Low-density high-physical-property shoe sole and manufacturing method thereof

Abstract

The invention discloses a low-density high-physical-property shoe sole and a manufacturing method thereof.The low-density high-physical-property shoe sole comprises a low-density lining, a medium-density side wall and a high-density lower sole, the medium-density side wall is connected to the side portion of the low-density lining and surrounds the low-density lining, and the high-density lower sole is connected to the side portion of the medium-density side wall and surrounds the low-density lining. The high-density lower sole is connected with the low-density lining and the middle-density side wall and covers the bottom of the low-density lining and the bottom of the middle-density side wall. Wherein the high-density lower sole can be used as a part in contact with the ground to ensure that the lower sole has enough strength and wear resistance, the low-density lining can be used as a part in contact with the sole of a user to ensure the softness, comfort and good bending performance of the contact part, and the medium-density side wall can provide strong lateral support for the low-density lining, so that the service life of the sole is prolonged, and the service life of the sole is prolonged. The low-density lining is shaped, the wearing stability of the shoe sole is improved, and the overall supporting performance of the shoe sole is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of sole design, and more particularly to a low-density high-physical-property sole and a manufacturing method thereof. Background Art

[0002] As the direct part in contact with the user's sole and the ground, the sole is a key structure of the shoe. At present, many soles are of an integrally formed structure. Among them, the integrally formed soles are mostly made of materials such as PU. In order to ensure that the formed sole has high strength, wear resistance and other physical properties, it is usually necessary to use high-density materials for production. However, the integrally formed sole made of high-density materials has a large mass, poor softness, poor comfort, and poor resilience and shock absorption effects.

[0003] To solve the above problems, many soles now also adopt a bonded composite structure, which is formed by bonding an upper layer made of a material with a lower density to a lower layer made of a material with a higher density. This method can ensure that the part in contact with the user's sole has good softness and comfort, while the part in contact with the ground has high strength and wear resistance. However, since this sole is obtained by bonding, the upper layer and the lower layer in the sole are prone to separation due to the failure of the glue layer, resulting in damage to the sole. Moreover, although the upper layer can ensure softness, its supporting strength is difficult to guarantee. Under long-term use, the upper layer is prone to collapse, affecting the wearing stability of the sole. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-density high-physical-property sole and a manufacturing method thereof, which can solve one or more of the above problems.

[0005] According to one aspect of the present invention, there is provided a low-density high-physical-property sole, including a low-density inner layer, a medium-density side surround, and a high-density bottom. The medium-density side surround is connected to the side of the low-density inner layer and surrounds the low-density inner layer. The high-density bottom is connected to both the low-density inner layer and the medium-density side surround and covers the bottoms of the low-density inner layer and the medium-density side surround.

[0006] The beneficial effects of this low-density high-physical-property sole are as follows: In this sole, the low density, medium density, and high density are relative to each other. Among them, the high-density bottom can be used as the part in contact with the ground, ensuring that the bottom has sufficient strength and wear resistance. The low-density inner layer can be used as the part in contact with the user's sole to ensure the softness, comfort, and good bendability of this contact part. And a medium-density side surround is arranged on the side of the low-density inner layer. It has a higher strength compared to the low-density inner layer, providing strong lateral support for the low-density inner layer, shaping the low-density inner layer, improving the stability of the sole during wearing, ensuring the overall support of the sole. At the same time, the medium-density side surround is lighter compared to the side surround made of high-density materials.

[0007] In some embodiments, the low-density inner lining is a PU inner lining with a density of 0.14 to 0.3 g / cm 3 . Under actual measurement, this low-density inner lining has good softness and comfort.

[0008] In some embodiments, the low-density inner lining is a PU recycled material inner lining with a density of 0.14 to 0.35 g / cm 3 . Using a PU recycled material inner lining can effectively improve the environmental friendliness of this sole.

[0009] In some embodiments, the medium-density side surround is a PU side surround with a density of 0.3 to 0.5 g / cm 3 .

[0010] In some embodiments, the high-density bottom is a PU bottom with a density of 0.5 to 1 g / cm 3 .

[0011] In some embodiments, the longitudinal thickness of the high-density bottom is 1.5 cm to 4 cm, and the transverse thickness of the medium-density side surround is 1.5 cm to 4 cm.

[0012] According to one aspect of the present invention, there is provided a method for manufacturing a low-density high-physical-property sole, comprising the following steps:

[0013] Step a, take a first open mold, the first open mold is provided with a first mold cavity, open the first mold cavity, pour a foamable high-density material into the first mold cavity so that the high-density material fills the first mold cavity, and then close the first mold cavity. After the high-density material foams and cools and forms, a high-density bottom is obtained;

[0014] Step b, take a second open mold, the second open mold is provided with a second mold cavity, open the second mold cavity, place the high-density bottom into the second mold cavity, and there is a core block in the second mold cavity. Place the core block on the high-density bottom to form a space in the second mold cavity, spray a foamable medium-density material into the space so that the medium-density material fills the space, and then close the second mold cavity. After the medium-density material foams and cools and forms, a semi-finished product is obtained;

[0015] Step c, take a sealed mold, the sealed mold is provided with a third mold cavity, open the third mold cavity, place the semi-finished product into the third mold cavity, and then close the third mold cavity. High-pressure extrude a foamable low-density material into the third mold cavity so that the low-density material fills the third mold cavity. After the low-density material foams and cools and forms, a low-density high-physical-property sole is obtained.

[0016] The beneficial effects of the manufacturing method of this low-density high-physical-property sole are as follows: In the low-density inner layer, medium-density side perimeter, and high-density bottom layer of the low-density high-physical-property sole formed under the above manufacturing method, the connection is not achieved by adhesion but directly by the cooling and solidification of the foaming material. The connection has strong reliability and is not prone to separation. Moreover, the low-density material is formed by being extruded into a sealed mold under high pressure, which can effectively reduce the air contained during its molding. The medium-density side perimeter has a smaller transverse thickness and a larger longitudinal thickness. Correspondingly, the width of the space is small and the depth is large. The spraying method can make the material be more evenly arranged in the space. Since the high-density bottom layer is located at the outermost periphery during processing, the perfusion processing method is relatively simple and efficient, and is easy to implement. Additionally, in this method, the high-density bottom layer is formed first, then the medium-density side perimeter is formed, and finally the low-density inner layer is formed. In this way, the non-deformable outer periphery can be formed first, so that when the low-density inner layer is finally formed, it is not prone to deformation and has stronger stability.

[0017] In some embodiments, the low-density material is a PU material with a density of 0.14 - 0.3 g / cm 3 or a PU recycled material with a density of 0.14 - 0.35 g / cm 3 The medium-density material is a PU material with a density of 0.3 - 0.5 g / cm 3 The high-density material is a PU material with a density of 0.5 - 1 g / cm 3

[0018] In some embodiments, the foaming temperature of the PU material is 50°C - 60°C.

[0019] In some embodiments, the sealed mold includes a lower mold, an upper mold, and a stirring and pressurizing injection mechanism. One side of the upper mold is hinged to the lower mold. The third mold cavity is provided on the lower mold. The stirring and pressurizing injection mechanism includes a housing and a screw. A stirring cavity is provided inside the housing, and the screw is provided in the stirring cavity. The stirring cavity is connected to the third mold cavity. The upper mold is provided with an air flow channel, and the air flow channel is connected to the third mold cavity. When feeding into the third mold cavity of this sealed mold, the upper mold and the lower mold can be in a closed mold state to enclose the third mold cavity. And the addition of the low-density material in a foaming state to the third mold cavity can be achieved by relying on the stirring and pressurizing injection mechanism. Moreover, when the low-density material in a foaming state is added, it can be fully stirred and pressurized in the stirring cavity. Stirring can improve its uniformity. When the pressurized low-density material in a foaming state is injected, it can squeeze the air in the third mold cavity and press out the air in the third mold cavity through the air flow channel, so as to fully reduce the air in the third mold cavity and reduce the pores contained in the low-density inner layer. Description of the Drawings

[0020] Figure 1 ​Schematic structural diagram of a low-density and high-physical-property sole according to an embodiment of the present invention.

[0021] Figure 2 Cross-sectional view of the schematic structural diagram of a low-density and high-physical-property sole according to an embodiment of the present invention.

[0022] Figure 3 Cross-sectional view of the schematic structural diagram when a first open mold of a low-density and high-physical-property sole according to an embodiment of the present invention is in use.

[0023] Figure 4 Cross-sectional view of the schematic structural diagram when a second open mold of a low-density and high-physical-property sole according to an embodiment of the present invention is in use.

[0024] Figure 5 Cross-sectional view of the schematic structural diagram of a sealed mold of a low-density and high-physical-property sole according to an embodiment of the present invention.

[0025] In the figure: 1. Low-density inner lining, 2. Medium-density side surround, 3. High-density bottom, 10. Sealed mold, 101. Lower mold, 102. Upper mold, 103. Stirring and pressurizing injection mechanism, 100. Third mold cavity, 1031. Shell, 1032. Screw, 1021. Air flow channel, 20. Second open mold, 200. Second mold cavity, 201. First lower mold, 202. First upper mold, 30. First open mold, 300. First mold cavity, 301. Second lower mold, 302. Second upper mold, 400. Core block, 500. Space. Specific embodiments

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] Reference Figure 1 And Figure 2 A low-density and high-physical-property sole of this embodiment includes a low-density inner lining 1, a medium-density side surround 2, and a high-density bottom 3.

[0029] Among them, the low density, medium density, and high density referred to in the low-density inner lining 1, medium-density side surround 2, and high-density bottom 3 are relative to each other, that is, the density of the low-density inner lining 1 should be less than the density of the medium-density side surround 2 and the density of the high-density bottom 3. At the same time, the density of the medium-density side surround 2 should be less than the density of the high-density bottom 3.

[0030] In this embodiment, the low-density inner lining 1 can be a PU inner lining with a density of 0.14 - 0.3 g / cm 3 and the medium-density side surround 2 is 0.3 - 0.5 g / cm 3The PU side enclosure, the high-density bottom 3 can be 0.5 to 1 g / cm 3 The PU bottom, and the densities of the actual low-density inner layer 1, medium-density side enclosure 2, and high-density bottom 3 can be different at each part, but should be within the above range.

[0031] In addition, preferably, the low-density inner layer 1 can also be 0.14 to 0.35 g / cm 3 The PU recycled material inner layer to improve the environmental protection of the low-density inner layer 1.

[0032] The medium-density side enclosure 2 is integrally connected to the side of the low-density inner layer 1 and surrounds the low-density inner layer 1, so that the side of the low-density inner layer 1 is not exposed. The high-density bottom 3 is integrally connected to both the bottom of the low-density inner layer 1 and the bottom of the medium-density side enclosure 2, and the high-density bottom 3 covers the bottoms of the low-density inner layer 1 and the medium-density side enclosure 2, so that the bottoms of the low-density inner layer 1 and the medium-density side enclosure 2 are not exposed.

[0033] In order to ensure that the high-density bottom 3 has sufficient wear resistance, the longitudinal thickness of the high-density bottom 3 should be between 1.5 cm and 4 cm. In order to ensure that the medium-density side enclosure 2 has sufficient support performance for the low-density inner layer 1, the transverse thickness of the medium-density side enclosure 2 should also be between 1.5 cm and 4 cm.

[0034] In this low-density high-physical-property sole, when in use, the high-density bottom 3 can be the part in contact with the ground, which can ensure that the bottom has sufficient strength and wear resistance. The low-density inner layer 1 can be the part in contact with the user's sole to ensure the softness and comfort of this contact part, and at the same time has good bendability. And a medium-density side enclosure 2 is arranged on the side of the low-density inner layer 1, which has higher strength compared to the low-density inner layer 1, to provide strong lateral support for the low-density inner layer 1, play a shaping role for the low-density inner layer 1, ensure the stability of the sole when worn, ensure the overall support of the sole. At the same time, the medium-density side enclosure 2 is lighter compared to being made of high-density materials, and can effectively reduce the total weight requirement of this sole.

[0035] Example 2

[0036] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 And Figure 5 , a manufacturing method of a low-density high-physical-property sole of this embodiment includes the following steps:

[0037] Step a: Take the first open mold 30. The first open mold 30 includes a second lower mold 301 and a second upper mold 302. One side of the second upper mold 302 is hinged to the second lower mold 301, such that this side of the second upper mold 302 can rotate on the second lower mold 301. A first mold cavity 300 is provided on the second lower mold 301. The second upper mold 302 can cover the second lower mold 301, such that the first mold cavity 300 is closed. When the second upper mold 302 is not covering the second lower mold 301, the first mold cavity 300 is open.

[0038] Keep the second upper mold 302 not covering the second lower mold 301, that is, the first mold cavity 300 is open. Pour the foamable high-density material into the first mold cavity 300 through the pouring nozzle of the pouring machine. The high-density material can preferably be a foamable PU material with a density of 0.5 - 1 g / cm3, and the foaming temperature of the foamable PU material is 50°C - 60°C, such that the high-density material fills the first mold cavity 300. Then cover the second upper mold 302 on the second lower mold 301, that is, close the first mold cavity 300. After the high-density material foams and cools and forms, a high-density lower base is obtained.

[0039] Step b: Take the second open mold 20. The second open mold 20 includes a first lower mold 201 and a first upper mold 202. One side of the first upper mold 202 is hinged to the first lower mold 201, such that this side of the first upper mold 202 can rotate on the first lower mold 201. A second mold cavity 200 is provided on the first lower mold 201. The first upper mold 202 can cover the first lower mold 201, such that the second mold cavity 200 is closed. When the first upper mold 202 is not covering the first lower mold 201, the second mold cavity 200 is open.

[0040] Keep the first upper mold 202 not covering the first lower mold 201, that is, the second mold cavity 200 is open. Place the high-density lower base into the second mold cavity 200, and a core block 400 is provided in the second mold cavity 200. Place the core block 400 on the high-density lower base. The core block 400 forms a space 500 in the second mold cavity 200. Spray the foamable medium-density material into the space 500 through the nozzle of the spraying machine. The medium-density material can preferably be a foamable PU material with a density of 0.3 - 0.5 g / cm3, and the foaming temperature of the foamable PU material is 50°C - 60°C. Make the medium-density material fill the space 500. Then cover the first upper mold 202 on the first lower mold 201, that is, close the second mold cavity 200. After the medium-density material foams and cools and forms, a semi-finished product is obtained.

[0041] Step c: Take the sealed mold 10, which includes a lower mold 101, an upper mold 102, and a stirring and pressurizing injection mechanism 103. One side of the upper mold 102 is hinged to the lower mold 101, so that this side of the upper mold 102 can rotate on the lower mold 101. A third mold cavity 100 is provided on the lower mold 101. The upper mold 102 can cover the lower mold 101 to close the third mold cavity 100, and when the upper mold 102 is not covering the lower mold 101, the third mold cavity 100 is open.

[0042] The stirring and pressurizing injection mechanism 103 includes a housing 1031 and a screw 1032. A stirring cavity is provided inside the housing 1031, and the screw 1032 is arranged in the stirring cavity. The upper mold 102 is provided with a channel, and the stirring cavity is connected to the third mold cavity 100 through the channel. The upper mold 102 is also provided with an air flow channel 1021, and the air flow channel 1021 is connected to the third mold cavity 100.

[0043] First, keep the upper mold 102 not covering the lower mold 101, that is, the third mold cavity 100 is open. Place the semi-finished product into the third mold cavity 100. Then cover the upper mold 102 on the lower mold 101 to close the third mold cavity 100. Add expandable low-density material to the stirring cavity of the stirring and pressurizing injection mechanism 103 through an external feeder. The low-density material is preferably a foaming PU material with a density of 0.14 - 0.3 g / cm 3 ³, and the foaming temperature of the foaming PU material is 50°C - 60°C. The screw 1032 can rotate to stir and pressurize the low-density material in the stirring cavity, so that the low-density material in the foaming state can be extruded into the third mold cavity 100 under high pressure. And because the low-density material is extruded under high pressure, the air in the third mold cavity 100 can be effectively extruded from the air flow channel 1021.

[0044] Make the low-density material fill the third mold cavity 100. After the low-density material foams and cools and forms, open the third mold cavity 100 to obtain a low-density high-physical-property shoe sole.

[0045] In addition, in actual production and processing, the first open mold 30, the second open mold 20, and the sealed mold 10 can be set in the same mold structure, and the corresponding upper mold or lower mold can be switched in a timely manner by relying on a manipulator or a mechanical device, so as to improve the processing efficiency.

[0046] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A low-density high-property sole, characterized in that, It includes a low-density inner lining, a medium-density side surround, and a high-density bottom. The medium-density side surround is connected to the side of the low-density inner lining and encloses the low-density inner lining. The high-density bottom is connected to both the low-density inner lining and the medium-density side surround and covers the bottom of the low-density inner lining and the medium-density side surround.

2. The low-density high-physical-property sole according to claim 1, wherein The low-density inner lining is a PU inner lining with a density of 0.14 to 0.3 g / cm 3 .

3. The low-density high-property sole according to claim 1, wherein The low-density inner lining is a PU recycled material inner lining with a density of 0.14 to 0.35 g / cm 3 .

4. The low-density high-physical-property sole according to claim 1, characterized in that, The medium-density side surround is a PU side surround with a density of 0.3 to 0.5 g / cm 3 .

5. The low-density high-physical-property sole according to claim 1, wherein The high-density bottom base is a PU bottom base with a density of 0.5 to 1 g / cm 3 .

6. The low-density high-physical-property sole according to claim 1, wherein The longitudinal thickness of the high-density bottom is 1.5 cm to 4 cm, and the transverse thickness of the medium-density side surround is 1.5 cm to 4 cm.

7. A method for manufacturing a low-density high-physical-property sole, characterized in that, It includes the following steps: Step a, take a first open mold. The first open mold is provided with a first mold cavity. Open the first mold cavity, pour a foamable high-density material into the first mold cavity so that the high-density material fills the first mold cavity. Then close the first mold cavity. After the high-density material foams and cools and forms, obtain the high-density bottom. Step b, take a second open mold. The second open mold is provided with a second mold cavity. Open the second mold cavity, place the high-density bottom into the second mold cavity, and there is a core block in the second mold cavity. Place the core block on the high-density bottom to form a space in the second mold cavity. Spray a foamable medium-density material into the space so that the medium-density material fills the space. Then close the second mold cavity. After the medium-density material foams and cools and forms, obtain a semi-finished product. Step c, take a sealed mold. The sealed mold is provided with a third mold cavity. Open the third mold cavity, place the semi-finished product into the third mold cavity. Then close the third mold cavity and inject a foamable low-density material into the third mold cavity under high pressure so that the low-density material fills the third mold cavity. After the low-density material foams and cools and forms, obtain a low-density high-physical-property shoe sole.

8. The manufacturing method of the low-density high-physical-property sole according to claim 7, characterized in that, The low-density material is a PU material with a density of 0.14 to 0.3 g / cm 3 or a recycled PU material with a density of 0.14 to 0.35 g / cm 3 The medium-density material is a PU material with a density of 0.3 to 0.5 g / cm 3 The high-density material is a PU material with a density of 0.5 to 1 g / cm 3 of PU material.

9. The manufacturing method of the low-density high-physical-property sole according to claim 8, characterized in that, The foaming temperature of the PU material is 50 °C to 60 °C.

10. The manufacturing method of the low-density high-physical-property sole according to claim 7, characterized in that, The sealed mold includes a lower mold, an upper mold, and a stirring and pressurizing injection mechanism. One side of the upper mold is hinged to the lower mold. The third mold cavity is provided on the lower mold. The stirring and pressurizing injection mechanism includes a housing and a screw. A stirring cavity is provided in the housing. The screw is provided in the stirring cavity. The stirring cavity is communicated with the third mold cavity. The upper mold is provided with an air flow channel, and the air flow channel is communicated with the third mold cavity.

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