Watch grain and watchband

Abstract

The utility model discloses a watch grain and a watchband. The surface particle comprises a composite structure, and a heat exchange channel communicated with the external environment is arranged in the composite structure. In this way, the weight of the surface particles can be reduced, and the heat exchange performance of the surface particles can be improved.

Description

Technical Field

[0001] This application relates to the field of portable product component technology, and in particular to a watch grain and watch strap. Background Technology

[0002] As living standards continue to improve, users are demanding higher levels of comfort from portable products. Watch links are a crucial component of watch straps. When worn, they come into contact with the user, covering their skin and reducing heat dissipation, which can cause discomfort. Utility Model Content

[0003] To address the aforementioned technical problems, this application proposes a surface granule and a surface belt to reduce the weight of the surface granule and improve its heat exchange performance.

[0004] This application proposes a surface particle, including a composite structure, wherein the composite structure has a heat exchange channel communicating with the external environment.

[0005] This application proposes a watch strap comprising a plurality of watch beads connected in sequence, wherein the watch beads are as described above.

[0006] The beneficial effect of this application's technical solution is that the surface particles provided in this application include a composite structure, and the composite structure has a heat exchange channel communicating with the external environment. This embodiment can reduce the weight of the surface particles, and through the heat exchange channel, it can improve the heat exchange performance of the surface particles, thereby enhancing the user experience. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0008] Figure 1 This is a schematic diagram of the layered structure of one embodiment of the composite structure of this application;

[0009] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the composite structure of this application;

[0010] Figure 3 This is a cross-sectional structural schematic diagram of another embodiment of the composite structure of this application;

[0011] Figure 4 This is a schematic diagram of the layered structure of another embodiment of the composite structure of this application;

[0012] Figure 5 This is a schematic diagram of the layered structure of another embodiment of the composite structure of this application;

[0013] Figure 6 This is a three-dimensional structural schematic diagram of one embodiment of the present application.

[0014] Figure 7 yes Figure 6 A schematic diagram of the structure of the semi-finished product during the processing of the granules in the example embodiment;

[0015] Figure 8 This is a three-dimensional structural schematic diagram of another embodiment of the granules in this application;

[0016] Figure 9 yes Figure 8 Another side view of the surface particles in the embodiment;

[0017] Figure 10 yes Figure 8 Cross-sectional view of the granules in the embodiment;

[0018] Figure 11 This application contains a schematic diagram of the structure of one embodiment;

[0019] Figure 12 This is a schematic diagram of the layered structure of another embodiment of the composite structure of this application;

[0020] Figure 13 This is a schematic diagram of a layered structure, representing another embodiment of the composite structure of this application. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0022] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0023] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0025] Single carbon fiber structures are lightweight and have high tensile strength, making them suitable as raw materials for components in portable products. Since most single carbon fiber structures use adhesives containing only carbon fiber, they are also relatively easy to machine.

[0026] In the existing technology, the manufacturing process of carbon fiber watch straps includes: stacking multiple carbon fiber sheets to form a carbon fiber plate, bonding the carbon fiber sheets together with an adhesive, and forming an adhesive layer between adjacent carbon fiber sheets; then cutting the carbon fiber plate into watch grain shapes.

[0027] In applications where surface particles are interconnected to form a strap, they are prone to breakage when subjected to tensile forces, particularly those in a plane aligned with the fiber orientation of the carbon fiber sheet (or lateral tensile forces). The inventors of this application have discovered that this breakage occurs because, under lateral tensile forces, the adhesive layer between the carbon fiber layers in the surface particle's matrix layer is prone to fracture, causing interlayer slippage and ultimately leading to breakage. This is because the tensile strength of the adhesive layer is lower than the tensile strength of the carbon fiber.

[0028] To address the aforementioned issues, this application proposes a composite structure, surface particles, a watchband, a method for preparing the composite structure, and a method for preparing the surface particles, in order to improve the fracture resistance and tensile strength of the composite structure, surface particles, and watchband.

[0029] First, this application proposes a composite structure, such as Figure 1 , Figure 2 , Figure 3 As shown, Figure 1 This is a schematic diagram of the layered structure of one embodiment of the composite structure of this application. Figure 2 This is a cross-sectional structural schematic diagram of one embodiment of the composite structure of this application. Figure 3 This is a cross-sectional schematic diagram of another embodiment of the composite structure of this application. The composite structure 100 can be used for surface particles or other structures; this application uses surface particles as an example for description. The composite structure 100 includes a matrix layer 10 and a first protective layer 20 wound around the outside of the matrix layer 10. The first protective layer 20 may include a fiber layer wound around the outside of the matrix layer 10. The fiber layer is tightly wound around the matrix layer 10. In one embodiment, the fiber layer can be wound by weaving around the periphery of the matrix layer 10, or by wrapping the fiber layer around the periphery of the matrix layer 10. The first protective layer 20 and the matrix layer 10 can be bonded together with an adhesive. The fiber orientation of the fiber layer is circumferential or similar to circumferential around the periphery of the matrix layer 10. For example, if the cross-section of the matrix layer 10 is circular or elliptical, the fiber orientation of the fiber layer is circumferential around the matrix layer 10. In other embodiments, the cross-section of the matrix layer 10 may also be rectangular or other polygonal, and the first protective layer 20 may be composed of fibers surrounding the matrix layer 10 of this shape, forming a first protective layer 20 surrounding the outer surface of the matrix layer 10. The fiber orientation of the first protective layer 20 and the fiber orientation of the matrix layer 10 form an angle. The present invention does not limit the number of carbon fiber layers in the first protective layer 20; it can be a single fiber layer or multiple fiber layers stacked together; the multiple fiber layers can be bonded together with adhesives.

[0030] The first protective layer 20 may include a first carbon fiber layer 22 surrounding the outer side of the substrate layer 10. The fiber orientation x of the first carbon fiber layer 22, as described above, may be a circumferential or approximately circumferential direction surrounding the outer surface of the substrate layer 10, depending on the shape of the substrate layer 10.

[0031] In one embodiment, the first carbon fiber layer 22 may include only one type of carbon fiber with a single fiber orientation, formed by winding and bundling the aforementioned carbon fibers; in another embodiment, the first carbon fiber layer 22 may also include at least two types of carbon fiber layers woven together, that is, it may include carbon fibers with two fiber orientations, or carbon fibers with three or more fiber orientations; details will not be elaborated here.

[0032] The circumferential direction of the substrate layer 10 can refer to the circumferential direction of the outer surface of the substrate layer 10.

[0033] The first protective layer 20 described above has a circumferential fiber orientation, which can improve the tensile strength of the matrix layer 10. Taking a carbon fiber matrix as an example, in one embodiment, the matrix layer 10 is formed by a bundle of carbon fibers with the same fiber orientation, including carbon fibers with one fiber orientation. The carbon fibers are bonded together by an adhesive, which forms an adhesive layer. In another embodiment, the matrix layer 10 is formed by horizontally stacking multiple layers of carbon fibers. When a tensile force is applied to it along the fiber orientation direction of the carbon fiber layers, since the circumferential first protective layer 20 surrounds the periphery of the matrix layer 10, the overall tensile strength of the material is strengthened by the fibers of the first protective layer 20. This protects the matrix layer 10 from interlayer slippage when subjected to tensile force in the aforementioned direction, so that the material fracture is related to the fiber strength of the first protective layer 20, rather than determined by the structural strength of the interlayer adhesive layer of the matrix layer 10.

[0034] In this embodiment, the fiber orientation x of the first carbon fiber layer 22 of the first protective layer 20 disposed on the outside of the matrix layer 10 is an annular or approximately circumferential direction surrounding the outer surface of the matrix layer 10. This can increase the tensile strength of the composite structure 100 along the circumferential or approximately circumferential direction of the matrix layer 10, thereby improving the strength of the composite structure 100, increasing its toughness, and enhancing its fracture resistance.

[0035] In some embodiments, the fiber orientation of the carbon fiber layer in the matrix layer 10 is a first direction z, and the circumferential or approximately circumferential direction of the matrix layer 10 refers to the circumferential or approximately circumferential direction of the fiber orientation of the carbon fiber layer in the matrix layer 10.

[0036] In some embodiments, the matrix layer 10 includes a second carbon fiber layer 12, the fiber orientation of the second carbon fiber layer 12 being a first direction z, and the angle between the first direction z and the fiber orientation of the first carbon fiber layer 22 being 10° to 90°. In this embodiment, when the composite structure 100 is subjected to a force in a direction with an angle of 10° to 90° with the fiber orientation of the second carbon fiber layer 12, the presence of the first carbon fiber layer 22 located outside the second carbon fiber layer 12 can improve the problem of slippage of the second carbon fiber layer 12 under force in the matrix layer 10. Furthermore, since the second carbon fiber layer 12 itself has high resistance strength along the first direction z, this embodiment can improve the resistance strength of the composite structure 100, resulting in higher toughness and higher fracture resistance.

[0037] In some embodiments, the second carbon fiber layer 12 may be formed by traction and bundling of carbon fibers with the same fiber orientation, with the carbon fibers bonded together by an adhesive to form an adhesive layer; in some embodiments, the second carbon fiber layer 12 may include multiple carbon fiber layers stacked together; the multiple carbon fiber layers are connected by an adhesive layer. In the multiple carbon fiber layers, the fiber orientation of the carbon fibers in different layers may be the same or different; the carbon fibers belonging to the same layer may also be woven from carbon fibers with different fiber orientations. In some embodiments, the adhesive may be epoxy resin.

[0038] In some embodiments, the included angle can be 10°, 20°, 30°, 45°, 60°, 80°, 90°, etc.

[0039] In some embodiments, the matrix layer 10 includes multiple layers of second carbon fiber 12; and / or, the first protective layer 20 includes multiple layers of first carbon fiber 22. This structure further enhances the strength, toughness, and fracture resistance of the composite structure 100.

[0040] In some embodiments, carbon fiber is a fiber with a carbon content between 85% and 99%, obtained from raw materials such as polyacrylonitrile fiber, pitch fiber, or viscose fiber through processes such as pre-oxidation and carbonization. When the carbon fiber is in the form of unidirectional carbon fiber cloth (unidirectional carbon fiber cloth refers to a cloth with a large number of carbon fiber filaments in one direction and only a small number of fine carbon fiber filaments in other directions), the large number of carbon fiber filaments extend along the fiber orientation, and the small number of carbon fiber filaments extend in other directions. The fiber orientation of the carbon fiber layer refers to the direction in which the large number of fiber filaments extend within the carbon fiber layer.

[0041] In some embodiments, the fiber orientations of the multiple second carbon fiber layers 12 in the matrix layer 10 may be different, but their general directions are consistent; or, in this application, the fiber orientation of the second carbon fiber layer 12 refers to the fiber orientation of the second carbon fiber layer 12 adjacent to the first protective layer 20. The fiber orientations of the multiple first carbon fiber layers 22 may be different, but their general directions are consistent; or, the fiber orientation of the first carbon fiber layer 22 refers to the fiber orientation of the first carbon fiber layer 22 adjacent to the matrix layer 10. In other embodiments, the first carbon fiber layer 22 may include multiple layers of carbon fibers, and the fiber orientations of different layers may be inconsistent.

[0042] To further enhance the tensile strength of the composite structure 100, the remaining second carbon fiber layers 12 of the matrix layer 10 are stacked in an interlaced fiber orientation manner. In an alternative embodiment, the remaining second carbon fiber layers of the matrix layer 10 are biaxial carbon fiber cloth, or a mixture of biaxial carbon fiber cloth and uniaxial carbon fiber cloth.

[0043] In some embodiments, the matrix layer 10 includes a second adhesive 11 and a multilayer second carbon fiber layer 12 impregnated with the second adhesive 11, and the first protective layer 20 includes a first adhesive 21 and a first carbon fiber layer 22 impregnated with the first adhesive 21.

[0044] Among them, the above Figure 1 The image only shows a single layer of carbon fiber in the carbon fiber layer and a portion of the corresponding adhesive.

[0045] Both the second adhesive 11 and the first adhesive 21 can be thermoplastic or thermosetting plastics. During processing, multiple layers of second carbon fiber 12 can be horizontally stacked and impregnated with the second adhesive 11, while the first carbon fiber 22 is stacked around the outer periphery of the substrate layer 10 and impregnated with the first adhesive 21. When the second adhesive 11 and the first adhesive 21 are made of the same material, the first carbon fiber 22 and the multiple layers of second carbon fiber 12 can be stacked together, impregnated with an adhesive such as resin, and then laminated and cured.

[0046] The first carbon fiber layer 22 can also be circumferential carbon fiber or other fibers.

[0047] In some embodiments, the composite structure 100 is a rod or tube, the matrix layer 10 is a cylindrical structure, the first protective layer 20 is an annular protective layer surrounding the outside of the matrix layer 10, the fiber orientation x of the first carbon fiber layer 22 is along the circumferential direction of the matrix layer 10, and the fiber orientation z of the second carbon fiber layer 12 is consistent with the axial direction of the matrix layer 10.

[0048] Wherein, the fiber orientation x of the first carbon fiber layer 22 is perpendicular to the fiber orientation z of the second carbon fiber layer 12. Since the first carbon fiber layer 22 is arranged around the outer periphery of the second carbon fiber layer 12, the fiber orientation x of the first carbon fiber layer 22 is the direction surrounding the fiber orientation z of the second carbon fiber layer 12, that is, the various directions included in the vertical plane of the fiber orientation z of the second carbon fiber layer 12.

[0049] In this embodiment, when the composite structure 100 is subjected to a force perpendicular to the fiber orientation z of the second carbon fiber layer 12, since the fiber orientation x of the first carbon fiber layer 22 located outside the second carbon fiber layer 12 is perpendicular to the fiber orientation z of the second carbon fiber layer 12, the problem of slippage of the second carbon fiber layer 12 in the matrix layer 10 due to the breakage of the second adhesive 11 can be improved. Furthermore, since the second carbon fiber layer 12 itself has high resistance strength along the fiber orientation z, this embodiment can improve the resistance strength of the composite structure 100, resulting in higher toughness and higher fracture resistance.

[0050] In this embodiment, the fiber orientation z of the second carbon fiber layer 12 is parallel to the axial direction of the first protective layer 20, and the fiber orientation x is consistent with the circumferential direction of the first protective layer 20. This facilitates the setting of the first carbon fiber layer 22, so that the fibers of the first carbon fiber layer 22 are wound around the second carbon fiber layer 12. This facilitates the cutting and ring stacking of the first carbon fiber layer 22, which simplifies the process and improves the reliability of the composite structure 100.

[0051] In this embodiment, the tensile strength includes not only tensile strength but also compressive strength.

[0052] The composite structure of this application is not limited to the cross-sectional shape of the composite structure 100 in the above embodiments.

[0053] like Figure 12 As shown, in other embodiments, the composite structure 100 can also be made of materials of other shapes, such as a cube; the matrix layer 10 is also cube-shaped accordingly, and the first carbon fiber layer 22 is wrapped around the outer periphery of the matrix layer 10, forming a structure similar to a rectangular frame. In this embodiment, the fiber orientation of a portion of the first carbon fiber layer 22 is parallel to the fiber orientation of the second carbon fiber layer 12 of the matrix layer 10; the fiber orientation of another portion of the first carbon fiber layer 22 is perpendicular to the fiber orientation of the second carbon fiber layer 12 of the matrix layer 10.

[0054] like Figure 13 As shown, in other embodiments, the composite structure 100 may also be composed of multiple layers of annular carbon fiber stacked together, with the layers bonded together by an adhesive layer.

[0055] In some embodiments, the composite structure 100 further includes a second protective layer 30, which is disposed around the outside of the first protective layer 20. The second protective layer 30 includes a third carbon fiber layer 32, wherein the third carbon fiber layer 32 is formed by interlacing carbon fibers with two different fiber orientations y (only one fiber orientation is shown here).

[0056] In this embodiment, a third carbon fiber layer 32 is provided on the side of the first protective layer 20 away from the second carbon fiber layer 12. The third carbon fiber layer 32 is woven together by two carbon fibers with different fiber orientations y, so that at least some of the carbon fibers in the third carbon fiber layer 32 have fiber orientations y that intersect with the fiber orientation x of the first carbon fiber layer 22 or the fiber orientation z of the second carbon fiber layer 12. Therefore, the tensile strength and fracture resistance of the composite structure 100 can be further improved.

[0057] In some embodiments, the second protective layer 30 is an annular protective layer to improve the protective effect on the first protective layer 20 inside it.

[0058] In some embodiments, the second protective layer 30 includes a third adhesive 31 and a third carbon fiber layer 32 impregnated with the third adhesive 31, so as to improve the tensile strength and structural stability of the second protective layer 30.

[0059] The third adhesive 31 can be referred to the first adhesive 21 or the second adhesive 11 mentioned above.

[0060] In some embodiments, at least a portion of the fiber orientation y of the third carbon fiber layer 32 intersects with the fiber orientation z.

[0061] In some embodiments, the extension direction y of some fibers in the third carbon fiber layer 32 intersects with the extension direction of another portion of fibers, and both intersect with fiber orientations x and z. This structure improves the tensile strength and fracture resistance of the composite structure 100 along other directions intersecting with fiber orientations x and z, thereby further enhancing the tensile strength and fracture resistance of the composite structure 100.

[0062] In some embodiments, such as Figure 4 As shown, the composite structure 100 further includes a third protective layer 4, which is wound around the outside of the first protective layer 20. The third protective layer 4 includes a fiber layer 402, which includes braided fibers, including aramid fibers. The braided fibers include aramid fibers to improve the aesthetics of the composite structure. The third protective layer 4 can further improve the tensile strength of the composite structure 100; the braided fibers may also include other types of fibers known in the prior art, such as nylon, polyester, etc.

[0063] Aramid fiber, also known as aramid fiber, is a fiber spun from aromatic polyamide resin. Aramid fiber has a higher elongation than carbon fiber, resulting in a first protective layer 20 with better toughness, i.e., better impact resistance. Therefore, a relatively neat texture can be obtained on the cross-section of the adjacent surface, further reducing the possibility of carbon fiber debris generation.

[0064] In some embodiments, the fiber orientation of the fiber layer 402 may intersect with at least one of the fiber orientations x and z to further enhance the tensile strength and fracture resistance of the composite structure 100.

[0065] In some embodiments, the third protective layer 4 is an annular protective layer to improve the protective effect on the first protective layer 20 inside it.

[0066] In some embodiments, the third protective layer 4 includes a fourth adhesive 401 and a fiber layer 402 impregnated with the fourth adhesive 401. The fourth adhesive 401 can be a translucent material, and the aramid fibers include undyed aramid fibers and / or several colored aramid fibers. Thus, the aramid fibers can be observed through the fourth adhesive 401, and the aramid fibers can achieve a more aesthetically pleasing texture and richer colors after using different weaving methods.

[0067] The fourth adhesive 401 is a thermosetting resin, thus the resulting third protective layer 4 has stronger tensile strength.

[0068] During processing, multiple layers of second carbon fiber 12 can be horizontally stacked and impregnated with second adhesive 11. First carbon fiber 22 can be stacked around the outer periphery of the matrix layer 10 and impregnated with first adhesive 21. Fiber layer 402 can be stacked around the outer periphery of the first carbon fiber layer 22 and impregnated with fourth adhesive 401. When the second adhesive 11, first adhesive 21, and fourth adhesive 401 are of the same material, the first carbon fiber layer 22, fiber layer 32, and multiple layers of second carbon fiber 12 can be stacked together, impregnated with adhesive, and then laminated and cured.

[0069] In some embodiments, such as Figure 5 As shown, the composite structure 100 further includes a third protective layer 4, which is wound around the outside of the second protective layer 30. The third protective layer 4 includes a fiber layer 402, which includes braided fibers, including aramid fibers. The third protective layer 4 in this embodiment can be referred to the third protective layer 4 in the above embodiments.

[0070] In some embodiments, such as Figure 2 As shown, the substrate layer 10 is a solid column. In this embodiment, the substrate layer 10 is a carbon fiber rod, which can improve the structural strength of the composite structure 100.

[0071] In some embodiments, such as Figure 3 As shown, the substrate layer 10 is arranged in the form of a hollow cylinder. In this embodiment, the substrate layer 10 is a carbon fiber tube, which can reduce the weight of the composite structure 100, and form a heat exchange channel in the middle of the substrate layer 10 (e.g., Figure 8 and Figure 9 The heat exchange channel 54 in the composite structure 100 is used to improve the heat exchange performance.

[0072] In some embodiments, the composite structure 100 includes a base layer 10, a first protective layer 20, a second protective layer 30, and a third protective layer 4 arranged sequentially from the inside to the outside.

[0073] In some embodiments, the composite structure 100 includes a base layer 10, a first protective layer 20, and a third protective layer 4 arranged sequentially from the inside to the outside.

[0074] In some embodiments, the composite structure 100 includes a base layer 10 and a second protective layer 30 arranged sequentially from the inside to the outside.

[0075] In some embodiments, the composite structure 100 includes a base layer 10, a second protective layer 30, and a third protective layer 4 arranged sequentially from the inside to the outside.

[0076] This application further proposes a type of granule, such as Figures 1 to 10 As shown, Figure 6 This is a three-dimensional structural schematic diagram of one embodiment of the present application. Figure 7 yes Figure 6 A schematic diagram of the structure of the semi-finished product during the processing of the granules in the example embodiment; Figure 8 This is a three-dimensional structural schematic diagram of another embodiment of the granules in this application; Figure 9 yes Figure 8 Another side view of the surface particles in the embodiment; Figure 10 yes Figure 8 A cross-sectional view of the surface grain in this embodiment. The surface grain 200 of this embodiment includes a composite structure 100, a matrix layer 10, and a first protective layer 20 wound around the outside of the matrix layer 10. The first protective layer 20 includes a first carbon fiber layer 22 wound around the outside of the matrix layer 10. The fiber orientation x of the first carbon fiber layer 22 is a circumferential or approximately circumferential direction surrounding the outer surface of the matrix layer 10. The composite structure 100 has a body portion 40 recessed inward along both sides of a second direction A1 to form the surface grain 200, and lugs 50 protruding from the sides of the body portion 40 along the second direction A1. The second direction A1 is parallel to the plane containing the circumferential direction. It is understood that the first carbon fiber layer 22 can also be woven from carbon fibers with two or more fiber orientations.

[0077] The second direction A1 being set parallel to the plane containing the circumferential direction means that the second direction A1 is either coplanar or parallel to the plane containing the circumferential direction.

[0078] In some application scenarios, the composite structure 100 can be cut to form surface particles 200. Specifically, the rod-shaped or tubular composite structure 100 can be first cut along its length to form completely separated segments, and then each segment can be cut a second time, resulting in a surface particle 200. This cutting can be done automatically, manually, or using other cutting methods available in the prior art.

[0079] In this embodiment, the fiber orientation x of the first carbon fiber layer 22, which is disposed around the first protective layer 20 on the outside of the matrix layer 10, is an annular or approximately circumferential direction surrounding the outer surface of the matrix layer 10. This can increase the tensile strength of the composite structure 100 along the annular or approximately circumferential direction of the matrix layer 10. Furthermore, the body portion 40 of the surface particles 200 and the lugs 50 are arranged along the second direction A1. Therefore, when the lugs 50 are subjected to a force along the second direction A1, since the second direction A1 is perpendicular to the vertical direction of the plane or approximately plane where the fiber orientation x of the first carbon fiber layer 22 is located, the direction of the force along the second direction A1 can be made to be consistent with or approximately consistent with a part of the direction of the fiber orientation x of the first carbon fiber layer 22. Therefore, the tensile strength of the lugs 50 and the surface particles 200 can be improved, resulting in higher toughness and higher fracture resistance.

[0080] In some embodiments, the surface particles 200 may be formed by processing the composite structure 100 in any of the preceding embodiments, including cutting and other existing processing methods, to shape the composite structure 100 into the form of the surface particles 200. For a detailed description and extension of this embodiment, please refer to the above embodiments.

[0081] In some embodiments, the composite structure 100 is cut inward along both sides of the second direction A1 to form a body portion 40 and a lug 50; and along the second direction A1, the root of the lug 50 extends to the substrate layer 10.

[0082] Wherein, the root of the lug 50 extends to the substrate layer 10, which means that the bottom of the groove formed by cutting the lug 50 on the composite structure 100 extends to the substrate layer 10, so that the membrane structure of the lug 50 includes the first protective layer 20 and the substrate layer 10, thereby increasing the tensile strength of the lug 50 itself, etc.

[0083] In some embodiments, the matrix layer 10 includes a second carbon fiber layer 12, the fiber orientation of which is in a first direction z, and the angle between the first direction z and the fiber orientation of the first carbon fiber layer 22 is 10° to 90°. In this embodiment, when the composite structure 100 is subjected to a force in a direction with an angle of 10° to 90° with respect to the fiber orientation of the second carbon fiber layer 12, the presence of the first carbon fiber layer 22 located outside the second carbon fiber layer 12 can improve the problem of slippage of the second carbon fiber layer 12 under force in the matrix layer 10. Furthermore, since the second carbon fiber layer 12 itself has high resistance strength along the first direction z, this embodiment can improve the resistance strength of the surface particles 200, resulting in higher toughness and fracture resistance. For a detailed description and extension of this embodiment, please refer to the above embodiments. The problem of slippage under stress refers to the fact that the matrix layer 10 is formed by the traction and bundling of carbon fibers or by the horizontal stacking of multiple carbon fiber layers; the carbon fibers or two carbon fiber layers are bonded by an adhesive layer. When under stress, because the structural strength of the adhesive layer is much less than that of the carbon fibers, the adhesive layer will fail before the carbon fibers when the stress exceeds the strength of the adhesive layer, thus causing slippage between the carbon fibers bonded by the adhesive layer.

[0084] In some embodiments, the composite structure 100 is a rod or tube, the matrix layer 10 is a cylindrical structure, the first protective layer 20 is an annular protective layer surrounding the outer side of the matrix layer 10, the fiber orientation x of the first carbon fiber layer 22 is along the circumferential direction of the matrix layer 10, and the fiber orientation z of the second carbon fiber layer 12 is consistent with the axial direction of the matrix layer 10. In this embodiment, when the surface particles 200 are subjected to a force perpendicular to the fiber orientation z of the second carbon fiber layer 12, since the fiber orientation x of the first carbon fiber layer 22 located outside the second carbon fiber layer 12 is perpendicular to the fiber orientation z of the second carbon fiber layer 12, the problem of slippage of the second carbon fiber layer 12 in the matrix layer 10 due to the breakage of the second adhesive 11 can be improved. Furthermore, since the second carbon fiber layer 12 itself has high resistance strength along the fiber orientation z, this embodiment can improve the resistance strength of the surface particles 200, resulting in higher toughness and higher fracture resistance. For a detailed description and extension of this embodiment, please refer to the above embodiments.

[0085] In some embodiments, the matrix layer 10 includes multiple layers of second carbon fiber 12; and / or, the first protective layer 20 includes multiple layers of first carbon fiber 22. This structure further improves the strength, toughness, and fracture resistance of the composite structure 100 and the surface particles 200. For a detailed description and extension of this embodiment, please refer to the above embodiments.

[0086] In some embodiments, the composite structure 100 further includes a second protective layer 30, which is disposed around the outside of the first protective layer 20. The second protective layer 30 includes a third carbon fiber layer 32, wherein the third carbon fiber layer 32 is formed by interlacing carbon fibers with two different fiber orientations y (only one fiber orientation is shown here).

[0087] In this embodiment, a third carbon fiber layer 32 is provided on the side of the first protective layer 20 opposite to the second carbon fiber layer 12. The third carbon fiber layer 32 is woven together from two carbon fibers with different fiber orientations y, such that at least a portion of the carbon fibers in the third carbon fiber layer 32 have fiber orientations y that intersect with the fiber orientation x of the first carbon fiber layer 22 or the fiber orientation z of the second carbon fiber layer 12. Therefore, the tensile strength and fracture resistance of the composite structure 100 and the surface particles 200 can be further improved. For a detailed description and extension of this embodiment, please refer to the above embodiment.

[0088] In some embodiments, such as Figure 4 As shown, the composite structure 100 further includes a third protective layer 4, which is wound around the outside of the first protective layer 20. The third protective layer 4 includes a fiber layer 402, which includes braided fibers, including aramid fibers. The braided fibers include aramid fibers to improve the aesthetics of the composite structure. The third protective layer 4 can further improve the tensile strength of the composite structure 100 and the surface particles 200. For a detailed description and extension of this embodiment, please refer to the above embodiment.

[0089] In some embodiments, such as Figure 5 As shown, the composite structure 100 further includes a third protective layer 4, which is wound around the outside of the second protective layer 30. The third protective layer 4 includes a fiber layer 402, which includes braided fibers, including aramid fibers. The third protective layer 4 in this embodiment can be referred to the third protective layer 4 in the above embodiments.

[0090] Among them, the thickness direction of the surface grain 200 (not shown in the figure), the second direction A1, and the axial direction z1 of the first protective layer 20 are perpendicular to each other, and the second main arrangement direction z of the second carbon fiber layer 12 is parallel to the axial direction z1 of the first protective layer.

[0091] The structure of the composite structure 100 can be referred to in the above embodiments, and will not be repeated here. The lug 50 is used to connect the surface grain 200 with other structures, such as adjacent surface grains 200.

[0092] In this embodiment, the second direction A1 of the protruding lug 50 is perpendicular to the axial direction z1 of the first protective layer 20. This allows the lug 50 to be subjected to a force perpendicular to the fiber orientation z of the second carbon fiber layer 12, i.e., the first direction A1. Since the fiber orientation x of the first carbon fiber layer 22 located outside the second carbon fiber layer 12 is perpendicular to the fiber orientation z of the second carbon fiber layer 12, the problem of slippage of the second carbon fiber layer 12 caused by the breakage of the second adhesive 11 between the second carbon fiber layers 12 in the matrix layer 10 can be improved. Furthermore, since the second carbon fiber layer 12 itself has a high resistance strength along the fiber orientation z, this embodiment can improve the tensile strength of the lug 50 and the surface particles 200, resulting in higher toughness and higher fracture resistance.

[0093] In some embodiments, the lug 50 includes a central lug 51 and two lateral lugs 52, and the body portion 40 includes a first side surface and a second side surface that are opposite to each other in the second direction A1. The central lug 51 is located in the middle region of the first side surface along the axial direction z1, and the two lateral lugs 52 are respectively located in the two end regions of the second side surface along the axial direction z1.

[0094] On the one hand, in this embodiment, the central lug 51 and the lateral lug 52 on opposite sides of the main body 40 can respectively connect with other structures located on opposite sides of the surface grain 200; on the other hand, the central lug 51 is located in the middle region along the axial direction z1 of the first side, and the two lateral lugs 52 are located at the two ends of the second side along the axial direction z1, so that the central lug 51 and the lateral lug 52 are staggered along the axial direction z1, which can improve the connection stability between the surface grain 200 and other structures on opposite sides, and improve the uniformity of the structural strength of each region of the surface grain 200 itself, thereby improving its reliability.

[0095] In some embodiments, the dimension D1 of the center lug 51 along the axial direction z1 is consistent with the groove width D2 between the two side lugs 52. With this structure, the groove between the two side lugs 52 of the watch strap 200 can be provided with the center lug 51 of an adjacent watch strap 200, and the center lug 51 of the watch strap 200 can be provided in the groove between the two side lugs 52 of another adjacent watch strap 200, thereby improving the structural strength of the entire watch strap.

[0096] In some embodiments, such as Figure 6 and Figure 7 As shown, the substrate layer 10 is a solid column; the central lug 51 and the two lateral lugs 52 are each provided with a first axial hole 53 extending along the axial direction z1, and the first axial hole 53 is located in the substrate layer 10. Figure 7 yes Figure 6 The embodiment is a semi-finished product form after the first shaft hole 53 is set and before heating and pressing.

[0097] On the one hand, the base layer 10 is set as a solid column, which can improve the structural strength of the watch strap 200. On the other hand, the watch strap 200 can be connected to other structures through the first shaft hole 53 and the connecting post. This connection method allows the watch strap 200 to be rotatably connected to other structures, thereby improving the flexibility of the entire watch strap and enhancing its ease of use and user experience.

[0098] The first shaft hole 53 is specifically located in the area of ​​the base layer 10 near the first protective layer 20.

[0099] In some embodiments, such as Figures 8 to 10 As shown, the substrate layer 10 is arranged in the form of a hollow column to form a heat exchange channel 54 in the middle. The heat exchange channel 54 passes through the body part 40 along the axial direction z1. The middle lug 51 is provided with a second shaft hole 55 located in the substrate layer 10 and communicating with the heat exchange channel 54.

[0100] On the one hand, this design reduces the weight of the watch teeth 200 and forms a heat exchange channel 54 in the middle of the base layer 10, improving the heat exchange performance of the watch teeth 200 and enhancing the user experience. The watch teeth 200 can be connected to other structures through the second shaft hole 55 and connecting post. This connection method allows for rotatable connection between the watch teeth 200 and other structures, thereby improving the overall flexibility of the watch band and enhancing ease of use and user experience. For example, the user's skin covered by the watch band is connected to the external environment through the heat exchange channel 54, achieving heat exchange. On the other hand, due to the presence of the first protective layer 20 and / or the second protective layer 30, the structural strength of the watch teeth 200 depends on the structural strength of the outer structure formed by the first protective layer 20 and / or the second protective layer 30. Therefore, adopting a hollow structure for the inner layer of the watch teeth 200, i.e., the base layer 10, does not significantly affect the structural strength of the watch teeth 200. Thus, a hollow structure can reduce the weight of the watch band and improve the user's wearing comfort.

[0101] In some embodiments, the heat exchange channel 54 includes an opening on either side of the surface grain 200; the heat exchange channel 54 may include a hollow structure portion of the substrate layer 10 and an opening on either side of the surface grain 200 that connects the hollow structure to the outside.

[0102] In some embodiments, the heat exchange channel 54 forms a second shaft hole 55 at the position of the center lug 51. The cross-sectional shape of the other end of the heat exchange channel 54 is set relative to the size of the connecting column, so that the connecting column can be directly set as a shaft hole.

[0103] In some embodiments, the lower end face of the body portion 40 is provided with a heat exchange through hole 56 communicating with the heat exchange channel 54. The heat exchange through hole 56 can accelerate the heat exchange between the heat exchange channel 54 and the user.

[0104] The lower end face of the main body 40 refers to the end face of the watch strap that faces the user's wrist when worn by the user.

[0105] In some embodiments, the second shaft holes 55 on the two side lugs 52 are coaxially arranged so that the connecting post that mates with the second shaft hole 55 can be in a straight line, which can reduce the difficulty of disassembling and assembling the watch grain 200.

[0106] In some embodiments, such as Figure 1 , 2 4, 5, 8 to Figure 10 As shown, the watch strap 200 includes a composite structure 100, within which a heat exchange channel 54 communicates with the external environment. This embodiment can reduce the weight of the watch strap 200, and through the heat exchange channel 54, it can improve the heat exchange performance of the watch strap 200, thus enhancing the user experience. For example, the user's skin covered by the watch strap communicates with the external environment through the heat exchange channel 54, achieving a heat exchange function.

[0107] In some embodiments, the composite structure 100 includes a matrix layer 10 and a first protective layer 20 wound around the outside of the matrix layer 10. The first protective layer 20 includes a first carbon fiber layer 22 wound around the outside of the matrix layer 10, wherein the fiber orientation x of the first carbon fiber layer 22 is a circumferential or approximately circumferential direction surrounding the outer surface of the matrix layer 10. A heat exchange channel 54 is disposed in the matrix layer 10 and extends through the composite structure 100 along the axial direction z of the matrix layer 10. It is understood that the first carbon fiber layer 22 may also be woven from carbon fibers with two or more fiber orientations. Specific embodiments and extensions can be found in the above embodiments.

[0108] The fiber orientation x of the first carbon fiber layer 22, which is disposed around the first protective layer 20 outside the matrix layer 10, is annular or approximately circumferential along the outer surface of the matrix layer 10. This increases the tensile strength of the composite structure 100 along the circumferential or approximately circumferential direction of the matrix layer 10, thereby improving the strength, toughness, and fracture resistance of the composite structure 100 and the surface particles 200. Furthermore, the heat exchange channel 54 formed in the middle of the matrix layer 10 improves the heat exchange performance of the surface particles 200, enhancing the user experience.

[0109] In some embodiments, the composite structure 100 has a body portion 40 recessed inward along both sides of the second direction A1 to form the surface particles 200, and lugs 50 protruding along the second direction A1 on the side of the body portion 40. The second direction A1 is parallel to the plane containing the circumferential direction. The heat exchange channel 54 extends along the second direction A1 through the body portion 40 to the side of the lugs 50 near the body portion 40. Detailed embodiments and extensions can be found in the above embodiments.

[0110] In some embodiments, the matrix layer 10 includes a second carbon fiber layer 12, the fiber orientation of which is in a first direction z, and the angle between the first direction z and the fiber orientation of the first carbon fiber layer 22 is 10° to 90°. In this embodiment, when the composite structure 100 is subjected to a force in a direction with an angle of 10° to 90° with respect to the fiber orientation of the second carbon fiber layer 12, the presence of the first carbon fiber layer 22 located outside the second carbon fiber layer 12 can improve the problem of slippage of the second carbon fiber layer 12 under force in the matrix layer 10. Furthermore, since the second carbon fiber layer 12 itself has high resistance strength along the first direction z, this embodiment can improve the resistance strength of the surface particles 200, resulting in higher toughness and fracture resistance. For a detailed description and extension of this embodiment, please refer to the above embodiments.

[0111] In some embodiments, the composite structure 100 is a rod or tube, the matrix layer 10 is a cylindrical structure, the first protective layer 20 is an annular protective layer surrounding the outer side of the matrix layer 10, the fiber orientation x of the first carbon fiber layer 22 is along the circumferential direction of the matrix layer 10, and the fiber orientation z of the second carbon fiber layer 12 is consistent with the axial direction of the matrix layer 10, which can improve the strength of the surface particles 200, resulting in higher toughness and fracture resistance. For a detailed description and extension of this embodiment, please refer to the above embodiments.

[0112] In some embodiments, the matrix layer 10 includes multiple layers of second carbon fiber 12; and / or, the first protective layer 20 includes multiple layers of first carbon fiber 22. This structure further improves the strength, toughness, and fracture resistance of the composite structure 100 and the surface particles 200. For a detailed description and extension of this embodiment, please refer to the above embodiments.

[0113] In some embodiments, the composite structure 100 further includes a second protective layer 30, wound around the outside of the first protective layer 20. The second protective layer 30 includes a third carbon fiber layer 32, wherein the third carbon fiber layer 32 is woven from two carbon fibers with different fiber orientations y (only one fiber orientation is shown here), which can further improve the tensile strength and fracture resistance of the composite structure 100 and the surface particles 200. For a detailed description and extension of this embodiment, please refer to the above embodiments.

[0114] In some embodiments, such as Figure 4 As shown, the composite structure 100 further includes a third protective layer 4, which is wound around the outside of the first protective layer 20. The third protective layer 4 includes a fiber layer 402, which includes braided fibers, including aramid fibers. The braided fibers include aramid fibers to improve the aesthetics of the composite structure. The third protective layer 4 can further improve the tensile strength of the composite structure 100 and the surface particles 200. For a detailed description and extension of this embodiment, please refer to the above embodiment.

[0115] In some embodiments, such as Figure 5 As shown, the composite structure 100 further includes a third protective layer 4, which is wound around the outside of the second protective layer 30. The third protective layer 4 includes a fiber layer 402, which includes braided fibers, including aramid fibers. The third protective layer 4 in this embodiment can be referred to the third protective layer 4 in the above embodiments.

[0116] Other structures of the surface particles 200 with heat exchange channel 54 can be found in the above embodiment without heat exchange channel 54.

[0117] The composite structure in the particles of this application can be referred to in the embodiments of the above-described composite structure.

[0118] This application further proposes a watch strap, such as Figure 11 As shown, Figure 11 This is a schematic diagram of the structure of an embodiment of the watch strap of this application. The watch strap 300 of this embodiment includes multiple interconnected watch beads 301, 410, and 501, which are the watch beads 200 of the above embodiments. Since the watch strap 200 adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. It is understood that the multiple watch beads 301, 410, and 501 may include male fasteners, female fasteners, and multiple unit fasteners. The structures of the multiple watch beads 301, 410, and 501 may be the same or different.

[0119] It should be noted that the composite structure 100, watch beads 200 and watch strap 300 provided in this application are not only for watches and other products, but can also be used in other portable products.

[0120] This application further proposes a method for preparing a composite structure, which includes the following steps:

[0121] Step S101: Prepare the substrate layer.

[0122] In some embodiments, the matrix layer comprises multiple layers of second carbon fibers.

[0123] In some embodiments, carbon fiber yarn can be used as raw material, rewound into a short length using a rewinding machine, and then the carbon fiber yarn can be wound onto a braiding machine spindle. Finally, the wound spindle can be placed on the braiding machine for later use.

[0124] In some embodiments, the carbon fibers can be impregnated with a first adhesive. The carbon fiber yarn is first stretched axially along the winding direction by a traction machine, and then the carbon fiber yarn is impregnated in epoxy resin, and the axial yarns are assembled into a pre-impregnated yarn bundle, which is the traction bundle.

[0125] In some embodiments, carbon fiber yarn is stretched axially along the winding direction by a traction machine to form a solid matrix layer; or axially extended carbon fibers are evenly distributed on a mandrel to form a hollow matrix layer.

[0126] Step S102: A first protective layer is wound around the outside of the matrix layer; wherein, the first protective layer includes a first carbon fiber layer wound around the outside of the matrix layer, and the fiber orientation of the first carbon fiber layer is a circumferential or approximately circumferential direction along the outer surface of the matrix layer.

[0127] In some embodiments, circumferential carbon fiber yarn is wound around the outside of the second carbon fiber layer to form a first carbon fiber layer with circumferential fiber orientation.

[0128] The fiber orientation of the first carbon fiber layer, which is disposed around the first protective layer outside the matrix layer, is a ring or approximately ring-shaped orientation that surrounds the outer surface of the matrix layer. This can increase the tensile strength of the composite structure along the ring or approximately ring-shaped direction of the matrix layer, thereby improving the strength, toughness and fracture resistance of the composite structure.

[0129] In some embodiments, the preparation method further includes step S102:

[0130] Step S102: A second protective layer is wound around the outside of the first protective layer; wherein the second protective layer includes a third carbon fiber layer, which is woven from two carbon fibers with different orientations.

[0131] A third carbon fiber layer is provided on the side of the first protective layer away from the second carbon fiber layer. The third carbon fiber layer is woven from two carbon fibers with different fiber orientations, so that the fiber orientation of at least some of the carbon fibers in the third carbon fiber layer intersects with the fiber orientation of the first carbon fiber layer or the fiber orientation of the second carbon fiber layer. Therefore, the tensile strength and fracture resistance of the composite structure can be further improved.

[0132] The adhesives in the substrate layer, the first protective layer, and the second protective layer can be applied simultaneously or asynchronously.

[0133] In some embodiments, a third carbon fiber layer is woven at 90-degree and 45-degree angles on the outer surface of the first carbon fiber layer to wrap woven fibers around the outside of the first carbon fiber layer.

[0134] In some embodiments, the preparation method further includes step S103:

[0135] Step S103: A second protective layer is wound around the outside of the first protective layer; wherein the second protective layer includes a third carbon fiber layer, the third carbon fiber layer is woven from two carbon fibers with different orientations; then a third protective layer is wound around the outside of the second protective layer, the third protective layer includes a fiber layer, the fiber layer includes braided fibers, and the braided fibers include aramid fibers.

[0136] Aramid fiber is a fiber spun from aromatic polyamide resin, also known as aramid fiber. Aramid fiber has a higher elongation than carbon fiber, resulting in a first protective layer 20 with better toughness, i.e., better impact resistance. Therefore, a relatively neat texture can be obtained on the cross-section of the adjacent surface, further reducing the possibility of carbon fiber debris generation.

[0137] In some embodiments, the preparation method further includes step S105:

[0138] Step S105: A third protective layer is wrapped around the outside of the first protective layer. The third protective layer includes a fiber layer, which includes braided fibers, and the braided fibers include aramid fibers.

[0139] The aforementioned carbon fibers and braided fibers can be impregnated with adhesive synchronously or asynchronously. In asynchronous impregnation, the adhesive used for each fiber can be the same or different.

[0140] The method for preparing the composite structure provided in this application can be used to prepare the composite structure of the above embodiments.

[0141] This application further proposes a method for preparing surface particles, comprising: preparing a composite structure using the preparation direction of the composite structure in the above embodiments; processing the composite structure using a pultrusion molding process and / or a thermoforming process to obtain a continuous carbon fiber rod or carbon fiber tube; processing the carbon fiber rod or carbon fiber tube using a cutting and finishing process to obtain a semi-finished product of the surface connector; and performing post-processing on the surface of the semi-finished product to obtain the finished product of the surface connector.

[0142] The matrix layer in the carbon fiber rod is a solid structure, while the matrix layer in the carbon fiber tube is a hollow structure.

[0143] In some embodiments, the method for preparing surface particles includes:

[0144] S1: Using the second carbon fiber yarn as raw material, rewind it into a short length using a rewinding machine, then wind the second carbon fiber yarn onto the spindle of the braiding machine, and finally place the wound spindle on the braiding machine for later use.

[0145] S2: The second carbon fiber yarn is tightened by a traction machine along the axial direction of the winding.

[0146] S3: The second carbon fiber yarn is immersed in epoxy resin, and the axial yarns are assembled into a pre-impregnated yarn bundle.

[0147] S4: Circumferential carbon fiber yarn is wound around the outside of the yarn bundle to form a first carbon fiber layer on the outside of the yarn bundle.

[0148] S5: A third carbon fiber layer is woven at 90 degrees and 45 degrees on the outer surface of the first carbon fiber layer to wrap woven fibers around the outside of the first carbon fiber layer.

[0149] S6: The semi-impregnated fibers, which combine axial, circumferential, and woven fibers, are pressurized and impregnated to ensure that they are completely covered with epoxy resin.

[0150] S7: A layer of aramid fiber is coated on the outer layer.

[0151] S8: Immersed in epoxy resin.

[0152] S9: A continuous carbon fiber rod is obtained by pultrusion molding and heat molding in a mold heated to 150°C to 190°C.

[0153] S10: Carbon fiber rods are cut into standard lengths of 1m or 2m using a fixed-length cutting machine.

[0154] S11: The particles are cut and refined using a Swiss-type lathe to obtain a complete semi-finished product.

[0155] S12: Post-processing of the surface of the semi-finished product, such as grinding or spraying, to obtain the finished product.

[0156] In some embodiments, the method for preparing surface particles includes:

[0157] S10: Using the second carbon fiber yarn as raw material, rewind it into a short length using a rewinding machine, then wind the second carbon fiber yarn onto the spindle of the braiding machine, and finally place the wound spindle on the braiding machine for later use.

[0158] S20: The second carbon fiber, which extends axially, is evenly distributed on the mandrel.

[0159] S30: Circumferential carbon fiber yarn is wound around the outside of the axially extending second carbon fiber to form a first carbon fiber layer on the outside of the yarn bundle.

[0160] S40: The third carbon fiber is braided at 90 degrees and 45 degrees on the outer surface of the first carbon fiber layer to wrap the braided fiber around the outside of the first carbon fiber layer.

[0161] S50: Semi-impregnated fibers, which combine axial, circumferential, and woven fibers, are pressure-impregnated to ensure they are fully impregnated with epoxy resin.

[0162] S60: A continuous carbon fiber tube is obtained by pultrusion molding in a mold heated to 150°C to 190°C and then thermoforming.

[0163] S70: Carbon fiber tubes are cut into standard lengths of 1 or 2 m using a fixed-length cutting machine.

[0164] S80: The particles are cut and refined by a Swiss-type lathe to obtain a complete semi-finished product.

[0165] S90: Post-processing of the surface of semi-finished products, such as grinding or spraying, to obtain the finished product.

[0166] The above-mentioned finished products can be assembled into a watch strap.

[0167] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A table grain, characterized in that, The composite structure comprises a heat exchange channel which is in communication with the external environment. The composite structure comprises a base layer and the heat exchange channel is arranged in the base layer and penetrates the composite structure along the axial direction of the base layer.

2. The table grain of claim 1, wherein, The composite structure comprises the base layer and a first protective layer arranged outside the base layer, and the first protective layer comprises a first carbon fiber layer arranged outside the base layer, and the carbon fibers of the first carbon fiber layer are oriented in a ring direction or an approximate ring direction along the outer surface of the base layer. The heat exchange channel is arranged in the base layer and penetrates the composite structure along the axial direction of the base layer.

3. The table grain of claim 2, wherein, The first carbon fiber layer is woven by at least two types of carbon fibers with different orientations.

4. The table grain of claim 2, wherein, The composite structure is concave inward along two sides in a second direction to form a body part of the surface grain and a lug protruding from the side surface of the body part along the second direction, and the second direction is arranged in parallel with the plane in which the ring direction is located. The heat exchange channel penetrates the body part to the side of the lug close to the body part along the second direction.

5. The table grain of claim 4, wherein, The lug comprises a middle lug and two side lugs, the body part comprises a first side surface and a second side surface which are away from each other in the second direction, the middle lug is located in the middle region of the first side surface along the axial direction of the first protective layer, and the two side lugs are respectively located in the two end regions of the second side surface along the axial direction.

6. The table grain of claim 5, wherein, The lower end surface of the body part is provided with a heat exchange through hole in communication with the heat exchange channel.

7. The table grain of claim 3, wherein, The base layer comprises a second carbon fiber layer, the orientation direction of the carbon fibers of the second carbon fiber layer is a first direction, and the included angle between the first direction and the orientation direction of the first carbon fiber layer is 10° to 90°.

8. The table grain of claim 7, wherein, The composite structure is a pipe, the base layer is a cylindrical structure, the first protective layer is an annular protective layer arranged outside the base layer, and the orientation of the carbon fibers of the first carbon fiber layer is along the ring direction of the base layer; and the orientation direction of the carbon fibers of the second carbon fiber layer is consistent with the axial direction of the base layer.

9. The table grain of claim 3, wherein, The composite structure further comprises: A second protective layer arranged outside the first protective layer, and the second protective layer comprises a third carbon fiber layer, and the third carbon fiber layer is woven by two types of carbon fibers with different orientation directions.

10. The table grain of claim 3, wherein, The composite structure further comprises: A third protective layer arranged outside the first protective layer, and the third protective layer comprises a fiber layer, and the fiber layer comprises woven fibers, and the woven fibers comprise aramid fibers.

11. The table grain of claim 9, wherein, The composite structure further comprises: A third protective layer arranged outside the second protective layer, and the third protective layer comprises a fiber layer, and the fiber layer comprises woven fibers, and the woven fibers comprise aramid fibers.

12. A watchband, characterized by The composite structure comprises a plurality of surface grains connected in sequence, and the surface grain is the surface grain according to any one of claims 1 to 11.

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