KR100997447B1 - Fiber Reinforced Plastic and Method for Producing Thereof - Google Patents

Abstract

Disclosed are fiber reinforced plastics and methods of making the same. The fiber-reinforced plastics of the present invention and a manufacturing method thereof include a plurality of fiber mats each formed by gathering a plurality of fiber yarns and having a sheet shape; A mat binding sewing thread for sewing a plurality of fiber mats stacked in a height direction; And it is characterized in that it comprises a synthetic resin which is combined with the fiber mat sewn by the mat-binding sewing thread and cured to a predetermined shape. According to the present invention, it is possible to increase the bonding strength of the fiber mat and the synthetic resin to facilitate the invasion of the synthetic resin while improving the productivity.

Fiber reinforced plastic, FRP, roving cloth, felt strand, sewing

Description

Fiber Reinforced Plastic and Method for Producing Thereof}

The present invention relates to a fiber-reinforced plastic and a method for manufacturing the same, and more particularly, to a fiber-reinforced plastic and a manufacturing method thereof, which can increase the bonding strength of the fiber mat and the synthetic resin to facilitate the invasion of the synthetic resin while improving the productivity It is about a method.

Fiber Reinforced Plastics (FRP) is a composite of synthetic resin and fiber reinforcement, which not only maintains the advantages of corrosion resistance and ease of molding, but also tensile strength, impact resistance and heat resistance due to the added fiber reinforcement. It is a composite material that can get additional advantages.

Such fiber-reinforced plastics are used in various fields such as hulls, bathtubs, septic tanks, helmets, etc. of small vessels because of their low cost and light weight, and the technical fields used are gradually increasing.

1 is a broken perspective view of a fiber-reinforced plastic according to a conventional embodiment, as shown in this, the fiber-reinforced plastic 101 according to a conventional embodiment, the fiber yarn is randomly distributed as a fiber reinforcement material And a synthetic resin 150 that is cured to maintain a predetermined shape in combination with the fiber mat 110.

By the way, in the fiber-reinforced plastic 101 according to the conventional embodiment, in order to manufacture to have a predetermined shape, such as a septic tank, the thickness should be increased thickly, and for this purpose, a fiber mat in which the fiber yarns 103 are dispersed and disposed ( It is necessary to increase the thickness of the 110, when using the thick fiber mat (110) for productivity, because the large amount of fiber yarn 103 is randomly distributed and disposed synthetic resin 150 is the interior of the fiber mat (110) Insufficiently invaded in the synthetic resin 150 and the fiber mat 110, the binding force is weakened, in order to prevent the thin fiber mat 110 to be laminated in a predetermined shape while forming a predetermined shape, there is a problem that the productivity is lowered.

In order to solve this problem, instead of increasing the thickness of the fiber mat 110, there is an effort to increase the thickness of the fiber-reinforced plastic 101 by increasing the amount of the synthetic resin 150, but the amount of the synthetic resin 150 used There is a problem that the cost is increased by a large increase, the amount of the fiber yarn 103 is insufficient compared to the amount of the synthetic resin 150 to fully exhibit the function as the fiber-reinforced plastic (101).

Accordingly, there is a need for the development of fiber-reinforced plastics that can improve productivity, but also facilitate the invasion of synthetic resins and increase the bonding strength of the fiber mats and synthetic resins.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fiber-reinforced plastic and a method for manufacturing the same, which can improve productivity while making it easier to invade synthetic resins, thereby increasing the bonding force between the fiber mat and the synthetic resin.

According to the present invention, a plurality of fiber mat is formed by a plurality of fibers are gathered, respectively, a plurality of fiber mats are provided in a sheet (sheet) shape; A mat binding sewing thread for sewing the plurality of fiber mats stacked in a height direction; And it is achieved by a fiber-reinforced plastic, characterized in that it comprises a synthetic resin which is combined with the fiber mat sewn by the mat-binding sewing thread and cured to a predetermined shape.

Here, it is preferable that the fiber reinforced plastic further includes the fiber yarn assembly provided between the said some fiber mat, and in which the some fiber yarn is arrange | positioned.

The fiber mat may include a plurality of fiber wires each of which is provided with a plurality of fiber yarns gathered together and arranged in parallel with each other; And a wire binding sewing thread that crosses the plurality of fiber wires and binds the plurality of fiber wires.

The mat-binding sewing thread is disposed along the transverse direction of the plurality of fiber wires, and it is preferable to sew the plurality of fiber mats regularly while moving through the zigzag type along the thickness direction of the fiber mat.

In addition, the fiber mat may be a mat in the form of a chopped strand in which a plurality of fiber yarns are arranged to form a sheet.

It is preferable that the mat binding sewing thread moves through the zigzag type along the thickness direction of the fiber mat so that the mats in the form of the strand strand are stacked together and sew the plurality of fiber mats regularly. .

The fiber yarn may be made of any one of glass fiber, carbon fiber, and Kevlar.

On the other hand, the above object, according to the present invention, each of the plurality of fiber yarns are formed by aggregating, arranging a plurality of fiber mats provided in a sheet shape in the height direction; A sewing step of sewing by a mat binding sewing thread to bind the plurality of fiber mats to each other; And it is also achieved by a fiber-reinforced plastic manufacturing method comprising a hardening step, by combining a plurality of fiber mats sewn by the mat-binding sewing thread to cure a synthetic resin to a predetermined shape.

Wherein the arranging step comprises: arranging one said fiber mat; Supplying fiber yarns on the arranged fiber mats to form a fiber yarn aggregate; And arranging the other fiber mat on the fiber yarn assembly.

The fiber mat may include a plurality of fiber wires, each of which is provided by gathering a plurality of fiber yarns and arranged side by side; And it is preferable to include a wire binding sewing thread to the horizontal direction of the plurality of fiber wires, and to bind between the plurality of fiber wires.

In the sewing step, the mat-binding sewing thread is disposed along the transverse direction of the plurality of fiber wires, moving through the zigzag type along the thickness direction of the fiber mat, and regularly sewing between the plurality of fiber mats It is desirable to.

The fiber mat is a chopped strand-shaped mat in which fibers are randomly arranged, and in the sewing step, the mat-binding sewing thread has a thickness of the fiber mat so that the mat of the chopped strand-type is stacked and bound together. It is preferable to regularly sew between the plurality of fiber mats while moving in a zigzag manner along the direction.

The curing step may be cured by a curing agent of any one of hexamethylenetetramine, amines and polyamide.

According to the present invention, it is possible to increase the bonding strength of the fiber mat and the synthetic resin to facilitate the invasion of the synthetic resin while improving the productivity.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

Figure 2 is a perspective view showing the configuration of a fiber reinforced plastic according to an embodiment of the present invention, Figure 3 is an exploded perspective view of Figure 2, Figure 4 is a perspective view showing a fiber mat of the roving cloth type shown in Figure 3 5 is a perspective view showing a shape in which the pair of fiber mats shown in FIG. 3 and the fiber yarn aggregates interposed therebetween are sewn by the mat-binding reinforcing chamber.

As shown in these drawings, the fiber-reinforced plastic 1 according to an embodiment of the present invention, a plurality of fiber yarns (3, see Fig. 5) are formed in a plurality, each formed in a sheet (sheet) shape A fibrous fiber assembly 20 provided between the fibrous mat 10 and the plurality of fibrous mats 10, wherein the plurality of fibrous yarns 4 (see FIG. 3) are uniformly arranged at random, and the plurality of fibers. Mat mat sewing thread 30 for sewing between the plurality of fiber mat 10 and the fiber yarn assembly 20 so that the mat 10 and the fiber yarn assembly 20 are bound to each other, and are combined with these to be cured into a predetermined shape Synthetic resin 50 is included.

First, each of the plurality of fiber mats 10 is provided as a fiber mat 10 in the form of a roving cloth. As shown in FIG. 4, the fiber mat 10 of the roving cloth form is parallel with a plurality of fiber wires 11 provided with a plurality of fiber yarns 3 (refer to FIG. 5) formed in the longitudinal direction. And a wire binding sewing thread 15 for binding the plurality of fiber wires 11 arranged to each other.

Each of the plurality of fiber wires 11 is provided by rotating a plurality of fiber yarns 3 (see FIG. 5) having a longitudinal direction substantially in parallel and then rotating by a predetermined angle in one direction. The yarns 3 can be prevented from being separated from each other. In this case, by varying the number of fiber yarns 3 constituting each of the fiber wires 11, the thickness of the fiber mat 10 can be controlled to some extent, and thus, there is an advantage that it can be applied to various products.

Here, the fiber wire 11 has been described above that the plurality of fiber yarns 3 are formed by agglomeration. As the fiber yarns 3, aromatic nylon fibers such as glass fibers, carbon fibers, and Kevlar may be used. In particular, when glass fibers having a diameter of 0.1 mm or less are used as the fiber yarns (3), not only the heat resistance, tensile strength, impact resistance and corrosion resistance of the fiber reinforced plastics (1) can be improved, but also the weight can be reduced. May have

On the other hand, these fiber wires 11 are arranged side by side in one direction, and are stitched and bound by the wire binding sewing thread 15. As shown in FIG. 4, the wire binding sewing thread 15 is regularly arranged toward the transverse direction of the fiber wire 11, and each wire binding sewing thread 15 may be firmly bound between the fiber wires 11. ) Is sewn in a sewing pattern passing through the top of one fiber wire 11 and then passing through the bottom of the adjacent fiber wire 11, that is, alternately through the fiber wire (11). Therefore, when the plurality of fiber wires 11 are bound by the wire binding sewing thread 15, the fiber mat 10 has a regular shape, and the binding of the plurality of fiber wires 11 and the wire binding sewing thread 15 is performed. Through-holes 13 through which the synthetic resin 50 can pass are formed in a portion thereof, and the synthetic resin 50 is disposed between the fiber mats 10 and between the plurality of fiber mats 10. It is easy to invade.

The wire binding sewing thread 15, as the fiber wire 11 may be provided by gathering the fiber yarns, it may be provided as a general thread for the convenience of production.

Meanwhile, the fiber yarn assembly 20 is an aggregate of fiber yarns 4 disposed between the fiber mats 10, as shown in FIG. 3, and after the fiber mats 10 are disposed on the upper surface of the table, the fibers A pair of fiber mats 10 is provided by dispersing the fiber yarns 4 on the top surface of the fiber mat 10 by a supply device (not shown) for supplying the yarns 4 and then covering the fiber mat 10 on the top surface. Fiber yarn assembly 20 may be disposed between. This makes the fiber yarn assembly 20 occupy one thickness of the fiber reinforced plastic (1), which can increase the thickness of the fiber reinforced plastic (1) using only a small amount of the synthetic resin (50), thus reducing the cost Means you can save.

When the fiber mat 10 is disposed on the upper and lower portions of each of the fiber yarns 4 constituting the fiber yarn assembly 20, the sewing operation is performed by the mat-binding sewing thread 30 to be described later. It is possible to prevent the fiber yarn 4 from being separated to the outside, the synthetic resin 50 passing through the through hole 13 formed between the fiber mat 10 is each fiber yarn 4 of the fiber yarn assembly 20 After smoothly infiltrating between the) hardened to obtain the effect of strengthening the binding force between the synthetic resin 50 and the fiber mat (10).

As such, in the embodiment of the present invention, the fiber mat 10 disposed on the upper and lower portions of the fiber yarn assembly 20 is bound by the mat binding sewing thread 30 instead of the adhesive, so that the invasion of the synthetic resin 50 is performed. It can be made much easier than before.

On the other hand, when the plurality of fiber mat 10 and the fiber yarn assembly 20 is disposed between the fiber mat 10 and immediately cured by the synthetic resin 50, the binding force between the fiber mat 10 and the fiber mat ( There is a fear that the binding force between 10) and the fiber yarn assembly 20 is weakened. That is, there is a fear that the overall durability is lowered. Therefore, in this case, the adhesive can be used to bond the fibers between the mats 10.

In the case of the present invention, however, the plurality of fiber mats 10 are sewn by the mat-binding sewing thread 30. As shown in FIG. 5, the mat-binding sewing thread 30 of the present embodiment moves between a pair of fiber mats 10 arranged in the upper and lower portions about the fiber yarn assembly 20 in a zigzag manner. It plays a role of firmly binding between the fiber mat (10).

In more detail, the mat binding sewing thread 30 is regularly sewn toward the transverse direction of the fiber wire 11 of the fiber mat 10, and the fiber mat 10 on the upper side and the fiber mat on the lower side. The fibers 10 are sewn in the thickness direction of the fiber mat 10 and the fiber yarn assembly 20 so that they can be bound together. At this time, the mat binding sewing thread 30 may be sewn through the through hole 13 formed in the fiber mat 10, and thus a zigzag sewing pattern may be implemented as shown in FIG.

That is, the mat-binding sewing thread 30 passing through the through hole 13 of the fiber mat 10 provided in the upper part passes through the fiber yarn assembly 20 and then passes through the fiber mat 10 in the lower part. After passing through, the mat binding sewing thread 30 again moves in the reverse direction to firmly bind between the fiber mat 10 and the fiber yarn assembly 20. However, in the present embodiment, it has been described above that the fiber mat 10 is sewn in a regular sewing pattern by the mat binding sewing thread 30, but if the plurality of fiber mat 10 can be sewn between the mat binding sewing thread 30 This may be sewn irregularly.

As such, in the embodiment of the present invention, the fiber mat 10 disposed on the upper and lower portions of the fiber yarn assembly 20 is bound by the mat binding sewing thread 30 instead of the adhesive, so that the invasion of the synthetic resin 50 is performed. It can be made much easier than before.

On the other hand, the sewing of the mat-binding sewing thread 30 is made by a decay machine (not shown), that is, an industrial sewing machine is firmly, and this has the advantage that the time required for manufacturing is shortened than in the prior art to improve productivity.

Mat binding sewing thread 30, a general thread may be used, if the production is easy, a plurality of fiber yarns are assembled in the longitudinal direction may be used. In this way, the mat binding sewing thread 30 can be firmly coupled between the plurality of fiber mat (10), which is due to the fiber reinforced with improved durability compared to the conventional binding method of binding between the plurality of fiber mat using an adhesive Plastic 1 can be implemented. In addition, the invasion of the synthetic resin 50 is not only easily made, the shape is not easily disturbed.

Meanwhile, the synthetic resin 50 (see FIGS. 2 and 3) is hardened so as to maintain a predetermined shape after invading the fiber mat assembly 20 disposed between the fiber mat 10 and the fiber mat 10. As described above, the synthetic resin 50 is smoothly infiltrated between the through-hole 13 formed in the fiber mat 10 and the through-hole 21 formed in the fiber yarn assembly 20 so that the fiber mat 10 and It may be firmly combined with the fiber yarn assembly 20. The synthetic resin 50 is preferably used a thermosetting resin such as unsaturated polyester, epoxy resin, in particular, when using an unsaturated polyester can be molded at room temperature, atmospheric pressure to improve physical properties such as flame resistance, corrosion resistance There is an advantage.

In addition, the synthetic resin 50 is combined with the fiber mat assembly 20 disposed between the fiber mat 10 and the fiber mat 10, and then cured, thereby forming a predetermined shape of the fiber-reinforced plastic 1 according to the present embodiment. It plays the role of a sustainable matrix. Therefore, by curing the synthetic resin 50 to have a predetermined shape as needed, the fiber-reinforced plastic (1) is applied to a variety of products such as hulls, bathtubs, septic tanks, chemical tanks, interiors, containers, tennis rackets, helmets and aircraft aircraft of small vessels It may have a suitable shape.

In this case, the synthetic resin 50 composited with the fiber mat 10 and the fiber yarn assembly 20 is cured by a curing agent (not shown), and hexamethylenetetramine, amines and polyamide may be used as the curing agent. In order to catalyze, a curing accelerator such as a tertiary amine may be used.

Hereinafter, the manufacturing method of the fiber reinforced plastics 1 which have such a structure is demonstrated.

6 is a flowchart sequentially showing a method of manufacturing a fiber-reinforced plastic according to an embodiment of the present invention, as shown in the drawing, a method of manufacturing the fiber-reinforced plastic 1 according to an embodiment of the present invention, respectively The arrangement step (S10) for arranging the plurality of fiber mat 10 is assembled in the form of a sheet gathered fiber yarns 3, and the mat binding sewing thread 30 to bind the plurality of arranged fiber mat 10 to each other And a curing step (S30) of combining the synthetic resin 50 to a plurality of fiber mats 10 sewn by the mat-binding sewing thread 30, and curing them into a predetermined shape. .

First, the arrangement step (S10) of arranging the plurality of fiber mat 10, the step (S11) of arranging the roving cloth-shaped fiber mat 10, and the fiber yarn (4) on the arranged fiber mat 10 Supplying randomly to form the fiber yarn assembly 20 (S12), and the step of placing another fiber mat 10 on the fiber yarn assembly 20 (S13).

Here, the fiber mat 10 of the roving cloth form is arranged horizontally of the plurality of fiber wires 11 after arranging a plurality of fiber wires 11 provided with a plurality of fiber yarns 3 assembled together. It can be provided by binding between the plurality of fiber wires 11 by a plurality of wire binding sewing thread 15 arranged regularly in the direction. That is, the fiber mat 10 of the roving cloth type is provided by coupling the plurality of fiber wires 11 and the plurality of wire binding sewing threads 15 to twist each other.

On the other hand, sewing step (S20) is a step of sewing between the plurality of arranged fiber mat 10 and the fiber yarn assembly 20 disposed between them by the mat binding sewing thread 30. The mat-binding sewing thread 30 is sewn along the transverse direction of the fiber wire 11 of the fiber mat 10, but is zigzag penetrated along the thickness direction of the fiber mat 10 to move between the stacked fiber mats 10. Can bind. However, in the present embodiment, when sewing between the fiber mat 10 by the mat-binding sewing thread 30, it is described as sewing by a regular sewing pattern, but if you can firmly bind between the fiber mat 10 is irregular Sewing may be done by sewing patterns.

On the other hand, the step of combining the synthetic resin 50 in the fiber mat 10 and the fiber yarn assembly 20 sewn by the mat-binding sewing thread 30 to cure to a predetermined shape, the fiber mat 10 and the fiber mat 10 After compounding the synthetic resin 50 to the fiber yarn assembly 20 disposed between the), and curing by adding a curing agent such as hexamethylenetetramine, amines and polyamide. At this time, a plurality of custom holes 13 are formed in the fiber mat 10, and a plurality of synthetic resins 50 may invade between the fiber yarn assemblies 20 disposed between the fiber mat 10. Since the through holes 21 are provided, the synthetic resin 50 can smoothly infiltrate between the fiber mat 10 and the fiber yarn assembly 20, and thus, the fiber mat 10 and the fiber yarn assembly 20 are provided. And, the synthetic resin 50 can be strongly bound.

However, in addition to the above-described hardener, if the synthetic resin 50 combined with the fiber yarn assembly 20 disposed between the fiber mat 10 and the fiber mat 10 can be cured to maintain a predetermined shape, any other hardener may be used. It may be hardened. In addition, a method of naturally curing without adding a separate curing agent will also belong to the scope of the present invention.

Thus, according to one embodiment of the present invention, by sewing the plurality of fiber mat 10 between the mat binding sewing thread 30 can not only strengthen the binding force between the fiber mat 10 without using an adhesive, Due to this, the invasion of the synthetic resin 50 can be easily performed to implement improved durability than in the related art, and sewing can be made by a machine which is a simple equipment, thereby reducing the production cost and further improving the productivity.

On the other hand, with reference to the accompanying drawings will be described a fiber reinforced plastic according to another embodiment of the present invention. However, the same as described in the fiber-reinforced plastic according to an embodiment of the present invention will be omitted.

FIG. 7 is a perspective view illustrating fiber strands in the form of bolt strands provided in the fiber-reinforced plastic according to another embodiment of the present invention, and FIG. 8 is a pair of fiber mats shown in FIG. 7 and fiber yarns interposed therebetween. It is a perspective view which shows the shape in which the aggregate was sewn by the mat-binding reinforced chamber.

As shown in these figures, the fiber mat 10a of the fiber reinforced plastic 1a according to the present embodiment is provided as a mat 10a in the form of a chopped strand. That is, in the above-described embodiment, if a fiber mat 10 (see FIG. 4) in the form of a roving cloth is applied, a fiber mat 10a in the form of a different strand is applied in this embodiment.

The fiber mat 10a in the form of a chopped strand is appropriately cut after the length of the fiber yarn 3a, disposed in an undirected direction, and pressed to a uniform thickness, and then using a binder (not shown). To the fiber mat 10a molded into a sheet shape. This type of fiber mat (10a) has the advantage that it is easy to manufacture because it does not have to be arranged regularly, and also through holes (13a) are formed between the irregularly arranged fiber yarns (3a) synthetic resin (not shown) ) Provides a passage through which the synthetic resin can invade and thereby increase the binding force between the fiber yarn assembly 20a disposed between the fiber mat 10a and the fiber mat 10a and the synthetic resin.

Meanwhile, the mat binding sewing thread 30a may be regularly sewn along one direction of the fiber strand 10a in the form of a chopped strand, instead of the adhesive, and the plurality of fiber mats 10a may be interposed between the mating sewing thread 30a. If it can be firmly tied, it may be sewn irregularly.

As described above, according to another embodiment of the present invention, the fabric mat 10a in the form of a chopped strand may be applied, thereby facilitating the fabrication of the fiber mat 10a, and thus, the productivity may be improved.

In the above-described embodiment, the fiber mat in the form of a roving cloth is disposed on both sides with the fiber yarn assembly therebetween. In addition, in the above-described other embodiments, the fiber strands in the form of chopped strands are arranged on both sides with the fiber yarn aggregates interposed therebetween, but the roving cloth-shaped fiber mats are formed on one side with the fiber yarn aggregates interposed therebetween, After arranging the fibrous mats, these livers may be sewn with a mat-binding sewing thread, and other types of fibrous mats may be applied.

In addition, in the above-described embodiments and other embodiments, the fiber yarn assembly is disposed between the plurality of fiber mats, but only the fiber mat without the fiber yarn assembly may be sewn after sewing.

As described above, the present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

1 is a broken perspective view of a fiber-reinforced plastic according to a conventional embodiment.

Figure 2 is a perspective view showing the configuration of a fiber reinforced plastic according to an embodiment of the present invention, Figure 3 is an exploded perspective view of Figure 2, Figure 4 is a perspective view showing a fiber mat of the roving cloth type shown in Figure 3 5 is a perspective view showing a shape in which the pair of fiber mats shown in FIG. 3 and the fiber yarn aggregates interposed therebetween are sewn by the mat-binding reinforcing chamber.

6 is a flowchart sequentially showing a method of manufacturing a fiber-reinforced plastic according to an embodiment of the present invention.

7 is a perspective view showing a fiber mat in the form of bolt strands provided in the fiber-reinforced plastic according to another embodiment of the present invention.

FIG. 8 is a perspective view showing a shape in which the pair of fiber mats shown in FIG. 7 and the fiber yarn aggregates interposed therebetween are sewn by the mat binding reinforcement chamber. FIG.

* Explanation of symbols for the main parts of the drawings

1: fiber reinforced plastic 3, 4: fiber yarn

10: fiber mat 11: fiber wire

15: wire binding sewing thread 20: fiber yarn assembly

30: mat binding reinforcement chamber 50: synthetic resin

Claims (13)

A plurality of fibrous yarns are gathered and provided, and each includes a plurality of fiber wires arranged in parallel with each other, and a wire binding sewing thread for binding the plurality of fiber wires in a horizontal direction of the plurality of fiber wires ( a plurality of fiber mats provided in a sheet shape; A fiber yarn assembly provided between the plurality of fiber mats and disposed in a state in which a plurality of fiber yarns are scattered; It is arranged along the transverse direction of the plurality of fiber wires, the fiber mat between the fiber mat and the fiber composites stacked in the height direction while moving through the zigzag (Zigzag) type along the thickness direction of the fiber mat and the fiber yarn assembly. Mat-binding sewing thread for regular sewing; And Fiber-reinforced plastic, characterized in that it comprises a synthetic resin which is hardened to a predetermined shape by being combined with the fiber mat, a fiber yarn composite sewn by the mat binding sewing thread. delete delete delete delete delete The method of claim 1, The fiber yarn, fiber-reinforced plastics, characterized in that provided by any one of glass fiber, carbon fiber and Kevlar (Kevlar) material. A plurality of fiber yarns are provided in a sheet form, each including a plurality of fiber wires are arranged side by side, and a wire binding sewing thread for lateral direction of the plurality of fiber wires, and binding between the plurality of fiber wires. Arrange one fiber mat to be prepared, Spreading the fiber yarn on the arranged fiber mat to cover the fiber mat to a certain thickness to form a fiber yarn assembly, Arranging the other one of the fibrous mats on the fibrous assembly; In order to bind the plurality of fiber mats and fiber yarn assemblies to each other, a mat binding sewing thread is disposed along the transverse direction of the plurality of fiber wires and penetrates in a zigzag manner along the thickness direction of the fiber mat and the fiber yarn composite. Moving and sewing the plurality of fiber mats and fiber yarn composites regularly; And And a curing step of combining a plurality of fiber mats and a fiber yarn composite sewn by the mat-binding sewing thread to cure a synthetic resin to a predetermined shape. delete delete delete delete delete

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