Rubber mold with single sprue

Abstract

The utility model provides a rubber mold with a single sprue. The rubber mold comprises an upper mold plate, an upper mold, a boot core mold and a lower mold, a cavity is formed in the upper mold in an up-down penetrating manner, and the boot core mold is arranged in the cavity; the boot core mold is arranged on the upper side of the upper mold, the lower mold is arranged on the lower side of the upper mold, a forming cavity for forming the rubber boot is formed among the upper mold, the boot core mold and the lower mold, and a runner is arranged in the middle of the upper mold, located on the side edge of the forming cavity and used for being communicated with the forming cavity; when the lower mold and the upper mold are closed, a rubber material enters the forming cavity from the runner to form a rubber boot with a boot body and a boot sole; and when the lower die and the upper die are closed, a rubber material enters the forming cavity from the runner, is extruded to the forming cavity of the upper die and the forming cavity of the lower die, and is vulcanized to form the rubber boot. The rubber mold with the single pouring gate has the advantages that the working procedures for producing rubber boots by the mold are few, the technical requirement on labor force is low, the requirement on people is low, the comprehensive cost is low, and the productivity is higher.

Description

Technical Field

[0001] This utility model relates to the field of rubber mold technology with a single gate, and more particularly to a rubber mold with a single gate. Background Technology

[0002] Rubber boots are shoes with a slightly cylindrical upper that extends above the ankle bone, and typically consist of a boot body, a sole, and a lining.

[0003] Currently, traditional rubber boots are a product of a labor-intensive production method. On a simple production line, workers manually glue the various parts of the rubber boot, such as the rubber sheet, lining, and sole, onto the shoe last to form a rubber boot. The boot is then vulcanized in a vulcanizing tank to form the final product.

[0004] Existing patent publication number CN119058141A discloses an integrated molding compound rubber boot mold and its production method. This application discloses an integrated molding compound rubber boot mold and its production method, relating to the field of mold technology. The mold includes an upper mold, an upper core mold, a lower core mold, and a lower mold. The upper mold has a cavity extending vertically through it. The upper core mold is located at the top of the cavity, and the lower core mold is movably located at the bottom of the cavity. The lower mold is movably located below the upper mold. A molding cavity for molding the boot body is formed between the upper mold, upper core mold, lower core mold, and lower mold, and a flow channel for connecting the molding cavity is formed on the upper core mold. The mold production method includes a material feeding step, a mold closing step, an injection molding step, a vulcanization step, and a demolding step. This mold can eliminate defects such as parting lines and flash on the outer side of the boot body, making the outer side of the boot body more aesthetically pleasing and improving its sales grade. This mold production method has fewer steps, high product molding quality, low labor requirements, is safe and environmentally friendly, and has low overall cost.

[0005] However, the existing rubber boot production molds still have the following defects: 1. The added annular cavity makes the upper edge of the inner side of the boot uniformly form flash, but it cannot directly achieve the effect of no flash. It is still a structure designed to facilitate the elimination of flash. Doing so wastes rubber material, and if the vacuum is not sufficient, the rubber material in the annular cavity will also have defects. It has high requirements for the mold and the actual cost is not low.

[0006] 2. To simplify the runner structure, the runner is arranged sequentially along the inside of the upper core mold, the inside of the lower core mold, and the lower surface of the lower core mold. After injection molding, the injection waste in the runner on the lower surface of the lower core mold contacts the lower edge of the inner side of the boot body (i.e., the boot sole). The injection waste or excess rubber formed when injection stops forms at the edge of the boot sole. Although it does not form flash on the outside of the boot body, which is not aesthetically pleasing, the injection-molded rubber boot still needs to undergo secondary processing on the outer surface. It is not a directly molded product. Furthermore, the waste or excess rubber on the boot sole needs to be separated manually with the help of machines, making the process quite cumbersome and complicated.

[0007] Therefore, how to improve existing rubber shoe production molds to overcome the above-mentioned shortcomings is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0008] The purpose of this utility model is to address the aforementioned problems and deficiencies by providing a single-gate rubber mold with high production efficiency and low cost.

[0009] The technical solution of this utility model is implemented as follows: A single-gate rubber mold includes an upper mold plate, an upper mold, a boot core mold, and a lower mold; the upper mold has a cavity extending through its upper and lower parts, and the boot core mold is disposed within the cavity; the lower mold is disposed below the upper mold, and a molding cavity for molding rubber boots is formed between the upper mold, the boot core mold, and the lower mold; a flow channel is provided in the middle of the upper mold, and the flow channel is located on the side of the molding cavity, and the flow channel is used to connect the molding cavity; when the lower mold and the upper mold are closed, the rubber material enters the molding cavity through the flow channel to form a rubber boot with a boot body and a boot sole.

[0010] Furthermore, the flow channel is used to connect the molding cavity inlet on the side of the upper mold. When the lower mold and the upper mold are closed, the rubber material enters the molding cavity through the flow channel, is squeezed into the molding cavity around the upper mold, and forms the boot sole first and then the boot body from top to bottom.

[0011] Furthermore, the flow channel is used to connect the molding cavity inlet on the side of the lower mold. When the lower mold and the upper mold are closed, the rubber material enters the molding cavity through the flow channel and is squeezed into the molding cavity around the boot core mold. From bottom to top, the boot sole is formed first and then the boot body is formed.

[0012] Furthermore, at least two sets of the boot core molds are located within the cavity, and the flow channel is located between the molding cavities formed by the two sets of boot core molds.

[0013] Furthermore, the mating surface of the upper mold and the lower mold is located at the junction of the boot body and the sole of the lower mold.

[0014] Furthermore, the mold contains at least one set of vacuum channels, which are configured to activate when the adhesive enters the molding cavity from the flow channel to extract air from the middle of the mold.

[0015] Furthermore, the boot core mold has at least two sets of air blowing channels inside, which are configured to activate when the rubber boot is removed, and blow the rubber boot off with gas after the mold is opened.

[0016] Furthermore, the air blowing channel includes an air blowing inlet, which is located on the upper template and connected to the injection molding device, and the injection molding device provides the source gas.

[0017] Furthermore, the air blowing channel also includes an air blowing valve. After the gas enters the air blowing channel, it blows the air blowing valve to blow off the rubber boot.

[0018] Furthermore, the blowing valve includes a forefoot blowing valve, a heel blowing valve, and an inlet blowing valve. The forefoot blowing valve is located at the front of the lower mold, the heel blowing valve is located at the rear of the lower mold, and the inlet blowing valve is located at the upper part of the boot core mold.

[0019] Furthermore, it also includes a middle plate, which is disposed between the upper die and the lower die, and the middle plate and the lower die form an extrusion cavity.

[0020] Furthermore, the extrusion cavity is filled with rubber material in advance. When the lower mold, the middle plate and the upper mold are closed, the rubber material enters the molding cavity through the flow channel and is squeezed into the molding cavity around the boot core mold to form the boot body; the rubber material entering the extrusion cavity is squeezed to form the boot sole.

[0021] This invention redefines single-gate rubber molds, reducing production costs and increasing production efficiency. Compared to existing designs, it eliminates the need for upper and lower core molds, using a single integral boot core mold and a single molding cavity to injection mold rubber boots. Alternatively, to achieve two-tone rubber boots, a middle plate can be added to isolate the molding cavity of the upper mold from the extrusion cavity of the lower mold, allowing the boot body to be formed by injection molding and the sole by extrusion molding. Different colored rubber materials can be added to create two-tone rubber boots. The invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0023] Figure 1 This is a cross-sectional view of a single-gate rubber mold according to an embodiment of the present invention.

[0024] Figure 2 Another cross-sectional view of a single-gate rubber mold according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of a single-gate rubber mold according to an embodiment of the present invention;

[0026] Figure 4 This is another structural schematic diagram of a single-gate rubber mold according to an embodiment of the present invention;

[0027] Figure 5 This is an exploded view of a single-gate rubber mold before mold closing, according to an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of the mold closing of a single-gate rubber mold according to an embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of another mold closing mechanism for a single-gate rubber mold according to an embodiment of the present invention.

[0030] Figure 8 Another cross-sectional view of a single-gate rubber mold according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the mold opening of a single-gate rubber mold according to an embodiment of the present invention.

[0032] Figure 10 This is a schematic diagram of the vulcanization state of a single-gate rubber mold according to an embodiment of the present invention.

[0033] Figure 11 This is a schematic diagram of the ejection of a boot core mold of a single-gate rubber mold according to an embodiment of the present invention.

[0034] Figure 12 This is a schematic diagram of the blow-off of a rubber boot made from a single-gate rubber mold according to an embodiment of the present invention.

[0035] List of reference numerals in the attached diagram:

[0036] 1. Upper template; 2. Upper mold; 3. Lower mold; 4. Boot core mold; 5. Middle plate; 6. Rubber boot; 100. Runner; 101. Molding cavity inlet; 102. Molding cavity; 103. Runner inlet; 104. Extrusion cavity; 200. Air blowing channel; 201. Air blowing inlet; 202. Forefoot air blowing valve; 203. Heel air blowing valve; 204. Inlet air blowing valve; 300. Vacuum channel. Detailed Implementation

[0037] 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.

[0038] 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; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown in Embodiment 1: This utility model is a single-gate rubber mold, including an upper mold plate 1, an upper mold 2, a boot core mold 4, and a lower mold 3; the upper mold 2 has a cavity extending through its upper and lower parts, and the boot core mold 4 is disposed in the cavity; the lower mold 3 is disposed on the lower side of the upper mold 2, and a molding cavity 102 for molding the boot body is formed between the upper mold 2, the boot core mold 4, and the lower mold 3. A flow channel 100 is provided in the middle of the upper mold 2, and the flow channel 100 is located on the side of the molding cavity 102. The flow channel 100 is used to connect the molding cavity 102 outside the boot core mold 4; when the lower mold 4 and the upper mold 2 are closed, the rubber material enters the molding cavity 102 outside the boot core mold 4 through the flow channel 100, is squeezed up to the molding cavity 102 of the upper mold 2, and down to the molding cavity 102 of the lower mold 3, and forms a rubber boot 6 through vulcanization.

[0040] The flow channel 100 is used to connect the molding cavity inlet 101. When the lower mold 3 and the upper mold 2 are closed, the rubber material enters the molding cavity 102 between the lower mold 3 and the boot core mold 4 through the flow channel 100 to form the boot sole. It is then squeezed into the molding cavity 102 between the upper mold 2 and the boot core mold 4 to form the boot body. Finally, it is heated and vulcanized to form the rubber boot 6.

[0041] The flow channel 100 is used to connect the molding cavity inlet 101. When the lower mold 3 and the upper mold 2 are closed, the rubber material enters the molding cavity 102 between the upper mold 2 and the boot core mold 4 through the flow channel 100 to form the boot body. It is squeezed into the molding cavity 102 between the lower mold 3 and the boot core mold 4 to form the boot sole. Finally, it is heated and vulcanized to form the rubber boot 6.

[0042] At least two sets of the boot core mold 4 are located in the cavity, and the flow channel 100 is located between the molding cavity 102 formed by the two sets of boot core molds 4. The molding cavity 102 has a molding cavity inlet 101, and the flow channel 100 is connected to the molding cavity 102 through the molding cavity inlet 101.

[0043] The mating surface of the upper mold 2 and the lower mold 3 is located at the junction of the boot body and the boot sole inside the lower mold 3.

[0044] The mold contains at least one set of vacuum channels 300. These vacuum channels 300 are configured to activate when the adhesive enters the molding cavity 102 of the boot core mold 4 through the flow channel 100, thereby removing air from the center of the mold. Alternatively, the air can be removed from the mold through the vacuum channels 300 after mold closing, or the adhesive can be injected while vacuuming is in progress.

[0045] The boot core mold 4 has at least two sets of air blowing channels 200 inside. The air blowing channels 200 are set to be activated when the rubber boot 6 is removed, and the rubber boot 6 is blown off by gas after the mold is opened.

[0046] The air blowing channel 200 includes an air blowing inlet 201, which is located on the upper template 1 and connected to the injection molding device, which provides the source gas.

[0047] The air blowing channel 200 also includes air blowing valves, which include a forefoot air blowing valve 202, a heel air blowing valve 203, and an inlet air blowing valve 204. The forefoot air blowing valve 202 is located at the front of the lower mold 4, the heel air blowing valve 203 is located at the rear of the lower mold 4, and the inlet air blowing valve 204 is located at the upper part of the boot core mold 4. After the gas enters the air blowing channel 200, it first blows open the inlet air blowing valve 204. After the gas blows open the forefoot air blowing valve 202 and the heel air blowing valve 203, it blows the rubber boot 6 off.

[0048] The method for producing rubber boots using a rubber boot mold includes the following steps:

[0049] Mold closing steps: The upper mold plate 1 covers the upper mold 2, and the lower mold 3 is controlled to move upward until it is below the upper mold 2, until the mold closing is completed (e.g., Figure 3 or Figure 4 (as shown);

[0050] Injection molding steps: First, vacuum the molding cavity 102, then inject rubber material into the molding cavity 102 through the flow channel 100 to form the boot body and boot sole, and then form the rubber boot 6 by heating and vulcanization; the boot body and boot sole are made of the same material and are integrally injection molded.

[0051] The detachment process is as follows: First, drive the lower mold 3 to move downwards and eject the boot core mold 4. After the lower mold 3 separates from the upper mold 2 and the boot core mold 4, and the lower mold 3 separates from the upper mold 2, blow air into the air channel 200 in the boot core mold 4 through the air inlet 201 to blow the air valve and make the rubber boot 6 detach. If the air pressure is insufficient, manual assistance can be used.

[0052] In traditional production methods (where rubber sheets are bonded separately and then vulcanized), rubbers with poor self-adhesion (such as EPDM, butyl rubber, chlorosulfonated polyethylene, and silicone rubber) cannot be used because they are prone to cracking and other defects later on. However, the production method described in this application eliminates the need for bonding between rubber sheets by using a high-pressure extrusion molding machine to form a single piece. This allows for a wider range of rubber materials to be used (such as EPDM, butyl rubber, chlorosulfonated polyethylene, and silicone rubber), thus enabling the shoes to have more functions, such as impact resistance, puncture resistance, flame retardancy, high-temperature resistance, resistance to various chemical media, protection against various radiations, insulation, conductivity, antistatic properties, and ozone resistance.

[0053] In addition, the boot body and sole can be made in various colors and vulcanized into two-tone rubber boots. These can then be paired with socks of various colors and patterns, greatly enriching the styles and patterns of boots and shoes. Therefore, the finished rubber boots formed by the boot body and sole still need to be sanded before they can be colored. We can completely eliminate the need for the process of removing the burrs inside the rubber boots and directly sand the burrs and color them at the same time, saving a lot of steps compared to the existing design.

[0054] Based on the need for vulcanizing rubber boots into two colors, such as Figures 5-12 As shown in Embodiment 2, this utility model is a single-gate rubber mold, including an upper mold plate 1, an upper mold 2, a boot core mold 4, a middle plate 5, and a lower mold 3; the upper mold 2 has a cavity extending through its upper and lower parts, and the boot core mold 4 is disposed within the cavity; the lower mold 3 is disposed below the upper mold 2, and a molding cavity 102 for molding rubber boots is formed between the upper mold 2, the boot core mold 4, and the lower mold 3; a flow channel 100 is provided in the middle of the upper mold 2, and the flow channel 100 is located on the side of the molding cavity 102, the flow channel 100 being used for... The molding cavity 102 is connected; the middle plate 5 is disposed between the upper mold 2 and the lower mold 3, and the middle plate 5 and the lower mold 3 form an extrusion cavity 104; the extrusion cavity 104 is filled with rubber material in advance, and when the lower mold 3, the middle plate 5 and the upper mold 2 are closed, the rubber material enters the molding cavity 102 through the flow channel 100. The molding cavity 102 is about 0.3mm-0.3cm wide and is squeezed to the molding cavity 102 around the boot core mold 4 to form the boot body; the rubber material entering the extrusion cavity 104 is squeezed to form the boot sole.

[0055] The flow channel 100 is used to connect to the inlet of the molding cavity 102 on the side of the upper mold 2. When the lower mold 3 and the upper mold 2 are closed, the rubber material enters the molding cavity 102 through the flow channel 100, is squeezed into the molding cavity 102 around the upper mold 2, and forms the boot body from top to bottom.

[0056] The flow channel 100 is used to connect the inlet of the molding cavity 102 on the side of the lower mold 3. When the lower mold 3 and the upper mold 2 are closed, the rubber material enters the molding cavity 102 through the flow channel 100, is squeezed into the molding cavity 102 around the boot core mold 4, and forms the boot body from bottom to top.

[0057] At least two sets of the boot core mold 4 are located in the cavity, and the flow channel 100 is located between the molding cavity 102 formed by the two sets of boot core molds 4.

[0058] The mating surfaces of the upper mold 2, the middle plate 5, and the lower mold 3 are located at the junction of the forming cavity 102 and the extrusion cavity 104.

[0059] The mold contains at least one set of vacuum channels 300, which are configured to be activated when the adhesive enters the molding cavity 102 from the flow channel 100 to extract air from the middle of the mold.

[0060] The boot core mold 4 has at least two sets of air blowing channels 200 inside. The air blowing channels 200 are set to be activated when the rubber boot 6 is removed, and the rubber boot 6 is blown off by gas after the mold is opened.

[0061] The blowing channel 200 includes a blowing inlet, which is located in the upper mold 2 and connected to the injection molding device, which provides the source gas.

[0062] The air blowing channel 200 also includes an air blowing valve. After the gas enters the air blowing channel 200, it blows the air blowing valve to blow off the rubber boot 6.

[0063] The air blowing valve includes a forefoot air blowing valve 202, a heel air blowing valve 203, and an inlet air blowing valve 204. The forefoot air blowing valve 202 is located at the front of the lower mold 3, the heel air blowing valve 203 is located at the rear of the lower mold 3, and the inlet air blowing valve 204 is located at the upper part of the boot core mold 4. The forefoot air blowing valve 202 and the heel air blowing valve 203 are used to prevent the rubber material from seeping in and the gas from being blown in.

[0064] The method for producing rubber boots using a rubber boot mold includes the following steps:

[0065] Mold closing steps: The injection control plate 5 moves to the middle between the upper mold 2 and the lower mold 3, which is also below the boot core mold 4; then the upper mold plate 1 covers the upper mold 2, and controls the upper mold 2 to move downwards, moving above the lower mold 3, completing the mold closing from top to bottom (e.g. Figure 5 or Figure 6 , Figure 7 (as shown);

[0066] Injection molding steps: First, evacuate the molding cavity 102, then inject the molding compound into the molding cavity 102 through the runner 100, and diffuse it from the molding cavity 102 towards the upper mold 2 or the lower mold 3 (e.g., Figure 8 As shown), the boot body is formed by injection molding; the extrusion cavity, pre-filled with rubber material, is extruded to form the boot sole after mold closing; the boot body and sole can be made of different materials and colors;

[0067] Vulcanization steps: Open the lower mold 3 and pull out the middle plate 5 (e.g.) Figure 9 As shown), then the upper mold 2 and the lower mold 3 are joined together (as shown). Figure 10 As shown), the boot body and sole are vulcanized by heating to form a rubber boot 6;

[0068] The detachment process is as follows: First, drive the lower mold 3 downward to eject the boot core mold 4. After the lower mold 3 separates from the upper mold 2 and the boot core mold 4, and after the lower mold 3 separates from the upper mold 2, blow air through the air inlet 201 into the air channel 200 in the boot core mold 4 to activate the air valve, causing the rubber boot 6 to detach (e.g., Figure 11 , Figure 12 (As shown), if the blowing pressure is insufficient, manual assistance can be used.

[0069] The injection unit can be a vertical injection molding machine, providing air and rubber to the mold, and can clamp the middle plate 5 so that the middle plate 5 can be removed; it can also clamp the upper mold plate 1, upper mold 2, and lower mold 3, providing power for mold opening and closing; and of course, it also provides power for ejecting the boot core mold 4.

[0070] 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 single-gate rubber mold, characterized in that, The system includes an upper mold, an upper die, a boot core mold, and a lower die. The upper die has a cavity extending through it, and the boot core mold is disposed within the cavity. The lower die is disposed below the upper die. A molding cavity for molding rubber boots is formed between the upper die, the boot core mold, and the lower die. A flow channel is provided in the middle of the upper die, and the flow channel is located on the side of the molding cavity and is used to connect the molding cavity. When the lower die and the upper die are closed, the rubber material enters the molding cavity through the flow channel to form a rubber boot with a boot body and a boot sole.

2. The single-gate rubber mold according to claim 1, characterized in that, The flow channel is used to connect the molding cavity inlet on the side of the upper mold. When the lower mold and the upper mold are closed, the rubber material enters the molding cavity through the flow channel, is squeezed into the molding cavity around the upper mold, and forms the boot sole first and then the boot body from top to bottom.

3. The single-gate rubber mold according to claim 1, characterized in that, The flow channel is used to connect the molding cavity inlet on the side of the lower mold. When the lower mold and the upper mold are closed, the rubber material enters the molding cavity through the flow channel and is squeezed into the molding cavity around the boot core mold. From bottom to top, the boot sole is formed first and then the boot body is formed.

4. The single-gate rubber mold according to claim 1 or 2, characterized in that, At least two sets of boot core molds are located inside the cavity, and the flow channel is located between the molding cavities formed by the two sets of boot core molds.

5. The single-gate rubber mold according to claim 4, characterized in that, The mating surface of the upper mold and the lower mold is located at the junction of the boot body and the sole of the lower mold.

6. The single-gate rubber mold according to claim 4, characterized in that, The mold contains at least one set of vacuum channels, which are configured to activate when the rubber material enters the molding cavity through the flow channel to extract air from the middle of the mold.

7. The single-gate rubber mold according to claim 4, characterized in that, The boot core mold has at least two sets of air blowing channels inside. The air blowing channels are set to activate when the rubber boot is removed, and the rubber boot is blown off by gas after the mold is opened.

8. The single-gate rubber mold according to claim 7, characterized in that, The air blowing channel includes an air blowing inlet, which is located on the upper template and connected to the injection molding device, which provides the source gas.

9. The single-gate rubber mold according to claim 8, characterized in that, The air blowing channel also includes an air blowing valve. After the gas enters the air blowing channel, it blows the air blowing valve and blows the rubber boot off.

10. The single-gate rubber mold according to claim 9, characterized in that, The air valve includes a forefoot air valve, a heel air valve, and an inlet air valve. The forefoot air valve is located at the front of the lower mold, the heel air valve is located at the rear of the lower mold, and the inlet air valve is located at the upper part of the boot core mold.

11. The single-gate rubber mold according to claim 1, characterized in that, It also includes a middle plate, which is disposed between the upper die and the lower die, and the middle plate and the lower die form an extrusion cavity.

12. The single-gate rubber mold according to claim 11, characterized in that, The extrusion cavity is filled with rubber material in advance. When the lower mold, the middle plate and the upper mold are closed, the rubber material enters the molding cavity through the flow channel and is squeezed into the molding cavity around the boot core mold to form the boot body. The rubber material entering the extrusion chamber is squeezed to form the sole of the boot.

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