Regeneration method of carbon fiber bundle and regenerator of carbon fiber bundle

Abstract

To provide a regeneration method of a carbon fiber bundle and a regenerator of a carbon fiber bundle, capable of dividing and regenerating a plurality of carbon fiber bundles included in a carbon fiber bundle aggregate evenly into an original number, even if the carbon fiber bundle aggregate including the plurality of carbon fiber bundles is wound around a hollow material.SOLUTION: A regeneration method of a carbon fiber bundle includes: a first heating step of heating a high-pressure hydrogen tank to decompose part of a matrix resin; a rolling-out step of rolling out an intermediate carbon fiber bundle aggregate I1 with a decomposition residue of the matrix resin adhered thereto from a carbon fiber-reinforced resin layer in which the part of the matrix resin is decomposed; a dividing step of dividing the intermediate carbon fiber bundle aggregate I1 thus rolled out into the plurality of intermediate carbon fiber bundles I2 with a decomposition residue of the matrix resin adhered thereon; a second heating step of heating the divided plurality of intermediate carbon fiber bundles I2 and decomposing the decomposition residue of the matrix resin to obtain a plurality of regenerated carbon fiber bundles; and a winding-up step of winding up the plurality of regenerated carbon fiber bundles.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a method for recycling carbon fiber bundles, a device for recycling carbon fiber bundles, and carbon fiber bundles.

Background Art

[0002] In recent years, efforts to significantly reduce the generation of waste have been actively carried out through waste prevention, reduction, recycling, and reuse. Toward this realization, research and development have been conducted on methods for recovering carbon fibers from carbon fiber-reinforced resins.

[0003] Patent Document 1 describes a method for recycling carbon fibers, which includes a step of thermally decomposing the resin in a carbon fiber-reinforced resin molded article by a first heat treatment, and a step of pulling out and winding up the carbon fibers from the carbon fiber-reinforced resin molded article after the first heat treatment. At this time, the winding-up step includes a step of thermally decomposing the resin residue adhering to the carbon fibers by a second heat treatment, and a step of applying a sizing agent to the carbon fibers after the second heat treatment. Further, the carbon fiber-reinforced resin molded article is a tank including a liner and a carbon fiber-reinforced resin layer.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when a carbon fiber bundle aggregate composed of a plurality of carbon fiber bundles is wound around a liner and the carbon fiber recycling method of Patent Document 1 is applied, when the resin residue adhering to the carbon fibers is thermally decomposed by a second heat treatment, the carbon fibers constituting the adjacent carbon fiber bundles are entangled. For this reason, the plurality of carbon fiber bundles constituting the carbon fiber bundle aggregate cannot be evenly divided into the original number and recycled.

[0006] An object of the present invention is to provide a method for regenerating carbon fiber bundles and a device for regenerating carbon fiber bundles, which can evenly divide and regenerate a plurality of carbon fiber bundles constituting a carbon fiber bundle assembly into the original number even when the carbon fiber bundle assembly composed of a plurality of carbon fiber bundles is wound around a hollow base material.

Means for Solving the Problems

[0007] (1) A method for regenerating carbon fiber bundles from a structure having a hollow base material and a carbon fiber reinforced resin layer including a carbon fiber bundle assembly composed of a plurality of carbon fiber bundles and wound around the hollow base material and a matrix resin, the method comprising: a first heating step of heating the structure to decompose a part of the matrix resin; a winding-out step of winding out an intermediate carbon fiber bundle assembly having the decomposition residue of the matrix resin adhering thereto from the carbon fiber reinforced resin layer in which a part of the matrix resin has been decomposed; a dividing step of dividing the wound-out intermediate carbon fiber bundle assembly into a plurality of intermediate carbon fiber bundles having the decomposition residue of the matrix resin adhering thereto; a second heating step of heating the plurality of divided intermediate carbon fiber bundles to decompose the decomposition residue of the matrix resin to obtain a plurality of regenerated carbon fiber bundles; and a winding-up step of winding up the plurality of regenerated carbon fiber bundles.

[0008] (2) The method for regenerating carbon fiber bundles according to (1), wherein in the dividing step, the plurality of intermediate carbon fiber bundles are supported by a plurality of tensioners.

[0009] (3) The method for regenerating carbon fiber bundles according to (2), wherein the tensioner includes two leaf springs that sandwich the intermediate carbon fiber bundle.

[0010] (4) The method for regenerating carbon fiber bundles according to (2) or (3), wherein the plurality of tensioners are arranged at a predetermined distance.

[0011] (5) The carbon fiber bundle assembly has a plurality of carbon fiber bundles arranged in parallel in the width direction, and the end portions in the width direction of the carbon fiber bundles arranged in parallel overlap alternately, and the plurality of tensioners are arranged so that the overlapping end portions of the carbon fiber bundles are separated. The method for regenerating carbon fiber bundles according to (4).

[0012] (6) After temporarily placing the unwound intermediate carbon fiber bundle assembly, dividing it into the plurality of intermediate carbon fiber bundles. The method for regenerating carbon fiber bundles according to any one of (1) to (5).

[0013] (7) An apparatus for regenerating carbon fiber bundles from a structure having a hollow substrate and a carbon fiber reinforced resin layer including a carbon fiber bundle assembly wound around the hollow substrate and a matrix resin, the apparatus including: a first heating unit that heats the structure to decompose a part of the matrix resin; a winding-out unit that winds out an intermediate carbon fiber bundle assembly having decomposition residues of the matrix resin adhering thereto from the carbon fiber reinforced resin layer in which a part of the matrix resin has been decomposed; a dividing unit that divides the wound-out intermediate carbon fiber bundle assembly into a plurality of intermediate carbon fiber bundles having decomposition residues of the matrix resin adhering thereto; a second heating unit that heats the plurality of divided intermediate carbon fiber bundles to decompose the decomposition residues of the matrix resin to obtain a plurality of regenerated carbon fiber bundles; and a winding unit that winds up the plurality of regenerated carbon fiber bundles. An apparatus for regenerating carbon fiber bundles.

[0014] (8) A regenerated carbon fiber bundle regenerated by the method for regenerating carbon fiber bundles according to any one of (1) to (6).

Advantages of the Invention

[0015] According to the present invention, even when a carbon fiber bundle assembly composed of a plurality of carbon fiber bundles is wound around a hollow substrate, it is possible to provide a method for regenerating carbon fiber bundles and an apparatus for regenerating carbon fiber bundles capable of evenly dividing and regenerating the plurality of carbon fiber bundles constituting the carbon fiber bundle assembly into the original number.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0018] A method for regenerating carbon fiber bundles according to an embodiment of the present invention is a method for regenerating carbon fiber bundles from a structure including a hollow base material, a carbon fiber bundle aggregate composed of a plurality of carbon fiber bundles, and a carbon fiber reinforced resin layer including a matrix resin wound around the hollow base material. The structure is not particularly limited, and examples thereof include known high-pressure hydrogen tanks (types 2 to 4).

[0019] The carbon fibers constituting the carbon fiber bundle are not particularly limited, and examples thereof include polyacrylonitrile (PAN)-based carbon fibers and pitch-based carbon fibers. Here, the carbon fibers constituting the carbon fiber bundle are long fibers. The fiber length of the carbon fibers is not particularly limited, but is, for example, 1 m or more. The matrix resin is not particularly limited, and examples thereof include thermosetting resins such as epoxy resins and thermoplastic resins.

[0020] Fig. 1 shows an example of a high-pressure hydrogen tank.

[0021] The high-pressure hydrogen tank T includes a liner L as a hollow substrate, a carbon fiber reinforced resin layer F including a carbon fiber bundle aggregate wound around the liner L and a matrix resin, and caps C1 and C2 installed at both ends in the length direction. The material constituting the liner L is not particularly limited, and examples thereof include metals such as aluminum and chrome molybdenum steel, and resins such as polyamide and polyethylene.

[0022] The manufacturing method of the high-pressure hydrogen tank T is not particularly limited, and examples thereof include a filament winding method.

[0023] Fig. 2 shows an example of a carbon fiber bundle aggregate.

[0024] In the carbon fiber bundle aggregate A, a plurality of carbon fiber bundles B are arranged in parallel in the width direction. At this time, the end portions in the width direction of the carbon fiber bundles B arranged in parallel overlap alternately.

[0025] A method for regenerating a carbon fiber bundle according to an embodiment of the present invention includes a first heating step of heating a high-pressure hydrogen tank T to decompose a part of the matrix resin, a winding-out step of winding out an intermediate carbon fiber bundle aggregate I1 having decomposition residues of the matrix resin attached thereto from a carbon fiber reinforced resin layer in which a part of the matrix resin has been decomposed, and a dividing step of dividing the wound-out intermediate carbon fiber bundle aggregate I1 into a plurality of intermediate carbon fiber bundles I2 having decomposition residues of the matrix resin attached thereto. Further, a method for regenerating a carbon fiber bundle according to an embodiment of the present invention further includes a second heating step of heating the plurality of divided intermediate carbon fiber bundles I2 to decompose the decomposition residues of the matrix resin to obtain a plurality of regenerated carbon fiber bundles R, and a winding-up step of winding up the plurality of regenerated carbon fiber bundles R. Therefore, the carbon fibers constituting the overlapping carbon fiber bundles of the intermediate carbon fiber bundle aggregate I1 are not entangled, and as a result, the plurality of carbon fiber bundles B constituting the carbon fiber bundle aggregate A are evenly divided into the original number and regenerated. In addition, since the heating of the plurality of divided intermediate carbon fiber bundles I2 is promoted, the processing time of the second heating step is shortened.

[0026] The first heating step preferably includes a first step of decomposing the matrix resin at a temperature equal to or higher than the thermal decomposition start temperature of the matrix resin and equal to or lower than the flash point of the thermal decomposition gas of the matrix resin, and a second step of decomposing the matrix resin decomposed in the first step at a temperature equal to or higher than the thermal oxidative decomposition start temperature of the decomposition residue of the matrix resin and equal to or lower than the thermal decomposition start temperature of the carbon fiber. Thereby, overheating due to combustion of the thermal decomposition gas of the matrix resin and deterioration of the carbon fiber are suppressed.

[0027] When the matrix resin is an epoxy resin, for example, in the first step, heating is performed at a temperature of 330°C or higher and 360°C or lower, and in the second step, heating is performed at a temperature of 430°C or higher and 470°C or lower. In this case, examples of the thermal decomposition gas include bisphenol A and phenol.

[0028] Note that the heating temperature in the first heating step is not particularly limited as long as it is possible to wind out the carbon fiber bundle to which the decomposition residue of the matrix resin is attached to the carbon fiber.

[0029] Fig. 3 shows a heat treatment furnace as an example of the first heating unit used in the first heating step.

[0030] The heat treatment furnace 10 has a heat treatment chamber 11 and a combustion chamber 12.

[0031] The heat treatment chamber 11 is a sealed space surrounded by an outer wall 11a and an inner wall 11b. Also, in the heat treatment chamber 11, burners 11c are provided at the upper part of the left outer wall 11a and the lower part of the right outer wall 11a in the drawing so that combustion gas flows into the inner wall 11b. For this reason, when gas fuel and air are mixed and burned by the burners 11c, the combustion gas convects inside the inner wall 11b and the temperature inside the inner wall 11b becomes stable.

[0032] The heat treatment chamber 11 is provided with a sealing door for accommodating the high-pressure hydrogen tank T at a part of the outer wall 11a and the inner wall 11b. Here, the high-pressure hydrogen tank T is placed on the heat insulating material 11d installed so as to penetrate the bottom surface of the inner wall 11b. Also, a load cell 11e as a mass detection unit is installed between the bottom surface of the outer wall 11a and the heat insulating material 11d, and the mass of the high-pressure hydrogen tank T is detected in real time based on the amount of strain. As a result, since the heating conditions in the heat treatment chamber 11 are optimized, fluctuations in the decomposition amount of the matrix resin due to individual differences in the material, shape, etc. of the high-pressure hydrogen tank T are suppressed, and the management accuracy is improved. Also, since the heating time in the heat treatment chamber 11 does not need to be made longer than necessary, it contributes to shortening the heating time and reducing the energy consumption.

[0033] Note that the mass detection unit may detect the amount of decrease in the mass of the high-pressure hydrogen tank T in real time. Also, if necessary, the mass detection unit may be omitted.

[0034] The decomposition gas of the matrix resin generated inside the inner wall 11b is discharged from the exhaust port 11f formed at the upper part of the inner wall 11b in the drawing, and then introduced into the combustion chamber 12 via the pipe 11g installed through the outer wall 11a.

[0035] The combustion chamber 12 is a sealed space surrounded by an outer wall 12a and an inner wall 12b. Also, in the combustion chamber 12, a burner 12c is provided at the central part of the outer wall 12a on the left side in the figure so that combustion gas flows into the inner wall 12b. On the other hand, after passing through the outer wall 12a, the pipe 11g penetrates both the inside and outside of the inner wall 12b within the outer wall 12a and is finally connected to the upper left part of the inner wall 12b in the figure. At this time, while the decomposition gas of the matrix resin passes through the pipe 11g inside the inner wall 12b, it is heated by the combustion gas flowing inside the inner wall 12b, then introduced from the upper left part of the inner wall 12b, and comes into contact with the combustion gas. As a result, after the decomposition gas of the matrix resin burns, it is exhausted to the outside through the exhaust port 12d.

[0036] Fig. 4 shows an example of a rotating part for rotating the high-pressure hydrogen tank T in the heat treatment chamber 11. Note that Figs. 4(a) and (b) are a cross-sectional view and a side view, respectively.

[0037] Since the rotating part 20 penetrates the wall part W of the heat treatment chamber 11 with a substantially horizontal rotation axis 21, the temperature distribution of the carbon fiber reinforced resin layer F in the vertical direction in the figure is equalized.

[0038] Note that the rotation axis 21 may be in a direction other than the substantially horizontal direction, for example, the substantially vertical direction. When the rotation axis 21 is in the substantially vertical direction, the temperature distribution of the carbon fiber reinforced resin layer F in the heat treatment chamber 11 is equalized to an extent similar to the case where the rotation axis 21 is in the substantially horizontal direction.

[0039] The high-pressure hydrogen tank T is connected to the rotation axis 21 via a flanged jig 22 and a rotation axis flange 23 that utilize the shapes of the bases C1 and C2. At this time, the flanged jig 22 and the rotation axis flange 23 are fixed with, for example, bolts and nuts. Also, the high-pressure hydrogen tank T is placed on a pedestal 24, and a bearing 25 is installed on the pedestal 24. Further, a heat insulating material 26 is installed inside the wall part W of the heat treatment furnace 10. Also, a motor for rotating the rotation axis 21 is installed outside the wall part W of the heat treatment furnace 10, and a cooling jacket 27 is installed around the rotation axis 21.

[0040] FIG. 5 shows an example of a pay-out unit used in the pay-out process. FIG. 6 shows an example of a pay-out unit and a splitting unit used in the pay-out process and the splitting process.

[0041] The pay-out unit 30 includes a rotary jig 31 that rotatably supports a high-pressure hydrogen tank T1 in which a part of the matrix resin has decomposed, and a motor 32 that rotates the high-pressure hydrogen tank T1. The rotational power of the motor 32 is transmitted to the rotary jig 31 via a belt 33. As a result, the intermediate carbon fiber bundle aggregate I1 is payed out via rollers 34 and 35. At this time, the roller 34 is arranged so that the intermediate carbon fiber bundle aggregate I1 is payed out outside the tangent line at the position where the intermediate carbon fiber bundle aggregate I1 of the high-pressure hydrogen tank T1 is payed out. Further, the rollers 34 and 35 have a major axis so as to correspond to the pay-out of the intermediate carbon fiber bundle aggregate I1 in the longitudinal direction of the high-pressure hydrogen tank T1. Furthermore, a dancer roller 36 for controlling the pay-out tension is installed to absorb the difference in the pay-out amount per rotation due to the hoop winding and the helical winding of the intermediate carbon fiber bundle aggregate I1.

[0042] Note that a blade may be installed instead of the roller 34.

[0043] The splitting unit 100 splits the unwound intermediate carbon fiber bundle aggregate I1 into a plurality of intermediate carbon fiber bundles I2 to which decomposition residues of the matrix resin adhere, and includes a plurality of tensioners 101 that support the plurality of intermediate carbon fiber bundles I2, and a roller 102 that conveys the plurality of intermediate carbon fiber bundles I2. For this reason, in the winding process, in addition to making it difficult for the torque applied to the recycled carbon fiber bundle R to be conducted to the high-pressure hydrogen tank T1, the tension of the intermediate carbon fiber bundle I2 in the second heating process is adjusted. As shown in FIG. 7, the tensioner 101 is a spring tensioner including two leaf springs 111 that sandwich the intermediate carbon fiber bundle I2. Examples of commercially available spring tensioners include Spring Leaf Yarn Tensioner (manufactured by Ascotex). Here, as shown in FIG. 8, the plurality of tensioners 101 are arranged such that the overlapping ends of the carbon fiber bundles B constituting the unwound intermediate carbon fiber bundle aggregate I1 are separated. That is, in the figure, the tensioner 101 corresponding to the carbon fiber bundle B arranged on the upper side is arranged above the intermediate carbon fiber bundle aggregate I1, and the tensioner 101 corresponding to the carbon fiber bundle B arranged on the lower side in the figure is arranged below the intermediate carbon fiber bundle aggregate I1. For this reason, the unwound intermediate carbon fiber bundle aggregate I1 is split into a plurality of intermediate carbon fiber bundles I2.

[0044] Note that as long as the carbon fiber bundle aggregate is composed of a plurality of carbon fiber bundles, the plurality of carbon fiber bundles do not have to be arranged in parallel in the width direction. For example, in the carbon fiber bundle aggregate, the plurality of carbon fiber bundles may be laminated in the thickness direction. At this time, the tensioner is arranged according to the arrangement of the carbon fiber bundles constituting the carbon fiber bundle aggregate.

[0045] The splitting unit 100 may further have a buffer portion for temporarily placing the unwound intermediate carbon fiber bundle aggregate I1. Thereby, in the winding process, it becomes difficult for the torque applied to the recycled carbon fiber bundle R to be conducted to the high-pressure hydrogen tank T1.

[0046] FIG. 9 shows a modified example of the splitting unit 100.

[0047] The dividing part 100A has the same configuration as the dividing part 100, except that a plurality of tensioners 101 are arranged at a predetermined distance (for example, 10 cm).

[0048] The heating temperature in the second heating step is preferably equal to or higher than the heating temperature in the first heating step. Thereby, the decomposition residues of the matrix resin adhering to the intermediate carbon fiber bundle I2 are likely to decompose. On the other hand, the heating temperature in the second heating step is preferably equal to or lower than the thermal decomposition start temperature of the carbon fiber. Thereby, the deterioration of the carbon fiber is suppressed.

[0049] Note that after performing the sizing step of sizing the regenerated carbon fiber bundle R, the sized regenerated carbon fiber bundle R may be wound up.

[0050] FIG. 10 shows an example of the second heating unit, sizing unit, and winding unit used in the second heating step, sizing step, and winding step.

[0051] As the second heating unit, the tubular furnace 40 is provided with a heat insulation lid 42 having through holes at both ends of the quartz tube 41 through which the intermediate carbon fiber bundle I2 to which the decomposition residues of the matrix resin adhere can pass. Further, in the central portion of the quartz tube 41 of the tubular furnace 40, a heating wire 43, a heat insulating material 44, and a protective cover 45 are sequentially installed. Therefore, by passing an electric current through the heating wire 43, the intermediate carbon fiber bundle I2 is heated and the decomposition residues of the matrix resin are decomposed, so that the regenerated carbon fiber bundle R is obtained. At this time, in addition to the temperature distribution in the tubular furnace 40 being made uniform, heating other than the intermediate carbon fiber bundle I2 is suppressed.

[0052] The sizing unit 50 passes the regenerated carbon fiber bundle R through the sizing liquid 51. At this time, the sizing liquid 51 is heated by the heater 52. Further, the excessive coating of the sizing liquid 51 on the regenerated carbon fiber bundle R is prevented by the roller 53.

[0053] In addition, if necessary, a drying furnace may be installed to dry the regenerated carbon fiber bundle R.

[0054] The feeding mechanism 60 has feeder rollers 61, 62, and 63, and the linear velocity of the regenerated carbon fiber bundle R is controlled to a linear velocity that is easy to manage in the process by utilizing the friction between the feeder rollers 61, 62, and 63 and the regenerated carbon fiber bundle R.

[0055] The winding unit 70 includes a winding motor 71 for winding the regenerated carbon fiber bundle R around the paper core P, and a slide roller 72 for traversing winding the regenerated carbon fiber bundle R. At this time, by controlling the torque of the winding motor 71, the winding tension of the regenerated carbon fiber bundle R is controlled.

[0056] Note that the regenerated carbon fiber bundle R may be fibrillated, or a plurality of regenerated carbon fiber bundles R may be aligned. Also, among the plurality of regenerated carbon fiber bundles R, only the regenerated carbon fiber bundle R derived from the carbon fiber bundle B that is not disposed at both ends in the width direction of the carbon fiber bundle aggregate A may be wound as long fibers. In this case, the regenerated carbon fiber bundle R derived from the carbon fiber bundle B disposed at both ends in the width direction of the carbon fiber bundle aggregate A may be short fibers.

[0057] As described above, the embodiments of the present invention have been explained. However, the present invention is not limited to the above embodiments, and the above embodiments may be appropriately changed within the scope of the gist of the present invention. For example, as a structure other than the high-pressure hydrogen tank, a propeller shaft, a safety block, a low-friction roll, a rotor part of a spindle shaft motor, etc. may be used.

Explanation of Reference Numerals

[0058] 100, 100A Division part 101 Tensioner 111 Leaf spring A Carbon fiber bundle aggregate B Carbon fiber bundle C1, C2 Nozzle F Carbon fiber reinforced resin layer I1 Intermediate carbon fiber bundle aggregate Intermediate carbon fiber bundle of I2 L Liner Recycled carbon fiber bundle of R High-pressure hydrogen tanks of T and T1

Claims

1. A method for regenerating carbon fiber bundles from a structure having a hollow substrate, a carbon fiber bundle aggregate composed of a plurality of carbon fiber bundles, and a carbon fiber reinforced resin layer including the carbon fiber bundle aggregate and a matrix resin wound around the hollow substrate, comprising: a first heating step of heating the structure to decompose a part of the matrix resin; a unwinding step of unwinding the carbon fiber bundle aggregate having the decomposition residue of the matrix resin attached thereto from the carbon fiber reinforced resin layer in which a part of the matrix resin has been decomposed; a dividing step of dividing the unwound carbon fiber bundle aggregate into a plurality of intermediate carbon fiber bundles having the decomposition residue of the matrix resin attached thereto; a second heating step of heating the plurality of divided intermediate carbon fiber bundles to decompose the decomposition residue of the matrix resin to obtain a plurality of regenerated carbon fiber bundles; and a winding step of winding up the plurality of regenerated carbon fiber bundles. A method for regenerating carbon fiber bundles.

2. The method for regenerating carbon fiber bundles according to claim 1, wherein in the dividing step, the plurality of intermediate carbon fiber bundles are supported by a plurality of tensioners.

3. The method for regenerating carbon fiber bundles according to claim 2, wherein the tensioner includes two leaf springs that sandwich the intermediate carbon fiber bundle.

4. The method for regenerating carbon fiber bundles according to claim 2 or 3, wherein the plurality of tensioners are arranged at a predetermined distance apart.

5. In the carbon fiber bundle aggregate, a plurality of carbon fiber bundles are arranged in parallel in the width direction, and the end portions in the width direction of the carbon fiber bundles arranged in parallel overlap alternately. The method for regenerating carbon fiber bundles according to claim 4, wherein the plurality of tensioners are arranged such that the overlapping end portions of the carbon fiber bundles are separated.

6. The method for regenerating carbon fiber bundles according to any one of claims 1 to 3, wherein after temporarily placing the unwound intermediate carbon fiber bundle aggregate, it is divided into the plurality of intermediate carbon fiber bundles.

7. An apparatus for regenerating carbon fiber bundles from a structure having a hollow substrate, a carbon fiber bundle aggregate composed of a plurality of carbon fiber bundles, and a carbon fiber reinforced resin layer including the carbon fiber bundle aggregate and a matrix resin wound around the hollow substrate, comprising: a first heating unit that heats the structure to decompose a part of the matrix resin; An unwinding part for unwinding a carbon fiber bundle aggregate to which decomposition residues of the matrix resin adhere from a carbon fiber reinforced resin layer in which a part of the matrix resin has decomposed; A dividing part for dividing the unwound carbon fiber bundle aggregate into a plurality of intermediate carbon fiber bundles to which decomposition residues of the matrix resin adhere; A second heating part for heating the plurality of divided intermediate carbon fiber bundles to decompose the decomposition residues of the matrix resin, thereby obtaining a plurality of recycled carbon fiber bundles; A winding part for winding up the plurality of recycled carbon fiber bundles, and a carbon fiber bundle recycling device. [

8. ] A recycled carbon fiber bundle that has been recycled by the method for recycling a carbon fiber bundle according to any one of claims 1 to 3.

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