Polyurethane low-density high-compression insole

Abstract

The utility model relates to the technical field of insoles, in particular to a polyurethane low-density high-compression insole which comprises a bottom layer, a middle layer and a surface layer. The bottom layer is made of a wear-resistant polyurethane material and is provided with anti-skid lines and air holes; the middle layer is composed of polyurethane foaming columns arranged in a honeycomb shape, and gaps are filled with elastic fiber materials. And the surface layer is made of a skin-friendly polyurethane material and is provided with convex points and a waterproof coating. All the layers are combined through a hot press molding process, the overall density is controlled to be 0.12 g / cm < 3 > or below, the rebound rate is larger than 50%, the compression rate is smaller than 8%, and the thickness of the middle layer accounts for 60%-70% of the total thickness of the insole. Light weight, high buffering performance and excellent supporting effect can be achieved, the wearing comfort is remarkably improved, and the problem that an existing insole is insufficient in low density and high compression performance is solved.

Description

Technical Field

[0001] This utility model belongs to the field of footwear manufacturing and functional insole technology, specifically a polyurethane low-density high-compression insole. Background Technology

[0002] With the development of the insole industry, various types of insoles have been widely used in daily life, sports, and medical orthopedic settings. However, in actual use, existing insoles still have many problems that need to be solved. Most insoles on the market today use traditional materials and technologies, which are insufficient in terms of low density and high compression performance, making it difficult to simultaneously meet the needs of comfort and support. This deficiency leads to foot fatigue and discomfort for users during prolonged wear or high-intensity activities, affecting the overall user experience.

[0003] A search revealed that patent CN113279132B discloses a woven fabric and insole. This design improves breathability and heat dissipation by incorporating multiple parallel straight woven strips in the second surface layer, combined with a middle layer and a first surface layer. However, this insole structure has a high material density, failing to meet the requirements for low density, and performs poorly in terms of high compression performance, making it difficult to provide sufficient cushioning and support. Prolonged use may lead to foot fatigue. Furthermore, patent CN106491260B discloses an orthotic insole with a multi-layered structure, including an insole layer, a first insertion layer, and a second insertion layer, which can distribute foot pressure and provide some corrective effect. However, this design also suffers from high material density and insufficient high compression performance, failing to fully meet users' requirements for comfort and support, especially during prolonged exercise or standing, where feet are prone to fatigue and discomfort.

[0004] In conclusion, the shortcomings of existing insole technology in terms of low density and high compressibility have become key issues restricting its further development. Therefore, developing an insole that combines low density and high compressibility to improve comfort, alleviate foot fatigue, and adapt to various usage scenarios has significant practical importance and application value. Utility Model Content

[0005] To address the shortcomings of existing insoles mentioned in the background art in terms of low density and high compression performance, which result in insufficient comfort and support, leading to poor wearing experience and fatigue after prolonged use.

[0006] This invention provides a low-density, high-compression polyurethane insole to achieve lightweight, high cushioning performance, and excellent support. The insole comprises a bottom layer, a middle layer, and a top layer, with the middle layer between the bottom and top layers. The bottom, middle, and top layers are bonded together by a thermoforming process. The middle layer consists of multiple independent polyurethane foam columns arranged in a honeycomb pattern to give the insole low density and high compressibility.

[0007] Furthermore, the bottom layer is made of wear-resistant polyurethane material, and the surface of the bottom layer has anti-slip textures. The anti-slip textures are distributed in a wave shape to enhance the friction between the insole and the sole and prevent the insole from shifting.

[0008] Furthermore, multiple ventilation holes are spaced apart on the bottom layer, and these ventilation holes penetrate the bottom layer and connect with the middle layer to allow air circulation inside the insole and improve breathability.

[0009] Furthermore, the polyurethane foam columns in the middle layer are of uniform height, with gaps between them filled with elastic fiber material to enhance the insole's resilience and pressure resistance.

[0010] Furthermore, the surface layer is made of skin-friendly polyurethane material, and the surface has multiple raised points that are evenly distributed on the surface to provide foot massage function and improve wearing comfort.

[0011] Furthermore, a waterproof coating is provided at the edge of the surface layer, covering the junction between the surface layer and the middle layer to prevent liquid from seeping into the insole and extend the insole's lifespan.

[0012] Furthermore, the bottom layer and the top layer are connected by a hot melt adhesive film, which is evenly distributed between the bottom layer and the top layer to ensure the stability and durability of the overall structure of the insole.

[0013] Furthermore, the polyurethane foam column has a hexagonal cross-section to ensure that the pressure is evenly distributed when the polyurethane foam column is compressed, thus preventing local collapse.

[0014] Furthermore, the thickness of the middle layer is 60%-70% of the total thickness of the insole, so that the insole has sufficient cushioning performance while ensuring low density.

[0015] Furthermore, the overall density of the bottom, middle, and top layers is controlled below 0.12 g / cm³, the overall rebound rate of the bottom, middle, and top layers is greater than 50%, and the overall compression rate of the bottom, middle, and top layers is less than 8%, in order to meet the lightweight requirements of the insole and improve wearing comfort. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the polyurethane low-density high-compression insole of this utility model;

[0017] Figure 2 This is a lower-view schematic diagram of the polyurethane low-density high-compression insole of this utility model.

[0018] Figure 3 This is a schematic diagram illustrating the internal structure of the polyurethane low-density high-compression insole of this utility model.

[0019] Figure 4 This is a partially enlarged view of the middle layer of the polyurethane low-density high-compression insole of this utility model.

[0020] In the diagram: 1. Bottom layer; 11. Anti-slip texture; 12. Ventilation holes; 2. Middle layer; 21. Polyurethane foam columns; 22. Elastic fiber material; 3. Surface layer; 31. Raised points; 32. Waterproof coating; 4. Hot melt adhesive film. 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.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The utility model will be further described in detail below with reference to the accompanying drawings.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 or an electrical 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 utility model according to the specific circumstances.

[0024] This utility model provides a polyurethane low-density high-compression insole, which includes a bottom layer 1, a middle layer 2 and a top layer 3. The bottom layer 1 and the top layer 3 are bonded together by a hot-pressing process, while the middle layer 2 is composed of multiple independent polyurethane foam columns 21. These foam columns are arranged in a honeycomb pattern to achieve the low density and high compression performance of the insole.

[0025] In the specific implementation process, the bottom layer 1 is made of wear-resistant polyurethane material, and its surface is provided with anti-slip texture 11, which is distributed in a wavy pattern, as shown in the attached figure. Figure 2 As shown. This wavy anti-slip pattern significantly enhances the friction between the insole and the sole, effectively preventing the insole from shifting during use. Furthermore, the bottom layer 1 has multiple ventilation holes 12 spaced apart, which penetrate the bottom layer 1 and connect to the middle layer 2, as shown in the attached diagram. Figure 3 As shown. The ventilation holes 12 allow air to circulate inside the insole, thereby improving the overall breathability of the insole and enhancing the wearer's foot comfort. In practical applications, the number and density of the ventilation holes 12 can be adjusted according to the specific size of the insole and the usage scenario. For example, in sports insoles, the number of ventilation holes can be appropriately increased to meet the heat dissipation requirements during high-intensity exercise.

[0026] Middle layer 2 is the core part of the insole, and its structure is shown in the attached diagram. Figure 3 and Figure 4 As shown. The intermediate layer 2 consists of multiple independent polyurethane foam columns 21. These foam columns have a uniform height and a hexagonal cross-section. The hexagonal shape allows the foam columns to evenly distribute pressure when compressed, preventing localized collapse. Gaps are left between the foam columns 21, and these gaps are filled with elastic fiber material 22, as shown in the attached diagram. Figure 3 As shown. The addition of elastic fiber material 22 not only enhances the insole's resilience and compression resistance but also maintains its shape stability after prolonged use. The thickness of the intermediate layer 2 is set to 60%-70% of the total insole thickness, a proportion that provides sufficient cushioning while ensuring a low insole density. For example, in an insole with a total thickness of 10mm, the thickness of the intermediate layer 2 can be set to 6mm to 7mm to ensure excellent cushioning while maintaining a lightweight design.

[0027] Surface layer 3 is made of skin-friendly polyurethane material, and its surface has multiple raised points 31, as shown in the attached image. Figure 1As shown. These raised points 31 are evenly distributed on the surface layer 3, providing a massage function for the feet and thus improving wearing comfort. In actual use, the height and density of the raised points 31 can be adjusted according to the needs of the target user group. For example, for the elderly or people who need foot care, the height and density of the raised points can be appropriately increased to enhance the massage effect. In addition, the edge of the surface layer 3 is provided with a waterproof coating 32, which covers the connection between the surface layer 3 and the intermediate layer 2, as shown in the attached figure. Figure 1 As shown. The waterproof coating 32 effectively prevents liquid from seeping into the insole, thereby extending the insole's lifespan. In practice, the waterproof coating 32 can be made of environmentally friendly waterproof materials to meet modern consumers' demands for environmental performance.

[0028] The bottom layer 1 and the top layer 3 are connected by a hot melt adhesive film 4, which is evenly distributed between the bottom layer 1 and the top layer 3, as shown in the attached figure. Figure 2 As shown, the use of hot melt adhesive film 4 ensures the stability and durability of the overall insole structure. In the hot-press molding process, the hot melt adhesive film 4 melts at high temperature and penetrates the contact surface between the bottom layer 1 and the top layer 3, forming a strong adhesive layer after cooling. This bonding method not only improves the overall strength of the insole but also avoids the release of harmful substances that may occur with traditional adhesive bonding. In actual production, the thickness of the hot melt adhesive film 4 can be adjusted according to the specific requirements of the insole. For example, in sports insoles requiring higher strength, the thickness of the hot melt adhesive film can be appropriately increased to enhance the connection strength.

[0029] The overall density of the insole is controlled below 0.12 g / cm³, the overall rebound rate of the bottom, middle, and top layers is greater than 50%, and the overall compression rate of the bottom, middle, and top layers is less than 8%, to meet the requirements of lightweight design and improve wearing comfort. In practice, this can be achieved by adjusting the expansion ratio of the polyurethane foam columns 21 and the filling amount of elastic fiber material 22. For example, in an insole for running shoes, the density of the polyurethane foam columns 21 can be controlled to around 0.10 g / cm³ by optimizing the foaming process, while filling the gaps with an appropriate amount of elastic fiber material 22 to ensure that the insole is lightweight yet possesses good cushioning performance and resilience.

[0030] The insole of this invention exhibits excellent performance in practical use. For example, in a sports shoe, the bottom layer 1 of the insole is tightly fitted to the sole through a wavy anti-slip texture 11, preventing the insole from shifting during vigorous exercise. The ventilation holes 12 allow air to circulate inside the insole, effectively reducing foot temperature and sweat buildup. The polyurethane foam pillars 21 of the middle layer 2 can evenly distribute pressure when subjected to foot pressure and quickly return to their original shape through the elastic fiber material 22, thus providing excellent cushioning and support. The raised points 31 of the surface layer 3 provide continuous massage stimulation to the foot, relieving foot fatigue, while the waterproof coating 32 effectively prevents rainwater or sweat from seeping into the insole, extending its service life.

[0031] Furthermore, the insole of this invention is suitable for various application scenarios. For example, in everyday casual shoes, the insole can provide users with a comfortable foot massage experience by optimizing the setting of the raised points 31; in professional sports shoes, the insole can meet the needs of high-intensity sports by increasing the number of ventilation holes 12 and optimizing the thickness of the middle layer 2; in shoes specifically designed for the elderly, the insole can improve the foot health of the elderly by enhancing the cushioning performance of the middle layer 2 and the massage function of the surface layer 3. In summary, the insole of this invention, through its scientific and reasonable structural design and material selection, successfully solves the shortcomings of existing insoles in terms of low density and high compression performance, significantly improving the wearing experience.

[0032] In summary, the polyurethane low-density, high-compression insole of this invention enhances stability and breathability through the anti-slip texture 11 and ventilation holes 12 in the bottom layer 1; combines low density and high compression performance through the honeycomb-shaped polyurethane foam columns 21 in the middle layer 2; improves wearing comfort and durability through the raised points 31 and waterproof coating 32 in the surface layer 3; and ensures the stability and consistency of the overall insole structure through the use of a hot melt adhesive film 4. These features enable the insole to exhibit excellent performance in practical applications, meet the needs of different user groups, and have broad application prospects.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A polyurethane low density high compression insole, characterized in that, It comprises a bottom layer (1), a middle layer (2) and a surface layer (3), the middle layer (2) is arranged between the bottom layer (1) and the surface layer (3), the bottom layer (1), the middle layer (2) and the surface layer (3) are combined into one by a hot-press forming process, the middle layer (2) is composed of a plurality of independent polyurethane foaming columns (21), and the polyurethane foaming columns (21) are arranged in a honeycomb shape.

2. The polyurethane low density high compression insole of claim 1, wherein, The bottom layer (1) is made of wear-resistant polyurethane material, the surface of the bottom layer (1) is provided with anti-skid lines (11), the anti-skid lines (11) are distributed in a wave shape, a plurality of air holes (12) are arranged on the bottom layer (1) at intervals, and the plurality of air holes (12) penetrate through the bottom layer (1) and communicate with the middle layer (2).

3. The polyurethane low density high compression insole of claim 1, wherein, The polyurethane foaming columns (21) of the middle layer (2) are of the same height, gaps are left between the polyurethane foaming columns (21), the gaps are filled with elastic fiber material (22), the cross section of the polyurethane foaming column (21) is hexagonal, and the thickness of the middle layer (2) is 60%-70% of the total thickness of the insole.

4. The polyurethane low density high compression insole of claim 1, wherein, The surface layer (3) is made of skin-friendly polyurethane material, the surface of the surface layer (3) is provided with a plurality of raised points (31), the plurality of raised points (31) are uniformly distributed on the surface layer (3), and the edge of the surface layer (3) is provided with a waterproof coating (32) covering the connection between the surface layer (3) and the middle layer (2).

5. The polyurethane low density high compression insole of claim 1, wherein, The bottom layer (1) and the surface layer (3) are connected through a hot melt adhesive film (4), and the hot melt adhesive film (4) is uniformly distributed between the bottom layer (1) and the surface layer (3).

6. The polyurethane low density high compression insole of claim 1, wherein, The overall density of the bottom layer (1), the middle layer (2) and the surface layer (3) is controlled to be below 0.12 g / cm³, the overall resilience of the bottom layer (1), the middle layer (2) and the surface layer (3) is greater than 50%, and the overall compression rate of the bottom layer (1), the middle layer (2) and the surface layer (3) is less than 8%.

7. The polyurethane low density high compression footbed of claim 3, wherein, The height of the polyurethane foaming column (21) ranges from 3mm to 8mm, and the filling density of the elastic fiber material (22) is 0.05g to 0.1g per cubic centimeter.

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