Comolding shoe components and methods of making

Abstract

The invention provides a common-molding shoe component and a preparation method thereof, the shoe component comprises an outsole and an insole, one side of the outsole is provided with a plurality of anchoring structures, and the anchoring structures can be in a convex, concave or through hole form; the midsole is formed through physical foaming of supercritical fluid and is combined with the outsole at the same time, a part of the midsole is completely combined with the anchoring structures, and therefore firmness of the outsole and the midsole after combination is enhanced in the mode that the contact surface area is increased. The preparation method comprises the following steps: transferring the prepared outsole into a mold, controlling the gas pressure value in the mold, injecting a thermoplastic foaming fluid material, and foaming the thermoplastic foaming fluid material in a pressure relief manner to form the midsole and combine the midsole with the outsole into a whole.

Description

Technical Field

[0001] This invention relates to footwear products, and more particularly to a co-molded footwear component and its preparation method. Background Technology

[0002] Shoes are generally composed of a sole and an upper. The sole is further divided into a mainsole and a midsole, depending on functional requirements. The mainsole is used for ground contact, while the midsole typically absorbs shock. These components—outsole, midsole, and upper—are independent parts, requiring cumbersome assembly processes, which not only increases manufacturing costs but also reduces efficiency. Furthermore, the midsole is usually made using chemical foaming, which is prone to unstable dimensional shrinkage during manufacturing. This can lead to mismatches or glue overflow during the subsequent bonding process with the mainsole. Therefore, the midsole needs to be ground and sculpted to the correct size before bonding, further increasing the workload. In addition, adhesives are toxic, posing health risks to workers and damaging the environment.

[0003] While casting PU is used to manufacture midsoles and co-mold them with the outsole, a chemical reaction is still required to achieve adhesion between the two. Furthermore, the cast PU contains cross-linking agents, making the cast PU midsoles difficult to recycle. Another method involves injection molding to create the midsole and co-mold it with the outsole. However, the temperature and pressure generated in injection molding are far lower than those in traditional co-molding, resulting in a lower than safe adhesion between the physically foamed midsole and outsole. This poses a potential safety hazard as the midsole may peel off during wear. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a co-molded shoe component and a method for preparing the same, which can improve the bonding strength between the components of the shoe component without the use of adhesives.

[0005] To achieve the above objectives, the present invention provides a co-molded shoe component comprising an outsole and a midsole, wherein the outsole includes a bonding surface and a plurality of anchoring structures located on the bonding surface, the total surface area of ​​the anchoring structures and the bonding surface being A, and the ratio of the surface area A to the surface area B of an imaginary bonding surface without anchoring structures being A / B greater than 1; the midsole is formed by physical foaming with a supercritical fluid, and the midsole includes a bonding surface, the bonding surface of the midsole bonding the bonding surface and the anchoring structures.

[0006] The present invention also provides a method for manufacturing a co-molded shoe component, comprising: manufacturing an outsole having a bonding surface and a plurality of anchoring structures located on the bonding surface, the number of such anchoring structures being 40 to 180 per square centimeter; transferring the outsole into a mold and reserving a foaming space within the mold; controlling the gas pressure within the mold to be greater than or equal to 5 bar and less than or equal to 50 bar; injecting a thermoplastic foaming fluid material into the foaming space of the mold, the thermoplastic foaming fluid material comprising a supercritical fluid; releasing the gas pressure within the mold, the thermoplastic foaming fluid material foaming to form a physically foamed midsole, the midsole having a bonding surface that bonds the bonding surface of the outsole to the anchoring structures; opening the mold and removing a shoe component comprising the outsole and the midsole.

[0007] The advantage of this invention is that the physically foamed midsole is bonded to the outsole in the mold by co-molding, and the outsole has multiple anchoring structures to increase the contact surface area with the midsole, thereby improving the bonding strength between the midsole and the outsole. Furthermore, no adhesive is required during the bonding process between the outsole and the midsole. Attached Figure Description

[0008] Figure 1 This is a perspective view of a common-mold shoe-making component according to a preferred embodiment of the present invention;

[0009] Figure 2 for Figure 1 Sectional view in direction 2-2;

[0010] Figure 3 for Figure 2 A magnified view of part A marked in the image;

[0011] Figure 4 This is a perspective view of the outsole in the co-molding shoe component of the preferred embodiment of the present invention.

[0012] Figure 5 for Figure 4 Top view;

[0013] Figure 6 for Figure 5 A 6-6 sectional view;

[0014] Figure 7 for Figure 6 A magnified view of a portion of the structure shown;

[0015] Figure 8 For use in making Figure 6 The diagram shows a schematic of the mold for the base structure.

[0016] Figure 9This is a flowchart of a preferred embodiment of the preparation method of a co-molded shoe component according to the present invention;

[0017] Figure 10 This is a schematic diagram of a mold used to realize co-molded shoe components;

[0018] Figure 11 A schematic diagram of a mold used to realize another type of co-molded shoe component;

[0019] Figure 12 To utilize Figure 11 A schematic diagram of a shoe component made using the mold shown.

[0020] Figure 13 The enlarged view shows that the anchoring structure of the outsole is a convex shape that is narrow at the top and wide at the bottom.

[0021] Figure 14 The enlarged view shows that the anchoring structure of the outsole is a convex shape that is wider at the top and narrower at the bottom.

[0022] Figure 15 The enlarged view shows that the anchoring structure of the outsole is a recessed depression.

[0023] Figure 16 The enlarged view shows that the anchoring structure of the outsole is a through hole;

[0024] Figure 17 The enlarged view shows that the anchoring structure of the outsole is a through hole that is narrow at the top and wide at the bottom.

[0025] Figure 18 This is a perspective view of the outsole in a co-molded shoe component according to another preferred embodiment of the present invention;

[0026] Figure 19 for Figure 18 Sectional view along direction 19-19;

[0027] Figure 20 This is a magnified view of a portion of the design, showing that the root width of the anchoring structure varies in different areas.

[0028] Figure 21 This is a magnified view of a portion of the design, showing that the anchoring structure of the outsole extends in different directions in different areas.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100, 100A: Shoe components;

[0031] 10: The bottom;

[0032] 11: Bottom;

[0033] 12: The surface being bonded;

[0034] 13, 13A, 13B, 13C, 13D: Protrusions;

[0035] 13a: Root;

[0036] 13b: Top;

[0037] 14: Depression;

[0038] 15: Through hole;

[0039] 16: Through hole;

[0040] 16a: Open at the top;

[0041] 16b: Open at the bottom;

[0042] 20: Midsole;

[0043] 21: Mating surface;

[0044] 22: Top surface;

[0045] 30: Shoe upper;

[0046] 31: Base fabric surface;

[0047] 40: Main base;

[0048] 41: Main body;

[0049] 42: Side wall;

[0050] 43: The surface being bonded;

[0051] A: The total surface area of ​​the anchoring structure and the surface to which the two surfaces are joined in this invention;

[0052] B: The surface area of ​​the hypothetical bonded surface that does not have a fixed anchoring structure;

[0053] A1: Zone 1;

[0054] A2: Second Zone;

[0055] C: A range of one square centimeter;

[0056] D1: First direction;

[0057] D2: Second direction;

[0058] G: Spacing between adjacent anchorage structures;

[0059] H: The height from the base to the top of the protrusion;

[0060] S, S1: Foaming space;

[0061] W1, W3: Top width;

[0062] W2, W4: Root width;

[0063] 200: Mold;

[0064] 201: Mold cavity;

[0065] 202: Concave hole;

[0066] 203: Upper mold;

[0067] 204: Lower mold;

[0068] 300: Mold;

[0069] 301: Mold cavity;

[0070] 400: Lasting head. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0072] To more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. Figures 1 to 3 As shown, a preferred embodiment of the present invention, a co-molded shoe component 100, includes an outsole 10 and a midsole 20. The outsole 10 is pre-fabricated and placed in a mold, and then bonded to the midsole 20 within the mold through a physical foaming process. The structural relationship between the outsole 10 and the midsole 20 will be explained first, followed by the method for manufacturing the shoe component 100.

[0073] like Figures 4 to 6 As shown, the outsole 10 of this embodiment has a bottom surface 11 for contacting the ground, and a bonding surface 12 disposed opposite to the bottom surface 11. Multiple anchoring structures are integrally formed on the bonding surface 12 of the outsole 10. The total surface area of ​​these anchoring structures and the bonding surface 12 is A. The ratio of this surface area A to the surface area B of an imaginary bonding surface without anchoring structures is A / B, which is greater than 1. The aforementioned bonding surface without anchoring structures, such as a conventional outsole with a flat surface produced by injection molding, is the bonding surface without anchoring structures. Based on the above, the number of these anchoring structures is set to 40 to 180 per square centimeter C, and the spacing G between adjacent anchoring structures is greater than or equal to 0.3 mm and less than or equal to 1.2 mm.

[0074] In one embodiment, the A / B ratio is greater than or equal to 1.2 and less than or equal to 3.0; preferably, the A / B ratio is greater than or equal to 1.5 and less than or equal to 2.0. To satisfy the foregoing conditions, the number and spacing of these anchoring structures of the present invention can be appropriately adjusted. For example, when the number of these anchoring structures is 50 to 170 per square centimeter, the spacing between adjacent anchoring structures is set to be greater than or equal to 0.3 mm and less than or equal to 1.0 mm; when the number of these anchoring structures is 80 to 120 per square centimeter, the spacing between adjacent anchoring structures is greater than or equal to 0.5 mm and less than or equal to 1.0 mm.

[0075] like Figure 7 As shown, the specific forms of these anchoring structures in this embodiment are protrusions 13, each protrusion 13 being arranged along a first direction D1, which is perpendicular to the bonding surface 12 of the outsole 10. Each protrusion 13 in this embodiment has a root 13a and a top 13b. The root 13a is integrally connected to the bonding surface 12, and the height H of each protrusion 13 from the root 13a to the top 13b is greater than or equal to 0.3 mm and less than or equal to 1.2 mm. In this embodiment, the number of protrusions 13 is 90 per square centimeter, the spacing G between adjacent protrusions 13 is 0.6 mm, and the height H of each protrusion 13 is 0.7 mm. Therefore, by providing multiple protrusions 13 on the bonding surface 12, the outsole 10 achieves the purpose of increasing the surface area. Compared with the flat surface of a traditional outsole, the A / B ratio of this embodiment is greater than or equal to 1.5 and less than or equal to 2.0.

[0076] The outsole 10 in the above embodiment is manufactured by injection molding, and the injection molding material used can be a thermoplastic material or a thermosetting material. The thermoplastic material is selected from one or more combinations of thermoplastic polyurethane (TPU), polyamide, polyester, and ionomer; the thermosetting material can be selected from one or more combinations of epoxy resin, thermosetting polyurethane, and rubber. In this embodiment, the injection molding material is an example of a thermoplastic material that is easy to recycle. Furthermore, regardless of whether a thermoplastic or thermosetting material is chosen to manufacture the outsole 10, other materials can be incorporated during the process, such as one or more combinations of carbon fiber, glass fiber, and natural fibers.

[0077] Combined with, for example Figure 8As shown, in this embodiment, the mold 200 used to manufacture the outsole 10 has a plurality of recesses 202 pre-formed at a predetermined location in one of its cavity 201. These recesses 202 are used to form the protrusions 13. The number of these recesses 202 is set to be between 40 and 180 per square centimeter. Taking the above-mentioned number of protrusions 13 as 90 per square centimeter as an example, the number of these recesses 202 is also 90. In other words, the specific number of recesses 202 is equivalent to the number of protrusions 13 formed, the spacing between adjacent recesses 202 is equivalent to the spacing between adjacent protrusions 13 formed, and the depth of the recesses 202 is equivalent to the height of the protrusions 13 formed. Furthermore, it is worth mentioning that the aforementioned recesses 202 can be distributed throughout one side of the mold cavity 201 or arranged locally. The spacing and depth of the recesses 202 are not limited to equal spacing or the same depth, but depend on the actual product requirements. For example, the depth of the recesses 202 near the periphery of the outsole 10 can be greater than the depth of the recesses 202 located in the middle of the outsole 10.

[0078] The aforementioned recesses 202 are directly machined onto the upper mold 203 or lower mold 204 of the mold 200 using electrical discharge machining (EDM) or computer numerical control (CNC) machining programs. Alternatively, the mold can be a 3D metal-printed mold, and these recesses are pre-formed voids created during the 3D metal printing process. Therefore, when the cavity 201 and these recesses 202 are filled with injection molding material, and the molded product is removed after cooling, it is considered a molded product. Figures 4 to 6 The outsole 10 shown has multiple protrusions 13. It should also be noted that although the aforementioned outsole 10 is manufactured using a mold, it is possible that the outsole 10 with multiple protrusions 13 could also be directly manufactured using 3D printing. In this case, the outsole 10 is not a molded product, but a 3D printed structure. It is worth noting that regardless of whether these protrusions 13 of the outsole 10 are molded or 3D printed, these protrusions 13 differ from the rough surface created by roughening traditional outsoles.

[0079] The midsole 20 of the shoe component 100 is formed by physical foaming using a supercritical fluid, and the midsole 20 has a foam density between 0.1 and 0.3 g / cm³. 3 The structure, such as Figure 2 and Figure 3As shown, the midsole 20 has a bonding surface 21, which bonds the bonded surface 12 and the protrusions 13 of the outsole 10. More specifically, the bonding surface 21 bonds the bonded surface 12 and the protrusions 13 in a covering manner. Because the contact surface area between the bonding surface 21 and the bonded surface 12 and the protrusions 13 is increased, the adhesive force between the midsole 20 and the outsole 10 after they are bonded together can reach greater than or equal to 3 kg, thereby ensuring the stability of the bond and improving wearing safety. In this embodiment, the midsole 20 is made by mixing a thermoplastic material and a foaming agent, wherein the weight percentage of the thermoplastic material is between 90wt% and 99wt%, and the weight percentage of the foaming agent is between 1wt% and 10wt%. The thermoplastic material is selected from one or more of the group consisting of thermoplastic polyurethane, polyamide, polyester and ion exchange resin, and the foaming agent is selected from one or more of the group consisting of mineral fiber, calcium carbonate, silica, talc and sodium bicarbonate.

[0080] The above is a structural description of the shoe component 100. The following is a further explanation... Figure 9 As shown, the method for preparing the shoe component 100 includes the following steps.

[0081] Step S1: Prepare the outsole 10. As mentioned above, the outsole 10 can be made by molding or by 3D printing. The number of protrusions 13 on the bonding surface 12 of the outsole 10 is between 40 and 180 per square centimeter. In this embodiment, the outsole 10 is made by molding 200, and the number of protrusions 13 per square centimeter is 90.

[0082] Step S2: Open the mold 200, remove the outsole 10, and place the outsole 10 into a cavity 301 of another mold 300, as shown. Figure 10 As shown, the remaining space of the cavity 301 after deducting the space occupied by the base 10 constitutes a foaming space S.

[0083] Step S3: Control the gas pressure inside the mold 300 to be greater than or equal to 5 bar and less than or equal to 50 bar. In this embodiment, the gas pressure is set to be greater than or equal to 5 bar and less than or equal to 20 bar.

[0084] Step S4: Inject a thermoplastic foaming fluid material into the foaming space S of the mold 300. The thermoplastic foaming fluid material includes the aforementioned thermoplastic material, foaming agent, and a supercritical fluid, which includes nitrogen or carbon dioxide. The injected thermoplastic foaming fluid material occupies approximately 10% to 50% of the volume of the foaming space S. The thermoplastic foaming fluid material remains in an unfoamed state due to the preset gas pressure within the foaming space S.

[0085] Step S5: Release the gas pressure inside the mold 300, causing the thermoplastic foaming fluid material to foam and fill the foaming space S. The thermoplastic foaming fluid material also fills the gaps between the protrusions 13 of the outsole 10. Simultaneously, the supercritical fluid generates numerous microbubbles in the foamed structure due to gas-phase separation. The above describes the physical foaming injection molding technology. The resulting molded product is the physically foamed insole 20. The structural relationship between the insole 20 and the outsole 10 is as described above and will not be repeated.

[0086] Step S6: Open the mold 300 and take out the following... Figure 1 and Figure 2 The shoe component 100 shown includes the outsole 10 and the midsole 20.

[0087] The above-mentioned preparation method adopts physical foaming injection molding technology. After the outsole 10 and the midsole 20 are made in a co-mold manner, the ratio of the volume of the midsole 20 to the volume of the foaming space S of the mold 300 is between 1:0.98 and 1:1.02, which is close to 1:1. Therefore, the midsole 20 does not need to undergo much subsequent processing, nor does it need to use adhesives for bottoming. Therefore, the above-mentioned preparation method can improve process efficiency and save process costs by omitting the surface roughening, gluing and bottoming processes of the outsole or midsole, and can also reduce waste generation.

[0088] In steps S1 and S2 above, the outsole 10 is first removed by opening the mold, and then the outsole 10 is moved to another mold 300 to continue the co-mold processing procedure. However, it should be noted that, in addition to the above method, the mold structure can also be slightly adjusted. That is, after the upper mold 203 of the mold 200 is opened, the outsole 10 is kept in the lower mold 204, and then the lower mold 204 together with the formed outsole 10 is directly moved to the mold 300 to continue the co-mold processing procedure.

[0089] The aforementioned co-molded shoe component 100 is exemplified by including the outsole 10 and the midsole 20. However, it should be noted that in other co-molding processes, when the outsole 10 is placed into the mold cavity 301 of the mold 300, a woven upper 30 can be pre-fitted onto a last 400, such as... Figure 11 As shown, the last 400 and the upper 30 are placed together in the mold 300, and a foaming space S1 is reserved between the bottom of the upper 30 and the outsole 10. The foaming space S1 is used to inject the thermoplastic foamed fluid material into it and form the midsole 20. The shoe component 100A finally obtained by co-molding includes the outsole 10, the midsole 20 and the upper 30, as shown. Figure 12 As shown, the bottom fabric surface 31 of the upper 30 is co-molded with the top surface 22 of the midsole 20, and the top surface 22 and the bonding surface 21 are arranged opposite to each other. The upper 30 has a porous woven structure, thus creating an anchoring effect at the bonding point with the midsole 20, thereby strengthening their bond. The bonding surface 21 of the midsole 20 remains integrated with the bonding surface 12 and the protrusions 13 of the outsole 10. This also improves process efficiency.

[0090] In the above embodiments, the protrusions 13 are generally of equal diameter, but those that meet the following conditions are not considered: the A / B ratio is greater than 1, the number of anchoring structures is 40 to 180 per square centimeter C, and the spacing G between adjacent anchoring structures is greater than or equal to 0.3 mm and less than or equal to 1.2 mm. Figure 7 The protrusion 13 shown is the only example. Other equivalent forms of the anchoring structure of the present invention under the aforementioned conditions will be illustrated below.

[0091] Figure 13 The anchoring structure shown is a protrusion 13A arranged along the first direction D1. Unlike the protrusion 13 in the previous embodiment, the top width W1 of the protrusion 13A in this embodiment is less than or equal to the root width W2. This structural form helps to strengthen the connection between the protrusion 13A and the mating surface 12, with the top width W1 being less than the root width W2 being preferable. The aforementioned protrusion 13A can be manufactured by a recess in a mold or by 3D printing.

[0092] Figure 14 The anchoring structure shown also consists of a protrusion 13B arranged along the first direction D1. Unlike the protrusions 13 and 13A mentioned above, the top width W3 of the protrusion 13B in this embodiment is greater than the root width W4. This structural form is intended to strengthen the adhesion between the midsole 20 and the outsole 10. The aforementioned protrusion 13B can also be manufactured using a mold recess or 3D printing. When manufactured using a mold, although the top-wide and bottom-narrow structure of the protrusion 13B may increase the difficulty of demolding, the outsole 10 has elastic material properties and can deform moderately during demolding. As long as the top width W3 does not excessively exceed the root width W4, it is still feasible.

[0093] As can be seen from the above, when the anchoring structure of the outsole 10 of the present invention exists in a raised form and is co-molded with the midsole 20 through physical foam injection molding technology, it does indeed ensure and strengthen the necessary adhesion between them by increasing the contact surface area between them. Furthermore, in Figure 13 and Figure 14 Under the guidance of the disclosed structure, the protrusion can also be further made so that the top and the root are the same width, but the middle part of the protrusion is greater than or less than the width of its top (not shown), so as to achieve the same effect.

[0094] The anchoring structures described above all use a protrusion as an example, but in reality, there can be other equivalent forms. For example... Figure 15 As shown, the anchoring structure is a recess 14 formed by recessing from the mating surface 12. The depth of the recess 14 is greater than or equal to 0.3 mm and less than or equal to 1.2 mm. The recess 14 can be made by using a pre-set protrusion (not shown) in the mold cavity or by 3D printing. In the co-molding process, when the thermoplastic foamed fluid material foams in the mold, some of the material will enter each recess 14. Finally, the midsole 20 obtained by co-molding will partially fill each recess 14 in the form of anchor insertion holes. That is, a part of the mating surface 21 of the midsole 20 will fill these recesses 14.

[0095] Figure 16 The anchoring structure shown is a through hole 15 that penetrates the bottom surface 11 and the mating surface 12 of the outsole 10. The through hole 15 can be made by using a pre-set protrusion (not shown) in the mold cavity or by 3D printing. Similarly, in the co-molding process, a portion of the thermoplastic foamed fluid material is introduced into each through hole 15, so that a portion of the mating surface 21 of the midsole 20 is filled with these through holes 15.

[0096] Figure 17 The anchor structure shown is still a through hole 16, and... Figure 16 The difference between the through hole 15 and the through hole 16 shown is that the through hole 16 has an upper opening 16a connected to the mating surface 12, and a lower opening 16b connected to the bottom surface 11, wherein the diameter of the upper opening 16a is smaller than or equal to the diameter of the lower opening 16b. In this embodiment, the through hole 16 is a tapered hole with the upper opening 16a having a smaller diameter than the lower opening 16b. Ultimately, because a portion of the co-molded midsole 20 will fill these through holes 16, and because the through holes 16 have a structure that is narrower at the top and wider at the bottom, the anchoring effect between the midsole 20 and the outsole 10 is enhanced.

[0097] As can be seen from the above, when the anchoring structure of the present invention takes the recess 14, the through hole 15 or the through hole 16 as examples, the total surface area A of the inner hole wall and the surface area of ​​the joined surface 12 is still greater than the hypothetical surface area B. Therefore, when the outsole 10 and the insole 20 are joined together by the co-molding process, the outsole 10 and the insole 20 achieve an adhesion force greater than or equal to 3 kg due to the increased contact surface area.

[0098] The above-described outsole 10 with bonding surface 12 is based on a flat surface. However, in practice, the outsole may have an upward-facing sidewall around its perimeter to increase the coverage when bonding with the midsole. Figure 18 and Figure 19 In the illustrated embodiment, the outsole 40 includes a main body 41 and a sidewall 42 disposed along the periphery of the main body 41 and facing upwards. The portion of the outsole 40 with its mating surface 43 corresponding to the main body 41 is defined as a first region A1, and the portion of the mating surface 43 corresponding to the sidewall 42 is defined as a second region A2. The anchoring structure of this embodiment is based on... Figure 8 Taking the protrusions 13 shown as an example, these protrusions 13 are distributed in the first region A1 and the second region A2, and the number, spacing and height in each region are the same as required by the present invention. The midsole 20, which is made by co-molding, maintains a larger contact surface area with the outsole 40, and the midsole 20 is also locally covered by the sidewall 42 to enhance the stability of the bond.

[0099] Furthermore, based on the fact that the base 40 is composed of the main body 41 and the sidewall 42, the anchoring structure can have other variations besides the aforementioned equal diameter and equal height type, for example... Figure 20 As shown, the root width of the protrusion 13 located in the first area A1 is smaller than the root width of the protrusion 13C located in the second area A2. Based on this, the top width of the protrusion 13 can be greater than, equal to, or less than its root width, while the top width of the protrusion 13C is preferably equal to or less than its root width. Furthermore, the purpose of the aforementioned differences is to improve the firmness of these protrusions 13C integrally connected to the inclined surface of the side wall 42. Moreover, the aforementioned protrusions 13 and 13C are all arranged along the first direction D1 to facilitate the demolding operation of the bottom.

[0100] Furthermore, when the outsole is manufactured using 3D printing, the direction of the protrusions can be controlled, such as... Figure 21As shown, the protrusion 13 located in the first region A1 is positioned along the first direction D1, and the protrusion 13D located in the second region A2 is positioned along a second direction D2, which is not parallel to the first direction D1. Based on the fact that the second direction D2 is not parallel to the first direction D1, the protrusion 13D can be horizontal, obliquely upward, or even obliquely downward, thereby allowing the midsole 20 subsequently manufactured using co-molding to more firmly bond with the outsole.

[0101] Furthermore, it is worth mentioning that the various forms of the anchoring structure described above, whether protrusions, recesses, or through holes, can have rough surfaces, thereby enhancing adhesion to the co-molded midsole 20. Additionally, the anchoring structure described above is exemplified by its placement on the outsole; however, it is not limited to this. The anchoring structure can also be placed on other shoe components besides the outsole, such as the midsole overlay, as long as the shoe component can be co-molded with the physically foamed midsole through the anchoring structure, which constitutes an equivalent variation of the present invention. Finally, it should be emphasized that the dimensions, proportions, and distribution of the anchoring structures in the accompanying drawings of the above embodiments are drawn for ease of understanding and explanation; that is, they are not drawn according to the dimensions, proportions, and distribution of the actual product. Therefore, the dimensions, proportions, and distribution of the anchoring structures presented in the figures should not be taken as limitations in interpretation.

[0102] The above description is only a preferred embodiment of the present invention. Any equivalent changes made by applying the scope of the present invention and the claims should be included within the protection scope of the present invention.

[0103] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A common-mold shoe component, comprising: A base includes a mating surface and multiple anchoring structures located on the mating surface. The total surface area of ​​the anchoring structures and the mating surface is A. The ratio of the surface area A to the surface area B of an imaginary mating surface that does not have anchoring structures is greater than 1. A midsole, formed by physical foaming with a supercritical fluid, includes a bonding surface that bonds the bonded surface to the anchoring structures.

2. The co-molding shoe component according to claim 1, wherein, The ratio of A to B is greater than or equal to 1.2 and less than or equal to 3.

0.

3. The co-molding shoe component according to claim 1, wherein, The ratio of A to B is greater than or equal to 1.5 and less than or equal to 2.

0.

4. The co-molded shoe component according to any one of claims 1 to 3, wherein, The number of these anchoring structures ranges from 40 to 180 per square centimeter, and the spacing between adjacent anchoring structures is greater than or equal to 0.3 mm and less than or equal to 1.2 mm.

5. The co-molding shoe component according to claim 4, wherein, These anchoring structures are each a protrusion, each protrusion having a root and a top, the root connecting to the mating surface, and the height of each protrusion from the root to the top being greater than or equal to 0.3 mm and less than or equal to 1.2 mm; the mating surface of the midsole covers the mating surface and these anchoring structures.

6. The co-molding shoe component according to claim 5, wherein, These protrusions are positioned along a first direction, which is perpendicular to the mating surface of the outsole.

7. The co-molding shoe component according to claim 6, wherein, The width of the top of each protrusion is greater than the width of the root.

8. The co-molding shoe component according to claim 6, wherein, The width of the top of each protrusion is less than or equal to the width of the root.

9. The co-molding shoe component according to claim 6, wherein, The top width of each protrusion is equal to the root width, and the middle part of each protrusion is either greater than or less than the top width.

10. The co-molding shoe component according to claim 5, wherein, The outsole includes a main body and a side wall disposed upward along the periphery of the main body. The portion of the surface to which the main body is joined is defined as a first region, and the portion of the surface to which the side wall is joined is defined as a second region. The root width of the protrusion in the first region is smaller than the root width of the protrusion in the second region.

11. The co-molding shoe component according to claim 10, wherein, The protrusions in the first region are arranged along a first direction, and the protrusions in the second region are arranged along a second direction; wherein the first direction is perpendicular to the mating surface of the outsole, and the second direction is not parallel to the first direction.

12. The co-molding shoe component according to claim 11, wherein, The base is a 3D printed structure.

13. The co-molded shoe component according to any one of claims 1 to 3, wherein, The base is a 3D printed structure.

14. The co-molding shoe component according to claim 4, wherein, The outsole has a bottom surface that is disposed opposite to the mating surface; each of the anchoring structures is a through hole that penetrates both the mating surface and the bottom surface of the outsole; a portion of the mating surface of the midsole fills these through holes.

15. The co-molded shoe component according to claim 14, wherein, Each through hole has an upper opening connected to the mating surface, and each through hole has a lower opening connected to the bottom surface, wherein the diameter of the upper opening is less than or equal to the diameter of the lower opening.

16. The co-molding shoe component according to claim 4, wherein, These anchoring structures are recesses, each recess being formed by recessing from the mating surface; a portion of the mating surface of the midsole fills these recesses.

17. The co-molded shoe component according to claim 1, comprising an upper, the upper being co-molded with a top surface of the midsole, the top surface being disposed opposite to the bonding surface.

18. A method for preparing a co-molded shoe component, comprising the following steps: Prepare a large outsole having a bonding surface and a plurality of anchoring structures located on the bonding surface, wherein the number of these anchoring structures is 40 to 180 per square centimeter. The outsole is moved into a mold, and a foaming space is reserved in the mold; The gas pressure inside the mold is controlled to be greater than or equal to 5 bar and less than or equal to 50 bar. A thermoplastic foaming fluid material is injected into the foaming space of the mold, the thermoplastic foaming fluid material comprising a supercritical fluid; The gas pressure inside the mold is released, and the thermoplastic foaming fluid material is foamed to form a physically foamed midsole, which has a bonding surface that bonds the bonding surface of the outsole to these anchoring structures. Open the mold and remove a shoe component containing the outsole and the midsole.

19. The method for preparing a co-molded shoe component according to claim 18, wherein, The steps used to prepare this outsole include: A mold is provided, wherein a plurality of recesses are pre-formed in a cavity, the number of which is 40 to 180 per square centimeter; A thermoplastic material is injected into the mold, filling the cavity and recesses, and then cooled to form the base.

20. The method for preparing a co-molded shoe component according to claim 19, wherein, This mold is a 3D metal printing mold, and these recesses are reserved structures in the 3D metal printing process.

21. The method for preparing a co-molded shoe component according to claim 19, wherein, These recesses in the mold are created by electrical discharge machining or computer numerical control machining programs.

22. The method for preparing a co-molded shoe component according to claim 18, comprising placing an upper into the mold while the outsole is being moved into the mold; wherein when the thermoplastic foamed fluid material is used to foam and form the physically foamed midsole, a top surface of the midsole is bonded to the upper, and the top surface and the bonding surface are arranged opposite to each other.

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