Watch grain and watchband

Abstract

The utility model discloses a watch grain and a watchband. The surface particle comprises a composite structure, the composite structure comprises a base body layer and a first protection layer wound on the outer side of the base body layer, the first protection layer comprises a first carbon fiber layer wound on the outer side of the base body layer, and the fiber orientation of the first carbon fiber layer is the annular direction or the approximate annular direction surrounding the outer surface of the base body layer. In this way, the fracture resistance of the watch particles and the watchband can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of portable product parts, in particular to a watch grain and a watchband. BACKGROUND

[0002] The single carbon fiber plate structure has the characteristics of light weight and high tensile strength, and is thus suitable as a raw material for parts of portable products. The single carbon fiber structure has the characteristic of being relatively easy to machine, because the adhesive of the single carbon fiber structure only contains one type of fiber, i.e. carbon fiber. However, the parts made of the single carbon fiber structure have the disadvantage of being prone to wear, for example, the watch grain made of the carbon fiber structure is prone to breakage of the lugs of the watch grain and carbon fiber debris when colliding with a hard object during use, which may cause damage to the user's skin. SUMMARY

[0003] To solve the above technical problems, the present application provides a watch grain and a watchband to improve the anti-fracture performance of the composite structure, the watch grain and the watchband.

[0004] The present application provides a watch grain, which comprises a composite structure, the composite structure comprising a base layer and a first protective layer arranged outside the base layer, the first protective layer comprising a first carbon fiber layer arranged outside the base layer, the fiber orientation of the first carbon fiber layer being in a ring direction or an approximately ring direction along the outer surface of the base layer.

[0005] The present application provides a watchband, which comprises a plurality of watch grains connected in sequence, the watch grain being the above-mentioned watch grain.

[0006] The present application has the beneficial effect that the watch grain provided by the present application comprises a composite structure, the composite structure comprising a base layer and a first protective layer arranged outside the base layer, the first protective layer comprising a first carbon fiber layer arranged outside the base layer, the fiber orientation of the first carbon fiber layer being in a ring direction or an approximately ring direction along the outer surface of the base layer. In the present application, the fiber orientation of the first carbon fiber layer of the first protective layer arranged outside the base layer is in a ring direction or an approximately ring direction along the outer surface of the base layer, which can increase the tensile strength of the composite structure in the ring direction or the approximately ring direction of the base layer, and thus can improve the tensile strength of the watch grain, the toughness is higher, and the anti-fracture performance is higher. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[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 the present application, it should be noted that unless specifically defined and limited otherwise, the terms "connected", "connection" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0023] In the embodiments of the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0024] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0025] The single carbon fiber structure has the characteristics of light weight and high tensile strength, and is suitable for the raw material of the parts of portable products. Since most of the single carbon fiber structure only includes one kind of fiber, i.e. carbon fiber, in the adhesive, the single carbon fiber structure also has the characteristic of being relatively easy to machine.

[0026] In the prior art, the manufacturing process of the carbon fiber watchband includes: stacking multiple carbon fiber sheets to form a carbon fiber plate, the carbon fiber sheets are bonded by an adhesive, and the adhesive forms an adhesive layer between the adjacent two carbon fiber sheets; and then the carbon fiber plate is cut into the shape of a watchband.

[0027] In the use scenario of the watch grain, the watch grains are connected to each other to form a watchband. When the watch grain is subjected to a pulling force, especially a pulling force in the same plane as the fiber orientation of the carbon fiber plate (or a transverse pulling force), the watch grain is prone to breakage. The inventors of the present application have found that the reason for the breakage is that, when subjected to a transverse pulling force, the adhesive layer between the carbon fiber layers in the base layer of the watch grain is prone to breakage, causing interlayer slip between the carbon fiber layers, thereby causing the watch grain to break. This is caused by the fact that the tensile strength of the adhesive layer is less than the tensile strength of the carbon fiber.

[0028] To solve the above problems, the present application provides a composite structure, a watch grain, a watchband, a preparation method of the composite structure, and a preparation method of the watch grain, to improve the anti-breakage performance of the composite structure, the watch grain and the watchband, and to improve the tensile strength.

[0029] Firstly, the present application provides a composite structure, as shown in Figure 1 , Figure 2 , Figure 3 , the present application provides a composite structure, as shown in Figure 1 is a schematic diagram of the layered structure of an embodiment of the composite structure of the present application, Figure 2 is a schematic diagram of the cross-sectional structure of an embodiment of the composite structure of the present application, Figure 3 is a schematic diagram of the cross-sectional structure of another embodiment of the composite structure of the present application. The composite structure 100 can be used in a watch grain or other structure, and the present application will be described by taking the watch grain as an example. The composite structure 100 comprises: a base layer 10 and a first protective layer 20 wound around the outer side of the base layer 10, the first protective layer 20 can comprise a fiber layer wound around the outer side of the base layer 10; the fiber layer is tightly wound around the base layer 10, and in an embodiment, the fiber layer can be wound around the periphery of the base layer 10 by weaving, or the fiber layer can be wrapped around the periphery of the base layer 10; the first protective layer 20 and the base layer 10 can be bonded by an adhesive; the fiber orientation of the fiber layer is circumferential or similar circumferential around the periphery of the base layer 10, for example, the cross section of the base layer 10 is circular or elliptical, and the fiber orientation of the fiber layer is circumferential around the base layer 10; in other schemes, the cross section of the base layer 10 can also be rectangular or other polygons, and the first protective layer 20 can be composed of fibers wound around such a shaped base layer 10 to form the first protective layer 20 surrounding the outer surface of the base layer 10. The fiber orientation of the first protective layer 20 and the fiber orientation of the base layer 10 have an included angle. The present application does not limit the number of carbon fiber layers of the first protective layer 20, which can be one fiber layer or multiple fiber layers stacked; the multiple fiber layers can be bonded by an adhesive.

[0030] The first protective layer 20 can include a first carbon fiber layer 22 wrapped around the outside of the base layer 10. The fiber orientation x of the first carbon fiber layer 22 can be circumferential or approximately circumferential, as described above, according to the shape of the base layer 10.

[0031] In one embodiment, the first carbon fiber layer 22 can include only one type of carbon fiber with a fiber orientation, formed by winding the carbon fiber bundle as described above. In another embodiment, the first carbon fiber layer 22 can also include at least two types of carbon fiber layers woven together, i.e., it can include two types of carbon fiber with different fiber orientations, or three types of carbon fiber with different fiber orientations, or more types of carbon fiber with different fiber orientations. This will not be described in detail here.

[0032] Here, the circumferential direction of the base layer 10 can refer to the circumferential direction of the outer surface of the base layer 10.

[0033] The first protective layer 20 described above has a fiber layer with a circumferential orientation, which can improve the tensile strength of the base layer 10. Taking a carbon fiber base as an example, in one embodiment, the base layer 10 is formed by a carbon fiber bundle with the same fiber orientation, which includes one type of carbon fiber with a fiber orientation. The carbon fibers are bonded together by an adhesive, which forms an adhesive layer. In one embodiment, the base layer 10 is formed by horizontally stacking multiple carbon fiber layers. When a tensile force is applied in the direction of the fiber orientation of the carbon fiber layer, the overall tensile strength of the material is strengthened by the fibers of the first protective layer 20 surrounding the periphery of the base layer 10. The base layer 10 is protected from interlayer slip when subjected to the tensile force in the above direction, so that the material breaks at the strength of the fibers of the first protective layer 20, rather than at the structural strength of the interlayer adhesive layer of the base layer 10.

[0034] In this embodiment, the fiber orientation x of the first carbon fiber layer 22 of the first protective layer 20 wrapped around the outside of the base layer 10 is circumferential or approximately circumferential around the outer surface of the base layer 10. This can increase the tensile strength of the composite structure 100 in the circumferential or approximately circumferential direction of the base layer 10, and thus improve the strength of the composite structure 100, increase its toughness, and improve its fracture resistance.

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

[0036] In some embodiments, the base layer 10 comprises a second carbon fiber layer 12, the fiber orientation of the second carbon fiber layer 12 is the first direction z, and the angle between the fiber orientation of the first carbon fiber layer 22 and the fiber orientation of the second carbon fiber layer 12 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 the fiber orientation of the second carbon fiber layer 12, the problem of the second carbon fiber layer 12 slipping in the base layer 10 can be improved due to the presence of the first carbon fiber layer 22 outside the second carbon fiber layer 12, and the strength of the second carbon fiber layer 12 itself along the first direction z is high, so this embodiment can improve the strength of the composite structure 100, and the toughness and fracture resistance are high.

[0037] In some embodiments, the second carbon fiber layer 12 can be formed by pulling a bundle of carbon fibers with the same fiber orientation, and the carbon fibers are bonded by an adhesive to form an adhesive layer; in some embodiments, the second carbon fiber layer 12 can comprise a plurality of carbon fiber layers, which are stacked together; the plurality of carbon fiber layers are connected by an adhesive layer. The fiber orientations of the carbon fibers in different layers of the plurality of carbon fiber layers can be consistent or inconsistent; the carbon fibers belonging to the same layer can also be woven from a plurality of carbon fibers with different fiber orientations. In some embodiments, the adhesive can be epoxy resin.

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

[0039] In some embodiments, the base layer 10 comprises a plurality of second carbon fiber layers 12; and / or, the first protective layer 20 comprises a plurality of first carbon fiber layers 22. Through this structure, the strength of the composite structure 100 can be further improved, and the toughness and fracture resistance are high.

[0040] In some embodiments, the carbon fiber is a fiber with a carbon content of 85% to 99% made from polyacrylonitrile fiber, pitch fiber or viscose fiber, etc. through a pre-oxidation and carbonization process. When the carbon fiber is in the form of unidirectional carbon fiber cloth (unidirectional carbon fiber cloth refers to a carbon fiber cloth that has a large number of carbon fiber filaments in one direction and only a small number of carbon fiber filaments in other directions, which are usually thin), a large number of carbon fiber filaments extend along the fiber orientation, and a small number of carbon fiber filaments extend along other directions. Among them, the fiber orientation of the carbon fiber layer is the extension direction of the large number of fiber filaments in the carbon fiber layer.

[0041] In some embodiments, the fiber orientations of the second carbon fiber layers 12 in the base layer 10 can be different, but the general directions are consistent; or the fiber orientation of the second carbon fiber layers 12 in the present application refers to the fiber orientation of the second carbon fiber layers 12 adjacent to the first protective layer 20. The fiber orientations of the first carbon fiber layers 22 can be different, but the general directions are consistent; or the fiber orientation of the first carbon fiber layers 22 refers to the fiber orientation of the first carbon fiber layers 22 adjacent to the base layer 10. In other embodiments, the first carbon fiber layers 22 can include multiple layers of carbon fibers, and the fiber orientations of different layers can not be consistent.

[0042] In order to further improve the tensile strength of the composite structure 100, the remaining second carbon fiber layers 12 of the base layer 10 are stacked in a staggered manner with fiber orientations. In alternative embodiments, the remaining second carbon fiber layers of the base layer 10 are bidirectional carbon fiber cloths, or a mixture of bidirectional carbon fiber cloths and unidirectional carbon fiber cloths.

[0043] In some embodiments, the base layer 10 includes the second adhesive 11 and the multiple second carbon fiber layers 12 impregnated in the second adhesive 11, and the first protective layer 20 includes the first adhesive 21 and the first carbon fiber layers 22 impregnated in the first adhesive 21.

[0044] In the above, only a single layer of carbon fibers in the carbon fiber layers and a portion of the corresponding adhesive are shown. Figure 1

[0045] In the above, only a single layer of carbon fibers in the carbon fiber layers and a portion of the corresponding adhesive are shown.

[0046] The first carbon fiber layers 22 can also be hoop carbon fibers or other fibers, etc.

[0047] In some embodiments, the composite structure 100 is a rod or a pipe, the base layer 10 is a cylindrical structure, the first protective layer 20 is an annular protective layer arranged on the outside of the base layer 10, and the fiber orientation x of the first carbon fiber layers 22 is in the hoop direction of the base layer 10; the fiber orientation z of the second carbon fiber layers 12 is consistent with the axial direction of the base 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 comprises a second protective layer 30 disposed around the outside of the first protective layer 20, the second protective layer 30 comprising a third carbon fiber layer 32, wherein the third carbon fiber layer 32 is interlaced woven from carbon fibers of two different fiber orientations y (only one fiber orientation is shown here).

[0056] In the present embodiment, the third carbon fiber layer 32 is disposed on the side of the first protective layer 20 facing away from the second carbon fiber layer 12, and the third carbon fiber layer 32 is interlaced woven from carbon fibers of two different fiber orientations y, such that the fiber orientations y of at least some of the carbon fibers in the third carbon fiber layer 32 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, thereby further improving the tensile strength and fracture resistance of the composite structure 100.

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

[0058] In some embodiments, the second protective layer 30 comprises a third adhesive 31 and a third carbon fiber layer 32 impregnated in 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 refer to the first adhesive 21 or the second adhesive 11 described above.

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

[0061] In some embodiments, the extension directions y of some of the fiber filaments of the third carbon fiber layer 32 intersect with the extension directions of other fiber filaments, and both intersect with the fiber orientation x and the fiber orientation z. Through this structure, the resistance performance of the composite structure 100 in other directions intersecting with the fiber orientation x and the fiber orientation z can be improved, thereby further improving the tensile strength and fracture resistance of the composite structure 100.

[0062] In some embodiments, as shown in Figure 4 The third protective layer 4 can further improve the tensile strength of the composite structure 100; the woven fibers can 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 may 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 or processed to form the tablet 200. In which, the composite structure 100 in a rod or tube shape can be cut along the length direction to form multiple segments, and each segment can be cut again to form a tablet 200. The cutting can be performed by mechanical automatic cutting or manual cutting, or other cutting methods in the prior art.

[0079] In the embodiment, the fiber orientation x of the first carbon fiber layer 22 around the first protective layer 20 outside the base layer 10 is annular or approximately annular along the outer surface of the base layer 10, which can increase the tensile strength of the composite structure 100 along the annular or approximately annular direction of the base layer 10, etc. Further, the body part 40 and the lug 50 of the tablet 200 are arranged along the second direction A1, so when the lug 50 is subjected to a force along the second direction A1, the second direction A1 is perpendicular to the vertical direction of the plane or approximately plane of the fiber orientation x of the first carbon fiber layer 22, so that the direction of the force along the second direction A1 is consistent or approximately consistent with the direction of the fiber orientation x of the first carbon fiber layer 22, thereby improving the tensile strength of the lug 50 and the tablet 200, and the tablet 200 has high toughness and high fracture resistance.

[0080] In some embodiments, the tablet 200 can be formed by processing the composite structure 100 in any of the previous embodiments, including cutting and other existing processing methods to form the shape of the tablet 200. The specific introduction and expansion of the embodiment can be referred to the above embodiments.

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

[0082] In which, the root of the lug 50 extending to the base layer 10 means that the bottom of the groove cut on the composite structure 100 to form the lug 50 extends to the base layer 10, so that the film layer structure of the lug 50 includes the first protective layer 20 and the base layer 10, thereby increasing the tensile capacity of the lug 50 itself, etc.

[0083] In some embodiments, the base layer 10 comprises a second carbon fiber layer 12, the fiber orientation of the second carbon fiber layer 12 is in the first direction z, and the angle between the fiber orientation of the first carbon fiber layer 22 and the fiber orientation of the second carbon fiber layer 12 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 the fiber orientation of the second carbon fiber layer 12, the problem of the second carbon fiber layer 12 slipping in the base layer 10 can be improved due to the presence of the first carbon fiber layer 22 outside the second carbon fiber layer 12, and the strength of the resistance of the second carbon fiber layer 12 itself along the first direction z is high, so that the strength of the resistance of the surface grain 200 can be improved, the toughness is high, and the anti-fracture performance is high. The specific introduction and expansion of this embodiment can be referred to the above-mentioned embodiments. The problem of slipping refers to that the base layer 10 is formed by carbon fiber traction bundle or is formed by horizontally stacking multiple carbon fiber layers; the carbon fibers or the two carbon fiber layers are bonded by the adhesive layer, and when subjected to a force, the adhesive layer will be damaged before the carbon fiber because the structural strength of the adhesive layer is much smaller than that of the carbon fiber, thereby causing the carbon fibers bonded by the adhesive layer to slip.

[0084] In some embodiments, the composite structure 100 is a rod or a pipe, the base layer 10 is a cylindrical structure, the first protective layer 20 is an annular protective layer arranged outside the base layer 10, and the fiber orientation x of the first carbon fiber layer 22 is along the circumferential direction of the base layer 10; the fiber orientation z of the second carbon fiber layer 12 is consistent with the axial direction of the base layer 10. In this embodiment, when the surface grain 200 is subjected to a force in a direction perpendicular to the fiber orientation z of the second carbon fiber layer 12, the fiber orientation x of the first carbon fiber layer 22 arranged outside the second carbon fiber layer 12 is perpendicular to the fiber orientation z of the second carbon fiber layer 12, so that the problem of the second carbon fiber layer 12 slipping due to the problem of the second adhesive 11 breaking and the like in the base layer 10 can be improved, and the strength of the resistance of the surface grain 200 can be improved, the toughness is high, and the anti-fracture performance is high. The specific introduction and expansion of this embodiment can be referred to the above-mentioned embodiments.

[0085] In some embodiments, the base layer 10 comprises multiple second carbon fiber layers 12; and / or, the first protective layer 20 comprises multiple first carbon fiber layers 22. Through this structure, the strength of the resistance of the composite structure 100 and the surface grain 200 can be further improved, the toughness is high, and the anti-fracture performance is high. The specific introduction and expansion of this embodiment can be referred to the above-mentioned embodiments.

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

[0087] In the embodiment, the third carbon fiber layer 32 is disposed on the side of the first protective layer 20 away from the second carbon fiber layer 12, and the third carbon fiber layer 32 is interlaced woven by carbon fibers of two different fiber orientations y, so that the fiber orientations y of at least part of the carbon fibers in the third carbon fiber layer 32 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, thereby further improving the tensile strength and fracture resistance of the composite structure 100 and the surface grain 200. The specific introduction and expansion of the embodiment can be referred to the above-mentioned embodiments.

[0088] In some embodiments, as shown in FIG. 1B, the composite structure 100 further comprises a third protective layer 4 disposed around the outside of the first protective layer 20, the third protective layer 4 comprising a fiber layer 402, the fiber layer 402 comprising woven fibers, and the woven fibers comprising aramid fibers. The woven fibers comprising aramid fibers can improve the aesthetic level of the composite structure. The third protective layer 4 can further improve the tensile strength of the composite structure 100 and the surface grain 200. The specific introduction and expansion of the embodiment can be referred to the above-mentioned embodiments. Figure 4 In some embodiments, as shown in FIG. 1B, the composite structure 100 further comprises a third protective layer 4 disposed around the outside of the first protective layer 20, the third protective layer 4 comprising a fiber layer 402, the fiber layer 402 comprising woven fibers, and the woven fibers comprising aramid fibers. The woven fibers comprising aramid fibers can improve the aesthetic level of the composite structure. The third protective layer 4 can further improve the tensile strength of the composite structure 100 and the surface grain 200. The specific introduction and expansion of the embodiment can be referred to the above-mentioned embodiments.

[0089] Figure 5 In some embodiments, as shown in FIG. 1B, the composite structure 100 further comprises a third protective layer 4 disposed around the outside of the first protective layer 20, the third protective layer 4 comprising a fiber layer 402, the fiber layer 402 comprising woven fibers, and the woven fibers comprising aramid fibers. The woven fibers comprising aramid fibers can improve the aesthetic level of the composite structure. The third protective layer 4 can further improve the tensile strength of the composite structure 100 and the surface grain 200. The specific introduction and expansion of the embodiment can be referred to the above-mentioned embodiments.

[0090] In some embodiments, as shown in FIG. 1B, the composite structure 100 further comprises a third protective layer 4 disposed around the outside of the first protective layer 20, the third protective layer 4 comprising a fiber layer 402, the fiber layer 402 comprising woven fibers, and the woven fibers comprising aramid fibers. The woven fibers comprising aramid fibers can improve the aesthetic level of the composite structure. The third protective layer 4 can further improve the tensile strength of the composite structure 100 and the surface grain 200. The specific introduction and expansion of the embodiment can be referred to the above-mentioned embodiments.

[0091] In some embodiments, as shown in FIG. 1B, the composite structure 100 further comprises a third protective layer 4 disposed around the outside of the first protective layer 20, the third protective layer 4 comprising a fiber layer 402, the fiber layer 402 comprising woven fibers, and the woven fibers comprising aramid fibers. The woven fibers comprising aramid fibers can improve the aesthetic level of the composite structure. The third protective layer 4 can further improve the tensile strength of the composite structure 100 and the surface grain 200. The specific introduction and expansion of the embodiment can be referred to the above-mentioned embodiments.

[0092] ​In the embodiment, the second direction A1 in which the lug 50 is protruded is perpendicular to the axial direction z1 of the first protective layer 20, so that when the lug 50 is subjected to a force in the first direction A1 which is perpendicular to the fiber orientation z of the second carbon fiber layer 12, the fiber orientation x of the first carbon fiber layer 22 which is arranged outside the second carbon fiber layer 12 is perpendicular to the fiber orientation z of the second carbon fiber layer 12, thus improving the problem of the second carbon fiber layer 12 slipping due to the fracture of the second adhesive 11 between the second carbon fiber layers 12 in the matrix layer 10, and since the second carbon fiber layer 12 itself has high resistance strength along the fiber orientation z, the embodiment can improve the tensile strength of the lug 50 and the surface grain 200, has high toughness, and has high fracture resistance.

[0093] In some embodiments, the lug 50 includes a middle lug 51 and two side lugs 52, and the body part 40 includes a first side and a second side which are away from each other in the second direction A1, the middle lug 51 is located in the middle region of the first side in the axial direction z1, and the two side lugs 52 are respectively located in the two end regions of the second side in the axial direction z1.

[0094] On the one hand, the middle lug 51 and the side lug 52 on the opposite sides of the body part 40 can be respectively connected to other structures located on the opposite sides of the surface grain 200; on the other hand, the middle lug 51 is located in the middle region of the first side in the axial direction z1, and the two side lugs 52 are respectively located in the two end regions of the second side in the axial direction z1, so that the middle lug 51 and the side lug 52 are staggered in the axial direction z1, which can improve the connection stability between the surface grain 200 and the other structures on the opposite sides, and improve the uniformity of the structural strength of each region of the surface grain 200 itself, thereby improving the reliability thereof.

[0095] In some embodiments, the size D1 of the middle lug 51 in the axial direction z1 is consistent with the slot width D2 between the two side lugs 52. Through this structure, the slot between the two side lugs 52 of the surface grain 200 can be provided with the middle lug 51 of an adjacent surface grain 200, and the middle lug 51 of the surface grain 200 can be arranged in the slot between the two side lugs 52 of another adjacent surface grain 200, thereby improving the structural strength of the entire watchband.

[0096] In some embodiments, as shown in Figure 6 and Figure 7 , the matrix layer 10 is arranged in the form of a solid cylinder; the middle lug 51 and the two side lugs 52 are each provided with a first shaft hole 53 which extends in the axial direction z1, and the first shaft hole 53 is located in the matrix layer 10. Among them, Figure 7 is Figure 6 the semi-product form before the first shaft hole 53 is arranged and before the hot-pressing forming in the embodiment.

[0097] In one aspect, the base layer 10 is arranged as a solid cylinder to improve the structural strength of the bezel 200. In another aspect, the bezel 200 can be connected to other structures through the first shaft hole 53 and the connecting column. This connection mode enables the bezel 200 to be rotatably connected to other structures, thereby improving the bendability of the entire watchband, and improving the convenience and experience of use.

[0098] The first shaft hole 53 is specifically arranged at a region of the base layer 10 close to the first protective layer 20.

[0099] In some embodiments, as shown in Figures 8 to 10 the base layer 10 is arranged as a hollow cylinder to form a heat exchange channel 54 in the middle, and the heat exchange channel 54 penetrates the body part 40 along the axial direction z1; the median lug 51 is provided with a second shaft hole 55 located in the base layer 10 and communicating with the heat exchange channel 54.

[0100] In one aspect, the weight of the bezel 200 can be reduced, and the heat exchange performance of the bezel 200 can be improved by forming the heat exchange channel 54 in the middle of the base layer 10, thereby improving the experience of use. The bezel 200 can be connected to other structures through the second shaft hole 55 and the connecting column. This connection mode enables the bezel 200 to be rotatably connected to other structures, thereby improving the bendability of the entire watchband, and improving the convenience and experience of use. For example, the skin of the user covered by the watchband is in communication with the external environment through the heat exchange channel 54 to realize the heat exchange function. In another aspect, due to the presence of the first protective layer 20 and / or the second protective layer 30, the structural strength of the bezel 200 depends on the structural strength of the peripheral structure formed by the first protective layer 20 and / or the second protective layer 30, so that the hollow structure of the base layer 10 does not have a significant impact on the structural strength of the bezel 200. Therefore, the weight of the watchband can be reduced and the wearing comfort of the user can be improved by using the hollow structure.

[0101] In some embodiments, the heat exchange channel 54 includes an opening on any one surface of the bezel 200; the heat exchange channel 54 can include a hollow structure part of the base layer 10 and an opening on any one surface of the bezel 200, which communicates the hollow structure with the outside.

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

[0103] In some embodiments, the lower end surface of the body part 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 surface of the body part 40 refers to an end surface facing the wrist of the user when the watchband is 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 column matched with the second shaft hole 55 can be linear, which can reduce the disassembly difficulty of the watch grain 200.

[0106] In some embodiments, as shown in Figure 1 , 2 , 4, 5, 8 to Figure 10 , the watch grain 200 includes a composite structure 100, and the heat exchange channel 54 in communication with the external environment is arranged in the composite structure 100. The embodiment can reduce the weight of the watch grain 200, and through the heat exchange channel 54, the heat exchange performance of the watch grain 200 can be improved, and the use experience can be improved. For example, the skin of the user covered by the watchband is in communication with the external environment through the heat exchange channel 54, and the heat exchange function is realized.

[0107] In some embodiments, the composite structure 100 includes: a base layer 10 and a first protective layer 20 arranged outside the base layer 10, the first protective layer 20 includes a first carbon fiber layer 22 arranged outside the base layer 10, and the fiber orientation x of the first carbon fiber layer 22 is a ring direction or an approximate ring direction along the outer surface of the base layer 10. The heat exchange channel 54 is arranged in the base layer 10 and penetrates the composite structure 100 along the axial direction z of the base layer 10. It can be understood that the first carbon fiber layer 22 can also be woven by two or more kinds of carbon fibers. The specific implementation and expansion can be referred to the above-mentioned embodiments.

[0108] The fiber orientation x of the first carbon fiber layer 22 of the first protective layer 20 arranged outside the base layer 10 is a ring or an approximate ring along the outer surface of the base layer 10, which can increase the tensile strength of the composite structure 100 along the ring direction or the approximate ring direction of the base layer 10, etc., so as to improve the strength of the composite structure 100 and the watch grain 200, and the toughness and the fracture resistance are high. The heat exchange channel 54 is formed in the middle of the base layer 10, which can improve the heat exchange performance of the watch grain 200 and improve the use experience.

[0109] In some embodiments, the composite structure 100 is inwardly recessed along two sides of the second direction A1 to form the body part 40 of the watch grain 200 and the lug 50 protruding to the side surface of the body part 40 along the second direction A1, and the second direction A1 is arranged in parallel with the plane of the ring direction; wherein the heat exchange channel 54 penetrates the body part 40 to the side of the lug 50 close to the body part 40 along the second direction A1. The specific implementation and expansion can be referred to the above-mentioned embodiments.

[0110] In some embodiments, the base layer 10 comprises a second carbon fiber layer 12, the fiber orientation of the second carbon fiber layer 12 is in the first direction z, and the angle between the fiber orientation of the first carbon fiber layer 22 and the fiber orientation of the second carbon fiber layer 12 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 the fiber orientation of the second carbon fiber layer 12, the problem of the second carbon fiber layer 12 slipping in the base layer 10 can be improved due to the presence of the first carbon fiber layer 22 outside the second carbon fiber layer 12, and the strength of the second carbon fiber layer 12 itself in the first direction z is high, so this embodiment can improve the strength of the surface grain 200, and the toughness and fracture resistance are high. The specific introduction and expansion of this embodiment can be referred to the above-mentioned embodiments.

[0111] In some embodiments, the composite structure 100 is a rod or a pipe, the base layer 10 is a cylindrical structure, the first protective layer 20 is an annular protective layer arranged outside the base layer 10, and the fiber orientation x of the first carbon fiber layer 22 is in the circumferential direction of the base layer 10; the fiber orientation z of the second carbon fiber layer 12 is consistent with the axial direction of the base layer 10, which can improve the strength of the surface grain 200, and the toughness and fracture resistance are high. The specific introduction and expansion of this embodiment can be referred to the above-mentioned embodiments.

[0112] In some embodiments, the base layer 10 comprises a plurality of second carbon fiber layers 12; and / or, the first protective layer 20 comprises a plurality of first carbon fiber layers 22. Through this structure, the strength of the composite structure 100 and the surface grain 200 can be further improved, and the toughness and fracture resistance are high. The specific introduction and expansion of this embodiment can be referred to the above-mentioned embodiments.

[0113] In some embodiments, the composite structure 100 further comprises: a second protective layer 30 arranged outside the first protective layer 20, and the second protective layer 30 comprises a third carbon fiber layer 32, wherein the third carbon fiber layer 32 is formed by intersecting and weaving carbon fibers with two 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 grain 200. The specific introduction and expansion of this embodiment can be referred to the above-mentioned embodiments.

[0114] In some embodiments, as shown in Figure 4 The third protective layer 4 comprises a fiber layer 402, and the fiber layer 402 comprises woven fibers, and the woven fibers comprise aramid fibers. The woven fibers comprise aramid fibers to improve the aesthetic degree of the composite structure. The third protective layer 4 can further improve the tensile strength of the composite structure 100. The specific introduction and expansion of this embodiment can be referred to the above-mentioned embodiments.

[0115] In some embodiments, as shown in Figure 5 The composite structure 100 further comprises a third protective layer 4 arranged outside the second protective layer 30, and the third protective layer 4 comprises a fiber layer 402 comprising woven fibers, and the woven fibers comprise aramid fibers. The third protective layer 4 of the present embodiment can refer to the third protective layer 4 of the above-mentioned embodiments.

[0116] The other structures of the surface grain 200 provided with the heat exchange channel 54 can refer to the surface grain 200 not provided with the heat exchange channel 54 of the above-mentioned embodiments.

[0117] The composite structure in the surface grain of the present application can refer to the embodiments of the composite structure described above.

[0118] The present application further provides a watchband, as shown in Figure 11 The structure of the watchband of the present application is shown in the following figure. Figure 11 The watchband 300 of the present embodiment comprises a plurality of mutually connected surface grains 301, 410, 501, and the surface grains 301, 410, 501 are the surface grain 200 of the above-mentioned embodiments. Since the watchband 200 adopts all the technical solutions of the above-mentioned embodiments, it also has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. It can be understood that the plurality of surface grains 301, 410, 501 can comprise male buckle connectors, female buckle connectors and a plurality of unit connectors. Among them, the structures of the plurality of surface grains 301, 410, 501 can be the same or different.

[0119] It should be noted that the composite structure 100, the surface grain 200 and the watchband 300 provided by the present application are not only used for watches and other products, but also can be used for other portable products.

[0120] The present application further provides a preparation method of a composite structure, which comprises the following steps:

[0121] Step S101: preparing a base layer.

[0122] In some embodiments, the base layer comprises a plurality of layers of second carbon fibers.

[0123] In some embodiments, the carbon fiber yarn can be used as a raw material, wound into a short length by using a rewinding machine, then wound on the knitting machine spindle, and finally put the wound spindle on the knitting machine for standby.

[0124] In some embodiments, the carbon fiber can be first impregnated with a first adhesive. The carbon fiber yarn is first tensioned along the axial direction of the winding direction by a traction machine, and then immersed in epoxy resin, and the axial yarn is collected into a pre-impregnated yarn bundle, that is, the traction bundle.

[0125] In some embodiments, the carbon fiber yarn is tensioned along the axial direction of the winding direction by a traction machine to form a solid matrix layer; or the carbon fibers extending in the axial direction are uniformly distributed on the core mold to form a hollow matrix layer.

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

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

[0128] The fiber orientation of the first carbon fiber layer of the first protective layer wound on the outside of the matrix layer is circumferential or approximately circumferential around the outer surface of the matrix layer, which can increase the tensile strength of the composite structure in the circumferential or approximately circumferential direction of the matrix layer, etc., thereby improving the resistance strength of the composite structure, having high toughness and high fracture resistance.

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

[0130] Step S102: winding a second protective layer on the outside of the first protective layer; wherein the second protective layer comprises a third carbon fiber layer, and the third carbon fiber layer is interwoven by two carbon fibers with different orientations.

[0131] The third carbon fiber layer is provided on the side of the first protective layer away from the second carbon fiber layer, and the third carbon fiber layer is interwoven by two carbon fibers with different fiber orientations, so that the fiber orientation of at least part 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, thereby further improving the tensile strength and fracture resistance of the composite structure.

[0132] The adhesives in the matrix layer, the first protective layer and the second protective layer can be synchronized or asynchronous.

[0133] In some embodiments, a 90-degree and 45-degree interwoven third carbon fiber layer is wound on the outer surface of the first carbon fiber layer to wind the interwoven fibers on the outside of the first carbon fiber layer.

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

[0135] Step S103: winding a second protective layer on the outside of the first protective layer; wherein the second protective layer comprises a third carbon fiber layer, the third carbon fiber layer is formed by intersecting weaving of two different orientations of carbon fibers; then winding a third protective layer on the outside of the second protective layer, the third protective layer comprises a fiber layer, the fiber layer comprises woven fibers, and the woven fibers comprise aramid fibers.

[0136] The aramid fiber is a fiber spun from an aromatic polyamide resin, also known as aramid fiber. The aramid fiber has a higher elongation than the carbon fiber, so that the first protective layer 20 prepared therefrom can have better toughness, i.e., better impact resistance. Therefore, relatively neat lines can be obtained on the section adjacent to the surface, and the possibility of generating carbon fiber debris can be further reduced.

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

[0138] Step S105: winding a third protective layer on the outside of the first protective layer, the third protective layer comprises a fiber layer, the fiber layer comprises woven fibers, and the woven fibers comprise aramid fibers.

[0139] The carbon fibers and the woven fibers described above can be impregnated with an adhesive synchronously or asynchronously. In asynchronous impregnation, the adhesive of each fiber can be the same or different.

[0140] The preparation method of the composite structure provided in the present application can be used to prepare the composite structure of the above-mentioned embodiments.

[0141] The present application further provides a preparation method of a surface particle, comprising: preparing a composite structure in a preparation direction of the composite structure of the above-mentioned embodiments; processing the composite structure by using a pultrusion process and / or a heating forming process to obtain a continuous carbon fiber rod or a carbon fiber tube; processing the carbon fiber rod or the carbon fiber tube by using a cutting and finishing process to obtain a semi-finished product of a surface connector; and post-processing the surface of the semi-finished product to obtain a finished product of the surface connector.

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

[0143] In some embodiments, the preparation method of the surface particle comprises:

[0144] S1: using a second carbon fiber yarn as a raw material, winding a short length by using a rewinding machine, then winding the second carbon fiber yarn on a knitting machine spindle, and finally placing the wound spindle on the knitting machine for standby.

[0145] S2: pulling the second carbon fiber yarn tight along the axial direction of the winding direction by using a traction machine.

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

[0147] S4: Circumferential carbon fiber yarns are wound on 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 braided at 90 degrees and 45 degrees on the outer surface of the first carbon fiber layer to wind the braided fiber on the outside of the first carbon fiber layer.

[0149] S6: The gathered axial, circumferential, and braided semi-impregnated fibers are pressurized and impregnated with epoxy resin.

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

[0151] S8: Dipping into the epoxy resin.

[0152] S9: The continuous carbon fiber rod is obtained by pulling and extruding in a mold heated to 150-190°C and heat forming.

[0153] S10: The carbon fiber rod is cut into standard length particles of 1 m or 2 m by a fixed length cutting machine.

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

[0155] S12: The surface of the semi-finished product is post-processed, such as grinding or spraying, to obtain a finished product.

[0156] In some embodiments, the preparation method of the tablet includes:

[0157] S10: The second carbon fiber yarn is used as a raw material, wound by a rewinding machine, wound on the knitting machine spindle, and finally put on the knitting machine for standby.

[0158] S20: The second carbon fiber yarn extending in the axial direction is uniformly distributed on the core mold.

[0159] S30: Circumferential carbon fiber yarns are wound on the outside of the yarn bundle extending in the axial direction to form a first carbon fiber layer on the outside of the yarn bundle.

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

[0161] S50: The gathered axial, circumferential, and braided semi-impregnated fibers are pressurized and impregnated with epoxy resin.

[0162] S60: The continuous carbon fiber tube is obtained by heating to 150-190°C in a mold and then performing pultrusion, heating molding.

[0163] S70: The carbon fiber tube is cut into a standard length of 1 or 2 m by a fixed-length cutting machine.

[0164] S80: The granules are cut and finished by a walking lathe to obtain a complete semi-finished product.

[0165] S90: The surface of the semi-finished product is post-processed, such as grinding or spraying, to obtain a finished product.

[0166] The above multiple finished products can be assembled into a watchband.

[0167] The above description is merely an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the specification and drawings of the present application, is also included in the patent protection scope of the present application.

Claims

1. A table grain, characterized in that, The composite structure comprises a base layer and a first protective layer arranged outside the base layer, the first protective layer comprises a first carbon fiber layer arranged outside the base layer, and the fiber orientation of the first carbon fiber layer is circumferential or approximately circumferential direction along the outer surface of the base layer.

2. The table grain of claim 1, wherein, The first carbon fiber layer is woven by at least two kinds of fiber orientation carbon fibers.

3. The table grain of claim 1, wherein, The composite structure is inwardly recessed along two sides of 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 of the circumferential direction.

4. The table grain of claim 3, wherein, The composite structure is inwardly cut along two sides of the second direction to form the body part and the lug; and along the second direction, the root of the lug extends to the base layer.

5. The table grain of claim 1, wherein, The base layer comprises a second carbon fiber layer, and 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°-90°.

6. The table grain of claim 5, wherein, The composite structure is a rod or a pipe, the base layer is a cylindrical structure, the first protective layer is an annular protective layer arranged outside the base layer, the fiber orientation of the first carbon fiber layer is along the circumferential 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.

7. The table grain of claim 5, wherein, The base layer comprises a plurality of second carbon fiber layers; and / or, The first protective layer comprises a plurality of first carbon fiber layers.

8. The table grain of claim 1, wherein, The composite structure further comprises: A second protective layer arranged outside the first protective layer, the second protective layer comprises a third carbon fiber layer, and the third carbon fiber layer is woven by intersecting two carbon fibers with different orientation directions.

9. The table grain of claim 1, wherein, The composite structure further comprises: A third protective layer arranged outside the first protective layer, the third protective layer comprises a fiber layer, and the fiber layer comprises woven fibers, and the woven fibers comprise aramid fibers.

10. The table grain of claim 8, wherein, The composite structure further comprises: A third protective layer arranged outside the second protective layer, 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 3 or 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 along 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.

12. The table grain of claim 11, wherein, The base layer is arranged as a solid cylinder, the middle lug and the two side lugs are provided with first shaft holes extending along the axial direction, and the first shaft holes are located in the base layer.

13. The table grain of claim 11, wherein, The base layer is arranged as a hollow cylinder to form a heat exchange channel in the middle, the heat exchange channel penetrates through the body part along the axial direction, and the middle lug is provided with a second shaft hole located in the base layer and communicating with the heat exchange channel.

14. The table grain of claim 13, wherein, The lower end surface of the body part is provided with a heat exchange through hole communicating with the heat exchange channel.

15. 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 1-14.

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