Mold structure for shoe sole film covering

Abstract

The utility model relates to the field of shoe sole production, and provides a mold structure for shoe sole film covering, which comprises an upper mold and a lower mold, and the lower mold is provided with a mold cavity; the lower die is provided with a plurality of exhaust channels, the exhaust channels are uniformly distributed on the cavity wall of the die cavity, one end of each exhaust channel is communicated with the die cavity, and the other end of each exhaust channel is communicated with a vacuum adsorption device; a puncturing structure is arranged in the exhaust channel and used for abutting against the thin film. The ETPU foamed bead has the advantages that the effect of adsorbing and positioning of the film is not affected while the effect that steam penetrates through the ETPU foamed bead is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shoe sole production, in particular to a shoe sole film coating mold structure. BACKGROUND

[0002] The popcorn shoe sole, also known as ETPU, is a new type of high polymer material formed by a plurality of TPU foaming beads with large elasticity and light weight, which has the advantages of light weight, high elasticity, biodegradability, etc.

[0003] After a long time of use, the popcorn shoe sole is prone to damage due to particle peeling, so the popcorn shoe sole is coated with a film to reduce the possibility of popcorn particle peeling and improve the structural stability of the shoe sole.

[0004] When coating the shoe sole with a film, the film is first vacuum adsorbed in the mold cavity of the mold, then the E-TPU foaming beads are punched into the cavity formed by the film, and then steam heating is performed. During steam heating, the steam needs to pass through the gaps between the ETPU foaming beads, and then be discharged from the gaps between the ETPU foaming beads after the ETPU foaming beads are uniformly heated. However, since the film has been pre-adsorbed on the cavity wall of the mold cavity, the steam is difficult to discharge from the film and will remain between the ETPU foaming beads, which will affect the molding of the ETPU. The prior art usually provides openings on the film in advance, but this will affect the adsorption positioning of the film, resulting in poor film coating effect. Content of the utility model

[0005] In order not to affect the penetration of steam through the ETPU foaming beads while not affecting the adsorption positioning of the film, the present application provides a mold structure for shoe sole film coating.

[0006] The mold structure for shoe sole film coating provided by the present application adopts the following technical solution:

[0007] A mold structure for shoe sole film coating, comprising an upper mold and a lower mold, the lower mold having a mold cavity; the lower mold is provided with a plurality of exhaust channels, the plurality of exhaust channels are uniformly distributed on the cavity wall of the mold cavity, one end of the exhaust channel is communicated with the mold cavity, and the other end is communicated with a vacuum adsorption device; the exhaust channel is provided with a puncture structure for abutting the film.

[0008] By adopting the technical scheme, when the popcorn shoe sole is produced, the film is first covered at the opening position of the mold cavity of the lower mold, then the vacuum suction device is started, the gas in the mold cavity is sucked out from the exhaust channel by the vacuum suction device, so that the film is attached to the cavity wall of the mold cavity to form a containing cavity; then the ETPU foaming beads are filled into the containing cavity, and steam is introduced; when the exhaust is performed, the vacuum suction device is started again to apply force to the film for the second time, a greater suction force is applied, the film is sucked into the exhaust channel, and the film is abutted against the piercing structure, the force is continuously applied to make the piercing structure pierce the film to form an exhaust hole, and the steam is exhausted from the exhaust hole. By using the above structure and method, the steam can penetrate the ETPU foaming beads without the need of pre-punching the film, and the suction positioning of the film is not affected.

[0009] Optionally, the lower mold is provided with a plurality of suction channels, the plurality of suction channels are uniformly distributed on the cavity wall of the mold cavity, one end of the suction channel is communicated with the mold cavity, and the other end is communicated with the vacuum suction device.

[0010] By adopting the technical scheme, when the film is attached to the cavity wall of the mold cavity, force is applied to the film through the suction channel, so that the force position of the film is staggered with the position of the piercing structure in the process, and the possibility that the film is pierced by the piercing structure due to excessive force is reduced.

[0011] Optionally, the plurality of exhaust channels are distributed in a matrix in the lower mold, the plurality of suction channels are distributed in a matrix in the lower mold, and the exhaust channels and the suction channels are staggered.

[0012] By adopting the technical scheme, the uniformity of the force of the film in the process of being attached to the cavity wall of the mold cavity and the process of being attached to the exhaust channel is ensured.

[0013] Optionally, the piercing structure comprises a connecting piece and a piercing piece, the connecting piece is connected to the cavity wall of the exhaust channel, a plurality of ventilation holes for gas passing through are formed in the connecting piece, the piercing piece is connected to the upper surface of the connecting piece, the piercing piece is arranged along the length direction of the exhaust channel, and one end of the piercing piece close to the upper mold is a pointed end.

[0014] By adopting the technical scheme, in the process of applying force to the film through the exhaust channel, the piercing piece is located at the position where the film first reaches, so that the piercing is facilitated.

[0015] Optionally, along from one end of the piercing piece close to the upper mold to the other end, the outer diameter of the piercing piece first increases and then decreases.

[0016] By adopting the technical scheme, in the process of applying force to the film from the exhaust passage, the film continuously moves to the position close to the tip of the piercing member. By this design, in the process of continuous movement, the film is first pierced to form an exhaust hole, then the exhaust hole is enlarged, and then at the part where the outer diameter of the piercing member is reduced, a gap is formed between the edge of the exhaust hole and the outer wall of the piercing member, ensuring that the steam can be discharged from the gap, reducing the possibility of the piercing member blocking the exhaust hole.

[0017] Optionally, the piercing structure includes a plurality of piercing members, the plurality of piercing members are connected to the cavity wall of the exhaust passage, and the plurality of piercing members are arranged at intervals around the central axis of the exhaust passage; and the piercing members are arranged obliquely.

[0018] By adopting the technical scheme, in the process of applying force to the film from the exhaust passage, the film continuously moves to the position close to the tip of the piercing member. By this design, in the process of continuous movement, the film is first pierced to form an exhaust hole, then the exhaust hole is enlarged, and then at the part where the outer diameter of the piercing member is reduced, a gap is formed between the edge of the exhaust hole and the outer wall of the piercing member, ensuring that the steam can be discharged from the gap, reducing the possibility of the piercing member blocking the exhaust hole.

[0019] Optionally, the middle mold frame is arranged between the upper mold and the lower mold, and the middle mold frame is used for pressing the film.

[0020] By adopting the technical scheme, after the film is laid on the lower mold, the middle mold frame and the lower mold are closed, and the film is positioned by pressing the film with the middle mold frame, so that displacement of the film during adsorption is avoided, and the stability of subsequent positioning of the film is ensured.

[0021] Optionally, the surface of the upper mold facing the lower mold is provided with a steam pipe, and the steam pipe is provided with a plurality of steam outlets, and the plurality of steam outlets are all directed to the mold cavity.

[0022] By adopting the technical scheme, after the ETPU foaming beads are filled into the accommodating cavity formed by the film, steam is introduced through the steam pipe, and the steam flows into the accommodating cavity from the steam outlets, and then shuttles in the gaps between the ETPU foaming beads, so that the ETPU foaming beads are preheated by the steam (in the above process, the upper mold and the lower mold are not closed), and the molding effect of the sole is improved.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. By arranging the exhaust passage in the lower mold, arranging the piercing structure in the exhaust passage, and then adsorbing the film into the exhaust passage after the ETPU foaming beads are put into the accommodating cavity formed by the film, the film is pierced by the piercing member to form an exhaust hole, so that the steam can flow out of the exhaust hole and the exhaust passage, without affecting the molding of the sole and the positioning of the film.

[0025] 2. By setting the outer diameter of the puncturing element to first increase and then decrease, after the puncturing element punctures the film to form an exhaust hole, the exhaust hole first increases in size, and then a gap is formed between the exhaust hole and the outer diameter of the puncturing element, which facilitates the smooth discharge of steam.

[0026] 3. By preheating the ETPU foam beads in the cavity formed by the film before the upper and lower molds are closed, the molding effect of the shoe sole is improved. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0028] Figure 2 yes Figure 1 Enlarged diagram of part A.

[0029] Figure 3 This is a schematic diagram illustrating the state of the film after it is punctured in Example 1.

[0030] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Upper mold; 11. Steam pipe; 12. Steam outlet; 2. Middle mold frame; 3. Lower mold; 31. Mold cavity; 32. Exhaust channel; 33. Puncture structure; 331. Connecting piece; 332. Puncture piece; 333. Vent hole; 34. Adsorption channel; 4. Membrane; 41. Exhaust hole. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0033] This application discloses a mold structure for shoe sole coating.

[0034] Example 1

[0035] Reference Figure 1 A mold structure for shoe sole coating includes an upper mold 1, a middle mold frame 2, and a lower mold 3.

[0036] The lower mold 3 has a mold cavity 31, and the middle mold frame 2 is located between the upper mold 1 and the lower mold 3. The middle mold frame 2 is used to press the film 4 and limit and fix the film 4 above the mold cavity 31 of the lower mold 3.

[0037] The lower mold 3 has several venting channels 32, which are evenly distributed in a matrix on the cavity wall of the mold cavity 31. One end of each venting channel 32 is connected to the mold cavity 31, and the other end is connected to the vacuum adsorption device. A puncture structure 33 is provided in the venting channel 32 for the film 4 to abut against.

[0038] The lower mold 3 is also provided with a plurality of adsorption channels 34 which are arranged in a matrix on the cavity wall of the mold cavity 31. One end of the adsorption channel 34 is communicated with the mold cavity 31, and the other end is communicated with the vacuum adsorption device. The adsorption channel 34 is arranged in a staggered manner with the exhaust channel 32.

[0039] The surface of the upper mold 1 facing the lower mold 3 is provided with a steam pipe 11, and the steam pipe 11 is provided with a plurality of steam outlets 12, and the plurality of steam outlets 12 are all directed to the mold cavity 31.

[0040] When producing the popcorn shoe sole, first, the film 4 is laid on the lower mold 3, then the middle mold frame 2 is combined with the lower mold 3, and the film 4 is pressed on the mold cavity 31 of the upper mold 1 by the middle mold frame 2; then the gas in the mold cavity 31 is sucked out from the adsorption channel 34 by the vacuum adsorption device, and in the process of sucking out, the film 4 is gradually attached to the cavity wall of the mold cavity 31 and forms a containing cavity; then the ETPU foaming beads are filled into the containing cavity formed by the film 4 through the feeding structure of the upper mold 1, at this time the upper mold 1 and the lower mold 3 are not combined; then steam is introduced into the lower mold 3 through the steam pipe 11, and the ETPU foaming beads in the containing cavity are preheated, the purpose of preheating is to make the temperature uniformly distributed in the interior of the ETPU foaming beads before the ETPU foaming beads are compacted (in this process, the upper mold 1 and the lower mold 3 are still not completely combined, there is a combined gap of about 3-8 mm, the purpose is to not compact the ETPU foaming beads first, to ensure the smoothness of the steam flowing in the gap between the ETPU foaming beads, and then to ensure the uniformity of preheating); after preheating, the upper mold and the middle mold are combined, then the film 4 is secondly forced and a greater force is applied to the film 4 from the position of the exhaust channel 32 by the vacuum adsorption device, the film 4 is sucked into the exhaust channel 32 from the exhaust channel 32, so that the film 4 abuts against the piercing structure 33, the film 4 is pierced by the piercing structure 33 to form an exhaust hole 41, and the steam is discharged from the exhaust hole 41 to the containing cavity, so as to realize the penetration and discharge of the steam, and also there is no need to pre-punch the film 4, which is convenient for positioning the film 4.

[0041] It can be understood that only the exhaust channel 32 can be provided, and the gas in the mold cavity 31 is sucked from the exhaust channel 32 when the film 4 is adsorbed, after the film 4 is attached to the cavity wall of the mold cavity 31, the vacuum adsorption device is first closed, after the ETPU foaming beads are added, the steam is introduced, and the upper mold 1 and the lower mold 3 are combined, the vacuum adsorption device is re-opened, and the film 4 is sucked into the exhaust channel 32 for piercing.

[0042] The adsorption channel 34 is designed and arranged staggered with the exhaust channel 32 to stagger the main stress position of the film 4 and the position of the piercing structure 33 when the film 4 is adsorbed to the mold cavity 31, so as to reduce the possibility of the film 4 being pierced during the adsorption process and ensure the subsequent preheating effect.

[0043] With reference to Figure 2 and Figure 3 Specifically, in the present embodiment, the piercing structure 33 comprises a connecting sheet 331 and a piercing piece 332. The connecting sheet 331 is located in the exhaust channel 32 and connected to the cavity wall of the exhaust channel 32, and a plurality of ventilation holes 333 for gas passing through are provided through the connecting sheet 331. The piercing piece 332 is connected to the upper surface of the connecting sheet 331, and the piercing piece 332 is arranged along the length direction of the exhaust channel 32, and the end of the piercing piece 332 away from the connecting sheet 331 is provided as a sharp end.

[0044] From the end of the piercing piece 332 close to the upper die 1 to the other end, the outer diameter of the piercing piece 332 first increases and then decreases. During the process of applying force to the film 4 from the exhaust channel 32, the film 4 continuously moves to the position close to the sharp end of the piercing piece 332. By this design, during the continuous movement, the film 4 is first pierced to form an exhaust hole 41, then the exhaust hole 41 is enlarged, and then at the part where the outer diameter of the piercing piece 332 decreases, a gap is formed between the edge of the exhaust hole 41 and the outer wall of the piercing piece 332, which ensures that steam can be discharged from the gap and reduces the possibility of the piercing piece 332 blocking the exhaust hole 41.

[0045] The piercing structure 33 can be made by 3D printing technology.

[0046] The implementation principle of embodiment 1 is that, when producing the popcorn shoe sole, the film 4 is first laid on the lower mold 3, then the middle mold frame 2 is combined with the lower mold 3, and the film 4 is pressed on the cavity 31 of the upper mold 1 by the middle mold frame 2; then the gas in the cavity 31 is sucked out from the suction channel 34 by the vacuum suction device, and in the process of suction, the film 4 is gradually attached to the cavity wall of the cavity 31 due to the air pressure and forms a containing cavity; then the ETPU foaming beads are filled into the containing cavity formed by the film 4 through the feeding structure of the upper mold 1, and at this time the upper mold 1 and the lower mold 3 are not combined; then steam is introduced into the lower mold 3 through the steam pipeline 11 to preheat the ETPU foaming beads in the containing cavity, and the purpose of preheating is to uniformly distribute the temperature in the interior of the ETPU foaming beads before the ETPU foaming beads are compacted (in this process, the upper mold 1 and the lower mold 3 are still not completely combined, and there is a combined gap, such as a gap of about 3-8 mm, and the purpose is to not compact the ETPU foaming beads first, to ensure the smoothness of the steam flowing in the gap between the ETPU foaming beads, and to ensure the uniformity of preheating); then the film 4 is forced into the exhaust channel 32 from the exhaust channel 32 by the vacuum suction device from the position of the exhaust channel 32, so that the film 4 abuts against the piercing structure 33, the film 4 is pierced by the piercing structure 33 to form an exhaust hole 41, and the steam is discharged from the containing cavity through the exhaust hole 41, so as to realize the penetration and discharge of the steam, and also there is no need to pre-punch the film 4, which is convenient for positioning of the film 4.

[0047] Embodiment 2

[0048] With reference to Figure 4 The difference between this embodiment and embodiment 1 is that the piercing structure 33 is different.

[0049] In this embodiment, the piercing structure 33 includes a plurality of piercing pieces 332, and the plurality of piercing pieces 332 are connected to the cavity wall of the exhaust channel 32. The plurality of piercing pieces 332 are arranged at intervals around the central axis of the exhaust channel 32, and the plurality of piercing pieces 332 are inclinedly arranged. By virtue of the design, in the process of forcing the film 4 in the exhaust channel 32, the film 4 is first pierced by the tip of the piercing piece 332 to form an exhaust hole 41; then the film 4 continues to move, and since the piercing pieces 332 are inclinedly arranged, the exhaust hole 41 gradually increases under the force of the piercing piece 332, so as to ensure that the steam can be smoothly discharged from the gap.

[0050] In this embodiment, the piercing piece 332 is conical.

[0051] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made on the basis of the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A mold structure for a shoe sole film, characterized by: The upper die (1) and the lower die (3) are included, and the lower die (3) has a die cavity (31); the lower die (3) is provided with a plurality of exhaust channels (32), and the plurality of exhaust channels (32) are uniformly distributed on the cavity wall of the die cavity (31), one end of the exhaust channel (32) is communicated with the die cavity (31), and the other end is communicated with a vacuum suction device; The exhaust channel (32) is provided with a piercing structure (33), and the piercing structure (33) is used for abutting the film (4).

2. The mold structure for shoe sole film covering according to claim 1, wherein: The lower die (3) is provided with a plurality of suction channels (34), and the plurality of suction channels (34) are uniformly distributed on the cavity wall of the die cavity (31), one end of the suction channel (34) is communicated with the die cavity (31), and the other end is communicated with a vacuum suction device.

3. The mold structure for shoe sole film covering according to claim 2, wherein: The plurality of exhaust channels (32) are distributed in a matrix on the lower die (3), the plurality of suction channels (34) are distributed in a matrix on the lower die (3), and the exhaust channels (32) and the suction channels (34) are arranged in a staggered manner.

4. The mold structure for shoe sole film covering according to claim 1, wherein: The piercing structure (33) includes a connecting sheet (331) and a piercing piece (332), the connecting sheet (331) is connected to the cavity wall of the exhaust channel (32), the connecting sheet (331) is provided with a plurality of ventilation holes (333) for gas passing through; the piercing piece (332) is connected to the upper surface of the connecting sheet (331), the piercing piece (332) is arranged along the length direction of the exhaust channel (32), and one end of the piercing piece (332) close to the upper die (1) is a pointed end.

5. The mold structure for shoe sole film covering according to claim 4, wherein: From one end of the piercing piece (332) close to the upper die (1) to the other end, the outer diameter of the piercing piece (332) first increases and then decreases.

6. The mold structure for shoe sole film covering according to claim 1, wherein: The piercing structure (33) includes a plurality of piercing pieces (332), the plurality of piercing pieces (332) are connected to the cavity wall of the exhaust channel (32), and the plurality of piercing pieces (332) are arranged at intervals around the central axis of the exhaust channel (32); the piercing piece (332) is arranged obliquely.

7. The mold structure for shoe sole film covering according to claim 1, wherein: It also includes a middle die frame (2), the middle die frame (2) is located between the upper die (1) and the lower die (3), and the middle die frame (2) is used for pressing the film (4).

8. The mold structure for shoe sole film covering according to claim 1, wherein: The surface of the upper die (1) facing the lower die (3) is provided with a steam pipe (11), the steam pipe (11) is provided with a plurality of steam outlets (12), and the plurality of steam outlets (12) are all directed to the die cavity (31).

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