Paper cone and preparation method thereof, and loudspeaker comprising paper cone

Abstract

The invention provides a cone, a preparation method thereof and a loudspeaker comprising the cone. The cone is prepared from, by mass, 60-90 parts of low-beating-degree bagasse pulp, 2-30 parts of high-beating-degree bagasse pulp and 5-20 parts of original ecological fibers. The beating degree of the low-beating-degree bagasse pulp is smaller than 30 degrees SR, and the beating degree of the high-beating-degree bagasse pulp is larger than 60 degrees SR. Through the design and mutual compounding of the components, the cone has high strength and high modulus, and obtains excellent mechanical properties and acoustic characteristics. Moreover, the paper cone takes bagasse pulp as a main raw material, so that the value of agricultural wastes is fully exerted, the cyclic utilization of resources is promoted, and both environmental protection and cost effectiveness are taken into account. According to the loudspeaker comprising the cone, the medium-high frequency band is obviously improved, the warm feeling and the natural feeling of timbre are increased, the sound is fuller and clearer, and the dual requirements of the market on the timbre and the performance are met.

Description

Technical Field

[0001] The invention belongs to the technical field of paper cones and loudspeakers, and in particular relates to a paper cone and a preparation method thereof, and a loudspeaker comprising the same. Background Art

[0002] With the advancement of technology and the improvement of people's living standards, consumers' requirements for audio equipment are not limited to basic functionality, but they pay more attention to the performance of product sound quality and the aesthetic appearance. As a key component for sound production, the material and design of the speaker cone directly affect the sound quality and the overall appeal of the product. Traditional speaker cones are mostly made of wood pulp fibers, and some non-wood pulp fibers (such as cotton pulp, hemp pulp, bamboo pulp, straw pulp, etc.) are added to improve the comprehensive performance of the cone. Although this material can meet the basic sound quality requirements to a certain extent, it seems to be unable to meet the needs in the high-end market.

[0003] In order to improve the sound quality, some researchers have proposed to improve the acoustic performance of paper basins by adding natural wood fibers. Natural wood fibers refer to raw fibers that have not been pulped. They are directly extracted from plants without chemical treatment or processing. The main chemical composition of natural wood fibers is cellulose, hemicellulose and lignin, with a small amount of pectin, wax and inorganic substances. They retain the natural characteristics of plant raw materials. There are tiny gaps and holes inside the wood. This hollow structure and porosity help to improve the resonance effect of the sound and enhance the sound quality while maintaining low density and high specific strength. However, since natural fibers are not pulped and have large morphological differences, direct addition will lead to uneven dispersion and affect performance; in addition, due to the complex surface composition of natural fibers, it will also affect the combination with pulp fibers, thereby affecting the overall strength performance. CN116887150A discloses a speaker paper cone and its preparation method and application. The preparation raw materials include 20-70 parts of bleached sulfate wood pulp, 5-40 parts of bark pulp, 5-40 parts of hemp pulp, 2-50 parts of bamboo fiber, and 0.1-3 parts of chitosan. Bamboo fiber is introduced into the paper cone, and the bamboo fiber is pulped to improve the dispersion, so that the Young's modulus of the obtained speaker paper cone is increased, the density is small, and the frequency response range of the speaker is widened. However, the pulping process increases the production time and cost, and the pulping will change the microstructure of the bamboo fiber, resulting in fiber cutting, which will damage the original middle cavity structure to a certain extent, affect the sound quality performance of the speaker, and it is difficult to balance the requirements of strength, modulus and sound quality.

[0004] In addition, with the emphasis on energy conservation and emission reduction in recent years, wood pulp fiber materials are facing more and more challenges in resource utilization and environmental protection. Finding renewable and environmentally friendly alternative materials has become an important issue in the industry. Therefore, the application of non-wood pulp fiber raw materials in speaker cones has received widespread attention. Bagasse is the fiber residue of sugarcane stems left after sugarcane is crushed and squeezed to extract sugarcane juice. Its content accounts for 24%-27% of sugarcane and is one of the largest agricultural wastes in the world. The fiber morphology of bagasse is close to that of wood fiber. Compared with other agricultural crop industrial residues, bagasse has a lower ash content, generally less than 2.0%. Bagasse fiber raw materials are mainly composed of cellulose, hemicellulose and lignin, among which cellulose constitutes the mesh skeleton of the fiber cell wall, and hemicellulose and lignin are "binders and fillers" filled between fibers and microfibers. The mass of cellulose, hemicellulose and lignin in bagasse fiber accounts for approximately 32-45%, 20-35% and 20-30% of the total raw material, respectively. After the pulping process, bagasse pulp is made into a pulp board, and the mass proportions of cellulose, hemicellulose and lignin in the pulp board are approximately 70-85%, 10-20% and 1-6% respectively. Compared with other agricultural wastes, bagasse, as a by-product of the sugar industry, has the characteristics of concentrated sources, simple collection, small transportation radius, relatively stable composition, uniform properties and low cost. At present, most research focuses on the use of bagasse pulp for household paper or paper lunch boxes. Its application in the field of speaker cones is still very limited. Direct application of it in the manufacture of cones generally faces problems such as insufficient strength and poor acoustic performance.

[0005] Therefore, how to choose a suitable pulp system to solve the problem of adding natural wood fiber and obtain speaker cone materials with good mechanical properties and acoustic properties while taking into account environmental protection and cost-effectiveness is of great significance to promoting the sustainable development of the speaker industry. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a paper cone and a method for preparing the same, and a loudspeaker comprising the same. Through the design and mutual compounding of low-beatenness bagasse pulp, high-beatenness bagasse pulp and original ecological fiber, the paper cone prepared therefrom has high modulus, high strength and excellent acoustic properties, fully meeting the multiple requirements of speaker sound quality and performance; at the same time, the paper cone makes full use of bagasse pulp, gives full play to the value of agricultural waste, and takes into account environmental protection and cost-effectiveness.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a paper cone, wherein the raw materials for preparing the paper cone include the following components in parts by mass:

[0009] 60-90 parts of low beating degree bagasse pulp

[0010] 2-30 parts of high beating degree bagasse pulp

[0011] 5-20 parts of original ecological fiber;

[0012] The beating degree of the low-beating degree bagasse pulp is less than 30°SR, and the beating degree of the high-beating degree bagasse pulp is greater than 60°SR;

[0013] The original ecological fiber includes any one of log fiber, bamboo fiber, coconut shell fiber, palm fiber and hemp fiber, or a combination of at least two of them.

[0014] The paper basin provided by the present invention introduces native fibers, which retain the natural characteristics of plant raw materials, have a hollow structure and porosity, can maintain low density and high specific strength, and help maintain the low density and high strength of the paper basin. At the same time, the chemical composition of the native fibers mainly includes cellulose, hemicellulose and lignin, which is similar to the composition of pulp fibers, and is easy to combine with bagasse pulp fibers to improve acoustic properties and enhance physical properties. Moreover, the natural texture and pattern of the native fibers can be evenly dispersed in the paper basin, forming a more complete plant fiber appearance, presenting a unique wood appearance effect, and increasing attractiveness.

[0015] The present invention uses bagasse pulp as the main pulp raw material, and through the compounding of low-beating degree bagasse pulp and high-beating degree bagasse pulp, on the one hand, the two have good compatibility and jointly provide excellent basic physical properties. On the other hand, the high-beating degree bagasse pulp, as fine fibers filled between fibers, acts as a reinforcing auxiliary agent, and no additional reinforcing auxiliary agent is needed; the high beating degree makes the fiber surface fibrillated, the fine fibers and the fiber curling degree increase, providing more hydrogen bonding sites, increasing the bridging effect between bagasse pulp fibers, greatly improving the bonding force between fibers, and improving the performance of paper basins; at the same time, the high-beating degree fibers play the role of dispersion and adhesive, effectively promoting the uniform dispersion of the original ecological fibers and the pulp system, so that the fibers are tightly connected and well bonded.

[0016] In summary, the present invention improves the performance of the paper basin synergistically through the design and mutual compounding of low-beatenness bagasse pulp, high-beatenness bagasse pulp and original ecological fiber, so that the paper basin has high strength and high modulus, obtains excellent mechanical properties and acoustic properties, and has a unique wood appearance effect. Moreover, the paper basin uses bagasse pulp as the main pulp raw material, fully utilizes the value of agricultural waste, promotes the recycling of resources, and takes into account environmental protection and cost-effectiveness. The mid- and high-frequency bands of the speaker containing the paper basin are significantly improved, which increases the warmth and naturalness of the timbre, makes the sound fuller and clearer, and meets the market's dual demands for sound quality and performance.

[0017] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0018] Among the raw materials for preparing paper basins provided by the present invention, the mass proportion of the low-beating degree bagasse pulp is 60-90 parts, for example, it can be 62 parts, 65 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts, 80 parts, 82 parts, 85 parts or 88 parts, as well as specific point values ​​between the above point values. Due to limited space and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range, and 65-80 parts are preferred.

[0019] The mass proportion of the high-beating degree bagasse pulp is 2-30 parts, for example, it can be 3 parts, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts or 28 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range, preferably 10-20 parts.

[0020] The mass proportion of the original ecological fiber is 5-20 parts, for example, it can be 5 parts, 6 parts, 9 parts, 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts or 19 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range, preferably 8-15 parts.

[0021] The paper basin provided by the present invention uses bagasse pulp as the base pulp. Since bagasse fibers are short in length, thick in diameter, tough in fiber structure, and rough in surface, there are a large number of porous microstructures inside. These micropores have good adsorption properties for small molecular substances. The rough raised surface structure and a large number of micropores can improve the adsorption and viscosity of bagasse fibers. Bagasse fibers are multi-walled hollow tubular structures, the inner cavity shape and size are almost circular, the layer walls still contain fibrous structures, and the cell wall thickness varies. This special fiber morphology and structure can provide excellent strength performance for paper basins. At the same time, the shorter fiber length is conducive to the molding of the original ecological fiber in the pulp system, and improves the surface smoothness and quality of the final product.

[0022] In the present invention, by optimizing the ratio of low-beatenness bagasse pulp and high-beatenness bagasse pulp and combining a specific content of original ecological fiber, the paper basin achieves an excellent balance between strength, rigidity, modulus and acoustic performance.

[0023] The beating degree of the low-beatenness bagasse pulp is less than 30°SR, for example, it can be 12°SR, 15°SR, 16°SR, 18°SR, 20°SR, 22°SR, 24°SR, 25°SR, 26°SR or 28°SR, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range. Preferably, the beating degree of the low-beatenness bagasse pulp is 15-25°SR.

[0024] The paper basin of the present invention uses low-beating degree bagasse pulp (beating degree <30°SR) as the main raw material, which retains longer fibers and provides basic strength and rigidity; and adds a small amount of high-beating degree bagasse pulp, which produces a large number of fine fibers that increase the bonding between fibers, significantly improve the strength of the paper basin, and help improve the stability and uniformity of the paper basin. The low-beating degree bagasse pulp in the paper basin provides a fiber network skeleton, and the high-beating degree bagasse pulp increases the bonding force. The combination of the two complements each other to achieve excellent overall performance. The pore structure formed by the compounding of the low-beating degree bagasse pulp and the high-beating degree bagasse pulp is conducive to the propagation of sound waves, which helps to adjust the acoustic properties of the paper basin and improve the sound quality performance. By adjusting the ratio of high and low beating degrees, the physical properties of the paper basin can be flexibly adjusted according to specific needs to meet the requirements of different application scenarios. Moreover, a higher amount of low-beating degree bagasse pulp can reduce energy consumption, and a small amount of high-beating degree bagasse pulp can improve performance.

[0025] The beating degree of the high-beatenness bagasse pulp is >60°SR, for example, it can be 62°SR, 65°SR, 68°SR, 70°SR, 72°SR, 72°SR, 78°SR, 80°SR, 82°SR, 85°SR, 88°SR, 90°SR or 92°SR, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range. Preferably, the beating degree of the high-beatenness bagasse pulp is 70-90°SR.

[0026] As a preferred technical solution of the present invention, the beating degree of the high-beating bagasse pulp is 70-90°SR, which makes up for the dispersion and bonding problems between the original ecological fiber and the bagasse pulp, improves the fiber dispersion, helps the original ecological fiber to be evenly distributed, and at the same time enhances the fiber bonding, fills the gaps, and improves the overall strength. The addition of the high-beating bagasse pulp can overcome the molding difficulties of natural fibers, improve the molding properties of the paper basin, and improve the surface flatness. Moreover, it synergizes with the low-beating bagasse pulp and the original ecological fiber to further optimize the acoustic performance.

[0027] Specifically, the high-beating bagasse pulp makes the fibers more refined and the surface roughness increased through the beating process, which can help wrap and support the natural original ecological fibers, so that they are more evenly dispersed in the pulp system and reduce agglomeration or uneven distribution. Secondly, the beating action increases the exposure of hydroxyl groups on the surface of the bagasse pulp fibers, increases the surface area of ​​the bagasse fibers, and can form more physical and chemical bonding points with the original ecological fibers, and produce stronger hydrogen bonding with the original ecological fibers, thereby improving the bonding strength between the two. Thirdly, the fibers of the high-beating bagasse pulp have good flexibility and plasticity, which can effectively fill the gaps between the original ecological fibers, improve the mechanical properties and strength, and enhance the overall stability of the paper basin. Since the natural original ecological fibers are more complex in morphology and more difficult to shape, using them in combination with high-beating bagasse pulp is easy to shape and improves the formability of the mixed material; in addition, the fibers of the high-beating bagasse pulp fill the surface roughness of the natural fibers, which helps to improve the surface smoothness and quality of the paper basin.

[0028] The combination of high-beaten bagasse pulp and original ecological fiber not only improves the dispersibility and enhances the strength performance of the paper cone, but also produces a synergistic optimization effect on the acoustic performance of the material based on the special combination of bagasse pulp fiber and original ecological fiber, thereby improving the acoustic performance of the paper cone. Bagasse fiber has a certain porous structure. This microporous property can effectively absorb the high-frequency components in the sound waves and reduce unnecessary reflected noise, thereby improving the high-frequency response of the paper cone and the speaker, making the sound softer and fuller.

[0029] Preferably, the bagasse pulp in the low-beatenness bagasse pulp and the high-beatenness bagasse pulp is bleached bagasse pulp.

[0030] Preferably, the average fiber length of the bleached bagasse pulp is 0.6-2 mm, for example, it can be 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.6 mm or 1.8 mm, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0031] As a preferred technical solution of the present invention, the beating degree of the low-beatenness bagasse pulp is 15-25°SR, the average fiber length of the bagasse pulp is 0.6-2mm, and the fiber length of the bagasse pulp is moderate. The medium-length fibers can provide sufficient mechanical strength and help to form a relatively tight fiber network structure, thereby ensuring that the paper basin has good rigidity.

[0032] In the present invention, the original ecological fiber includes any one or a combination of at least two of log fiber, bamboo fiber, coconut shell fiber, palm fiber and hemp fiber. Among them, the log fiber mainly exists in the phloem and xylem of trees, which are separated from logs by mechanical or chemical methods, and the fiber wall thickness is moderate. The bamboo fiber mainly exists in the vascular bundle of bamboo, and is a natural bamboo fiber separated from bamboo by mechanical or chemical methods. The coconut shell fiber is naturally formed during the development of coconut fruit, exists in the middle layer of coconut shell, can be obtained by soaking, mechanical separation and other methods, and has rough fiber, high strength and good wear resistance. The palm fiber is naturally formed during the growth of palm trees, mainly exists on the surface of palm petioles and trunks, can be obtained by artificial stripping, combing and other methods, the fiber is slender, the fiber presents a porous structure, contains a large number of tiny gaps inside, has strong toughness and corrosion resistance. The hemp fiber is naturally formed during the growth of hemp plants, mainly exists in the phloem of plant stems, and is obtained by soaking, peeling, combing and other methods. The fiber is slender, high strength and good hygroscopicity.

[0033] Preferably, the length of the native fiber is 1-5 mm, for example, it can be 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, 4.2 mm, 4.5 mm or 4.8 mm, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0034] As a preferred technical solution of the present invention, the average length of the native fibers is 1-5 mm, and appropriate length selection can make them better dispersed in the pulp system.

[0035] Preferably, the mass percentage of low-beating degree bagasse pulp in the raw material for preparing the paper basin is 60-90%, for example, it can be 62%, 65%, 68%, 70%, 72%, 75%, 78%, 80%, 82%, 85% or 88%, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0036] Preferably, the mass percentage of high-beatenness bagasse pulp in the raw material for preparing the paper basin is 2-30%, for example, it can be 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25% or 28%, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0037] Preferably, the mass percentage of the original ecological fiber in the raw materials for preparing the paper basin is 5-20%, for example, it can be 6%, 8%, 10%, 12%, 14%, 15%, 16%, 18% or 19%, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0038] As a preferred technical solution of the present invention, the density of the paper cone is 0.5-0.6g / cm 3 , for example, it can be 0.51 g / cm 3 , 0.52g / cm 3 , 0.53g / cm 3 , 0.54g / cm 3 , 0.55g / cm 3 , 0.56g / cm 3 , 0.57g / cm 3 , 0.58g / cm 3 or 0.59g / cm 3 , and specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range, and further preferably 0.50-0.565 g / cm 3 .

[0039] Preferably, the Young's modulus of the paper basin is ≥4.5 GPa, for example, it can be 4.6 GPa, 4.8 GPa, 5 GPa, 5.1 GPa, 5.2 GPa, 5.4 GPa or 5.5 GPa, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range, and it is further preferred to be ≥4.6 GPa.

[0040] Preferably, the loss factor of the paper cone is 0.04-0.07, for example, it can be 0.042, 0.045, 0.05, 0.055, 0.06, 0.065 or 0.068, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range, and 0.045-0.065 is further preferred.

[0041] Preferably, the Z-direction tensile strength of the paper cone is ≥ 1N / mm 2 , for example, it can be 1.02N / mm 2 , 1.05N / mm 2 , 1.1N / mm 2 , 1.15N / mm 2 , 1.2N / mm 2 , 1.25N / mm 2 or 1.3N / mm2 , as well as specific point values ​​between the above point values, due to space limitations and for the sake of brevity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0042] In a second aspect, the present invention provides a method for preparing the paper cone as described in the first aspect, the preparation method comprising the following steps:

[0043] The low-beating degree bagasse pulp, the high-beating degree bagasse pulp and the original ecological fiber are mixed and dispersed evenly to obtain a mixed pulp;

[0044] The mixed slurry is filtered and formed to obtain a wet paper basin embryo;

[0045] The wet paper cone embryo is subjected to hot pressing and drying to obtain the paper cone.

[0046] Preferably, the method for preparing the low-beatenness bagasse pulp comprises: deflocculanting and beating a bagasse pulp board to obtain the low-beatenness bagasse pulp.

[0047] And / or, the method for preparing the high-beatenness bagasse pulp comprises: deflocculanting and beating a bagasse pulp board to obtain the high-beatenness bagasse pulp.

[0048] In the present invention, the low-freeness bagasse pulp is prepared by deflaking and slightly beating commercial bagasse pulp to obtain bagasse pulp with a freeness of less than 30°SR, preferably 15-25°SR.

[0049] Preferably, the gap between the flying knife and the bottom knife during the pulping process of preparing the high-beating degree bagasse pulp is 0.7-1mm, for example, it can be 0.72mm, 0.75mm, 0.78mm, 0.8mm, 0.82mm, 0.85mm, 0.88mm, 0.9mm, 0.92mm, 0.95mm or 0.98mm, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0050] Preferably, the pulping concentration for preparing the high-beatenness bagasse pulp is 1.5-3%, for example, it can be 1.6%, 1.8%, 2%, 2.2%, 2.4%, 2.5%, 2.6% or 2.8%, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0051] As a preferred technical solution of the present invention, by setting the gap between the flying knife and the bottom knife to 0.7-1mm during the beating process, a gentler light knife beating method is used to squeeze and knead the bagasse fibers, which can prevent excessive fiber cutting due to excessive beating load, protect the fiber structure, reduce fiber damage, and produce more fine fibers rather than fiber cutting, so as to form a fiber morphology with a high degree of fibrillation. Appropriate gap setting can avoid excessive fiber fragmentation, maintain a certain fiber length and fiber integrity, and ensure that the high-beating degree bagasse pulp has good physical properties. At the same time, setting a suitable beating concentration (1.5-3%) can ensure that the fibers are subjected to a more uniform beating action, which is conducive to sufficient fibrillation, reducing agglomeration, and improving efficiency.

[0052] Preferably, the rotation speed of the mixed decomposition is 500-2000rpm, for example, it can be 600rpm, 800rpm, 1000rpm, 1200rpm, 1400rpm, 1500rpm, 1600rpm or 1800rpm, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0053] Preferably, the mixing and decomposition time is 1-10 min, for example, it can be 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min or 9 min, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0054] Preferably, the slurry concentration of the mixed slurry is adjusted to 0.1-0.5%, and then filtered and formed to obtain a wet paper basin embryo.

[0055] Preferably, the slurry concentration of the mixed slurry is adjusted to 0.1-0.5% by adding water. For example, the slurry concentration can be 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4% or 0.45%, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0056] Preferably, the filtering and forming is carried out by a papermaking machine.

[0057] Preferably, the temperature of the hot pressing drying is 150-200°C, for example, it can be 155°C, 160°C, 165°C, 170°C, 175°C, 180°C, 185°C, 190°C or 195°C, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range, and 160-180°C is further preferred.

[0058] Preferably, the hot press drying time is 20-90s, for example, it can be 25s, 30s, 35s, 40s, 45s, 50s, 55s, 60s, 65s, 70s, 75s, 80s or 85s, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range, and 40-60s is further preferred.

[0059] Preferably, the preparation method comprises the following steps:

[0060] The bagasse pulp board is debonded and beaten to obtain low-beating degree bagasse pulp and high-beating degree bagasse pulp respectively;

[0061] The low-beating degree bagasse pulp, the high-beating degree bagasse pulp and the original ecological fiber are mixed and dispersed evenly to obtain a mixed pulp;

[0062] The mixed slurry is adjusted to a slurry concentration of 0.1-0.5%, and then filtered and formed by a paper machine to obtain a wet paper basin embryo;

[0063] The wet paper basin embryo is hot-pressed and dried at 160-180° C. for 40-60 seconds to obtain the paper basin.

[0064] In a third aspect, the present invention provides a loudspeaker, comprising the paper cone as described in the first aspect.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] (1) In the paper basin provided by the present invention, low-beatenness bagasse pulp is used as the main raw material to ensure that the paper basin has good basic physical properties; it is matched with high-beatenness bagasse pulp and native ecological fiber, and the pulp system has good compatibility, which improves the strength performance of the paper basin; at the same time, high-beatenness bagasse pulp can play the role of a reinforcing auxiliary agent, providing more hydrogen bonding sites, so that the native ecological fiber can be better combined with the pulp fiber, ensuring excellent overall performance, so that the paper basin has high strength and high modulus, and obtains excellent mechanical properties and acoustic properties.

[0067] (2) The present invention introduces native fibers, which not only make the paper cone have high strength and modulus, but also perform well in the mid-frequency and high-frequency bands, providing the paper cone with a special tone and appearance, and meeting the requirements of mid-to-high-end speakers for paper cones.

[0068] (3) The paper basin of the present invention uses bagasse pulp as the main raw material, which avoids excessive dependence on wood resources, helps to protect forest resources, is environmentally friendly in the production process, reduces the use of chemical additives, and meets the current market demand trend for sustainable materials. In addition, the present invention makes full use of bagasse pulp, gives full play to the value of agricultural waste, promotes the recycling of resources, and takes into account both environmental protection and cost-effectiveness. DETAILED DESCRIPTION

[0069] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0070] As used herein, the terms "comprises," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0071] In the following specific embodiments of the present invention, the raw materials used are all commercially available materials, and the specific sources are as follows:

[0072]

[0073]

[0074] Preparation Example

[0075] Preparation of bagasse pulp with different beating degrees: The bagasse pulp board is deflaked and lightly beaten with a knife in a pulper with a beating concentration of 1.5% to obtain bagasse pulp with beating degrees of 15°SR, 20°SR, 25°SR, 30°SR, 40°SR, 50°SR, 70°SR, 80°SR and 90°SR respectively, and set aside.

[0076] The paper cone and the method for preparing the same according to the present invention will be described in detail below by taking a plurality of embodiments as examples, but the paper cone and the method for preparing the same according to the present invention are not limited to these embodiments.

[0077] Example 1

[0078] A paper cone and a preparation method thereof, wherein the raw materials for preparing the paper cone include the following components in parts by mass:

[0079] 20°SR bagasse pulp 70 parts

[0080] 70°SR bagasse pulp 15 parts

[0081] 15 parts of bamboo fiber;

[0082] The preparation method of the paper cone is as follows:

[0083] (1) According to the above formula, two kinds of bagasse pulp and bamboo fiber were mixed and dispersed at a speed of 1000 rpm for 5 minutes to obtain a mixed slurry;

[0084] (2) adjusting the slurry concentration of the mixed slurry to 0.1%, filtering and forming on a papermaking machine to obtain a wet paper cone embryo;

[0085] (3) The wet paper basin embryo is hot-pressed and dried in a hot-pressing mold at 180° C. for 40 seconds to obtain the paper basin.

[0086] Examples 2-7, Comparative Examples 1-7

[0087] A paper cone and a preparation method thereof, which differs from Example 1 only in that the components and preparation process parameters are different, as shown in Table 1, wherein "--" represents that the component is not added; the process parameters not shown in Table 1 are the same as those in Example 1.

[0088] Table 1

[0089]

[0090] Comparative Example 8

[0091] A paper basin, which differs from Example 1 only in that 70°SR bagasse pulp is replaced by 70°SR BKP pulp of equal mass, and other components, amounts and preparation methods are the same as those in Example 1.

[0092] Comparative Example 9

[0093] A paper basin, which differs from Example 1 only in that 70°SR bagasse pulp is replaced with nanocellulose of equal mass, and other components, amounts and preparation methods are the same as those in Example 1.

[0094] Comparative Example 10

[0095] A paper basin, which differs from Example 1 only in that 70°SR bagasse pulp is replaced with an equal mass of sodium lignin sulfonate, and other components, amounts and preparation methods are the same as those in Example 1.

[0096] Comparative Example 11

[0097] A paper basin, which differs from Example 1 only in that 70°SR bagasse pulp is replaced with 70°SR bamboo pulp of equal mass, and other components, amounts and preparation methods are the same as those in Example 1.

[0098] The performance test of the paper cones provided in Examples 1-7 and Comparative Examples 1-11 was performed as follows:

[0099] (1) Density: The mass of the paper cone is measured using an analytical balance. The thickness of the paper cone is measured using a thickness gauge. The thickness of the same sample is measured three times and the average value is taken to calculate the density of the paper cone.

[0100] (2) Young's modulus and loss factor: Young's modulus and loss factor were measured using the MPM material parameter module in the KLIPPEL test system;

[0101] (3) Z-direction tensile strength: The Z-direction tensile strength of the paper is used to indicate the interlayer bonding strength of the paper cone. The greater the Z-direction tensile strength, the greater the interlayer bonding strength. For specific methods, refer to GB / T 31110-2014.

[0102] The test data is shown in Table 2:

[0103] Table 2

[0104]

[0105]

[0106] It can be seen from the test data in Table 2 that the present invention improves the mechanical properties and acoustic properties of the paper basin by designing low-beating degree bagasse pulp, high-beating degree bagasse pulp and original ecological fiber and compounding them in a specific ratio, so that the density of the paper basin provided by Examples 1-7 is 0.51-0.561 g / cm 3 , Young's modulus is 4.6-5.1GPa, loss factor is 0.045-0.065, and Z-direction tensile strength is 1.05-1.22N / mm 2 The paper cone has the characteristics of low density, high modulus, high strength and high sensitivity. At the same time, the acoustic performance of the paper cone is optimized, showing stronger high-frequency and mid-frequency response, smoother frequency response curve, and the overall sound quality is fuller and clearer.

[0107] The paper basin provided by the present invention is compounded with low-beatenness bagasse pulp with a beating degree of less than 30°SR and high-beatenness bagasse pulp with a beating degree of more than 60°SR in a specific proportion, and combined with native ecological fiber. Through the synergistic effect between the components, the paper basin achieves an excellent balance between strength, rigidity, modulus and acoustic properties.

[0108] Comparative Example 1 uses 50° SR bagasse pulp to replace the high-beatening degree bagasse pulp defined in the present invention, resulting in a decrease in the bonding force between fibers, which is manifested as a decrease in modulus.

[0109] The excessive amount of high-beatenness bagasse pulp in the paper basin of Comparative Example 2 will increase the drainage time of wet pulp and reduce production efficiency. At the same time, it will cause the compactness of the paper basin to increase, the density to increase, the loss factor to decrease, and affect the sensitivity and acoustic performance.

[0110] No virgin fiber was added to the paper cones of Comparative Examples 3 and 4, resulting in a significant decrease in the loss factor of the paper cones.

[0111] In Comparative Example 5, no high-beatenness bagasse pulp was added, resulting in a significant decrease in the modulus and interlayer bonding strength of the paper basin, indicating that the combination of simple low-beatenness bagasse pulp and original ecological fiber is not ideal.

[0112] In Comparative Example 6, 30° SR bagasse pulp is used to replace the low-beatening degree bagasse pulp specified in the present invention, resulting in a significant decrease in the modulus and loss factor of the paper cone.

[0113] Comparative Example 7 uses 40° SR bagasse pulp to replace the combination of low-beatenness bagasse pulp and high-beatenness bagasse pulp in the present invention, resulting in an increase in the density of the paper cone and a decrease in the modulus and loss factor.

[0114] In Comparative Example 8, high-beatenness bleached sulfate pulp BKP is used to replace high-beatenness bagasse pulp. The density of the paper basin is increased. At the same time, since the compatibility between wood pulp fiber and bagasse pulp is not as good as that of the same type of pulp, the compatibility is insufficient and the interlayer bonding strength is also reduced.

[0115] Comparative Examples 9 and 10 respectively use nanocellulose and sodium lignin sulfonate to replace high-beatenness sugarcane pulp, which have limited effect on the enhancement of the paper basin. The main reason is that the added nanocellulose and sodium lignin sulfonate have small particle sizes, and most of them will be lost during the water filtration process after mixing with the pulp. At the same time, the main function of nanocellulose and sodium lignin sulfonate is to enhance hydrogen bonds, and they themselves cannot support the fiber structure. The high-beatenness bagasse pulp defined in the present invention itself has fibers of a certain length, which can be better retained on the filter screen. In addition, the degree of fibrillation is high, so it can serve as the main body of the fiber network of the paper basin, and can give full play to its filling, bridging and bonding functions to enhance performance.

[0116] In Comparative Example 11, bamboo pulp with the same beating degree was used to replace the high-beating degree sugarcane pulp, and the modulus and loss factor of the paper cone produced were reduced.

[0117] The applicant declares that the present invention uses the above embodiments to illustrate the paper cone and its preparation method, and the loudspeaker containing the same, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of 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 basin, characterized in that: The raw materials for preparing the paper basin include the following components in parts by mass: 60-90 parts of low beating degree bagasse pulp 2-30 parts of high beating degree bagasse pulp 5-20 parts of original ecological fiber; The beating degree of the low-beating degree bagasse pulp is less than 30°SR, and the beating degree of the high-beating degree bagasse pulp is greater than 60°SR; The original ecological fiber includes any one of log fiber, bamboo fiber, coconut shell fiber, palm fiber and hemp fiber, or a combination of at least two of them.

2. The paper cone according to claim 1, characterized in that: The low-beatenness bagasse pulp has a beating degree of 15-25° SR; Preferably, the freeness of the high-freeness bagasse pulp is 70-90° SR.

3. The paper cone according to claim 1 or 2, characterized in that: The bagasse pulp in the low-beating degree bagasse pulp and the high-beating degree bagasse pulp is bleached bagasse pulp.

4. The paper cone according to any one of claims 1 to 3, characterized in that: The length of the original ecological fiber is 1-5 mm.

5. A method for preparing a paper cone according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: The low-beating degree bagasse pulp, the high-beating degree bagasse pulp and the original ecological fiber are mixed and dispersed evenly to obtain a mixed pulp; The mixed slurry is filtered and formed to obtain a wet paper basin embryo; The wet paper cone embryo is subjected to hot pressing and drying to obtain the paper cone.

6. The preparation method according to claim 5, characterized in that: The method for preparing low-beating degree bagasse pulp comprises: decomposing and beating bagasse pulp sheets to obtain the low-beating degree bagasse pulp; And / or, the method for preparing the high-beatenness bagasse pulp comprises: decomposing and beating a bagasse pulp board to obtain the high-beatenness bagasse pulp; Preferably, the gap between the flying knife and the bottom knife during the beating process of preparing the high-beating degree bagasse pulp is 0.7-1 mm; Preferably, the pulping concentration for preparing the high-beatenness bagasse pulp is 1.5-3%.

7. The preparation method according to claim 5 or 6, characterized in that: The slurry concentration of the mixed slurry is adjusted to 0.1-0.5%, and then filtered and formed to obtain a wet embryo of a paper cone; Preferably, the filtering and forming is carried out by a papermaking machine.

8. The preparation method according to any one of claims 5 to 7, characterized in that: The temperature of the hot press drying is 150-200°C, preferably 160-180°C; Preferably, the hot press drying time is 20-90 s, more preferably 40-60 s.

9. The preparation method according to any one of claims 5 to 8, characterized in that: The preparation method comprises the following steps: The bagasse pulp board is debonded and beaten to obtain low-beating degree bagasse pulp and high-beating degree bagasse pulp respectively; The low-beating degree bagasse pulp, the high-beating degree bagasse pulp and the original ecological fiber are mixed and dispersed evenly to obtain a mixed pulp; The mixed slurry is adjusted to a slurry concentration of 0.1-0.5%, and then filtered and formed by a paper machine to obtain a wet paper basin embryo; The wet paper basin embryo is hot-pressed and dried at 160-180° C. for 40-60 seconds to obtain the paper basin.

10. A loudspeaker, characterized in that: The speaker comprises the paper cone as described in any one of claims 1-4.

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