Carbon fiber bundle regeneration method and carbon fiber bundle regeneration device

Abstract

A method for regenerating a carbon fiber bundle from a structure having: a hollow base material; and a carbon fiber reinforced resin layer comprising a carbon fiber bundle wound around the hollow base material and a matrix resin, furthermore, the method for regenerating the carbon fiber bundle includes: a first heating step of heating the structure to decompose a portion of the matrix resin; an unwinding step in which the intermediate carbon fiber bundle to which the decomposition residue of the matrix resin has adhered is unwound from the carbon fiber-reinforced resin layer in which a part of the matrix resin has been decomposed; a second heating step for obtaining a regenerated carbon fiber bundle by heating the unwound intermediate carbon fiber bundle using a tubular furnace and decomposing the decomposition residue of the matrix resin; and a winding step for winding the regenerated carbon fiber bundle. The tubular furnace is provided with: a heater for heating the intermediate carbon fiber bundle; and a cover provided at the inlet and the outlet and having a through-hole through which the intermediate carbon fiber bundle can pass.

Description

Technical Field

[0001] The present invention relates to a method for regenerating a carbon fiber bundle and a device for regenerating a carbon fiber bundle. Background Art

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

[0003] Patent Document 1 describes a method for recycling carbon fibers, including the following steps: a step of thermally decomposing the resin in a carbon fiber reinforced resin molded product by a first heat treatment; and a step of pulling out and winding the carbon fibers from the carbon fiber reinforced resin molded product after the first heat treatment. At this time, the winding step includes: a step of thermally decomposing the resin residue attached 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. In addition, the carbon fiber reinforced resin molded product is a tank having a liner and a carbon fiber reinforced resin layer.

[0004] [Prior Art Documents]

[0005] (Patent Document)

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2022 - 15366 Summary of the Invention

[0007] [Problems to be Solved by the Invention]

[0008] However, if the carbon fiber recycling method of Patent Document 1 is used, when the resin residue attached to the carbon fibers is thermally decomposed by the second heat treatment, heat energy is released or external air is mixed in. Therefore, it is difficult to stably and efficiently thermally decompose the resin residue attached to the carbon fibers.

[0009] An object of the present invention is to provide a method for regenerating a carbon fiber bundle and a device for regenerating a carbon fiber bundle that can heat an intermediate carbon fiber bundle to stably and efficiently decompose the decomposition residue of the matrix resin.

[0010] [Technical Means for Solving the Problems]

[0011] (1) A method for regenerating a carbon fiber bundle, which is a method for regenerating a carbon fiber bundle from a structure. The structure has: a hollow substrate; and a carbon fiber reinforced resin layer including a carbon fiber bundle wound around the hollow substrate and a matrix resin. And the method for regenerating the carbon fiber bundle includes: a first heating step of heating the structure to decompose a part of the matrix resin; an unwinding step of unwinding an intermediate carbon fiber bundle with decomposition residues of the matrix resin attached from the carbon fiber reinforced resin layer after a part of the matrix resin is decomposed; a second heating step of heating the unwound intermediate carbon fiber bundle using a tubular furnace to decompose the decomposition residues of the matrix resin, thereby obtaining a regenerated carbon fiber bundle; and a winding step of winding the regenerated carbon fiber bundle. The tubular furnace has: a heater for heating the intermediate carbon fiber bundle; and a lid provided at an inlet and an outlet and formed with a through hole through which the intermediate carbon fiber bundle can pass.

[0012] (2) The method for regenerating a carbon fiber bundle according to (1), wherein in the tubular furnace, there is a heating region where the intermediate carbon fiber bundle is heated and a non-heating region where the intermediate carbon fiber bundle is not heated, and the non-heating region exists between the heating region and the inlet and / or between the heating region and the outlet.

[0013] (3) The method for regenerating a carbon fiber bundle according to (2), wherein the tubular furnace further has an inlet pipe for introducing an oxidizing gas into the heating region.

[0014] (4) The method for regenerating a carbon fiber bundle according to (3), wherein the oxidizing gas is introduced along the surface of the intermediate carbon fiber bundle.

[0015] (5) The method for regenerating a carbon fiber bundle according to (3) or (4), wherein the oxidizing gas is introduced from the downstream side to the upstream side of the tubular furnace.

[0016] (6) The method for regenerating a carbon fiber bundle according to any one of (3) to (5), wherein the inlet pipe is arranged such that the oxidizing gas introduced into the heating region forms a turbulent flow.

[0017] (7) The method for regenerating a carbon fiber bundle according to any one of (1) to (6), wherein the through hole is slit-shaped and formed in the horizontal direction.

[0018] (8) The method for regenerating a carbon fiber bundle according to any one of (1) to (7), wherein the lid is formed with a plurality of the through holes.

[0019] (9) A regeneration device for carbon fiber bundles is a device for regenerating carbon fiber bundles from a structure. The structure has: a hollow substrate; and, a carbon fiber reinforced resin layer containing carbon fiber bundles wound around the aforementioned hollow substrate and a matrix resin. And, the regeneration device for carbon fiber bundles has: a first heating unit that heats the aforementioned structure to decompose a part of the aforementioned matrix resin; an unwinding unit that unwinds an intermediate carbon fiber bundle with decomposition residues of the aforementioned matrix resin attached from the carbon fiber reinforced resin layer after a part of the aforementioned matrix resin is decomposed; a second heating unit that heats the unwound intermediate carbon fiber bundle to decompose the decomposition residues of the aforementioned matrix resin, thereby obtaining regenerated carbon fiber bundles; and, a winding unit that winds the aforementioned regenerated carbon fiber bundles. The aforementioned second heating unit is a tubular furnace, and the tubular furnace has: a heater that heats the aforementioned intermediate carbon fiber bundle; and, a lid that is provided at the inlet and outlet and has a through hole through which the aforementioned intermediate carbon fiber bundle can pass.

[0020] (Effects of the Invention)

[0021] According to the present invention, a regeneration method for carbon fiber bundles and a regeneration device for carbon fiber bundles that can heat an intermediate carbon fiber bundle to stably and efficiently decompose decomposition residues of a matrix resin can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view showing an example of a high-pressure hydrogen tank.

[0023] Figure 2 It is a view showing an example of the first heating unit used in the first heating process.

[0024] Figure 3 It is shown in Figure 2 a rotating part that rotates the high-pressure hydrogen tank in the heat treatment chamber.

[0025] Figure 4 It is a view showing an example of the unwinding unit used in the unwinding process.

[0026] Figure 5 It is a schematic view showing an example of the second heating unit, sizing unit, and winding unit used in the second heating process, sizing process, and winding process.

[0027] Figure 6 It is shown in Figure 5 a front view of a heat insulation lid.

[0028] Figure 7 It is shown in Figure 6 a front view of a modified example of the heat insulation lid.

[0029] Figure 8 It is Figure 5Partial enlarged cross-sectional view of a tubular furnace. Detailed implementation mode

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0031] A method for regenerating a carbon fiber bundle according to an embodiment of the present invention is a method for regenerating a carbon fiber bundle from a structure, the structure having: a hollow substrate; and a carbon fiber reinforced resin layer including a carbon fiber bundle wound around the hollow substrate and a matrix resin. The structure is not particularly limited, and for example, a known high-pressure hydrogen tank (type 2 to 4) can be cited.

[0032] The carbon fiber constituting the carbon fiber bundle is not particularly limited, and for example, polyacrylonitrile (PAN)-based carbon fiber, pitch-based carbon fiber can be cited. Here, the carbon fiber constituting the carbon fiber bundle is a long fiber. The fiber length of the carbon fiber is not particularly limited, for example, it is 1 m or more. The matrix resin is not particularly limited, and for example, thermosetting resins such as epoxy resin, thermoplastic resins can be cited.

[0033] Figure 1 An example of a high-pressure hydrogen tank is shown.

[0034] The high-pressure hydrogen tank T has a liner L as a hollow substrate, a carbon fiber reinforced resin layer F including a carbon fiber bundle wound around the liner L and a matrix resin, and interfaces C1, C2 provided at both ends in the length direction. The material constituting the liner L is not particularly limited, and for example, metals such as aluminum and chromium molybdenum steel, resins such as polyamide and polyethylene can be cited.

[0035] The manufacturing method of the high-pressure hydrogen tank T is not particularly limited, and for example, the filament winding method can be cited.

[0036] 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; and an unwinding step of unwinding an intermediate carbon fiber bundle I having decomposition residues of the matrix resin attached thereto from a carbon fiber reinforced resin layer after a part of the matrix resin is decomposed. In addition, the method for regenerating a carbon fiber bundle according to an embodiment of the present invention further includes: a second heating step of heating the unwound intermediate carbon fiber bundle I using a tubular furnace to decompose the decomposition residues of the matrix resin, thereby obtaining a regenerated carbon fiber bundle R; and a winding step of winding the regenerated carbon fiber bundle R. Here, the tubular furnace has: a heater for heating the intermediate carbon fiber bundle I; and a lid provided at the inlet and outlet and formed with a through-hole through which the intermediate carbon fiber bundle I can pass. Therefore, when using the tubular furnace to heat the intermediate carbon fiber bundle I to decompose the decomposition residues of the matrix resin, heat energy release and external air mixing can be suppressed. As a result, the decomposition residues of the matrix resin can be decomposed stably and efficiently.

[0037] The first heating step preferably includes: a first process of decomposing the matrix resin at a temperature equal to or higher than the thermal decomposition start temperature of the matrix resin and lower than the flash point of the thermal decomposition gas of the matrix resin; and a second process of decomposing the matrix resin decomposed in the first process at a temperature equal to or higher than the thermal oxidative decomposition start temperature of the decomposition residues of the matrix resin and lower than the thermal decomposition start temperature of the carbon fiber. Thereby, overheating caused by combustion of the thermal decomposition gas of the matrix resin and deterioration of the carbon fiber can be suppressed.

[0038] When the matrix resin is an epoxy resin, for example, in the first process, heating is performed at a temperature of 330°C or higher and 360°C or lower, and in the second process, heating is performed at a temperature of 430°C or higher and 470°C or lower. In this case, as the thermal decomposition gas, for example, bisphenol A, phenol, etc. can be cited.

[0039] In addition, regarding the heating temperature in the first heating step, there is no particular limitation as long as the carbon fiber bundle with the decomposition residues of the matrix resin attached to the carbon fiber can be unwound.

[0040] Figure 2 A heat treatment furnace is shown as an example of the first heating unit used in the first heating step.

[0041] The heat treatment furnace 10 has a heat treatment chamber 11 and a combustion chamber 12.

[0042] The heat treatment chamber 11 is an enclosed space surrounded by an outer wall 11a and an inner wall 11b. Additionally, in the figure, burners 11c are provided at the upper part of the left outer wall 11a and the lower part of the right outer wall 11a of the heat treatment chamber 11 in such a way that the combustion gas flows into the inner wall 11b. Therefore, when the gas fuel and air are mixed and burned using the burners 11c, the combustion gas convects within the inner wall 11b, thereby stabilizing the temperature within the inner wall 11b.

[0043] In the heat treatment chamber 11, a sealed door for accommodating the high-pressure hydrogen tank T is provided in a part of the outer wall 11a and the inner wall 11b. Here, the high-pressure hydrogen tank T is placed on a heat insulating material 11d, and the heat insulating material 11d is provided in such a way as to penetrate the bottom surface of the inner wall 11b. Additionally, a load sensor 11e serving as a mass detection unit is provided 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 strain. Thus, the heating conditions in the heat treatment chamber 11 are optimized. Therefore, variations in the decomposition amount of the matrix resin caused by individual differences in the materials, shapes, etc. of the high-pressure hydrogen tank T can be suppressed, thereby improving the management accuracy. Additionally, the heating time in the heat treatment chamber 11 does not need to be overly extended, so it helps to shorten the heating time and reduce the energy consumption.

[0044] In addition, the mass detection unit can also detect the reduction amount of the mass of the high-pressure hydrogen tank T in real time. Additionally, the mass detection unit can be omitted as needed.

[0045] In the figure, the decomposition gas of the matrix resin generated within the inner wall 11b is discharged from the exhaust port 11f formed at the upper part of the inner wall 11b, and then is introduced into the combustion chamber 12 through a pipe 11g provided through the outer wall 11a.

[0046] The combustion chamber 12 is an enclosed space surrounded by an outer wall 12a and an inner wall 12b. Additionally, in the figure, a burner 12c is provided at the central part of the left outer wall 12a of the combustion chamber 12 in such a way that the combustion gas flows into the inner wall 12b. On the other hand, after passing through the outer wall 12a, the pipe 11g passes through the inside and outside of the inner wall 12b within the outer wall 12a, and finally, in the figure, is connected to the upper left part of the inner wall 12b. At this time, the decomposition gas of the matrix resin is heated by the combustion gas flowing within the inner wall 12b during the period of passing through the pipe 11g within the inner wall 12b, and then is introduced from the upper left part of the inner wall 12b and comes into contact with the combustion gas. Thus, after the decomposition gas of the matrix resin burns, it is exhausted to the outside from the exhaust port 12d.

[0047] Figure 3 An example of a rotating part for rotating the high-pressure hydrogen tank T within the heat treatment chamber 11 is shown in the figure. Additionally, Figure 3 (a) and (b) are a cross-sectional view and a side view respectively.

[0048] The rotation axis 21 in the substantially horizontal direction of the rotating part 20 penetrates the wall part W of the heat treatment chamber 11. Therefore, in the figure, the temperature distribution of the carbon fiber reinforced resin layer F in the vertical direction is homogenized.

[0049] In addition, the rotation axis 21 may also be in a direction other than the substantially horizontal direction. For example, it may also be in the substantially vertical direction. If 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 will be homogenized to the same extent as when the rotation axis 21 is in the substantially horizontal direction.

[0050] 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 interfaces C1 and C2. At this time, the flanged jig 22 and the rotation axis flange 23 are fixed by bolts and nuts, for example. In addition, the high-pressure hydrogen tank T is placed on a base 24, and a bearing 25 is provided on the base 24. Further, a heat insulating material 26 is provided inside the wall part W of the heat treatment furnace 10. In addition, a motor for rotating the rotation axis 21 is provided outside the wall part W of the heat treatment furnace 10, and a cooling jacket 27 is provided around the rotation axis 21.

[0051] Figure 4 An example of the unwinding part used in the unwinding process is shown. In addition, Figure 4 (a) and (b) are a front view and a side view, respectively.

[0052] The unwinding part 30 has: a rotating jig 31 that supports the high-pressure hydrogen tank T1 after a part of the matrix resin is decomposed so as to be rotatable; and a motor 32 that rotates the high-pressure hydrogen tank T1. The rotational power of the motor 32 is transmitted to the rotating jig 31 via a belt 33. As a result, the intermediate carbon fiber bundle I is unwound via rollers 34, 35, and 36. At this time, the roller 34 is arranged such that the intermediate carbon fiber bundle I is unwound to the outside of the tangent line at the position of the unwound intermediate carbon fiber bundle I of the high-pressure hydrogen tank T1. In addition, the rollers 34, 35, and 36 are long shafts to cope with the unwinding of the intermediate carbon fiber bundle I in the longitudinal direction of the high-pressure hydrogen tank T1. Further, a dancer roller 37 for controlling the unwinding tension is provided to absorb the difference in the unwinding amount per turn caused by the circumferential winding and helical winding of the intermediate carbon fiber bundle I.

[0053] In addition, a blade may be provided instead of the roller 34.

[0054] 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 attached to the intermediate carbon fiber bundle I are easily decomposed. 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, deterioration of the carbon fiber can be suppressed.

[0055] In addition, after performing the sizing step of sizing the recycled carbon fiber bundle R, the sized recycled carbon fiber bundle R may be wound.

[0056] Figure 5 An example of the second heating unit, the sizing unit, and the winding unit used in the second heating step, the sizing step, and the winding step is shown.

[0057] As the tubular furnace 40 of the second heating unit, heat insulating covers 42 are provided at the inlet and the outlet, that is, at both ends of the quartz tube 41 (see Figure 6 ), and the heat insulating cover 42 is formed with a slit-shaped through hole S through which the intermediate carbon fiber bundle I to which the decomposition residues of the matrix resin are attached can pass. Here, the slit-shaped through hole S is formed in the horizontal direction. In addition, in the tubular furnace 40, a heating wire heater 43, a heat insulating material 44, and a protective cover 45 are sequentially provided at the central portion of the quartz tube 41. Therefore, the heating wire heater 43 heats the intermediate carbon fiber bundle I, thereby decomposing the decomposition residues of the matrix resin, and thus a recycled carbon fiber bundle R can be obtained.

[0058] In addition, when heating a plurality of intermediate carbon fiber bundles I, a heat insulating cover 42A formed with a plurality of slit-shaped through holes S can be used (see Figure 7 ). In addition, regarding the shape of the through hole formed in the heat insulating cover, as long as the intermediate carbon fiber bundle I can pass through, it is not limited to the slit shape.

[0059] In the tubular furnace 40, as Figure 8 shown, there are a heating region H where the intermediate carbon fiber bundle I is heated and a non-heating region N where the intermediate carbon fiber bundle I is not heated. That is, the heating wire heater 43 is wound around the quartz tube 41 constituting the heating region H, and the heating wire heater 43 is not wound around the quartz tube 41 constituting the non-heating region N. Here, the non-heating region N exists between the end portion on the inlet side of the quartz tube 41 and the heating region H, and between the end portion on the outlet side of the quartz tube 41 and the heating region H. Therefore, due to the temperature difference between the heating region H and the non-heating region N, natural convection vortices are generated, and as a result, the atmosphere gas in the heating region H stays.

[0060] In the tubular furnace 40, an introduction pipe 46 is provided, and the introduction pipe 46 introduces an oxidizing gas into the heating zone H. At this time, by introducing the minimum amount of oxidizing gas, the carbon dioxide contained in the atmosphere gas in the staying heating zone H is discharged, so that the composition and temperature of the atmosphere gas in the heating zone H can be maintained. In addition, the oxidizing gas is introduced along the surface of the intermediate carbon fiber bundle I. Therefore, the fuzzing of the regenerated carbon fiber bundle R can be suppressed. Further, the oxidizing gas is introduced from the downstream side to the upstream side of the tubular furnace 40. Therefore, the decomposition residues of the trace matrix resin attached to the intermediate carbon fiber bundle I on the downstream side of the tubular furnace 40 are easily decomposed. In addition, the introduction pipe 46 is arranged along the upper surface of the quartz tube 41. Therefore, the oxidizing gas introduced into the heating zone H forms a turbulent flow. At this time, in order to make the oxidizing gas introduced into the heating zone H form a turbulent flow, the temperature of the oxidizing gas can also be normal temperature, or the oxidizing gas can be introduced intermittently.

[0061] As the oxidizing gas, as long as it is a gas that promotes the oxidation of the decomposition residues of the matrix resin attached to the intermediate carbon fiber bundle I, there is no particular limitation, and for example, oxygen can be cited.

[0062] In addition, the heating zone H can also be divided into multiple zones. In addition, the introduction pipe 46 may not be arranged along the upper surface of the quartz tube 41.

[0063] The sizing part 50 makes the regenerated carbon fiber bundle R pass through the sizing liquid 51. At this time, the sizing liquid 51 is heated by the heater 52. In addition, the overcoating of the sizing liquid 51 on the regenerated carbon fiber bundle R can be prevented by the roller 53.

[0064] In addition, a drying furnace can be provided as needed to dry the regenerated carbon fiber bundle R.

[0065] The feeding mechanism 60 includes feeding rollers 61, 62 and 63, and the linear speed of the regenerated carbon fiber bundle R is controlled to a linear speed that is easy to manage the process by the friction between the feeding rollers 61, 62 and 63 and the regenerated carbon fiber bundle R.

[0066] The winding part 70 includes: a winding motor 71 for winding the regenerated carbon fiber bundle R around the paper core P; and a sliding roller 72 for laterally 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 can be controlled.

[0067] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and the above embodiments can 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 transmission shaft, a safety stop, a low-friction roller, a rotor part of a main shaft motor, etc. can also be used.

[0068] Reference Numerals

[0069] 40 Tubular Furnace

[0070] 42, 42A Heat Insulating Covers

[0071] 43 Electric Heating Wire Heater

[0072] 46 Inlet Pipe

[0073] C1, C2 Interfaces

[0074] F Carbon Fiber Reinforced Resin Layer

[0075] H Heating Region

[0076] I Intermediate Carbon Fiber Bundle

[0077] L Inner Lining

[0078] N Non-Heating Region

[0079] R Regenerated Carbon Fiber Bundle

[0080] S Slit-Shaped Through-Hole

[0081] T, T1 High-Pressure Hydrogen Tanks

Claims

1. A method for regenerating a carbon fiber bundle, which is a method for regenerating a carbon fiber bundle from a structure, the structure having: a hollow substrate; And, a carbon fiber reinforced resin layer, comprising carbon fiber bundles wound around the aforementioned hollow substrate and a matrix resin; And, The method for regenerating the carbon fiber bundles includes: A first heating step of heating the aforementioned structure to decompose a part of the aforementioned matrix resin; An unwinding step of unwinding the intermediate carbon fiber bundles with the decomposition residues of the aforementioned matrix resin attached from the carbon fiber reinforced resin layer after a part of the aforementioned matrix resin is decomposed; A second heating step of heating the aforementioned unwound intermediate carbon fiber bundles using a tubular furnace to decompose the decomposition residues of the aforementioned matrix resin, thereby obtaining regenerated carbon fiber bundles; and, A winding step of winding the aforementioned regenerated carbon fiber bundles; The aforementioned tubular furnace has: a heater for heating the aforementioned intermediate carbon fiber bundles; and a lid provided at the inlet and outlet and formed with a through-hole through which the aforementioned intermediate carbon fiber bundles can pass.

2. The regeneration method of the carbon fiber bundle according to claim 1, wherein, In the aforementioned tubular furnace, there are a heating region where the aforementioned intermediate carbon fiber bundles are heated and a non-heating region where the aforementioned intermediate carbon fiber bundles are not heated, The aforementioned non-heating region exists between the aforementioned heating region and the aforementioned inlet and / or between the aforementioned heating region and the aforementioned outlet.

3. The regeneration method of the carbon fiber bundle according to claim 2, wherein, The aforementioned tubular furnace further has an inlet pipe for introducing an oxidizing gas into the aforementioned heating region.

4. The regeneration method of the carbon fiber bundle according to claim 3, wherein, The aforementioned oxidizing gas is introduced along the surface of the aforementioned intermediate carbon fiber bundles.

5. The method for regenerating a carbon fiber bundle according to claim 3 or 4, wherein, The aforementioned oxidizing gas is introduced from the downstream side to the upstream side of the aforementioned tubular furnace.

6. The method for regenerating a carbon fiber bundle according to claim 3 or 4, wherein, The aforementioned inlet pipe is arranged such that the oxidizing gas introduced into the aforementioned heating region forms a turbulent flow.

7. The method for regenerating a carbon fiber bundle according to any one of claims 1 to 4, wherein, The aforementioned through-hole is slit-shaped and formed in the horizontal direction.

8. The method for regenerating a carbon fiber bundle according to any one of claims 1 to 4, wherein, The aforementioned lid is formed with a plurality of the aforementioned through-holes.

9. A regeneration device for a carbon fiber bundle, which is a device for regenerating a carbon fiber bundle from a structure, the structure having: a hollow substrate; And, a carbon fiber reinforced resin layer, comprising carbon fiber bundles wound around the aforementioned hollow substrate and a matrix resin; and, The regenerating device for the carbon fiber bundles has: A first heating unit for heating the aforementioned structure to decompose a part of the aforementioned matrix resin; An unwinding unit for unwinding the intermediate carbon fiber bundles with the decomposition residues of the aforementioned matrix resin attached from the carbon fiber reinforced resin layer after a part of the aforementioned matrix resin is decomposed; A second heating unit for heating the aforementioned unwound intermediate carbon fiber bundles to decompose the decomposition residues of the aforementioned matrix resin, thereby obtaining regenerated carbon fiber bundles; And, A winding unit for winding the aforementioned regenerated carbon fiber bundles; The aforementioned second heating unit is a tubular furnace, and the tubular furnace has: a heater for heating the aforementioned intermediate carbon fiber bundles; and a lid provided at the inlet and outlet and formed with a through-hole through which the aforementioned intermediate carbon fiber bundles can pass.

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