An upper, a knitted fabric, an article of footwear

Abstract

The application provides a shoe upper, a knitted fabric and a shoe product, the shoe upper is pulled by a yarn guide device along a preset path to interleave or cross-laminate a sheath-core structure yarn, and a heating device is used to heat the sheath-core structure yarn during the pulling process to slightly melt the surface of the sheath-core structure yarn so that the sheath-core structure yarn at the interlaced or cross-laminated position is fused together to form. According to the application, through the innovative combination of material (sheath-core structure yarn) and process (pulling-micro-fusion integration), the yarn guide device is directly used to wind and build the shoe upper along the digital preset path, and the sheath-core structure yarn is fused into a whole through the micro-fusion technology at the cross point, so that the glue-free bonding is realized, and the problems of long-term dependence on molds, material waste, design limitation and complex process in the traditional shoe manufacturing and the existing 3D knitting / winding technology are solved.

Description

Technical Field

[0001] This application relates to the field of textile technology, and more particularly to a shoe upper, woven fabric, and footwear product. Background Technology

[0002] Footwear, as a daily necessity, has undergone a long evolution in manufacturing technology, from traditional manual labor to modern industrial production. However, both traditional processes relying on mold injection, material cutting and sewing, and the emerging 3D weaving and wrapping technologies, have revealed significant limitations in meeting the growing market demands for personalization, sustainability, and efficiency.

[0003] Traditional footwear manufacturing, especially the production of shoe uppers, typically relies on the cutting, sewing, and injection molding of multiple layers of materials. This model suffers from several core problems: 1. Complex processes and significant material waste: Traditional processes are lengthy, requiring 20-30 independent steps, such as die-cutting, sewing, and high-frequency bonding. Material utilization is generally below 80%, generating a large amount of scrap waste. Studies indicate that the overall utilization rate of textile and footwear upper materials is only 75%, and in manual sewing processes, thread wastage can exceed 25%. This not only drives up production costs but also creates enormous environmental pressure. 2. Insufficient customization capabilities and production flexibility: Traditional production lines rely heavily on specific molds and fixtures, making it difficult to quickly switch between producing different shoe styles. This results in marginal costs for small-batch orders (e.g., less than 100 pairs) being 3-5 times higher than for mass production, failing to meet the current consumer market's demand for "small-batch, quick-response" and personalized customization. 3. Limited product design innovation and long R&D cycle: To achieve lightweight and breathable functions, shoe uppers often adopt hollow weave or open structure. However, to achieve a balance between aesthetic innovation and functionality (such as support and fit), complex post-processing or multi-component combination is often required, which greatly extends the product's application cycle from design to mass production. 4. High mold costs: Molds and fixtures required for key processes such as blanking, high frequency, and seamless bonding usually need to be made individually for each new product. These molds (such as steel die-cutting molds and copper molds) are very expensive. According to statistics, mold costs account for as much as 15%-25% of the total cost during the product development stage, which seriously restricts design iteration and market trial and error of new products.

[0004] To overcome the shortcomings of traditional processes, integrated molding technologies such as 3D weaving and 3D winding have emerged. Although these technologies reduce the number of stitching steps, they still have significant limitations in practical applications. While these technologies can achieve one-piece weaving of the shoe upper, their process design is limited by the loom and programming, making it difficult to achieve extremely complex three-dimensional surface variations. Furthermore, the initial process development and equipment investment remain substantial, the production preparation cycle is long, and the degree of flexibility needs to be improved. Utility Model Content

[0005] In order to solve one or more of the technical problems existing in the prior art, this application provides a shoe upper, woven fabric, and footwear product, which solves the technical problems of mold dependence, material waste, design limitations, and complicated processes that have long existed in traditional footwear manufacturing and existing 3D weaving / winding technology.

[0006] To achieve the above objectives, the technical solution adopted by this application to solve its technical problem is as follows: In a first aspect, this application provides a shoe upper, wherein the shoe upper employs a yarn guiding device to pull the core-sheath structure yarn along a preset path so that the core-sheath structure yarn is interlaced or cross-layered, and during the pulling process, a heating device is used to heat the core-sheath structure yarn so that the surface of the core-sheath structure yarn is slightly melted, thereby melting the core-sheath structure yarn at the interlaced or cross-layered locations together to form the upper.

[0007] This application proposes an innovative combination of materials (core-skin structure yarn) and processes (tension-micro-melting integration). By using a yarn guiding device to directly wind and construct the shoe upper along a digitally preset path, and using micro-melting technology at the intersection to fuse the core-skin structure yarn into a whole, achieving glue-free bonding, it solves the problems of mold dependence, material waste, design limitations, and complex processes that have long existed in traditional footwear manufacturing and existing 3D weaving / winding technologies.

[0008] In one specific embodiment, the core-sheath structure yarn includes a core layer and a surface layer covering the outside of the core layer. The core layer is composed of continuous filament fibers with a predetermined strength, and the surface layer is a thermoplastic material.

[0009] In this application, the core layer of the core-sheath structure yarn is composed of continuous filament fibers of a predetermined strength, providing the main mechanical skeleton for the shoe upper. It is responsible for bearing and dispersing various stresses during use, ensuring that the final product has excellent tensile strength and shear resistance. The thermoplastic material on the surface undergoes micro-melting under heating conditions, acting as a "natural adhesive" to melt and bond the yarns together at intersections or overlapping points.

[0010] In one specific embodiment, the cross-sectional area of ​​the core layer accounts for 20%-70% of the cross-sectional area of ​​the core-sheath structure yarn, and the cross-sectional area of ​​the outer layer accounts for 30%-80% of the cross-sectional area of ​​the core-sheath structure yarn. And / or, the thickness of the surface layer is 0.15-0.7 mm.

[0011] This application solution, by limiting the cross-sectional area ratio of the core layer and the surface layer of the core-sheath structure yarn, ensures that the core layer has sufficient volume to serve as the "load-bearing skeleton" of the shoe upper, guaranteeing the overall strength of the shoe upper, while also ensuring that the surface layer can provide sufficient and appropriate amount of thermoplastic material for the fusion bonding at the intersection.

[0012] In one specific embodiment, the thermoplastic material includes one or more of polyurethane, polyamide, or polyethylene.

[0013] In one specific embodiment, the upper includes: The first surrounding unit includes a mesh structure formed by spirally interlacing the core-sheath structure yarns at a first preset winding angle to conform to the transition contour between the upper and the sole; and / or, The second wrapping unit is formed by cross-wrapping the core-sheath structure yarn at a second preset wrapping angle; and / or The third wrapping unit is formed by spirally wrapping the core-sheath structure yarn around the arc-shaped surface of the heel support component at a third preset wrapping angle.

[0014] This application solution, by setting a first wrapping unit, a second wrapping unit, and / or a third wrapping unit, and giving them the same or different preset wrapping angles and structural forms, enables the footwear to achieve optimal connection stability, comprehensive functionality, and dynamic support in the transition area, main body area, and heel area respectively without the need for additional component combinations, truly realizing precise empowerment of product performance from the source of structural design.

[0015] In one specific embodiment, the first surrounding unit has a higher winding density at the toe-tip anti-collision area than the winding density in the adjacent area.

[0016] The present application solution uses a higher winding density in the first surrounding unit in the impact protection area corresponding to the toe tip than in the adjacent areas to form a high-strength protective zone in that area. The dense winding network forms a high-density fiber reinforcement layer, which can effectively resist external impacts and bumps, providing crucial passive protection for the toes and greatly reducing the risk of injury caused by accidental impacts during sports or daily use.

[0017] In one specific embodiment, the second wrapping unit has a higher wrapping density on the inner side of the arch than on other areas of the second wrapping unit.

[0018] The present application proposes a solution where the second wrapping unit has a higher wrapping density on the inner side of the arch than in other areas, thereby forming a stronger "support bundle" or "support surface" in that area. When the foot hits the ground, this high-density area can provide upward support to the arch from the inside out, effectively counteracting the tendency of the arch to collapse, enhancing stability during exercise, and reducing the risk of sports injuries caused by insufficient support.

[0019] In one specific embodiment, the third surrounding unit forms a locking structure at the edge of the heel support member.

[0020] The proposed solution uses a locking structure to firmly bundle and fix the fibers at the edge, forming a high-strength reinforced frame. This effectively prevents the edges from collapsing, deforming, or tearing due to long-term use, greatly improving the shape retention and overall lifespan of the shoe upper.

[0021] In one specific embodiment, the upper also has an opening area corresponding to the instep, the opening area being wrapped with the core-skin structure yarn.

[0022] In one specific embodiment, the upper is generally planar; or, the upper is generally three-dimensional.

[0023] Secondly, this application also provides a woven fabric, which includes a main structure and a fixed region. The main structure includes core-sheath structure yarns extending at least along a first direction and a second direction, which are interlaced or cross-layered. A portion of the thickness surface of the core-sheath structure yarns at the interlacing or cross-layering points is fused to form a fused structure. The solidified region includes the core-sheath structure yarn extending at least along a third direction, and at least a portion of the thickness surface of the core-sheath structure yarn extending along the third direction is fused to the fused structure, wherein the third direction is different from the first direction and the second direction.

[0024] Thirdly, this application also provides a footwear product, the footwear product including a sole and an upper connected to the sole; The shoe upper uses a yarn guiding device to pull the core structure yarn along a preset path, causing the core structure yarn to interlace or overlap. During the pulling process, a heating device is used to heat the core structure yarn, causing the surface of the core structure yarn to slightly melt, so that the core structure yarn at the interlace or overlapped points melt together to form the upper.

[0025] In one specific embodiment, a portion of the core structure yarn is wound around at least a portion of the side of the sole to connect the upper to the sole.

[0026] In one specific embodiment, a portion of the core structure yarn is wrapped around a portion of the bottom surface of the sole.

[0027] In one specific embodiment, the upper has a three-dimensional structure, and the upper is formed by winding the core-skin structure yarn onto the sole and the last. Attached Figure Description

[0028] 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.

[0029] Figure 1 These are schematic diagrams of the shoe upper structure provided in some embodiments of this application; Figure 2 This is a schematic diagram of the core-sheath structure yarn provided in some embodiments of this application; Figure 3 These are schematic diagrams of the shoe upper structure provided in other embodiments of this application; Figure 4 These are schematic diagrams of the structure of the woven fabrics provided in some embodiments of this application; Figure 5 These are schematic diagrams of the structure of footwear products provided in some embodiments of this application. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] As described in the background section, traditional footwear manufacturing and existing 3D weaving / winding technologies have long suffered from problems such as mold dependence, material waste, design limitations, and complex processes. To address one or more of these issues, this application proposes a novel shoe upper, its weaving method, the woven fabric, and the footwear product. Through an innovative combination of materials (core-sheath structure yarns) and processes (tension-micro-melting integration), the shoe upper is constructed by directly winding the yarns along a digitally preset path using a yarn guiding device. At the intersections, micro-melting technology fuses the core-sheath structure yarns into a single unit, achieving glue-free bonding. This solves the long-standing problems of mold dependence, material waste, design limitations, and complex processes in traditional footwear manufacturing and existing 3D weaving / winding technologies.

[0032] The solution of this application will now be described in detail with reference to the accompanying drawings and various embodiments.

[0033] Example 1 To achieve the solution of this application, an embodiment of this application provides a shoe upper, which is formed by weaving core-sheath structure yarns based on 3D three-dimensional winding technology. (Refer to...) Figure 1 As shown, the shoe upper uses a yarn guiding device to pull the core structure yarn 100 along a preset path so that the core structure yarn 100 is interlaced or cross-layered. During the pulling process, a heating device is used to heat the core structure yarn 100 so that the surface of the core structure yarn 100 is slightly melted, and the core structure yarn 100 at the interlaced or cross-layered points melt together to form the upper.

[0034] The shoe upper provided in this application solves long-standing technical problems in traditional footwear manufacturing and existing 3D weaving / winding technologies, such as mold dependence, material waste, design limitations, and complex processes, through an innovative combination of materials (core-skin structure yarn) and processes (tension-micro-melting integration). In practice, the core-skin structure yarn is directly wound along a digitally preset path using a yarn guiding device to construct the shoe upper, completely eliminating reliance on traditional die-cutting molds, sewing jigs, or 3D winding hook molds. This not only saves on high mold costs and production time but also transforms the shoe upper from a concept of multi-part assembly into a directly generated complete three-dimensional structure, greatly simplifying the production process and laying a solid foundation for rapid response and production of small-batch, personalized orders. Because the shoe upper is composed of a continuous core-skin structure yarn layered and interwoven, and melted into a whole at the intersections using micro-melting technology, it forms an internal, naturally transitioning mesh support structure. This integrated structure eliminates stress concentration points caused by traditional stitching processes, allowing stress to be evenly distributed along the yarn network. This significantly improves the overall integrity, durability, tear resistance, and support performance of the upper while reducing weight.

[0035] It is understood that the yarn guiding device is the core actuator for realizing the 3D three-dimensional winding molding process. It is an intelligent system that integrates precision motion control, material delivery, and tension management, and its functions include, but are not limited to, yarn feeding. In the embodiments of this application, the yarn guiding device can drive the core-sheath structure yarn 100 to move precisely along a preset trajectory in three-dimensional space according to a winding path program (i.e., a preset path) generated in advance through digital design (such as CAD / CAE model) that corresponds to the three-dimensional shape of the shoe upper, so as to construct a three-dimensional shoe upper entity from two-dimensional yarn material.

[0036] It should be noted that this application does not specifically limit the yarn guiding device. Any known yarn guiding device suitable for shoe upper weaving can be used in this application without departing from the inventive concept. For example, as an illustrative rather than restrictive illustration, the yarn guiding device in this application can be a multi-degree-of-freedom (e.g., six-axis) industrial robot arm. Its end effector integrates components such as a yarn supply and tension control module and a heating integrated nozzle. The yarn supply and tension control module includes a yarn bobbin holder, an active yarn feeder, a tension sensor, and a buffer mechanism to ensure a continuous and stable yarn supply and maintain constant yarn tension during high-speed winding, preventing excessive looseness or tightness from affecting the molding quality. The heating integrated nozzle integrates a precise temperature-controlled heating device (such as a ceramic heater), which can instantaneously and controllably heat the surface thermoplastic material of the yarn the moment it is pulled out of the nozzle, achieving a state where the surface is slightly melted but the core layer remains intact, preparing for subsequent interlayer fusion bonding.

[0037] In this embodiment, the preset path refers to the core digital instruction set that guides the yarn guiding device in three-dimensional winding motion. It is a digital intelligent solution that not only includes spatial trajectory but also integrates ergonomics, structural mechanics, materials science, and manufacturing processes. It can be understood that the preset path defines the continuous spatial coordinates, direction, and posture of the core-sheath structure yarns in digital space, determining the final macroscopic and microscopic structure of the upper. The macroscopic shape refers to the upper's shape that precisely conforms to the three-dimensional scan data of the foot, while the microscopic structure includes the density and arrangement of the yarns, the winding angle, and the layering order. These factors directly determine the physical properties of different areas of the upper.

[0038] In some specific embodiments, the preset path is pre-generated based on the shoe upper. In practice, foot biomechanical analysis can be performed first, followed by parametric modeling and path planning based on the analysis results. Foot biomechanical analysis includes, but is not limited to, identifying key areas requiring high-strength support (such as the arch and ankle), high flexibility (such as the metatarsophalangeal joint), or high breathability (such as the instep) based on data such as plantar pressure distribution and motion posture simulation. Parametric modeling and path planning can be algorithm-driven, automatically or semi-automatically generating optimized paths based on the above analysis results. For example, in high-stress areas (such as the arch), the path will be designed to be denser with smaller winding angles to form a high-modulus, strong-support mesh structure; in high-activity areas (such as the toe), the path will use specific geometric patterns to ensure flexibility and durability during bending; in breathable areas, the path will be planned with larger perforations to achieve efficient ventilation, etc., which will not be listed here.

[0039] Reference Figure 2 As shown, in some specific embodiments, the core-sheath structure yarn 100 includes a core layer 110 and a surface layer covering the core layer 100. The core layer 110 is composed of continuous filament fibers with a predetermined strength, providing the main mechanical framework for the shoe upper, responsible for bearing and distributing various stresses during use, ensuring the final product possesses excellent tensile strength, shear resistance, durability, and dimensional stability. The surface layer 120 is a thermoplastic material that can undergo micro-melting under heating conditions, acting as a "natural adhesive" to instantly melt and bond the yarns at their intersections. This design allows for the simultaneous construction and fixation of the structure in a single processing step, forming a robust overall network.

[0040] Understandably, the high-strength filaments of the core layer 110 ensure sufficient toughness and tensile strength during yarn guiding and high-speed pulling, preventing breakage due to tension and ensuring the continuity and reliability of the winding process. The thermoplastic material of the surface layer 120, after micro-melting, not only achieves effective bonding but also forms smooth knots after cooling, avoiding the stiffness and friction caused by traditional adhesives or stitching knots. This results in a smooth feel inside the molded upper and flowing lines on the outside, greatly improving the product's wearing comfort and premium feel. Through the synergy of the core and leather structure, materials can be "distributed as needed." For example, in critical load-bearing areas, the powerful mechanical properties of the core layer 110 are fully utilized through multi-layer winding; in non-critical areas, the winding density can be reduced to lighten weight. This structure, using high-strength filaments as the load-bearing body and trace amounts of thermoplastic material as connecting points, allows the final product to achieve maximum lightweighting while maintaining structural strength, perfectly meeting the stringent performance and weight requirements of modern athletic footwear.

[0041] It should be noted that the materials of the core layer 110 and the outer layer 120 can be flexibly selected and combined according to the performance requirements of the final product. For example, when pursuing lightweight and high elasticity, a nylon filament core layer with a suitable elastic modulus can be selected and paired with a low melting point TPU outer layer; when pursuing extreme strength, carbon fiber filaments can be used as the core layer.

[0042] In some specific embodiments, the filament fibers of the core layer 110 may be one or a combination of polyester, nylon, glass fiber or carbon fiber filaments.

[0043] In some specific embodiments, the surface thermoplastic material can be one or a combination of thermoplastic polyurethane elastomer (TPU) and polyamide (PA).

[0044] In this embodiment, the preset strength refers to the minimum mechanical performance requirement that the filament fibers of the core layer 110 must meet as the load-bearing skeleton of the shoe upper structure. It is mainly controlled by the selection of the core layer 110 material (such as high-modulus polyethylene, carbon fiber, glass fiber, high-strength polyester, or nylon) and its physical specifications (such as fineness and the number of monofilaments). This strength index directly determines the structural capability of the molded shoe upper when subjected to tensile, tearing, and impact loads. It should be noted that in this embodiment, the preset strength is not specifically limited; it can be set according to actual product requirements (such as the final use of the footwear, target performance level, and winding structure design). For example, professional competitive running shoes require extremely high lightweighting and energy return, and thus need very high preset strength. Materials such as carbon fiber or high-modulus polyethylene can be used to minimize deformation and improve propulsion efficiency. For everyday casual shoes, the focus is on comfort and durability, and the preset strength can be moderate. High-strength nylon or polyester can meet the requirements, while also taking into account cost and flexibility. For heavy-duty work boots or hiking boots, excellent impact resistance and tear resistance are required, and the preset strength requirement is the highest. High-performance fibers such as glass fiber or aramid can be used.

[0045] In some specific embodiments, the cross-sectional area of ​​the core layer 110 accounts for 20%-70% of the cross-sectional area of ​​the core-sheath structure yarn 100, and the cross-sectional area of ​​the surface layer 120 accounts for 30%-80% of the cross-sectional area of ​​the core-sheath structure yarn 100. In specific implementations, the specific proportion of the core layer 110 can be set according to the product design effect, yarn density, bonding requirements, and strength requirements. The specific proportion of the surface layer can be set according to the adhesive strength of the surface layer material, the design effect, yarn density, bonding requirements, and strength requirements. By setting the cross-sectional area ratio of the core layer 110 to 20%-70% and the surface layer 120 to 30%-80%, it is ensured that the core layer 110 has sufficient volume to serve as the load-bearing skeleton of the shoe upper, guaranteeing the overall strength of the shoe upper, while also ensuring that the surface layer 120 can provide sufficient and appropriate amounts of thermoplastic material for the fusion bonding at the intersections. When the proportion is less than 20%, the core layer 110 makes insufficient mechanical contribution, and the overall strength of the upper will decrease; when the proportion exceeds 70%, the material of the surface layer 120 used for bonding is relatively insufficient, affecting the connection strength. However, the surface layer 120 material within the above-mentioned proportion range can form full and strong weld points after being heated and slightly melted, ensuring the structural integrity of the yarn network and avoiding the risk of interlayer delamination or joint cracking due to insufficient bonding area.

[0046] In some specific embodiments, the thickness of the surface layer 120 is 0.15-0.7 mm. Limiting the thickness of the surface layer 120 to within the range of 0.15-0.7 mm is crucial for achieving high-quality winding. The applicant's experiments revealed that when the thickness of the surface layer 120 is less than 0.15 mm, the material is too thin, making it prone to insufficient micro-melt during heating, leading to incomplete soldering or weak connections and affecting bonding reliability. Furthermore, an excessively thin surface layer 120 weakens its protective function during high-speed yarn traction and bending, increasing the risk of wear or breakage of the filaments in the core layer 110. Conversely, if the thickness of the surface layer 120 exceeds 0.7 mm, the overall stiffness of the yarn becomes excessive, reducing its flexibility. This makes it difficult to bond when winding complex three-dimensional curved surfaces and may generate internal stress, affecting molding accuracy. In addition, an excessively thick surface layer 120 requires more heat energy to fully melt, increasing energy consumption and control difficulty.

[0047] Understandably, the specific heating temperature for the core-sheath structure yarns can be determined based on the actual thermoplastic material used in the outer layer 120. No specific limit is set here, but it is necessary to ensure that the outer layer 120 material has suitable fluidity and surface tension at this heating temperature, enabling the formation of a full, uniform melt at the intersections. After cooling and solidification, this melt generates strong adhesive force, ensuring the structural integrity of the winding network. In some specific embodiments, the heating temperature must be higher than the melting temperature of the outer thermoplastic material to ensure that the material fully melts into a viscous flow state, thereby generating sufficient molecular diffusion and entanglement at the yarn intersections to form strong and reliable weld points. Simultaneously, the heating temperature must be significantly lower than the heat distortion temperature or softening point of the filament fibers in the core layer 100, thus protecting the mechanical properties of the filament fibers in the core layer 110 from heat damage. This is because excessively high temperatures can cause the molecular chains of the core layer 110 to loosen and change crystallinity, resulting in an irreversible decrease in its tensile strength, modulus, and other key mechanical properties, ultimately weakening the overall structural strength of the shoe upper. As an illustrative and not limiting illustration, when thermoplastic polyurethane elastomer (TPU) is used for the surface layer 120, the heating temperature of the heating device can be set to 130°C-180°C.

[0048] In this embodiment, the shoe upper is functionally divided, and a wrapping unit with a specific wrapping angle is designed according to the stress characteristics and functional requirements of different areas. Further reference... Figure 1 As shown, the upper includes a first wrapping unit 200, a second wrapping unit 300, and a third wrapping unit 400. By setting the first wrapping unit 200, the second wrapping unit 300, and / or the third wrapping unit 400, the footwear can achieve optimal connection stability, comprehensive functionality, and dynamic support in the transition area, main body area, and heel area respectively without the need for additional component combinations, truly realizing precise empowerment of product performance from the source of structural design.

[0049] In some specific embodiments, the first wrapping unit 200 adopts a mesh structure formed by spirally interlacing core-sheath structure yarn 100 at a first preset winding angle to conform to the transition contour between the upper and the sole. In specific implementation, the first wrapping unit 200 can be formed by continuously wrapping around the transition contour between the last and the sole, starting from the front of the foot and wrapping around the inner and outer sides. This design makes the area both flexible and supportive. The spirally interlaced mesh can effectively disperse the stress transmitted from the sole to the upper, avoiding stress concentration. At the same time, its porous structure provides excellent physical anchor points for subsequent bonding processes (such as injection molding edging), greatly enhancing the firmness of the bond between the upper and the sole, preventing separation, and thus achieving a natural transition and stable connection between the shoe body and the sole.

[0050] In some specific embodiments, the first wrapping unit 200 has a higher wrapping density at the toe impact protection area than the adjacent areas. By using a higher wrapping density in the toe impact protection area of ​​the first wrapping unit 200, a high-strength protective zone embedded in the overall structure is essentially constructed at that location. The dense wrapping network forms a high-density fiber reinforcement layer, which can effectively resist external impacts and bumps, providing crucial passive protection for the toes and greatly reducing the risk of injury from accidental impacts during sports or daily use. Furthermore, this density gradient design avoids the bulkiness and stiffness resulting from thickening or reinforcing the entire toe area or even the entire upper to enhance protection. Maintaining a lower wrapping density in the area corresponding to the toe joint, which requires flexible bending, ensures good bending flexibility in the toe area; while the material is concentrated in the foremost impact protection area to provide rigid protection.

[0051] In some specific embodiments, the first surrounding unit 200 forms a closed-loop structure in the toe area and the back of the foot. During foot movement, the toe area and back of the foot are the main areas of width variation and stress concentration. The closed-loop structure acts like a built-in elastic band, adaptively conforming to and constraining the lateral expansion of the foot in these areas, effectively preventing unnecessary lateral movement of the foot within the shoe, greatly improving fit and stability. Furthermore, the closed-loop path evenly distributes local stress along the ring direction, avoiding stress concentration on a single yarn, significantly enhancing the fatigue and deformation resistance of these high-activity areas, and extending the service life of the shoe upper.

[0052] In some specific embodiments, the second wrapping unit 300 is formed by cross-wrapping of the core-sheath structure yarn 100 at a second preset wrapping angle. Specifically, the second wrapping unit 300 can be continuously wrapped along the vertical direction of the shoe's side cross-section. The arrangement of the second wrapping unit 300 allows the yarn network to simultaneously wrap around the inner and outer sides of the foot and the sole, greatly enhancing the lateral support rigidity of the shoe upper for the midfoot, effectively resisting abnormal slippage of the foot within the shoe during changes of direction or complex road conditions, and providing a stable, wrapping feel.

[0053] In some specific embodiments, the second wrapping unit 300, corresponding to the upper-outsole connection portion, can be wound in an "S" shape or other shape consistent with the height of the outsole side according to the outsole strip. This allows the wound fiber skeleton to achieve a high degree of fit with the edge contour of the outsole in three-dimensional space, providing a maximized and consistent contact area for subsequent bonding processes. This not only avoids voids or stress concentration points at the joint, but also upgrades the bonding between the upper and outsole from traditional surface bonding to three-dimensional skeleton interlocking, significantly improving the strength and durability of the bond and fundamentally reducing the risk of glue separation.

[0054] In other specific embodiments, the second surrounding unit 300 covers the inner and outer sides of the arch with a continuous surrounding path corresponding to the area from the heel to the instep, thereby creating a seamless and complete support bridge for the arch. This continuous structure can transmit and distribute force more efficiently: during the gait cycle, the force flow from heel strike to forefoot push-off can be smoothly transmitted through this continuous fiber network, providing dynamic and uniform support for the arch, thereby improving movement efficiency and reducing the risk of fatigue and injury due to insufficient arch support.

[0055] In some specific embodiments, the second wrapping unit 300 has a higher wrapping density on the inner side of the arch than in other areas. It is understood that the arch is a crucial structure for foot weight-bearing and jumping, requiring good support to prevent excessive pronation (overpronation) and fatigue. By making the wrapping density of the second wrapping unit 300 higher on the inner side of the arch than in other areas, on the one hand, a stronger "support bundle" or "support surface" is created in this area. When the foot lands, this high-density area provides upward support to the arch from the inside out, effectively counteracting the tendency for arch collapse, enhancing stability during movement, and reducing the risk of sports injuries caused by insufficient support. On the other hand, this design optimizes the overall performance of the upper while achieving functional support. The high-density structure on the inner side of the arch provides strong wrapping and support, while the surrounding areas and the instep, where breathability is more important, maintain a relatively lower wrapping density. This ensures that the footwear is stable and reliable in key support areas, while remaining lightweight and breathable in non-critical areas, achieving a perfect balance between wearing comfort and athletic performance.

[0056] In some specific embodiments, the third wrapping unit 400 is formed by spirally wrapping the core-sheath structure yarn 100 around the arc-shaped surface of the heel support component at a third preset wrapping angle. The third wrapping unit 400, targeting the heel as a key load-bearing and stability area, adopts a spiral wrapping method that conforms to its arc-shaped surface, perfectly fitting the complex physiological curvature of the heel and forming an adaptive support structure. It not only provides a holistic, rigid support for the heel, effectively preventing slippage during running or turning, but also, because its structure is a continuous fiber integral molding, avoids the friction points and hardness caused by traditional stitching, improving the comfort and stability of the fit.

[0057] In one specific embodiment, the third surrounding unit 400 forms a locking structure 410 at the edge of the heel support component. The heel opening edge is a critical area that is frequently subjected to friction, compression, and deformation during wear. Traditional woven or fabric uppers are prone to curling, loosening, or wear at this point. The locking structure 410 of this embodiment uses tightly wrapped yarns to firmly bundle and fix the fibers at the edge, forming a high-strength reinforced frame. This effectively prevents the edge from collapsing, deforming, or tearing due to long-term use, greatly improving the shape retention and overall lifespan of the shoe upper opening. Furthermore, the locking structure 410 makes the heel opening edge smooth, flat, and elastic, eliminating rough seams or hard material seams that may rub against the ankle. The locking structure 410 provides a soft yet stable surrounding contact surface for the ankle, enhancing the comfort of the fit. At the same time, this structure gives the product edges a clean and refined finish, showcasing a delicate appearance comparable to traditional high-end sewing techniques, enhancing the overall quality of the product.

[0058] It should be noted that the overlock structure 410 in this embodiment is integrally and continuously wound with the heel support body, eliminating the need for additional binding strips or complex sewing operations as in traditional processes. This not only simplifies the production process and eliminates the quality risks that may arise from additional processing steps, but also physically ensures a seamless connection between the edge and the main structure, avoiding peeling problems that may occur when multiple layers of materials are bonded together, and achieving a high degree of integrity from design to manufacturing.

[0059] In some specific embodiments, the upper also has an opening area 500 corresponding to the instep, which is made of a leather-core structure yarn 100 wrapped around. Specifically, the opening area 500 is continuously wrapped around the inner and outer sides of the last and outsole starting area, extending to a quarter-length of the outsole, to create a section for the instep opening. The opening area 500 at the instep constitutes a key entry point for the footwear product, ensuring ease of on and off. The use of leather-core structure yarn 100 to form a boundary structure provides a stable edge for the opening while also giving it excellent flexibility and elasticity. When the foot is placed in or removed, this wrapping structure provides sufficient expansion space; when worn, it elastically conforms to the instep curve, achieving a dynamic wrapping effect and effectively avoiding the pressure caused by excessive stiffness or insufficient support from excessive looseness in traditional uppers. This wrapping structure also serves as a functional transition bridge between the high-support upper and the open opening. It effectively transfers and disperses the concentrated stress (such as the force generated by tightening the laces or the movement of the instep) in the opening area 500 to the surrounding denser upper structure through the wrapped yarn, avoiding the concentration of stress at the opening edge, thereby greatly reducing the risk of edge tearing and improving the durability of the product.

[0060] In some specific embodiments, the opening area 500 can be tightly wound according to the tension-adjustable design and then backwound to the reserved shoelace channel. This tension-adjustable tight winding provides localized reinforcement to the area around the shoelace eyelet, where stress is most concentrated, far exceeding the strength of the main upper. This ensures that even when the shoelaces are pulled very tight, the opening edge will not tear or undergo irreversible deformation, guaranteeing the reliability and durability of the adjustment system. Simultaneously, the shoelace channel formed by the backwound is seamlessly integrated with the upper itself, completely avoiding the friction, noise, or added weight that may result from traditional stitching or metal shoelace eyelets. It not only provides a sleek appearance but also ensures smooth comfort in the area in contact with the instep.

[0061] In some specific embodiments, the upper has a three-dimensional structure, such as... Figure 1 As shown, a three-dimensional structure refers to the upper being directly wound and formed onto a three-dimensional shoe last (whether a physical mold or a virtual support) in a single process. The formed upper immediately possesses its final three-dimensional shape, requiring little or no post-heat setting treatment. This method eliminates the separate planar manufacturing and subsequent heat setting processes, achieving one-step production from yarn to the final finished upper, significantly shortening the production cycle and improving efficiency. Furthermore, because the yarn is tensioned and fixed in its final three-dimensional form, its fiber orientation and tension distribution perfectly match the actual wearing conditions of the shoe. This avoids the uneven stress distribution or localized relaxation problems that may occur with planar heat setting, resulting in a more stable three-dimensional upper structure, superior mechanical properties, and a more natural fit.

[0062] In other specific embodiments, the upper is generally planar in structure, such as... Figure 3 As shown, a planar structure refers to a shoe upper whose final form after winding is a roughly flat two-dimensional sheet. Its three-dimensional shape is achieved through a subsequent heat-setting process. That is, a planar prototype of the shoe upper is first created on a two-dimensional planar mold or platform using 3D winding technology. Then, it is placed in a mold with a three-dimensional last shape, and through heating and pressurization, it is permanently deformed into the final three-dimensional shoe upper. Planning and controlling the winding path on a plane is far simpler than on a complex three-dimensional mold. This reduces the requirements for the freedom of movement and precision of the yarn guiding equipment, allowing for the use of lower-cost, simpler two-dimensional or 2.5-axis motion platforms. Furthermore, the planar shoe upper blank can be stacked and wound like traditional shoe upper materials, greatly facilitating logistics, warehousing, and management between centralized production and distributed assembly, saving space.

[0063] In some specific embodiments, the first preset winding angle is 15°-45°; and / or, the second preset winding angle is 15°-35°; and / or, the third preset winding angle is 15°-35°. The winding angle generally refers to the angle between the yarn direction and the main axis of the shoe body, and is a key parameter determining the mechanical properties of the mesh structure. Generally speaking, the smaller the winding angle (e.g., approaching 15°), the closer the yarn direction is to the main axis (e.g., the longitudinal direction of the shoe), resulting in a structure with higher tensile modulus and strength along the main axis direction (e.g., the forward direction when running), providing excellent propulsion efficiency and longitudinal stability, but relatively lower lateral extensibility. The larger the angle (e.g., approaching 35°-45°), the more multidirectional the yarn direction, resulting in a structure with higher isotropy and more balanced mechanical properties in different directions, providing better multidimensional wrapping and adaptability, but the longitudinal rigidity will be correspondingly weakened.

[0064] In some specific embodiments, the yarn spacing between the core-sheath structure yarns 100 of the first wrapping unit 200 and / or the second wrapping unit 300 is 0.6-2 mm. It is understood that yarn spacing refers to the distance between the center lines of adjacent parallel yarns. By adjusting the yarn spacing between the core-sheath structure yarns 100 of the first wrapping unit 200 and / or the second wrapping unit 300, the balance between breathability, lightweight, mechanical strength, and manufacturing efficiency of the shoe upper can be adjusted. Too small a yarn spacing will result in overly dense cross-points, potentially causing accumulation of hot-melt material, excessive structural rigidity, decreased breathability, and unnecessary weight increase. Too large a yarn spacing will create excessively large mesh, significantly weakening local structural strength, support, and abrasion resistance, making it difficult to meet the basic wearing requirements of the shoe upper. In this embodiment, the yarn spacing between the core-sheath structure yarns 100 of the first wrapping unit 200 and / or the second wrapping unit 300 is set to 0.6-2mm. This ensures smooth airflow, providing excellent breathability and heat dissipation to avoid stuffiness, while also ensuring that the yarn network has sufficient density to provide continuous and uniform lateral support and wrapping for the feet, avoiding the instability that may result from sparse mesh.

[0065] Example 2 This application also provides a woven fabric, as shown in the reference. Figure 4As shown, the woven fabric includes a main structure 10 and a fixed region 20. Both the main structure 10 and the fixed region 20 are formed of core-sheath structure yarns. The core-sheath structure yarns of the main structure 10 extend at least along a first direction and a second direction, and the core-sheath structure yarns in the first and second directions are interlaced or cross-layered, with a portion of the thickness surface of the core-sheath structure yarns at the interlacing or cross-layering points fused to form a fused structure 30. The core-sheath structure yarns of the fixed region 20 extend at least along a third direction, and at least a portion of the thickness surface of the core-sheath structure yarns extending along the third direction is fused to the main structure 10. Here, "partial thickness surface" refers to the radial thickness of a portion of the outer surface of the core-sheath structure yarn. Taking a core-sheath structure yarn comprising a core layer and a surface layer covering the core layer as an example, the partial thickness surface refers to the radial thickness of a portion of the outer surface of the surface layer.

[0066] It's important to clarify that "partial thickness surface" refers to the radial portion of the outer surface of a core-sheath structure yarn. The outer surface refers to the part of the yarn that is in direct contact with the outside environment (air, other yarns, mechanical parts), and this is the primary area where friction, wear, pilling, and optical reactions occur. "Radial" is a geometric concept from the perspective of the yarn's cross-section; it refers to the direction from the yarn's center to its outer edge. Radial thickness here can be understood as a depth or distance extending radially inward from the outer surface of the yarn. "Partial thickness" does not refer to the entire radius of the yarn, nor the total thickness of the "sheath" layer, but rather to a localized, incomplete depth on the outer surface. Taking a core-sheath structure yarn, which includes the core layer and the outer layer covering the core, as an example, the partial thickness surface refers to the radial portion of the outer surface of the outer layer.

[0067] It should be noted that in the embodiments of this application, the first direction and the second direction may be the same or different, but the third direction may be different from the first direction and the second direction. For example, when the first direction and the second direction are the same, the core-sheath structure yarns extending along the first direction and the second direction are stacked; when the first direction and the second direction are different, the core-sheath structure yarns extending along the first direction and the second direction are interlaced or crossed.

[0068] It should also be noted that the first direction, the second direction, and the third direction in the embodiments of this application refer to the yarn path of the core-sheath structure. Therefore, the first direction, the second direction, and the third direction can be a single direction or a curved direction, such as an arc direction.

[0069] Further reference Figure 4As shown, the first, second, and third directions are all different directions. The first and second directions are set at an angle (including but not limited to being perpendicular to each other). The core-sheath structure yarns extending along the first direction and the core-sheath structure yarns extending along the second direction intersect to form a mesh structure. At the same time, the surface of the core-sheath structure yarns at the intersection is heated and melted to form a fusion structure 30. Since the fusion structure 30 only occurs at the contact point of the core-sheath structure yarns, the fusion structure 30 does not cover a large area of ​​the mesh of the woven fabric. Therefore, it can achieve strength while preserving the inherent porous structure of the woven fabric to the maximum extent. This allows the product to maintain its lightweight, breathable, liquid-permeable, or easily composite properties with other materials after reinforcement. In addition, compared with traditional bonding methods such as knotting, wrapping, or gluing, the fusion structure 30 is a molecular-level fusion, forming a connection point with high strength and good fatigue resistance. It can effectively prevent yarn slippage and wear at the intersection point, thereby significantly improving the tear resistance, abrasion resistance, and overall service life of the woven fabric.

[0070] In some specific embodiments, when forming the main structure 10, a yarn guiding device can be used to pull the core-sheath structure yarn along a first direction and / or a second direction, causing the core-sheath structure yarn to interlace or overlap. During the pulling process, a heating device is used to heat the core-sheath structure yarn, causing the surface of the core-sheath structure yarn to slightly melt, thus melting the core-sheath structure yarns at the interlace or overlapped points together to form a fused structure 30. The relevant processes or contents can be referred to in Embodiment 1, and will not be repeated here. Similarly, the solidification region 20 can also use a yarn guiding device to pull the core-sheath structure yarn along a third reverse direction, causing the core-sheath structure yarn to wrap around the main structure 10, interlace or overlap with the core-sheath structure yarn of the main structure 10. At the same time, during the pulling process, a heating device is used to heat the core-sheath structure yarn, causing the surface of the core-sheath structure yarn to slightly melt, thus melting the core-sheath structure yarns at the interlace or overlapped points together, thereby achieving the connection between the solidification region 20 and the main structure 10. The solidification zone 20 effectively resists deformation and loosening caused by external forces, ensuring that the product maintains its preset shape for a long time during use, thus achieving structural stability and shape retention.

[0071] It should be noted that in this embodiment, the solid region 20 may include one region or multiple regions, and the specific settings can be made according to the actual needs of the product. No specific limitation is made here.

[0072] It should be noted that the core-sheath structure yarn in this embodiment can be the core-sheath structure yarn described in Embodiment 1, that is, the core-sheath structure yarn includes a core layer and a surface layer covering the core layer. The core layer is composed of continuous filament fibers with a preset strength, and the surface layer is a thermoplastic material that can undergo micro-melting under heating conditions, thereby forming a fused structure 30. In some specific embodiments, the core-sheath structure yarn used in the main structure 10 has the same relevant parameters as the core-sheath structure yarn used in the solidification region 20; in other specific embodiments, the core-sheath structure yarn used in the main structure 10 has different relevant parameters than the core-sheath structure yarn used in the solidification region 20.

[0073] It should be noted that the woven fabric provided in this application embodiment can be used to prepare shoe uppers as described in Embodiment 1, and can also be applied to other products, such as smart knee pads, wrist supports, waist supports, sports bandages, sportswear, etc., which will not be listed here.

[0074] Example 3 Corresponding to Embodiment 1 or 2 above, this application also provides a footwear product, referring to... Figure 5 As shown, the footwear product includes a sole 600 and an upper connected to the sole; the upper is constructed by using a yarn guiding device to pull the core-skin structure yarns along a preset path, causing the core-skin structure yarns to interlace or overlap, and during the pulling process, a heating device is used to heat the core-skin structure yarns, causing the surface of the core-skin structure yarns to slightly melt, thus melting the core-skin knot yarns at the interlacement or overlap to form a knot. In this embodiment, the content that is the same as or similar to that in Embodiment 1 or 2 above can be referred to the above description, and will not be repeated hereafter.

[0075] Further reference Figure 5 As shown, in some specific embodiments, some of the core-sole yarns are wound around at least a portion of the side of the sole to connect the upper to the sole. It should be noted that, in this embodiment, to achieve efficient connection between the upper and sole 600, some of the core-sole yarns are fixed to at least a portion of the side of the sole by winding or wrapping during or after the upper is formed. One end of these core-sole yarns essentially constitutes part of the upper, while the other end is wound around the side of the sole. During the winding process, a heating device is used to heat the core-sole yarns, causing the surface of the yarns to slightly melt and fuse with the sole material (such as polymer, foam material, etc.) to form a tight mechanical interlock or physical bond. This connection method is not a traditional adhesive or stitching, but rather, through the path and structure of the core-sole yarns themselves, a reinforced "anchor point" or "connecting ring" is formed on the side of the sole, thereby firmly anchoring the upper to the sole.

[0076] It is understood that the sides of the sole include, but are not limited to, the inner side, the outer side, the side surface of the sole corresponding to the toe, and the side surface of the sole corresponding to the heel.

[0077] In some specific embodiments, a portion of the core-shell structure yarn is wrapped around a portion of the sole's bottom surface. The core-shell structure yarn constituting the upper is further extended and wrapped around a portion of the outsole area. During the winding process, a heating device is used to heat the core-shell structure yarn, causing its surface to slightly melt and fuse together with the portion of the sole's bottom surface to form a strong physical-mechanical bond, further improving the connection strength between the sole and the upper.

[0078] In some specific embodiments, the upper has a three-dimensional structure, and the upper is formed by winding the core-sheath structure yarn onto the sole and last. That is, the upper is not pre-manufactured independently and then assembled with the sole; instead, the core-sheath structure yarn is directly used as the basic building material, and is integrally formed in one go on a pre-placed last and a pre-formed sole using a three-dimensional winding method. Specifically, through advanced CNC weaving technology, the core-sheath structure yarn is interwoven and wound at multiple angles and levels within the three-dimensional space defined by the last, following a preset path. While constructing the three-dimensional structure of the upper, the ends or specific parts of these core-sheath structure yarns directly extend and wrap around and anchor to the sides or even part of the sole, thus naturally achieving a firm connection between the upper and sole during the forming process, forming a complete and seamless shoe body. This completely eliminates the additional materials such as glue, stitching, and reinforcing strips required for traditional upper and sole splicing. The entire shoe body is made of almost a single material, leather core yarn, achieving extreme structural simplification and weight reduction, while avoiding potential breakage or wear problems caused by seams.

[0079] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0080] The technical solution provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A shoe upper, characterized in that, The shoe upper uses a yarn guiding device to pull the core structure yarn along a preset path, causing the core structure yarn to interlace or overlap. During the pulling process, a heating device is used to heat the core structure yarn, causing the surface of the core structure yarn to slightly melt, so that the core structure yarn at the interlace or overlapped points melt together to form the upper.

2. The shoe upper according to claim 1, characterized in that, The core-sheath structure yarn includes a core layer and a surface layer covering the outside of the core layer. The core layer is composed of continuous filament fibers with a predetermined strength, and the surface layer is a thermoplastic material.

3. The shoe upper according to claim 2, characterized in that, The cross-sectional area of ​​the core layer accounts for 20% - 70% of the cross-sectional area of ​​the core-sheath structure yarn, and the cross-sectional area of ​​the outer layer accounts for 30% - 80% of the cross-sectional area of ​​the core-sheath structure yarn. And / or, the thickness of the surface layer is 0.15-0.7 mm.

4. The shoe upper according to claim 2, characterized in that, The thermoplastic material includes one or more of polyurethane, polyamide, or polyethylene.

5. The shoe upper according to any one of claims 1 to 4, characterized in that, The shoe upper includes: The first surrounding unit includes a mesh structure formed by spirally interlacing the core-sheath structure yarns at a first preset winding angle to conform to the transition contour between the upper and the sole; and / or, The second wrapping unit is formed by cross-wrapping the core-sheath structure yarn at a second preset wrapping angle; and / or The third wrapping unit is formed by spirally wrapping the core-sheath structure yarn around the arc-shaped surface of the heel support component at a third preset wrapping angle.

6. The shoe upper according to claim 5, characterized in that, The first surrounding unit has a higher winding density at the toe-tip anti-collision area than the winding density in the adjacent area.

7. The shoe upper according to claim 5, characterized in that, The second wrapping unit has a higher wrapping density on the inner side of the arch than other areas of the second wrapping unit.

8. The shoe upper according to claim 5, characterized in that, The third surrounding unit forms a locking structure at the edge of the rear support component.

9. The shoe upper according to any one of claims 1 to 4, characterized in that, The upper also has an opening area corresponding to the instep, the opening area being wrapped with the core-skin structure yarn.

10. The shoe upper according to any one of claims 1 to 4, characterized in that, The upper is generally planar; or, the upper is generally three-dimensional.

11. A woven fabric, characterized in that, The woven fabric includes a main structure and a fixed region. The main structure is formed by interlacing or cross-layering core-sheath structure yarns extending at least along a first direction and a second direction. A portion of the thickness surface of the core-sheath structure yarns at the interlacing or cross-layering points is fused to form a fused structure. The solidification region includes core-sheath structure yarns extending at least along a third direction, and at least a portion of the thickness surface of the core-sheath structure yarns extending along the third direction is fused to the main structure, the third direction being different from the first direction and the second direction.

12. A footwear product, characterized in that, The footwear product includes a sole and an upper attached to the sole; The shoe upper uses a yarn guiding device to pull the core structure yarn along a preset path, causing the core structure yarn to interlace or overlap. During the pulling process, a heating device is used to heat the core structure yarn, causing the surface of the core structure yarn to slightly melt, so that the core structure yarn at the interlace or overlapped points melt together to form the upper.

13. The footwear product according to claim 12, characterized in that, Some of the core structure yarns are wound around at least a portion of the side of the sole to connect the upper to the sole.

14. The footwear product according to claim 13, characterized in that, Some of the core-shell structure yarns are wrapped around a portion of the bottom surface of the shoe sole.

15. The footwear product according to any one of claims 12 to 14, characterized in that, The upper has a three-dimensional structure, and the upper is formed by winding the core-skin structure yarn onto the sole and the last.

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