KR101118687B1 - Process for producing sandwich type composite panel - Google Patents

Abstract

The present invention is a sandwich type composite plate, characterized in that for manufacturing a composite plate using a combination of the Hand Lay-up method, Infusion method and vacuum molding method using a carbon fabric or glass fiber fabric and synthetic resin The manufacturing method of the invention, the surface layer of the composite plate is beautiful, the surface layer of the composite plate is beautiful, the molded laminated members maintain a uniform thickness and a uniform synthetic resin impregnation amount of high mechanical strength and curved surface It is an advantage that the composite plate can be manufactured, and it is used as a bumper for automobiles due to high elasticity and mechanical strength, or because there is no bubble inside the composite plate, X-ray imaging or computed tomography (CT) It is used as a medical stand (table or cradle) for accurate X-ray or single layer by bubbles generated inside the composite sheet A composite sheet of a structure that can prevent the problem can not read zero result is expected to expand its scope of application. In addition, the sandwich-type composite plate produced by the method of the present invention has a smooth surface, and is beautiful and omits the sanding process and the coating process for coating the outer surface of the composite plate, thereby simplifying the process and reducing the defective rate, resulting in low productivity. High is an advantage.

Sandwich type composite board, Hand Lay-up method, Infusion method, carbon fabric, fiberglass fabric, synthetic resin

Description

Process for producing sandwich type composite panel

The present invention relates to a method for manufacturing a sandwich-type composite plate, and more specifically, using a hand-lay-up method, an infusion method and a vacuum molding method using a carbon fabric or glass fiber fabric and synthetic resin By combining the composite plate, the composite plate surface layer is beautiful, and the molded laminated members maintain a uniform thickness and a uniform impregnation amount of the synthetic resin, so that the mechanical strength is high, and the composite plate having a curved surface can be manufactured. It relates to a method for producing a sandwich composite plate.

The general sandwich-shaped composite plate is largely manufactured by the hand lay-up method and the infusion method.

As shown in FIG. 1, a sandwich-shaped composite plate manufactured by a hand lay-up method is first a face plate manufacturing process of a sandwich composite plate, and a plurality of mold release processes are performed on a mold manufactured to a desired shape. When the release agent application process (S100), the gel coating (el-coating) process of coating using a gel coat agent of the finish color required on the mold-treated mold surface (S200), and the gel coat agent reaches a semi-cured state , Laminating a glass fiber fabric on the gel coating layer, rubbing the resin of room temperature curing type, such as polyester resin evenly using a roller, laminating step (S300) and repeatedly applying the fabric and resin to the required thickness, room temperature or 80 ℃ After each of the upper and lower face plates are produced through a molding process (S400) to cure at a temperature of 100 ° C, the upper and lower face plates are subjected to a sanding process (S500) for smoothing the surface close to the core material. Each production.

In addition, after preparing the core material (P1) of the foam material processed into a specific shape separately and sanding the upper and lower plates and the foamed foam core material in contact with each other produced through the above process process, and then coated using a polyester resin, the top and bottom After joining the face material and core material (S600) and then clamping and fixing, and after the forming process (S700) to cure at room temperature or 80 ℃ or around the end of trimming and removing the bur (bur) part of the joint The manufacturing process (S800) is a method of manufacturing a composite plate material through a sanding process (S900) for sanding the outer surface of the product and a painting process (S1000) for applying an external primer and a paint coat thereof.

Although the hand lay-up method is beautiful in the form of a sandwich-shaped composite sheet, all layers (sheet or ply) are manually coated with a roller to apply synthetic resin, and thus, the composite sheet and the laminated members laminated thereon. Synthetic resin is not uniformly impregnated into the overall thickness of the composite plate, as well as the thickness between each laminated member is not uniform, there is a disadvantage that the mechanical performance is also reduced by excessive resin ratio.

Therefore, when using the sandwich-shaped composite sheet manufactured by the above method to apply to a bumper or a medical support (table or cradle), etc., the thickness between the laminated members is not uniform, so If there is a strong external impact directly on the weak part of the bumper, there is a possibility of large participation or X-ray or computed tomography (CT) using a medical stand (table or cradle). Bubbles generated inside the laminated member constituting the composite plate may cause problems that the accurate X-ray imaging or tomography results cannot be read.

And the sandwich-shaped composite plate produced by the Infusion method is, as shown in Figure 2, the release agent coating step (Q100) and the upper and lower plate face material manufacturing process for releasing a plurality of release treatment to the mold produced in the desired shape A lamination process (Q200) for laminating a material (fabric) of a desired thickness to a mold for molding, a sealing process (Q300) for sealing with a sealant and a bagging film for resin injection, and a resin to be applied. After the resin is injected through the resin injection process (Q400) to adjust the viscosity to inject the resin into the sealed space, and the resin is filled on the entire surface, it is molded through the molding process (Q500) to cure at room temperature or moderately high temperature. The upper and lower face plates are respectively produced through a sanding process (Q600) for smoothing the closing surface.

In addition, after preparing a core material of foam foam material processed into a specific shape and sanding the upper and lower plate and the foam foam core material contacting each produced by the above process process and then the same as the hand lay-up method It is a method to complete the manufacturing process through the joining process (Q700), molding process (Q800), finishing (Q900), sanding process (Q1000) and coating process (Q1100) by the method.

As described above, the infusion method also has a slightly improved mechanical performance compared to the hand lay-up method on the beautiful surface, but when the plate is manufactured, the ratio of the synthetic resin is high, so that the rigidity or mechanical strength of the plate is high. Not only is it difficult to fully satisfy the performance, it is not easy to inject the resin in the three-dimensional curved shape products often cause defects.

Therefore, in the case of a sandwich type composite member having a non-planar curved surface, that is, for example, it is applied to a composite plate having a curved surface such as, for example, a bumper for automobiles or a medical stand (table or cradle) as shown in FIG. In case that the defect rate is high, the thickness of the laminated members is not uniform, and if a strong external shock is applied directly to the weak part of the bumper for a car in case of a car contact accident, a large disaster may occur or a medical stand may be used. Or as a cradle, the X-ray or CT (Computed Tomography) can not properly read the photographing result due to bubbles generated inside the composite sheet, or the thickness of the laminated member constituting the composite sheet In thick areas, X-rays or tomography do not penetrate the composite plate properly, The reflected X-rays (X-ray) There were concerns harm to the human body.

Therefore, the present invention for improving the above problems is a sandwich composite plate using a combination of a hand-lay-up method, an infusion method and a vacuum molding method using a carbon fabric or glass fiber fabric and synthetic resin By manufacturing a, the surface layer of the composite plate is beautiful, the molded laminated members to maintain a uniform thickness and uniform synthetic resin impregnation amount of mechanical strength is high, the foam is not formed inside the composite plate material bumper for cars, An object of the present invention is to provide a method for manufacturing a sandwich composite plate, characterized in that the production of a sandwich composite plate having a curved surface, such as a medical support (table or cradle).

As described above, the sandwich composite plate produced by the method of the present invention has a smooth surface, and is thus beautiful, which simplifies the process by omitting a sanding process, a painting process, etc. for painting the surface of the sandwich composite plate, Another object of the present invention is to provide a method for producing a sandwich type composite plate, which is characterized by low productivity and high productivity.

The present invention for solving the above problems in the manufacturing method of the sandwich type composite plate,

After applying a release agent several times to a mold made into a desired shape, and then laminating the fabric 1 ply (ply), wrapped the laminated fabric with a bagging film on the outside and then sealed with a sealant and then synthetic resin Fabric layer manufacturing process (R100) for producing a fabric layer by injecting;

A prepreg plate manufacturing process (R200) by vacuum molding using a prepreg in a separate mold;

After the synthetic resin is applied to the fabric layer and laminated on the prepreg plate on the upper surface plate production process (R300) for manufacturing the upper plate and the lower plate of the sandwich-type face plate by vacuum molding, respectively;

A sandwich type composite plate manufacturing process (R400) for inserting and molding a foamed foam core between the upper faceplate and the lower faceplate;

Finishing process (R500) for removing the bur (bur) of the molded sandwich composite plate;

The manufacturing method of the sandwich type composite board material characterized by manufactured through this is made into a problem solving means.

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In the fabric layer manufacturing process (R100), the fabric is preferably a carbon fiber fabric or glass fiber fabric,

In addition, the synthetic resin is preferably used to select one of the polyester resin or vinyl ester resin,

In the prepreg plate manufacturing process (R200), the prepreg is preferably uni-directional carbon / epoxy prepreg or carbon fabric / epoxy prepreg,

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The vacuum molding is carried out by wrapping the laminated fabric with a bagging film outside the prepreg plate and then sealing it using a sealant.

In the sandwich composite plate manufacturing process (R400), the foamed foam core is preferably selected from PMI (Polymethacrylimide) foam, urethane foam or PVC foam.

Therefore, the sandwich-type composite plate produced according to the present invention by the above-mentioned problem solving means is beautiful surface layer of the composite plate material, beautiful surface layer of the composite plate material, beautiful surface layer of the composite plate material, the molded laminated members are uniform It is an advantage that it is possible to manufacture sandwich type composite board with high mechanical strength and curved surface by maintaining impregnated amount of synthetic resin with uniform thickness. It is used for automobile bumper or composite plate material by high elastic force and mechanical strength. Since there is no bubble inside, it is possible to prevent the problem of not reading the accurate X-ray or tomography result due to bubbles generated inside the composite plate when used as a medical stand (table or cradle) for X-ray or tomography. It is expected that the application range will be expanded as a composite plate of a structure that can be. In addition, the sandwich-type composite plate produced by the method of the present invention has a smooth surface, and is beautiful and omits the sanding process and the coating process for coating the outer surface of the composite plate, thereby simplifying the process and reducing the defective rate, resulting in low productivity. High is an advantage.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 3 to 9, and like reference numerals denote like elements for performing the same functions in FIGS. 3 to 9. On the other hand, in the drawings and detailed description showing and referring to the configuration and operation that can be easily understood by those skilled in the art of manufacturing a general sandwich composite plate is briefly or omitted. .

In the present invention, Figure 3 is a sandwich-type composite member having a curved surface prepared in accordance with the present invention, a photograph showing a patient's medical pedestal (table or cradle) for X-ray imaging or tomography, Fig. 4 is an embodiment according to the present invention, and relates to a flowchart showing a process of manufacturing a sandwich-type composite plate by combining the Hand Lay-up (Inlay) method and the Infusion (Infusion) method.

The present invention uses a carbon fabric or a glass fiber fabric and a synthetic resin to produce a composite plate by combining a hand lay-up method, an infusion method, and a vacuum molding method, thereby forming a uniform laminated member The mechanical strength is high by maintaining the thickness and impregnation amount of the synthetic resin, and the curved surface such as a patient medical cradle for X-ray imaging or tomography composed of a sandwich composite member as shown in FIG. It is characterized in that the composite plate having a structure can be manufactured.

As an embodiment according to the present invention, a method of manufacturing a sandwich composite plate will be described in detail with reference to FIGS. 3 and 4, which are attached drawings.

The present invention is a method of manufacturing a sandwich composite plate,

After applying a release agent several times to a mold made into a desired shape, and then laminating the fabric 1 ply (ply), wrapped the laminated fabric with a bagging film on the outside and then sealed with a sealant and then synthetic resin Fabric layer manufacturing process (R100) for producing a fabric layer by injecting;

A prepreg plate manufacturing process (R200) by vacuum molding using a prepreg in a separate mold;

After the synthetic resin is applied to the fabric layer and laminated on the prepreg plate on the upper surface plate production process (R300) for manufacturing the upper plate and the lower plate of the sandwich-type face plate by vacuum molding, respectively;

A sandwich type composite plate manufacturing process (R400) for inserting and molding a foamed foam core between the upper faceplate and the lower faceplate;

Finishing process (R500) for removing the bur (bur) of the molded sandwich composite plate;

Sandwich type composite plate is characterized in that it is manufactured through.

And with reference to Figures 5 to 9 attached to the manufacturing method of the sandwich-type composite plate according to the present invention in detail for each process, as follows.

In addition, it should be noted that the conditions of each process in the present invention are different depending on the type of compound of the material used in each process and the characteristics thereof, so that they may be appropriately changed according to design conditions, not necessarily defined process conditions.

5 to 9 in the present invention relates to a photograph taken by the process of manufacturing a sandwich-type composite plate (for example: medical pedestal) according to the present invention, Figure 5 is a ready state for applying to the mold with a release agent 6A to 6C are photographs showing a process of sealing the first ply into a mold and sealing it with a bagging film for molding in an infusion method. The prepreg is laminated on one ply subjected to the infusion method to produce a prepreg plate by high temperature vacuum molding, and FIGS. 8A and 8B show a mold (lower mold) in which a vinyl is prepreg plate. After peeling off, it is a photograph of the state before laminating the foam foam core between the upper and lower face materials, Figure 9 is a photograph of the process of molding by clamping the upper and lower molds and then hardening the mold .

In the present invention, only the upper mold 10, the lower mold 20 and the foam foam 30, together with the reference to the embodiment shown by the picture in the accompanying drawings as described above, and other configurations will be supplemented by the detailed description It should be noted that explanation is made so that

Sandwich type composite plate prepared according to the present invention, first, a release agent application step (R101) for applying a release agent several times to a mold produced in a desired shape in the fabric layer manufacturing process (R100), and the fabric to the mold release agent is applied 1 ply lamination process (R102), and the sealing process (R103) for wrapping the laminated fabric with a bagging film (synthetic resin injection) and then sealing using a sealant (R103) to apply and The fabric layer is manufactured through a synthetic resin injection process (R104) which applies vacuum at -722 to -798 mmHg vacuum pressure to adjust the viscosity of the synthetic resin to inject the synthetic resin into the sealed space. .

The release agent used in the release agent application process (R101) is a compound for use so that a molded product can be easily demolded from a mold during a demolding operation, and as a release agent compound commonly used in the art, a precoat 700NC (clear) Trade), and the kind of such release agent is not a feature of the present invention.

In the releasing agent coating process (R101), the number of application of the releasing agent is applied several times, preferably 2 to 5 times, and the number of coatings may be appropriately adjusted according to the type of material to be molded and the type of the releasing agent compound.

For reference, in the present invention, Figures 5a and 5b relates to a photograph taken the preparation state for applying to the mold with a release agent, as shown in Figure 5a has the same upper mold 10 and the shape shown in Figure 5b As described above, the present invention relates to a photograph of the lower mold 20 having a shape corresponding to the shape of the upper mold 10.

In addition, the fabric used in the lamination process (R102) is preferably used by selecting one or more of carbon fiber fabric or glass fiber fabric which is a fabric having high mechanical properties.

In addition, the sealing process (R103) is applied a mold release agent several times to a mold made in a desired shape and then laminated a ply of the fabric (ply) and the laminated fabric with a bagging film (outer) on the outside After wrapping, seal it with sealant and inject synthetic resin to make fabric layer.

The synthetic resin used in the lamination step (R102) is preferably one selected from polyester resins and vinyl ester resins.

In addition, the synthetic resin injection process (R104) is a process of injecting a synthetic resin into a bagging film, unlike a prepreg impregnated with a specific amount of synthetic resin on the fabric, supplying a sufficient amount of synthetic resin to the surface layer to make the surface layer beautiful. Therefore, in this process, the hand lay-up method has a beautiful surface, but it is uneven in thickness because it is applied by hand using a roller to impregnate the resin in every layer (sheet or ply). This is a method to compensate for the disadvantage that the mechanical performance is also reduced, and also to compensate for the frequent defects such as failure to inject synthetic resin in the 3D curved product in the infusion method. .

The amount of synthetic resin injected in the synthetic resin injection process (R104) is preferably 50 to 60% by weight of the synthetic resin 40 to 50% by weight to impregnate the fabric. If the injection amount of the synthetic resin impregnated into the fabric layer is less than 40% by weight, the moldability of the prepreg plate produced in a later step may be deteriorated. If the injection amount of the synthetic resin exceeds 50% by weight, the injection amount of the synthetic resin As compared to the relatively low content of the fabric there is a fear that the mechanical properties deteriorate.

For reference, FIGS. 6A to 6C, which are attached to the present invention, show a process of sealing the first ply into a mold and then sealing it with a bagging film for molding in an infusion process. It's about photography.

First, as shown in FIG. 6a, first the first ply is laminated on the upper surface of the lower mold 20, and then sealed using a bagging film on the outside thereof, as shown in FIG. As shown in 6c, the internal air is discharged to the outside to inject the synthetic resin under vacuum at a pressure of -722 to -798 mmHg.

In the prepreg plate manufacturing process (R200), a prepreg plate forming process (R201) of manufacturing a prepreg plate by laminating the prepreg on a separate mold and then forming a high temperature by vacuum high temperature molding, and trimming the formed prepreg plate into a predetermined shape The prepreg board is manufactured through the finishing process (R202).

The prepreg used in this process is preferably selected from uni-directional carbon / epoxy prepreg or carbon fabric / epoxy prepreg, and the prepreg laminated to the mold is -722 to-. 798 mmHg under pressure of 100 ~ 120 ℃ at a vacuum pressure produced and then subjected to the finishing process (R202) of trimming.

The number of prepregs to be laminated on the prepreg plate is preferably 10 to 15 ply for the upper plate and 25 to 35 ply for the lower plate, but is not necessarily limited to the number of the above stacked sheets. It can be adjusted accordingly.

For reference, the prepreg plate is preferably impregnated with 30 to 40% by weight of synthetic resin in 60 to 70% by weight of the fabric. If the impregnated amount of the synthetic resin impregnated into the fabric layer is less than 30% by weight, the moldability of the prepreg plate may decrease. If the impregnated amount of the synthetic resin exceeds 40% by weight, the synthetic resin is excessively impregnated. As the content of the fabric decreases, there is a fear that the mechanical properties decrease.

If the vacuum molding conditions deviate from the vacuum conditions in this process, there is a fear that the prepreg plate is not molded properly.

And the sheet material manufacturing process (R300) according to the present invention is a bonding step (R301) and the finishing step (R202) by applying a synthetic resin to the first ply infusion (infusion) molded in the synthetic resin injection step (R104) The trimmed prepreg plate is laminated on the first ply coated with synthetic resin in the synthetic resin coating process (R300), and the same method as the sealing process (R103) using a bagging film. Wrap it with a bagging film on the outside of the prepreg plate laminated on top of the fabric layer coated with synthetic resin, seal it tightly with the mold using a sealant, and then go through the sealing process (R302), and then harden it at room temperature or an appropriate high temperature. Through the forming step (R303) to make a top plate and a bottom plate of the sandwich face material, respectively.

Synthetic resin used in the bonding step (R301) is preferably used by selecting one type of polyester resin or vinyl ester resin.

In addition, the molding step (R303) is preferably molded at room temperature or 70 ~ 80 ℃ temperature.

For reference, FIG. 7 relates to a photograph of a state in which a prepreg plate is laminated on a first ply manufactured by an infusion method to produce a face plate by high temperature vacuum molding.

When the plate is manufactured by the infusion method in the above process, it is difficult to satisfy the rigidity or mechanical performance of the plate due to high synthetic resin ratio. In order to compensate for this, a multi-layered material of carbon fabric / epoxy prepreg or unidirectional carbon / epoxy prepreg is fabricated by high temperature vacuum forming and trimming, and then trimmed and attached to the lower mold 20 as it is on the infused first ply. Bonded with the same resin and bagged with a film as shown in FIG.

Therefore, the sandwich-type composite plate produced according to the present invention can obtain improved mechanical performance by the above-described process and a fairly uniform result even in X-ray transmittance with uniform thickness and uniform resin amount.

And the sandwich type composite plate manufacturing process (R400) according to the present invention is a synthetic resin coating process (R401) for applying a polyester resin or vinyl ester resin on the surface of the sanded sandwich face material and the upper and lower plates and the foam foam contact each other , Sandwich type composite plate is manufactured through a core material insertion process (R402) for inserting and bonding the core material between the upper and lower faceplates coated with synthetic resin, and a molding process (R403) for clamping and fixing and curing at room temperature or 70 to 80 ° C. It is a process to do it.

8A and 8B in the present invention relates to a picture taken before the lamination of the foam foam core between the upper and lower face plates after peeling the vinyl from the prepreg plate to the mold (lower mold).

After removing the bagging film from the face plate of the upper and lower plates produced by the above process, and then applying a synthetic resin, PMI (Polymethacrylimide) foam processed to the desired design shape as shown in Figure 8a Select one type from among urethane foam or PVC foam and insert the upper and lower plate molds 10 and 20 between the upper and lower plate face plates as shown in FIG. 8B, and insert the upper and lower plate molds 10 and 20 as shown in FIG. 9. Clamping, fixing, bonding, and curing at room temperature or 75 ~ 85 ℃ produce sandwich type composite board.

In the present invention, the curing temperature is not necessarily limited to the above-mentioned temperature and may be appropriately adjusted according to the type of material to be used.

In addition, the finishing process (R500) according to the present invention is a finishing process to remove the bur (bur) of the sandwich-type composite plate manufactured through the above process.

Therefore, the sandwich type composite member manufactured through the above process is manufactured with a composite member having a smooth curved surface as shown in FIG. 3.

For reference, Figure 10 is another embodiment according to the present invention, relates to a photograph taken a bumper for a vehicle manufactured according to the method of the present invention.

As described above, the sandwich-type composite plate prepared according to the present invention has a beautiful surface layer of the composite plate, a beautiful surface layer of the composite plate, a beautiful surface layer of the composite plate, and the molded laminated members have a uniform thickness and a uniform synthetic resin impregnation. It is expected that the application range will be expanded in the future as it is possible to manufacture sandwich type composite plate having high mechanical strength and curved surface by maintaining the amount. In addition, the sandwich-type composite plate produced by the method of the present invention has a smooth surface, and is beautiful and omits the sanding process and the coating process for coating the outer surface of the composite plate, thereby simplifying the process and reducing the defective rate, resulting in low productivity. High is an advantage.

As described above, the manufacturing method of the sandwich composite plate according to the preferred embodiment of the present invention has been shown in accordance with the above description and drawings, but this is merely described for example and various within the scope without departing from the technical spirit of the present invention. It will be understood by those skilled in the art that variations and modifications are possible.

1 is a flow chart showing a process of manufacturing a sandwich type composite plate by a conventional hand lay-up (hand lay-up) method,

Figure 2 is a flow chart showing a process of manufacturing a sandwich-type composite plate by a conventional Infusion (Infusion) method,

3 is a sandwich type composite member having a curved surface manufactured according to the present invention, a photograph showing a patient's medical pedestal (table or cradle) for X-ray imaging or tomography,

4 is an embodiment according to the present invention, a flowchart showing a process of manufacturing a sandwich-type composite plate by combining a hand lay-up method and an infusion method,

5 to 9 relate to a photograph taken by a process of manufacturing a sandwich-type composite plate (eg, medical pedestal) according to the present invention,

5 is a photograph taken a preparation state for applying to the mold with a release agent,

6A to 6C are photographs showing a process of sealing the first ply into a mold and then sealing it with a bagging film for molding in an infusion method;

FIG. 7 is a photograph showing a state in which a prepreg plate is laminated on a first ply manufactured by an infusion method to produce a face plate by high temperature vacuum molding,

8A and 8B are photographs taken of the state before peeling the vinyl from the prepreg plate to the mold (lower mold) and laminating the foam foam core between the upper and lower face plates;

Figure 9 is a photograph of the process of molding by clamping and fixing the upper and lower plate molds, then

10 is another embodiment according to the present invention relates to a photograph of a bumper for an automobile.

Explanation of symbols on the main parts of the drawings

10: upper type 20: lower type

30: foam

Claims (8)

delete In the manufacturing method of the sandwich composite plate material, After applying a release agent several times to a mold made into a desired shape, and then laminating the fabric 1 ply (ply), wrapped the laminated fabric with a bagging film on the outside and then sealed with a sealant and then synthetic resin Fabric layer manufacturing process (R100) for producing a fabric layer by injecting; A prepreg plate manufacturing process (R200) by vacuum molding using a prepreg in a separate mold; After the synthetic resin is applied to the fabric layer and laminated on the prepreg plate on the upper surface plate production process (R300) for manufacturing the upper plate and the lower plate of the sandwich-type face plate by vacuum molding, respectively; A sandwich type composite plate manufacturing process (R400) for inserting and molding a foamed foam core between the upper faceplate and the lower faceplate; Finishing process (R500) for removing the bur (bur) of the molded sandwich composite plate; Method for producing a sandwich type composite plate, characterized in that it is manufactured through. 3. The method of claim 2, In the fabric layer manufacturing process (R100), the fabric is a method of producing a sandwich type composite plate, characterized in that used to select one or more of the carbon fiber fabric or glass fiber fabric. 3. The method of claim 2, The synthetic resin is a method for producing a sandwich-type composite plate, characterized in that used by selecting one type of polyester resin or vinyl ester resin. 3. The method of claim 2, In the prepreg plate manufacturing process (R200), the prepreg is a unidirectional carbon (Uni-direction) / epoxy prepreg or carbon fabric / epoxy prepreg manufacturing method of the sandwich-type composite plate, characterized in that. 3. The method of claim 2, The method of manufacturing a sandwich-type composite plate, characterized in that the synthetic resin in the face plate production process (R300) is used by selecting one type of polyester resin or vinyl ester resin. 3. The method of claim 2, Vacuum forming in the face plate manufacturing process (R300) is carried out by wrapping a bagging film on the outside of the prepreg plate laminated on top of the fabric layer coated with synthetic resin, and then sealingly contacting the mold using a sealant. Method for producing a sandwich-type composite plate, characterized in that. 3. The method of claim 2, Foam foam core in the sandwich composite plate manufacturing process (R400) is a manufacturing method of the sandwich composite plate, characterized in that the use of one selected from PMI (Polymethacrylimide) foam, urethane foam or PVC foam.

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