A release film wrapping method for composite structure carbon fiber tube

Abstract

The present invention provides a release film wrapping method for a composite structure carbon fiber tube, the release film wrapping method comprising: wrapping a carbon fiber cloth around a mold core, and applying the release film tape to the outer side of the carbon fiber cloth by wrapping; the mold core has a structure of straight tubes at both ends and a truncated cone-shaped tube in the middle. By limiting the synergistic relationship between the wrapping line speed of the release film tape and the wrapping tension, and controlling the feed speed within a certain range, the carbon fiber tube of a specific composite structure is effectively wrapped, reducing the fluctuation of the wrapping, avoiding the breakage of the release film tape during the subsequent curing step, and avoiding the presence of release film residue when the OPP release film tape is subsequently removed, effectively ensuring the uniformity of the appearance texture of the composite structure carbon fiber tube, improving the product quality of the composite structure carbon fiber tube, and reducing the product scrap rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon fiber tubes, and in particular relates to a release film wrapping method for a composite structure carbon fiber tube. Background Art

[0002] Carbon fiber is a specialized fiber composed of carbon. It is fibrous, flexible, and can be processed into various fabrics. Because its graphite microcrystal structure is preferentially oriented along the fiber axis, it exhibits high strength and modulus along the fiber axis, resulting in excellent tensile properties. Carbon fiber has been applied in various fields, particularly in pipes made from carbon fiber, which are characterized by their durability, elasticity, and toughness, and are therefore widely used.

[0003] Robotic arms are the most widely used automated mechanical devices in robotics. Although they vary in form, they all share a common characteristic: they receive commands and precisely locate a point in three-dimensional (or two-dimensional) space to perform their work. Robotic arms generally perform three types of movements: telescoping, rotation, and lifting. Rotation and lifting are accomplished by a cross arm and a column. The arm's primary function is to move the gripper to the desired position and to support the maximum weight of the gripper's workpiece, as well as the arm's own weight. Furthermore, depending on the robot's movement and operational requirements, piping, cooling systems, travel positioning devices, and automatic detection devices are typically installed on the arm. Therefore, the arm's structure, working range, load-bearing capacity, and movement accuracy directly impact the overall performance of the entire machine. Carbon fiber support arms offer several advantages: lightweight, flexible and accurate operation; high strength; excellent temperature resistance; and a favorable price-performance ratio.

[0004] Release film, also known as peeling film, isolating film, or separating film, is typically applied to the surface of plastic films (such as PET, PE, and OPP) to enhance their release strength. This is achieved by plasma treatment, fluorine coating, or silicone release agent coating. This allows for extremely light and stable release from various organic pressure-sensitive adhesives (such as hot melt adhesives, acrylic adhesives, and rubber-based pressure-sensitive adhesives). Due to its advantages in isolation, filling, protection, and ease of peeling, release films are widely used in various electronics, communications, and machinery industries.

[0005] OPP release film is also known as biaxially oriented polypropylene film. Its main raw material is polypropylene. The film is processed by biaxial stretching using a flat die method. It has the advantages of strong tensile strength, excellent gloss and transparency.

[0006] Currently, carbon fiber tubes are commonly used in semiconductor handling arms. The preparation method of carbon fiber tubes mainly includes: coating a release agent and / or applying a release film on a mold core, wrapping a carbon fiber prepreg on the treated mold core surface, and applying a release film to the outside of the carbon fiber prepreg. After curing and molding, the mold core is removed and the outermost layer of release film is removed. However, currently, the entire release film is usually applied to the outside of the carbon fiber prepreg, which can easily lead to uneven texture of the carbon fiber tube, abnormal protrusions, and even the problem of residual release film when the outermost layer of release film is removed.

[0007] Therefore, there is an urgent need to provide a release film wrapping method for a composite structure carbon fiber tube. Summary of the Invention

[0008] The object of the present invention is to provide a release film wrapping method for a composite structure carbon fiber tube. By limiting the synergistic relationship between the wrapping linear speed of the release film tape and the wrapping tension and controlling the feed speed within a certain range, the carbon fiber tube of a specific composite structure can be effectively coated with good coating effect and can reduce the fluctuation of the wrapping.

[0009] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0010] The present invention provides a release film wrapping method for a composite structure carbon fiber tube, the release film wrapping method comprising: wrapping a carbon fiber cloth on a mold core, and applying a release film tape to the outer side of the carbon fiber cloth by wrapping;

[0011] The structure of the mold core is a straight tube at both ends and a truncated cone tube in the middle;

[0012] The wrapping method is as follows: the release film tape is applied to within 80% of the length of the straight tube at a first wrapping line speed and a first wrapping tension, and then the release film tape is applied to within 50% of the length of the truncated cone tube at a second wrapping line speed and a second wrapping tension, and the remaining part is wrapped using a third wrapping line speed and a third wrapping tension.

[0013] The release mold of the present invention is preferably an OPP release film, which can achieve better demolding and core-releasing effects compared to existing PET release films and PE release films.

[0014] The release film wrapping method provided by the present invention adopts segmented wrapping linear speed and wrapping tension, and by limiting the synergistic relationship between the wrapping linear speed and wrapping tension of the release film tape, it is targeted at specific composite structure carbon fiber tubes, so that the coating effect is good, the fluctuation of the wrapping is reduced, the uniformity of the appearance texture of the composite structure carbon fiber tube is effectively ensured, the product quality of the composite structure carbon fiber tube is improved, and the product scrap rate is reduced.

[0015] As a preferred technical solution of the present invention, the diameter of the straight tube at one end is 24-26 mm, for example, it can be 24 mm, 24.4 mm, 24.8 mm, 25 mm, 25.4 mm, 25.8 mm or 26 mm, and the length is 950-1050 mm, for example, 950 mm, 960 mm, 980 mm, 1000 mm, 1020 mm, 1040 mm or 1050 mm, but is not limited to the listed values, and other unlisted values ​​within the above numerical range are also applicable.

[0016] Preferably, the diameter of the straight tube at the other end is 10-12 mm, for example, it can be 10 mm, 10.4 mm, 10.8 mm, 11 mm, 11.4 mm, 11.8 mm or 12 mm, and the length is 25-28 mm, for example, 25 mm, 25.5 mm, 26 mm, 26.5 mm, 27 mm, 27.5 mm or 28 mm, but is not limited to the listed values. Other values ​​not listed within the above numerical range are also applicable.

[0017] Preferably, the length of the truncated cone tube is 950-1000 mm, for example, it can be 950 mm, 960 mm, 970 mm, 980 mm, 990 mm or 1000 mm, etc., but is not limited to the listed values. Other values ​​not listed within the above numerical range are also applicable.

[0018] As a preferred technical solution of the present invention, the release film tape is sequentially applied from one end of a straight tube with a diameter of 24-26 mm to one end of a straight tube with a diameter of 10-12 mm in a wrapping manner.

[0019] As a preferred technical solution of the present invention, the first winding linear speed is 2300-2400rpm, for example, it can be 2300rpm, 2320rpm, 2340rpm, 2360rpm, 2380rpm or 2400rpm, etc., but it is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0020] In the present invention, by limiting the winding speed of the release film tape, the problem of OPP tape residue after subsequent tape stripping can be avoided when the winding speed is too fast. It can also be avoided that when the winding speed is too slow, abnormal resin accumulation and protrusions can be prevented at the surface texture of the composite structure carbon fiber tube.

[0021] Preferably, the first strap tension is 4.1-4.3 kg, for example, 4.1 kg, 4.14 kg, 4.18 kg, 4.2 kg, 4.24 kg, 4.28 kg or 4.3 kg, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] The present invention limits the specific relationship between the wrapping linear speed and the wrapping tension of the release film tape, so that the release film has a good coating effect without wrinkles or gaps.

[0023] As a preferred technical solution of the present invention, the second winding linear speed is 1800-2000rpm, for example, it can be 1800rpm, 1840rpm, 1890rpm, 1900rpm, 1940rpm, 1980rpm or 2000rpm, etc., but is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0024] Preferably, the second strapping tension is 4.5-4.75 kg, for example, 4.5 kg, 4.55 kg, 4.6 kg, 4.65 kg, 4.7 kg or 4.75 kg, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0025] As a preferred technical solution of the present invention, the third winding linear speed is 2800-3000rpm, for example, it can be 2800rpm, 2840rpm, 2890rpm, 2900rpm, 2940rpm, 2980rpm or 3000rpm, etc., but it is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0026] Preferably, the third strapping tension is 3.8-4 kg, for example, 3.8 kg, 3.84 kg, 3.88 kg, 3.9 kg, 3.94 kg, 3.98 kg or 4 kg, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0027] In the present invention, by controlling the third tape winding line speed > the first tape winding line speed > the second tape winding line speed and the second tape winding tension > the first tape winding tension > the third tape winding tension, and limiting the synergistic relationship between the tape winding line speed and the tape winding tension of the release film tape, the carbon fiber tube of a specific combination structure can be effectively coated, the coating effect is good, the fluctuation of the tape winding is reduced, and the release film residue is avoided when the OPP release film tape is subsequently removed, the uniformity of the appearance texture of the carbon fiber tube of the combination structure is effectively guaranteed, the product quality of the carbon fiber tube of the combination structure is improved, and the product scrap rate is reduced.

[0028] As a preferred technical solution of the present invention, the feeding speed of the release film tape is 7-13 mm / s, for example, it can be 7 mm / s, 10 mm / s, 11 mm / s, 12 mm / s or 13 mm / s, etc., but it is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0029] By limiting the feeding speed of the release film tape, the present invention can prevent the feeding speed of the tape from being too fast, thereby avoiding the problem of the release film tape breaking during the subsequent curing process of the OPP release film, and can also prevent the feeding speed of the tape from being too slow, thereby avoiding the problem of poor or no texture on the appearance of the composite structure carbon fiber tube.

[0030] As a preferred technical solution of the present invention, the width of the release film tape is 10-12 mm, for example, it can be 10 mm, 10.4 mm, 10.8 mm, 11 mm, 11.4 mm, 11.8 mm or 12 mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this numerical range are also applicable, preferably 10 mm.

[0031] As a preferred technical solution of the present invention, the distance between adjacent release film tapes is 1.5-2.5 mm, for example, it can be 1.5 mm, 1.7 mm, 1.9 mm, 2.0 mm, 2.2 mm, 2.4 mm or 2.5 mm, etc., but it is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0032] In the present invention, the release film wrapping method uses release film tapes of equal width, and the mold core corresponding to the entire tape to be wrapped is a straight tube + truncated cone combination mold core. The mold core rotates along the axis to drive the release film tape to be wound; at the same time, the tape distance between adjacent release film tapes is controlled within a certain range to avoid OPP tape residue during reverse stripping and uneven product texture.

[0033] As a preferred technical solution of the present invention, the release film wrapping method includes: wrapping a carbon fiber cloth on a mold core, and applying a release film tape to the outside of the carbon fiber cloth by wrapping;

[0034] The structure of the mold core is a straight tube at both ends and a truncated cone tube in the middle; the diameter of the straight tube at one end is 24-26 mm and the length is 950-1050 mm; the diameter of the straight tube at the other end is 10-12 mm and the length is 25-28 mm; the length of the truncated cone tube is 950-1000 mm;

[0035] The release film tape is sequentially applied from one end of a straight tube with a diameter of 24-26 mm to the other end of a straight tube with a diameter of 10-12 mm by winding; the release film tape is applied to within 80% of the length of the straight tube with a diameter of 24-26 mm at a first winding line speed of 2300-2400 rpm and a first winding tension of 4.1-4.3 kg, and then the release film tape is applied to within 50% of the length of the truncated cone tube at a second winding line speed of 1800-2000 rpm and a second winding tension of 4.5-4.75 kg, and the remaining part is applied at a third winding line speed of 2800-3000 rpm and a third winding tension of 3.8-4 kg; the winding feed speed of the release film tape is 7-13 mm / s.

[0036] The numerical range described in the present invention includes not only the point values ​​listed above, but also any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The release film wrapping method of the present invention can effectively coat carbon fiber tubes with specific composite structures by limiting the coordinated relationship between the wrapping linear speed and the wrapping tension of the release film tape and controlling the feed speed within a certain range, thereby reducing the fluctuation of the wrapping, avoiding the breakage of the release film tape in the subsequent curing step, and avoiding the release film residue when the OPP release film tape is subsequently removed, effectively ensuring the uniformity of the appearance texture of the composite structure carbon fiber tube, improving the product quality of the composite structure carbon fiber tube, and reducing the product scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the modular mold core used in Example 1 of the present invention;

[0040] Among them, 1-straight tube; 2-truncated cone tube, 3-straight tube. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0042] The present invention adopts the method disclosed in the prior art to first coat the iron core with a release agent, then wrap it with 8 layers of fiber cloth, and then apply a release film using the release film wrapping method described in the following examples and comparative examples. After that, curing and molding are carried out according to the method disclosed in the prior art, the mold core is removed, and the release film is removed by reverse stripping.

[0043] The release films used in the following examples and comparative examples of the present invention are all OPP release films.

[0044] Example 1

[0045] This embodiment provides a release film wrapping method for a composite structure carbon fiber tube. The structure of the mold core is a straight tube at both ends and a truncated cone tube in the middle. The structural diagram is as follows: Figure 1 As shown; the diameter of the straight tube 3 at one end is 24.92mm and the length is 1000mm; the diameter of the straight tube 1 at the other end is 10.92mm and the length is 26mm; the length of the truncated cone tube 2 is 964mm.

[0046] The release film wrapping method includes: using a wrapping method to wrap a release film tape with a width of 10 mm on the outside of the carbon fiber cloth; the release film tape is sequentially wrapped from one end of a straight tube with a diameter of 24.92 mm to the other end of a straight tube with a diameter of 10.92 mm by wrapping; the release film tape is wrapped to 80% of the length of the straight tube with a diameter of 24.92 mm at a first wrapping line speed of 2350 rpm and a first wrapping tension of 4.2 kg, and then the release film tape is wrapped to 50% of the length of the truncated cone-shaped tube at a second wrapping line speed of 1900 rpm and a second wrapping tension of 4.6 kg, and the remaining part is wrapped at a third wrapping line speed of 2900 rpm and a third wrapping tension of 3.9 kg; the wrapping feed speed of the release film tape is 10 mm / s; and the tape distance between adjacent release film tapes is 2 mm.

[0047] Example 2

[0048] This embodiment provides a release film wrapping method for a composite structure carbon fiber tube. The structure of the mold core is a straight tube at both ends and a truncated cone tube in the middle. The straight tube at one end has a diameter of 24 mm and a length of 950 mm; the straight tube at the other end has a diameter of 10 mm and a length of 25 mm; the truncated cone tube is 964 mm long.

[0049] The release film wrapping method includes: using a wrapping method to wrap a release film tape with a width of 12 mm on the outside of the carbon fiber cloth; the release film tape is sequentially wrapped from one end of a straight tube with a diameter of 24 mm to one end of a straight tube with a diameter of 10 mm by wrapping; the release film tape is wrapped to 70% of the length of the straight tube with a diameter of 24 mm at a first wrapping line speed of 2300 rpm and a first wrapping tension of 4.1 kg, and then the release film tape is wrapped to 40% of the length of the truncated cone tube at a second wrapping line speed of 1800 rpm and a second wrapping tension of 4.5 kg, and the remaining part is wrapped at a third wrapping line speed of 2800 rpm and a third wrapping tension of 3.8 kg; the wrapping feed speed of the release film tape is 8 mm / s; and the tape distance between adjacent release film tapes is 2 mm.

[0050] Example 3

[0051] This embodiment provides a release film wrapping method for a composite carbon fiber tube. The mold core has a structure of straight tubes at both ends and a truncated cone-shaped tube in the middle. The straight tube at one end has a diameter of 26 mm and a length of 1050 mm. The straight tube at the other end has a diameter of 12 mm and a length of 28 mm. The truncated cone-shaped tube is 960 mm long.

[0052] The release film wrapping method includes: using a wrapping method to wrap a release film tape with a width of 11 mm on the outside of the carbon fiber cloth; the release film tape is sequentially wrapped from one end of a straight tube with a diameter of 246 mm to one end of a straight tube with a diameter of 12 mm by wrapping; the release film tape is wrapped to 75% of the length of the straight tube with a diameter of 26 mm at a first wrapping line speed of 2400 rpm and a first wrapping tension of 4.3 kg, and then the release film tape is wrapped to 45% of the length of the truncated cone tube at a second wrapping line speed of 2000 rpm and a second wrapping tension of 4.75 kg, and the remaining part is wrapped at a third wrapping line speed of 3000 rpm and a third wrapping tension of 4 kg; the wrapping feed speed of the release film tape is 12 mm / s; and the tape distance between adjacent release film tapes is 2 mm.

[0053] Example 4

[0054] This embodiment provides a release film wrapping method for a composite structure carbon fiber tube, which is the same as that of Example 1 except that the first wrapping linear speed is 2700 rpm.

[0055] Example 5

[0056] This embodiment provides a release film wrapping method for a composite structure carbon fiber tube, which is the same as that of embodiment 1 except that the first wrapping linear speed is 2000 rpm.

[0057] Example 6

[0058] This embodiment provides a release film wrapping method for a composite structure carbon fiber tube, which is the same as that of embodiment 1 except that the distance between adjacent release film tapes is 1 mm.

[0059] Example 7

[0060] This embodiment provides a release film wrapping method for a composite structure carbon fiber tube, which is the same as that of embodiment 1 except that the distance between adjacent release film tapes is 4 mm.

[0061] Comparative Example 1

[0062] This comparative example provides a release film wrapping method for a composite structure carbon fiber tube. Except that the first to third wrapping line speeds are all 1900 rpm and the first to third wrapping tensions are all 4.6 kg, other conditions are the same as those in Example 1.

[0063] Comparative Example 2

[0064] This comparative example provides a release film wrapping method for a composite structure carbon fiber tube. Except that the first wrapping linear speed and the second wrapping linear speed are both 2350 rpm and the first wrapping tension and the second wrapping tension are both 4.2 kg, other conditions are the same as those in Example 1.

[0065] Comparative Example 3

[0066] This comparative example provides a release film wrapping method for a composite structure carbon fiber tube, which adopts the existing technology to coat the entire release film.

[0067] The results of product appearance and scrap rate obtained in the above examples and comparative examples are shown in Table 1.

[0068] Table 1

[0069]

[0070] The applicant declares that the present invention is not limited to the above-described detailed structural features through the above-described embodiments, and does not necessarily rely on the above-described detailed structural features for implementation. Those skilled in the art should understand that any improvements to the present invention, equivalent replacements for selected components, additions of auxiliary components, and selection of specific embodiments, etc., fall within the scope of protection and disclosure of the present invention.

[0071] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0072] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0073] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for wrapping a release film around a composite structure carbon fiber tube, characterized in that: The release film wrapping method comprises: wrapping a carbon fiber cloth on a mold core, and applying a release film tape to the outside of the carbon fiber cloth by wrapping; The structure of the mold core is a straight tube at both ends and a truncated cone tube in the middle; The wrapping method comprises: applying the release film tape to within 80% of the length of the straight tube at a first wrapping speed and a first wrapping force, then applying the release film tape to within 50% of the length of the truncated cone tube at a second wrapping speed and a second wrapping force, and applying the remaining portion at a third wrapping speed and a third wrapping force; The first tape winding linear speed is 2300-2400 rpm; the first tape winding tension is 4.1-4.3 kg; The second tape winding linear speed is 1800-2000 rpm; the second tape winding tension is 4.5-4.75 kg; The third tape winding linear speed is 2800-3000 rpm; the third tape winding tension is 3.8-4 kg.

2. The release film wrapping method according to claim 1, wherein: The straight tube at one end has a diameter of 24-26 mm and a length of 950-1050 mm.

3. The release film wrapping method according to claim 1, wherein: The straight tube at the other end has a diameter of 10-12 mm and a length of 25-28 mm.

4. The release film wrapping method according to claim 1, wherein: The length of the truncated cone tube is 950-1000 mm.

5. The release film wrapping method according to claim 1, wherein: The release film tape is sequentially applied from one end of a straight tube with a diameter of 24-26 mm to one end of a straight tube with a diameter of 10-12 mm in a wrapping manner.

6. The release film wrapping method according to claim 1, wherein: The release film tape has a feeding speed of 7-13 mm / s.

7. The release film wrapping method according to claim 1, wherein: The width of the release film tape is 10-12 mm.

8. The release film wrapping method according to claim 7, characterized in that: The width of the release film tape is 10 mm.

9. The release film wrapping method according to claim 1, wherein: The distance between adjacent release film tapes is 1.5-2.5 mm.

10. The release film wrapping method according to claim 1, wherein: The release film wrapping method comprises: wrapping a carbon fiber cloth on a mold core, and applying a release film tape to the outside of the carbon fiber cloth by wrapping; The structure of the mold core is a straight tube at both ends and a truncated cone tube in the middle; the diameter of the straight tube at one end is 24-26 mm and the length is 950-1050 mm; the diameter of the straight tube at the other end is 10-12 mm and the length is 25-28 mm; the length of the truncated cone tube is 950-1000 mm; The release film tape is sequentially applied from one end of a straight tube with a diameter of 24-26 mm to the other end of a straight tube with a diameter of 10-12 mm by winding; the release film tape is applied to within 80% of the length of the straight tube with a diameter of 24-26 mm at a first winding line speed of 2300-2400 rpm and a first winding tension of 4.1-4.3 kg, and then the release film tape is applied to within 50% of the length of the truncated cone tube at a second winding line speed of 1800-2000 rpm and a second winding tension of 4.5-4.75 kg, and the remaining part is applied at a third winding line speed of 2800-3000 rpm and a third winding tension of 3.8-4 kg; the winding feed speed of the release film tape is 7-13 mm / s.

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