A type of firmly bonded shoe sole

Abstract

This utility model discloses a firmly bonded shoe sole, belonging to the field of shoe sole manufacturing. The sole includes a first foam layer, a fabric layer, and a rubber sheet layer connected sequentially from top to bottom. The fabric layer is embedded or fused to the underside of the first foam layer. The fabric layer and the rubber sheet layer are connected by an adhesive layer, but there is no adhesive layer between the fabric layer and the first foam layer. This utility model achieves a strong bond between the rubber sheet and the midsole by thermally embedding or fusing the fabric layer to the underside of the first foam layer, and then bonding it to the rubber sheet through an adhesive layer. This ensures stable deep-layer bonding and eliminates the need for an additional adhesive layer, improving both environmental and safety performance.

Description

Technical Field

[0001] This utility model belongs to the field of shoe sole manufacturing, and in particular relates to a shoe sole with strong adhesion. Background Technology

[0002] Current running shoes, especially marathon running shoes, are constantly moving towards lightweight design and high energy return efficiency. As a result, the soles are increasingly made of lighter materials, and foam midsoles with a density of less than 0.1 g / cm³ are gradually appearing on the market. Because these running shoes need to adapt to the environment of long-distance running, the outsole also requires high wear resistance and slip resistance. Therefore, a layer of wear-resistant and slip-resistant rubber is often bonded to the underside of the foam midsole. The adhesion effect between this rubber sheet and the midsole is generally characterized by the bonding tensile strength value, or adhesive tensile strength value. This tensile strength refers to the force required to peel the rubber sheet from the midsole, measured using a tensile testing machine that can continuously record tensile strength. When the bonding tensile strength reaches 20N or more, it is considered that a deep material breaking effect has been achieved; if 15 ≤ bonding tensile strength < 20N, it is considered that only a shallow material breaking effect has been achieved.

[0003] In existing processes, to achieve deep material breaking through the bonding tensile strength, materials with a density of 0.12±0.02 g / cm³ are required. 3 The bonding process for supercritical foam midsoles typically includes: roughening the bonding surface of the midsole → washing the midsole with water → treating the midsole surface with a treatment agent → applying two coats of adhesive and then bonding the midsole and rubber sheet together.

[0004] However, when using this process to bond the lightweight foam midsole to the anti-slip rubber sheet, the bonding tension makes it difficult to achieve deep material penetration, and even difficult to guarantee stable shallow material penetration. This problem is even more prominent when using environmentally friendly recycled materials to make shoe soles. Summary of the Invention

[0005] The purpose of this invention is to propose a firmly bonded sole structure, in which the rubber sheet and midsole are firmly bonded together, and can stably meet the standards for deep material breaking.

[0006] To achieve this objective, the present invention adopts the following technical solution: A firmly bonded shoe sole includes a first foam layer, a fabric layer, and a rubber sheet layer connected sequentially from top to bottom; the fabric layer is embedded or fused to the underside of the first foam layer, the fabric layer and the rubber sheet layer are connected by an adhesive layer, and there is no adhesive layer between the fabric layer and the first foam layer; the coverage area of ​​the fabric layer is at least equal to the coverage area of ​​the rubber sheet layer.

[0007] Furthermore, the fabric layer is embedded or fused to the bottom surface of the first foam layer and extends upward to at least the side surface and top surface of the first foam layer that are embedded or fused to it.

[0008] Furthermore, the thickness of the fabric layer is 0.3mm-0.7mm, and the depth of the fabric layer embedded in the first foam layer is 75%-100% of the fabric layer.

[0009] Furthermore, the fabric layer has multiple perforations, each perforation having an area of ​​0.5 mm. 2 -9 mm 2 .

[0010] Furthermore, the density of the first foamed layer is 0.07 g / cm³. 3 -0.14 g / cm 3 .

[0011] Furthermore, the density of the foamed layer is 0.07 g / cm³. 3 -0.10 g / cm 3 .

[0012] Furthermore, it also includes a support plate, which is embedded in or covered on the upper surface of the first foam layer.

[0013] Furthermore, the fabric layer is embedded at least at the edge of the surface of the first foam layer connected to the support plate.

[0014] Furthermore, the foaming layer is made of environmentally friendly nylon, and the fabric is nylon mesh or polyester mesh.

[0015] Furthermore, the environmentally friendly nylon is Evonik's nylon 12 elastomer VESTAMID® E40 eCO.

[0016] The beneficial effects of this utility model include at least the following: This invention achieves a strong bond between the rubber sheet and the midsole, ensuring stable deep-layer material bonding, by thermally embedding or fusing the fabric layer to the lower surface of the first foam layer and then bonding it to the rubber sheet through an adhesive layer. This also eliminates the need for an adhesive layer (the bonding layer connecting the fabric layer and the foam layer), thus improving environmental and safety performance. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of a firmly bonded shoe sole from a downward angle in a specific embodiment of this utility model; Figure 2 This is a cross-sectional view of a firmly bonded shoe sole in a specific embodiment of this utility model; Figure 3 This is an exploded view of a firmly bonded shoe sole in a specific embodiment of this utility model.

[0018] The labels in the attached diagram are: 10-first foam layer, 20-fabric layer, 3-rubber sheet layer, 40-adhesive layer, 50-support plate, 60-second foam layer. Detailed Implementation

[0019] The present invention will now be further explained and described in conjunction with the accompanying drawings and specific embodiments.

[0020] Contents not described in detail in this specification are existing technologies known to those skilled in the art. In the description of this utility model, it should be understood that terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this utility model and simplifying the description. They 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 limiting this utility model. Furthermore, terms such as "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Reference Figures 1-3 As shown, this utility model provides a firmly bonded shoe sole, which includes a first foam layer 10, a fabric layer 20, and a rubber sheet layer 30. Of these three layers, the rubber sheet layer 30 is located at the bottom, in contact with the ground, providing good slip resistance and wear resistance. The first foam layer 10 is located at the top, and the fabric layer 20 connects the first foam layer 10 and the rubber sheet layer 30. The coverage area of ​​the fabric layer 20 is adapted to the area of ​​the rubber sheet layer 30, and the coverage area of ​​the fabric layer 10 is at least equal to the coverage area of ​​the rubber sheet layer, to ensure the bonding effect between the rubber sheet layer 30 and the first foam layer 10.

[0022] The fabric layer 20 and the rubber sheet layer 30 are connected by an adhesive layer 40. The fabric layer 20 is embedded or fused to the bottom surface of the first foam layer 10. The fabric layer 20 and the first foam layer 10 are not connected by an adhesive, so there is no adhesive layer between them.

[0023] In a specific embodiment of this utility model, the density of the first foaming layer 10 is 0.07 g / cm³. 3 -0.14 g / cm 3 For example, 0.12 g / cm³ 3 0.09g / cm 3 0.07 g / cm 3 The structure and method provided by this invention are particularly suitable for lightweight and environmentally friendly nylon midsoles, which typically have a density of 0.07-0.10 g / cm³. 3 .

[0024] To achieve a connection between the fabric layer 20 and the first foam layer 10 without the need for an adhesive layer, the fabric layer 20 can be hot-pressed or fused to the bottom surface of the first foam layer 10 before the first foam layer 10 is formed. The material of the fabric layer 20 can be common fabric materials such as polyester or nylon, preferably materials that are compatible with the first foam layer 10, as this results in a better connection. For example, the fabric layer 20 can be made of nylon, and the first foam layer 10 can be made of nylon elastomer granules. The rubber sheet can be made of polyurethane casting adhesive or other common shoe sole rubber sheet materials. Because polyurethane casting adhesive rubber sheets have relatively poor adhesion, this invention is particularly suitable for polyurethane casting adhesive rubber sheets.

[0025] In one specific embodiment, Evonik's VESTAMID® E40 eCO nylon 12 elastomer pellets were selected as the raw material for the first foam layer 10. These pellets are a sustainable high-performance plastic that uses end-of-life tires as primary raw materials and is produced using renewable energy sources such as green electricity (biomethane). Compared with conventional products, the carbon footprint is reduced by nearly 42%.

[0026] A method for preparing the material granules into a firmly bonded shoe sole may include the following steps: S1. Obtain nylon fabric, rubber sheet, and the aforementioned nylon elastomer granules from Yingchuang Company. S2. The nylon elastomer granules are foamed into a rough blank using an existing foaming process (e.g., in-mold small-scale foaming process); S3. Place the nylon fabric at the bottom of the cavity of the finished mold, grind the blank and place it on top of the nylon fabric, heat and press the finished mold, the blank is molded into the first foam layer 10, the nylon fabric partially melts under the action of hot pressing, and is embedded or fused to the bottom surface of the first foam layer to form the fabric layer 20. S4. Apply adhesive to the upper surface of the fabric layer 20 or the rubber sheet, and then press it together using an adhesive pressing machine to form a shoe sole having a first foam layer 10, a fabric layer 20 and a rubber sheet layer 30.

[0027] Excessively thick fabric can affect the daily wear comfort of the midsole and the tear strength of the midsole bottom, while excessively thin fabric can affect the overall bonding strength of the sole. As a specific implementation method, the suitable range for the thickness and embedding depth of the fabric layer 20 is: the thickness of the fabric layer 20 is 0.3mm-0.7mm, and the embedding depth of the fabric layer 20 into the first foam layer 10 is 75%-100% of the fabric layer 10. Figures 1-3 The example is an embodiment in which the fabric layer 20 is embedded to a depth of 100% of the first foam layer 10.

[0028] As a further improvement, the fabric layer 20 has multiple perforations, each with an area of ​​0.5 mm. 2 -9mm 2 That is, the fabric is a mesh, and the perforated holes are filled with the first foam layer 10, which is firmly embedded. The area of ​​the perforated holes should not be too large, otherwise it will not help to bond with the rubber sheet, nor should it be too small or too dense, as it will affect the compression and cushioning performance of the sole.

[0029] Cooperate Figure 1 and Figure 3 As shown, as a further improvement, the fabric layer 20 is embedded or fused to the bottom surface of the first foam layer 10 and extends upwards to at least a portion of the side surface and top surface of the first foam layer 10 that are embedded or fused to it. In this way, the fabric layer 20 embedded in the bottom surface of the first foam layer 10 is more secure and less prone to detachment, thereby better ensuring the adhesion to the rubber sheet layer 30. This side can be any side of the shoe, preferably the inner side, which is more conducive to the aesthetics of the outer side.

[0030] Based on this, the sole provided by this utility model further includes a support plate 50, which is embedded or covered on the upper surface of the first foam layer 10; a fabric layer 20 is embedded at least at the edge of the surface of the first foam layer 10 connected to the support plate 50, thus improving the problem of wear of the foam layer caused by long-term continuous friction between the support plate 50 and the first foam layer. The support plate 50 is, for example, a carbon fiber plate, a nylon plate, or a TPU plate. In one specific embodiment, the sole further includes a second foam layer 60, with the support plate 50 sandwiched between the first foam layer 10 and the second foam layer 60. In this case, the sole preparation method further includes step S5: sequentially bonding the support plate 50 and the second foam layer 60 to the upper surface of the first foam layer 10.

[0031] This invention transfers the adhesive tension contradiction between the lightweight foamed midsole (especially the low-density environmentally friendly nylon foamed midsole) and the rubber sheet (especially the polyurethane cast rubber sheet) to the rubber sheet and the fabric layer (especially the mesh), and the fabric layer (especially the mesh) and the lightweight foamed midsole. By thermally embedding or fusing the fabric layer on the lower surface of the first foam layer, and then bonding it to the rubber sheet, the invention achieves a firm bond between the rubber sheet and the midsole, which can stably meet the standards for deep material breaking, while eliminating a layer of adhesive (the adhesive layer connecting the fabric layer and the foam layer), thus improving environmental protection and safety performance.

[0032] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A strong bonded sole, characterized by: It includes a first foam layer, a fabric layer, and a rubber sheet layer connected sequentially from top to bottom; the fabric layer is embedded or fused to the bottom surface of the first foam layer, the fabric layer and the rubber sheet layer are connected by an adhesive layer, and there is no adhesive layer between the fabric layer and the first foam layer; the coverage area of ​​the fabric layer is at least equal to the coverage area of ​​the rubber sheet layer.

2. The bonded shoe sole according to claim 1, wherein: The fabric layer is embedded or fused to the bottom surface of the first foam layer and extends upward to at least the side surface and top surface of the first foam layer that are embedded or fused to it.

3. The bonded sole according to claim 1 or 2, wherein: The thickness of the fabric layer is 0.3mm-0.7mm, and the depth of the fabric layer embedded in the first foam layer is 75%-100% of the fabric layer.

4. The adhered sole according to claim 1, wherein: The fabric layer has a plurality of hollow holes, the area of the hollow hole is 0.5 mm 2 -9 mm 2 .

5. The adhered sole according to claim 1, wherein: The first foamed layer has a density of 0.07 g / cm 3 -0.14 g / cm 3 .

6. The bonded shoe sole of claim 5, wherein: The density of the foamed layer is 0.07 g / cm³. 3 -0.10g / cm 3 .

7. The firmly bonded shoe sole according to claim 1, characterized in that: It also includes a support plate, which is embedded in or covered on the upper surface of the first foam layer.

8. The bonded shoe sole of claim 7, wherein: The fabric layer is embedded at least at the edge of the surface of the first foam layer connected to the support plate.

9. The adhered sole according to claim 1, wherein: The first foaming layer is made of environmentally friendly nylon, and the fabric layer is made of nylon mesh.

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