the amount of carbon fiber added to paper cones and results in a loose internal structure, leading to insufficient paper cone strength. Furthermore, carbon fiber's brittleness and difficulty in bending and fibrillation within the paper cone further weaken the interweaving force between carbon and plant fibers. Aramid fibers, while possessing good mechanical properties, have a smooth surface, few chemically active groups, and strong hydrophobicity. When aramid and plant fibers are blended for papermaking, the weak bonding between the two fibers results in a loose internal paper structure and insufficient paper cone strength.

[0016] Based on the aforementioned research results, the paper cone provided by this invention uses a specific amount of bamboo pulp, carbon fiber, and aramid fiber in a compound. The aramid fiber is not added directly, but rather after pulping. This process maintains the same length of the treated aramid fiber, but results in a large number of fluffy microfibers on the surface of the fiber backbone, significantly increasing the degree of fibrillation and improving the interlacing points between the aramid fiber and the plant fibers in the carbon fiber and bamboo pulp. This invention uses specific amounts of the three fibers for synergistic enhancement and performance complementarity, effectively leveraging the high strength and high modulus advantages of carbon fiber and aramid fiber, while also improving the bonding and interlacing forces among the three fibers. This constructs a microscopic paper cone structure with carbon fiber as the supporting fiber, aramid fiber as the winding fiber, and bamboo pulp as the filling fiber. This endows the paper cone with high strength, low density, and appropriate internal damping, thereby widening the frequency response range of the loudspeaker, improving its sensitivity, suppressing the cone's segmentation vibration, and making the loudspeaker's frequency response characteristics flatter.

[0017] In the raw materials for preparing the paper basin provided by the present invention, the bamboo pulp has a mass fraction of 40-70 parts, for example, 42 parts, 45 parts, 48 ​​parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts or 68 parts, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0018] The carbon fiber has a mass fraction of 5-10 parts, for example, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts or 9.5 parts, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0019] The aramid fiber has a mass fraction of 25-50 parts, for example, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts or 48 parts, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0020] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0021] Preferably, the average fiber length of the bamboo pulp is 1.5-2.0 mm, for example, it can be 1.55 mm, 1.6 mm, 1.65 mm, 1.7 mm, 1.75 mm, 1.8 mm, 1.85 mm, 1.9 mm or 1.95 mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range, but 1.55-1.93 mm is further preferred.

[0022] It should be noted that the average fiber length of the bamboo pulp is the average fiber length after pulping.

[0023] Preferably, the average length of the carbon fiber is 4-7 mm, for example, it can be 4.2 mm, 4.5 mm, 4.8 mm, 5 mm, 5.2 mm, 5.5 mm, 5.8 mm, 6 mm, 6.2 mm, 6.5 mm or 6.8 mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0024] Preferably, the tensile strength of the carbon fiber is 2500-4500 MPa, for example, it can be 2800 MPa, 3000 MPa, 3500 MPa, 3500 MPa, 3800 MPa, 4000 MPa, 4200 MPa or 4400 MPa, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0025] Preferably, the elastic modulus of the carbon fiber is 200-300 GPa, for example, it can be 210 GPa, 220 GPa, 230 GPa, 240 GPa, 250 GPa, 260 GPa, 270 GPa, 280 GPa or 290 GPa, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0026] Preferably, the elongation at break of the carbon fiber is 1.3%-1.9%, for example, it can be 1.4%, 1.5%, 1.6%, 1.7% or 1.8%, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0027] Preferably, the density of the carbon fiber is 1.5-2.0 g / cm³. 3 For example, it can be 1.55 g / cm³. 3 1.6g / cm 3 1.7g / cm 3 1.8g / cm 3 Or 1.9g / cm 3 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific point values ​​included in the range.

[0028] As a preferred embodiment of the present invention, the carbon fiber has a tensile strength of 3000 MPa, an elastic modulus of 225 GPa, an elongation at break of 1.7%, and a density of 1.7 g / cm³. 3 With an average length of 4-7mm, it has high strength and high modulus. As a supporting fiber, it can effectively improve the strength and modulus of the paper cone.

[0029] Preferably, the tensile strength of the aramid fiber is 2500-3500 MPa, for example, it can be 2600 MPa, 2800 MPa, 3000 MPa, 3100 MPa, 3200 MPa, 3300 MPa or 3400 MPa, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0030] Preferably, the elastic modulus of the aramid fiber is 100-150 GPa, for example, it can be 105 GPa, 110 GPa, 115 GPa, 120 GPa, 125 GPa, 130 GPa, 135 GPa, 140 GPa or 145 GPa, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0031] Preferably, the elongation at break of the aramid fiber is 2.0%-3.0%, for example, it can be 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0032] Preferably, the density of the aramid fiber is 1.38-1.45 g / cm³. 3 For example, it can be 1.39 g / cm³. 3 1.4g / cm 3 1.41 g / cm 3 1.42g / cm 3 1.43 g / cm 3 Or 1.44 g / cm 3 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific point values ​​included in the range.

[0033] As a preferred embodiment of the present invention, the aramid fiber has a tensile strength of 2815 MPa, an elastic modulus of 126 GPa, an elongation at break of 2.5%, and a density of 1.44 g / cm³. 3 Compared to carbon fiber, carbon fiber has advantages in mechanical properties, while aramid fiber has a greater elongation and lower density.

[0034] Preferably, the average length of the aramid fiber is 5.5-6.5 mm, for example, it can be 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6 mm, 6.1 mm, 6.2 mm, 6.3 mm or 6.4 mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0035] Preferably, the freeness of the aramid fiber after pulping is 15-40°SR, for example, it can be 16°SR, 18°SR, 20°SR, 22°SR, 25°SR, 28°SR, 30°SR, 32°SR, 35°SR or 38°SR, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0036] As a preferred technical solution of the present invention, the aramid fiber after pulping has a freeness of 15-40°SR and an average length of 5.5-6.5mm, which keeps the aramid fiber at a relatively long length. At the same time, there are a large number of fluffy microfibers on the surface of the fiber trunk, and the degree of fibrillation is significantly improved, thereby increasing the interlacing points and bonding force of the aramid fiber and other fibers, making it a winding fiber and improving the strength and modulus of the paper cone.

[0037] Preferably, the mass ratio of carbon fiber to aramid fiber is 1:(4-6), for example, it can be 1:4.2, 1:4.5, 1:4.8, 1:5, 1:5.2, 1:5.5 or 1:5.8, etc.

[0038] As a preferred embodiment of the present invention, the mass ratio of carbon fiber to aramid fiber is 1:(4-6). Both fibers, acting as reinforcing fibers, synergistically enhance each other, constructing a specific microstructure with carbon fiber as the supporting fiber, aramid fiber as the winding fiber, and bamboo pulp as the filling fiber. This results in a paper cone exhibiting high strength, high modulus, low density, and suitable internal damping characteristics. If the ratio of carbon fiber to aramid fiber exceeds the preferred range, it will affect the balance between strength, density, and internal damping properties of the paper cone, particularly leading to a reduction in strength.

[0039] In a second aspect, the present invention provides a method for preparing a paper basin as described in the first aspect, the method comprising:

[0040] Bamboo pulp is pulped to obtain component A;

[0041] Aramid fibers were dispersed in water and pulped to obtain component B;

[0042] Component B is first mixed with carbon fiber and dispersed evenly to obtain component C;

[0043] After mixing and filtering, component A and component C are obtained as a wet paper basin blank.

[0044] The paper basin wet blank is hot-pressed to obtain a paper basin blank;

[0045] The paper basin blank is punched to obtain the paper basin.

[0046] In the paper basin preparation method provided by the present invention, bamboo pulp and aramid fiber are first pulped separately. Then, component B obtained by pulping aramid fiber is fully mixed with carbon fiber until the carbon fiber is wrapped and wound by aramid fiber to obtain component C. Component C is then mixed with component A obtained by pulping bamboo pulp to construct a microstructure with carbon fiber as the supporting fiber, aramid fiber as the winding fiber, and bamboo pulp as the filling fiber. Then, the paper basin is obtained by filtration, hot pressing and punching.

[0047] Preferably, the pulp consistency of the bamboo pulp after pulping is 1.1%-1.8%, for example, it can be 1.15%, 1.2%, 1.25%, 1.3%, 1.35%, 1.4%, 1.45%, 1.5%, 1.55%, 1.6%, 1.65%, 1.7%, or 1.75%, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range, but 1.5%-1.6% is further preferred.

[0048] Preferably, the degree of solubility of component A is 20-26°SR, for example, it can be 21°SR, 22°SR, 23°SR, 24°SR or 25°SR, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0049] As a preferred technical solution of the present invention, the bamboo pulp is subjected to pulping treatment to obtain component A with a beating degree of 20-26°SR and an average fiber length of 1.5-2.0mm, so that the bamboo pulp can better play a filling role.

[0050] Preferably, the mass ratio of the aramid fiber to water is 1:(230-300), for example, it can be 1:235, 1:240, 1:245, 1:250, 1:255, 1:260, 1:265, 1:270, 1:275, 1:280, 1:285, 1:290 or 1:295, etc.

[0051] Preferably, the aramid fibers are pulped using a trough pulper.

[0052] Preferably, during the pulping process of the aramid fiber dispersed in water, the gap between the flying knife and the bottom knife is 0.1-0.3 mm, for example, it can be 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm or 0.28 mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0053] Preferably, the aramid fiber is dispersed in water and pulped for 4-10 hours, for example, 4.5 hours, 5 hours, 5.5 hours, 6 hours, 6.5 hours, 7 hours, 7.5 hours, 8 hours, 8.5 hours, 9 hours or 9.5 hours, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0054] Preferably, the degree of solubility of component B is 15-40°SR, for example, it can be 16°SR, 18°SR, 20°SR, 22°SR, 25°SR, 28°SR, 30°SR, 32°SR, 35°SR or 38°SR, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0055] As a preferred technical solution of the present invention, a specific beating process is used to beating aramid fibers. By controlling the mass ratio of aramid fibers to water to be 1:(230-300) and controlling the gap between the fly knife and the bottom knife to be 0.1-0.3mm, the fly knife and the bottom knife do not have a shearing effect on the aramid fibers during the beating process. Relying on the mutual friction between the aramid fibers, the highly oriented skin layer of the aramid fibers is detached, and the microfibers of the core layer are extracted, forming fluffy filaments that coil around the main shaft. This results in a large number of fluffy microfibers being split on the surface of the aramid fibers, maximizing the degree of aramid fiber splitting and obtaining component B with a freeness (ratio of beating) of 15-40°SR. This increases the interlacing points and bonding force between the aramid fibers and other fibers, thereby improving the strength of the paperboard.

[0056] Preferably, the first mixture further includes water and a dispersant.

[0057] Preferably, the dispersant comprises polyethylene glycol.

[0058] Preferably, based on the total mass of the aramid fiber (ocean dry weight of component B) and carbon fiber as 100%, the mass of the dispersant is 50-120%, for example, it can be 60%, 70%, 80%, 90%, 100%, 110% or 115%, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0059] As a preferred technical solution of the present invention, in the first mixing, component B and carbon fiber are dispersed in water, polyethylene glycol is added to improve the dispersibility of aramid fiber and carbon fiber in component B, and the mixture is stirred thoroughly and evenly so that the carbon fiber is wrapped and entangled by the pulped aramid fiber in component B to form a composite (component C); the composite is then mixed with bamboo pulp to construct a paper basin structure with carbon fiber as the supporting fiber, aramid fiber as the winding fiber, and bamboo pulp as the filling fiber.

[0060] Preferably, the method for preparing the paper basin wet preform specifically includes: mixing component A and component C, diluting with water, and filtering to obtain the paper basin wet preform.

[0061] Preferably, the hot pressing method specifically includes: placing the wet paper basin blank in a high-temperature mold, pressing and drying it to obtain a paper basin blank.

[0062] Preferably, the hot pressing temperature is 150-200℃, for example, it can be 155℃, 160℃, 165℃, 170℃, 175℃, 180℃, 185℃, 190℃ or 195℃, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0063] Preferably, the punching method specifically includes: using a punching die to remove the central hole and edge material of the paper basin blank to obtain the paper basin.

[0064] Preferably, the preparation method specifically includes:

[0065] Bamboo pulp was dispersed in water and pulped to obtain component A with a beating degree of 20-26°SR;

[0066] Aramid fibers are dispersed in water and pulped, wherein the mass ratio of aramid fibers to water is 1:(230-300), the gap between the flying knife and the bottom knife is 0.1-0.3 mm, and pulping is carried out for 4-10 hours to obtain component B with a freeness of 15-40°SR.

[0067] Component B and carbon fiber were dispersed in water, and polyethylene glycol was added as a dispersant. The dispersion was uniform to obtain component C.

[0068] Component A and component C are mixed, diluted with water, and filtered to obtain a wet paper basin blank.

[0069] The wet paper basin blank is placed in a high-temperature mold and hot-pressed at 150-200℃ to obtain a paper basin blank.

[0070] The paper basin blank is punched using a punching die to remove the central hole and edge material, thereby obtaining the paper basin.

[0071] Thirdly, the present invention provides a loudspeaker comprising a paper cone as described in the first aspect.

[0072] Compared with the prior art, the present invention has the following beneficial effects:

[0073] (1) The paper cone provided by this invention uses a specific amount of bamboo pulp, carbon fiber, and aramid fiber to form a compound. The aramid fiber is pulped to maintain its length, while the surface of the fiber trunk has a large number of fluffy microfibers, significantly improving the degree of fibrillation. This is beneficial for increasing the interlacing points of the aramid fiber, carbon fiber, and plant fibers in the bamboo pulp. This invention uses a specific amount of the three fibers to synergistically enhance / complement their performance. It not only effectively utilizes the advantages of high strength and high modulus of carbon fiber and aramid fiber, but also improves the bonding and interlacing forces between the three fibers. This constructs a microscopic paper cone structure with carbon fiber as the supporting fiber, aramid fiber as the winding fiber, and bamboo pulp as the filling fiber. This gives the paper cone high strength, low density, and appropriate internal damping, thereby widening the frequency response range of the loudspeaker, improving the sensitivity of the loudspeaker, suppressing the splitting vibration of the paper cone, and making the frequency response characteristics of the loudspeaker flatter.

[0074] (2) Through the design of components and optimization of the preparation process, this invention achieves a Young's modulus of 5.5-7.8 GPa and a density of 0.43-0.62 g / cm³ for the paper basin. 3 With a loss factor of 0.049-0.077, it combines high strength and high modulus, low density, appropriate internal damping and high stability, enabling loudspeakers containing it to have higher high-frequency cutoff frequencies and smoother frequency response curves. Attached Figure Description

[0075] Figure 1 The frequency response curve test diagrams of the paper cone used for loudspeakers provided in Embodiments 1, 3, and 4 of the present invention are shown. Detailed Implementation

[0076] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0077] The terms “comprising,” “including,” “having,” “containing,” or any other variations thereof, as used herein, are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not limited to those elements and may also include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0078] The specific information of the materials used in the following specific embodiments of the present invention is as follows:

[0079] (1) Bamboo pulp: purchased from Guangzhou Yunqi Electroacoustic Technology Development Co., Ltd.

[0080] (2) Carbon fiber: Short-cut carbon fiber with an average length of 6mm, purchased from Guangzhou Yunqi Electroacoustic Technology Development Co., Ltd.

[0081] (3) Aramid fiber: Para-aramid fiber with an average length of 6mm, purchased from Guangzhou Yunqi Electroacoustic Technology Development Co., Ltd.

[0082] (4) Polyethylene glycol: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0083] Example 1

[0084] A paper basin and its preparation method, wherein the raw materials for preparing the paper basin include the following components in parts by weight:

[0085] 64 portions of bamboo pulp

[0086] 6 parts carbon fiber

[0087] 30 parts of aramid fiber;

[0088] The method for preparing the paper basin specifically includes the following steps:

[0089] (1) Disperse bamboo pulp in water and beat it with a trough pulper. The pulp concentration is 1.57%, and component A with a beating degree of 25°SR is obtained.

[0090] Aramid fibers were dispersed in water at a mass ratio of 1:280. The mixture was pulped using a trough beater with a gap of 0.2 mm between the fly knife and the bottom knife. After 8 hours of pulping, component B with a freeness of 40°SR was obtained.

[0091] Component B and carbon fiber are dispersed in water, and polyethylene glycol (based on the total mass of component B and carbon fiber being 100%, the amount of polyethylene glycol added is 100%) is added as a dispersant. The mixture is stirred and dispersed evenly to obtain component C.

[0092] (2) Mix component A and component C obtained in step (1), dilute with water, filter, and obtain paper basin wet embryo;

[0093] (3) The paper basin wet blank is placed in a high-temperature mold for hot pressing and molding, and the temperature is controlled at 185°C. After pressing and drying, a paper basin blank is obtained.

[0094] (4) The paper basin blank obtained in step (3) is punched using a punching die to remove the central hole and edge material, thereby obtaining the paper basin.

[0095] Examples 2-8, Comparative Examples 1-6

[0096] A paper basin differs from Example 1 only in the amount of components and / or degree of solubility, as shown in Table 1, where "--" indicates that the component was not added; the preparation method of the paper basin is the same as that of Example 1.

[0097] Table 1

[0098]

[0099]

[0100] Comparative Example 7

[0101] A paper basin, which differs from Example 1 only in that the bamboo pulp is replaced with an equal mass of cotton pulp (purchased from Guangzhou Yunqi Electroacoustic Technology Development Co., Ltd.), while the other components, dosages and preparation methods are the same as in Example 1.

[0102] Comparative Example 8

[0103] A paper basin, which differs from Example 1 only in that carbon fiber is replaced with glass fiber of equal mass (average length 6 mm, purchased from Shenzhen Teli New Material Technology Co., Ltd.), while the other components, dosages and preparation methods are the same as in Example 1.

[0104] Comparative Example 9

[0105] A paper basin differs from Example 1 only in that the aramid fiber is not pulped. Instead, the aramid fiber, carbon fiber, polyethylene glycol, and component A (with a freeness of 25°SR) are directly mixed, diluted with water, and filtered to obtain a wet paper basin preform. The components and other preparation steps are the same as in Example 1.

[0106] Comparative Example 10

[0107] A paper basin, which differs from Example 1 only in that, when the aramid fibers are pulped, the gap between the flying knife and the bottom knife of the trough pulper is 0 mm, and the pulping is carried out for 8 hours to obtain component B with a freeness of 40°SR; the components and other preparation steps are the same as in Example 1.

[0108] Comparative Example 11

[0109] A paper basin differs from Example 1 only in that component C is not prepared in step (1), and components A, B, carbon fiber and polyethylene glycol are directly mixed, diluted with water, filtered, and a wet paper basin preform is obtained; the components, dosage and other preparation steps are the same as in Example 1.

[0110] The paper basins provided in Examples 1-8 and Comparative Examples 1-11 were subjected to performance tests, and the methods are as follows:

[0111] (1) Density: The mass / volume method was used. The mass of the paper basin was measured by an electronic balance, the thickness of the paper basin was measured by a micrometer, and the volume of the paper basin was calculated by a 3D model of the paper basin.

[0112] (2) Young's modulus: The Young's modulus of the paper cone was tested using the Material Parameter Testing Module (MPM) in KLIPPEL R&D SYSTEM to characterize its strength;

[0113] (3) Loss factor: The loss factor of the paper cone was tested using the Material Parameter Test Module (MPM) in KLIPPEL R&D SYSTEM to characterize its damping.

[0114] The test results for density, Young's modulus, and loss factor are shown in Table 2.

[0115] (4) Testing of the speaker frequency response curve: A speaker with the paper cone to be tested was assembled. The speaker was a 6.5-inch woofer. The voice coil was placed in the magnetic circuit system and connected to the paper cone. When an alternating audio current was applied to the voice coil, the voice coil was subjected to electromagnetic force in the magnetic field, causing piston vibration, which drove the paper cone to vibrate the air, thereby producing sound. The frequency response curve of the speaker was tested in an anechoic chamber using a Soundcheck testing system. A 1W sine wave signal was input to the speaker, and the sound emitted by the speaker was received at 1m using a microphone. The frequency response curve of the speaker at 1m and 1W was obtained through comprehensive calculation by a computer. The frequency response curve test diagrams of the paper cones used for speakers provided in Examples 1, 3, and 4 are shown in the figure below. Figure 1 As shown.

[0116] Table 2

[0117]

[0118]

[0119] As shown in Table 2, the test data of this invention utilizes specific amounts of bamboo pulp, carbon fiber, and aramid fiber in a compound formulation. The aramid fiber undergoes pulping treatment. The three fibers, used in specific amounts, synergistically enhance each other's performance and complement each other, working in conjunction with a specific preparation method. This results in the paper basins provided in Examples 1-6 having a Young's modulus of 5.5-7.8 GPa and a density of 0.43-0.62 g / cm³. 3 With a loss factor of 0.049-0.077, the paper cone is endowed with high strength, low density, and appropriate internal damping, which effectively widens the frequency response range of the loudspeaker, improves the sensitivity of the loudspeaker, suppresses the splitting vibration of the paper cone, and makes the frequency response characteristics of the loudspeaker flatter.

[0120] In this invention, through the design and optimization of the ratio of carbon fiber to aramid fiber, the preferred mass ratio is 1:(4-6). Both fibers, acting as reinforcing fibers, synergistically enhance each other, constructing a specific microstructure with carbon fiber as the supporting fiber, aramid fiber as the winding fiber, and bamboo pulp as the filling fiber. This effectively improves the strength and modulus of the paper cone, maintaining an excellent balance between low density, high strength, and suitable internal damping. A comparison of Examples 1 and 7-8 shows that when the mass ratio of carbon fiber to aramid fiber is too large or too small, the paper cone cannot simultaneously achieve the beneficial effects of high modulus, low density, and appropriate internal damping.

[0121] The paper basin provided by this invention uses a specific amount of bamboo pulp, carbon fiber, and aramid fiber to form a composite. The fibers work synergistically / complement each other and are combined with a specific preparation method (including pulping method, beating degree, component compounding process steps, etc.) to construct a microstructure with carbon fiber as the supporting fiber, aramid fiber as the winding fiber, and bamboo pulp as the filling fiber. This results in a paper basin with high strength and Young's modulus, low density, and suitable internal damping characteristics.

[0122] As can be seen from the comparison between Example 1 and Comparative Example 1, when the beating degree of bamboo pulp (component A) is too small, the bamboo pulp cannot play a "filling" role, resulting in a decrease in the Young's modulus of the paper cone; as can be seen from the comparison between Example 1 and Comparative Example 2, when the beating degree of bamboo pulp is too large, the filling effect of bamboo pulp is too strong, resulting in a higher density of the paper cone.

[0123] As can be seen from Comparative Examples 3 and 4, if either carbon fiber or aramid fiber is missing from the raw materials for preparing paper cones, that is, carbon fiber and aramid fiber do not have a synergistic effect, the paper cones cannot simultaneously achieve the effects of high strength, low density, and appropriate internal damping, especially with a significant reduction in strength and modulus.

[0124] In Comparative Example 5, the amount of carbon fiber and aramid fiber added was too much, and the amount of bamboo pulp added was too little. At this time, the hydrogen bonding between the paper cone fibers was too weak, the paper cone could not be formed, and subsequent performance tests could not be carried out.

[0125] As can be seen from the comparison between Example 1 and Comparative Example 6, when the amount of carbon fiber and aramid fiber added is too low and the amount of bamboo pulp is too high, the Young's modulus of the paper cone decreases and the density increases.

[0126] As can be seen from the comparison between Example 1 and Comparative Example 7, when cotton pulp of the same mass and the same degree of beating is used to replace bamboo pulp, the length of the cotton pulp fibers is too long and cannot play a filling role, resulting in a decrease in the Young's modulus and strength of the paper basin.

[0127] As can be seen from the comparison between Example 1 and Comparative Example 8, if glass fiber of the same mass is used to replace carbon fiber, the strength of glass fiber is less than that of carbon fiber, and the specific gravity is greater than that of carbon fiber, resulting in a decrease in the Young's modulus and strength of the paper cone and an increase in density.

[0128] As can be seen from the comparison between Example 1 and Comparative Example 9, if aramid fibers are directly added to the pulp used to prepare paper cones, the bonding force between the fibers is poor, resulting in a decrease in the Young's modulus of the paper cones; and there are no fluffy filaments in the paper cones, resulting in a decrease in the loss factor of the paper cones.

[0129] As can be seen from the comparison between Example 1 and Comparative Example 10, when aramid fibers are pulped, the gap between the flying knife and the bottom knife of the trough pulper is reduced to 0mm. At this time, the aramid fibers are cut off, the fiber separation effect is poor, and it cannot play the role of wrapping and winding, resulting in a decrease in the Young's modulus of the paper tray and a decrease in the loss factor.

[0130] As can be seen from the comparison between Example 1 and Comparative Example 11, directly mixing component A, component B and carbon fiber and dispersing them in water does not allow for the construction of a paper basin structure with carbon fiber as the supporting fiber, aramid fiber as the winding fiber and bamboo pulp as the filling fiber, resulting in a decrease in the Young's modulus and an increase in the density of the paper basin.

[0131] Depend on Figure 1 It can be seen that when the paper cones provided in Examples 1 and 3 are applied to loudspeakers, the loudspeakers have a higher high-frequency cutoff frequency and a smoother frequency response curve. The paper cones provided in Comparative Example 4 have poor modulus / strength and loss factor. Therefore, when applied to loudspeakers, the high-frequency cutoff frequency of the loudspeakers is shifted forward, and the frequency response curve of the loudspeakers has more peaks and valleys in the high-frequency range, resulting in a decrease in the smoothness of the frequency response curve.

[0132] The applicant declares that the present invention is illustrated through the above embodiments with respect to the paper basin and its preparation method, and the speaker containing the same. However, the present invention is not limited to the above process steps, that is, it does not mean that the present invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials used in the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A paper tub, characterized in that, The raw materials for preparing the paper basin include the following components in parts by weight: 40-70 parts bamboo pulp 5-10 parts carbon fiber 25-50 parts of aramid fiber; The aramid fiber is pulped and then mixed with carbon fiber, and the resulting composite is then mixed with bamboo pulp. The average fiber length of the bamboo pulp is 1.5-2.0 mm; The average length of the carbon fiber is 4-7 mm; The average length of the aramid fiber is 5.5-6.5 mm; The freeness of the aramid fiber after pulping is 15-40°SR. The mass ratio of carbon fiber to aramid fiber is 1:(4-6).

2. A method of making a paper tub as claimed in claim 1, characterised in that, The preparation method includes: Bamboo pulp is pulped to obtain component A; Aramid fibers were dispersed in water and pulped to obtain component B; Component B is first mixed with carbon fiber and dispersed evenly to obtain component C; After mixing and filtering, component A and component C are obtained as a wet paper basin blank. The paper basin wet blank is hot-pressed to obtain a paper basin blank; The paper basin blank is punched to obtain the paper basin.

3. The preparation method according to claim 2, characterized in that, The degree of solubility of component A is 20-26°SR.

4. The preparation method according to claim 2, characterized in that, The mass ratio of the aramid fiber to water is 1:(230-300).

5. The preparation method according to claim 2, characterized in that, During the pulping process of the aramid fibers dispersed in water, the gap between the flying knife and the bottom knife is 0.1-0.3 mm.

6. The preparation method according to claim 2, characterized in that, The aramid fibers are dispersed in water and pulped for 4-10 hours.

7. The preparation method according to claim 2, characterized in that, The degree of solubility of component B is 15-40°SR.

8. The preparation method according to claim 2, characterized in that, The first mixture also includes water and a dispersant.

9. The production method according to claim 8, characterized by, The dispersant includes polyethylene glycol.

10. The preparation method according to claim 8, characterized in that, With the total mass of the aramid fiber and carbon fiber being 100%, the mass of the dispersant is 50-120%.

11. The preparation method according to claim 2, characterized in that, The method for preparing the paper basin wet preform specifically includes: mixing component A and component C, diluting with water, and filtering to obtain the paper basin wet preform.

12. The preparation method according to claim 2, characterized in that, The hot pressing method specifically includes: placing the wet paper basin blank in a high-temperature mold, pressing and drying it to obtain a paper basin blank.

13. The preparation method according to claim 2, characterized in that, The hot pressing temperature is 150-200℃.

14. The method of claim 2, wherein, The punching method specifically includes: using a punching die to remove the central hole and edge material of the paper basin blank to obtain the paper basin.

15. A loudspeaker, characterized by The speaker comprises the paper cone as described in claim 1.

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