A production process of wooden guitar

Abstract

The invention relates to the technical field of guitar production, and more specifically to a production process of a wooden guitar. The internal damping of the guitar produced by the invention is smaller, and the responsiveness of the panel is greatly enhanced, so that the guitar produced by the invention has better acoustic quality. Furthermore, the invention uses a special primer to be sprayed on the surface of the guitar panel. The primer itself has a strong penetration force and can penetrate deep into the guitar panel, so that the primer can be firmly attached to the surface of the guitar panel, with strong adhesion, and the paint film is not easy to fall off. Furthermore, the combination of quartz powder and glass powder makes the paint film of the special primer sprayed on the surface of the guitar panel not only relatively flat and smooth, but also with a good mirror effect, so that the guitar itself has a good appearance. Moreover, the special primer itself also has good weather resistance and wear resistance, and the hardness of the paint film formed by it is relatively large, and the scratch resistance is also relatively outstanding.

Description

Technical Field

[0001] The invention relates to the technical field of guitar production, and more particularly to a production process of a wooden guitar. Background Art

[0002] The guitar is also translated as a six-string guitar. Its top and back are flat, and the waist of the guitar is generally concave without corners. Classical guitars generally have no concave. The neck is very wide and long, and there is a string nut on the fingerboard and many narrow and slightly upward protruding metal horizontal grids, called "frets", which divide the strings into many semitones.

[0003] As a member of the stringed instrument family, the guitar is a stringed instrument that produces sound by plucking the strings one by one. When playing, you pluck the strings with one hand and press the fingers of the other hand against the fretboard, which is a small metal strip covering the neck of the guitar. The sound produced by the plucking is amplified by the guitar's resonance box.

[0004] At present, the internal damping of guitars produced by existing processes is relatively large, so their acoustic quality is relatively poor. In addition, the surface of guitars needs to be sprayed with primer during production, but although the primer currently available on the market can cover up the natural texture of the wood and present a certain mirror effect, the appearance, impact resistance, adhesion and pencil hardness of the paint film are relatively poor, which need to be improved. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a production process for wooden guitars, which has the advantages that: the internal damping of the guitar produced by the present invention is smaller, and the responsiveness of the panel is also greatly enhanced, so that the guitar produced by the present invention has better acoustic quality; furthermore, the appearance, impact resistance, adhesion and pencil hardness of the paint film of the special primer produced by the present invention are better than those of commercially available primers, which not only ensures the quality of the guitar, but also effectively extends the service life of the guitar.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A production process for a wooden guitar comprises the following steps:

[0008] S1. Select spruce wood to make the guitar panel, walnut wood to make the guitar side panel and back panel, and mahogany wood to make the guitar handle; place the panel in a microwave drying device and dry it under oxygen-free conditions at a temperature of 160-180°C until its moisture content is 5-7%; then dry the side panel and back panel separately until the moisture content is 5-7%; store them separately for future use;

[0009] S2. Draw the outlines of the guitar top, side panels and back panel on the spruce board and walnut board respectively, and cut the blanks of the top panel, side panels and back panel along the 4-6 mm outside of the outline with a cutter; at the same time, cut the mahogany into the shape of the handle; and grind the guitar top, side panels, back panel and handle respectively by existing technology;

[0010] S3. Draw the sound beam position lines on the front and back panels, then apply glue to the sound beams, stick them on the corresponding sound beam position lines and press them tightly with elastic support wood. After completing the installation of all the sound beams, polish the tip of the sound beam to make it smooth and round. The thickness of the sound beam close to the edge of the sound barrel is between 1.5-2 mm.

[0011] S4. Align the top or back panel to the center of the barrel shape, use a pencil to mark the position of the sound beam on the inner side of the side panel, and use a cutter to mill off the marked part on the inner side of the side panel, and ensure that the size of the cut on the inner side of the side panel matches the thickness of the sound beam edge; then use a woodworking chisel to trim the two ends of the sound beam so that it enters the cut on the inner side of the side panel; then use glue to bond and assemble the top, back and side panels, and then inlay and hem the edge of the guitar barrel. After hem hemming is completed, assemble the guitar barrel and the guitar handle, and then install the adjustment rod, guitar fingerboard and handle trimming;

[0012] S5. Cut the Indian rosewood according to the drawing and cut the frets. Bind the sides with PVC. Determine the position of the bridge according to the effective string distance of the fingerboard. Install the bridge and fingerboard handle by gluing. Then polish the handle, neck and sound box respectively.

[0013] S6. Transfer the guitar to the spray room and perform fully automated electrostatic spraying on its surface. The paints used include special primer, medium paint and topcoat. When spraying, keep the distance between the paint gun and the guitar body at 15-20mm. Each time the paint is polished, it should match the last one-third of the paint. The paint should be sprayed evenly without dripping. After spraying the special primer and medium paint, the paint layer needs to be dried and polished respectively. After spraying the topcoat, it needs to be dried, polished and polished.

[0014] S7. Drill a hole in the guitar side panel according to the size of the pickup controller so that it can fit perfectly into the side panel, and then fix it with screws. Install the sensor under the lower bridge so that the entire lower bridge is in uniform contact with the sensor. Connect the sensor to the controller through wires. Install the audio jack on the side panel at the end of the guitar. Fix it with screws after drilling a hole, and complete the installation of other components to get the finished guitar.

[0015] By adopting the above technical solution: the present invention heat treats the guitar panel through microwave drying equipment, and controls its moisture content at 5-7% under anaerobic conditions, so that part of the hemicellulose inside the guitar panel is degraded, and the hydrophilic structure such as hydroxyl group is reduced, thereby increasing the crystallization ratio inside the panel, significantly reducing the internal damping (about 30-35%), and greatly reducing the heat loss. The responsiveness of the panel is also greatly enhanced, so that the guitar produced by the present invention has better acoustic quality. And the dimensional stability and strength of the guitar panel are also significantly enhanced. In addition, the formic acid and phenolic compounds released by the guitar panel during the drying process can slow down its decay rate to extend its service life.

[0016] The present invention is further configured as follows: when pasting the sound beams in S3, the glue overflowed due to pressure needs to be cleaned immediately after the pasting process of each sound beam is completed, so that the board surface is clean.

[0017] By adopting the above technical solution: the overflowed glue can be cleaned through the above treatment to ensure the neatness of the guitar panel surface, which is also beneficial to the subsequent processing.

[0018] The present invention is further configured as follows: during the polishing process in S5, a woodworking file is first used, and then 200-mesh sandpaper, 500-mesh sandpaper and 900-mesh sandpaper are used in sequence to polish the guitar handle, guitar neck and sound box.

[0019] By adopting the above technical solution: firstly, the surface of the neck, neck and sound box is roughly polished by woodworking file to achieve preliminary surface treatment. Then, the neck, neck and sound box are finely polished by sandpaper of different specifications, thereby ensuring the quality and fineness of polishing.

[0020] The present invention is further configured as follows: the special primer in S6 is made of the following raw materials by weight: 50-70 parts of water-based acrylic resin emulsion, 5-7 parts of sodium alkyl sulfosuccinate, 3-5 parts of organic bentonite, 5-8 parts of quartz powder, 4-6 parts of glass powder, 6-8 parts of tung oil, 10-15 parts of glycerol, 14-20 parts of additives, 2-4 parts of wetting agent, 12-16 parts of defoamer, 2-4 parts of dispersant and 7-10 parts of distilled water;

[0021] The preparation method is as follows: water-based acrylic resin emulsion, additives, wetting agents, sodium alkyl succinate sulfonate, defoaming agents and organic bentonite are respectively put into a reactor, mixed and stirred evenly, the temperature of the reactor is increased to 40-50°C, and then quartz powder and glass powder are respectively ground into fine powders with a particle size of 200-300 meshes, and the powders are put into the reactor with other raw materials, and ultrasonically mixed for 15-30 minutes at the above temperature; after mixing, the mixed components obtained in the reactor are the finished special primer product.

[0022] By adopting the above technical solution: the present invention uses a special primer to spray on the surface of the guitar panel. The primer itself has a strong penetrating force and can penetrate deep into the guitar panel, so that the primer can be firmly attached to the surface of the guitar panel, with strong adhesion, and the paint film is not easy to fall off. Furthermore, the combination of quartz powder and glass powder makes the special primer sprayed on the surface of the guitar panel not only relatively flat and smooth, but also has a good mirror effect, so that the guitar itself has a good appearance; and the special primer itself also has good weather resistance and wear resistance, and the paint film formed is also relatively hard, and the scratch resistance is also relatively outstanding.

[0023] The present invention is further configured as follows: the additive is any one of nano barium sulfate, talcum powder or nano silicon dioxide.

[0024] By adopting the above technical solution, the use of additives can not only effectively improve the wear resistance of the prepared special primer, but also effectively improve its weather resistance, thereby extending the service life of the special primer.

[0025] The present invention is further configured as follows: the wetting agent is selected from any one of sodium polyphosphate and barium octadecanoate.

[0026] By adopting the above technical solution, the use of the wetting agent can make the solid raw materials in the special primer prepared by the present invention more easily wetted by water, so that the quality of the prepared special primer is more uniform, and the quality of the prepared special primer is effectively guaranteed.

[0027] The present invention is further configured as follows: the defoaming agent is selected from any one of polyether-modified siloxane and emulsified silicone oil.

[0028] By adopting the above technical solution: the use of defoaming agent can reduce the surface tension of the special primer, prevent the formation of bubbles in the special primer, or reduce or burst the original bubbles. It ensures that the quality of the paint film will not be affected by bubbles when spraying the special primer. It also effectively guarantees the spraying quality of the special primer.

[0029] The present invention is further configured as follows: the dispersant is selected from any one of polyethylene glycol and sodium dodecyl sulfate.

[0030] By adopting the above technical solution: the use of dispersant can not only uniformly disperse the solid particles and liquid particles in the special primer raw materials that are difficult to dissolve in liquid, but also effectively prevent the sedimentation and agglomeration of solid particles in the special primer, so as to form a uniform mixed component.

[0031] The present invention is further configured such that when the mixed components in the reaction kettle are ultrasonically mixed, the frequency of the ultrasonic mixing is set to 30-40 kHz.

[0032] By adopting the above technical solution: by performing ultrasonic mixing treatment on the mixed components, not only can the raw materials be evenly distributed in the mixed components, but also the bubbles in the mixed components can be effectively driven out, thereby ensuring the quality of the special primer.

[0033] In summary, the present invention has the following advantages:

[0034] 1. The present invention heat treats the guitar panel through microwave drying equipment, and controls its moisture content at 5-7% under anaerobic conditions, so that part of the hemicellulose inside the guitar panel is degraded, and the hydrophilic structure such as hydroxyl group is reduced, thereby increasing the crystallization ratio inside the panel, significantly reducing the internal damping (about 30-35%), and greatly reducing the heat loss. The responsiveness of the panel is also greatly enhanced, so that the guitar produced by the present invention has better acoustic quality. The dimensional stability and strength of the guitar panel are also significantly enhanced. In addition, the formic acid and phenolic compounds released by the guitar panel during the drying process can slow down its decay rate to extend its service life.

[0035] 2. The present invention uses a special primer to spray on the surface of the guitar panel. The primer itself has a strong penetrating power and can penetrate deep into the guitar panel, so that the primer can be firmly attached to the surface of the guitar panel, with strong adhesion and the paint film is not easy to fall off. Furthermore, the combination of quartz powder and glass powder makes the paint film of the special primer sprayed on the surface of the guitar panel not only relatively flat and smooth, but also with a good mirror effect, so that the guitar itself has a good appearance; and the special primer itself also has good weather resistance and wear resistance, and the paint film formed is also relatively hard and has outstanding scratch resistance. DETAILED DESCRIPTION

[0036] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] A production process for a wooden guitar comprises the following steps:

[0039] S1. Select spruce wood to make the guitar panel, walnut wood to make the guitar side panel and back panel, and mahogany wood to make the guitar handle; place the panel in a microwave drying device and dry it under oxygen-free conditions at a temperature of 160° C. until its moisture content is 5%; then dry the side panel and back panel separately until their moisture content is 5%; store them separately for future use;

[0040] S2. Draw the outlines of the guitar top, side panels and back panel on the spruce board and walnut board respectively, and cut the blanks of the top panel, side panels and back panel 4 mm outside the outline with a cutter; at the same time, cut the mahogany wood into the shape of the handle; and grind the guitar top, side panels, back panel and handle respectively by existing technology;

[0041] S3. Draw the sound beam position line on the front and back panels, then apply glue to the sound beam, stick it on the corresponding sound beam position line and press it with elastic support wood. After completing the installation of all the sound beams, polish the tip of the sound beam to make it smooth and round. The thickness of the sound beam close to the edge of the sound barrel is between 1.5 mm.

[0042] S4. Align the top or back panel to the center of the barrel shape, use a pencil to mark the position of the sound beam on the inner side of the side panel, and use a cutter to mill off the marked part on the inner side of the side panel, and ensure that the size of the cut on the inner side of the side panel matches the thickness of the sound beam edge; then use a woodworking chisel to trim the two ends of the sound beam so that it enters the cut on the inner side of the side panel; then use glue to bond and assemble the top, back and side panels, and then inlay and hem the edge of the guitar barrel. After hem hemming is completed, assemble the guitar barrel and the guitar handle, and then install the adjustment rod, guitar fingerboard and handle trimming;

[0043] S5. Cut the Indian rosewood according to the drawing and cut the frets. Bind the sides with PVC. Determine the position of the bridge according to the effective string distance of the fingerboard. Install the bridge and fingerboard handle by gluing. Then polish the handle, neck and sound box respectively.

[0044] S6. Transfer the guitar to the spray room and perform fully automated electrostatic spraying on its surface. The paints used include special primer, medium paint and topcoat. When spraying, keep the distance between the paint gun and the guitar body at 15mm. Each time the paint is polished, it should match the last one-third of the paint. The paint should be sprayed evenly without dripping. After spraying the special primer and medium paint, the paint layer needs to be dried and polished respectively. After spraying the topcoat, it needs to be dried, polished and polished.

[0045] S7. Drill a hole in the guitar side panel according to the size of the pickup controller so that it can fit perfectly into the side panel, and then fix it with screws. Install the sensor under the lower bridge so that the entire lower bridge is in uniform contact with the sensor. Connect the sensor to the controller through wires. Install the audio jack on the side panel at the end of the guitar. Fix it with screws after drilling a hole, and complete the installation of other components to get the finished guitar.

[0046] When pasting the sound beams in S3, the glue overflowed due to pressure must be cleaned immediately after each sound beam is pasted to make the board surface clean.

[0047] During the sanding process in S5, first use a woodworking file, then use 200-grit sandpaper, 500-grit sandpaper, and 900-grit sandpaper to sand the neck, neck, and sound box.

[0048] The special primer in S6 is made of the following raw materials by weight: 50 parts of water-based acrylic resin emulsion, 5 parts of sodium alkyl sulfosuccinate, 3 parts of organic bentonite, 5 parts of quartz powder, 4 parts of glass powder, 6 parts of tung oil, 10 parts of glycerol, 14 parts of additives, 2 parts of wetting agent, 12 parts of defoamer, 2 parts of dispersant and 7 parts of distilled water;

[0049] The preparation method is as follows: water-based acrylic resin emulsion, additives, wetting agents, sodium alkyl sulfonate succinate, defoaming agents and organic bentonite are respectively put into a reactor, mixed and stirred evenly, the temperature of the reactor is increased to 40°C, and then quartz powder and glass powder are respectively ground into fine powder with a particle size of 200 meshes, and the powders and other raw materials are respectively put into the reactor, and ultrasonically mixed for 15-30 minutes at the above temperature; after mixing, the mixed components obtained in the final reactor are the finished special primer product.

[0050] The additive is nano barium sulfate.

[0051] Sodium polyphosphate is selected as the wetting agent.

[0052] The defoaming agent is polyether modified siloxane.

[0053] Polyethylene glycol was selected as the dispersant.

[0054] When the mixed components in the reactor are ultrasonically mixed, the frequency of the ultrasonic mixing is set to 30 kHz.

[0055] Embodiment 2:

[0056] A production process for a wooden guitar comprises the following steps:

[0057] S1. Select spruce wood to make the guitar panel, walnut wood to make the guitar side panel and back panel, and mahogany wood to make the guitar handle; place the panel in a microwave drying device and dry it under oxygen-free conditions at a temperature of 170° C. until its moisture content is 6%; then dry the side panel and back panel separately until their moisture content is 6%; store them separately for future use;

[0058] S2. Draw the outlines of the guitar top, side panels and back panel on the spruce board and walnut board respectively, and cut the blanks of the top panel, side panels and back panel 5 mm outside the outline with a cutter; at the same time, cut the mahogany wood into the shape of the handle; and grind the guitar top, side panels, back panel and handle respectively by existing technology;

[0059] S3. Draw the sound beam position line on the front and back panels, then apply glue to the sound beam, stick it on the corresponding sound beam position line and press it with elastic support wood. After completing the installation of all the sound beams, polish the tip of the sound beam to make it smooth and round. The thickness of the sound beam close to the edge of the sound barrel is between 1.8 mm;

[0060] S4. Align the top or back panel to the center of the barrel shape, use a pencil to mark the position of the sound beam on the inner side of the side panel, and use a cutter to mill off the marked part on the inner side of the side panel, and ensure that the size of the cut on the inner side of the side panel matches the thickness of the sound beam edge; then use a woodworking chisel to trim the two ends of the sound beam so that it enters the cut on the inner side of the side panel; then use glue to bond and assemble the top, back and side panels, and then inlay and hem the edge of the guitar barrel. After hem hemming is completed, assemble the guitar barrel and the guitar handle, and then install the adjustment rod, guitar fingerboard and handle trimming;

[0061] S5. Cut the Indian rosewood according to the drawing and cut the frets. Bind the sides with PVC. Determine the position of the bridge according to the effective string distance of the fingerboard. Install the bridge and fingerboard handle by gluing. Then polish the handle, neck and sound box respectively.

[0062] S6. Transfer the guitar to the spray room and perform fully automated electrostatic spraying on its surface. The paints used include special primer, medium paint and topcoat. When spraying, keep the distance between the paint gun and the guitar body at 18mm. Each time the paint is polished, it should match the last one-third of the paint. The paint should be sprayed evenly without dripping. After spraying the special primer and medium paint, the paint layer needs to be dried and polished respectively. After spraying the topcoat, it needs to be dried, polished and polished.

[0063] S7. Drill a hole in the guitar side panel according to the size of the pickup controller so that it can fit perfectly into the side panel, and then fix it with screws. Install the sensor under the lower bridge so that the entire lower bridge is in uniform contact with the sensor. Connect the sensor to the controller through wires. Install the audio jack on the side panel at the end of the guitar. Fix it with screws after drilling a hole, and complete the installation of other components to get the finished guitar.

[0064] When pasting the sound beams in S3, the glue overflowed due to pressure must be cleaned immediately after each sound beam is pasted to make the board surface clean.

[0065] During the sanding process in S5, first use a woodworking file, then use 200-grit sandpaper, 500-grit sandpaper, and 900-grit sandpaper to sand the neck, neck, and sound box.

[0066] The special primer in S6 is made of the following raw materials by weight: 60 parts of water-based acrylic resin emulsion, 6 parts of sodium alkyl sulfosuccinate, 4 parts of organic bentonite, 7 parts of quartz powder, 5 parts of glass powder, 7 parts of tung oil, 13 parts of glycerol, 16 parts of additives, 3 parts of wetting agent, 14 parts of defoaming agent, 3 parts of dispersant and 8 parts of distilled water;

[0067] The preparation method is as follows: water-based acrylic resin emulsion, additives, wetting agents, sodium alkyl sulfonate succinate, defoaming agents and organic bentonite are respectively put into a reactor, mixed and stirred evenly, the temperature of the reactor is increased to 45°C, and then quartz powder and glass powder are respectively ground into fine powder with a particle size of 250 mesh, and the powders and other raw materials are respectively put into the reactor, and ultrasonically mixed for 25 minutes at the above temperature; after mixing, the mixed components obtained in the final reactor are the finished special primer product.

[0068] The additive is talc.

[0069] The wetting agent is barium octadecanoate.

[0070] The defoaming agent is emulsified silicone oil.

[0071] Sodium dodecyl sulfate was selected as the dispersant.

[0072] When the mixed components in the reactor are ultrasonically mixed, the frequency of the ultrasonic mixing is set to 35 kHz.

[0073] Embodiment 3:

[0074] A production process for a wooden guitar comprises the following steps:

[0075] S1. Select spruce wood to make the guitar panel, walnut wood to make the guitar side panel and back panel, and mahogany wood to make the guitar handle; place the panel in a microwave drying device and dry it under oxygen-free conditions at a temperature of 180° C. until its moisture content is 7%; then dry the side panel and back panel separately until their moisture content is 7%; store them separately for future use;

[0076] S2. Draw the outlines of the guitar top, side panels and back panel on the spruce board and walnut board respectively, and cut the blanks of the top panel, side panels and back panel along 6 mm outside the outline with a cutter; at the same time, cut the mahogany wood into the shape of the handle; and grind the guitar top, side panels, back panel and handle respectively by existing technology;

[0077] S3. Draw the sound beam position line on the front and back panels, then apply glue to the sound beam, stick it on the corresponding sound beam position line and press it with elastic support wood. After completing the installation of all the sound beams, polish the tip of the sound beam to make it smooth and round. The thickness of the sound beam close to the edge of the sound barrel is between 2 mm.

[0078] S4. Align the top or back panel to the center of the barrel shape, use a pencil to mark the position of the sound beam on the inner side of the side panel, and use a cutter to mill off the marked part on the inner side of the side panel, and ensure that the size of the cut on the inner side of the side panel matches the thickness of the sound beam edge; then use a woodworking chisel to trim the two ends of the sound beam so that it enters the cut on the inner side of the side panel; then use glue to bond and assemble the top, back and side panels, and then inlay and hem the edge of the guitar barrel. After hem hemming is completed, assemble the guitar barrel and the guitar handle, and then install the adjustment rod, guitar fingerboard and handle trimming;

[0079] S5. Cut the Indian rosewood according to the drawing and cut the frets. Bind the sides with PVC. Determine the position of the bridge according to the effective string distance of the fingerboard. Install the bridge and fingerboard handle by gluing. Then polish the handle, neck and sound box respectively.

[0080] S6. Transfer the guitar to the spray room and perform fully automated electrostatic spraying on its surface. The paints used include special primer, medium paint and topcoat. When spraying, keep the distance between the paint gun and the guitar body at 20mm. Each time the paint is polished, it should match the last one-third of the paint. The paint should be sprayed evenly without dripping. After spraying the special primer and medium paint, the paint layer needs to be dried and polished respectively. After spraying the topcoat, it needs to be dried, polished and polished.

[0081] S7. Drill a hole in the guitar side panel according to the size of the pickup controller so that it can fit perfectly into the side panel, and then fix it with screws. Install the sensor under the lower bridge so that the entire lower bridge is in uniform contact with the sensor. Connect the sensor to the controller through wires. Install the audio jack on the side panel at the end of the guitar. Fix it with screws after drilling a hole, and complete the installation of other components to get the finished guitar.

[0082] When pasting the sound beams in S3, the glue overflowed due to pressure must be cleaned immediately after each sound beam is pasted to make the board surface clean.

[0083] During the sanding process in S5, first use a woodworking file, then use 200-grit sandpaper, 500-grit sandpaper, and 900-grit sandpaper to sand the neck, neck, and sound box.

[0084] The special primer in S6 is made of the following raw materials by weight: 70 parts of water-based acrylic resin emulsion, 7 parts of sodium alkyl sulfosuccinate, 5 parts of organic bentonite, 8 parts of quartz powder, 6 parts of glass powder, 8 parts of tung oil, 15 parts of glycerol, 20 parts of additives, 4 parts of wetting agent, 16 parts of defoamer, 4 parts of dispersant and 10 parts of distilled water;

[0085] The preparation method is as follows: water-based acrylic resin emulsion, additives, wetting agents, sodium alkyl sulfonate succinate, defoaming agents and organic bentonite are respectively put into a reactor, mixed and stirred evenly, the temperature of the reactor is increased to 50°C, and then quartz powder and glass powder are respectively ground into fine powder with a particle size of 300 meshes, and the powders and other raw materials are respectively put into the reactor, and ultrasonically mixed for 30 minutes at the above temperature; after mixing, the mixed components obtained in the final reactor are the finished special primer product.

[0086] The additive is nano silicon dioxide.

[0087] Sodium polyphosphate is selected as the wetting agent.

[0088] The defoaming agent is polyether modified siloxane.

[0089] Polyethylene glycol was selected as the dispersant.

[0090] When the mixed components in the reactor are ultrasonically mixed, the frequency of the ultrasonic mixing is set to 40 kHz.

[0091] Performance Test:

[0092] The paint films on the surface of guitars sprayed with the special primers produced in Examples 1-3 of the present invention (Examples 1-3) and the paint films on the surface of guitars sprayed with commercially available primers (Comparative Example) were tested for performance, and the results are recorded in the following table:

[0093] 1. Appearance test of paint film: Observe the flatness of the paint film surface by visual inspection.

[0094] 2. Adhesion test: It is measured according to GB / T1720-1989 "Determination of adhesion of paint films", in which adhesion is divided into seven levels, the best adhesion is level one, and the worst adhesion is level seven.

[0095] 3. Impact resistance test: Determined according to GB / T1732-1993 "Determination of impact resistance of paint films".

[0096] 4. Pencil hardness test: Determined according to GB / T6739-2006 "Determination of paint film hardness".

[0097] Group Primer film appearance Impact resistance / cm Adhesion / Grade Pencil hardness Example 1 Smooth and flat, no shrinkage holes 76 1 4H Example 2 Smooth and flat, no shrinkage holes 78 1 4H Example 3 Smooth and flat, no shrinkage holes 74 1 4H Comparative Example The surface has a granular feel and shrinkage 65 2 2H

[0098] From the relevant data in the above table, it can be seen that when the special primer prepared by the present invention is sprayed on the surface of the guitar, the appearance, impact resistance, adhesion and pencil hardness of the paint film produced are significantly better than those of the commercially available primers. This shows that the quality of the special primer provided by the present invention is better than that of the existing primers. At the same time, the internal damping of the guitar produced by the present invention is smaller, and the responsiveness of the panel is also greatly enhanced, so that the guitar produced by the present invention has better acoustic quality.

[0099] 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, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A production process for a wooden guitar, characterized in that: The following steps are involved: S1. Select spruce wood to make the guitar panel, walnut wood to make the guitar side panel and back panel, and mahogany wood to make the guitar handle; place the panel in a microwave drying device and dry it under oxygen-free conditions at a temperature of 160-180°C until its moisture content is 5-7%; then dry the side panel and back panel separately until the moisture content is 5-7%; store them separately for future use; S2. Draw the outlines of the guitar top, side panels and back panel on the spruce board and walnut board respectively, and cut the blanks of the top panel, side panels and back panel along the 4-6 mm outside of the outline with a cutter; at the same time, cut the mahogany into the shape of the handle; and grind the guitar top, side panels, back panel and handle respectively by existing technology; S3. Draw the sound beam position lines on the front and back panels, then apply glue to the sound beams, stick them on the corresponding sound beam position lines and press them tightly with elastic support wood. After completing the installation of all the sound beams, polish the tip of the sound beam to make it smooth and round. The thickness of the sound beam close to the edge of the sound barrel is between 1.5-2 mm. S4. Align the top or back panel to the center of the barrel shape, use a pencil to mark the position of the sound beam on the inner side of the side panel, and use a cutter to mill off the marked part on the inner side of the side panel, and ensure that the size of the cut on the inner side of the side panel matches the thickness of the sound beam edge; then use a woodworking chisel to trim the two ends of the sound beam so that it enters the cut on the inner side of the side panel; then use glue to bond and assemble the top, back and side panels, and then inlay and hem the edge of the guitar barrel. After hem hemming is completed, assemble the guitar barrel and the guitar handle, and then install the adjustment rod, guitar fingerboard and handle trimming; S5. Cut the Indian rosewood according to the drawing and cut the frets. Bind the sides with PVC. Determine the position of the bridge according to the effective string distance of the fingerboard. Install the bridge and fingerboard handle by gluing. Then polish the handle, neck and sound box respectively. S6. Transfer the guitar to the spray room and perform fully automated electrostatic spraying on its surface. The paints used include special primer, medium paint and topcoat. When spraying, keep the distance between the paint gun and the guitar body at 15-20mm. Each time the paint is polished, it should match the last one-third of the paint. The paint should be sprayed evenly without dripping. After spraying the special primer and medium paint, the paint layer needs to be dried and polished respectively. After spraying the topcoat, it needs to be dried, polished and polished. S7. Drill a hole in the guitar side panel according to the size of the pickup controller so that it can fit perfectly into the side panel, and then use screws to fix it. Install the sensor under the lower bridge so that the entire lower bridge is in uniform contact with the sensor. Connect the sensor to the controller through wires. Install the audio jack on the side panel at the end of the guitar, and use screws to fix it after drilling a hole. Install other components to get the finished guitar. The special primer in S6 is made of the following raw materials by weight: 50-70 parts of water-based acrylic resin emulsion, 5-7 parts of sodium alkyl sulfosuccinate, 3-5 parts of organic bentonite, 5-8 parts of quartz powder, 4-6 parts of glass powder, 6-8 parts of tung oil, 10-15 parts of glycerol, 14-20 parts of additives, 2-4 parts of wetting agent, 12-16 parts of defoamer, 2-4 parts of dispersant and 7-10 parts of distilled water; The preparation method is as follows: water-based acrylic resin emulsion, additives, wetting agents, sodium alkyl succinate sulfonate, defoaming agents and organic bentonite are respectively put into a reactor, mixed and stirred evenly, the temperature of the reactor is increased to 40-50°C, and then quartz powder and glass powder are respectively ground into fine powders with a particle size of 200-300 meshes, and the powders are put into the reactor with other raw materials, and ultrasonically mixed for 15-30 minutes at the above temperature; after mixing, the mixed components obtained in the final reactor are the finished special primer product.

2. The production process of a wooden guitar according to claim 1, characterized in that: When the sound beams are pasted in S3, the glue overflowed due to pressure needs to be cleaned immediately after the pasting process of each sound beam is completed, so that the board surface is clean.

3. The production process of a wooden guitar according to claim 1, characterized in that: During the polishing process in S5, a woodworking file is first used, and then 200-grit sandpaper, 500-grit sandpaper and 900-grit sandpaper are used in sequence to polish the guitar handle, guitar neck and sound box.

4. The production process of a wooden guitar according to claim 1, characterized in that: The additive is any one of nano barium sulfate, talcum powder or nano silicon dioxide.

5. The production process of a wooden guitar according to claim 1, characterized in that: The wetting agent is selected from any one of sodium polyphosphate and barium octadecanoate.

6. The production process of a wooden guitar according to claim 1, characterized in that: The defoamer is selected from any one of polyether-modified siloxane and emulsified silicone oil.

7. The production process of a wooden guitar according to claim 1, characterized in that: The dispersant is selected from any one of polyethylene glycol and sodium dodecyl sulfate.

8. The production process of a wooden guitar according to claim 1, characterized in that: When the mixed components in the reactor are ultrasonically mixed, the frequency of the ultrasonic mixing is set to 30-40 kHz.