A multi-layer composite density foamed sole

Abstract

The utility model discloses a multilayer composite density foamed shoe sole, foamed shoe sole includes the foot pad layer, high resilience layer, transition layer and high density rubber layer from top to bottom are sequentially stacked and set up, and the accommodation cavity that sets up in the arch of foot part area, and the soft porous breathable cover plate that shape with the opening of accommodation cavity is adapted, still includes a connecting piece, to make soft porous breathable cover plate detachably closes the opening of accommodation cavity, multilayer composite density foaming structure can carry out accurate mechanical property optimization to different area of foot, the bottom layer adopts high density material to provide durable support and stability, the middle layer adopts transition density material to realize effective force transmission, and the upper layer and the bottom contact layer adopt low density high resilience material to provide the extreme soft foot feeling, this gradient density design makes the foot more evenly distributed when walking and standing, effectively relieves foot fatigue.

Description

Technical Field

[0001] This utility model relates to the field of shoe sole technology, specifically to a multi-layer composite density foamed shoe sole. Background Technology

[0002] As a crucial component of footwear, the sole's structural design directly impacts comfort, functionality, and lifespan. With consumers increasingly prioritizing foot health and quality of life, sole technology continues to evolve and innovate.

[0003] In existing technologies, improvements to shoe soles mainly focus on materials and structure. To enhance cushioning and comfort, soles made of composite foam materials of different densities have emerged on the market. These soles consist of two layers of foam with different hardness: a harder upper layer for support and a softer lower layer for cushioning. However, these structures are often still relatively simple, offering limited targeted support and pressure distribution for different areas of the foot. Especially during prolonged walking or standing, fatigue in key areas such as the arch of the foot remains noticeable.

[0004] In terms of functionality, common methods to solve problems such as dampness and odor inside shoes include placing activated carbon bags or deodorizing granules under the insole or inside the shoe upper. However, such designs have obvious drawbacks. First, the activated carbon granules or bags are permanently sealed inside the sole and cannot be replaced. Once they are saturated, the dehumidification and deodorization functions will permanently fail, resulting in a short functional lifespan for the product. Second, if replacement is desired, it usually requires destructive disassembly of the sole, which is irreversible and impractical.

[0005] Another common practice is to place activated charcoal packets directly under the insole, but this can easily lead to uneven pressure on the foot, causing a chafing sensation and seriously affecting wearing comfort.

[0006] In response to the problems exposed during the use of current shoe soles, it is necessary to improve and optimize the structure of foam shoe soles. Summary of the Invention

[0007] To address the aforementioned technical issues, this invention provides a multi-layer composite density foamed shoe sole that offers a synergistic improvement in comfort and support, and achieves long-lasting and sustainable active dehumidification.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a multi-layer composite density foamed shoe sole, the foamed shoe sole comprising a foot pad layer, a high resilience layer, a transition layer and a high-density rubber layer stacked sequentially from top to bottom, wherein the high resilience layer, the transition layer and the high-density rubber layer have different densities and hardness; The foamed sole also includes a storage cavity in the arch area and a soft, porous, breathable cover plate whose shape is adapted to the opening of the storage cavity. The upper surface of the soft, porous, breathable cover plate is flush with or slightly lower than the upper surface of the foot padding. It also includes a connector comprising a first connecting portion disposed on the outer edge of the flexible porous breathable cover and a second connecting portion disposed on the high resilience layer and surrounding the opening of the storage cavity. The first connecting portion and the second connecting portion are connected by a reusable adhesive and detachable manner, so that the flexible porous breathable cover can detachably close the opening of the storage cavity.

[0009] As a preferred technical solution for a multi-layer composite density foamed shoe sole of this utility model, the hardness of the upper high-resilience layer is lower than that of the middle transition layer, and the hardness of the middle transition layer is lower than that of the bottom high-density rubber layer.

[0010] As a preferred technical solution for a multi-layer composite density foamed shoe sole of this utility model, the upper high-resilience layer is made of low-density EVA foam material or ETPU foam material; the middle transition layer is made of medium-high density EVA foam material or PHYLON material; and the bottom high-density rubber layer is made of high-density EVA foam material, rubber or rubber foam composite material.

[0011] As a preferred technical solution of the multi-layer composite density foamed shoe sole of this utility model, the connector is a Velcro, and the foot pad layer is also provided with a recessed part to facilitate the accommodation of the Velcro. The first connecting part is the hook side or the rough side of the Velcro, and the second connecting part is the rough side or the hook side that cooperates with the Velcro.

[0012] As a preferred technical solution of the multi-layer composite density foamed shoe sole of this utility model, the first connecting part is circumferentially connected to the edge of the soft porous breathable cover plate, and the second connecting part is annular and circumferentially arranged around the opening edge of the storage cavity.

[0013] As a preferred technical solution of the multi-layer composite density foamed shoe sole of this utility model, it also includes an activated carbon bag for containing adsorbent material, the activated carbon bag is placed in the storage cavity, and its size is smaller than the size of the storage cavity.

[0014] As a preferred technical solution of the multi-layer composite density foamed shoe sole of this utility model, a side wrapping layer is also bonded and fixed at the outer edge of the foot pad layer, high resilience layer, transition layer and high density rubber layer.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the setting of a multi-layer composite density foam structure, can precisely optimize the mechanical properties of different areas of the foot. The bottom layer uses high-density material to provide durable support and stability, the middle layer uses transition density material to achieve effective force transmission, and the top layer and the contact layer with the sole of the foot use low-density high-resilience material to provide an extremely soft feel. This gradient density design makes the pressure distribution of the foot more uniform when walking and standing, effectively relieving foot fatigue and achieving a perfect balance between support and cushioning, fundamentally improving foot comfort from a structural perspective.

[0016] 2. This technical solution incorporates a storage cavity in the arch area of ​​the sole. This design is not merely a simple opening, but rather a refined functional enhancement of this crucial weight-bearing area. On one hand, the recessed structure of this storage cavity provides additional space for the arch, preventing the complete compression of the arch by traditional soles and acting as a form of "structural pressure relief," further alleviating arch tension. On the other hand, this area is located in a non-direct weight-bearing zone of the sole, minimizing the impact of functional modules on overall comfort. By placing an activated carbon bag within the storage cavity in the arch area, this solution introduces an active dehumidification and odor-proofing mechanism to the sole. Activated carbon efficiently absorbs moisture and odor molecules inside the shoe, maintaining a consistently dry and fresh environment. This fundamentally changes the situation where traditional soles passively breathe or fail irreparably, giving the sole the ability to continuously combat humid environments.

[0017] 3. The soft cover covering the storage cavity is fixed by Velcro. Users can easily tear or stick the cover by hand to remove and replace the activated carbon bag without any tools. The operation is simple, fast, and non-destructive. When the activated carbon bag is saturated, users can buy and replace it at any time, which "regenerates" the dehumidification function of the sole. This greatly extends the functional life of the sole and avoids the need to discard the entire shoe due to the failure of functional components, which is in line with the concept of green and environmentally friendly consumption.

[0018] 4. The Velcro has excellent repeated bonding performance, maintaining sufficient bonding strength even after multiple openings and closings, ensuring that the cover will not open accidentally during walking. Its stability is far superior to simple buckles or easily aging magnetic structures. The storage cavity in the arch area and the replaceable activated carbon bag together form a highly efficient "in-shoe micro-circulation dehumidification system". The natural pressure changes of the foot during walking will produce a "pump" effect on the storage cavity, accelerating the exchange of humid air in the shoe cavity through the cover and activated carbon, thereby improving dehumidification efficiency and achieving dynamic and active humidity regulation. Attached Figure Description

[0019] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic cross-sectional view of the arch portion of the shoe sole in this utility model; In the picture: 1. Foot padding layer; 2. High resilience layer; 3. Side wrapping layer; 4. Storage cavity; 5. Soft, porous, and breathable cover; 6. Sinking section; 7. Transition layer; 8. High-density rubber layer; 9. Activated carbon pack; 10. Velcro. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0022] like Figure 1-2 As shown, the present invention discloses a multi-layer composite density foamed shoe sole, which includes a foot pad layer 1, a high resilience layer 2, a transition layer 7 and a high density rubber layer 8 stacked from top to bottom. The high resilience layer 2, the transition layer 7 and the high density rubber layer 8 have different densities and hardness. The foamed sole also includes a storage cavity 4 opened in the arch area, and a soft, porous, breathable cover plate 5 whose shape is adapted to the opening of the storage cavity 4. The upper surface of the soft, porous, breathable cover plate 5 is flush with or slightly lower than the upper surface of the foot padding layer 1. It also includes a connector, which includes a first connecting part disposed on the outer edge of the soft porous breathable cover 5 and a second connecting part disposed on the high resilience layer 2 and surrounding the opening of the storage cavity 4. The first connecting part and the second connecting part are connected by a repeatable bonding and separation method so that the soft porous breathable cover 5 can detachably close the opening of the storage cavity 4.

[0023] Specifically, the hardness of the upper high-resilience layer 2 is lower than that of the middle transition layer 7, and the hardness of the middle transition layer 7 is lower than that of the bottom high-density rubber layer 8. In this embodiment, the gradient design of the hardness decreasing layer by layer from bottom to top together constructs a synergistic dynamic mechanical system.

[0024] The main function of the low-hardness, high-resilience upper layer 2 is to allow for sufficient local deformation when it comes into contact with the sole of the foot, so as to maximize the absorption and cushioning of the instantaneous impact force generated by the ground during walking, and provide rapid deformation recovery, giving the sole of the foot an immediate soft wrapping feeling and energy feedback, effectively reducing foot muscle fatigue.

[0025] The medium-hardness intermediate transition layer 7 acts as a hub for mechanical transmission. It possesses a higher rigidity modulus and structural support than the upper layer, effectively diffusing and smoothly transmitting the impact stress dispersed by the upper layer, thus preventing excessive stress concentration in specific areas of the sole. At the same time, it effectively prevents excessive torsion of the foot during movement, enhancing gait stability and achieving a balanced transition between cushioning and support performance.

[0026] The high-density rubber layer at the bottom, with its high hardness, forms the rigid support platform of the entire sole. Its main function is to provide durable overall structural stability and resistance to deformation, ensuring the stability of the sole's posture during exercise. Its high hardness and high abrasion resistance directly address ground wear, greatly improving the sole's durability and grip performance, and serving as the ultimate guarantee for the entire cushioning system.

[0027] In summary, this gradient hardness distribution from soft to hard is not a simple superposition of functions, but rather allows the impact force to be attenuated and dissipated in a stepwise manner as it penetrates each layer. This achieves a synergy from "instantaneous cushioning" to "force transmission and dispersion," and finally to "ultimate stability and abrasion resistance," thereby fundamentally improving the overall shock absorption efficiency and wearing comfort from a structural perspective. Specifically, the upper high-resilience layer 2 is made of low-density EVA foam or ETPU foam; the middle transition layer 7 is made of medium-high density EVA foam or PHYLON material; and the bottom high-density rubber layer 8 is made of high-density EVA foam, rubber, or rubber foam composite material.

[0028] Specifically, the connector is a Velcro 10, and the foot pad 1 is also provided with a recessed part 6 to facilitate the accommodation of the Velcro 10. The first connecting part is the hook side or the rough side of the Velcro 10, and the second connecting part is the rough side or the hook side that cooperates with the Velcro 10. In this embodiment, this operation is performed when the user feels that the moisture inside the shoe is increasing or when regular maintenance is required.

[0029] The user can use their fingers or fingernails to pry open a corner of the seam between the soft, porous, breathable cover 5 and the sole. Due to the connection characteristics of the Velcro 10, this operation can achieve initial separation without excessive force.

[0030] Specifically, the first connecting part is circumferentially connected to the edge of the soft, porous, breathable cover plate 5, and the second connecting part is annular and circumferentially arranged around the opening edge of the storage cavity 4.

[0031] Specifically, it also includes an activated carbon pack 9 for containing adsorbent materials. The activated carbon pack 9 is placed inside the storage cavity 4 and its size is smaller than that of the storage cavity 4. This ingenious size design ensures the unity of functionality, convenience and system efficiency.

[0032] First, the extra space in the size provides a crucial channel for airflow. The gap between the activated carbon pack 9 and the inner wall of the storage cavity 4 forms a micro-circulation airflow channel surrounding the carbon pack. When the arch of the foot presses against the soft, porous, breathable cover 5 during walking, this gap allows humid air inside the shoe cavity to fully contact and penetrate the activated carbon pack 9 from all directions, rather than just passing through from directly above the pack. This greatly increases the effective contact area between the activated carbon and the air, thereby improving the efficiency and speed of dehumidification and ventilation.

[0033] This design greatly simplifies the replacement process. Since the activated charcoal pack 9 is not tightly fitted or squeezed into the storage cavity 4, users do not need to pry it off forcefully; they can easily remove it with their fingers, avoiding damage to the pack or a decline in user experience due to inconvenient operation. At the same time, the ample space also facilitates the quick and accurate placement of a new activated charcoal pack 9 into the cavity, achieving "blind operation" level convenience.

[0034] The activated carbon pack itself is preferably made of highly breathable non-woven fabric or microporous fiber fabric, and its interior is filled with high-quality columnar or granular activated carbon with a high specific surface area. This breathable structure, combining the inside and outside, ensures that the adsorption medium (activated carbon) is not isolated from air due to overly tight packaging or installation, but can always be in a highly efficient "breathing" working state, continuously and actively adsorbing moisture and odor molecules inside the shoe.

[0035] The size matching relationship between the activated carbon bag 9 and the storage cavity 4 is not a simple matter of containment, but rather the entire dynamic micro-circulation dehumidification system. By reserving airflow channels, ensuring ease of operation, and optimizing the air permeability of the carbon bag itself, it jointly ensures the long-lasting, efficient, and stable dehumidification function, fundamentally solving the drawbacks of traditional built-in adsorption components that are easy to saturate, difficult to replace, and inefficient.

[0036] Specifically, a side wrapping layer 3 is also bonded and fixed to the outer edge of the foot padding layer 1, the high-resilience layer 2, the transition layer 7, and the high-density rubber layer 8. As a key integrated structure, the side wrapping layer 3 is mainly intended to improve the overall integrity, durability, and aesthetic value of the sole.

[0037] At the structural level, the side wrapping layer 3 plays a crucial role in "constraint and reinforcement." It is firmly bonded to the sides of the multi-layered composite density foam structure through a high-strength adhesive, acting like a tight "binding ring" to tightly wrap each layer of foam material into a more rigid whole. This structure effectively limits the lateral expansion and displacement of each foam layer under long-term frequent deformation, greatly reducing the risk of separation and delamination between layers due to shear forces, thereby significantly improving the structural stability and service life of the sole.

[0038] In terms of protection and durability, this design provides additional armor-like protection. The sides of the sole are easily scratched and impacted by hard objects such as steps, pebbles, and curbs during daily wear. The side wrapping layer 3 is preferably made of TPU (thermoplastic polyurethane) or high-density rubber, which has a much higher abrasion resistance than the internal foam material. It can directly withstand these physical abrasions, effectively preventing the soft internal EVA or PHYLON foam materials from being directly scratched, torn, or structurally damaged, thus protecting the integrity of the core functional layers (high-resilience layer, transition layer).

[0039] In terms of manufacturing process and aesthetics, the side wrapping layer 3 achieves a unity of function and form. Through injection molding or high-frequency hot-press bonding, this wrapping layer can be seamlessly integrated with the sole body. It not only conceals the joint lines of the internal multi-layer structure, making the sole look more complete, refined, and upscale, but also provides additional design space for brand logos, decorative lines, or functional textures (such as auxiliary flex grooves), enhancing the overall recognition and perceived value of the product.

[0040] The working principle and usage process of this utility model: The sole of this utility model adopts a four-layer composite density structure, which constitutes a complete mechanical management system; The foot padding layer 1, as the first layer in direct contact with the sole of the foot, mainly provides a skin-friendly and soft touch and responds quickly to subtle foot movements; the high-resilience layer is located below the padding layer, and its low density and high resilience characteristics allow it to deform significantly when the foot hits the ground, efficiently absorbing impact energy and storing some of the energy. The transition layer, with its medium density and hardness, acts as an "intermediary" for force transmission. It transforms the intense, localized deformation of the high-resilience layer into smoother, more widely distributed support, preventing sudden changes in force and further transmitting and dispersing the impact force to the underlying layers. The high-density rubber layer, as the bottom layer in contact with the ground, ensures the overall stability and rigidity of the sole due to its high density and hardness, providing a reliable support platform and giving the sole excellent wear resistance and anti-slip performance.

[0041] When the foot lands, the impact force is transmitted from bottom to top. Through these four functionally distinct layers, the entire process of "absorption-conduction-dispersion-stabilization" is achieved, ultimately transforming the concentrated impact force into a soft and comfortable feel, effectively relieving foot fatigue.

[0042] The storage cavity located in the arch of the foot is the core function of this system. The arch of the foot is not a major weight-bearing area, so setting up a cavity here has the least impact on overall comfort. At the same time, the pressure changes significantly in this area during walking.

[0043] During walking, the arch of the foot periodically applies pressure and releases on the soft cover. When the arch of the foot presses down, the volume of the storage cavity shrinks, and the internal air is squeezed out through the micropores of the cover; when the arch of the foot lifts up, the volume of the cavity recovers, creating negative pressure, which draws in the moist air inside the shoe cavity and into the storage cavity through the micropores of the cover.

[0044] The activated carbon pack placed inside the storage cavity, with its huge specific surface area and abundant microporous structure, can efficiently adsorb moisture and odor molecules (such as ammonia and acetic acid in sweat) pumped into the cavity, thus continuously keeping the shoe's interior environment dry and fresh. The "porous breathable" characteristics of the cover plate are key to achieving this dynamic air exchange.

[0045] The circular Velcro straps provide uniform adhesion in all directions, ensuring that the cover will not shift or loosen during normal walking, running, or jumping, thus guaranteeing safety and stability during use.

[0046] When the activated carbon pack needs to be replaced, users can simply tear off the cover by hand. The operation is simple and straightforward, requiring no tools and causing no physical damage to the sole structure. The reusable adhesive properties of the Velcro allow this opening and closing operation to be performed hundreds or even thousands of times, ensuring functional sustainability.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to further limit the present utility model. All equivalent changes made based on the description and drawings of the present utility model are within the protection scope of the present utility model.

Claims

1. A multi-layer composite density foamed shoe sole, characterized in that: The foamed sole includes a foot pad layer (1), a high resilience layer (2), a transition layer (7) and a high-density rubber layer (8) stacked from top to bottom. The high resilience layer (2), the transition layer (7) and the high-density rubber layer (8) have different densities and hardness. The foamed sole also includes a storage cavity (4) opened in the arch area, and a soft, porous, breathable cover plate (5) whose shape is adapted to the opening of the storage cavity (4). The upper surface of the soft, porous, breathable cover plate (5) is flush with or slightly lower than the upper surface of the foot pad (1). It also includes a connector, which includes a first connecting part disposed on the outer edge of the soft porous breathable cover (5) and a second connecting part disposed on the high resilience layer (2) and surrounding the opening of the storage cavity (4). The first connecting part and the second connecting part are connected by a repeatable bonding and separation method so that the soft porous breathable cover (5) can detachably close the opening of the storage cavity (4).

2. The multi-layer composite density foamed shoe sole according to claim 1, characterized in that: The hardness of the upper high-resilience layer (2) is lower than that of the middle transition layer (7), and the hardness of the middle transition layer (7) is lower than that of the bottom high-density rubber layer (8).

3. The multi-layer composite density foamed shoe sole according to claim 1, characterized in that: The upper high-resilience layer (2) is made of low-density EVA foam or ETPU foam; the middle transition layer (7) is made of medium-high density EVA foam or PHYLON material; and the bottom high-density rubber layer (8) is made of high-density EVA foam, rubber or rubber foam composite material.

4. The multi-layer composite density foamed shoe sole according to claim 1, characterized in that: The connector is a Velcro (10), and the foot pad (1) is also provided with a recessed part (6) to facilitate the Velcro (10) to be accommodated. The first connecting part is the hook side or the loop side of the Velcro (10), and the second connecting part is the loop side or the hook side that matches the Velcro (10).

5. The multi-layer composite density foamed shoe sole according to claim 1, characterized in that: The first connecting part is circumferentially connected to the edge of the soft porous breathable cover plate (5), and the second connecting part is annular and circumferentially arranged around the opening edge of the storage cavity (4).

6. The multi-layer composite density foamed shoe sole according to claim 1, characterized in that: It also includes an activated carbon pack (9) for containing adsorbent material, the activated carbon pack (9) being placed inside the receiving cavity (4) and having a size smaller than that of the receiving cavity (4).

7. The multi-layer composite density foamed shoe sole according to claim 1, characterized in that: A side wrapping layer (3) is also bonded and fixed at the outer edge of the foot pad (1), high resilience layer (2), transition layer (7) and high density rubber layer (8).

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