KR102679413B1 - Speaker diaphragm using basalt fiber and manufacturing method - Google Patents

Abstract

The present invention relates to an eco-friendly speaker diaphragm. The speaker diaphragm is manufactured using basalt fiber woven with yarn extracted from basalt, so it is eco-friendly and has excellent tensile strength, high elastic modulus, alkali resistance, heat resistance, etc. It relates to a speaker diaphragm using basalt fiber that enables speaker performance and a method of manufacturing the same.
Accordingly, the present invention includes the steps of obtaining a basalt fiber fabric; obtaining a paper body; It includes the step of bonding the basalt fiber fabric and the paper body to each other.

Description

Speaker diaphragm using basalt fiber and manufacturing method}

The present invention relates to an eco-friendly speaker diaphragm. The speaker diaphragm is manufactured using basalt fiber woven with yarn extracted from basalt, so it is eco-friendly and has excellent tensile strength, high elastic modulus, alkali resistance, heat resistance, etc. It relates to a speaker diaphragm using basalt fiber that enables speaker performance and a method of manufacturing the same.

In general, the diaphragm of a widely known speaker is made of pulp or PP synthetic resin as the main material, mixed with basic materials, then heated and pressed in a mold to form the diaphragm of the speaker.

Since the main material of such a conventional speaker diaphragm is composed of pulp or PP synthetic resin, in order to improve strength, waterproofing and characteristics, a pressurization process using high heat in the mold and the use of dye strength enhancer, fixative, and waterproofing agent lactic acid are used. Since it was inevitable that it would contain many chemicals, it was necessary to develop speaker materials that were environmentally friendly and could maintain high efficiency even at low and high temperatures.

In addition, when the conventional speaker diaphragm is operated for a long period of time, fatigue accumulates and the sound output is inconsistent or deteriorated, and when exposed to high or low temperatures, the sound quality of the speaker deteriorates.

In addition, the conventional speaker diaphragm must be thin and have good strength and elasticity, but due to the nature of being made of pulp or P.P. synthetic resin, it is crumbly and has low thermal strength. By converting electrical signals into physical signals, the speaker vibrates a lot. The situation was that the diaphragm itself was insufficient in its central role for the desired characteristics.

Meanwhile, as a material for special fibers, fibrous basalt is an innovative fiber material that is being commercialized mainly in the field of high-performance fibers dominated by existing special glass fibers and carbon fibers. Basalt fibers are non-toxic and do not cause pulmonary fibrosis or carcinogenesis. Since it has no action, it emits far infrared rays and negative ions more than other rock materials, and emits very little radiation, so it is used as antibacterial therapy materials, building interior materials such as apartment wallpaper and wall moldings, clothing and bedding materials, and various leisure sports equipment materials. there is.

In addition, basalt is non-flammable, heat-proof, heat-resistant, sound-proof, dust-proof, acid- and alkali-resistant, corrosion-resistant, abrasion-resistant, and lightweight and high-strength, making it suitable for use in industries such as military, bulletproof, aviation materials, ships, automobiles, and mechanical equipment. It is widely used in the field.

Here, fibers extracted from basalt can be used for speaker diaphragms, etc. The weaving types of basalt fibers used in speaker diaphragms include plain weave, twill weave, and woven weave, and for heat compression molding of the diaphragm, they are used as warp and seam threads on the surface of the fabric for heat compression molding of the diaphragm. A twill weave that forms a ridged pattern in the direction of light is mainly used, and a main weave that allows many warp or weft threads to appear on the surface of the fabric depending on the shape of the diaphragm is used.

Republic of Korea Patent Publication No. 10-1620321 is presented.

The present invention is intended to solve the conventional problems, and improves the shortcomings of the conventional speaker diaphragm by manufacturing a speaker diaphragm with basalt fiber using eco-friendly basalt ore to provide a highly efficient speaker diaphragm, and provides high output and high temperature of speaker sound. Provides a speaker diaphragm using basalt fiber and its manufacturing method that does not cause deformation or bending due to heat even in a humid environment or under any adverse conditions, and prevents deformation even under adverse conditions in various environments such as heat, moisture, pressure, friction, vibration, and solar rays. There is a purpose to doing so.

To solve this purpose, the present invention;

(S1) obtaining a basalt fiber fabric;

(S2) obtaining a paper body;

(S3) bonding the basalt fiber fabric that has completed step S1 and the paper body that has completed step S2 to each other. It provides a method of manufacturing a speaker diaphragm using basalt fiber, comprising:

Additionally, the present invention;

A speaker diaphragm using basalt fiber manufactured by the above-described manufacturing method is provided.

According to the present invention, the speaker diaphragm is made of basalt fiber, so it is environmentally friendly, has excellent tensile strength, high modulus of elasticity, and has excellent alkali resistance and heat resistance, making it possible to achieve excellent acoustic performance of the speaker, and can be used in high temperature and high humidity environments. However, there is no deformation or bending due to heat under any adverse conditions, and there is no deformation even under adverse conditions in various environments such as heat, moisture, pressure, friction, vibration, and solar rays.

1 is a process flow chart of a method for manufacturing a speaker diaphragm using basalt fibers according to an embodiment of the present invention.
Figure 2 is an illustration of compression molding in the manufacturing method of Figure 1.
Figure 3 is a configuration diagram of a speaker diaphragm using basalt fiber according to an embodiment of the present invention.
Figures 4 and 5 are graphs comparing the speaker characteristics of a speaker diaphragm using basalt fiber according to the present invention and a conventional diaphragm.

The characteristics of the speaker diaphragm using basalt fiber according to the present invention and its manufacturing method can be understood through the embodiments described in detail below with reference to the attached drawings.

Meanwhile, embodiments of the present invention may be implemented in various embodiments within the scope of the technical field to which the invention pertains, and are not particularly limited to the embodiments described herein.

In addition, in order to clearly explain the present invention, repetitive descriptions of the same or similar components are omitted throughout the specification, parts that are not related to the description in relation to the drawings are not shown in the drawings, and the general configuration is omitted. When describing elements, the drawing symbols for them are omitted.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a process flow chart for a method of manufacturing a speaker diaphragm using basalt fiber, Figure 2 is an example of compression molding, and Figure 3 is a configuration diagram of a speaker diaphragm using basalt fiber.

Accordingly, the method of manufacturing a speaker diaphragm using basalt fiber includes the steps of (S1) obtaining a basalt fiber fabric; (S2) Obtaining a paper body; (S3) bonding the basalt fiber fabric that completed step S1 and the paper body that completed step S2 to each other.

Below, each of the above-described configurations will be described in detail.

First, step (S1) is a process for processing and preparing basalt fiber fabric 11 extracted from basalt and woven so that it can be applied to the speaker diaphragm 1.

Here, step S1 includes (S1-1) obtaining basalt fiber fabric extracted from basalt and woven; (S1-2) Impregnating the basalt fiber fabric with an impregnating liquid; (S1-3) Compressing the basalt fiber fabric that completed step S1-2 using upper and lower rollers; (S1-4) drying the basalt fiber fabric that completed step S1-3 in a hot air blower at a specific temperature and for a specific time; (S1-5) It further includes the step of cutting the basalt fiber fabric that has completed step S1-4.

According to Figure 1, when the basalt fiber fabric extracted from basalt and woven in step S1-1 is provided, a process of impregnating the basalt fiber fabric provided in step S1-2 using an impregnation liquid is performed.

The impregnation solution can be used by mixing phenol (65%), thermosetting bond (5%), and diluent (30%) and stirring.

At this time, due to the nature of the basalt fibers, the impregnating liquid is not evenly adsorbed, so after impregnating with the impregnating liquid in step S1-2, a pressing process using upper and lower rollers is necessary to ensure that the liquid is evenly adsorbed by rotating the rollers in step S1-3.

In the compression process of step S1-3, the gap is aligned by adjusting the height of the upper and lower rollers, and the aligned gap between the upper and lower rollers must match the thickness of the basalt fiber.

The upper and lower rollers are made of elastic material, and rollers made of rubber are preferably used.

In the drying process of step S1-4, the basalt fibers compressed through step S1-3 are dried in a hot air gun at a temperature of approximately 74°C for approximately 25 to 30 minutes, or in a hot air blower at a temperature of approximately 80 to 85°C for approximately 15 minutes. Drying can be performed, and the temperature and drying time of the hot air blower can be adjusted depending on the condition of the basalt fibers, and are not particularly limited to the temperature and drying time of the hot air blower.

The cutting process in step S1-5 is performed in rows of the same weave shape according to the molded size of the vibration plate, and must be ensured to prevent deformation of the weave shape or unraveling of the yarn.

And step S2 is a process for processing and preparing the paper body 12, which is attached to the basalt fiber fabric 11 and made into the vibration plate 1.

Here, step S2 includes (S2-1) heat press molding paper made by mixing waterproofing liquid and papermaking raw materials to obtain a paper body; (S2-2) It further includes the step of applying a water-repellent liquid to the back of the paper body that has completed step S2-1 for water-repellent treatment.

According to Figure 1, step S2-1 is a process for manufacturing the paper body 12 by heat press molding the papermaking raw material mixed with the waterproofing liquid, and the paper body 12 is the back side of the basalt fiber fabric manufactured through step S1. It has a size and shape that can be joined to.

When forming the paper body (12), the waterproofing agent is added to the raw material tank (filled with pulp particles and water-diluted papermaking raw materials) and mixed with the papermaking raw materials in the raw material tank. The waterproofing agent is mixed with 200cc of water in 1000cc of water for approximately 400L. The waterproofing agent is in the form of a diluted solution.

At this time, the waterproofing liquid mixed with the papermaking raw material is molded along with the drying of the waterproofing liquid in heat press compression molding for the paper body 12.

Step S2-2 requires water repellent treatment on the back of the body after paper molding of the paper body 12. The water repellent solution for water repellent treatment on the back of the paper body 12 is applied under high pressure to the back after paper molding of the paper body 12. It is sprayed and dried to form a water-repellent coating, and the water-repellent liquid is composed of a solution of 500 cc of water repellent diluted in approximately 1000 cc of water.

In this case, if the water-repellent liquid is absorbed into the front surface after heat press molding the paper body (12), the basalt fiber fabric (11) and the paper body (12) are not bonded smoothly, so it is applied to the back of the paper body (12). The water repellent is applied using an automatic spray method.

The water repellent liquid is compressed and molded simultaneously with drying during the heat press bonding of the basalt fiber fabric 11 and the paper body 12 in the subsequent process.

And step S3 is a process for finally manufacturing the diaphragm body 10 obtained by bonding the basalt fiber fabric 11 and the paper body 12 manufactured through the above-described process steps to the speaker diaphragm 1.

Here, step S3 (S3-1) is prepared by laminating the paper body 12 and the basalt fiber fabric 11 between the lower mold 110 and the upper mold 120, and compressing it with a heat press at a specific temperature and for a specific time. forming a vibrating plate body (10) by combining the basalt fiber fabric (11) and the paper body (12); (S3-2) Obtaining the body edge 13; (S3-3) attaching the body edge of step S3-2 to the diaphragm body 10 of step S3-1 by heat compression.

According to Figure 1, step S3-1 involves stacking the basalt fiber fabric 11 manufactured through step S1 and the paper body 12 manufactured through step S2 between the lower mold 110 and the upper mold 120. They are compressed and molded using a heat press to join them, forming the diaphragm body 10.

Meanwhile, as shown in FIG. 2, the lower mold 110 and the upper mold 120 for heat press compression molding are provided with a paper body 12 and a basalt fiber fabric ( 11) are stacked to perform compression molding. The temperature during compression molding should be approximately 230±10°C for the upper mold 120 and approximately 210±5°C for the lower mold 110, and the molding time should be approximately 10°C. It is carried out in ± seconds.

In this case, when the temperature of the upper mold 120 is 230 ± 10 ℃ and the temperature of the lower mold is 210 ± 5 ℃ or lower, the basalt fiber fabric 11 and the paper body 12 are not bonded smoothly when bonding, If the temperature of the upper mold 120 is 230 ± 10°C and the temperature of the lower mold is 210 ± 5°C or higher, the added chemical may break due to hardening and volatilization.

In addition, in step S3-1, in order to prevent the impregnation liquid from the impregnation treatment from sticking to the surface of the mold during compression molding, the upper mold 120 is treated with corrosion (chemical treatment) and the surface is roughened to allow the impregnation liquid, which is a curing solution, to be applied to the upper mold 120. Sticking to the mold during molding can be minimized.

At this time, when joining the paper body 12 and the basalt fiber fabric 11, the shape is not formed due to hardening of the basalt fiber fabric 11, so the basalt fiber fabric 11 is placed on the paper body 12 using hot air from a hot air gun and the basalt fiber fabric 11 is then placed on the paper body 12. It is desirable to perform the heat press process while maintaining the shape of (11).

In addition, in step S3-1, even in the corrosion treatment of the upper mold 120 described above, the impregnating liquid causes damage to the molded object when it sticks to the mold surface, that is, within the upper mold 120, and is difficult to separate after compression molding. In order to solve this problem, the upper mold 120 is provided with an air injection nozzle and an air injection hole that spray compressed air at high pressure after compression molding, and the compressed air is supplied to the molding object through the air injection nozzle and the air injection hole. At the same time as spraying it to separate it from the upper mold 120, the vacuum suction action of the vacuum mechanism acting through the vacuum suction hole formed on the lower mold 110 acts on the molding object separated from the upper mold 120. The molding object stuck in the upper mold 120 can be easily separated.

In this case, the separation structure of the molded object by the air injection method is such that when the release agent is applied, an oil film is formed, making it difficult to adhere parts such as dust caps when assembling the speaker, and adhesion to the edges in the subsequent process is not easy, so high-pressure air injection is required. The method was applied.

Step S3-2 is a process for manufacturing the rubber body edge 13 and consists of an edge forming step, an edge primer application step, a natural drying step, an edge bond application step, and a drying step.

Briefly explaining the body edge 13 manufacturing process, the EPDM rubber raw material is kneaded and then placed in a mold and heat-compressed. After molding the EPDM edge, the adhesive strength is significantly reduced due to oil on the surface, so a fryer is applied to remove the oil. is removed, a thermosetting adhesive bond is applied, dried, and heat compression molded to manufacture the body edge 13.

In step S3-3, adhesive is applied between the diaphragm body 10 manufactured through the process of step S3-1 and the body edge 13 manufactured through the process of step S3-2, and then heat compression molded with a heat press to form a bond between them. By attaching it, the diaphragm (1) is completed.

In this case, the joined diaphragm body 10 and body edge 13 must be reinforced on the front and rear surfaces. After attaching the reinforcing bond to the diaphragm body 10 and body edge 13, in order to reinforce the adhesive strength, the diaphragm body 10 ) and the body edge (13) are reinforced by applying reinforcing bond to the area where the adhesion ends.

Meanwhile, the diaphragm manufactured through the above-described process is finally completed through a drying step and an inspection step before being shipped.

Hereinafter, a speaker diaphragm using basalt fiber according to the present invention will be described with reference to FIG. 3.

According to Figure 3, the speaker diaphragm 1 using basalt fiber manufactured by the above-described manufacturing method is attached to the basalt fiber fabric 11 made of basalt fiber material and the rear of the basalt fiber fabric 11 to provide a support function. It consists of a paper body (12) that does the following.

Here, the reason for combining the paper body 12 with the basalt fiber fabric 11 is that a gap is created between the yarns depending on the weaving type of the basalt fibers, and to solve this, due to the characteristics of the speaker, when resin or acrylic coating is applied, the inherent properties of the basalt fibers are removed. As the characteristics disappear and the weight and thickness of the diaphragm increase, a decrease in sound pressure occurs when assembling the speaker, causing a decrease in sound quality, so a paper body (12) was applied as a back plate to support the basalt fiber fabric (11).

In this case, when the paper body 12 is applied to the back of the basalt fiber fabric 11, the paper body 12 is waterproof and water-repellent as thin as possible, and a sturdy, light and solid diaphragm is obtained.

Hereinafter, an example of comparing the speaker characteristics of a speaker diaphragm using basalt fiber according to the present invention and a conventional diaphragm will be described with reference to FIGS. 4 and 5.

For a comparative example, a basalt fiber diaphragm (referred to as basalt diaphragm) and a conventional P.P synthetic resin diaphragm were each applied to a 6.5 inch speaker and the speaker characteristics were compared. The red graph shows a basalt diaphragm, and the black graph shows a diaphragm made of existing P.P synthetic resin.

According to Figure 4, as an IMP characteristic graph, it can be seen that when a signal is input to the speaker and the frequency is lowered, the vibration of the diaphragm increases at a certain frequency. This is the resonance point of the speaker's vibration system and is called the lowest resonance frequency of the speaker.

In the graph, the lowest resonant frequency corresponds to the apex of the peak, and since the lowest resonant frequency is the limit frequency of the low sound that the speaker can reproduce, the lower the lowest resonant frequency, the more advantageous it is for low sound reproduction.

According to Figure 5, the SPL graph refers to the sound pressure level that can be obtained at a position 1M in front of the speaker when a 1W signal is input. Generally, speakers with good performance have a large sound pressure level value.

In this case, when comparing the performance of the P.P synthetic resin diaphragm and the basalt diaphragm, it can be seen that the sound pressure level of the basalt diaphragm is higher.

This is because the weight and rigidity are strengthened through the basalt diaphragm manufacturing method, resulting in a low energy loss rate when converted to kinetic energy. The basalt diaphragm has rich bass and stable playback performance compared to P.P synthetic resin materials, as well as the eco-friendly characteristics of basalt fiber and high temperature and humidity. There is no deformation or bending due to heat in the environment or any adverse conditions, and it has the characteristic of not deforming even in adverse conditions in various environments such as heat, moisture, pressure, friction, vibration, and solar rays, improving the durability of speakers using basalt diaphragms. .

As described above, the present invention has expressed preferred embodiments through the above description and drawings, but there is no particular limitation on the terms used to describe the present invention, and the present invention is within the scope of the technical idea of the invention. The embodiments can be changed or modified in various ways at the level of those skilled in the art in the technical field to which the present invention belongs, and are not limited to the embodiments of the detailed description and claims of the present invention.

One; diaphragm 11; Basalt Fiber Fabric
12; paper body 13; body edge
10; diaphragm body

Claims (5)

(S1) obtaining a basalt fiber fabric;
(S2) obtaining a paper body;
(S3) bonding the basalt fiber fabric that completed step S1 and the paper body that completed step S2 to each other,
In step S3,
(S3-1) Prepare the paper body 12 and the basalt fiber fabric 11 by laminating them between the lower mold 110 and the upper mold 120, and compression mold them with a heat press at a specific temperature and for a specific time to form the basalt fiber fabric. Combining (11) and the paper body (12) and forming them into a diaphragm body (10);
(S3-2) Obtaining the body edge 13;
(S3-3) attaching the body edge of step S3-2 to the diaphragm body 10 of step S3-1 by heat compression,
In step S3-1, the upper mold 120 is provided with an air injection nozzle and an air injection hole for spraying compressed air at high pressure after compression molding, and the compressed air is supplied to the molding object through the air injection nozzle and the air injection hole. The basalt fibers are sprayed to separate from the upper mold 120, and the lower mold 110 is separated from the upper mold 120 by the vacuum suction action of a vacuum mechanism acting through a vacuum suction hole. Method of manufacturing a speaker diaphragm using a speaker diaphragm. According to paragraph 1,
The S1 step is,
(S1-1) Obtaining basalt fiber fabric extracted from basalt and woven;
(S1-2) Impregnating the basalt fiber fabric with an impregnation solution;
(S1-3) Compressing the basalt fiber fabric that completed step S1-2 using upper and lower rollers;
(S1-4) drying the basalt fiber fabric after completing step S1-3 in a heater at a specific temperature and for a specific time;
(S1-5) cutting the basalt fiber fabric that has completed step S1-4. A method of manufacturing a speaker diaphragm using basalt fiber, further comprising: According to paragraph 1,
In step S2,
(S2-1) Obtaining a paper body by heat press forming paper made by mixing waterproofing liquid and papermaking raw materials;
(S2-2) A method of manufacturing a speaker diaphragm using basalt fiber, further comprising the step of applying a water-repellent liquid to the back of the paper body after completing step S2-1 to treat it as water-repellent. delete A speaker diaphragm using basalt fibers manufactured according to any one of claims 1 to 3.

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