WO2019114485A1 - Guitar, guitar molded body, panel sound beam and preparation method therefor - Google Patents

Abstract

Disclosed are a guitar, a guitar molded body, a panel sound beam and a preparation method therefor, which relate to the field of guitar preparation. The guitar molded body comprises a back plate, a side plate and a neck of the guitar, and the guitar molded body, the panel and the sound beam are prepared from a raw material—a carbon fiber reinforced composite material, and are integrally formed by means of injection molding technology. The carbon fiber reinforced composite material comprises, in parts by weight: 20 - 80 parts of an acrylonitrile-butadiene-styrene copolymer, 15 - 35 parts of carbon fibers and 5 - 30 parts of an acrylonitrile-styrene copolymer. The guitar molded body can be bonded with the panel and the sound beam to form a complete guitar, thereby greatly improving guitar production efficiency; the prepared guitar has a better tone quality, with both the volume and acoustical performance thereof being higher than those of a wooden guitar; and the guitar can be directly played without the need for energizing same.

Description

Guitar, guitar type body, panel sound beam and preparation method thereof

Cross-reference to related applications

This application claims the application number of the Chinese Patent Office on December 12, 2017 as 201711315232.6, the name is "a guitar, guitar type and its preparation method", and the application number is 201711315234.5, the name is "a guitar, panel" The priority of the Chinese Patent Application for the Sound Beam and Its Preparation Method is hereby incorporated by reference in its entirety.

Technical field

The present application relates to the field of guitar preparation, and in particular to a guitar, a guitar type, a panel sound beam, and a method of manufacturing the same.

Background technique

Currently, there are two main types of guitars on the market, wooden guitars and plastic guitars. Among them, wooden guitars are usually hand-machined with specific wood to obtain major parts, such as backboards, panels, side panels, sound beams and necks, and then glued together to make the major components hand-bonded. The processing of this wooden guitar requires nearly 200 processes, and the processing technology is cumbersome; and specific wood is required to meet the sound quality requirements of the guitar. For example, the most commonly used material for making panels is spruce, and the quality of the panels produced is different; The back and side panels need to be hard and strong, so the commonly used woods are Brazilian rosewood, African rosewood, etc.; mahogany and maple are the most common neck wood; most of the acoustic guitar fingerboard materials use ebony or rosewood. . As a result, the production efficiency of wooden guitars is low, the price is high, and the consistency of product quality is poor. In addition, because the wood is affected by the weather, too much moisture and too dry will make the acoustic guitar deformed, even a slight deformation will affect the sound quality of the guitar.

The plastic guitars are basically electric guitars, which need to be played under the premise of power-on, otherwise the guitar will not make a sound. Due to the influence of other preparation materials on the sound quality and volume, the existing thermoplastic materials are difficult to meet the needs of manufacturing guitars in terms of mechanical strength, specific strength and flexibility. As a result, there is currently no plastic guitar that is made of thermoplastic materials and can be played directly without power.

Summary of the invention

A first object of the present application is to provide a guitar type body and a panel sound beam. The guitar type body is an integrally formed component of a back plate, a side plate and a neck. The panel sound beam is an integrally formed component, a back plate and a side plate. The neck and the neck can be combined with the panel and the sound beam to form a complete guitar, which greatly improves the efficiency of the guitar.

A second object of the present application is to provide a method for preparing a guitar type body and a panel sound beam. The preparation method can obtain an integral part of a guitar back plate, a side plate and a neck, and a panel sound beam integrally formed by an injection molding process. The component has simple preparation method, short production cycle and high production efficiency.

A third object of the present application is to provide a guitar including the above-mentioned guitar type body and the above-mentioned panel sound beam, which has better sound quality, and has higher volume and acoustic performance than a wooden guitar, and can be directly used without power supply. Play.

In order to achieve the above object of the present application, the following technical solutions are adopted:

A guitar body preparation method, the guitar body comprises a back plate, a side plate and a neck of a guitar, and the guitar body is made of a carbon fiber composite reinforcing material as a raw material and integrally formed by an injection molding process;

The carbon fiber-reinforced composite material comprises, by weight, 20 to 80 parts of an acrylonitrile-butadiene-styrene copolymer, 15 to 35 parts of carbon fibers, and 5 to 30 parts of an acrylonitrile-styrene copolymer.

In the injection molding process of the above guitar type, a gas-assisted injection molding process is adopted, in which nitrogen or an inert gas is used as an auxiliary gas, and the gas auxiliary pressure is 200 to 350 MPa.

The above injection molding process comprises: melting the raw material at 160 to 200 ° C, and holding it at 230 to 270 ° C, and then spraying it into a guitar-shaped mold having a temperature of 70 to 120 ° C for injection molding.

The injection pressure in the above injection molding process is 60 to 90%, and the total molding time is 240 to 280 s.

The above-mentioned guitar type is prepared by an injection molding machine, and the clamping force of the above injection molding machine is 800 to 1400 tons, and the injection temperature setting of the above injection molding machine includes: 160 to 200 ° C in the T1 zone and 230 to 270 ° C in the T2 zone. The T3 zone is 230-270 ° C, the T4 zone is 230-270 ° C, and the nozzle zone is 240-280 ° C; the injection pressure setting includes: 60-90% of the P1 zone, 60-90% of the P2 zone, and 60-60 of the P3 zone. 90%, P4 zone is 60-90%, the total pressure is 140kgf/cm ² ; injection speed setting includes: V1 zone is 20-50%, V2 zone is 40-80%, V3 zone is 50-90%, V4 The area is 10 to 40%, and the total speed is 120 to 150 mm/s.

The carbon fibers are chopped carbon fibers, and the chopped carbon fibers have a particle diameter of 5 to 10 μm.

The number average molecular weight of the above acrylonitrile-styrene copolymer is from 18,000 to 22,000.

The above carbon fiber reinforced composite material further comprises 0.2 to 0.6 parts by weight of the antioxidant and 0.4 to 0.8 parts by weight of the lubricant.

A guitar type obtained by the above preparation method.

A guitar comprising the above guitar body.

A method for preparing a panel sound beam of a guitar, wherein the panel and the sound beam of the guitar are made of a carbon fiber composite reinforcing material as a raw material, and are integrally formed by an injection molding process;

The carbon fiber-reinforced composite material comprises, by weight, 20 to 80 parts of an acrylonitrile-butadiene-styrene copolymer, 15 to 35 parts of carbon fibers, and 5 to 30 parts of an acrylonitrile-styrene copolymer.

In the injection molding process of the above-mentioned panel sound beam, a gas-assisted injection molding process is adopted, in which nitrogen or an inert gas is used as an auxiliary gas, and the gas auxiliary pressure is 200 to 350 MPa.

The above injection molding process comprises: melting the raw material at 160 to 230 ° C, and tempering at 230 to 270 ° C, and then spraying to a panel sound beam mold having a temperature of 70 to 120 ° C for injection molding.

The injection pressure in the above injection molding process is 60 to 90%, and the total molding time is 100 to 140 s.

The above-mentioned panel sound beam is prepared by an injection molding machine, and the clamping force of the above injection molding machine is 600 to 1000 tons, and the injection temperature setting of the above injection molding machine includes: 160 to 200 ° C in the T1 zone and 230 to 270 ° C in the T2 zone. The T3 zone is 230-270 °C, the T4 zone is 230-270 °C, and the nozzle zone is 240-280 °C. The injection pressure setting includes: 60-90% in the P1 zone, 60-90% in the P2 zone, and 60-60 in the P3 zone. 90%, P4 zone is 60-90%, the total pressure is 140kgf/cm ² ; injection speed setting includes: V1 zone is 20-50%, V2 zone is 40-80%, V3 zone is 50-90%, V4 The area is 10 to 40%, and the total speed is 90 to 120 mm/s.

The carbon fibers are chopped carbon fibers, and the chopped carbon fibers have a diameter of 5 to 10 μm.

The number average molecular weight of the above acrylonitrile-styrene copolymer is from 18,000 to 22,000.

The above carbon fiber reinforced composite material further comprises 0.2 to 0.6 parts by weight of the antioxidant and 0.4 to 0.8 parts by weight of the lubricant.

A panel sound beam of a guitar produced by the above preparation method.

A guitar comprising a panel sound beam of the above guitar.

Compared with the prior art, the beneficial effects of the present application include, for example:

The guitar body provided by the present application is an integrally formed component of a backboard, a side panel and a neck of the guitar, which can be bonded with the panel and the sound beam to form a complete guitar. The panel sound beam of the guitar provided by the present application It is an integral part of the guitar panel sound beam. It can be bonded to the back, side and neck of the guitar to form a complete guitar. It can also be directly bonded to the guitar body including the backboard, side panels and neck. A complete guitar; not only can break through the limitations of traditional wooden guitar materials, but also reduce the guitar preparation process, reduce the complexity of manual work, greatly improve the guitar production efficiency, but also ensure the consistency of the guitar quality. At the same time, since the material for preparing the guitar body and the panel sound beam of the present application is a carbon fiber reinforced composite material, it has high specific strength, flexural modulus and impact strength, so that the guitar including the guitar body and the panel sound beam has a higher ratio. Good sound quality, its volume and acoustic performance are higher than wooden guitars, and you can play directly without power.

In addition, the guitar molded by this carbon fiber reinforced composite material has a smooth appearance and can be sprayed; and since the heat distortion temperature of the carbon fiber reinforced composite material is as high as 100 ° C, the humidity of 15 to 85% does not affect its performance, so Ensure that guitars made from this carbon fiber reinforced composite have a wide range of operating temperatures and humidity to extend their life.

Detailed ways

The embodiments of the present application are described in detail below with reference to the embodiments, but those skilled in the art will understand that the following examples are only used to illustrate the present application and should not be construed as limiting the scope of the application. Those who do not specify the specific conditions in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are conventional products that can be obtained by commercially available purchase.

The present embodiment provides a guitar comprising two parts: a guitar body, a panel sound beam of a guitar. Among them, the guitar type includes a backboard, a side panel and a neck of the guitar, which can be bonded to the panel and the sound beam to form a complete guitar. This kind of guitar can solve the complicated problem of the existing wooden guitar making process at the same time; and the problem that the plastic guitar needs to be powered to play.

Further, the guitar sound beams of the guitar body and the guitar are all made by using a carbon fiber composite reinforcing material as a raw material and integrally molded by an injection molding process.

Among them, the carbon fiber reinforced composite material is a thermoplastic material for the preparation of musical instruments discovered by the inventors after several years of research. The carbon fiber reinforced composite material has high specific strength, flexural modulus, and deformation temperature, and ensures that the guitar prepared therefrom has good sound quality, and has excellent drop resistance and dimensional stability.

Although there are many kinds of thermoplastic materials in the prior art, the non-reinforced thermoplastic material has a low flexural modulus, and the guitar neck manufactured by the guitar neck cannot withstand the pulling force of the metal strings; and the guitar panel manufactured by the same The rigidity is poor, the resonance is not strong, the volume is small, and the sound quality is poor.

When the glass fiber reinforced thermoplastic material requires a high content of glass fiber, the flexural modulus of the material can be increased, but at the same time, the density of the injection molded part is large, the specific strength is small, and the injection molded part is added due to the addition of a large amount of glass fiber. The surface is rough and cannot be sprayed further.

In contrast, the carbon fiber has a low density, and the equivalent modulus of the carbon fiber reinforced thermoplastic material is significantly better than that of the glass fiber reinforced thermoplastic material. Therefore, it is suitable to select a carbon fiber reinforced thermoplastic material. However, there are many types of carbon fiber reinforced thermoplastic materials, and the resins are crystalline and amorphous.

Usually, the instrument requires high dimensional stability of the material. If the dimensional stability of the material is not good, it will affect the quality of the instrument, for example, it will affect the tension of the metal string of the guitar, thus affecting the sound quality of the guitar. The carbon fiber-reinforced crystalline resin material is inferior in dimensional stability, and therefore a carbon fiber-reinforced amorphous resin material is preferable.

There are many types of amorphous materials, such as polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), acrylonitrile-styrene copolymer (AS), polystyrene (PS) or polypropylene. (PPE) and so on. General-purpose plastics are easier to injection-molded than engineering plastics, and the molding temperature is also low. Since the integrally formed musical instrument parts are large, general-purpose plastics with good fluidity are preferred. Commonly used carbon fiber reinforced ABS materials have problems such as insufficient flexural modulus, warpage deformation, and floating fibers on the surface, which cannot be sprayed, and do not satisfy the requirements for preparing musical instruments.

Based on the above analysis, the novel carbon fiber reinforced composite material for manufacturing musical instruments used in the present application includes, by weight:

Acrylonitrile-butadiene-styrene copolymer (ABS resin) 20 to 80 parts,

15 to 35 parts of carbon fiber and

Acrylonitrile-styrene copolymer (AS resin) 5 to 30 parts.

Further, the carbon fiber reinforced composite material comprises: 30 to 70 parts of ABS resin, 20 to 30 parts of carbon fiber, and 10 to 25 parts of AS resin, by weight;

Or, by weight, the carbon fiber reinforced composite material comprises: 40 to 60 parts of ABS resin, 23 to 28 parts of carbon fiber, and 15 to 20 parts of AS resin;

Alternatively, the carbon fiber reinforced composite material comprises, by weight, 45 to 55 parts of ABS resin, 24 to 26 parts of carbon fiber, and 17 to 18 parts of AS resin.

Further, the carbon fibers are chopped carbon fibers, and the chopped carbon fibers have a particle diameter of 5 to 10 μm, or 6 to 9 μm, or 7 to 8 μm. The fraction and diameter of the chopped carbon fiber affect the flexural modulus and density of the material, which affects the specific strength of the material.

Further, the number average molecular weight of the acrylonitrile-styrene copolymer is from 18,000 to 22,000.

Further, the carbon fiber reinforced composite material further comprises 0.2 to 0.6 parts by weight of the antioxidant and 0.4 to 0.8 parts of the lubricant; or 0.3 to 0.5 parts of the antioxidant and 0.5 to 0.7 parts of the lubricant; or The antioxidant was 0.4 parts and the lubricant was 0.6 parts.

Wherein the antioxidant comprises at least n-octadecanol of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and at least three of [2.3-di-tert-butylphenyl]phosphite. One. More preferably, the antioxidant comprises, by weight: β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid n-octadecyl alcohol ester 0.1-0.3 parts and three [2.4-two Tert-butylphenyl]phosphite 0.1-0.3 parts.

Wherein the lubricant comprises at least one of zinc stearate and ethylene bisstearamide. More preferably, the lubricant comprises, by weight, 0.2 to 0.4 parts of zinc stearate and 0.2 to 0.4 parts of ethylene bisstearamide.

The preparation method of the carbon fiber reinforced composite material comprises:

Step S1: The acrylonitrile-butadiene-styrene copolymer, the acrylonitrile-styrene copolymer and the auxiliary agent are mixed in parts by weight to obtain a mixed material.

Among them, the additives are antioxidants and lubricants.

More specifically, the premix is mixed, that is, the acrylonitrile-butadiene-styrene copolymer, the acrylonitrile-styrene copolymer and the auxiliary agent are added into the premixer in parts by weight, and mixed for 3 to 5 minutes to obtain A homogeneous mixture.

Step S2: After mixing the mixture with carbon fibers, extrusion granulation is carried out.

Further, the step comprises: kneading and melting the mixture at 200 to 230 ° C, mixing with carbon fibers, kneading and melting at 180 to 220 ° C, extruding and granulating, and cooling at 25 to 45 ° C. .

Further, the carbon fiber reinforced composite material is prepared by an extruder. In order to increase the dispersibility of the components, the screw length to diameter ratio of the extruder is 46 to 50:1, or 47 to 49:1.

Further, the temperature setting of the extruder includes: T1 zone is 80-120 ° C, T2 zone is 180-220 ° C, T3 zone is 180-220 ° C, T4 zone is 180-230 ° C, and T5 zone is 190-230 ° C. , T6 area is 180 ~ 220 ° C, T7 area is 170 ~ 210 ° C, T8 area is 170 ~ 210 ° C, T9 area is 170 ~ 210 ° C, T10 area is 170 ~ 210 ° C, T11 area is 180 ~ 220 ° C, T12 The zone is 180-220 ° C; the temperature in the nose zone is 190-230 ° C.

The carbon fiber reinforced composite material prepared by this method has high specific strength, flexural modulus, and heat distortion temperature, thereby ensuring the sound quality of the instrument prepared therefrom, and can be used for preparing a guitar, a piano backboard, or a cymbal. This material can be integrally molded by injection molding to prepare the major parts of the instrument, thus replacing the traditional restrictions on the preparation of musical instrument parts from wood, greatly improving the manufacturing efficiency of the instrument.

In this embodiment, a guitar is prepared using the carbon fiber reinforced composite material:

The guitar body is made of the above carbon fiber composite reinforcing material as a raw material and integrally molded by an injection molding process.

Further, in order to avoid the shrinkage marks generated on the surface of the injection molded part after injection molding, a gas-assisted injection molding process is adopted, and nitrogen or an inert gas is used as an auxiliary gas, and the gas auxiliary pressure is 200-350 MPa, or 230-320 MPa, or 250. ~ 280 MPa, or 260 ~ 270 MPa. For example, when preparing a guitar type, first injection into a backing plate, and then introducing nitrogen or an inert gas (such as helium gas) into the middle of the injection molded part to eliminate the shrinkage marks on the surface of the backing plate.

Further, the injection molding process comprises: melting the raw material at 160 to 200 ° C, and holding it at 230 to 270 ° C, and then spraying it into a guitar-shaped mold having a temperature of 70 to 120 ° C for injection molding.

Further, the injection pressure in the injection molding process is 60 to 90%, and the total molding time of the guitar body is 240 to 280 s, or 250 to 270 s, or 255 to 265 s.

Further, the guitar type is prepared by an injection molding machine, and the clamping force of the injection molding machine is 800 to 1400 tons, and the injection temperature setting of the injection molding machine includes: 160 to 200 ° C in the T1 zone and 230 to 270 ° C in the T2 zone. The T3 zone is 230-270 ° C, the T4 zone is 230-270 ° C, and the nozzle zone is 240-280 ° C; the injection pressure setting includes: 60-90% of the P1 zone, 60-90% of the P2 zone, and 60-60 of the P3 zone. 90%, P4 zone is 60-90%, the total pressure is 140kgf/cm ² ; injection speed setting includes: V1 zone is 20-50%, V2 zone is 40-80%, V3 zone is 50-90%, V4 The area is 10 to 40%, and the total speed is 120 to 150 mm/s.

The guitar sound beam of the guitar is made by using the above carbon fiber composite reinforcing material as a raw material and integrally molded by an injection molding process.

Further, in order to avoid the shrinkage marks generated on the surface of the injection molded part after injection molding, a gas-assisted injection molding process is adopted, and nitrogen or an inert gas is used as an auxiliary gas, and the gas auxiliary pressure is 200-350 MPa, or 230-320 MPa, or 250. ~ 280 MPa, or 260 ~ 270 MPa. For example, in the preparation of the panel sound beam, the panel is first injection molded, and then nitrogen or an inert gas (such as helium gas) is introduced into the middle of the injection molded part to eliminate the shrinkage marks on the surface of the panel.

Further, the injection molding process comprises: melting the raw material at 160 to 230 ° C, and holding it at 230 to 270 ° C, and then spraying it into a panel sound beam mold of a guitar having a temperature of 70 to 120 ° C for injection molding.

Further, the injection pressure in the injection molding process is 60 to 90%, or 70 to 80%; the total molding time is 100 to 140 s, or 110 to 130 s, or 115 to 125 s.

Further, the panel sound beam is prepared by an injection molding machine, and the clamping force of the injection molding machine is 600-1000 tons, and the injection temperature setting of the injection molding machine includes: 160 to 200 ° C in the T1 zone and 230 to 270 ° C in the T2 zone. The T3 zone is 230-270 ° C, the T4 zone is 230-270 ° C, and the nozzle zone is 240-280 ° C; the injection pressure setting includes: 60-90% of the P1 zone, 60-90% of the P2 zone, and 60-60 of the P3 zone. 90%, P4 zone is 60-90%, the total pressure is 140kgf/cm ² ; injection speed setting includes: V1 zone is 20-50%, V2 zone is 40-80%, V3 zone is 50-90%, V4 The area is 10 to 40%, and the total speed is 90 to 120 mm/s.

The guitar consists of more than five components, such as the panel, the back panel, the head, the side panels, and the metal support bars. In the conventional preparation method, each part is separately produced and then bonded with glue. In this embodiment, the carbon fiber reinforced composite material is used as a raw material to prepare the guitar, and only the two injection molding processes are respectively required to obtain the integrally formed guitar panel sound beam portion and the guitar body portion (including the guitar back plate, the side plate and the neck), and then Glue the two parts together to get the complete guitar. And because the carbon fiber composite reinforcement has a high flexural modulus (19000 MPa), it is not necessary to use a metal support rod to ensure that the guitar does not deform under the tension of the strings, and a metal support rod must be provided on the neck of a conventional acoustic guitar. Prevent deformation.

Therefore, the guitar provided by the present embodiment. In its preparation method, it can not only break through the limitations of traditional wooden guitar materials, but also reduce the guitar preparation process and reduce the complicated manual work, which greatly improves the production efficiency of the guitar and ensures the consistency of the guitar quality. At the same time, compared to the existing electric guitar, this guitar made of carbon fiber reinforced composite material has a unique sound quality, its volume and acoustic performance are higher than that of a wooden guitar, and it can be played without power. In addition, the guitar molded by this carbon fiber reinforced composite material has a smooth appearance and can be sprayed; and since the heat distortion temperature of the carbon fiber reinforced composite material is as high as 100 ° C, the humidity of 15 to 85% does not affect its performance, so Ensuring that guitars made from this carbon fiber reinforced composite have a wide range of operating temperatures and humidity, and have a long service life.

The features and performance of the present application are further described in detail below with reference to the embodiments:

Preparation method of carbon fiber reinforced composite material:

a. The acrylonitrile-butadiene-styrene copolymer, the acrylonitrile-styrene copolymer, and the auxiliary agent in the raw material are mixed in parts by weight to obtain a mixed material; wherein the auxiliary agent includes: β-(3, 5) -di-tert-butyl-4-hydroxyphenyl)propionic acid n-octadecyl alcohol 0.2 parts, tris[2.4-di-tert-butylphenyl]phosphite 0.2 parts, zinc stearate 0.3 parts and ethylene double 0.3 parts of stearamide.

b. The mixture is kneaded and melted at 200 to 230 ° C, mixed with chopped carbon fibers, kneaded and melted at 180 to 220 ° C, extruded and granulated, and cooled at 25 to 45 ° C, that is, Got it.

Example 1

The embodiment provides a guitar type, and the preparation method thereof comprises:

The carbon fiber composite reinforcing material prepared by the above carbon fiber reinforced composite material preparation method is prepared by an injection molding machine, and the clamping force of the injection molding machine is 800 to 1000 tons.

Injection molding process: After the raw material is melted, it is kept in the cylinder for a certain period of time, and then sprayed to a temperature for injection molding in a guitar-shaped mold.

The specific gas-assisted injection molding parameters are as follows:

Injection temperature: 160 to 200 ° C in the T1 zone, 230 to 270 ° C in the T2 zone, 230 to 270 ° C in the T3 zone, 230 to 270 ° C in the T4 zone, and 240 to 280 ° C in the nozzle zone;

Injection pressure: 60 to 90% in the P1 zone, 60 to 90% in the P2 zone, 60 to 90% in the P3 zone, and 60 to 90% in the P4 zone; wherein the total pressure is 140 kgf/cm ² .

Injection speed: 20 to 50% in the V1 zone, 40 to 80% in the V2 zone, 50 to 90% in the V3 zone, and 10 to 40% in the V4 zone; the total speed is 120 to 150 mm/s.

Mold insulation temperature: 70 ~ 90 ° C

Total molding time: 240 ~ 260s

Auxiliary gas: nitrogen;

Gas-assisted pressure: 200 ~ 250Mpa.

Example 2

The embodiment provides a guitar type, and the preparation method thereof comprises:

The carbon fiber composite reinforcing material prepared by the above carbon fiber reinforced composite material preparation method is prepared by an injection molding machine, and the clamping force of the injection molding machine is 1000-1200 tons.

Injection molding process: After the raw material is melted, it is kept in the cylinder for a certain period of time, and then sprayed to a temperature for injection molding in a guitar-shaped mold.

The specific gas-assisted injection molding parameters are as follows:

Injection temperature: 160 to 190 ° C in the T1 zone, 240 to 260 ° C in the T2 zone, 250 to 270 ° C in the T3 zone, 260 to 270 ° C in the T4 zone, and 260 to 280 ° C in the nozzle zone;

Injection pressure: 60 to 90% in the P1 zone, 60 to 90% in the P2 zone, 60 to 90% in the P3 zone, 60 to 90% in the P4 zone, and 140 kgf/cm ^{2 in the} total pressure.

Injection speed: 20 to 50% in the V1 zone, 40 to 80% in the V2 zone, 50 to 90% in the V3 zone, 10 to 40% in the V4 zone, and a total speed of 120 to 150 mm/s;

Mold insulation temperature: 80 ~ 100 ° C;

Total molding time: 255 ~ 265s;

Auxiliary gas: helium gas;

Gas-assisted pressure: 270 ~ 320Mpa.

Example 3

The embodiment provides a guitar type, and the preparation method thereof comprises:

The carbon fiber composite reinforcing material prepared by the above carbon fiber reinforced composite material preparation method is prepared by an injection molding machine, and the clamping force of the injection molding machine is 1200 to 1400 tons.

Injection molding process: After the raw material is melted, it is kept in the cylinder for a certain period of time, and then sprayed to a temperature for injection molding in a guitar-shaped mold.

The specific gas-assisted injection molding parameters are as follows:

Injection temperature: 160 to 180 ° C in the T1 zone, 230 to 250 ° C in the T2 zone, 240 to 260 ° C in the T3 zone, 250 to 280 ° C in the T4 zone, and 260 to 280 ° C in the nozzle zone;

Injection pressure: 60 to 90% in the P1 zone, 60 to 90% in the P2 zone, 60 to 90% in the P3 zone, and 60 to 90% in the P4 zone; the total pressure is 140 kgf/cm ² ;

Injection speed: 20 to 50% in the V1 zone, 40 to 80% in the V2 zone, 50 to 90% in the V3 zone, and 10 to 40% in the V4 zone; the total speed is 120 to 150 mm/s.

Mold insulation temperature: 100 ~ 120 ° C;

Total molding time: 260 ~ 280s;

Auxiliary gas: nitrogen;

Gas-assisted pressure: 310 ~ 350Mpa.

Example 4

This embodiment provides a 38-inch guitar, and the preparation method thereof comprises:

(1) Preparation of the panel sound beam of the guitar: The carbon fiber composite reinforcing material is used as a raw material, and is prepared by an injection molding process.

(2) Guitar preparation: the panel sound beam obtained in the step (1) and the guitar type body provided in the embodiments 1 to 3 are glued; the assembled guitar is polished by a sander and then sprayed; Install a string pillow, string, string and other accessories, that is, get a complete plastic guitar that can be used directly for playing.

Example 5

The embodiment provides a panel sound beam of a guitar, and the preparation method thereof comprises:

The carbon fiber composite reinforcing material prepared by the above carbon fiber reinforced composite material preparation method is prepared by an injection molding machine, and the clamping force of the injection molding machine is 600 to 700 tons.

Injection molding process: After the raw material is melted, it is kept in the cylinder for a certain period of time, and then sprayed into a panel sound beam mold of a temperature for injection molding.

The specific gas-assisted injection molding parameters are as follows:

Injection temperature: 160 to 200 ° C in the T1 zone, 230 to 270 ° C in the T2 zone, 230 to 270 ° C in the T3 zone, 230 to 270 ° C in the T4 zone, and 240 to 280 ° C in the nozzle zone;

Injection pressure: 60 to 90% in the P1 zone, 60 to 90% in the P2 zone, 60 to 90% in the P3 zone, and 60 to 90% in the P4 zone; wherein the total pressure is 140 kgf/cm ² .

Injection speed: 20 to 50% in the V1 zone, 40 to 80% in the V2 zone, 50 to 90% in the V3 zone, and 10 to 40% in the V4 zone; the total speed is 90 to 120 mm/s.

Mold insulation temperature: 70 ~ 90 ° C

The total molding time: 100 ~ 120s.

Auxiliary gas: nitrogen;

Gas-assisted pressure: 200 ~ 250Mpa.

Example 6

The embodiment provides a panel sound beam of a guitar, and the preparation method thereof comprises:

The carbon fiber composite reinforcing material prepared by the above carbon fiber reinforced composite material preparation method is prepared by an injection molding machine, and the clamping force of the injection molding machine is 700 to 900 tons.

Injection molding process: After the raw material is melted, it is kept in the cylinder for a certain period of time, and then sprayed into a panel sound beam mold of a temperature for injection molding.

The specific gas-assisted injection molding parameters are as follows:

Injection temperature: 160 to 190 ° C in the T1 zone, 240 to 260 ° C in the T2 zone, 250 to 270 ° C in the T3 zone, 260 to 270 ° C in the T4 zone, and 260 to 280 ° C in the nozzle zone;

Injection pressure: 60 to 90% in the P1 zone, 60 to 90% in the P2 zone, 60 to 90% in the P3 zone, and 60 to 90% in the P4 zone; wherein the total pressure is 140 kgf/cm ² .

Injection speed: 20 to 50% in the V1 zone, 40 to 80% in the V2 zone, 50 to 90% in the V3 zone, and 10 to 40% in the V4 zone; the total speed is 90 to 120 mm/s.

Mold insulation temperature: 80 ~ 100 ° C;

Total molding time: 120 ~ 130s;

Auxiliary gas: helium gas;

Gas-assisted pressure: 270 ~ 320Mpa.

Example 7

The embodiment provides a panel sound beam of a guitar, and the preparation method thereof comprises:

The carbon fiber composite reinforcing material prepared by the above carbon fiber reinforced composite material preparation method is prepared by an injection molding machine, and the clamping force of the injection molding machine is 800 to 1000 tons.

Injection molding process: After the raw material is melted, it is kept in the cylinder for a certain period of time, and then sprayed into a panel sound beam mold of a temperature for injection molding.

The specific gas-assisted injection molding parameters are as follows:

Injection temperature: 160 to 180 ° C in the T1 zone, 230 to 250 ° C in the T2 zone, 240 to 260 ° C in the T3 zone, 250 to 280 ° C in the T4 zone, and 260 to 280 ° C in the nozzle zone;

Injection pressure: 60 to 90% in the P1 zone, 60 to 90% in the P2 zone, 60 to 90% in the P3 zone, and 60 to 90% in the P4 zone; wherein the total pressure is 140 kgf/cm ² .

Injection speed: 20 to 50% in the V1 zone, 40 to 80% in the V2 zone, 50 to 90% in the V3 zone, and 10 to 40% in the V4 zone; the total speed is 90 to 120 mm/s.

Mold insulation temperature: 100 ~ 120 ° C;

Total molding time: 130~140s;

Auxiliary gas: nitrogen;

Gas-assisted pressure: 310 ~ 350Mpa.

Example 8

This embodiment provides a 38-inch guitar, and the preparation method thereof comprises:

(1) Preparation of guitar type body: It is prepared by injection molding machine process using carbon fiber composite reinforcing material as raw material.

(2) Guitar preparation: the guitar type obtained in the step (1) and the panel sound beam provided in the embodiments 5 to 7 are glued; the assembled guitar is polished by a sander and then sprayed; Install a string pillow, string, string and other accessories, that is, get a complete plastic guitar that can be used directly for playing.

The carbon fiber reinforced composite material and guitar performance provided by the present application were evaluated in conjunction with performance test data.

(1) According to the preparation method of the above carbon fiber reinforced composite material, the carbon fiber reinforced composite material is prepared according to the distribution ratio of the raw material group described in Table 1, and the performance is tested according to the ISO standard, and the influence of the number of carbon fibers on the properties of the composite material is investigated. The results are as shown in Table 1:

Table 1. Effect of the fraction of carbon fiber on the properties of composites

It can be seen from Table 1 that the carbon fiber number mainly affects the flexural modulus and density of the material, thereby affecting the specific strength of the material. The specific strength of the material affects the resonance of the guitar panel and the body, which affects the volume and sound quality of the guitar. The higher the intensity, the greater the volume. At the same time, the flexural modulus affects the tensile strength of the guitar neck. The higher the flexural modulus, the greater the tensile force against the strings, and the less likely the neck is to deform.

The comparison shows that the specific strength of the material in Comparative Example 1 is too low, the resonance effect is very weak, the bass cannot be produced, and the high pitch is not complete. In addition, the flexural modulus of the material in Comparative Example 1 was too low to resist the tensile force of the strings.

(2) According to the preparation method of the above carbon fiber reinforced composite material, the carbon fiber reinforced composite material is prepared according to the distribution ratio of the raw material group described in Table 2, and the performance test is carried out according to the ISO standard, and the influence of the fraction of ABS on the properties of the composite material is investigated. The results are as shown in Table 2:

Table 2. Effect of the number of ABS on the properties of composites

It can be seen from Table 2 that the number of parts of ABS mainly affects the notched impact properties of the material, thereby affecting the impact toughness of the material. The higher the ABS content, the higher the notched impact strength of the material, indicating that the impact resistance of the material is enhanced, but the addition of ABS will reduce the specific strength of the material, so the suitable ABS fraction ranges from 25 to 80 parts.

(3) According to the preparation method of the above carbon fiber reinforced composite material, the carbon fiber reinforced composite material is prepared according to the distribution ratio of the raw material group described in Table 3, and the performance test is carried out according to the ISO standard, and the influence of the number of parts of AS on the properties of the composite material is investigated. The results are as shown in Table 3:

Table 3. Effect of the number of parts of AS on the properties of composites

It can be seen from Table 3 that the number of parts of AS mainly affects the fluidity and glossiness of the material during melt injection molding, and the fluidity is good. When the guitar shape is injected, the parts can easily fill the mold cavity, but the AS is added in a large amount. After that, the impact strength of the material will be reduced. After the material of Comparative Example 2 was melted, the fluidity was poor, and when the guitar type was injection molded, it could not be filled; and the gloss of the injection molded part was poor, and it was impossible to spray paint, and eventually the guitar could not be manufactured. The material of Comparative Example 3, because the notch strength is too low, so that it cannot be tested, the guitar is made, and the guitar is broken when it hits, and the guitar cannot be manufactured. Therefore, the suitable range for AS is 5 to 30 parts.

(4) According to the preparation method of the above carbon fiber reinforced composite material, the carbon fiber reinforced composite material is prepared according to the distribution ratio of the raw material group described in Table 4, and the performance test is carried out according to the ISO standard, and the influence of the molecular weight of the AS on the properties of the composite material is investigated. The results are as described in Table 4:

Table 4. Effect of molecular weight of AS on properties of composites

It can be seen from the comparison of AS of different molecular weights in Table 4 that the molecular weight of AS affects the fluidity and glossiness of the material during melt injection molding, and the fluidity is good. When the guitar type is molded, the parts can be easily filled with the mold cavity. However, the molecular weight of AS is too high to improve the fluidity and gloss of the material. Too low will make the material very brittle, so the suitable molecular weight range is 9000 to 12000.

(5) A 38-inch guitar was prepared using Example 4 and compared with a commercially available 38-inch wooden guitar. The results are shown in Table 5:

Table 5. Guitar performance comparison

Since the volume of the guitar is proportional to the flexural modulus and specific strength of the material, the higher the flexural modulus, the greater the specific strength and the greater the volume of the guitar. As can be seen from Table 5, the guitar provided by the fourth embodiment has a sound sustaining sound superior to a commercially available acoustic guitar at the same size, and has a wider use temperature and humidity.

(6) A 38-inch guitar was prepared using Example 8 and compared with a commercially available 38-inch wooden guitar. The results are shown in Table 6:

Table 6. Guitar performance comparison

Since the volume of the guitar is proportional to the flexural modulus and specific strength of the material, the higher the flexural modulus, the greater the specific strength and the greater the volume of the guitar. As can be seen from Table 6, the guitar provided by the eighth embodiment has a sound sustaining sound superior to a commercially available acoustic guitar at the same size, and has a wider use temperature and humidity.

While the present invention has been illustrated and described with reference to the embodiments of the present invention, it will be understood that many other modifications and changes can be made without departing from the spirit and scope of the application. Accordingly, it is intended to embrace in the appended claims

Industrial applicability

The present application provides a guitar, a guitar body, a panel sound beam and a preparation method thereof, and the guitar body can be combined with a panel and a sound beam to form a complete guitar, which greatly improves the production efficiency of the guitar; The guitar has good sound quality, its volume and acoustic performance are higher than that of a wooden guitar, and it can be played directly without power.

Claims (20)

1. A guitar body preparation method, characterized in that the guitar body comprises a back plate, a side plate and a neck of a guitar, and the guitar body is made of a carbon fiber composite reinforcing material and is integrally formed by an injection molding process. Have

   The carbon fiber-reinforced composite material comprises, by weight, 20 to 80 parts of an acrylonitrile-butadiene-styrene copolymer, 15 to 35 parts of carbon fibers, and 5 to 30 parts of an acrylonitrile-styrene copolymer.
2. The method for preparing a guitar body according to claim 1, wherein in the injection molding process of the guitar body, a gas-assisted injection molding process is employed, and nitrogen or an inert gas is used as an auxiliary gas, and the gas auxiliary pressure is 200. ~350MPa.
3. The method of manufacturing a guitar body according to claim 1, wherein the injection molding process comprises:

   The raw material is melted at 160 to 200 ° C, and then kept at 230 to 270 ° C, and then sprayed into a guitar-shaped mold having a temperature of 70 to 120 ° C for injection molding.
4. The method of preparing a guitar body according to claim 1, wherein the injection molding pressure in the injection molding process is 60 to 90%, and the total molding time is 240 to 280 s.
5. The method for preparing a guitar body according to claim 1, wherein the guitar body is prepared by an injection molding machine, and the clamping force of the injection molding machine is 800 to 1400 tons, and the injection molding machine is The injection temperature setting includes: 160 to 200 ° C in the T1 zone, 230 to 270 ° C in the T2 zone, 230 to 270 ° C in the T3 zone, 230 to 270 ° C in the T4 zone, and 240 to 280 ° C in the nozzle zone; the injection pressure setting includes: P1 area is 60-90%, P2 area is 60-90%, P3 area is 60-90%, P4 area is 60-90%, the total pressure is 140kgf/cm ² ; injection speed setting includes: V1 area is 20 ~50%, V2 area is 40-80%, V3 area is 50-90%, V4 area is 10-40%, and the total speed is 120-150mm/s.
6. The method of producing a guitar type according to claim 1, wherein the carbon fibers are chopped carbon fibers, and the chopped carbon fibers have a particle diameter of 5 to 10 μm.
7. The method of producing a guitar type according to claim 1, wherein the acrylonitrile-styrene copolymer has a number average molecular weight of from 18,000 to 22,000.
8. The method of producing a guitar type according to claim 1, wherein the carbon fiber-reinforced composite material further comprises 0.2 to 0.6 parts by weight of the antioxidant and 0.4 to 0.8 parts by weight of the lubricant.
9. A guitar type body produced by the production method according to any one of claims 1 to 8.
10. A guitar comprising the guitar body of claim 9.
11. A method for preparing a panel sound beam of a guitar, characterized in that the panel and the sound beam of the guitar are made of carbon fiber composite reinforcing material as a raw material and integrally formed by an injection molding process;

    The carbon fiber-reinforced composite material comprises, by weight, 20 to 80 parts of an acrylonitrile-butadiene-styrene copolymer, 15 to 35 parts of carbon fibers, and 5 to 30 parts of an acrylonitrile-styrene copolymer.
12. The method for preparing a panel sound beam of a guitar according to claim 11, wherein in the injection molding process of the panel sound beam, a gas-assisted injection molding process is adopted, and nitrogen or an inert gas is used as an auxiliary gas, and the gas auxiliary pressure is used. It is 200 to 350 MPa.
13. The method of manufacturing a panel sound beam of a guitar according to claim 11, wherein the injection molding process comprises:

    The raw material is melted at 160 to 230 ° C, and then kept at 230 to 270 ° C, and then sprayed into a panel sound beam mold having a temperature of 70 to 120 ° C for injection molding.
14. The method for preparing a panel sound beam of a guitar according to claim 11, wherein the injection molding pressure in the injection molding process is 60 to 90%, and the total molding time is 100 to 140 s.
15. The method for preparing a panel sound beam of a guitar according to claim 11, wherein the panel sound beam is prepared by an injection molding machine, and the clamping force of the injection molding machine is 600 to 1000 tons, and the injection molding The injection temperature setting of the machine includes: 160 to 200 ° C in the T1 zone, 230 to 270 ° C in the T2 zone, 230 to 270 ° C in the T3 zone, 230 to 270 ° C in the T4 zone, and 240 to 280 ° C in the nozzle zone; injection pressure setting Including: P1 zone is 60-90%, P2 zone is 60-90%, P3 zone is 60-90%, P4 zone is 60-90%, the total pressure is 140kgf/cm ² ; injection speed setting includes: V1 zone It is 20-50%, the V2 zone is 40-80%, the V3 zone is 50-90%, and the V4 zone is 10-40%, of which the total speed is 90-120 mm/s.
16. The method of producing a panel acoustic beam of a guitar according to claim 11, wherein the carbon fibers are chopped carbon fibers, and the chopped carbon fibers have a diameter of 5 to 10 μm.
17. The method of producing a panel sound beam for a guitar according to claim 11, wherein the acrylonitrile-styrene copolymer has a number average molecular weight of from 18,000 to 22,000.
18. The method for producing a panel sound beam of a guitar according to claim 11, wherein the carbon fiber reinforced composite material further comprises 0.2 to 0.6 parts by weight of the antioxidant and 0.4 to 0.8 parts by weight of the lubricant.
19. A panel sound beam of a guitar produced by the production method according to any one of claims 11 to 18.
20. A guitar comprising the panel sound beam of the guitar of claim 19.