Carbon paper winding method and manufacturing method of carbon paper roll using the same

Abstract

To provide a winding method capable of sufficiently reducing miswinding even when a carbon paper is formed into a large diameter wound body.SOLUTION: A carbon paper winding method for winding a continuously conveyed long carbon paper on a core bobbin is configured such that: a winding is performed at a constant tension of 40 N / m or more to a predetermined tension turning point at which the winding diameter increases by 40 mm or more as compared with that at the start of winding; after the tension turning point, the winding is performed while reducing the tension; and the tension at the end of winding is set to 20 N / m or more.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method for winding carbon paper. Carbon paper is mainly used as a gas diffusion electrode substrate for fuel cells such as solid polymer fuel cells and methanol fuel cells, and as an electrode substrate for batteries that use gases such as oxygen and hydrogen as active materials. [Background technology]

[0002] Porous carbon paper, in which short carbon fibers are bound with resin carbide, is generally used as a material for the gas diffusion electrode substrate that constitutes the membrane-electrode assembly in which the power generation reaction occurs in the fuel cell. When transporting long carbon paper, it is necessary to wind the carbon paper and handle it as a roll. However, when winding carbon paper, which has a small surface friction coefficient and is highly brittle, if the winding tension is low, the paper will slip when wound, and if the winding tension is high, the paper will not slip when wound, but it will easily break due to small scratches on the edge of the carbon paper, which makes it difficult to control the winding conditions.

[0003] Patent Document 1 proposes a method for winding carbon paper in which the initial winding tension is 30 N / m or more, the final winding tension is 20 N / m or more, and the winding tension is gradually reduced from the beginning to the end of winding. However, because carbon paper is porous and prone to thickness deformation, even if the winding tension is gradually reduced while winding, the effect of gradually reducing the tension is reduced due to the relaxation of pressure between the carbon paper sheets, and there is still a problem of winding misalignment occurring, particularly when attempting to make a large diameter.

[0004] Patent Document 2 also proposes that the final winding tension T2 be equal to or greater than the initial winding tension T1, and that T2 be equal to or less than a value calculated using the winding diameter. However, because the cumulative tightening force from the outer carbon paper is applied to the inner carbon paper, there are problems with the inner carbon paper being tightly wound, particularly with low-density carbon paper, and with slippage due to a reduction in the carbon paper thickness. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-302557 A [Patent Document 2] JP 2008-247610 A Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a winding method capable of sufficiently reducing winding misalignment even when carbon paper is wound into a large diameter body (typically when the winding diameter is 500 mm or more at the end of winding). [Means for solving the problem]

[0007] The present invention for solving the above problems is as follows. (1) A method for winding carbon paper in which a long piece of carbon paper is continuously transported and wound around a core bobbin, the method comprising the steps of: winding the carbon paper at a constant tension of 40 N / m or more up to a predetermined tension turning point at which the winding diameter increases by 40 mm or more compared to the start of winding; winding the carbon paper while decreasing the tension after the tension turning point; and winding the carbon paper to a tension of 20 N / m or more at the end of winding. (2) The method for winding carbon paper according to (1), wherein the rate of change in the winding diameter of the carbon paper from the start of winding to the tension turning point is 20 to 160%. (3) The method for winding carbon paper according to (1) or (2), wherein the rate of change in winding diameter of the carbon paper after the tension turning point is 10 to 250%. (4) The method for winding carbon paper according to any one of (1) to (3), wherein the rate of change in winding torque after the tension turning point has passed is −100 to +160%. (5) The method for winding carbon paper according to any one of (1) to (4), wherein the wound diameter upon completion of winding is 500 mm or more. (6) The method for winding carbon paper according to any one of (1) to (5), wherein the core bobbin has an outer diameter of 76 mm or more. (7) The method for winding carbon paper according to any one of (1) to (6), which is used for winding carbon paper having a flexural modulus of 2 to 50 GPa, a static friction coefficient of 0.1 to 0.7, and a tensile strength of 1 to 10 kN / m. (8) A method for winding carbon paper according to any one of (1) to (7), further comprising providing an end position detection means for detecting the end position of the carbon paper before winding, and controlling the winding to prevent misalignment based on a detection signal from the end position detection means. (9) A method for producing a carbon paper roll, comprising the method for winding carbon paper according to any one of (1) to (8). Effect of the Invention

[0008] According to the present invention, when carbon paper is continuously wound up, a roll can be produced that has little winding misalignment even when the roll has a large diameter, preventing the roll from coming undone during packaging, transportation, etc., and improving the handleability of the carbon paper roll. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a side view showing an example of a state in which a winding misalignment occurs in a carbon paper roll. [Diagram 2] FIG. 1 is a schematic side view showing one embodiment of a winding device for carrying out the winding method of the present invention. [Diagram 3] FIG. 1 is a front view showing an embodiment of a means for detecting the end position of carbon paper. [Figure 4] Graph showing the change in winding tension from the start of winding in Examples and Comparative Examples DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, in this specification, "~" is used as a symbol indicating a range including both ends of the range.

[0011] Carbon paper is a structure formed by binding a paper body containing short carbon fibers with a carbonized organic material such as phenolic resin. Carbon paper has a high bending elastic modulus, a low static friction coefficient, a tendency to reduce in thickness under pressure, and is brittle, so the winding method of the present invention can be preferably applied to carbon paper. Carbon paper is preferably used as a gas diffusion electrode substrate for fuel cells such as solid polymer fuel cells and methanol fuel cells, and as an electrode substrate for batteries that use gases such as oxygen and hydrogen as the active material.

[0012] The carbon fibers constituting the carbon paper can be any of PAN-based, pitch-based, rayon-based, etc., but PAN-based carbon fibers are preferred because they are less likely to break during production or use. Organic substances that serve as precursors of charcoal that bind the carbon fibers include phenolic resins, furan resins, pitch, tar, etc., and thermosetting resins that are easy to process, such as impregnation and molding, are preferred, and phenolic resins with a high residual carbon rate are even more preferred.

[0013] The short carbon fibers constituting the carbon paper preferably have a fiber length of 3 to 20 mm, more preferably 5 to 15 mm. By setting the fiber length of the short carbon fibers within the above range, the dispersibility of the short carbon fibers during papermaking can be improved, and the variation in basis weight can be suppressed.

[0014] The carbon paper may be treated to be water-repellent with a fluororesin such as polytetrafluoroethylene (PTFE). The winding method of the present invention is also effective for winding carbon paper as a gas diffusion electrode substrate having a surface covered with a mixture layer (microporous layer of a gas diffusion electrode substrate) of carbon particles such as carbon black or graphite powder and a water-repellent resin such as PTFE. That is, in this specification, the term "carbon paper" is used to include those having such additional elements.

[0015] The bending modulus of the carbon paper is preferably 2 to 50 GPa, more preferably 2 to 30 GPa, and even more preferably 2 to 20 GPa. If the bending modulus of the carbon paper is less than 2 GPa, for example, when used as a gas diffusion electrode substrate for a fuel cell, the handling property is poor and the paper may fall into the groove of the separator. If the bending modulus of the carbon paper is greater than 50 GPa, the carbon paper is less likely to fit the core bobbin due to its rigidity when wound into a roll on a core bobbin, which may reduce the ease of winding and cause winding misalignment. The bending modulus of the carbon paper can be determined in accordance with the method specified in JIS K 6911 (1995). At this time, the width of the test piece is 15 mm, the length is 40 mm, and the distance between the supports is 15 mm. The radius of curvature between the support and the indenter is 3 mm, and the loading speed is 2 mm / min. The bending modulus is an index indicating the ease of winding into a roll and the quality of handling.

[0016] The static friction coefficient of the carbon paper is preferably 0.1 to 0.7, more preferably 0.2 to 0.6, and even more preferably 0.2 to 0.5. If the static friction coefficient of the carbon paper is smaller than 0.1, the friction force between the layers of the carbon paper in the roll is small, so that the end misalignment is likely to occur after winding. If the static friction coefficient of the carbon paper is larger than 0.7, a roll of carbon paper with uniform roll end faces can be obtained by conventional technology. The static friction coefficient of the carbon paper can be measured using a static friction coefficient measuring device "Portable Friction Meter Muse Type: 94i" manufactured by Shinto Scientific Co., Ltd. One sample cut to a diameter of 25 mm is attached to a weight on the bottom surface of the measuring device, the measuring device is placed on the other sample, and when measurement is started, a load is automatically applied to move the weight horizontally. The load at the moment when it starts to slide is the maximum static friction force F (N), and the weight of the weight is the vertical force G (N), and the static friction coefficient μ is measured. The static friction coefficient μ can be calculated from the following formula. The measurement is carried out 10 times, and the static friction coefficient is calculated from the average value of the 10 measurements.

[0017] μ=F / G The tensile strength of the carbon paper is preferably 1 to 10 kN / m, and more preferably 2 to 10 kN / m. If it is less than 1 kN / m, the handling property tends to decrease. The tensile strength of the carbon paper is measured by pulling a test piece of 15 mm x 100 mm at a pulling speed of 2 mm / min and measuring the tension at the time of breakage. At this time, the long carbon paper is sampled so that the longitudinal direction is 100 mm. The measurement is performed five times, and the tensile strength is calculated from the average value of the five pieces.

[0018] The continuously transported long carbon paper is wound around a core bobbin to form a wound body. In order to prevent the wound carbon paper from cracking, the outer diameter of the core bobbin is preferably 76 mm or more, more preferably 152 mm or more. On the other hand, if the outer diameter of the core bobbin is too large, even if a long carbon paper is wound, the rate of change of the winding diameter is small, so that it tends to be difficult to obtain the effect of suppressing the winding misalignment. In addition, the entire wound body becomes large, which causes a problem of reduced handleability. Therefore, the outer diameter of the core bobbin is preferably 400 mm or less, more preferably 250 mm or less.

[0019] In the winding method of the present invention, the carbon paper is wound with a constant tension until a predetermined point where the winding diameter increases by a certain amount or more compared to the start of winding. In this specification, the predetermined point is called the "tension turning point" and is defined as the increase (mm) of the winding diameter compared to the start of winding. In the present invention, the carbon paper is wound with a constant tension until the winding diameter increases by 40 mm or more compared to the start of winding. In this case, the tension turning point is expressed as being 40 mm or more. In the present invention, the tension turning point is 40 mm or more, and more preferably 60 mm or more. If the portion wound with a constant tension is small, winding deviation is likely to occur near the tension turning point. If the range of the constant tension is large, winding deviation at the inner circumference will worsen, so 450 mm or less is preferable.

[0020] In the present invention, the constant winding tension up to the tension turning point is set to 40 N / m or more, preferably 200 N / m or more, in order to prevent winding slippage, and is preferably set to 10 kN / m or less in order to prevent breakage of the highly brittle carbon paper.

[0021] The rate of change (A) of the winding diameter from the start of winding to the tension turning point is preferably 20 to 160%, and more preferably 20% to 100%. If it is less than 20%, the effect of preventing winding slippage due to constant tension is insufficient, and if it exceeds 160%, there is a possibility that winding slippage will become large, similar to the constant tension winding in the comparative example described later. The rate of change (A) of the winding diameter from the start of winding to the tension turning point is calculated by the following formula.

[0022] A = (D2-D1) / D1 x 100 A: Rate of change in winding diameter from the start of winding to the tension turning point D1: Winding diameter at the start of winding D2: Winding diameter at tension turning point The winding diameter D1 at the start of winding is the outer diameter of the core bobbin around which the carbon paper is wound, and is measured with a vernier caliper or ruler. The winding diameter after winding is calculated by detecting the outermost surface position of the wound carbon paper with an infrared sensor. Alternatively, it is calculated from the thickness of the carbon paper to be wound, which is measured in advance, the number of rotations of the winding shaft, and D1.

[0023] The winding tension is measured by a tensiometer set on a free roll.

[0024] In the present invention, after the tension turning point, the tension is reduced while winding, and the tension at the end of winding is set to 20 N / m or more. The tension at the end of winding is more preferably 50 N / m or more. If the final winding tension is less than 20 N / m, the winding is likely to collapse during packaging, transportation, and unwinding.

[0025] The rate of change (B) of the winding diameter after the tension turning point is preferably 10 to 250%, and more preferably 100% to 220%. If the rate of change is less than 10%, the effect of reducing the tension and suppressing winding slippage tends not to be sufficient, and if it exceeds 250%, winding slippage tends to occur more easily, as in the case where the tension is gradually reduced from the start of winding. The rate of change (B) of the winding diameter after the tension turning point is calculated using the following formula.

[0026] B = (D3-D2) / D2 x 100 B: Rate of change in winding diameter after passing the tension turning point D2: Winding diameter at tension turning point D3: Winding diameter at the end of winding Furthermore, the rate of change (C) of the winding torque after the tension turning point is preferably -100% to +160%, and more preferably -90% to 50%. If the rate of change is less than -100%, the winding tends to collapse during packaging, transportation, and unwinding, and the handleability of the wound body tends to decrease. If the rate of change exceeds +160%, winding misalignment tends to worsen. The rate of change (C) of the winding torque after the tension turning point is calculated using the following formula.

[0027] C=(T3×D3-T2×D2) / (T2×D2)×100 C: Rate of change in winding torque after passing the tension turning point T2: Tension at the tension turning point T3: Tension at the end of winding D2: Winding diameter at tension turning point D3: Winding diameter at the end of winding As shown in Figure 1, the amount of winding misalignment t is calculated by dividing the total width W of the roll including the winding misalignment by the width W of the carbon paper. S can be measured using a scale or calipers and calculated using the following formula.

[0028] t=WW S t: Winding deviation (mm) W: Overall width including winding misalignment of the winding body (mm) W S : Carbon paper width (mm) In order to prevent winding misalignment caused by the winding position being shifted in a direction parallel to the central axis of the winding shaft due to meandering of the carbon paper, etc., when winding carbon paper by the method of the present invention, it is preferable to provide end position detection means 6 that detects the end position of the carbon paper before winding and to control to prevent winding misalignment based on the detection signal of the end position detection means, as shown in Figure 2. Specifically, it is preferable to move the winding shaft 3, nip roll 5, free roll 7, etc., arranged downstream of the end position detection means, in a direction parallel to the central axis of the winding shaft, i.e., in a left-right direction perpendicular to the traveling direction of the carbon paper, based on the detection signal of the end position detection means 6, to make the winding device follow the meandering of the carbon paper and reduce winding misalignment.

[0029] Fig. 3 is a front view showing one embodiment of carbon paper end position detection means. As shown in Fig. 3, end position detection means 6 is preferably installed so as to be able to detect the position of either the left or right end in the traveling direction of carbon paper 1, or both ends. As the carbon paper end position detection means, it is preferable to use a non-contact carbon paper end position detection means such as EPC (registered trademark: Nireco Corporation). The sensor section of the carbon paper end position detection means may be a photoelectric sensor using an infrared emitting diode as a light source, an ultrasonic sensor, or a detection method using air pressure, but there are no particular restrictions.

[0030] It goes without saying that the method for producing carbon paper, including the winding method described above, is also understood to be one aspect of the present invention. EXAMPLES

[0031] The present invention will now be described more specifically with reference to examples.

[0032] [Example 1] Polyacrylonitrile carbon fiber "TORAYCA" (registered trademark) T300-6K (average single fiber diameter: 7 μm, number of single fibers: 6000) manufactured by Toray Industries, Inc. was cut to a length of 12 mm and continuously paper-formed using water as a paper-forming medium. The paper was then immersed in a 10% by weight aqueous solution of polyvinyl alcohol and dried to obtain a carbon fiber basis weight of approximately 37 g / m. 2 The carbon fiber paper was wound into a roll. The amount of polyvinyl alcohol attached was 20 parts by weight per 100 parts by weight of the carbon fiber paper.

[0033] A dispersion liquid was prepared by mixing flake graphite (average particle size 5 μm), phenol resin, and methanol. The carbon fiber paper was continuously impregnated with the dispersion liquid so that the phenol resin was 110 parts by weight per 100 parts by weight of carbon fiber paper, and the carbon fiber paper was dried and wound into a roll. The phenol resin used was a 1:1 mixture of resol-type phenol resin and novolac-type phenol resin by solid weight.

[0034] Next, the resin-impregnated carbon fiber sheet was set in a press molding machine so that the upper and lower plates were parallel to each other, and subjected to a heating and pressurizing treatment at a plate temperature of 200°C while being intermittently transported by repeatedly opening and closing the press, and the resulting pre-fired carbon paper was wound into a roll.

[0035] The obtained carbon paper was baked in a heating furnace maintained in a nitrogen gas atmosphere at a maximum temperature of 2000°C, and then wound into a roll. The obtained carbon paper had a thickness of 0.18 mm, a porosity of 80%, a flexural modulus of 10 GPa, a static friction coefficient of 0.3, and a tensile strength of 2.5 kN / m.

[0036] The carbon paper is wound up as shown in Fig. 2. The carbon paper is wound up on a core bobbin 4 with an outer diameter of 170 mm using a carbon paper winding device that includes a winding shaft 3 that winds up the carbon paper into a roll, a nip roll 5 that nips the carbon paper 1 in front of the winding shaft 3, a carbon paper end position detection means 6 provided upstream of the nip roll 5, a moving means that moves the winding shaft in a direction parallel to the central axis of the winding shaft based on a detection signal from the position detection, and a control unit that controls the moving means. The carbon paper is wound up on a core bobbin 4 with an outer diameter of 170 mm, and a carbon paper with a width of 300 mm and a length of 1600 m is wound up to a winding diameter D2 = 240 mm (tension turning point = 70 mm) with a winding tension T1 = 800 N / m at the start of unwinding, and then the tension is gradually decreased at a constant rate per length, and the carbon paper is wound up to a tension T3 = 100 N / m at the end of winding. Stable winding was possible without problems such as large winding deviation, breakage, or chipping. The specifications and winding results are shown in Table 1. The transition of winding tension is shown in Figure 4.

[0037] [Example 2] The winding was performed in the same manner as in Example 1, except that the winding was performed at T1 = 850 N / m until the winding diameter D2 = 400 mm (tension turning point = 230 mm) and the tension at the end of winding was T3 = 600 N / m. The specifications and winding results are shown in Table 1. The transition of the winding tension is shown in Figure 4.

[0038] [Example 3] A carbon paper with a length of 1100 m was wound up to a winding diameter D2 of 220 mm at T1 = 780 N / m (tension turning point = 50 mm), and the tension at the end of winding was set to T3 = 250 N / m, and the paper was wound up in the same manner as in Example 1. The specifications and winding results are shown in Table 1. The transition of the winding tension is shown in Figure 4.

[0039] [Example 4] The winding was performed in the same manner as in Example 1, except that the winding was performed at T1 = 751 N / m until the winding diameter D2 = 244 mm (tension turning point = 74 mm) and the tension at the end of winding was T3 = 578 N / m. The specifications and winding results are shown in Table 1. The transition of the winding tension is shown in Figure 4.

[0040] [Comparative Example 1] A 1000 m long carbon paper was wound in the same manner as in Example 1, except that the tension was kept constant at T1 = 430 N / m until the end of winding. When 1000 m was wound, the winding deviation became large. The specifications and winding results are shown in Table 1. The transition of the winding tension is also shown in Figure 4.

[0041] [Comparative Example 2] A 1000m long carbon paper was wound up at T1 = 30N / m until the winding diameter D2 = 200mm (tension turning point = 30mm), and the tension at the end of winding was T3 = 20N / m, and it was wound up in the same manner as in Example 1. When 600m was wound up, the winding deviation became large. The specifications and winding results are shown in Table 1. The change in winding tension is shown in Figure 4.

[0042] [Example 5] Carbon paper having a thickness of 0.15 mm, a porosity of 80%, a flexural modulus of 7 GPa, a static friction coefficient of 0.3, and a tensile strength of 2 kN / m was obtained in the same manner as in Example 1, except that the weight of the carbon fiber was 30.5 g / m2. The carbon paper having a length of 1800 m was wound up to a winding diameter D2 of 222 mm at T1 = 499 N / m (tension turning point = 52 mm), and the tension at the end of winding was T3 = 333 N / m, and was wound up in the same manner as in Example 1. The specifications and winding results are shown in Table 1. The transition of the winding tension is shown in FIG. 4.

[0043] [Example 6] The winding was performed in the same manner as in Example 5, except that the winding was performed at T1 = 521 N / m until the winding diameter D2 = 232 mm (tension turning point = 62 mm) and the tension at the end of winding was T3 = 155 N / m. The specifications and winding results are shown in Table 1. The transition of the winding tension is shown in Figure 4.

[0044] [Comparative Example 3] The winding was performed in the same manner as in Example 5, except that the tension was kept constant until the end of winding at T1 = 400 N / m. When the winding length reached 1,300 m, the winding deviation became large and winding was stopped. The specifications and winding results are shown in Table 1. The transition of the winding tension is also shown in Figure 4.

[0045] [Example 7] The carbon paper described in Example 5 was heat-treated at 2000°C and then wound into a roll, which was then unwound, immersed in a PTFE aqueous dispersion, and then pulled up and dried in a tunnel dryer set at 110°C. The PTFE adhesion rate of the carbon paper was set to 2wt%. Next, a microporous layer coating liquid containing PTFE and carbon black was applied using a die coater, and the paper was passed through a dryer at 110°C to dry out the moisture, and then passed through a sintering furnace set at a temperature of 350°C to perform sintering. After slitting both ends, a long piece of paper with a thickness of 0.05mm was layered on top of the paper to prevent the microporous layer from being transferred to the carbon paper, and the paper was wound up with a winding machine. The obtained carbon paper with a microporous layer on one side had a thickness of 0.18mm, a bending modulus of elasticity of 5GPa, a static friction coefficient of 0.5, and a tensile strength of 5kN / m. The carbon paper, 280 mm wide and 1600 m long, with the above-mentioned microporous layer on one side, was wound up at T1 = 350 N / m until the winding diameter D2 = 350 mm (tension turning point = 180 mm), after which the tension was reduced while winding, and the tension at the end of winding was set to T3 = 130 N / m. The specifications and winding results are shown in Table 1. The transition of the winding tension is shown in Figure 4.

[0046] [Example 8] The carbon paper having a length of 1100 m was wound up at T1 = 514 N / m until the winding diameter D2 = 429 mm (tension turning point = 259 mm), and the tension at the end of winding was T3 = 201 N / m, but was wound up in the same manner as in Example 7. The specifications and winding results are shown in Table 1. The transition of the winding tension is shown in Figure 4.

[0047] [Comparative Example 4] The winding was performed in the same manner as in Example 8, except that the tension was kept constant until the end of winding at T1 = 514 N / m. The winding was stopped when the winding length reached 1100 m. The specifications and winding results are shown in Table 1. The transition of the winding tension is also shown in Figure 4.

[0048] [Table 1] [Explanation of symbols]

[0049] 1: Carbon paper 2: Carbon paper roll 3: Winding shaft 4: Core bobbin 5: Nip roll 6: Carbon paper end position detection means 7. Freerolls W: Overall width of the carbon paper roll including any misalignment W S : Carbon paper width

Claims

1. A carbon paper winding method for winding a continuous long piece of carbon paper around a core bobbin, comprising the steps of: A method for winding carbon paper, comprising the steps of winding the carbon paper at a constant tension of 40 N / m or more up to a predetermined tension turning point at which the winding diameter increases by 40 mm or more compared to the start of winding, winding the carbon paper while decreasing the tension after the tension turning point has passed, and winding the carbon paper at a tension of 20 N / m or more at the end of winding.

2. 2. The carbon paper winding method according to claim 1, wherein a rate of change in winding diameter of the carbon paper from the start of winding to the tension turning point is 20 to 160%.

3. 3. The carbon paper winding method according to claim 1, wherein a rate of change in winding diameter of the carbon paper after the tension turning point has passed is 10 to 250%.

4. 4. The carbon paper winding method according to claim 1, wherein the rate of change in winding torque after the tension turning point has passed is from -100 to +160%.

5. The method for winding carbon paper according to any one of claims 1 to 4, wherein the wound diameter at the end of winding is 500 mm or more.

6. The carbon paper winding method according to any one of claims 1 to 5, wherein the outer diameter of the core bobbin is 76 mm or more.

7. The method for winding carbon paper according to any one of claims 1 to 6, which is used for winding carbon paper having a flexural modulus of 2 to 50 GPa, a static friction coefficient of 0.1 to 0.7, and a tensile strength of 1 to 10 kN / m.

8. The method for winding carbon paper according to any one of claims 1 to 7, further comprising providing an end position detection means for detecting an end position of the carbon paper before winding, and controlling the winding to prevent deviation based on a detection signal from the end position detection means.

9. A method for producing a carbon paper roll, comprising the carbon paper winding method according to any one of claims 1 to 8.

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