Copper foil winding apparatus
The copper foil winding device addresses defects by controlling angles and distances between rotating bodies to apply uniform pressure, ensuring high-quality copper foil production.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- VOLTA ENERGY SOLUTIONS SARL
- Filing Date
- 2025-12-23
- Publication Date
- 2026-07-02
AI Technical Summary
Copper foil is prone to defects such as wrinkles, bubbles, and tearing during winding due to excessive tension or uneven surfaces, which affects product quality.
A copper foil winding device with a first body rotating around a first axis, a second body rotating around a second axis, a third body pressing the foil, and a fourth body connected by an extension part, where the angles and distances between these bodies are carefully controlled to apply uniform pressure during winding.
Prevents lifting and ensures high-quality copper foil production by maintaining uniform pressure and preventing defects like wrinkling and tearing.
Smart Images
Figure IB2025063362_02072026_PF_FP_ABST
Abstract
Description
[0001] [DESCRIPTION]
[0002] [Invention Title]
[0003] Copper Foil Winging Apparatus
[0004] [Technical Field]
[0005] The present disclosure relates to a copper foil winding device.
[0006] [Background Art]
[0007] Copper foil is a high-precision metal foil used for manufacturing current collectors for secondary batteries, circuit boards for electronic circuits, or electronic components. It can be continuously produced through methods such as electroplating and is wound into a roll form for storage or transferred to the next process.
[0008] However, copper foil is very thin and has low mechanical strength, so if the tension is excessive or the winding surface is uneven during winding, defects such as wrinkles, bubbles, and tearing may occur, which can cause a decrease in product quality.
[0009] [Disclosure]
[0010] [Technical Problem]
[0011] The problem that the present disclosure aims to solve is to provide a copper foil winding device capable of preventing lifting of the copper foil through uniform pressure during the copper foil winding process.
[0012] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below.
[0013] [Technical Solution]
[0014] A copper foil winding device according to one embodiment of the present disclosure comprises a first body that rotates around a first axis and winds a copper foil, a second body that rotates around a second axis and winds a copper foil unwound from the first body onto its outer surface, a third body arranged to press the copper foil wound onto the outer surface of the second body, a fourth body positioned according to the arrangement direction of the third body, and an extension part that connects both ends of the third body and the fourth body, respectively, wherein the angle at which a virtual first line connecting the area where the third body presses the copper foil and the second axis and a virtual second line connecting the area where the copper foil unwound from the first body meets the copper foil wound on the second body meets the second axis is within the range of 1 degree to 30 degrees.
[0015] The area where the third body presses the copper foil along the rotational direction of the second body may be formed to be positioned behind the area where the copper foil unwound from the first body meets the copper foil wound on the second body.
[0016] The first body can rotate in the opposite direction to the second body.
[0017] The copper foil can be wound out from the lower side of the first body and wound up from the upper side of the second body.
[0018] The angle at which the virtual first line connecting the area where the third body presses the copper foil and the second axis, and the virtual second line connecting the area where the copper foil unwound from the first body meets the copper foil wound on the second body and the second axis meet may be in the range of 5 to 18 degrees.
[0019] The angle at which the virtual first line connecting the area where the third body presses the copper foil and the second axis, and the virtual second line connecting the area where the copper foil unwound from the first body meets the copper foil wound on the second body and the second axis meet can gradually decrease as the copper foil is wound on the second body.
[0020] The distance between the area where the third body presses the copper foil and the area where the copper foil unwound from the first body meets the copper foil wound on the second body may decrease and then increase as the copper foil is wound on the second body.
[0021] The distance between the area where the third body presses the copper foil and the area where the copper foil unwound from the first body meets the copper foil wound on the second body may be in the range of 20 mm to 80 mm.
[0022] The first body, the second body, the third body, and the fourth body can each be arranged side by side.
[0023] The first body may be configured to be movable in a direction closer to or further away from the second body.
[0024] The third body may be provided to be rotatable about the fourth body as an axis. The third body may press the copper foil by its own weight.
[0025] [Advantageous Effects]
[0026] According to one embodiment of the present disclosure, a copper foil winding device can be provided that prevents lifting of the copper foil through uniform pressure during the copper foil winding process.
[0027] However, the effects obtainable through the present invention are not limited to the effects described above, and other technical effects not mentioned will be clearly understood by a person skilled in the art from the description of the invention below.
[0028] [Description of Drawings]
[0029] FIG. 1 illustrates a copper foil winding device according to one embodiment of the present disclosure. FIG. 2 to 4 illustrate the operation of a copper foil winding device according to one embodiment of the present disclosure.
[0030] FIG. 5 is a drawing for explaining the position change of a first body according to one embodiment of the present disclosure.
[0031] Figure 6 illustrates wrinkles formed on the surface of a copper foil.
[0032] FIG. 7 illustrates a copper foil manufactured by the copper foil winding device of the present invention. [Mode for Invention]
[0033] Hereinafter, the present disclosure will be described in detail with reference to the attached drawings. However, this is merely illustrative and the present disclosure is not limited to the specific embodiments described illustratively.
[0034] Specific terms used in this specification are for convenience of explanation only and are not intended to limit the exemplified embodiments.
[0035] For example, expressions such as “identical” and “identical” indicate not only a strictly identical state, but also a state in which there is a tolerance or a difference in the degree to which the same function is obtained.
[0036] For example, expressions indicating relative or absolute arrangements such as “in a certain direction,” “along a certain direction,” “parallel,” “perpendicular,” “to the center,” “concentric,” or “coaxial” not only strictly indicate such arrangements, but also indicate a state of relative displacement with a tolerance or an angle or distance such that the same function is obtained.
[0037] To explain the present disclosure, the following description is based on a spatial orthogonal coordinate system formed by mutually orthogonal five axes, the Y-axis, and the Z-axis. Each axis direction (X-axis direction, Y-axis direction, Z-axis direction) refers to both directions in which each axis extends.
[0038] The five directions, five directions, and Z direction mentioned below are for the purpose of explaining so that the present disclosure can be clearly understood, and it goes without saying that each direction may be defined differently depending on where the reference is placed.
[0039] The use of terms such as 'first, second, third,' etc., attached to the components mentioned below is intended solely to avoid confusion regarding the components being referred to, and is unrelated to the order, importance, or master-subordinate relationship between the components. For example, an invention including only the second component without the first component can also be implemented.
[0040] The terms used in this disclosure are for the description of specific embodiments and are not intended to limit the scope of the claims. As used in the description of embodiments and in the appended claims, the singular form is intended to include the plural form unless the context clearly indicates otherwise.
[0041] FIG. 1 illustrates a copper foil winding device (10) according to one embodiment of the present disclosure, FIG. 2 to FIG. 4 illustrate the operation of the copper foil winding device (10) according to one embodiment of the present disclosure, and FIG. 5 is a drawing for explaining the position change of the first body (110) according to one embodiment of the present disclosure.
[0042] The copper foil winding device (10) of the present disclosure may include a first body (110), a second body (120), a third body (130), a fourth body (140), and an extension part (200). The first body (110) may include an axis. In this specification, the axis included in the first body (110) may be defined as a first axis (111). The first body (110) may rotate around the first axis (111). The first body (110) may wind copper foil and unwind copper foil. Copper foil may be formed by electrodeposition on a drum, and the formed copper foil may be transferred to the first body (110). The first body (110) can rotate and wind the transported copper foil. The copper foil wound from the first body (110) can be wound onto the second body (120). The second body (120) may include an axis. In this specification, the axis included in the second body (120) may be defined as a second axis (121). The first body (110) and the second body (120) may be arranged side by side.
[0043] Referring to FIG. 1, the first axis (111) and the second axis (121) may each extend in the Y-axis direction. As the first axis (111) rotates, copper foil may be wound or unwound on the outer surface of the first body (110). As the second axis (121) rotates, copper foil may be wound or unwound on the outer surface of the second body (120). As the second body (120) rotates, copper foil unwound from the first body (110) may be wound on the outer surface of the second body (120).
[0044] The third body (130) may be positioned to press the copper foil wound on the outer surface of the second body (120). The third body (130) may be positioned parallel to the second body (120). The third body (130) may press the copper foil wound on the outer surface of the second body (120). The third body (130) may include an axis. In this specification, the axis included in the third body (130) may be defined as a third axis. The third body (130) may press the copper foil by its own weight.
[0045] The fourth body (140) may be positioned according to the arrangement direction of the third body (130). The fourth body (140) may be arranged parallel to the third body (130). The fourth body (140) may be connected to the third body (130). By connecting the third body (130) and the fourth body (140), the third body (130) may rotate around the fourth body (140) as an axis. Since the third body (130) is designed to be rotatable, the position of the third body (130) may change when the thickness of the copper foil wound on the second body (120) changes.
[0046] The first body (110), the second body (120), the third body (130), and the fourth body (140) can be arranged side by side with each other.
[0047] The extension part (200) can connect both ends of the third body (130) and the fourth body (140), respectively. The extension part (200) may include a first leg and a second leg. Referring to FIG. 1, the first leg and the second leg may be arranged side by side with each other. The first leg and the second leg may be connected to the third body (130) and the fourth body (140), respectively. For example, the first leg may connect one side of the third body (130) and one side of the fourth body (140). The second leg may connect the other side of the third body (130) and the other side of the fourth body (140). By including the first leg and the second leg, the load of the third body (130) may not be biased to one side.
[0048] The length of the extension part (200) can be adjusted. The lengths of the first leg and the second leg, respectively, can be adjusted. If the length of the first leg increases, the distance between the third body (130) and the fourth body (140) may increase. If the length of the first leg decreases, the distance between the third body (130) and the fourth body (140) may decrease.
[0049] The second leg may be formed identically to the first leg. The length of the second leg may be the same as the length of the first leg. As described above, when the length of the first leg is adjusted, the length of the second leg may be adjusted to be the same as the length of the first leg.
[0050] Referring to FIG. 2, the appearance of a copper foil (FL) being wound on a copper foil winding device (10) of the present disclosure is described. By rotating the first body (110), the copper foil (FL) can be unwound from the first body (110). The copper foil (FL) unwound from the first body (110) can be wound onto the second body (120). In order for the copper foil (FL) to be unwound onto the first body (110) and simultaneously wound onto the second body (120), the first body (110) and the second body (120) can be rotated in opposite directions.
[0051] The first body (110) may be located above the second body (120). The copper foil may be wound from the lower side of the first body (110). The copper foil may be wound from the upper side of the second body (120).
[0052] Meanwhile, an area may be formed in which the third body (130) presses the copper foil (FL) wound on the second body (120). In this specification, a virtual line connecting the area in which the third body (130) presses the copper foil wound on the second body (120) and the second axis (121) may be defined as the first line (B1).
[0053] The area where the third body (130) presses the copper foil wound on the second body (120) may be the area where a virtual line connecting the second axis (121) and the third axis meets the outer surface of the second body (120). When the copper foil is wound on the outer surface of the second body (120), the area where the virtual line connecting the second axis (121) and the third axis meets the copper foil wound on the outermost edge of the second body (120) may be the area.
[0054] Additionally, the second body (120) may rotate and the copper foil may be wound on the outer surface of the second body (120). The copper foil may form an area where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120). In this specification, a virtual line connecting the area where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) and the second axis (121) may be defined as the second line (B2).
[0055] The angle (G1) at which the first line (B1) and the second line (B2) meet may be an acute angle. That is, the angle (G1) at which the first line (B1) and the second line (B2) meet may be 30 degrees or less, 29.00 degrees or less, 28.00 degrees or less, 27.00 degrees or less, 26.00 degrees or less, 25.00 degrees or less, 24.00 degrees or less, 23.00 degrees or less, 22.00 degrees or less, 21.00 degrees or less, 20.00 degrees or less, 19.00 degrees or less, or 18.00 degrees or less.
[0056] In addition, the angle (G1) at which the first line (B1) and the second line (B2) meet may be 4.00 degrees or more, 4.10 degrees or more, 4.20 degrees or more, 4.30 degrees or more, 4.40 degrees or more, 4.50 degrees or more, 4.60 degrees or more, 4.70 degrees or more, 4.80 degrees or more, 4.90 degrees or more, 5.00 degrees or more, 5.10 degrees or more, 5.20 degrees or more, 5.30 degrees or more, 5.40 degrees or more, 5.50 degrees or more, 5.60 degrees or more, 5.70 degrees or more, 5.80 degrees or more, or 5.90 degrees or more.
[0057] The angle (G1) at which the first line (B1) and the second line (B2) meet may be 30.00 degrees or less and 4.00 degrees or more, preferably 20.00 degrees or less and 4.50 degrees or more, more preferably 19.00 degrees or less and 5.00 degrees or more, more specifically 18.50 degrees or less and 4.50 degrees or more, more preferably 18.00 degrees or less and 5.00 degrees or more.
[0058] If the angle (G1) where the first line (B1) and the second line (B2) meet is greater than 30.00 degrees, a relatively long time is required between the copper foil being wound onto the second body (120) and being pressed by the third body (130), so air may be introduced during the process of winding the copper foil, and due to the introduced air, the winding of the copper foil may not proceed uniformly, and lifting or wrinkling of the copper foil may occur.
[0059] When the angle (G1) where the first line (B1) and the second line (B2) meet is less than 1.00 degrees, the copper foil is pressed by the third body (130) immediately after being wound onto the second body (120), and the pressure applied to the copper foil becomes relatively higher, so tearing may occur in the copper foil. In addition, since pressure is applied before the copper foil is stably wound onto the second body (120) and settles in place, there is a possibility that wrinkles may occur, and there is also a possibility that tearing may occur when the wrinkled copper foil is wound.
[0060] The angle (G1) at which the first line (B1) and the second line (B2) meet is adjusted to within the above range, thereby preventing lifting and wrinkling of the copper foil and enabling the production of high-quality copper foil.
[0061] The angle at which a virtual first line (B1) connecting the area where the third body (130) presses the copper foil and the second axis (121), and a virtual second line (B2) connecting the area where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) and the second axis (121) meet can be gradually reduced as the copper foil is wound on the second body (120). As the copper foil is wound on the second body (120), the thickness of the copper foil stacked on the outer surface of the second body (120) can be increased. At this time, the angle at which the virtual first line (B1) connecting the area where the third body (130) presses the copper foil and the second axis (121), and the virtual second line (B2) connecting the area where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) and the second axis (121) meet can gradually decrease as the thickness of the copper foil increases.
[0062] The area where the third body (130) presses the copper foil along the rotational direction of the second body (120) may be positioned behind the area where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120). Referring to FIG. 2, the second body (120) may rotate in a counterclockwise direction. After the copper foil unwound from the second body (120) comes into contact with the copper foil wound on the second body (120), the copper foil may be pressed by the third body (130). Through this structure, the third body (130) can press the copper foil placed on the outer surface of the second body (120), rather than the copper foil separated from the second body (120).
[0063] The distance between the area (A1) where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) can be adjusted together so that a copper foil of excellent quality can be manufactured. The distance between the area (A1) where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) can be in the range of 20 mm to 80 mm. Referring to FIG. 2, the distance between the area (A1) where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) may not be the straight-line distance between the two areas, but rather the actual distance wound on the outer surface of the second body (120). The distance between the area (A1) where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) may be measured along the circumferential direction of the second body (120).
[0064] The above distance may be 21 mm or more, 22 mm or more, 23 mm or more, 24 mm or more, 25 mm or more, 26 mm or more, 27 mm or more, 28 mm or more, or 29 mm or more. The above distance may be 75 mm or less, 70 mm or less, 65 mm or less, 60 mm or less, 55 mm or less, 50 mm or less, 49 mm or less, 48 mm or less, or 47 mm or less. The above distance may be within the range of 20 mm to 65 mm, specifically within the range of 25 mm to 55 mm, or more specifically within the range of 29 mm to 47 mm. The distance between the area where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) may decrease and then increase. As previously mentioned, the thickness of the copper foil wound on the second body (120) may increase. The distance between the area where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) may decrease and then increase as the thickness of the copper foil increases.
[0065] Referring to FIGS. 2 to 4, the appearance of the copper foil being wound on the outer surface of the second body (120) will be explained. Specifically, FIGS. 2 to 4 are flowcharts showing the appearance of the copper foil being wound in chronological order.
[0066] The total diameter of the copper foil wound on the second body (120) and the copper foil wound on the second body (120) will increase as the copper foil is wound. First, referring to FIG. 2, the angle (G1) at which the virtual first line (B1) connecting the area where the third body (130) presses the copper foil and the second axis (121), and the virtual second line (B2) connecting the area where the copper foil wound from the first body (110) meets the copper foil wound on the second body (120) and the second axis (121) may be in the range of 18 to 20 degrees. Additionally, the distance between the area where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) may be in the range of 45.00 mm to 50.00 mm.
[0067] Referring to FIG. 3, as the copper foil is wound, the third body (130) can rotate around the fourth body (140) as an axis. At this time, the third body (130) can move in a direction that approaches the first body (110). Comparing FIG. 2 and FIG. 3, it is confirmed that the total diameter of the second body (120) and the copper foil wound on the second body (120) increases as the copper foil is wound. Additionally, the angle (G2) at which the virtual first line (B1) connecting the area where the third body (130) presses the copper foil and the second axis (121), and the virtual second line (B2) connecting the area where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) and the second axis (121) meet may be within the range of 6.00 degrees to 8.00 degrees. The distance between the area where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) may be within the range of 25.00 mm to 33.00 mm.
[0068] Comparing FIG. 3 and FIG. 4, it is confirmed that the total diameter of the copper foil wound on the second body (120) and the copper foil wound on the second body (120) increases as the copper foil is wound. Additionally, the angle (G3) at which the virtual first line (B1) connecting the area where the third body (130) presses the copper foil and the second axis (121), and the virtual second line (B2) connecting the area where the copper foil wound from the first body (110) meets the copper foil wound on the second body (120) and the second axis (121) meet may be within the range of 5.00 to 6.00 degrees. The distance between the area where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) may be in the range of 33.00 mm to 38.00 mm.
[0069] Ultimately, the angle at which a virtual first line (B1) connecting the area where the third body (130) presses the copper foil and the second axis (121), and a virtual second line (B2) connecting the area where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) and the second axis (121) gradually decreases as the copper foil is wound, while the distance between the area where the third body (130) presses the copper foil and the area (A2) where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) can decrease and then increase. Through this, a copper foil of excellent quality can be manufactured.
[0070] The first body (110) may be configured to be movable in a direction closer to or further away from the second body (120). When the first body (110) moves closer to the second body (120), a stronger pressure may be applied to the copper foil. Additionally, the position of the area where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) may change. Referring to FIG. 5, the first body (110) may move toward the upper or lower direction.
[0071] The distance between the third body (130) and the fourth body (140) can be adjusted within a certain range. The fourth body (140) may include an axis. In this specification, the axis included in the fourth body (140) may be defined as the fourth axis. The distance between the third body (130) and the fourth body (140) may be measured as the straight-line distance between the third axis and the fourth axis. The distance between the third body (130) and the fourth body (140) may be within the range of 500 mm to 700 mm. Specifically, the distance between the third body (130) and the fourth body (140) may be 510 mm or more, 520 mm or more, 530 mm or more, 540 mm or more, 550 mm or more, 560 mm or more, 570 mm or more, or 580 mm or more, and may be 690 mm or less, 680 mm or less, 670 mm or less, 660 mm or less, 650 mm or less, 640 mm or less, 630 mm or less, 620 mm or less, 610 mm or less, or 600 mm or less.
[0072] The distance between the third body (130) and the fourth body (140), and the position of the first body (110) are controlled so that the angle at which the virtual first line (B1) connecting the area where the third body (130) presses the copper foil and the second axis (121), and the virtual second line (B2) connecting the area where the copper foil unwound from the first body (110) meets the copper foil wound on the second body (120) and the second axis (121) can be adjusted. However, it is obvious that other elements such as the position of the second body (120), as well as the distance between the third body (130) and the fourth body (140) and the position of the first body (110), can also be controlled together.
[0073] FIG. 6 illustrates wrinkles formed on the surface of a copper foil, and FIG. 7 illustrates a copper foil manufactured by the copper foil winding device of the present invention.
[0074] Referring to FIG. 6, wrinkles formed on the surface of the copper foil are observed. If the tension is excessive or the winding surface is uneven during the winding of the copper foil, defects such as wrinkles, bubbles, and tears may be formed in the copper foil. Referring to FIG. 7, it is observed that no defects are formed in the copper foil manufactured by the copper foil winding device according to one embodiment of the present invention. The present disclosure may be modified and implemented in various forms, and the scope of rights is not limited to the embodiments described above. The above description is merely an example of applying the principles of the present disclosure, and other configurations may be further included within the scope of the present invention.
[0075] Explanation of drawing symbols
[0076] 10: Copper foil winding device
[0077] 110: 1st body
[0078] 111: 1st axis
[0079] 120: 2nd body 121: 2nd shaft
[0080] 130: 3rd body 140: 4th body 200: Extension part
[0081] B1: Imaginary first line B2: Imaginary second line
Claims
[CLAIMS]
1. The first body that rotates around the first bamboo and winds the copper foil; A second body that rotates around the second body and winds the copper foil, which is wound from the first body, onto its outer surface; A third body positioned to press a copper foil wound on the outer surface of the second body; a fourth body positioned according to the positioning direction of the third body; and Includes an extension part that connects both ends of the third body and the fourth body, respectively; A copper foil winding device in which the angle at which a virtual first line connecting the area where the third body presses the copper foil and the second axis, and a virtual second line connecting the area where the copper foil unwound from the first body meets the copper foil wound on the second body and the second axis meets is within the range of 1 degree to 30 degrees.
2. In Paragraph 1, A copper foil winding device formed such that the area where the third body presses the copper foil along the rotational direction of the second body is positioned behind the area where the copper foil unwound from the first body meets the copper foil wound on the second body.
3. In Paragraph 1, The first body is a copper foil winding device that rotates in the opposite direction to the second body.
4. In Article 1, A copper foil winding device in which the copper foil is unwound from the lower side of the first body and wound from the upper side of the second body.
5. In Paragraph 1, A copper foil winding device in which the angle at which a virtual first line connecting the area where the third body presses the copper foil and the second axis, and a virtual second line connecting the area where the copper foil unwound from the first body meets the copper foil wound on the second body and the second axis meets is within the range of 5 to 18 degrees.
6. In Paragraph 5, A copper foil winding device in which a virtual first line connecting the area where the third body presses the copper foil and the second axis, and a virtual second line connecting the area where the copper foil unwound from the first body meets the copper foil wound on the second body, gradually decreases as the copper foil is wound on the second body.
7. In Paragraph 1, A copper foil winding device in which the distance between the area where the third body presses the copper foil and the area where the copper foil unwound from the first body meets the copper foil wound on the second body decreases and then increases as the copper foil is wound on the second body.
8. A copper foil winding device according to claim 1, wherein the distance between the area where the third body presses the copper foil and the area where the copper foil unwound from the first body meets the copper foil wound on the second body is within the range of 20 mm to 80 mm.
9. In Paragraph 1, The first body, the second body, the third body, and the fourth body are each arranged side by side as a copper foil winding device.
10. In Paragraph 1, A copper foil winding device wherein the first body is configured to be movable in a direction closer to or further away from the second body.
11. In Paragraph 1, The above third body is a copper foil winding device rotatably configured around the above fourth body as an axis.
12. In Paragraph 1, The above third body is a copper foil winding device that presses the copper foil by its own weight.