A method for preparing a sheet-coated foamed bead composite sole

Abstract

The application provides a preparation method of a sheet-coated foamed bead composite shoe sole and a shoe sole. The preparation method comprises the following steps: using the same thermoplastic polyurethane material as a raw material of a bead material and a sheet material, respectively forming foamed beads and foamed sheets after physical foaming; placing a plurality of foamed beads in a mold to form a to-be-molded bead core layer, and arranging the foamed sheet on at least part of the peripheral side of the to-be-molded bead core layer, so that the foamed sheet is in contact with the peripheral surface of the to-be-molded bead core layer; performing hot-pressing treatment on the to-be-molded bead core layer and the foamed sheet, so that the foamed beads in the to-be-molded bead core layer are connected with each other to form a bead core layer, and the contact parts of the foamed beads located on the outer periphery of the bead core layer and the foamed sheet are simultaneously fused and connected to form a connecting interface; and cooling and setting to obtain the sheet-coated foamed bead composite shoe sole. The shoe sole can improve the problem that the outer side wall of the foamed bead shoe sole is easy to drop and break.

Description

Technical Field

[0001] This invention relates to the field of shoe sole technology, specifically to a method for preparing a sheet-coated foamed bead composite shoe sole. Background Technology

[0002] Foamed bead soles are typically made by filling pre-foamed elastomeric beads into a sole mold cavity, and then connecting the surfaces of adjacent foamed beads through steam, hot pressing, or molding to form a foamed structure with the shape of a shoe sole. Due to the microporous structure within the foamed beads, this type of sole can achieve good cushioning and rebound performance at a relatively low density, and is therefore widely used in athletic shoes, casual shoes, and other footwear products. However, the outer surface of a foamed bead sole is usually formed by splicing together a large number of outer bead surfaces, resulting in a granular outline on the sole sidewall. Furthermore, the outer sidewall of the sole is subjected to repeated bending and compression during wear, and the welded interfaces between the outer beads are prone to stress concentration, leading to localized bead shedding and damage after long-term use. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects or problems in the prior art and provide a method for preparing a sheet-coated foamed bead composite sole. The composite sole has a sheet coating on the outside of the foamed bead core layer, which improves the problem of easy shedding and damage of the outer wall of the foamed bead sole.

[0004] The applicant discovered that by covering the foamed bead core layer with a sheet of other materials, such as thermoplastic polyurethane foam, the good abrasion resistance and surface continuity of thermoplastic polyurethane foam can protect the outer periphery of the foamed bead core layer, thereby improving the problems of noticeable granular texture on the sidewalls of the foamed bead sole and the easy loss or damage of the outer beads. However, ordinary covering methods usually only attach or press the sheet to the outside of the foamed bead core layer. The connection between the sheet and the outer beads mainly relies on adhesive and local heat bonding, making it difficult to form a stable interface between the sheet and the bead core layer, which easily leads to sheet peeling during use. If the heat bonding temperature and adhesive pressure are increased to improve the bonding strength, it can easily cause the foam cells on the outside of the sheet and the bead core layer to collapse, making the outer wall of the sole harder, reducing rebound, and affecting the original lightweight and cushioning performance of the foamed bead core layer.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: At least one embodiment discloses a method for preparing a sheet-coated foamed bead composite sole. The method includes: using the same thermoplastic polyurethane material as raw material for bead material and sheet material, respectively, and physically foaming them to form foamed beads and foamed sheets; placing a plurality of the foamed beads in a mold to form a bead core layer to be formed, and arranging the foamed sheets on at least a portion of the periphery of the bead core layer to be formed, so that the foamed sheets are in contact with the periphery surface of the bead core layer to be formed; performing hot pressing treatment on the bead core layer to be formed and the foamed sheets, so that each of the foamed beads in the bead core layer to be formed is connected to each other to form a bead core layer, and simultaneously melting and connecting the contact portion of the foamed beads located on the outer periphery of the bead core layer with the foamed sheets to form a connection interface; cooling and shaping to obtain the sheet-coated foamed bead composite sole.

[0006] In the above design, by coating the outer surface of the foamed bead core layer with a sheet of thermoplastic polyurethane material, the outer periphery of the foamed bead core layer can be effectively protected. Simultaneously, a specific preparation method improves the problems of unstable connection and performance degradation that exist when coating the outer surface of the foamed bead core layer with a sheet. The key technical approach employed in this solution is to use the same thermoplastic polyurethane material for both the beads and the sheet, ensuring good thermal fusion compatibility between the foamed beads and the foamed sheet under hot-pressing conditions. During the hot-pressing process, the foamed beads in the core layer connect to each other to form the core layer, while the foamed beads on the outer periphery of the core layer simultaneously melt and connect with the foamed sheet at their contact points, forming a bonding interface. This technique ensures that the forming of the core layer and the interface bonding between the sheet and the core layer are completed in the same hot-pressing process, thereby ensuring a strong bond between the foamed sheet and the outer periphery of the core layer and reducing the possibility of peeling during subsequent use of the composite sole. Meanwhile, the foamed sheet itself has a cellular structure, and its compression recovery method can be coordinated with the foamed bead core layer, which helps to improve the abrasion resistance of the sidewall while maintaining the lightweight, cushioning and rebound performance of the sole.

[0007] In the preparation method disclosed in at least one embodiment, the same thermoplastic polyurethane material is an irradiated or irradiated crosslinked thermoplastic polyurethane material, and the bead material and the sheet material can be thermally softened or thermally fused together under the hot pressing treatment conditions.

[0008] In the above design, irradiation modification or irradiation crosslinking modification helps thermoplastic polyurethane materials maintain the cell structure after physical foaming and retain the necessary thermal softening ability within the composite molding window, thereby taking into account both the maintenance of foam morphology and interfacial thermal fusion.

[0009] In the preparation method disclosed in at least one embodiment, the physical foaming is supercritical physical foaming using carbon dioxide and / or nitrogen as the foaming medium.

[0010] In the above design, the formation of foam beads and foam sheets through supercritical physical foaming can reduce the impact of chemical foaming residue on the odor, cell stability and interfacial composite state of the shoe sole material, and is conducive to obtaining a more uniform cell structure.

[0011] In the preparation method disclosed in at least one embodiment, the thickness of the foamed sheet is 2.5 mm to 5.0 mm, and the density is 0.095 g / cm³ to 0.10 g / cm³; the foaming ratio of the foamed beads is 5 to 12 times.

[0012] The aforementioned sheet thickness and density give the foamed sheet a certain degree of conformability and sidewall protection, while the limited foaming ratio helps the bead core layer maintain its lightweight and resilience. Together, these two factors achieve a good balance between the continuity of the sidewall coverage and the overall shock absorption performance.

[0013] In the preparation method disclosed in at least one embodiment, the hot pressing temperature is 150 ℃ to 170 ℃, the molding pressure is 5 kg / cm² to 20 kg / cm², and the heat and pressure holding time is 60 s to 300 s.

[0014] The above-mentioned hot-pressing parameters are designed to ensure that the inner surface of the foamed sheet and the outer surface of the foamed beads reach a molten state that can form a connection interface, while avoiding excessive hot pressing that could cause compaction or collapse of the sheet cells and bead cells.

[0015] In the preparation method disclosed in at least one embodiment, after the foamed sheet is formed by physical foaming, the foamed sheet is cut into a sidewall sheet and the sidewall sheet is arranged along the outer peripheral sidewall of the bead core layer to be formed, so as to form a sheet covering layer that continuously covers the sidewall of the bead core layer in the circumferential direction after hot pressing.

[0016] In the above design, the sidewall sheets are arranged continuously along the outer perimeter sidewall. After hot pressing and cooling, a composite sole structure with long continuous sheets is formed on the sidewall of the sole, which facilitates continuous protection of the sole sidewall.

[0017] In at least one embodiment of the preparation method disclosed, the sidewall sheet is formed by enclosing a continuous sheet and forming a seam in the toe area; the ends of the sheet at the seam are overlapped and then fused together, or obliquely overlapped and then fused together, or end faces are joined and then fused together.

[0018] In the above design, by setting the seams in a position that facilitates pressing and trimming, and forming a fusion connection at the seams, the continuity of the circumferential coverage of the sidewall sheets can be improved, and openings at the seams can be avoided.

[0019] In at least one embodiment of the preparation method disclosed, the upper edge of the sidewall sheet extends to the top edge of the core bead layer to be formed, and / or the lower edge of the sidewall sheet extends to the bottom edge of the core bead layer to be formed, and is fused to adjacent foamed beads in the hot pressing process.

[0020] In the above design, the upper and lower edges of the sidewall sheet can achieve stable adhesion within the mold pressing area, reducing edge lifting or local peeling.

[0021] In at least one embodiment of the preparation method, the foamed sheet is preformed into a shell-shaped sheet with continuous sides and bottom and an open top surface. A plurality of foamed beads are filled into the shell-shaped sheet through the top opening to form the core layer of the beads to be formed. After the hot pressing treatment, the inner surface of the shell-shaped sheet is fused to the foamed beads located on the outer periphery.

[0022] In the above design, the shell-shaped sheet material can form a continuous wrap around the junction area between the side and bottom of the sole, which helps to improve the connection stability between the sidewall and the bottom transition area.

[0023] The present invention also discloses a shoe sole, which is made by the preparation method of the sheet-coated foamed bead composite shoe sole described in any of the above-mentioned claims.

[0024] In the above design, the sole includes a bead core layer formed by connecting foam beads and a foam sheet covering at least a portion of the outer periphery of the bead core layer. A fused connection interface is formed between the foam sheet and the outer foam beads, so that the sole can provide both lightweight cushioning and protection of the outer periphery. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the following description of the embodiments will be briefly introduced. It should be understood that the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the preparation process of the sheet-coated foamed bead composite shoe sole according to an embodiment of the present invention; Figure 2 This is a schematic diagram showing the combined state of the core bead layer and the foamed sheet in the preparation method of the sheet-coated foamed bead composite sole according to an embodiment of the present invention.

[0027] Explanation of key figure labels: 10 beads core layer to be formed; 20 foamed sheets. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0030] The present invention relates to a method for preparing a sheet-coated foamed bead composite shoe sole, which mainly includes the following steps: Bead materials and sheet materials using the same thermoplastic polyurethane material as raw material are physically foamed to form foamed beads and foamed sheets, respectively. A plurality of the foamed beads are placed in a mold to form a core layer of beads to be formed, and the foamed sheet is arranged on at least a portion of the periphery of the core layer of beads to be formed, and the foamed sheet is in contact with the periphery surface of the core layer of beads to be formed. The core bead layer and the foamed sheet to be formed are subjected to hot pressing treatment, so that the foamed beads in the core bead layer to be formed are connected to each other to form the core bead layer, and at the same time, the foamed beads located on the outer periphery of the core bead layer are fused to the contact parts of the foamed sheet to form a connection interface. Cooling and shaping yields the sheet-coated foamed bead composite sole.

[0031] Specifically, combined Figure 1 The process is illustrated below, and the steps of the above preparation method will be explained in detail.

[0032] S10, Preparation of foamed beads. A thermoplastic polyurethane material suitable for shoe sole foaming is selected as the bead material. This material can be first irradiated or irradiated crosslinked, and then placed in a pressure-resistant foaming device for physical foaming. Physical foaming can use carbon dioxide, nitrogen, or a mixture of carbon dioxide and nitrogen as the foaming medium. In supercritical physical foaming, the foaming medium penetrates into the thermoplastic polyurethane material, and foaming is triggered by depressurization or heating to obtain foamed beads. After foaming, the foamed beads can be cured, sieved, or stabilized.

[0033] S20, Preparation of foamed sheets. Using sheet material belonging to the same thermoplastic polyurethane material system as the bead material, a sheet blank is first formed by calendering, extrusion, or molding. Then, the sheet blank is physically foamed to obtain the foamed sheet. The foamed sheet can be irradiated or irradiated crosslinked before supercritical physical foaming to obtain a more stable cell structure. The foamed sheet can be cut into sidewall sheets according to the contour of the shoe sole sidewall, or pre-formed into a shell-shaped sheet component with continuous sides and bottom and an open top.

[0034] S30, Arrange the core layer of beads to be formed and the foamed sheet. Fill multiple foamed beads into the core layer forming cavity of the shoe sole mold, so that the foamed beads constitute the core layer of beads to be formed. Then refer to... Figure 2 The sidewall sheet is arranged around the outer peripheral sidewall of the core layer of beads to be formed, or the foamed beads are filled into the shell-shaped sheet through the top opening, so that the foamed sheet is located at least part of the periphery of the core layer of beads to be formed, and the inner surface of the foamed sheet is in contact with the surface of the foamed beads on the periphery of the core layer of beads to be formed.

[0035] S40, Hot Pressing Treatment. After mold closing, the bead core layer and foamed sheet to be formed are subjected to hot pressing treatment. The hot pressing temperature can be 150 ℃ to 170 ℃, the forming pressure can be 5 kg / cm² to 20 kg / cm², and the heat and pressure holding time can be 60 s to 300 s. During the hot pressing process, adjacent foamed beads in the bead core layer to be formed connect with each other under the action of heat and pressure to form the bead core layer. At the same time, the contact area between the foamed beads located on the outer periphery of the bead core layer and the foamed sheet undergoes thermal softening or partial melting, forming a connection interface after cooling.

[0036] S50, Cooling and Shaping. After hot pressing, the composite sole inside the mold is cooled and shaped to stabilize the bead core layer, foam sheet, and the interface between them. After cooling, the composite sole is removed, and the edges, seams, or excess sheet are trimmed as needed to obtain a sheet-covered foam bead composite sole.

[0037] Furthermore, specific embodiments of the present invention also relate to a shoe sole, which is a shoe sole prepared using the above-described preparation method. The shoe sole includes a bead core layer formed by connecting foamed beads and a foamed sheet covering at least a portion of the periphery of the bead core layer, wherein the foamed sheet and the foamed beads located on the outer periphery of the bead core layer form a fused interface.

[0038] To further illustrate the interfacial bonding effect of the sheet-coated foamed bead composite sole involved in this invention, the following embodiments and comparative examples are provided.

[0039] In the following examples and comparative examples, the raw materials used are distinguished by the physical properties of thermoplastic polyurethane materials. The bead materials and sheet materials of Examples 1 to 3 belong to the same thermoplastic polyurethane material system. They are all materials that are suitable for supercritical physical foaming with carbon dioxide and / or nitrogen after being modified by irradiation or crosslinking by irradiation. After foaming, the bead material forms foamed beads with a foaming ratio of 5 to 12 times, and the sheet material forms foamed sheets with a thickness of 2.5 mm to 5.0 mm and a density of 0.095 g / cm³ to 0.10 g / cm³. Both can be thermally softened or partially melted to form a molten interface under hot pressing conditions of 150 ℃ to 170 ℃, 5 kg / cm² to 20 kg / cm², and 60 s to 300 s. Comparative Example 1 uses the same type of thermoplastic polyurethane material to form a common dense sheet, but does not undergo physical foaming treatment, and therefore does not have the low-density cell structure of the above-mentioned foamed sheet; the continuous adhesive layer of Comparative Example 2 uses a hot melt adhesive type thermoplastic polyurethane material that can soften under hot pressing conditions and form a continuous film layer, as an intermediate connecting layer between the foamed sheet and the core layer of the beads to be formed.

[0040] Example 1 This embodiment prepares a composite shoe sole with a sidewall-encased sheet covering foamed beads. A thermoplastic polyurethane material suitable for shoe sole foaming is selected as the bead material. This bead material, after irradiation modification, is suitable for supercritical carbon dioxide physical foaming and can form foamed beads with a foaming ratio of 8. The sheet material and the bead material belong to the same thermoplastic polyurethane material system. After irradiation modification and supercritical carbon dioxide physical foaming, a foamed sheet with a thickness of 3.5 mm and a density of 0.098 g / cm³ is formed. Under hot-pressing conditions of 160 ℃, 10 kg / cm², and 180 s, this foamed sheet can soften or partially melt the surface of the outer foamed beads to form a bonding interface. The foamed sheet is cut into sidewall sheets. Foamed beads are filled into a shoe sole mold to form the core layer of the beads to be formed. The sidewall sheets are arranged along the outer sidewall of the core layer of the beads to be formed, so that the inner surface of the sidewall sheets is in contact with the surface of the outer foamed beads. After molding, the material is hot-pressed at 160 ℃ and 10 kg / cm² for 180 s, then cooled and shaped, and the edges are trimmed to obtain a sheet-covered foamed bead composite sole.

[0041] Example 2 This embodiment prepares another type of sidewall-encased sheet-coated foamed bead composite sole. A thermoplastic polyurethane material suitable for sole foaming is selected as the bead material. This bead material, after irradiation crosslinking modification, is suitable for supercritical nitrogen physical foaming and can form foamed beads with a foaming ratio of 5. The sheet material and the bead material belong to the same thermoplastic polyurethane material system. After irradiation crosslinking modification and supercritical nitrogen physical foaming, a foamed sheet with a thickness of 2.5 mm and a density of 0.095 g / cm³ is formed. This foamed sheet can form a bonding interface with the outer foamed bead surface layer under hot-pressing conditions of 150 ℃, 5 kg / cm², and 300 s through thermal softening or partial melting. The foamed sheet is cut into a continuous sidewall sheet, which is then used to enclose the outer sidewall of the bead core layer to be formed, and a beveled lap joint is formed in the toe area. After molding, the material is hot-pressed at 150 ℃ and 5 kg / cm² for 300 s, and then cooled and shaped to obtain a composite sole with circumferentially continuous sidewall sheet covering.

[0042] Example 3 This embodiment prepares a shell-shaped sheet-covered composite shoe sole. A thermoplastic polyurethane material suitable for shoe sole foaming is selected as the bead material. This bead material, after irradiation crosslinking modification, is suitable for supercritical physical foaming with a mixture of carbon dioxide and nitrogen, and can form foamed beads with a foaming ratio of 12. The sheet material and the bead material belong to the same thermoplastic polyurethane material system. After irradiation crosslinking modification and supercritical physical foaming, a foamed sheet with a thickness of 5.0 mm and a density of 0.10 g / cm³ is formed. Under hot-pressing conditions of 170 ℃, 20 kg / cm², and 60 s, this foamed sheet can soften or partially melt the surface layer of the outer foamed beads to form a bonding interface. The foamed sheet is pre-formed by hot pressing into a shell-shaped sheet with continuous sides and bottom and an open top. Foamed beads are filled into the shell-shaped sheet through the top opening, forming the core layer of the beads to be formed. After molding, the material is hot-pressed at 170 ℃ and 20 kg / cm² for 60 s to fuse the inner surface of the shell-shaped sheet material with the surface layer of the foamed beads on the outer periphery. After cooling and shaping, a composite sole with continuous coverage on the sides and bottom is obtained.

[0043] Comparative Example 1 The difference between this comparative example and Example 1 is that the sheet used is a common dense thermoplastic polyurethane sheet. This sheet belongs to the same thermoplastic polyurethane material system as the sheet used in Example 1, but it has not undergone physical foaming treatment, and therefore has not formed a foamed sheet cell structure with a density of 0.095 g / cm³ to 0.10 g / cm³. After the sheet comes into contact with the outer peripheral sidewall of the core layer of the beads to be formed, it is composite molded under the same hot-pressing conditions as in Example 1. The remaining foamed bead materials, foaming ratio, mold arrangement, and cooling and shaping methods are the same as in Example 1.

[0044] Comparative Example 2 The difference between this comparative example and Example 1 is that a continuous adhesive layer is provided between the foamed sheet and the core layer of the beads to be formed. This continuous adhesive layer is formed of a hot-melt thermoplastic polyurethane material that can soften under hot pressing and form a continuous film. The sheet and the outer foamed beads are mainly connected through this continuous adhesive layer, rather than by direct fusion bonding between the foamed sheet and the surface of the outer foamed beads. The remaining foamed beads, foamed sheet, mold arrangement, and hot pressing conditions are the same as in Example 1.

[0045] The performance of the shoe soles prepared in the above embodiments and comparative examples was tested, and the test items are as follows: Peel performance test: A 10 mm wide strip sample was cut from the sidewall covering area of ​​the shoe sole. One end of the foam sheet was pre-peeled from the bead core layer by approximately 20 mm and clamped in the upper and lower fixtures of the tensile testing equipment. A 180° peel was performed at a speed of 100 mm / min. The average peel force during the stable peeling stage was recorded and converted to peel strength according to the sample width, in N / cm. Five samples were tested for each type, and the average value was taken.

[0046] In the test results, the sheets and bead core layers of Examples 1 to 3 all exhibited high peel stability. During the peeling process, in Example 1, the interface between the sheet and the core layer did not peel continuously, with localized damage to the bead surface; in Example 2, the seam area did not open, and the interface peeling path was discontinuous; in Example 3, the shell-shaped sheet and the bead core layer were stably bonded, and no hollow areas appeared in the side bottom transition area.

[0047] In contrast, in Comparative Example 1, continuous interfacial delamination was more likely to form between the dense sheet and the sidewalls of the beads; in Comparative Example 2, delamination mainly occurred at the continuous adhesive layer, with localized residual adhesive layers visible. The above comparison results show that Examples 1 to 3, using the same thermoplastic polyurethane material system to form foamed beads and foamed sheets, and achieving a fused interface between the foamed sheet and the peripheral foamed beads during hot pressing, can improve the delamination stability between the sheet and the core layer of the foamed beads compared to the dense sheet composite method and the continuous adhesive layer connection method.

[0048] The descriptions of the foregoing specification and embodiments are used to explain the scope of protection of the present invention, but do not constitute a limitation on the scope of protection of the present invention. Without departing from the concept of the present invention, those skilled in the art can make modifications, equivalent substitutions, or other improvements to the embodiments of the present invention or some of its technical features based on ordinary technical knowledge and existing technology. All such modifications, equivalent substitutions, or other improvements should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a sheet-coated foamed bead composite shoe sole, characterized in that, Includes the following steps: Bead materials and sheet materials using the same thermoplastic polyurethane material as raw material are physically foamed to form foamed beads and foamed sheets, respectively. A plurality of the foamed beads are placed in a mold to form a core layer of beads to be formed, and the foamed sheet is arranged on at least a portion of the periphery of the core layer of beads to be formed, and the foamed sheet is in contact with the periphery surface of the core layer of beads to be formed. The core bead layer and the foamed sheet to be formed are subjected to hot pressing treatment, so that the foamed beads in the core bead layer to be formed are connected to each other to form the core bead layer, and at the same time, the foamed beads located on the outer periphery of the core bead layer are fused to the contact parts of the foamed sheet to form a connection interface. Cooling and shaping yields the sheet-coated foamed bead composite sole.

2. The method for preparing a sheet-coated foamed bead composite shoe sole as described in claim 1, characterized in that, The same thermoplastic polyurethane material is a thermoplastic polyurethane material that has been irradiated or irradiated crosslinked, and the material for beads and the material for sheets can be thermally softened or thermally fused together under the hot pressing treatment conditions.

3. The method for preparing a sheet-coated foamed bead composite shoe sole as described in claim 1, characterized in that, The physical foaming is supercritical physical foaming using carbon dioxide and / or nitrogen as the foaming medium.

4. The method for preparing a sheet-coated foamed bead composite shoe sole as described in claim 1, characterized in that, The thickness of the foamed sheet is 2.5 mm to 5.0 mm, and the density is 0.095 g / cm³ to 0.10 g / cm³; the foaming ratio of the foamed beads is 5 to 12 times.

5. The method for preparing a sheet-coated foamed bead composite shoe sole as described in claim 1, characterized in that, The hot pressing temperature is 150 ℃ to 170 ℃, the molding pressure is 5 kg / cm² to 20 kg / cm², and the heat and pressure holding time is 60 s to 300 s.

6. The method for preparing a sheet-coated foamed bead composite shoe sole as described in claim 1, characterized in that, in After being physically foamed to form a foamed sheet, the foamed sheet is cut into sidewall sheets and arranged along the outer peripheral sidewall of the bead core layer to be formed, so as to form a sheet covering layer that continuously covers the sidewall of the bead core layer in the circumferential direction after hot pressing.

7. The method for preparing a sheet-coated foamed bead composite shoe sole as described in claim 6, characterized in that, The sidewall sheet is formed by a continuous sheet and a seam is formed in the toe area; the ends of the sheet at the seam are overlapped and then fused together, or they are overlapped at an angle and then fused together, or the ends are joined together and then fused together.

8. The method for preparing a sheet-coated foamed bead composite shoe sole as described in claim 6, characterized in that, The upper edge of the sidewall sheet extends to the top edge of the core layer of the beads to be formed, and / or the lower edge of the sidewall sheet extends to the bottom edge of the core layer of the beads to be formed, and is fused to the adjacent foamed beads during the hot pressing process.

9. The method for preparing a sheet-coated foamed bead composite shoe sole as described in claim 1, characterized in that, The foamed sheet is preformed into a shell-shaped sheet with continuous sides and bottom and an open top surface. Multiple foamed beads are filled into the shell-shaped sheet through the top opening to form the core layer of the beads to be formed. After the hot pressing treatment, the inner surface of the shell-shaped sheet is fused to the foamed beads located on the outer periphery.

10. A shoe sole, characterized in that, It is made using the preparation method of sheet-coated foamed bead composite sole as described in any one of claims 1-9.

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