KR101599477B1 - Carbon fiber complex formed by coating twisted carbon fiber with thermoplastic resin, manufacturing method thereof, and manufacturing apparatus thereof - Google Patents

Abstract

The present invention relates to a carbon fiber composite material in which a TW fiber end is coated with a thermoplastic resin, a method for manufacturing the carbon fiber composite material, and an apparatus for manufacturing the carbon fiber composite material. More particularly, The present invention relates to a method and an apparatus for coating a thermoplastic resin on an outer circumferential surface by forming a fiber end and pressurizing air with a simple and simple process and easily controlling the content of carbon fiber, A method of manufacturing the carbon fiber composite material, and a manufacturing apparatus therefor, wherein the TW fiber end is coated with a thermoplastic resin, the carbon fiber composite material being capable of containing the long carbon fiber compared to the product.

Description

TECHNICAL FIELD The present invention relates to a carbon fiber composite having a TW fiber end coated with a thermoplastic resin, a method for manufacturing the carbon fiber composite, and a manufacturing method of the carbon fiber composite, and a manufacturing apparatus for the TW fiber bundle.

TECHNICAL FIELD The present invention relates to a thermoplastic resin-coated carbon fiber composite material, a method of manufacturing the same, and an apparatus for manufacturing the carbon fiber composite material, and more particularly, to a carbon fiber composite material having thermoplastic resin coated thereon, which comprises twisting at least two continuous carbon fibers individually discharged one by one, The present invention relates to a method for coating a thermoplastic resin on an outer circumferential surface through air pressurization, a method for producing the same, and a composite made by the method, wherein the process is simple and easy, the carbon fiber content can be easily controlled, The present invention relates to a carbon fiber composite material coated with a thermoplastic resin, which is superior in strength to conventional resin products, and a method of manufacturing the same and an apparatus for manufacturing the same.

Thermoplastic resins are strong against impact absorption, fracture toughness, and creep because they have better toughness than thermosetting resins. In addition, demand for thermoplastic resin composite materials is increasing due to the recent increase in the necessity of recycling of resources.

On the other hand, thermoplastic resin products impregnated with carbon fiber are utilized in various fields such as civil engineering field, artificial satellite field, sports field, offshore structure field, wind turbine field, racing car field, electric and electronic communication field.

In the case of the carbon fiber, when the molded product is impregnated with the thermosetting resin, it has many difficulties and restrictions in the manufacturing process. In addition, there is also a problem that the manufactured product is not environmentally friendly due to difficulty in recycling. On the other hand, if the thermoplastic resin is utilized, it can be recycled, and the extrusion molding method can be applied to improve the convenience of the process.

A method and apparatus for producing a lightweight thermoplastic blend product in a continuous process is disclosed in US Patent Application Publication No. 7429305, filed on September 30, 2008, A manufacturing method and a manufacturing apparatus capable of eliminating the physical limit of the area in the mold and the oven and capable of producing at low cost have been proposed.

Further, in JP-A-2013-163888 (carbon fiber-reinforced thermoplastic resin composition and molded article, published on Aug. 23, 2013), a carbon fiber-reinforced thermoplastic resin composition having excellent interfacial adhesion between carbon fibers and thermoplastic resin and excellent mechanical properties .

However, in the case of the inventions described in the above-mentioned prior art documents, there is not proposed a technique of supplying a continuous strand of carbon fibers one by one and controlling them to coat the thermoplastic resin, so that the content ratio of the carbon fibers impregnated in the thermoplastic resin is There is a problem that it can not be controlled effectively and there is a problem that a molding apparatus or a molding method for improving the adhesion between the carbon fiber and the thermoplastic resin is not proposed in the coating process.

Further, in the case of the thermoplastic resin composite impregnated with carbon fiber, the longer the length of the carbon fiber introduced into the carbon fiber, the more excellent the physical properties are. However, the conventional techniques can not sufficiently impregnate the long fiber in the thermoplastic resin, There was a limit in improvement of physical properties.

U.S. Patent Publication No. 7429305 (September 30, 2008) Japanese Laid-Open Patent Publication No. 2013-163888 (2013.08.22)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a method for producing a thermoplastic resin composition, which comprises twisting at least two continuous carbon fibers individually discharged one by one, The present invention relates to a method for coating a carbon fiber on an outer circumferential surface of a carbon fiber, and a composite made therefrom, wherein the process is simple and easy, and the carbon fiber content can be easily controlled. A method for manufacturing the carbon fiber composite material, and a manufacturing apparatus for the same, which are provided with a TW fiber end coated with a thermoplastic resin.

In order to achieve the above object, a resin preparation step (S1) of measuring a thermoplastic resin pellet to be charged according to an embodiment of the present invention, followed by compression and kneading to prepare the thermoplastic resin (30); A carbon fiber preparation step (S10) of twisting at least two continuous carbon fibers (10) individually discharged one by one to form a TW-twisted carbon fiber (20); Coating a thermoplastic resin (30) on the outer circumferential surface of the TW-fiber end (20) to form a carbon fiber composite (A); Molding step (S30) of press-molding the carbon fiber composite (A); And a working step (S40) of cooling and cutting the press-molded carbon fiber composite (A), wherein the TW-fiber end is coated with a thermoplastic resin.

At this time, in the carbon fiber preparation step (S10), the TW-fiber end 20 includes at least one continuous carbon fiber 10 along the outer peripheral surface of the central fiber end 20a formed of at least one continuous- It is preferable that the TW-fiber end 20 is formed in such a manner as to spiral at least two or more continuous carbon fibers 10 in a spiral manner.

In the resin preparing step S1, the thermoplastic resin pellets are introduced into a screw-type extruder 100 made of a thermally conductive material to control the rotating speed of the screw or the groove interval of the screw, It is preferable to control the amount of the fluid 30.

In the coating step S20, the content of the TW-fiber end 20 in the carbon fiber composite A may be 5 to 20 wt% based on the total weight of the carbon fiber composite 20, It is preferable that the carbon fiber composite material (A) has a cross-sectional diameter (D) of 2 to 4 mm and a cut length (L) of 3 to 6 mm.

According to another aspect of the present invention, there is provided a thermoplastic resin-coated carbon fiber composite material produced by the method as described above.

According to another embodiment of the present invention, there is provided an extruder (100) for metering a thermoplastic resin pellet to be charged, followed by compression and kneading to supply a thermoplastic resin (30); A carbon fiber supply unit 200 for individually discharging the continuous-phase carbon fibers 10 one by one and supplying the TW-fiber ends 20 formed by spirally twisting at least two continuous-phase carbon fibers 10; A mixer 300 for coating the thermoplastic resin 30 on the outer circumferential surface of the TW-fiber end 20 to form a carbon fiber composite A; An air press molding device 400 for press-molding the carbon fiber composite material (A) through high-pressure air; A post-treatment unit (500) for cooling the press-molded carbon fiber composite (A); And a cutting device (600) for cutting the carbon fiber composite material (A) to a predetermined length. The apparatus for manufacturing a carbon fiber composite material coated with a thermoplastic resin.

The carbon fiber supply unit 200 includes a carbon fiber discharge unit 210 for individually discharging the continuous-phase carbon fibers 10 one by one; And a twist portion 220 spirally twisting at least two or more of the continuous carbon fibers 10 to form a TW fiber end 20. The twist portion 220 may be formed of the carbon fiber The continuous carbon fibers 10 discharged from the carbon fiber discharging portion 210 are separated from the center fiber bundle 10 by discharging the continuous carbon fibers 10 one by one while being connected to the outer circumferential surface of the discharge portion 210, It is preferable that the outer circumferential surface of the carbon fiber discharge portion 210 is spirally wound or spirally twisted at least two or more bundles of at least two continuous carbon fibers 10 discharged from the carbon fiber discharge portion 210.

The extruder 100 is preferably a screw extruder made of a thermally conductive material and controls the amount of the thermoplastic resin 10 prepared by controlling the rotation speed of the screw or adjusting the groove interval of the screw, The air compression molding apparatus 400 includes an outer tube 410 for filling high pressure air and an inner tube 420 through which the carbon fiber composite A is passed, At least one hole 421 is formed in a predetermined region of the outer circumferential surface so as to communicate with the outer tube 410 so that the outer circumferential surface of the carbon fiber composite A exposed through the hole 421 to the outer tube 410 is exposed It is more preferable to pressurize by the high-pressure air filled in the outer pipe 410.

The carbon fiber composite having the TW fiber end of the present invention coated with a thermoplastic resin as described above and an apparatus for producing the carbon fiber composite have a function of imparting an electromagnetic wave shielding function by impregnating a carbon fiber having electrical conductivity into the thermoplastic resin, It has improved strength by about 30% compared to glass fiber and has adopted coating method by easy extrusion and injection molding, which improves workability and is recyclable. It is more environment-friendly than the basic products, It is possible to twist two or more continuous carbon fibers discharged by controlling the number of carbon fiber strands to easily adjust the content ratio of the carbon fibers impregnated in the composite to meet the requirements of the product, And the strength between the carbon fiber and the thermoplastic resin is improved by introducing the air press molding device There is an effect to be further improved.

1 is a flow chart of a method for producing a carbon fiber composite in which a thermoplastic resin is coated on a TW fiber end according to a preferred embodiment of the present invention.
FIG. 2 is a schematic view showing the surface of the TW-fiber end formed by spirally winding according to the first embodiment of the present invention.
3 is a schematic view showing a surface of a TW fiber end formed by spirally twisting a whole carbon fiber bundle according to a second embodiment of the present invention.
4 is a schematic view showing a perspective view of a carbon fiber composite (A) coated with a thermoplastic resin on a TW-fiber end according to another preferred embodiment of the present invention.
5 is a schematic view schematically showing an apparatus for manufacturing a carbon fiber composite material in which a thermoplastic resin is coated on a TW fiber end according to a first embodiment of the present invention.
6 is a schematic view schematically showing an apparatus for producing a carbon fiber composite material in which a thermoplastic resin is coated on a TW fiber end according to a second embodiment of the present invention.
7 is a schematic diagram showing an air-pressurized molding apparatus 400 according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical concept of the present invention.

Throughout this specification, when an element is referred to as "including" an element, it is understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

In each step, the identification code is used for convenience of explanation, and the identification code does not describe the order of the steps, and each step may be performed differently from the stated order unless clearly specified in the context. have. That is, each of the steps may be performed in the same order as described, or may be performed substantially concurrently or in the reverse order.

The present invention relates to a method of manufacturing a carbon fiber composite including a resin preparation step (S1), a carbon fiber preparation step (S10), a coating step (S20), a molding step (S30), and a working step (S40) And an apparatus for manufacturing a carbon fiber composite including the extruder 100, the carbon fiber supply unit 200, the mixer 300, and the air press molding apparatus 400. A flow chart of the above-described manufacturing method is shown in Fig. 1, and a schematic view schematically showing the above-described manufacturing apparatus is shown in Figs. 5 and 6. Fig. Hereinafter, each step of the above-described manufacturing method will be described in detail.

In the resin preparation step (S1), the thermoplastic resin raw material in the form of a pellet initially introduced is improved and subjected to a process such as compression, heating, kneading, and the like. This process is performed by the extruder 100, and various types of equipment for extruding the polymer resin may be used for the extruder 100, but a screw extruder made of a thermally conductive material may be used .

A plurality of preprocessing processes such as metering, extrusion and kneading can be separately performed by controlling the rotation speed (rpm) of the screw or by adjusting the intervals of the grooves of the screw by applying a screw extruder. Finally, the mixer 300, The thickness of the thermoplastic resin to be coated can be controlled by adjusting the amount of the thermoplastic resin supplied to the thermoplastic resin.

Next, the carbon fiber preparation step S10 is performed by the carbon fiber supply unit 200, and a plurality of carbon fiber discharge units 210 are provided to discharge the continuous-phase carbon fibers 10 one by one through the carbon fiber discharge unit 210 The number of strands of the carbon fibers 10 supplied to the mixer 300 can be controlled by individually controlling the supply unit at this time so that the number of the carbon fibers 10 impregnated in the carbon fiber composite A The content ratio can be adjusted according to the product demand. The carbon fiber feeder 200 includes a twist 220 that spirally twists at least two continuous-phase carbon fibers 10 to form TW-fiber ends 20.

The shape of the TW-fiber ends 20 formed in the carbon fiber preparation step (S10) may be such that the continuous-phase carbon fibers 10 discharged one by one are crossed, zigzagged, twisted, twisted And may be formed by various methods such as twisting at least two or more continuous carbon fibers 10, etc. Thus, the carbon fibers (A) impregnated in the carbon fiber composite (A) 10 can be maximized to improve the content of long fibers.

Generally, when the carbon fiber composite (A) is manufactured and then circulated and used, the carbon fibers impregnated therein are cut to a length of 10 to 20% of the length of the originally impregnated carbon fiber. Therefore, when carbon fiber is simply impregnated in the longitudinal direction according to a general method, the carbon fiber having the same length as the length of the final composite pellet (about 6 to 7 mm) is impregnated and then used at a level of 0.6 to 0.7 mm It becomes a cut state.

Therefore, the present invention forms the TW-fiber end 20 by twisting a plurality of continuous-phase carbon fibers 10 in the carbon fiber preparation step (S10), thereby maximizing the length of the first carbon fiber to be impregnated, Thereby contributing to improvement of physical properties of the final composite pellet. Specifically, since the carbon fiber 10 having a length of about 40 mm is impregnated into the composite pellet finally produced in comparison with the prior art, the length is about 4 mm when it is used afterwards, so that the length of the inner carbon fiber is about 6 times .

Next, a coating step (S20) of coating a thermoplastic resin (30) on the outer circumferential surface of the TW-fiber end (20) supplied to the mixer (300) to form a carbon fiber composite (A) The carbon fiber composite material A coated with the carbon fiber composite material A is supplied to the air press molding device 400 and subjected to a molding step S50 for press molding the same. A preferred embodiment of the air-pressurized molding apparatus 400 used therefor is shown in Fig.

The air pressurized molding apparatus 400 is an apparatus for injecting high-pressure air to press-mold the outer circumferential surface of the carbon fiber composite material A to improve the adhesion between the carbon fiber 10 and the thermoplastic resin 30. The air press molding apparatus 400 according to an embodiment of the present invention includes an outer tube 410 filled with high pressure air and an inner tube 420 through which the carbon fiber composite A is passed, .

At this time, at least one hole 421 is formed in a predetermined region on the outer circumferential surface of the inner pipe 420 so that the carbon fiber composite A passing through the inner pipe 420 through the hole 421 is filled with air And is exposed on the pipe 410. Thereby, the portion on the outer circumferential surface of the exposed carbon fiber composite material (A) is pressed by the high-pressure air filled in the outer tube 410, and the press-molding process is continuously performed.

Next, a machining step (S40) for cooling and cutting the press-formed carbon fiber composite (A) as described above is performed. This is accomplished by using a post-processing unit 500 comprising a cooling unit 510. The carbon fiber composite (A) to be produced is allowed to pass through the cooling water continuously, thereby improving the stability, adhesion and strength of the molded composite.

Also, the carbon fiber composite material (A) is continuously drawn by placing a roller portion (520) having a plurality of rollers disposed at the end of the process, thereby allowing the carbon fiber composite material (A) to move in one direction, And can be continuously driven.

Finally, the post-treated carbon fiber composite material (A) as described above is cut through the cutter 600 to a length suitable for the product demand, thereby producing the carbon fiber composite material (A) in the form of the final product. A perspective view of the carbon fiber composite (A) to be produced is shown in Fig.

The ratio of the content of the carbon fibers 10 in the final product, that is, the carbon fiber composite material (A), more specifically, the ratio of the weight of the carbon fiber material 10 to the total weight of the carbon fiber composite material (A) Can be produced by adopting an appropriate content ratio, but it may preferably be 5 to 20% by weight. When the content of the carbon fiber (20) in the carbon fiber composite (A) is less than 5% by weight, the effect of improving the mechanical strength due to carbon fiber impregnation is not sufficiently obtained. When the content ratio exceeds 20% by weight, It is uneconomical in terms of improvement in function.

On the other hand, the carbon fiber composite (A), which is a final product, can produce an appropriate standard product by adjusting the cross-sectional diameter (D) and the cut length (L) 2 to 4 mm, and the cut length L may be 3 to 6 mm. If the cross-sectional area S is less than the above-mentioned cross-sectional diameter D, the content of the carbon fiber can not be sufficiently secured because the cross-sectional area S of the product is too small. In addition, when the length is less than the above-mentioned cut length (L), there is a problem that long fibers can not be contained as much as the produced composite length.

Hereinafter, an embodiment of a method and a device for twisting continuous carbon fibers to form a TW fiber end will be described. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. shall.

≪ Method of winding outer peripheral surface of center fiber end &

Embodiment 1 is an embodiment of a method of forming a central fiber end 20a by using a part of continuous carbon fibers 10 and spirally winding another continuous carbon fiber 10 on the outer peripheral surface thereof.

2 is a surface of a spiral twisted TW fiber 20 according to a first embodiment of the present invention, which includes a central fiber end 20a formed of at least one continuous phase carbon fiber 10, Is a TW-fiber end 20 made by spirally winding a continuous-phase carbon fiber 10 along the outer circumferential surface of the carbon fiber 10.

Hereinafter, a preferred embodiment of an apparatus for performing the method according to the present embodiment will be described.

5, a central fiber end 20a made of continuous-phase carbon fibers 10 discharged one by one in the carbon fiber discharge unit 210 and a strand of carbon fibers 10 spirally wound The carbon fibers 10 forming the center fiber end 20a in the twisted portion 220 are arranged to form an aligned axis and are wound helically along the outer peripheral surface of the center fiber end 20a The continuous carbon fibers 10 are stitched one by one on the arm portions of the rotating bodies. At this time, the continuous body carbon fibers 10 are spirally wound around the central fiber end 20a in a helical shape while rotating the rotating body by 360 °.

≪ Method of biting the entire carbon fiber bundle >

Example 2 is an embodiment of a method of spirally twisting two or more bundles of two or more continuous-phase carbon fibers 10 to form TW-fiber ends 20.

3 is a surface of a TW-fiber end 20 formed by spirally twisting the entire carbon fiber bundle according to a second embodiment of the present invention, (20).

Hereinafter, a preferred embodiment of an apparatus for performing the method according to the present embodiment will be described.

Referring to FIG. 6, when the number of continuous carbon fibers 10 discharged one by one in the carbon fiber discharging unit 210 is controlled and discharged, twisted portions 220 form two or more continuous carbon fibers 10) Using a motor that rotates and twists the entire bundle, the entire bundle of carbon fibers 10 is twisted in a spiral shape.

The carbon fiber composite having the TW fiber end of the present invention coated with a thermoplastic resin as described above and an apparatus for producing the carbon fiber composite have a function of imparting an electromagnetic wave shielding function by impregnating a carbon fiber having electrical conductivity into the thermoplastic resin, It has improved strength by about 30% compared to glass fiber and has adopted coating method by easy extrusion and injection molding, which improves workability and is recyclable. It is more environment-friendly than the basic products, It is possible to twist two or more continuous carbon fibers discharged by controlling the number of carbon fiber strands to easily adjust the content ratio of the carbon fibers impregnated in the composite to meet the requirements of the product, And the strength of the carbon fiber reinforced thermosetting resin is improved so much that the adhesion force between the carbon fiber and the thermoplastic resin The effect is further improved.

The present invention is not limited to the above-described specific embodiment and description, and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention as claimed in the claims. And such modifications are within the scope of protection of the present invention.

A: Carbon fiber composite
D: Cross-sectional diameter of the carbon fiber composite
L: Cut length of carbon fiber composite
10: carbon fiber
20: TW-fiber end
20a: central fiber end
30: Thermoplastic resin
100: extruder
200: carbon fiber supply part
210: Carbon fiber discharge part
220: Twisted part
300: Mixer
400: Air pressurized molding device
410: outer tube
420: internal pipe
421: hole
500: Post-
510:
520: roller portion
600: Cutting machine

Claims (15)

A carbon fiber preparation step (S10) of twisting at least two continuous carbon fibers (10) individually discharged one by one to form a TW-twisted carbon fiber (20);
Coating a thermoplastic resin (30) on the outer circumferential surface of the TW-fiber end (20) to form a carbon fiber composite (A);
Molding step (S30) of press-molding the outer circumferential surface of the carbon fiber composite (A) with high-pressure air to improve adhesion between the TW-fiber end (20) and the thermoplastic resin (30); And
A processing step (S40) of cooling and cutting the press-molded carbon fiber composite (A);
Wherein the TW-fiber end is coated with a thermoplastic resin.
The method according to claim 1,
In the carbon fiber preparation step (S10), the TW-fiber end 20 includes at least one continuous carbon fiber 10a along the outer peripheral surface of the central fiber end 20a formed of at least one continuous- 10) is wound in a spiral manner. The method for producing a carbon fiber composite according to claim 1, wherein the TW fiber is coated with a thermoplastic resin.
The method according to claim 1,
In the carbon fiber preparation step (S10)
Characterized in that the TW-fiber end (20) is formed in such a way that the entire bundle of at least two continuous-phase carbon fibers (10) is helically twisted. .
The method according to claim 1,
Prior to the coating step (S20)
A resin preparation step (S1) of weighing the inputted thermoplastic resin pellets, followed by compression and kneading to prepare the thermoplastic resin (30);
Wherein the TW fiber end is further coated with a thermoplastic resin.
5. The method of claim 4,
The resin preparation step (S1)
The thermoplastic resin pellets are injected into a screw type extruder 100 made of a thermally conductive material to control the rotation speed of the screw or to control the amount of the thermoplastic resin 30 prepared by adjusting the groove interval of the screw Wherein the TW fiber end is coated with a thermoplastic resin.
The method according to claim 1,
In the coating step S20,
Wherein the content of the TW-fiber end (20) in the carbon fiber composite (A) is controlled to be 5 to 20 wt% based on the total weight of the carbon fiber composite (A) Wherein the thermoplastic resin is coated on the carbon fiber composite.
A carbon fiber composite in which a TW fiber end prepared by the method of any one of claims 1 to 6 is coated with a thermoplastic resin.
8. The method of claim 7,
Wherein the carbon fiber composite (A) has a cross-sectional diameter (D) of 2 to 4 mm and a cut length (L) of 3 to 6 mm, wherein the TW fiber end is coated with a thermoplastic resin.
An extruder (100) for weighing the supplied thermoplastic resin pellets, followed by compression and kneading to supply the thermoplastic resin (30);
A carbon fiber supply 200 for twisting two or more continuous-phase carbon fibers 10 individually discharged one by one to form a TW-fiber end 20;
A mixer for forming the carbon fiber composite material A by coating the thermoplastic resin 30 supplied from the extruder 100 on the outer circumferential surface of the TW fiber end 20 supplied from the carbon fiber supply part 200 300); And
An air press molding device 400 for press-molding the carbon fiber composite material (A) through high-pressure air;
/ RTI >
The air pressurized molding apparatus 400 comprises an outer tube 410 for filling high pressure air and an inner tube 420 for passing the carbon fiber composite A,
At least one hole 421 is formed in a predetermined region on the outer circumferential surface of the inner tube 420 so as to communicate with the outer tube 410. The carbon fiber composite material is exposed to the outer tube 410 through the hole 421, Wherein the outer circumferential surface of the outer tube (A) is pressurized by the high-pressure air filled in the outer tube (410), wherein the TW fiber end is coated with the thermoplastic resin.
10. The method of claim 9,
The carbon fiber supply unit 200 may include:
A carbon fiber discharging portion 210 for individually discharging the continuous carbon fibers 10 one by one; And
A twisted portion 220 spirally twisting at least two continuous carbon fibers 10 to form TW-fiber ends 20;
Wherein the TW-fiber end is coated with a thermoplastic resin.
11. The method of claim 10,
The twisted portion 220 may be formed of,
The continuous carbon fibers 10 discharged from the carbon fiber discharging part 210 are discharged from the carbon fiber discharging part 210 by discharging the continuous carbon fibers 10 one by one while revolving while being connected to the outer peripheral surface of the carbon fiber discharging part 210 And the outer circumferential surface is spirally wound with the center fiber end (20a), wherein the TW fiber end is coated with a thermoplastic resin.
11. The method of claim 10,
The twisted portion 220 may be formed of,
Wherein at least two continuous carbon fibers (10) discharged from the carbon fiber discharging unit (210) are spirally twisted and twisted, whereby the TW fiber end is coated with a thermoplastic resin.
10. The method of claim 9,
A post-treatment unit (500) for cooling the press-molded carbon fiber composite (A); And
A cutting device 600 for cutting the carbon fiber composite material A to a predetermined length;
Wherein the TW fiber end is further coated with a thermoplastic resin.
10. The method of claim 9,
The extruder (100) is a screw extruder made of a thermally conductive material, and controls the amount of the thermoplastic resin (30) prepared by controlling the rotational speed of the screw or adjusting the groove interval of the screw. Wherein the thermoplastic resin is coated on the carbon fiber composite material.
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