Ventilative and draining EVA slippers

Abstract

This utility model provides a breathable and drainable EVA slipper, including a sole, insole, upper, and multiple drainage holes. The sole provides basic support and drainage channels. The insole is disposed on the upper surface of the sole, directly contacting the foot and providing breathability and drainage. The upper is fixedly connected to the front and sides of the sole, wrapping and securing the foot. Drainage holes are disposed through the sole and communicate with the insole to drain sweat out of the shoe. The insole includes multiple radial grooves, annular grooves, and raised particles. The technical solution provided by this utility model can improve the shape of the insole texture to guide foot sweat to drain quickly without accumulation.

Description

Technical Field

[0001] This application relates to footwear manufacturing, specifically to a breathable and drainage-permeable EVA slipper. Background Technology

[0002] A breathable and drainage EVA slipper is made of lightweight EVA material. Its design focuses on achieving good breathability and drainage through internal structure to reduce foot sweat buildup and improve wearing comfort. However, the product has a technical problem: how to improve the shape of the insole pattern to more effectively guide foot sweat to drain away quickly and avoid sweat lingering and accumulating on the insole surface. Utility Model Content

[0003] In view of this, the present disclosure provides a breathable and draining EVA slipper, which at least partially solves the problems existing in the prior art.

[0004] A breathable and drainable EVA slipper includes a sole, an insole, an upper, and multiple drainage holes. The sole is made of EVA material and provides basic support and drainage channels. The insole is disposed on the upper surface of the sole and is used to directly contact the foot and provide breathability and drainage. The upper is fixedly connected to the front and sides of the sole and is used to wrap and fix the foot. The drainage holes are disposed through the sole and communicate with the insole to drain sweat out of the shoe.

[0005] The insole includes multiple radial grooves, multiple annular grooves, and multiple raised particles. The radial grooves extend from the center of the insole towards the edge, guiding sweat to flow quickly from the sole to the side. The annular grooves are located in the heel area of ​​the insole and intersect with the radial grooves, collecting sweat and guiding it to drainage holes. The raised particles are distributed on the upper surface of the insole and located between the radial and annular grooves, increasing surface friction and dispersing sweat to prevent accumulation.

[0006] Preferably, the radial grooves have a V-shaped cross-section to promote rapid sweat flow without accumulation.

[0007] Preferably, the depth of the radial groove gradually decreases from the center of the sole towards the edge to accelerate sweat expulsion.

[0008] Preferably, the radial groove includes multiple branch grooves that extend from the main radial groove to increase the sweat guiding path.

[0009] Preferably, the cross-sectional shape of the annular groove is U-shaped to effectively collect sweat and prevent it from accumulating.

[0010] Preferably, the width of the annular groove is greater than the width of the radial groove to accommodate more sweat and guide it to the drainage hole.

[0011] Preferably, the annular groove and the radial groove have a smooth transition zone at their intersection to prevent sweat accumulation.

[0012] Preferably, the raised particles are hemispherical with a flat top, used to disperse sweat and increase friction.

[0013] Preferably, the upper surface of the insole is further provided with a guide ridge, which is located between the radial grooves to further guide sweat to flow into the grooves.

[0014] This disclosure provides a breathable and drainage-permeable EVA slipper. This technical solution can improve the shape of the insole texture to guide sweat from the feet to drain quickly without accumulating. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the exemplary embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a top view schematic diagram of the structure of this utility model; In the diagram: 1. Outsole; 2. Insole; 3. Upper; 4. Drainage hole; 5. Radial groove; 6. Circular groove; 7. Raised particles; 8. Branching groove; 9. Smooth transition zone; 10. Guide ridge. Detailed Implementation

[0017] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0018] As shown in the figure, a breathable and drainable EVA slipper according to this application includes a sole 1, an insole 2, an upper 3, and multiple drainage holes 4. The sole 1, as the basic structure of the slipper, is located at the bottom of the slipper and is made of EVA material. It provides overall support and forms drainage channels. The sole 1 is achieved through an injection molding process of EVA material, for example, by injecting ethylene-vinyl acetate copolymer into a mold and foaming it to form a lightweight and elastic base, thereby ensuring that it has good cushioning performance and drainage capacity. The insole 2 is located on the upper surface of the sole 1, directly contacting the user's foot, and provides breathability and drainage. The insole 2 includes multiple radial grooves 5, multiple annular grooves 6, and multiple raised particles 7. The radial grooves 5 extend from the center of the insole 2 towards the edge, the annular grooves 6 are located in the heel area of ​​the insole 2 and intersect with the radial grooves 5, and the raised particles 7 are distributed on the upper surface of the insole 2 between the grooves. The insole 2 is manufactured using a molding process with silicone or breathable EVA composite materials. For example, during the molding process, a mold with grooved and particle patterns is used to imprint the surface, creating a specific texture that optimizes the flow path and distribution of sweat. The upper 3 is fixedly connected to the front and sides of the sole 1 to wrap and secure the foot. The upper 3 is connected to the sole 1 by adhesive or hot-press welding. For example, breathable mesh material is cut and bonded to the edge of the sole 1, then cured with high-temperature hot melt adhesive to ensure a stable connection and maintain the overall breathability of the structure. Multiple drainage holes 4 are provided through the sole 1 and connected to the insole 2 to drain sweat out of the shoe. The drainage holes 4 are formed by drilling or molding during the manufacturing process of the sole 1, for example, by using circular holes with a diameter of about 2-3 mm evenly distributed to ensure alignment with the groove system of the insole 2, thereby establishing a continuous drainage channel.

[0019] This application addresses the technical problem of how to improve the tread shape of the insole 2 to guide foot sweat quickly out without accumulation. Specifically, multiple radial grooves 5 of the insole 2 extend from the center of the sole to the edge, forming a radial flow path that guides sweat from the high-sweat area of ​​the sole to the sides. Multiple annular grooves 6 are located in the heel area and intersect with the radial grooves 5, forming a convergence point that directs sweat to the drainage holes 4 of the sole 1. Multiple raised particles 7 are distributed between the grooves to increase surface friction and disperse sweat droplets, preventing local accumulation. This combined design, by optimizing the tread geometry (e.g., the depth and width of the grooves are approximately 0.5-1 mm), technically achieves multi-level guidance and dispersion of sweat, avoiding sweat retention and thus improving drainage efficiency and comfort.

[0020] Radial grooves 5 are provided on the upper surface of the insole 2, extending radially from the center of the foot towards the edge of the insole 2. These grooves have a V-shaped cross-section, characterized by two inclined sidewalls extending downwards from the surface of the insole 2 and converging at the bottom to form an acute apex. This V-shaped geometry optimizes the depth-to-width ratio of the grooves, ensuring the continuity of the liquid flow path. Specifically, the inclination angle of the groove sidewalls is designed within a specific range to match the surface tension characteristics of sweat, thereby minimizing flow resistance.

[0021] The radial grooves 5 are positioned in coordination with the overall drainage system of the insole 2, ensuring that sweat flows smoothly from the sole area to the sides. The V-shaped cross-section of the grooves must be designed with material elasticity in mind during manufacturing to prevent deformation due to foot pressure, which could affect flow efficiency. Furthermore, the grooves extend in a direction aligned with the physiological structure of the foot to maximize coverage of sweat-prone areas.

[0022] In one embodiment, the radial groove 5 of a breathable and drainage EVA slipper of this application is realized by injection molding process, wherein the upper mold part of the mold is provided with a V-shaped protrusion structure. After the EVA material is injected and cooled and solidified, a precise V-shaped cross-section groove is formed on the surface of the insole 2. Specifically, the tilt angle and depth parameters of the protrusion structure are calculated and optimized to match the radial extension path of the groove.

[0023] Radial grooves 5 are provided on the upper surface of the insole 2, extending radially from the center of the foot to the edge area, with a non-uniform depth distribution. Specifically, the depth of the grooves is greatest in the center of the foot and continuously decreases radially towards the edge, forming a gradient structure. This depth-decreasing design optimizes the sweat flow path by changing the cross-sectional profile of the grooves, ensuring that the liquid is quickly guided to the edge of the insole 2 under the action of gravity.

[0024] The depth variation of the radial grooves 5 is coordinated with the overall layout of the insole 2, with the grooves starting at a high point in the center of the foot and ending at a low point at the edge, maintaining communication with the annular grooves 6 at their intersection in the heel area. This structure prevents sweat from accumulating in the central area while promoting a smooth transition of sweat to the side drainage holes 4. The groove depth gradient can be achieved through precise dimensional control, for example, a depth of approximately 2-3 mm in the central area and reduced to 0.5-1 mm in the edge area, to match the pressure distribution of the foot.

[0025] In one embodiment, the radial groove depth decreasing feature of the breathable and drainage EVA slipper of this application is achieved through a mold forming process. Specifically, when manufacturing the insole 2, the groove portion of the mold is designed as a cavity with continuously varying depth. For example, the groove cross-section radiating outward from the center point of the foot has a tapered decreasing shape, ensuring that the groove forms a preset depth gradient after injection molding of the EVA material. The cavity contour of the mold is optimized based on a foot anatomy model. For example, the central area adopts a deeper concave structure, and the edge area gradually becomes a shallow groove, so that the depth decreasing characteristic is directly reflected after the insole 2 is cured.

[0026] This feature involves improvements to the radial grooves 5, which include multiple branch grooves 8 extending from the main radial grooves 5 to expand the network of sweat-guiding pathways. The branch grooves 8 optimize sweat flow efficiency and reduce the risk of sweat buildup in the central area of ​​the foot by increasing groove density and length. Specifically, the branch grooves 8 are structurally designed as elongated grooves that connect to the main radial grooves 5, forming a radial or tree-like drainage system.

[0027] In terms of structure, the branch grooves 8 can be arranged on the sidewalls or ends of the main radial grooves 5, branching out at different angles, such as extending vertically or obliquely. They cover specific areas of the insole surface 2, such as the toes or arch area, ensuring that the sweat guiding path covers a wider area of ​​the foot. In terms of connection, the branch grooves 8 are directly integrated with the main radial grooves 5 to form a continuous channel, avoiding interruptions and thus improving overall drainage performance.

[0028] In one embodiment, the radial groove 5 of a breathable and drainage EVA slipper of this application includes multiple branch grooves 8. For example, the branch grooves 8 are arranged on both sides of the main radial groove 5, extending outward in a radial manner to cover the outer part of the central area of ​​the foot. Specifically, these branch grooves 8 are smaller in width, have the same depth as the main groove, and branch off from the main groove at an angle of approximately 30 degrees, thereby creating additional sweat flow channels.

[0029] The annular groove 6 is located in the heel area of ​​the insole 2, intersecting with the radial groove 5 to form a sweat-guiding network. Specifically, the groove has a U-shaped cross-section, with its recessed structure including a flat bottom and two upward-extending sidewalls. This geometry provides a continuous curved surface, facilitating sweat flow along the sidewalls to the bottom and preventing localized stagnation. In the installed position, the annular groove 6 surrounds the center of the heel and forms a seamless transition with the radial groove 5 at the intersection, ensuring that sweat smoothly collects from the ball of the foot area to the heel.

[0030] This U-shaped cross-section achieves efficient drainage by optimizing the depth and width ratio of the grooves. The bottom width of the groove is slightly greater than the sidewall height to accommodate sweat volume and reduce resistance. Simultaneously, the inclination angle of the sidewalls is controlled between 30 and 45 degrees, promoting the directional movement of liquid towards the drainage holes. This structure avoids sharp edges, reducing the risk of sweat buildup.

[0031] In one embodiment, the annular groove 6 of a breathable and drainage EVA slipper of this application is integrally formed during the manufacturing process of the insole 2 using an injection mold. Specifically, the cavity of the mold is designed with a U-shaped profile, forming a groove structure after the EVA material cools and solidifies; for example, the groove depth is 2 mm to 4 mm and the width is 3 mm to 5 mm to ensure a smooth connection at the intersection with the radial groove 5, thereby effectively collecting sweat.

[0032] This feature relates to an optimized insole structure 2 of a breathable and drainage-resistant EVA slipper, specifically, the width of the annular groove 6 is designed to be greater than the width of the radial groove 5. This dimensional difference aims to enhance sweat management capabilities by increasing the cross-sectional area of ​​the annular groove 6 to enhance its water storage capacity, thereby more effectively collecting and guiding sweat flow. Since the annular groove 6 is mainly located in the heel area of ​​the insole 2, where sweat secretion is relatively concentrated, while the radial groove 5 radiates outward from the center of the foot, the two intersect at specific locations to form a connected network. The increased width of the annular groove 6 can receive and temporarily accommodate sweat flowing in from the radial groove 5, preventing local overflow or accumulation, and further guiding the sweat to the drainage holes 4 for rapid drainage.

[0033] In terms of technical implementation, this width difference takes into account ergonomic and hydrodynamic principles. The wider design of the annular groove 6 allows it to serve as the main collection channel, while the narrower width of the radial groove 5 focuses on guiding sweat from the center of the foot to the edges. The intersection of the two ensures that sweat smoothly transitions from the radial groove 5 to the annular groove 6 and is finally discharged through the drain hole 4, thereby optimizing overall drainage efficiency and avoiding sweat retention problems caused by insufficient groove size.

[0034] In one embodiment, the width of the annular groove 6 of the breathable and drainage EVA slipper of this application being greater than the width of the radial groove 5 can be achieved through the molding process of the insole 2. Specifically, an annular groove 6 is provided on the upper surface of the insole 2 in the heel area, and its width is greater than the radial groove 5 extending from the center area of ​​the foot. The annular groove 6 and the radial groove 5 are directly connected at the intersection. For example, a continuous groove structure is formed by mold pressing or injection molding process to ensure that sweat can be efficiently guided to the drainage hole 4 after flowing from the radial groove 5 into the annular groove 6.

[0035] In the insole 2 structure, the area where the radial grooves 5 and the annular grooves 6 intersect is designed to include a smooth transition zone 9. This zone, located at the intersection of the grooves, ensures the continuity of sweat flow. Specifically, the smooth transition zone 9 seamlessly connects the extension path of the radial grooves 5 and the converging path of the annular grooves 6 through a continuous curved or arc-shaped connection, avoiding sharp corners or dead angles. This structure is arranged in the heel area of ​​the insole 2, where the annular grooves 6 are mainly distributed and form a cross network with the radial grooves 5, thereby optimizing sweat guidance efficiency.

[0036] The smooth transition zone 9 comprises a smooth transition surface with an optimized radius of curvature to match the depth and width of the grooves. In its installation position, this transition zone is directly integrated into the groove system of the insole 2, serving as an inherent part of the groove connection point, ensuring that sweat flows naturally from the radial grooves 5 into the annular grooves 6 without stagnation at the intersection. The connection method involves a smooth transition at the groove edges, avoiding any steps or interruptions to maintain the overall hydrodynamic performance of the drainage channel.

[0037] In one embodiment, the smooth transition area 9 of a breathable and drainage EVA slipper of this application is achieved by injection molding process. Specifically, a corresponding arc contour is designed in the EVA insole 2 mold so that the radial groove 5 and the annular groove 6 form a continuous curved surface at the intersection. For example, an arc transition with a radius of 1-3 mm is used to eliminate potential accumulation points and improve sweat flow efficiency.

[0038] Raised particles 7 are distributed on the upper surface of the insole 2, specifically in the area between the radial grooves 5 and the annular grooves 6, to optimize sweat management and friction performance. These particles are designed with a hemispherical structure, with a flat top surface rather than sharp or completely rounded, thus providing a larger contact area. This shape helps sweat to be evenly distributed, avoiding localized build-up, while the flat top enhances stable contact with the foot, improving slip resistance. Structurally, the hemispherical protrusions extend upwards from the base of the insole 2, forming regularly arranged raised units with their flat tops parallel to the surface of the insole 2, ensuring comfort and functionality.

[0039] Specifically, the flat top of the hemispherical raised particles 7 is achieved through precise geometric design, such as controlling the ratio of the top diameter to the hemispherical height within a specific range to balance drainage efficiency and the coefficient of friction. The particle distribution density can be adjusted to adapt to the pressure requirements of different areas of the foot, preventing sweat retention. The structure is manufactured with consideration for material elasticity and surface texture to ensure reliable physical support points are formed on the EVA insole 2.

[0040] In one embodiment, the raised particles 7 of a breathable and drainage EVA slipper of this application can be achieved by mold stamping technology. For example, during the injection molding process of EVA material in the insole 2, a mold with a hemispherical groove is used, the top of the groove is designed to be flat, and the material is pressed into the groove by high temperature and high pressure, thereby directly forming hemispherical raised particles 7 with flat tops on the surface of the insole 2.

[0041] The raised particles 7 are disposed on the upper surface of the insole 2, specifically in the area between the radial groove 5 and the annular groove 6. The installation position of the raised particles 7 is strictly limited to the gap between the radial groove 5 and the annular groove 6, without directly contacting the groove edges. The structure of the raised particles 7 consists of multiple independent micro-raised units, each with approximately the same size and shape (such as hemispherical or cylindrical), and is integrally molded from the material of the insole 2. In terms of connection, the raised particles 7 are directly fixed to the upper surface substrate of the insole 2 without additional mechanical connecting parts, forming a cooperative drainage channel network with the radial groove 5 and the annular groove 6 solely through their position.

[0042] In one embodiment, the raised particles 7 of a breathable and drainage EVA slipper of this application are uniformly distributed in a grid pattern through the design of the insole 2 mold. Specifically, the upper mold part of the mold is provided with a corresponding grid-shaped groove array, such as rectangular or hexagonal pits. During the injection molding process, the EVA material fills the grooves to form raised particles 7, ensuring that the raised particles 7 are arranged at equal intervals between the radial groove 5 and the annular groove 6 and cover the entire gap area.

[0043] In one embodiment, a guide ridge 10 is added to the upper surface of the insole 2 of a breathable and drainage EVA slipper of this application. The guide ridge 10 is arranged between the radial grooves 5 to enhance the sweat drainage efficiency. Specifically, the guide ridge 10 is installed in the area from the center of the sole to the edge of the insole 2, and its position is parallel or staggered with the radial grooves 5, thereby forming an auxiliary channel in the sweat flow path. The structure of the guide ridge 10 is a continuous or segmented raised line, the height of which is lower than the depth of the radial grooves 5, and it is integrally formed with the surface of the insole 2, ensuring that sweat can be directly guided from the foot contact point to the radial grooves 5, avoiding accumulation in the area between the grooves.

[0044] The guiding ridge 10 comprises a linear or arcuate profile, the ends of which may intersect or be adjacent to the annular groove 6 to facilitate the flow of sweat into the drainage system. This ridge-like structure is distributed among the raised particles 7, without interfering with the dispersion of the particles, but rather serving as a supplementary drainage element to optimize the flow path of sweat from the sole of the foot to the sides.

[0045] In one embodiment, the drainage ridge 10 is formed simultaneously with the insole 2 by a mold injection process, for example, by integral manufacturing using EVA material. The height of the drainage ridge 10 is set to 0.5-1.5 mm, the width is 1-3 mm, and it is slightly inclined along the radial groove 5. Specifically, the inclination angle is 5-15 degrees to guide sweat to flow naturally into the groove.

[0046] In actual operation, when this device is used, when the foot contacts the surface of the insole 2, the sweat is first dispersed by the raised particles 7 distributed on the insole 2 to prevent sweat from accumulating on the foot and increasing friction; then, the sweat flows into the radial grooves 5 of the insole 2, which extend from the center of the foot to the edge, guiding the sweat to flow quickly to the side; at the same time, in the heel area, the annular grooves 6 intersect with the radial grooves 5, collect the sweat and guide it to the drainage holes 4 of the sole 1; finally, the sweat is discharged out of the shoe through the drainage holes 4, realizing the breathable and drainage function, while the sole 1 provides basic support, and the upper 3 wraps and fixes the foot to maintain stability.

[0047] The descriptions using terms such as "some embodiments," "examples," "specific examples," or "some examples" 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. Furthermore, the described specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process. Furthermore, the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functionality involved.

[0050] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. This storage medium can be a read-only memory, a disk, or an optical disk, etc.

[0051] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A breathable and drainage EVA slipper, characterized in that, include: The sole (1) is made of EVA material and is used to provide basic support and drainage channels; Insole (2), provided on the upper surface of the sole (1), for direct contact with the foot and providing breathable and drainage functions; The upper (3) is fixedly connected to the front end and both sides of the sole (1) for wrapping and securing the foot; Multiple drainage holes (4) are provided through the sole (1) and communicate with the insole (2) to drain sweat out of the shoe; The insole (2) includes: Multiple radial grooves (5) extend from the center of the sole of the insole (2) to the edge to guide sweat to flow quickly from the sole to the side; Multiple annular grooves (6) are provided in the heel area of ​​the insole (2) and intersect with the radial grooves (5) to collect sweat and guide it to the drainage holes (4). Multiple raised particles (7) are distributed on the upper surface of the insole (2) and located between the radial groove (5) and the annular groove (6) to increase surface friction and disperse sweat to prevent accumulation.

2. The breathable and draining EVA slipper according to claim 1, characterized in that: The radial groove (5) has a V-shaped cross-section to promote the rapid flow of sweat without accumulation.

3. The breathable and draining EVA slipper according to claim 1, characterized in that: The depth of the radial groove (5) gradually decreases from the center of the sole towards the edge to accelerate the expulsion of sweat.

4. The breathable and draining EVA slipper according to claim 1, characterized in that: The radial groove (5) includes multiple branch grooves (8) that extend from the main radial groove to increase the sweat guiding path.

5. The breathable and draining EVA slipper according to claim 1, characterized in that: The cross-sectional shape of the annular groove (6) is U-shaped to effectively collect sweat and prevent it from accumulating.

6. The breathable and draining EVA slipper according to claim 1, characterized in that: The width of the annular groove (6) is greater than the width of the radial groove (5) to accommodate more sweat and guide it to the drain hole (4).

7. The breathable and draining EVA slipper according to claim 1, characterized in that: The annular groove (6) and the radial groove (5) have a smooth transition zone (9) at their intersection to prevent sweat from accumulating.

8. The breathable and draining EVA slipper according to claim 1, characterized in that: The raised particles (7) are hemispherical with flat tops, used to disperse sweat and increase friction.

9. The breathable and draining EVA slipper according to any one of claims 1-8, characterized in that: The upper surface of the insole (2) is also provided with a guide ridge (10), which is located between the radial grooves (5) to further guide sweat to flow into the grooves.

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