Bamboo material for manufacturing fiddlestick and preparation method thereof

Abstract

The invention relates to the technical field of musical instrument materials, in particular to a bamboo material for manufacturing a fiddlestick and a preparation method of the bamboo material. The bamboo material is a bamboo block prepared by taking tea stem bamboos as a raw material; the density of the bamboo blocks is 0.75-0.85 g / cm < 3 >, the dynamic Young modulus is 1.2-2.0 * 10 < 11 > N / cm < 2 >, and the sound conduction speed at normal temperature and normal pressure is 11000-15000m / s; the characteristics that bamboo fibers of the tea stem bamboos are uniform in thickness, compact in arrangement and large in density, and the bamboo fibers are moderate in toughness and rigidity, so that vibration sound production and sound transmission of the fiddlestick are facilitated are utilized, and the timbre performance of the fiddlestick made of the tea stem bamboos is remarkably superior to that of other substitute materials; meanwhile, through targeted selection of the density, the dynamic Young modulus and the sound speed of the tea-stalk bamboo, the tea-stalk bamboo has better tone quality, so that the tea-stalk bamboo can replace Brazil sappan wood to serve as a bow material without reducing the tone quality of the bow; the bamboo material adopts common tea stem bamboos as raw materials, is low in cost, wide in source, excellent in performance and suitable for replacing Brazil sappan wood to serve as the material of the fiddlestick.

Description

Technical Field

[0001] The invention relates to the technical field of biomass materials, specifically to the technical field of musical instrument materials, and in particular to a bamboo material for manufacturing a violin bow and a preparation method thereof. Background Art

[0002] Most traditional violin bows are made from a whole piece of Brazilian wood. The specific production method is: first cut the wood into a rectangular structure, then use a thumb planer to cut it into the basic shape of the violin bow, and finally install the silver wire leather cover, bow hair, cow bone pieces, cow horn pieces and other auxiliary structures to get a complete violin bow. However, at the 19th Conference of the Parties (CoP19) in November 2022, Brazilian wood was listed in the Convention on International Trade in Endangered Species of Wild Fauna and Flora for protection, which led to a significant reduction in the production of violin bows made of this material. In view of this, it is inevitable to use other materials to replace Brazilian wood to make violin bows. Among them, carbon fiber composite materials, Yunnan Su wood, green sandalwood and Bornango Su wood are the more common materials that can replace Brazilian wood to make violin bows, but in actual application, it is found that today's alternative materials have more or less certain defects. For example, although the performance and tone of violin bows made of carbon fiber composite materials are excellent, they are expensive and the production process is complicated; although the sources of Yunnan Sumu, Green Sandalwood and Bornango Sumu are not affected by current production, the performance and tone of the violin bows made from them are inferior to those of Brazilian Sumu.

[0003] In order to obtain a low-cost, sustainable source of violin bow material with excellent performance and tone, people have also proposed a technical solution to make violin bows from bamboo. Studies have shown that bamboo has many advantages as a violin bow material: the direction of bamboo fibers is extremely consistent, which is better than most high-grade woods; the microfibril angle of bamboo is between 7-13°, while the microfibril angle of most woods is around 25°, and the variation is large, so the Young's modulus of bamboo along the grain is much better than that of wood; the density of bamboo is relatively small, about 0.7-0.9 g / cubic centimeter; the texture of bamboo is straight and elastic, and it is not easy to deform after proper bending and shaping. The proper bending direction can keep the bending shape longer; therefore, the violin bow made of bamboo is not only strong, but also of appropriate weight. In addition, the solid bamboo bow rod material is uniform, and the center of gravity of the violin bow is clear, which is more suitable for violinists to operate and play music.

[0004] Patent publication number CN101477794A discloses a bamboo straight violin bow. This scheme uses bamboo material instead of Brazilian wood or carbon fiber to make the bow rod of the violin bow, and equips the straight bow rod of the bamboo modern violin bow with horsetail bow hair. A horsetail storage device is set at the bow root to allow the bow hair to freely expand and contract, thereby making a bamboo modern straight violin bow. However, although this bamboo straight violin bow can basically meet various performance requirements of the violin bow, due to the lack of targeted selection and treatment of the bamboo material, its tone is significantly lower than that of the Brazilian wood bow, which is not conducive to the large-scale promotion and application of bamboo violin bows. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the existing bamboo violin bows, such as poor timbre and disadvantages of large-scale promotion and application, and propose a bamboo material for manufacturing violin bows and a preparation method thereof.

[0006] The present invention provides a bamboo material for manufacturing a violin bow, wherein the bamboo material is a bamboo block prepared from tea bamboo as a raw material; and the density of the bamboo block is 0.75-0.85 g / cm 3 , the dynamic Young's modulus is 1.2-2.0×10 11 N / cm 2 The sound conduction speed at normal temperature and pressure is 11000-15000m / s.

[0007] The invention discloses a bamboo material for manufacturing a violin bow, which is a tea-stem bamboo material with a specific density, a dynamic Young's modulus and a speed of sound. The bamboo material utilizes the characteristics that the bamboo fibers of the tea-stem bamboo are uniform in thickness and compactly arranged, have a large density, and have moderate toughness and rigidity, which are very beneficial to the vibration and sound generation of the violin bow and the propagation of sound. The violin bow made of the bamboo material has significantly better timbre performance than other alternative materials. Meanwhile, through the targeted selection of the density, the dynamic Young's modulus and the speed of sound of the tea-stem bamboo, the material has a better timbre, thereby being able to replace Brazilian wood as the violin bow material without reducing the timbre of the violin bow. The bamboo material adopts common tea-stem bamboo as a raw material, has low cost, is widely available, has excellent performance, and is suitable for replacing Brazilian wood as the violin bow material.

[0008] Preferably, the dynamic Young's modulus of the bamboo block is 1.4-1.8×10 11 N / cm 2 The sound conduction speed at normal temperature and pressure is 12000-13000m / s. The preferred bamboo material has better performance and timbre.

[0009] Among them, preferably, the width of the bamboo material is 0.8-1.2 cm, the thickness is greater than 2.75 mm, and the length is greater than 73 cm; the preferred bamboo block size is convenient for later processing and has higher processing efficiency.

[0010] Among them, preferably, the tea-stem bamboo used as the raw material has a growth age of 3-6 years; if the growth age is insufficient, the bamboo has low hardness, too high water content, large shrinkage when drying, low material density and strength, which are not conducive to the vibration of the bow and the propagation of sound, and the timbre of the finished bow deteriorates significantly; if the growth age is too old, the bamboo density decreases, the texture becomes brittle, which is also not conducive to the vibration of the bow and the propagation of sound, and the timbre deteriorates significantly; more preferably, the tea-stem bamboo has a growth age of 4-5 years.

[0011] Preferably, the tea-straw bamboo used as raw material is a trunk 1-4 meters away from the root; the strength and uniformity of the bamboo fiber layer are related to the selection position of the tea-straw bamboo. If the selection position is too low or high, the strength of the bamboo fiber layer changes significantly, which is not conducive to the vibration of the bow and the propagation of sound, and the timbre deteriorates significantly.

[0012] Preferably, the internode spacing of the tea-stem bamboo used as the raw material is 30-50cm; if the internode spacing is too small, it means that the growth environment is bad, the growth is slow, and long-term sunlight leads to excessive density and strength; if the internode spacing is too large, the growth is too fast, resulting in low bamboo density and reduced strength, which is not conducive to the vibration of the bow and the propagation of sound, and the timbre deteriorates.

[0013] Preferably, the water content of the bamboo material is 0.85-1.2%; the water content directly affects the various properties of the bamboo material, and the bamboo material has a better tone at a preferred water content.

[0014] In order to achieve the above object, the present invention further provides a method for preparing a bamboo material for manufacturing a violin bow, comprising the following steps: (1) subjecting the felled tea bamboo to natural shade drying and cutting into predetermined lengths to obtain dried bamboo tubes; (2) extracting oil from the dried bamboo tube to obtain an oil-extracted bamboo tube; (3) Cutting the oil-pulled bamboo tube into bamboo strips along the axial direction (along the direction of the bamboo fibers); (4) trimming the bamboo strips and removing the glaze layer to obtain pre-treated bamboo blocks; (5) straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with the same width and thickness; (6) The bamboo material is carbonized to obtain a bamboo material for manufacturing a violin bow.

[0015] The invention discloses a method for preparing a bamboo material for manufacturing a violin bow. By carrying out targeted oil extraction and carbonization treatment on tea-stem bamboo, the oil and moisture in bamboo fibers can be effectively removed, thereby increasing the hardness and modulus of the bamboo fibers, improving the sound transmission speed and vibration frequency of the bamboo fibers, and being beneficial to improving the timbre of the bamboo materials. The method can also carbonize the surface of the bamboo materials, thereby making the bamboo materials have better corrosion resistance without affecting the timbre of the bamboo materials, and facilitating the long-term use of the violin bows. The method for preparing the bamboo material can significantly improve the timbre and corrosion resistance of the bamboo materials, and the preparation method is simple and reliable, and is suitable for large-scale production of bamboo materials for manufacturing violin bows.

[0016] Among them, in step (1), preferably, the moisture content of the tea stalk bamboo after natural shade drying is 8-13%; the size of the moisture content directly affects the effect of oil extraction and carbonization treatment, thereby affecting various properties of the bamboo material. The preferred moisture content makes the prepared bamboo material have better timbre.

[0017] Among them, in step (2), the oil pulling treatment refers to high-temperature baking of the bamboo tube to extract the oil and water in the bamboo material, thereby making the bamboo fiber more compact and more conducive to the transmission of vibration and sound waves; preferably, the temperature of the oil pulling treatment is 400-600°C and the time is 3-5 minutes; it is preferable to extract the oil on the surface of the bamboo so that the surface of the bamboo is slightly oily. Through the oil pulling treatment, the oil and part of the water in the bamboo fiber can be removed, the various properties of the bamboo material are improved, and it has a significant effect on increasing the timbre of the bamboo material.

[0018] Among them, in step (4), the knot trimming treatment refers to grinding the protrusions at the bamboo knots to make them smooth, so as to make the thickness of the bamboo strips uniform, which is convenient for further processing in the later stage.

[0019] Among them, removing the enamel layer refers to removing the enamel layer on the surface of the bamboo strips, thereby exposing the bamboo fibers; by removing the enamel layer, the material of the bamboo strips can be made uniform, the sound wave propagation speed is consistent, and the vibration is more uniform, which is beneficial to improving the timbre of the bamboo material; preferably, the thickness of the enamel layer is 0.1-0.15cm.

[0020] Wherein, in step (5), preferably, the straightening treatment method is: after heating the bent part of the bamboo block, straighten it with a straightening board to make the longitudinal fibers in the bamboo block straight.

[0021] Preferably, the heating temperature is 130-180° C. and the heating time is 5-10 seconds. The preferred temperature and time can quickly soften the bamboo block to facilitate straightening without causing the bamboo fibers to break, thereby significantly reducing the performance of the bamboo block.

[0022] Preferably, during the straightening process, the heating times for the same part should not exceed 2 times; too many heating times will cause the performance of the bamboo block to be greatly reduced, thereby affecting the timbre of the bamboo block.

[0023] The trimming process refers to calibrating the size of the bamboo block to make the thickness and width of the bamboo block consistent, which is convenient for later processing.

[0024] Among them, in step (6), preferably, the temperature of the carbonization treatment is 150-200°C and the time is 12-18 minutes; the preferred carbonization parameters can better carbonize the bamboo, thereby improving various properties of the bamboo, which is beneficial to improving the timbre and corrosion resistance of the bamboo.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. The bamboo material for manufacturing a violin bow of the present invention utilizes the characteristics that the bamboo fibers of tea-stem bamboo are uniform in thickness, compactly arranged, and have a high density. The bamboo fibers have moderate toughness and rigidity, which are very beneficial to the vibration and sound generation of the violin bow and the propagation of sound. The timbre performance of the violin bow made of the bamboo material is significantly better than that of other alternative materials.

[0026] 2. The bamboo material for manufacturing a violin bow of the present invention has a more excellent timbre through targeted selection of tea bamboo density, dynamic Young's modulus and speed of sound, so that it can replace Brazilian sumac as a violin bow material without reducing the timbre of the violin bow.

[0027] 3. The bamboo material for manufacturing a violin bow of the present invention uses common tea-stem bamboo as raw material, which has low cost, wide source, excellent performance, and is suitable for replacing Brazilian sumac as the material for violin bows.

[0028] 4. The present invention provides a method for preparing a bamboo material for manufacturing a violin bow. By subjecting tea-stem bamboo to targeted oil extraction and carbonization treatment, the hardness and modulus of bamboo fiber are increased, and the sound transmission speed and vibration frequency of bamboo fiber are improved, which is beneficial to improving the timbre of bamboo material.

[0029] 5. The preparation method of the bamboo material for manufacturing a violin bow of the present invention is simple and reliable, and is suitable for large-scale production of the bamboo material for manufacturing a violin bow. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0031] Example 1 A bamboo material for making a violin bow, wherein the raw material is a 2m long bamboo trunk with a growth age of 4 years, a bamboo node spacing of 35-45cm, and a distance from the root of 1 to 3 meters; The preparation method comprises: (1) The felled tea bamboo is naturally shade-dried and cut into a specified length to obtain a dry bamboo tube (length 1 m; moisture content 10%); (2) subjecting the dried bamboo tube to oil extraction treatment (temperature 500°C, time 4 min) to obtain an oil-extracted bamboo tube; (3) Cut the oil-pulled bamboo tube into bamboo strips with a width of 1 cm along the axial direction; (4) trimming the bamboo strips (grinding the protrusions at the bamboo strips to make them smooth) and removing the glaze layer (removing a portion with a thickness of 0.1 cm on the surface of the bamboo strips) to obtain pretreated bamboo blocks; (5) Straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with uniform width and thickness (width 1 cm, thickness 3.5 mm, length 1 m); (6) The bamboo material is carbonized (temperature is 180°C, time is 15 min) to obtain a bamboo material for manufacturing a violin bow.

[0032] Bamboo material properties: density is 0.82g / cm 3 , the dynamic Young's modulus is 1.5×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 12600m / s.

[0033] Example 2 A bamboo material for making a violin bow, wherein the raw material is a 6-year-old tea bamboo trunk (3m long), with a bamboo node spacing of 40-50cm and a distance from the root of 1-4m; The preparation method comprises: (1) The felled tea bamboo is naturally shade-dried and cut into a specified length to obtain a dry bamboo tube (length 1 m; moisture content 13%); (2) subjecting the dried bamboo tube to oil extraction treatment (temperature 600°C, time 4 min) to obtain an oil-extracted bamboo tube; (3) Cut the oil-pulled bamboo tube into bamboo strips with a width of 0.8 cm along the axial direction; (4) trimming the bamboo strips (grinding the protrusions at the bamboo strips to make them smooth) and removing the glaze layer (removing a portion with a thickness of 0.15 cm on the surface of the bamboo strips) to obtain pretreated bamboo blocks; (5) Straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with uniform width and thickness (width 0.8 cm, thickness greater than 3.5 mm, and length 1 m); (6) The bamboo material is carbonized (temperature is 150°C, time is 18 min) to obtain a bamboo material for manufacturing a violin bow.

[0034] Bamboo material properties: density is 0.85g / cm 3 , the dynamic Young's modulus is 1.2×1011 N / cm 2 The speed of sound transmission at normal temperature and pressure is 15000m / s.

[0035] Example 3 A bamboo material for making a violin bow, wherein the raw material is a 3-year-old bamboo trunk (1m long) with a bamboo node spacing of 30-40cm and a distance from the root of 1-2m; The preparation method comprises: (1) The felled tea bamboo is naturally shade-dried and cut into a specified length to obtain a dry bamboo tube (length 1 m; moisture content 8%); (2) subjecting the dried bamboo tube to oil extraction treatment (temperature 400°C, time 5 min) to obtain an oil-extracted bamboo tube; (3) Cut the oil-pulled bamboo tube into bamboo strips with a width of 1.2 cm along the axial direction; (4) trimming the bamboo strips (grinding the protrusions at the bamboo strips to make them smooth) and removing the glaze layer (removing a portion with a thickness of 0.1 cm on the surface of the bamboo strips) to obtain pretreated bamboo blocks; (5) Straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with uniform width and thickness (width 1.2 cm, thickness 3.25 mm, length 1 m); (6) The bamboo material is carbonized (temperature is 200°C, time is 12 min) to obtain a bamboo material for manufacturing a violin bow.

[0036] Bamboo material properties: density is 0.75g / cm 3 , the dynamic Young's modulus is 2.0×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 11000m / s.

[0037] Example 4 A bamboo material for making a violin bow, wherein the raw material is a 2m long tea bamboo trunk with a growth age of 4 years, a bamboo node spacing of 30-50cm, and a distance from the root of 1-3 meters; The preparation method comprises: (1) The felled tea bamboo is naturally shade-dried and cut into a specified length to obtain a dry bamboo tube (length 1 m; moisture content 11%); (2) subjecting the dried bamboo tube to oil extraction treatment (temperature 550°C, time 3.5 min) to obtain an oil-extracted bamboo tube; (3) Cut the oil-pulled bamboo tube into bamboo strips with a width of 0.85 cm along the axial direction; (4) trimming the bamboo strips (grinding the protrusions at the bamboo strips to make them smooth) and removing the glaze layer (removing a portion with a thickness of 0.12 cm on the surface of the bamboo strips) to obtain pretreated bamboo blocks; (5) Straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with uniform width and thickness (width 0.85 cm, thickness 3.18 mm, length 1 m); (6) The bamboo material is carbonized (temperature is 160°C, time is 13 min) to obtain a bamboo material for manufacturing a violin bow.

[0038] Bamboo material properties: density is 0.79g / cm 3 , the dynamic Young's modulus is 1.6×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 12600m / s.

[0039] Example 5 A bamboo material for making a violin bow, wherein the raw material is a 1-year-old bamboo trunk (2m long) with a bamboo node spacing of 35-45cm and a distance from the root of 1 to 3 meters; The preparation method comprises: (1) The felled tea bamboo is naturally shade-dried and cut into a specified length to obtain a dry bamboo tube (length 1 m; moisture content 14%); (2) subjecting the dried bamboo tube to oil extraction treatment (temperature 550°C, time 7 min) to obtain an oil-extracted bamboo tube; (3) Cut the oil-pulled bamboo tube into bamboo strips with a width of 1 cm along the axial direction; (4) trimming the bamboo strips (grinding the protrusions at the bamboo strips to make them smooth) and removing the glaze layer (removing a portion with a thickness of 0.1 cm on the surface of the bamboo strips) to obtain pretreated bamboo blocks; (5) Straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with uniform width and thickness (width 1 cm, thickness 3.5 mm, length 1 m); (6) The bamboo material is carbonized (temperature is 190°C, time is 23 min) to obtain a bamboo material for manufacturing a violin bow.

[0040] Bamboo material properties: density is 0.76g / cm 3 , the dynamic Young's modulus is 1.2×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 11200m / s.

[0041] Comparative Example 1 A bamboo material for making a violin bow, wherein the raw material is a 1-year-old bamboo trunk (2m long) with a bamboo node spacing of 35-45cm and a distance from the root of 1 to 3 meters; The preparation method comprises: the same as in Example 1; Bamboo material properties: density is 0.73g / cm3 , the dynamic Young's modulus is 1.1×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 10500m / s.

[0042] Comparative Example 2 A bamboo material for making a violin bow, the raw material being a 7-year-old bamboo trunk (2m long) with a bamboo node spacing of 35-45cm and a distance from the root of 1 to 3 meters; The preparation method comprises: the same as in Example 1; Bamboo material properties: density is 0.85g / cm 3 , the dynamic Young's modulus is 2.1×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 15500m / s.

[0043] Comparative Example 3 A bamboo material for making a violin bow, the raw material being a 4-year-old tea bamboo trunk (2m long) with a bamboo node spacing of 20-25cm and a distance from the root of 1 to 3 meters; The preparation method comprises: the same as in Example 1; Bamboo material properties: density is 0.83g / cm 3 , the dynamic Young's modulus is 2.2×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 14500m / s.

[0044] Comparative Example 4 A bamboo material for making a violin bow, wherein the raw material is a 2m long bamboo trunk with a growth age of 4 years, a bamboo node spacing of 35-45cm, and a distance from the root of 1 to 3 meters; The preparation method comprises: (1) The felled tea bamboo is naturally shade-dried and cut into a specified length to obtain a dry bamboo tube (length 1 m; moisture content 15%); (2) subjecting the dried bamboo tube to oil extraction treatment (temperature 500°C, time 6 min) to obtain an oil-extracted bamboo tube; (3) Cut the oil-pulling bamboo tube into bamboo strips with a width of 1 cm along the radial direction; (4) trimming the bamboo strips (grinding the protrusions at the bamboo strips to make them smooth) and removing the glaze layer (removing a portion with a thickness of 0.1 cm on the surface of the bamboo strips) to obtain pretreated bamboo blocks; (5) Straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with uniform width and thickness (width 1 cm, thickness 3.5 mm, length 1 m); (6) The bamboo material is carbonized (temperature is 180°C, time is 20 min) to obtain a bamboo material for manufacturing a violin bow.

[0045] Bamboo material properties: density is 0.82g / cm 3 , the dynamic Young's modulus is 1.05×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 13700m / s.

[0046] Comparative Example 5 A bamboo material for making a violin bow, wherein the raw material is a green bamboo trunk (2m long) with a growth age of 4 years, a bamboo node spacing of 40-50cm, and a distance from the root of 1 to 3 meters; The preparation method comprises: the same as in Example 1; Bamboo material properties: density is 0.76g / cm 3 , the dynamic Young's modulus is 1.25×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 12100m / s.

[0047] Comparative Example 6 A bamboo material for making a violin bow, wherein the raw material is a 2m long bamboo trunk with a growth age of 4 years, a bamboo node spacing of 35-45cm, and a distance from the root of 1 to 3 meters; Preparation methods include: (without oil pulling) (1) The felled tea bamboo is naturally shade-dried and cut into a specified length to obtain a dry bamboo tube (length 1 m; moisture content 10%); (2) Cut the dried bamboo tube into strips with a width of 1 cm along the radial direction; (3) trimming the bamboo strips (grinding the protrusions at the bamboo strips to make them smooth) and removing the glaze layer (removing a portion with a thickness of 0.1 cm on the surface of the bamboo strips) to obtain pretreated bamboo blocks; (4) Straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with uniform width and thickness (width 1 cm, thickness 3.5 mm, length 1 m); (5) The bamboo material is carbonized (temperature is 180°C, time is 15 min) to obtain a bamboo material for manufacturing a violin bow.

[0048] Bamboo material properties: density is 0.83g / cm 3 , the dynamic Young's modulus is 1.15×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 9600m / s.

[0049] Comparative Example 7 A bamboo material for making a violin bow, wherein the raw material is a 2m long bamboo trunk with a growth age of 4 years, a bamboo node spacing of 35-45cm, and a distance from the root of 1 to 3 meters; The preparation method includes: (without carbonization treatment) (1) The felled tea bamboo is naturally shade-dried and cut into a specified length to obtain a dry bamboo tube (length 1 m; moisture content 10%); (2) subjecting the dried bamboo tube to oil extraction treatment (temperature 500°C, time 4 min) to obtain an oil-extracted bamboo tube; (3) Cut the oil-pulling bamboo tube into bamboo strips with a width of 1 cm along the radial direction; (4) trimming the bamboo strips (grinding the protrusions at the bamboo strips to make them smooth) and removing the glaze layer (removing a portion with a thickness of 0.1 cm on the surface of the bamboo strips) to obtain pretreated bamboo blocks; (5) Straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with uniform width and thickness (width 1 cm, thickness 3.5 mm, length 1 m); (6) Using bamboo as the material for making violin bows.

[0050] Bamboo material properties: density is 0.84g / cm 3 , the dynamic Young's modulus is 1.10×10 11 N / cm 2 The speed of sound transmission at normal temperature and pressure is 11600m / s.

[0051] Comparative Example 8 Brazilian wood bow material.

[0052] Experimental example: The bamboo materials prepared in Examples 1-5 and Comparative Examples 1-7 were stacked and spliced ​​(Figure 5 in the bamboo straight violin bow of Patent CN101477794A) to make bow rods and bow heads, and then made into violin bows; the Brazilian wood bow material in Comparative Example 8 was made into bows of the same size; the bows made of the materials in Examples 1-5 and Comparative Examples 1-8 were evaluated for tone, feel and satisfaction, and the evaluation results are shown in Table 2; Evaluation method: The evaluation team is composed of 10 professional violinists. The 10 evaluators received two evaluation trainings before the evaluation. They scored the violin bows according to the evaluation criteria (taking the average value). The specific evaluation reference criteria are shown in Table 1 below: Table 1 Evaluation scoring criteria Evaluation results: Table 2 Bow evaluation score results Serial number timbre Feel Satisfaction Total score Example 1 8.9 8.8 8.8 26.5 Example 2 8.7 8.5 8.6 25.8 Example 3 8.3 8.3 8.8 25.4 Example 4 8.6 8.7 8.9 26.2 Example 5 8.0 8.2 8.0 24.2 Comparative Example 1 7.4 5.8 6.5 19.7 Comparative Example 2 5.7 6.5 6.2 18.4 Comparative Example 3 6.3 6.7 6.5 19.5 Comparative Example 4 6.2 7.5 6.8 20.5 Comparative Example 5 5.3 7.8 6.2 17.0 Comparative Example 6 5.3 5.7 6.0 17.0 Comparative Example 7 5.7 5.6 5.8 17.1 Comparative Example 8 9.8 9.5 9.8 29.1 Analysis of the above evaluation results shows that the bamboo material for manufacturing violin bows of the present invention can significantly improve the timbre and other properties of bamboo through targeted selection of bamboo species, bamboo density, dynamic Young's modulus and sound velocity, as well as optimization of the preparation method, so that the performance of the violin bow made of this material is close to that of the Brazilian wood violin bow, and is suitable for replacing Brazilian wood in the preparation of violin bows.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bamboo material for making a bow, characterized in that: The bamboo material is a bamboo block made from tea stalk bamboo; and the density of the bamboo block is 0.75-0.85g / cm 3 , the dynamic Young's modulus is 1.2-2.0×10 11 N / cm 2 The sound conduction speed at normal temperature and pressure is 11000-15000m / s.

2. The bamboo material according to claim 1, characterized in that: The dynamic Young's modulus of the bamboo material is 1.4-1.8×10 11 N / cm 2 ;The sound conduction speed at normal temperature and pressure is 12000-13000m / s.

3. The bamboo material according to claim 1, characterized in that: The tea bamboo has a main trunk 1-4 meters away from the root, a growth age of 3-6 years, and a bamboo node spacing of 30-50cm.

4. The bamboo material according to claim 1, characterized in that: The water content of the bamboo material is 0.85-1.2%.

5. A method for preparing the bamboo material for manufacturing a violin bow according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) subjecting the felled tea bamboo to natural shade drying and cutting into predetermined lengths to obtain dried bamboo tubes; (2) extracting oil from the dried bamboo tube to obtain an oil-extracted bamboo tube; (3) Cutting the oil-pulling bamboo tube into bamboo strips along the axial direction; (4) trimming the bamboo strips and removing the glaze layer to obtain pre-treated bamboo blocks; (5) straightening and trimming the pretreated bamboo blocks to obtain bamboo materials with the same width and thickness; (6) The bamboo material is carbonized to obtain a bamboo material for manufacturing a violin bow.

6. The preparation method according to claim 5, characterized in that: In step (1), the moisture content of the tea stalk bamboo after natural shade drying is 8-13%.

7. The preparation method according to claim 5, characterized in that: In step (2), the oil pulling treatment temperature is 400-600°C and the time is 3-5 minutes.

8. The preparation method according to claim 5, characterized in that: In step (5), the straightening treatment method is: after heating the bent part of the bamboo block, straighten it with a straightening board to make the longitudinal fibers in the bamboo block straight; the heating temperature is 130-180°C and the heating time is 5-10s.

9. The preparation method according to claim 8, characterized in that: During the straightening process, the same part should not be heated more than twice.

10. The preparation method according to claim 5, characterized in that: In step (6), the temperature of the carbonization treatment is 150-200°C and the time is 12-18 minutes.

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