High-heeled shoe carbon plate insole, high-heeled shoe and preparation method of high-heeled shoe carbon plate insole

Abstract

The invention provides a high-heeled shoe carbon plate insole, a high-heeled shoe and a preparation method of the high-heeled shoe carbon plate insole, and belongs to the technical field of shoe manufacturing. Comprising a flexible buffer layer and a rigid support layer which are stacked from top to bottom, the rigid supporting layer comprises a carbon fiber plate, and the carbon fiber plate extends in the shoe length direction and covers the area from the half sole to the heel. The flexible buffer layer comprises foaming EVA, and the foaming EVA is arranged on the carbon fiber plate. The carbon fiber plate and the supercritical foaming EVA are compounded and applied to the insole of the high-heeled shoe, so that the synergistic interaction of rigid supporting and flexible cushioning is realized, and the stability, the energy resilience and the long-time wearing comfort of the high-heeled shoe are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of shoe manufacturing, and particularly relates to a high-heeled shoe carbon plate insole, a high-heeled shoe and a high-heeled shoe carbon plate insole preparation method. BACKGROUND

[0002] As an important category in women's daily wear, high-heeled shoes have long been pursuing aesthetics and fashion while sacrificing comfort and functionality.

[0003] The traditional high-heeled shoe insole is made of a single material (such as ordinary EVA, PU or rubber) structure, which lacks sufficient rigidity support and dynamic shock absorption capacity, resulting in foot pressure concentrated on the forefoot when wearing, which can easily cause plantar fasciitis, foot arch collapse and unstable walking, etc. Especially in the case of high shoe heels (more than 60mm), the body center of gravity is tilted forward, which aggravates the burden on the foot and seriously affects the comfort and safety of long-term wear. Although some products try to introduce steel or plastic support sheets to enhance stability, there are still defects such as heavy weight, poor elasticity and insufficient anti-torsion performance. SUMMARY

[0004] In order to solve at least one aspect of the technical problems in the background art, the application provides a high-heeled shoe carbon plate insole, which realizes the synergistic effect of rigid support and flexible shock absorption by applying carbon fiber plate and supercritical foaming EVA to the high-heeled shoe insole, significantly improving the stability, energy rebound performance and long-term wear comfort of the high-heeled shoe.

[0005] The second aspect embodiment of the application provides a high-heeled shoe.

[0006] The third aspect embodiment of the application provides a high-heeled shoe carbon plate insole preparation method.

[0007] The technical solution adopted by the application is: The first aspect embodiment of the application provides a high-heeled shoe carbon plate insole, which comprises: a flexible cushioning layer and a rigid support layer stacked from top to bottom; The rigid support layer comprises a carbon fiber plate, and the carbon fiber plate extends along the shoe length direction and covers the forefoot to the heel area. The flexible cushioning layer comprises foaming EVA, and the foaming EVA is arranged on the carbon fiber plate.

[0008] According to the high-heeled shoe carbon plate midsole structure provided by the first aspect of the present application, the flexible buffer layer and the rigid support layer are stacked from top to bottom, wherein the rigid support layer adopts a carbon fiber plate extending along the shoe length direction and covering the forefoot to the heel area, and the flexible buffer layer adopts a foamed EVA material arranged on the carbon fiber plate. The structure design realizes the multi-level technical synergy effect. The carbon fiber plate as the rigid support layer has the characteristics of high strength, high modulus and light weight, can effectively resist the arch collapse trend of high-heeled shoes due to the forward inclination of the center of gravity during wearing, provide excellent bending stiffness and torsional stability, significantly enhance the overall structural strength of the midsole, and prevent the midsole from deforming or fatigue fracture in long-term use. At the same time, the continuous layout from the forefoot to the heel helps the linear conduction and distribution of force, improves the propulsion efficiency and gait stability during walking. The foamed EVA flexible buffer layer arranged thereon uses its good compression resilience and soft touch to form a buffer transition layer between the sole and the hard carbon plate, effectively absorbs the impact energy from the ground during walking or standing, reduces the peak pressure of the sole, and improves the comfort of wearing. The direct composite of the upper and lower two layers of materials reasonably separates the rigid support and flexible damping functions in space and closely cooperates in structure: the upper layer is responsible for fitting the foot shape, dispersing pressure and providing dynamic resilience, and the lower layer focuses on structure shaping, force transmission and stability control, avoiding the contradiction between support and comfort in traditional single-material midsoles. The layered structure not only optimizes the mechanical response characteristics of the midsole, but also realizes the unity of light weight and high performance through precise division of material functions, thereby fundamentally improving the functional performance of high-heeled shoes without changing their appearance.

[0009] According to an embodiment of the present application, the medial arch area of the flexible buffer layer is formed with a support part upwardly protruding, for providing dynamic support to the medial arch.

[0010] According to an embodiment of the present application, the heel area of the carbon fiber plate is upwardly curved to form an arc-shaped structure adapted to the back of the high-heeled shoe.

[0011] According to an embodiment of the present application, the foamed EVA is supercritical foamed EVA, and the density of the supercritical foamed EVA is 0.15-0.25 g / cm3, and the resilience rate is ≥65%.

[0012] According to an embodiment of the present application, the thickness of the carbon fiber plate is 0.8-1.5 mm, and a bending line or a thinning groove is arranged in the forefoot bending area of the carbon fiber plate.

[0013] The second aspect of the present application provides a high-heeled shoe, comprising: an upper, an outsole and the high-heeled shoe carbon plate midsole of any one of the first aspect embodiments described above; The flexible buffer layer of the high-heeled shoe carbon plate insole directly contacts with the insole or the shoe cavity.

[0014] According to an embodiment of the present application, the height of the heel of the high-heeled shoe is 60-120 mm, and the thickness of the high-heeled shoe carbon plate insole gradually increases from the forefoot to the heel.

[0015] The third aspect of the present application provides a high-heeled shoe carbon plate insole preparation method for manufacturing the high-heeled shoe carbon plate insole in any one of the embodiments of the first aspect, comprising: Based on the foot shape database modeling, the upper mold for pressing the flexible buffer layer and the lower mold for pressing the rigid support layer are determined; The carbon fiber prepreg is laid in the lower mold, and the carbon fiber plate is obtained by hot pressing; The supercritical foaming EVA particles are injected into the upper mold, and the foaming EVA is combined with the carbon fiber plate in the composite mold by integral molding.

[0016] According to an embodiment of the present application, the method further comprises: After demolding, the trimming treatment is performed to obtain the high-heeled shoe carbon plate insole with a layered composite structure.

[0017] According to an embodiment of the present application, the temperature of the integral molding is 120-160℃, the pressure is 5-10 MPa, and the time is 3-8 minutes. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings: Figure 1 The flow and intention of the high-heeled shoe carbon plate insole preparation method provided by the embodiments of the present application are provided. DETAILED DESCRIPTION

[0019] In order to more clearly explain the overall concept of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0020] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment can be combined with each other without conflict.

[0021] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0024] The first aspect of this application provides a carbon fiber plate midsole for high-heeled shoes, comprising: A flexible buffer layer and a rigid support layer are stacked from top to bottom; The rigid support layer includes a carbon fiber plate that extends along the length of the shoe and covers the area from the forefoot to the heel. The flexible buffer layer includes foamed EVA, which is placed on top of a carbon fiber plate.

[0025] The flexible cushioning layer refers to a material located on the upper part of the midsole, directly or indirectly in contact with the sole of the foot. It possesses good elasticity, compression deformation capacity, and energy absorption properties. Its main function is to cushion the impact force on the sole of the foot during walking or standing, thereby improving wearing comfort. In this design, this layer is made of foamed EVA, which is soft, lightweight, and has good resilience, allowing it to conform to the shape of the sole and distribute localized pressure.

[0026] The rigid support layer refers to the hard layer located in the lower part of the midsole, which provides structural strength and mechanical stability. Its main function is to resist the bending and torsional deformation of the midsole under stress, enhancing the overall rigidity and fatigue resistance of the sole. In this design, this layer is made of carbon fiber plates, which have the advantages of high specific strength, high specific modulus, and lightweight, effectively supporting the arch of the foot, preventing excessive pronation or supination, and improving the walking stability of high heels.

[0027] The two are stacked and fixedly connected in the vertical direction to form a composite structure that is "soft on top and hard on the bottom". This layout ensures both the softness and comfort of the sole contact surface and the structural support of the bottom of the shoe, which meets the physiological needs of the human foot's force distribution.

[0028] Carbon fiber plate is a high-strength, lightweight sheet material made of carbon fiber and resin composite. In this design, the plate serves as the core material of the rigid support layer, exhibiting excellent bending stiffness and torsional resistance. Its "extending along the length of the shoe and covering the forefoot to heel area" means that the plate extends from the front of the foot to the heel, forming a continuous longitudinal support structure that facilitates force transmission and distribution, improving gait stability and propulsion efficiency. The length of the carbon fiber plate spans the entire main stress area of ​​the sole, from the forefoot to the heel, achieving full-length support and preventing stress concentration or structural fracture caused by insufficient local support.

[0029] EVA (ethylene-vinyl acetate copolymer) is a commonly used shoe material. After foaming, it becomes a lightweight, porous, elastic material. Foamed EVA is characterized by low density, good cushioning, and ease of processing and molding. In this design, it serves as the main flexible cushioning layer, placed on top of a carbon fiber plate, to absorb shock, provide rebound, and enhance comfort.

[0030] The foamed EVA layer is located on the upper surface of the carbon fiber sheet. The two can be combined by means of bonding, hot pressing or integral molding to form a strong overall structure, ensuring that no interlayer peeling or relative sliding occurs during use.

[0031] According to the carbon fiber plate midsole structure for high-heeled shoes provided in the first aspect of this application, a flexible cushioning layer and a rigid support layer are stacked from top to bottom. The rigid support layer is made of carbon fiber plate extending along the length of the shoe and covering the area from the forefoot to the heel. The flexible cushioning layer is made of foamed EVA material disposed on the carbon fiber plate. This structural design achieves a multi-layered technological synergy effect. As a rigid support layer, the carbon fiber plate has the characteristics of high strength, high modulus, and lightweight. It can effectively resist the tendency of arch collapse caused by forward tilting of the center of gravity during the wearing of high heels, providing excellent bending stiffness and torsional stability, significantly enhancing the overall structural strength of the midsole, and preventing deformation or fatigue fracture of the midsole during long-term use. At the same time, its continuous layout from the forefoot to the heel helps the linear transmission and distribution of force, improving propulsion efficiency and gait stability during walking. The foamed EVA flexible cushioning layer, placed on top, utilizes its excellent compression and rebound performance and soft touch to form a buffer transition layer between the sole of the foot and the rigid carbon plate. This effectively absorbs impact energy from the ground during walking or standing, reducing peak pressure on the sole and improving wearing comfort. The direct composite of the two layers allows for a spatially rational separation and structurally close collaboration between rigid support and flexible cushioning: the upper layer is responsible for conforming to the foot shape, distributing pressure, and providing dynamic rebound, while the lower layer focuses on structural shaping, force transmission, and stability control. This avoids the contradiction of traditional single-material midsoles struggling to balance support and comfort. This layered structure not only optimizes the mechanical response characteristics of the midsole but also achieves a balance between lightweight and high performance through the precise division of material functions, fundamentally improving the functionality of the high heel without altering its appearance.

[0032] In some embodiments of this application, the inner arch region of the flexible buffer layer has an upwardly raised support portion for providing dynamic support to the inner arch.

[0033] The medial arch area refers to the middle of the inner side of the sole of the foot, corresponding to the arch. It is a key area for weight-bearing and cushioning of the foot, especially bearing greater pressure when standing and walking.

[0034] The upward-raised support refers to the part located on the inner side of the flexible cushioning layer, corresponding to the arch of the foot. Through structural design (such as molding), it forms a locally raised arc or dome-shaped structure. Its height and curvature are ergonomically optimized so that it can be embedded and fit the lower edge of the arch of the foot.

[0035] Dynamic support refers to the support that not only provides support when standing statically, but also provides continuous elastic support during walking as the foot moves (such as the compression and rebound of the arch), preventing excessive arch collapse (i.e., the tendency of "flat feet") and maintaining the natural biomechanical state of the foot.

[0036] When wearing high heels, the body's center of gravity shifts forward, placing a greater vertical load on the arch of the foot. This can easily lead to excessive collapse of the medial arch, causing problems such as plantar fasciitis and arch fatigue. This solution addresses this by creating a raised support section in the medial arch area of ​​the EVA layer. This creates a precise structural match between the sole and midsole, providing continuous upward support to the medial arch, effectively inhibiting excessive deformation of the arch under stress, maintaining the physiological curvature of the arch, and significantly improving foot stability within the shoe.

[0037] Traditional high-heeled shoes often have flat or simple curved midsoles, lacking effective support in the arch area, causing pressure to concentrate in the forefoot and heel. This support section uses a locally raised structure to rationally transfer some of the foot pressure from high-stress areas (such as the forefoot) to the arch area, achieving even pressure distribution, reducing local pressure, and reducing fatigue, making it particularly suitable for long-term wear.

[0038] Because the support structure is made of elastic materials such as foamed EVA, its raised structure has a certain compression and rebound capability. During walking, the arch of the foot periodically presses down and rebounds with each step, and the support structure can undergo elastic deformation accordingly. This provides support without hindering the natural movement of the foot, achieving a dynamic support effect that combines rigidity and flexibility, and avoiding the pressure or movement restriction problems caused by rigid support.

[0039] In some embodiments of this application, the heel area of ​​the carbon fiber plate is curved upward to form an arcuate structure adapted to the back of a high-heeled shoe.

[0040] The heel area of ​​the carbon fiber plate refers to the part of the carbon fiber plate located at the back of the midsole, corresponding to the heel position. It is a key structural area that supports the weight of the human body and absorbs the impact of landing.

[0041] The upward curve refers to the fact that the carbon fiber plate in this area is not flat in three dimensions, but rather curves upward (i.e. towards the foot) along the edge of the midsole or as a whole, forming a structure similar to a "cup" or "embracing".

[0042] The arc-shaped structure refers to the raised part having a continuous and smooth curved surface shape, whose curvature matches the inner cavity contour of the back of the high heel, thus achieving structural fit and mechanical coordination.

[0043] The heel counter refers to the rigid support structure at the back of the upper of a high-heeled shoe. It is usually made of plastic, composite materials, or reinforced fabric and is used to wrap and secure the heel, preventing the foot from sliding inside the shoe.

[0044] High heels, due to their raised heels, make the foot prone to sliding forward and backward while walking, leading to blisters, slipping, and even sprains. This solution uses a carbon fiber plate to create an upward-curving arc structure in the heel area, which, together with the heel counter, forms a "cup-shaped support cavity." This cavity provides three-dimensional support and lift to the heel bone area from below, effectively limiting the heel's vertical and horizontal movement within the shoe, significantly improving the "heel lock-in" feel, and enhancing wearing safety and stability.

[0045] The raised, curved carbon fiber structure extends to the rear side of the midsole, effectively adding lateral and vertical structural extensions to the traditional flat carbon plate, enhancing the overall rigidity of the rear midsole. This structure works in conjunction with the heel counter to form a composite support system of "inner plate + outer shell," significantly improving the shoe's torsional resistance, preventing twisting and deformation during walking, and improving gait consistency.

[0046] In some embodiments of this application, the foamed EVA is supercritical foamed EVA, and the density of supercritical foamed EVA is 0.15~0.25g / cm³, and the resilience is ≥65%.

[0047] Supercritical foamed EVA refers to an advanced process that uses supercritical fluids (such as supercritical nitrogen or carbon dioxide) as foaming agents to foam EVA materials under high temperature and high pressure supercritical conditions. This technology can achieve a more uniform and denser closed-cell structure, significantly improving material performance.

[0048] A density of 0.15~0.25 g / cm³ indicates the mass range per unit volume of the material. This range falls into the category of ultralight foamed materials, far lower than traditional EVA (typically 0.30~0.45 g / cm³), meaning it is lighter for the same volume.

[0049] A resilience rate of ≥65% refers to the ratio of energy released when a material returns to its original shape after being compressed to the energy input. The higher the resilience rate, the less energy loss, and the stronger the material's "elasticity." The resilience rate of ordinary EVA is generally 40%~50%, while ≥65% is considered a high-performance level.

[0050] The ultra-low density (0.15~0.25g / cm³) of EVA material makes it extremely lightweight. Combined with the lightweight properties of carbon fiber plates, this significantly reduces the overall weight of the midsole in high heels. This is especially important for high heels—traditional high heels often suffer from a "top-heavy" or "heavy" feel due to their heavy structure. This solution effectively alleviates this problem, enhancing the "unfeeling" wearing experience, making it particularly suitable for long periods of walking or standing.

[0051] A rebound rate of ≥65% means that after each foot pressure, the material can convert most of the impact energy into rebound force to return to the foot, forming a dynamic response of "soft when stepped on, quick when bounced back". This high rebound characteristic can reduce the need for muscles to actively exert force to maintain balance, reduce foot and leg fatigue, and make the wearer feel "easier and easier to walk", significantly improving the dynamic comfort of high heels.

[0052] The supercritical foaming process creates a uniform micropore structure with a high closed-cell rate, giving the material superior compression cushioning capabilities. In the high center of gravity of high heels, the heel and forefoot bear significant impact forces. This EVA layer efficiently absorbs ground reaction forces, reducing impact on the plantar fascia, knee joints, and spine, thus preventing sports injuries and chronic strain.

[0053] In some embodiments of this application, the thickness of the carbon fiber plate is 0.8~1.5mm, and a bending line or thinning groove is provided in the forefoot bending area of ​​the carbon fiber plate.

[0054] The thickness of the carbon fiber plate, ranging from 0.8 to 1.5 mm, refers to the physical thickness range of the carbon fiber composite plate that constitutes the rigid support layer. This thickness range ensures sufficient structural strength while also taking into account lightweight and formability, making it suitable for the space constraints and mechanical requirements of high-heeled shoe midsoles.

[0055] The forefoot flexion zone refers to the area on the midsole corresponding to the metatarsophalangeal joint of the foot, that is, the area where the foot naturally flexes during the push-off phase of walking, usually located between the middle of the forefoot and the base of the toes.

[0056] A bend line is a pre-defined weak line formed on a carbon fiber sheet by laser cutting, indentation, or local etching, making it easier to bend in a specific direction at that location.

[0057] Thinning grooves refer to the process of reducing the material thickness in a local area of ​​a carbon fiber sheet through mechanical processing or mold forming to create a groove or thinner area, thereby reducing the bending stiffness of that part and facilitating bending deformation.

[0058] Carbon fiber material itself is characterized by high rigidity and difficulty in bending. If the entire carbon plate is of uniform thickness and has no structural design, it will severely hinder the natural flexion of the foot during walking (especially the push-off action of the metatarsophalangeal joint), resulting in a "walking on steel plate" feeling, stiff gait, and even fatigue. By setting flex lines or thinning grooves in the forefoot flexion area, the flexural modulus of this local area is significantly reduced, allowing the carbon plate to fold naturally with the foot movement in the areas where flexion is required. This achieves an ideal synergy of "overall rigid support + local flexible flexion," improving the naturalness of wearing and the smoothness of gait.

[0059] The forefoot area is a key part for generating power during the walking propulsion phase. The presence of zigzag lines or thinning grooves allows the carbon fiber plate to bend orderly along a preset path and store elastic potential energy when pushing off the ground. This energy is released at the moment of lift-off, generating a certain "lever propulsion" effect, assisting the toes in pushing off the ground, improving walking efficiency and energy saving, and allowing high-heeled shoe wearers to obtain a "propulsion" similar to that of sports shoes.

[0060] Thickness range of 0.8~1.5mm has been precisely optimized: If the thickness is less than 0.8mm, the carbon plate may not be strong enough and may break or deform under long-term stress. If the thickness is greater than 1.5 mm, the weight will increase, and excessive rigidity will seriously affect the bending performance.

[0061] This thickness range ensures that the carbon plate provides arch support and torsional stability while maintaining its lightweight characteristics (the weight of a single midsole carbon plate can be controlled between 30 and 60g), thus avoiding increasing the overall burden on high heels.

[0062] A second aspect of this application provides a high-heeled shoe, comprising: The upper, outsole, and carbon fiber plate midsole of the high-heeled shoe in any of the embodiments of the first aspect described above; In particular, the flexible cushioning layer of the carbon fiber plate midsole in high heels is in direct contact with the insole or shoe cavity.

[0063] Upper: Wraps around the foot, providing a stylish look, breathability, and support. Outsole: Located at the bottom, in direct contact with the ground, it provides functions such as wear resistance, slip resistance, and grip. Carbon fiber plate midsole for high heels: Located between the upper and outsole, it serves as the core functional layer, integrating both rigid support and flexible cushioning.

[0064] The three elements work together to significantly enhance the functionality of high heels while maintaining their aesthetic design.

[0065] The carbon fiber plate midsole is positioned between the upper and the outsole, serving as a crucial structural layer connecting the "upper support" and "lower support." Its upper layer is a flexible cushioning layer (EVA foam), and the lower layer is a rigid support layer (carbon fiber plate). This layout ensures that the foot first contacts the soft, highly elastic EVA material, providing excellent tactile feedback and initial cushioning. Meanwhile, the ground reaction force is effectively dispersed and resisted by the carbon fiber plate, preventing midsole collapse or twisting.

[0066] Specifically, the upper surface of the flexible cushioning layer is in direct contact with the insole or shoe cavity, meaning that: If an insole is included, the EVA layer provides a stable and highly elastic basic support platform. If there is no separate insole, the EVA layer directly serves as the insole of the shoe cavity and contacts the sole of the foot.

[0067] This design ensures that the excellent cushioning and rebound properties of supercritical foamed EVA can be directly applied to the sole of the foot, maximizing its advantages of being lightweight, highly elastic, and having pressure dispersion, improving fit and comfort, and avoiding performance degradation caused by intermediate structural barriers.

[0068] The second aspect of this application successfully applies the "carbon plate + supercritical EVA" composite midsole from the first aspect of the embodiment to the overall shoe structure, marking the transformation of this innovative technology from the component level to the product level. Through system integration, the high heels achieve cushioning, stability, and energy return capabilities close to those of athletic shoes without altering their appearance, breaking through the technical bottleneck of traditional high heels being "beautiful but difficult to wear."

[0069] In some embodiments of this application, the heel height of the high heels is 60~120mm, and the thickness of the carbon fiber plate midsole of the high heels gradually increases from the forefoot to the heel.

[0070] A heel height of 60-120mm refers to the vertical height of the heel from the ground to the bottom of the heel, falling into the range of medium-high to very high heels. This range is a common design in women's formal shoes, evening shoes, and fashion shoes, which significantly enhances the beauty of the leg lines, but also leads to a greater tendency for the foot to lean forward and increased pressure on the forefoot.

[0071] The gradual increase in midsole thickness from the forefoot to the heel refers to the gradient distribution of the midsole (including the carbon plate and EVA layer) in high-heeled shoes, which is thinner in the forefoot area and thicker in the heel area, forming a sloping profile that matches the heel height. This design is a fundamental structural feature for achieving the high-heeled look.

[0072] With heels ranging from 60 to 120 mm, the body's center of gravity shifts significantly forward, leading to a sharp increase in forefoot pressure and greater tensile stress on the arch, which can easily cause fatigue, pain, or even injury. This solution utilizes a rigid carbon fiber support layer within this heel height range to effectively resist the tendency of midsole bending and arch collapse caused by forward tilting of the center of gravity, enhancing the overall structural rigidity of the shoe and improving wearing stability and safety.

[0073] The midsole thickness gradually increases from the forefoot to the heel, forming a smooth, sloping transition surface. This makes the contact angle between the sole and the midsole more consistent with the physiological posture when wearing high heels. This design not only ensures the achievement of the high-heel shape but also avoids localized high-pressure points on the sole caused by abrupt changes in slope, helping to distribute longitudinal pressure on the foot and improve overall stress uniformity.

[0074] like Figure 1As shown, a third aspect of this application provides a method for preparing a carbon fiber plate midsole for high-heeled shoes, used to manufacture the carbon fiber plate midsole for high-heeled shoes in any of the embodiments of the first aspect, comprising: Step 100: Based on the foot-type database model, determine the upper mold for pressing the flexible buffer layer and the lower mold for pressing the rigid support layer.

[0075] Step 200: The carbon fiber prepreg is laid in the lower mold and hot-pressed to obtain a carbon fiber board.

[0076] Step 300: Inject supercritical foamed EVA particles into the upper mold and integrally mold them with the pre-formed carbon fiber plate in the composite mold to combine the foamed EVA with the carbon fiber plate.

[0077] Step 100 is the design and preparation phase for the entire manufacturing process.

[0078] A "foot type database" refers to a digital database established by enterprises or research institutions through the collection of a large amount of data on women's foot types (such as foot length, foot width, arch height, and plantar pressure distribution), with a particular focus on the foot morphological characteristics of people who wear high heels.

[0079] Using this database for 3D modeling and simulation analysis, the ideal curved surface shape of the midsole can be accurately determined, especially the ergonomic curved surface of the flexible cushioning layer (such as the medial arch support, forefoot curvature, and heel cup shape).

[0080] Based on this 3D model, the following were designed and manufactured: Upper mold: used to form a foamed EVA flexible cushioning layer, its cavity surface precisely matches the shape of the foot sole; Lower mold: used for hot pressing carbon fiber prepreg to form carbon fiber sheets with specific curvature and structure (such as heel upturn and forefoot bending guide lines).

[0081] The design achieves a combination of personalization and group adaptability, improving the fit and comfort of the midsole; High mold precision ensures consistency in every pair of midsoles during mass production; Providing a structural foundation for subsequent composite molding is a prerequisite for achieving "rigid-flexible synergy".

[0082] In step 200, this step is an independent forming process for the rigid support layer.

[0083] "Carbon fiber prepreg" refers to a semi-finished material made by impregnating carbon fiber fabric in resin (such as epoxy resin) in advance, which has good lay-upability and curing reactivity.

[0084] The prepreg is laid manually or automatically in the lower mold according to the design direction (such as 0° / 90° or ±45° layup) to ensure that the fiber orientation matches the direction of force, so as to maximize bending and torsional resistance.

[0085] After the mold is closed, it is sent into a hot press and cured at a set temperature (usually 120~180℃), pressure (0.5~2MPa), and time (10~30 minutes) to cross-link the resin and finally obtain a carbon fiber plate with high strength and high rigidity.

[0086] Hot pressing can precisely replicate the mold surface, ensuring that the carbon fiber plate has complex structures such as heel lift and forefoot thinning groove; Layered design can optimize mechanical properties and improve fatigue resistance and durability; It forms an independent rigid framework, providing a stable matrix for subsequent composites.

[0087] In step 300, this step is the core composite process, which realizes the integration of the flexible layer and the rigid layer.

[0088] "Supercritical foamed EVA particles" refer to EVA beads pre-made using supercritical fluid (such as CO2 or N2) foaming technology, which have the characteristics of fine pores, low density, and good resilience.

[0089] These particles are injected into the upper mold, while the carbon fiber plate formed in step 200 is precisely placed below the particles or embedded in a specific position in the mold.

[0090] The entire assembly is placed in a composite mold and heated by steam or hot air, causing the EVA particles to expand and fuse into a whole. At the same time, under high temperature and high pressure, it forms a physical anchor and interface bond with the carbon fiber plate surface, achieving "integrated molding".

[0091] Note: Hot melt adhesive or primer can be pre-coated on the upper surface of the carbon fiber sheet to enhance the bonding force between EVA and the carbon sheet and prevent delamination.

[0092] One-piece molding ensures a strong bond between the two layers of materials, preventing delamination and slippage during later use; EVA fills the micropores on the surface of the carbon plate during the foaming process, forming a mechanical interlock and improving the interface strength; The final shape of the midsole (such as gradient thickness, arch support bulge, etc.) can be completed simultaneously, with a high degree of process integration; It ensures product consistency and production efficiency, making it suitable for large-scale manufacturing.

[0093] In some embodiments of this application, the method further includes: After demolding, the edges are trimmed to obtain a carbon fiber plate midsole for high heels with a layered composite structure.

[0094] Demolding: This refers to the process of removing the molded midsole from the composite mold after the "integrated molding" in step 300 is completed. At this time, the midsole has a complete three-dimensional shape and layered structure (the upper layer is foamed EVA, and the lower layer is carbon fiber plate), but there may be overflowing burrs, flash, or irregular residues at the edges.

[0095] Trimming: This refers to the trimming of the midsole after demolding, removing excess material (commonly known as "burrs" or "excess glue") generated during the molding process, so that the edge contour of the midsole is clear, smooth, and meets the design dimensions and assembly requirements.

[0096] Layered composite structure: This refers to the final midsole being made of two layers of functional materials firmly bonded together – the upper layer is a flexible cushioning layer (supercritical foamed EVA), and the lower layer is a rigid support layer (carbon fiber plate). The two work together to achieve the performance goal of "combining rigidity and flexibility".

[0097] Trimming eliminates appearance defects such as burrs and flash generated during the molding process, ensuring that the edges of each pair of midsoles are neat and clean, meeting the requirements of high heels as a fashion consumer product for an exquisite appearance, and enhancing the product's grade and brand quality.

[0098] The midsole of high-heeled shoes needs to fit precisely with the upper, outsole, and insole. Excess material at the edges can lead to assembly difficulties, misalignment, or stress concentration. Trimming ensures that the length, width, and outline of the midsole strictly conform to the design drawings, improving overall shoe assembly efficiency and yield.

[0099] In some embodiments of this application, the integral molding temperature is 120~160℃, the pressure is 5~10MPa, and the time is 3~8 minutes.

[0100] Integrated molding refers to the process of placing pre-formed carbon fiber sheets and supercritical foamed EVA particles into a composite mold, where the EVA foaming, fusing, and interface bonding with the carbon sheet are completed simultaneously under heat and pressure to form an integral structure.

[0101] The temperature range is 120~160℃, which is the ambient temperature range of the material during mold heating or steam heating. This temperature must be sufficient to activate the foaming and melt bonding of EVA particles without damaging the resin matrix of the carbon fiber sheet.

[0102] The pressure of 5~10 MPa refers to the pressure per unit area applied to the mold during the molding process. This pressure is used to compact the material, promote the flow and filling of EVA, enhance interlayer contact, and prevent the formation of bubbles or delamination during foaming.

[0103] Time 3~8 minutes: This refers to the duration of maintaining a constant temperature and pressure to ensure that EVA fully foams, fuses, and completes interfacial bonding with the carbon fiber plate. Under conditions of 120~160℃ + 5~10MPa, EVA is in a state of high fluidity and high activity, and can quickly fill the grooves and textures on the surface of the carbon fiber plate in a short time (3~8 minutes) to form a "micro-mechanical interlocking" structure; High pressure suppresses the expansion of bubbles that may occur at high temperatures, ensuring a uniform and dense foam structure; Short-time and high-efficiency molding, suitable for automated continuous production, reducing unit energy consumption and manufacturing costs.

[0104] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0105] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0106] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A carbon fiber plate midsole for high-heeled shoes, characterized in that, include: A flexible buffer layer and a rigid support layer are stacked from top to bottom; The rigid support layer includes a carbon fiber plate that extends along the length of the shoe and covers the area from the forefoot to the heel. The flexible buffer layer includes foamed EVA, which is disposed on the carbon fiber plate.

2. The carbon fiber plate midsole for high-heeled shoes according to claim 1, characterized in that, The flexible cushioning layer has an upwardly raised support section on the inner arch area to provide dynamic support for the inner arch.

3. The carbon fiber plate midsole for high-heeled shoes according to claim 1, characterized in that, The heel area of ​​the carbon fiber plate curves upward to form an arc-shaped structure that fits the back of a high-heeled shoe.

4. The carbon fiber plate midsole for high-heeled shoes according to claim 1, characterized in that, The foamed EVA is supercritical foamed EVA, and the density of the supercritical foamed EVA is 0.15~0.25g / cm³, with a resilience of ≥65%.

5. The carbon fiber plate midsole for high-heeled shoes according to claim 1, characterized in that, The carbon fiber plate has a thickness of 0.8~1.5mm, and a bending line or thinning groove is provided in the forefoot bending area of ​​the carbon fiber plate.

6. A type of high heel, characterized in that, include: Upper, outsole, and carbon fiber plate midsole for high heels as described in any one of claims 1 to 5; The flexible cushioning layer of the carbon fiber plate midsole in the high-heeled shoe is in direct contact with the insole or shoe cavity.

7. The high heels according to claim 6, characterized in that, The heel height of the high heels is 60~120mm, and the thickness of the carbon fiber plate midsole of the high heels gradually increases from the forefoot to the heel.

8. A method for preparing a carbon fiber plate midsole for high-heeled shoes, used to manufacture a carbon fiber plate midsole for high-heeled shoes as described in any one of claims 1 to 5, characterized in that, include: Based on foot-type database modeling, the upper mold for pressing the flexible buffer layer and the lower mold for pressing the rigid support layer were determined. Carbon fiber prepreg is laid in the lower mold and hot-pressed to obtain the carbon fiber board; Supercritical foamed EVA particles are injected into the upper mold and integrally molded with the pre-formed carbon fiber plate in the composite mold, so that the foamed EVA and the carbon fiber plate are combined.

9. The method for preparing a carbon fiber plate midsole for high-heeled shoes according to claim 8, characterized in that, The method also includes: After demolding, the edges are trimmed to obtain a carbon fiber plate midsole for high heels with a layered composite structure.

10. The method for preparing a carbon fiber plate midsole for high-heeled shoes according to claim 8, characterized in that, The integral molding temperature is 120~160℃, the pressure is 5~10MPa, and the time is 3~8 minutes.

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