Mold for preparing film-coated insole

Abstract

The utility model relates to a mould for preparing a film-coated insole, which comprises an upper mould and a lower mould, the upper mould is provided with a feed inlet, the bottom surface of the upper mould is provided with at least one first mould core, the lower mould is detachably connected with at least one mould base, the first mould core and the mould base are arranged in a one-to-one correspondence mode, a forming cavity is arranged in the mould base, and the first mould core is arranged in the forming cavity. A plurality of negative pressure holes used for adsorbing the membranes are formed in the peripheral wall of the forming cavity, and the negative pressure holes penetrate through the die holder; during mold closing, the first mold cores are inserted into the forming cavities of the corresponding mold bases, the first mold cores, the forming cavities of the mold bases and the lower mold form a forming space of the insole, and the feeding port and the negative pressure hole are both communicated with the forming space. According to the utility model, the film-coated insole can be formed in one step, and the shape of the film-coated insole can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of shoe processing tools, and in particular to a mold for preparing a coated insole. Background Technology

[0002] The "popcorn" midsole boasts a durable, soft, and bouncy feel, along with a unique appearance unlike traditional midsoles, making it popular since its launch. The popcorn midsole is made by supercritically foaming ETPU particles into uniformly sized small foam particles, which are then injected into a mold and directly molded in a single process. During exercise, when subjected to high-intensity impacts, the force is dispersed among the numerous particles, absorbing the force and then transmitting it back to the body through energy feedback, thus achieving a cushioning and rebound effect. However, the popcorn midsole also has several drawbacks. For example, prolonged wear can easily scratch the surface, causing particles to fall off; over time, oxidation can occur, leading to yellowing; and currently, the color options for the popcorn midsole are somewhat limited.

[0003] The current solution is to first create a thin protective film made of TPU material, place this film in a molding die, and then inject the material into the die to obtain the coated popcorn insole. However, this operation requires two sets of molds, one for molding the film protective film and one for molding the popcorn insole, resulting in high equipment costs. In addition, if the film protective film deforms during demolding or transportation, it will affect the shape of the final popcorn insole, reducing the yield. Utility Model Content

[0004] The purpose of this invention is to provide a mold for preparing a coated insole, which can form a coated insole in one step with only one set of molds, and the shape of the coated insole can be guaranteed.

[0005] To achieve the above objectives, this utility model discloses a mold for preparing a coated insole, comprising an upper mold and a lower mold. The upper mold has a feed inlet and at least one first mold core on its bottom surface. The lower mold is detachably connected to at least one mold base. The first mold core and the mold base are arranged in a one-to-one correspondence. The mold base has a forming cavity, and the peripheral wall of the forming cavity has a negative pressure hole for adsorbing the film, and the negative pressure hole penetrates the mold base. When the mold is closed, the first mold core is inserted into the forming cavity of the corresponding mold base. The first mold core, the forming cavity of the mold base, and the lower mold form the forming space of the insole. The feed inlet and the negative pressure hole are both connected to the forming space.

[0006] After the above setup, by placing the mold in a sealed space that can create negative pressure, or by connecting the negative pressure hole to an external vacuum device, the film (such as TPU) placed in the molding cavity for preparing the coating is adsorbed by creating negative pressure through vacuuming, ensuring that the film adheres tightly to the cavity wall. After injecting material (such as ETPU) into the molding space, the insole with side-coated edges can be formed. Because the film can adhere tightly to the cavity wall, the shape of the formed insole can be well guaranteed to meet the design requirements.

[0007] Preferably, a uniform flow channel is provided on the outer wall of the mold base, and all the negative pressure holes are connected to the uniform flow channel; the uniform flow channel has an interface for connecting to an external air extraction device. The uniform flow channel facilitates the connection of the negative pressure holes to the external air extraction device.

[0008] Preferably, the lower mold has a second mold core that corresponds one-to-one with the first mold core. The second mold core is inserted into the corresponding molding cavity of the mold base, and the first mold core, the second mold core, and the molding cavity of the mold base cooperate to form the molding space of the insole. By setting the lower mold core, the molded insole is more aesthetically pleasing.

[0009] Preferably, at least a plurality of fixing members for fixing the diaphragm are provided on the upper end surface of the mold base. By setting the fixing members, the diaphragm is initially positioned before mold closing, which can prevent the diaphragm from deviating during mold closing, thereby ensuring that the insole of the film is reliably formed and the shape meets the design requirements.

[0010] Preferably, the fixing element is a needle, and it is arranged around the outer periphery of the cavity opening of the molding cavity. The needle design allows for easy piercing of the diaphragm, facilitating convenient diaphragm fixation.

[0011] Preferably, the lower mold is provided with a positioning element for positioning the mold base. By setting the positioning element, the position of the mold base can be stabilized, ensuring smooth mold closing.

[0012] Preferably, the membrane is a TPU membrane. TPU membrane has extremely high toughness, excellent scratch resistance, strong high-temperature stability, and strong ductility, making it particularly suitable as a membrane layer for coated insoles. It also facilitates the preparation of coated insoles using the mold of this invention.

[0013] Preferably, the membrane is a transparent membrane, a translucent membrane, or an opaque membrane. This configuration provides more options for the coated midsole, enriching its appearance.

[0014] Preferably, a pattern can be provided on the diaphragm. Providing a pattern on the diaphragm can enrich the appearance of the midsole, especially when the midsole is made of ETPU material. Due to the material characteristics, it is difficult to apply patterns to the popcorn midsole. This design can add more special value to the popcorn midsole.

[0015] This utility model has the following beneficial effects:

[0016] By placing a diaphragm on the cavity wall of the mold base and using negative pressure adsorption to ensure the diaphragm adheres tightly to the cavity wall, the injection molding process is virtually unaffected by the diaphragm, thus guaranteeing that the molded insole shape meets design requirements. Furthermore, this mold allows for the one-step molding of the coated insole, resulting in low equipment costs and a high degree of adhesion between the diaphragm and the insole, reducing the likelihood of peeling and producing a high-quality coated insole. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of Example 1 (in the mold-open state).

[0018] Figure 2 This is a schematic diagram from another perspective of Example 1 (mold open state).

[0019] Figure 3 This is a schematic diagram of Example 1 (mold closed state).

[0020] Figure 4 This is a partial cross-sectional view of the molded state in Embodiment 1.

[0021] Figure 5 This is a schematic diagram of the upper mold in Example 1.

[0022] Figure 6 This is a schematic diagram of one of the mold bases in Embodiment 1.

[0023] Figure 7 This is a cross-sectional view of one of the mold bases in Embodiment 1.

[0024] Figure 8 This is a cross-sectional view of one of the mold bases in Embodiment 2.

[0025] Figure 9 This is a schematic diagram of one of the mold bases in Embodiment 3.

[0026] Figure 10 This is a partial cross-sectional view of the molded state in Example 3.

[0027] Explanation of symbols for main components:

[0028] Upper fixing plate 11, upper mold core 12, feed port 13, abutment part 14;

[0029] Lower fixing plate 21, positioning component 211, clearance hole 212, lower mold core 22, mold base 23, guide hole 231, forming cavity 232, fixing component 233, negative pressure hole 234, uniform flow channel 237, forming space 24. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] like Figure 1-7 As shown, this embodiment discloses a mold for preparing a coated insole, which is used to form a pair of popcorn insoles with coated sides in one step. Specifically, the mold includes an upper mold and a lower mold. The upper mold includes an upper fixed plate 11 and two mutually symmetrical upper mold cores 12. The upper mold cores 12 are bolted to the bottom of the upper fixed plate 11, and the upper mold cores 12 are provided with a feed port 13. Of course, the feed port 13 can also be located in the lower mold.

[0033] The lower mold includes a lower fixed plate 21 and two mold bases 23, with the upper mold core 12 corresponding to each mold base 23. The mold base 23 is detachably connected to the lower fixed plate 21. Specifically, the lower fixed plate 21 is provided with a positioning element 211 for positioning the mold base 23. The positioning element 211 can be a positioning post. At the same time, the mold base 23 can be provided with a guide hole 231 that matches the positioning element 211. Through the insertion and cooperation of the guide hole 231 with the positioning post, the mold base 23 is positioned in the horizontal direction, and the mold base 23 is detachably connected to the lower fixed plate 21. Under its own weight, the mold base 23 can abut against the lower fixed plate 21. In order to ensure that the mold base 23 is positioned in the vertical direction when the mold is closed, an abutment 14 is provided at the bottom of the upper fixed plate 11. When the mold is closed, the abutment 14 presses the mold base 23 against the lower fixed plate 21.

[0034] The mold base 23 has a molding cavity 232, into which the upper mold core 12 can be inserted. The upper mold core 12, the lower fixing plate 21, and the molding cavity 232 of the mold base 23 cooperate to form the molding space 24 of the midsole. Several fixing members 233 for fixing the diaphragm are provided on both the upper and lower end faces of the mold base 23. The fixing members 233 are pins and are arranged around the outer periphery of the opening of the molding cavity 232. The lower fixing plate 21 has clearance holes 212 to avoid the fixing members 233. Because the abutment member 14 is offset from the fixing members 233 on the upper end face of the mold base 23, the clearance holes 212 on the upper fixing plate 11 are unnecessary. By fixing the diaphragm with fixing members 233 on both the upper and lower end faces of the mold base 23, the diaphragm can be reliably fixed.

[0035] A number of negative pressure holes 234 are provided on the cavity wall of the molding cavity 232. The negative pressure holes 234 are arranged at intervals in the circumferential direction of the molding cavity 232 and penetrate the mold base 23.

[0036] The steps for forming the inner bottom of coated popcorn using the mold of this utility model are as follows:

[0037] 1. Place the film (TPU film) into the molding cavity 232, and insert the fixing member 233 into the edge of the film to initially position it. Of course, if the film can be laid neatly and will not shift unnecessarily, the fixing member 233 can be omitted. Using the fixing member 233 to fix the film is simple and can better ensure a high yield rate.

[0038] 2. Mold closing.

[0039] 3. By introducing high-temperature gas (such as steam) into the molding space 24, or by heating the mold, the diaphragm is softened, and air is extracted from the negative pressure hole 234 to form a negative pressure, so that the diaphragm adheres tightly to the cavity wall of the molding cavity 232; the entire mold can be placed in a relatively closed space that can form a negative pressure, and by extracting air from this space, the diaphragm adheres tightly to the cavity wall of the molding cavity 232.

[0040] 4. Inject ETPU granules into the molding space 24.

[0041] 5. Open the mold, take out the material, let it cool at room temperature, trim and tidy up the edges to obtain the film-coated popcorn base.

[0042] It should be noted that the insole formed by the mold of this utility model mainly has a film wrapped around its side edges, without the need for overall film wrapping, which can save materials and reduce costs. In addition, the film that is preferably used with the mold of this utility model is a TPU film, which can be a transparent film, a semi-transparent film, or an opaque film. Furthermore, patterns can also be provided on the film.

[0043] Example 2

[0044] like Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that a uniform flow channel 237 is provided on the outer wall of the mold base 23, and all the negative pressure holes 234 are connected to the uniform flow channel 237. The uniform flow channel 237 has an interface for connecting to an external air extraction device. The external air extraction device is connected through the interface pipe, thereby drawing air from the negative pressure holes 234 to form a negative pressure.

[0045] Example 3

[0046] like Figure 9 and Figure 10 As shown, the difference between this embodiment and any of the above embodiments is that a lower mold core 22 is also provided. The lower mold core 22 is located at the bottom of the molding cavity 232. The lower mold core 22 can be fixed by screws, or the lower mold core 22 can be integrally formed with the mold base 23. In this case, the upper mold core 12, the lower mold core 22 and the molding cavity 232 of the mold base 23 cooperate to form the molding space 24 of the insole.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mold for preparing a coated insole, characterized in that: The mold includes an upper mold and a lower mold. The upper mold has a feed port (13) and the bottom surface of the upper mold has at least one first mold core (12). The lower mold is detachably connected to at least one mold base (23). The first mold core (12) and the mold base (23) are arranged in a one-to-one correspondence. The mold base (23) has a forming cavity (232). The periphery of the forming cavity (232) has a plurality of negative pressure holes (234) for adsorbing the film, and the negative pressure holes (234) penetrate the mold base (23). When the mold is closed, the first mold core (12) is inserted into the forming cavity (232) of the corresponding mold base (23). The first mold core (12), the forming cavity (232) of the mold base (23) and the lower mold cooperate to form the forming space (24) of the middle bottom. The feed port (13) and the negative pressure holes (234) are both connected to the forming space (24).

2. The mold for preparing the coated midsole according to claim 1, characterized in that: The outer wall of the mold base (23) is provided with a ring of uniform flow channel (237), and all the negative pressure holes (234) are connected to the uniform flow channel (237); the uniform flow channel (237) has an interface for connecting to an external air extraction device.

3. The mold for preparing the coated insole as described in claim 1, characterized in that: The lower mold is provided with a second mold core (22) that corresponds one-to-one with the first mold core (12). The second mold core (22) is inserted into the corresponding mold base forming cavity (232). The first mold core (12), the second mold core (22) and the forming cavity (232) of the mold base (23) cooperate to form the forming space (24) of the midsole.

4. The mold for preparing the coated insole as described in claim 1, characterized in that: At least a number of fasteners (233) for fixing the diaphragm are provided on the upper surface of the mold base (23).

5. The mold for preparing the coated midsole according to claim 4, characterized in that: The fixing member (233) is a needle, and the fixing member (233) is arranged around the outer periphery of the cavity opening of the molding cavity (232).

6. The mold for preparing the coated insole according to claim 1, characterized in that: The lower mold is provided with a positioning element (211) for positioning the mold base (23).

7. The mold for preparing the coated insole according to claim 1, characterized in that: The membrane is a TPU membrane.

8. The mold for preparing the coated insole according to claim 1, characterized in that: The membrane is a transparent membrane, a semi-transparent membrane, or an opaque membrane.

9. The mold for preparing the coated insole according to claim 1, characterized in that: Patterns can be set on the diaphragm.

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