An elastic shoe heel, its preparation process, and a shoe

Abstract

The present invention relates to the technical field of shoe materials, and specifically refers to an elastic shoe heel, its preparation process, and a shoe. The transverse cross-section of the elastic shoe heel is integrally in the shape of a C-shaped curved surface. The elastic shoe heel includes an inner surface and an outer surface, and from top to bottom, it includes an entrance part, a transition part, a receiving part, and a bottom part. The edge of the entrance part is a curved surface that slopes from the inner surface to the outer surface. The transition part is connected to the entrance part and is a curved surface that slopes from the outer surface to the inner surface direction, and the inclination degree of the inner surface of the transition part is greater than that of its outer surface and forms a stepping platform. The receiving part is a curved surface that bends towards the inner surface of the shoe heel. Curves are distributed on the outer surface of the elastic shoe heel along the transverse direction of the shoe heel. Both sides of the shoe heel also include connecting parts, which are strip-shaped structures extending from the entrance part of the shoe heel to the bottom of the shoe. The beneficial effects of the present invention are that the shoe heel is integrally formed, soft and elastic as a whole, the process is simple, and it can be used to make quickly put-on shoes, with strong applicability and popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of shoe materials, and particularly to an elastic shoe heel, a preparation process thereof, and a shoe. Background Art

[0002] The shoe mouth settings of current shoes generally include the following: 1. By setting a U-shaped opening at the shoe mouth and covering it with a tongue, and then expanding or tightening the shoe mouth through fastening components, such as shoelaces, Velcro, etc.; 2. The shoe upper is integrally formed and the shoe mouth fabric is given elasticity, such as a flyknit upper, to meet the needs of the shoe mouth expanding during putting on and taking off and tightening during wearing; 3. The opening of the shoe mouth is increased to meet the needs of the shoe mouth during putting on and taking off. This type of design is mostly seen in leather shoes and is prone to heel dropping during wearing. For shoes in the prior art, especially casual shoes or sports shoes, when wearing, it is necessary to lift the shoe heel by hand, which is very inconvenient for some people with inconvenient bending, such as the elderly or pregnant women; and with the acceleration of the pace of life, people's demand for quickly putting on shoes has gradually increased.

[0003] Based on this, currently, quickly entering shoes have also been gradually developed. For example, Patent CN112839539B discloses a quickly entering shoe with a compressible grid structure, and the compressible grid structure can bias the quickly entering shoe from an open position towards a closed position. The open position can have an expanded shoe opening to facilitate receiving the foot of an individual wearing the quickly entering shoe, while the closed position can have a smaller shoe opening to hold the foot within the quickly entering shoe. However, the shoe mechanism of this type of structure is relatively complex, has high requirements for materials and processing costs, and is not conducive to popularization. Summary of the Invention

[0004] As a first aspect of the present invention, the present invention provides an elastic shoe heel. By designing the structure of the elastic shoe heel and combining the elasticity of its material itself, when it is applied to sports shoes, casual shoes, etc., a quickly entering shoe can be obtained.

[0005] The lateral cross-section of the elastic shoe heel is integrally in the shape of a C-shaped curved surface. The elastic shoe heel includes an inner surface and an outer surface, and from top to bottom, it includes an entrance part, a transition part, a receiving part, and a bottom part. The edge of the entrance part is a curved surface that slopes from the inner surface to the outer surface. The transition part is connected to the entrance part and is a curved surface that slopes from the outer surface to the inner surface direction, and the inclination degree of the inner surface of the transition part is greater than that of the outer surface of the transition part. The inner surface of the entrance part forms a pressing platform that extends inward, so that when the foot is inserted, the pressing platform can be stepped on, and then the shoe heel is squeezed outward and downward of the shoe heel. The receiving part is a curved surface that bends toward the inner surface of the shoe heel. The outer surface of the elastic shoe heel is distributed with curves arranged horizontally along the shoe heel. Both sides of the elastic shoe heel also include connecting parts, which are strip-shaped structures extending from the entrance part of the shoe heel to the shoe bottom; and the shoe heel is integrally formed of an elastic material. The material of the elastic shoe heel includes any one of rubber foam materials, elastic PU materials, latex foam materials, sponge foam materials, PVC foam, or EVA foam materials. The elastic shoe heel is integrally compression molded by a mold.

[0006] Further, elastic fabrics are attached to the inner surface and the outer surface of the elastic shoe heel.

[0007] Further, the thickness of the transition part of the elastic shoe heel gradually decreases from the middle of the shoe heel to both sides.

[0008] Further, knitted fabrics or woven four-way stretch fabrics are attached to the inner and outer surfaces of the elastic shoe heel.

[0009] Further, the material of the elastic shoe heel includes any one of rubber foam materials, elastic PU materials, latex foam materials, sponge foam materials, PVC foam, or EVA foam materials.

[0010] Further, both sides of the elastic shoe heel also include connecting parts, which are strip-shaped structures extending from the entrance part of the shoe heel to the shoe bottom.

[0011] Further, the bottom thickness of the elastic shoe heel is 1 - 1.5 mm.

[0012] Further, the elastic shoe heel is an elastic PU material foamed by an ether-based two-component PU foaming system. The ether-based two-component PU foaming system includes a first component and a second component; the first component is a polyol mixture, and the second component is an isocyanate prepolymer. The ratio of the first component to the second component is 100 / 40 - 60.

[0013] Further, the polyol mixture includes polyol, 18 - 20 g / kg of hardener, 20 - 25 g / kg of catalyst, 9 - 13 g / kg of foaming agent, 20 - 25 g / kg of anti - yellowing agent, and 10 - 20 g / kg of foam stabilizer.

[0014] Further, the density of the elastic PU material is 0.30 - 0.35 g / cm 3 .

[0015] Further, the hardness of the elastic PU material is 30 - 40 Asker C.

[0016] Further, the first component also includes color paste.

[0017] Further, the material of the elastic shoe heel is EVA, and its main materials include ethylene - propylene - diene monomer (EPDM) and natural rubber. In addition, it also includes foaming agent, filler, cross - linker, zinc oxide, lubricant, and functional additives such as wear - resistant agent or antibacterial agent can be added when necessary; its molding process includes injection molding process, in - mold micro - foaming process, etc.

[0018] Further, the elastic shoe heel is made by mixing a rubber foam sheet composition into a blank. The rubber foam sheet is proportioned by weight as 80 - 100 parts of natural rubber, 20 - 40 parts of cis - 1,4 - polybutadiene rubber, 60 - 80 parts of talcum powder, 13 - 15 parts of zinc oxide, 10 - 20 parts of elastomer, 2 - 3 parts of yellowing resistance agent, 5 - 8 parts of antioxidant, 1 - 2 parts of accelerator D, 2 - 3 parts of sulfur, and 3 - 5 parts of foaming agent.

[0019] As the second aspect of the present invention, the present invention provides a preparation process for an elastic shoe heel, which includes the following steps:

[0020] (1) Prepare raw materials: Prepare one of the required rubber foam materials, elastic PU materials, latex foam materials, sponge foam materials, PVC foam or EVA foam materials according to needs;

[0021] (2) Molding preparation: Prepare a shoe heel mold. The shoe heel mold includes an upper mold and a lower mold. The inner surface of the lower mold is a concave surface that is consistent with the outer surface shape of the shoe heel, and the inner surface of the upper mold is a convex surface that is consistent with the inner surface shape of the shoe heel; Lay an elastic fabric on the inner surface of the lower mold;

[0022] (3) Put the solid foaming material in step (1), and close the upper mold and the lower mold for foam molding;

[0023] (4) Open the mold for demolding.

[0024] Further, when the raw material in step (1) is a liquid ether-based two-component PU foaming material, in step (2), first inject the liquid ether-based two-component PU foaming material into the lower mold, then attach an elastic fabric to the upper mold, and close the upper and lower molds for foaming and forming.

[0025] Further, the ether-based two-component PU foaming system includes a first component and a second component; the first component is a polyol mixture, and the second component is an isocyanate prepolymer. The ratio of the first component to the second component is 100 / 40 - 50.

[0026] Further, in step (1), first place the isocyanate prepolymer in an oven at 60 - 70 °C and heat for 6 - 10 hours. After melting and liquefying, transfer it to an oven at 35 - 45 °C for heat preservation; at the same time, heat the polyol in an oven at 45 - 55 °C for 6 - 10 hours, and then transfer it to an oven at 35 - 45 °C for heat preservation; then add the polyol together with 18 - 20 g / kg of hardener, 20 - 25 g / kg of catalyst, 9 - 13 g / kg of foaming agent, 20 - 25 g / kg of anti-yellowing agent, and 10 - 20 g / kg of foam stabilizer and mix and stir at 35 - 45 °C for 5 - 15 minutes to obtain the first component.

[0027] Further, mix the first component and the second component in a ratio of 100 - 40 / 60. Its emulsification time is 6 - 10 S, crosslinking time is 25 - 35 S, non-sticky time is 50 - 70 S, foaming time is 80 - 90 S, and free foaming density is 0.125 - 0.165 g / cm 3 。

[0028] Further, the molding temperature in step (3) is 40 - 55 °C, and the demolding time is 3 - 6 min.

[0029] Further, after demolding, place the shoe heel in an oven at 60 - 70 °C and bake for 8 - 12 hours.

[0030] Further, trim the edges of the obtained shoe heel to obtain the finished product.

[0031] As the third aspect of the present invention, a quick-entry shoe is proposed. The quick-entry shoe includes a shoe face part, an elastic shoe heel part, a sole, and an insole. The elastic shoe heel part is the shoe heel as described above.

[0032] Further, the shoe heel of the quick-entry shoe is stitched and connected to the shoe upper, and a webbing is stitched on the outside of the connection part to cover the stitched connection part.

[0033] Further, the insole is a pressure-reducing insole, which includes an insole body and a filling area. The insole body includes a warp-knitted air layer fabric laminated layer by layer from top to bottom. The thickness of the insole body is 6-7 mm. The filling area includes a sole filling area, a toe filling area, and a heel filling area. The material of the sole filling area is fine hair, the material of the toe filling area is coarse hair, and the material of the heel filling area is ultra-light clay particles.

[0034] Further, the thickness of the filling area is 10-12 mm.

[0035] Further, the average fineness of the fine hair is 16-18 μm, and the average fineness of the coarse hair is 62-64 μm.

[0036] As the fourth aspect of the present invention, a shoe heel mold is proposed, which includes an upper mold and a lower mold. The shoe heel mold includes an upper mold and a lower mold. The inner surface of the lower mold is a concave surface that is consistent with the outer surface shape of the shoe heel, and the inner surface of the upper mold is a convex surface that is consistent with the inner surface shape of the shoe heel. A plurality of air vents are provided on the upper mold. Exemplarily, the number of air vents is 4.

[0037] In the description of the present invention regarding orientation or direction, the transverse direction refers to the horizontal extension when using the shoe heel in a conventional manner, and the upper and lower directions refer to the upper and lower directions with respect to the vertical direction when using the shoe heel in a conventional manner; the inner surface refers to the surface close to the foot when using it in a conventional manner, and the outer surface refers to the surface far from the foot when using it in a conventional manner.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] 1. The present invention provides an elastic shoe heel. By setting the stepping platform at the entrance part, the stepping platform elastically contracts after the heel steps on it, which is convenient for the foot to slide into the shoe and prevents the top of the shoe heel from squeezing inward and affecting the wearing efficiency. Connecting the elastic shoe heel with the shoe upper can obtain a quick-entry shoe. The shoe heel can be applied to sports shoes, casual shoes, etc. The type of shoes is not restricted, and the whole shoe heel is soft and elastic, with high wearing comfort.

[0040] 2. The curves such as water ripples or waves provided on the outer surface of the shoe heel of the present invention are beneficial to absorbing elastic deformation and preventing wrinkles from occurring.

[0041] 3. The transition part on the inner surface of the shoe heel of the present invention is provided with protrusions, which play a role in preventing the shoes from falling off after being put on and ensure the stability during wearing.

[0042] 4. The manufacturing process of the shoe heel of the present invention is integrally formed, with a simple process, which is conducive to popularization and use.

[0043] 5. The heel of the present invention can be spliced with different uppers to obtain different types of shoes, and it has a wide range of uses.

[0044] 6. The insole of the quick-entry shoe of the present invention has a decompression effect, which can further improve the wearing comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic structural diagram of the shoe heel according to an embodiment of the present invention;

[0046] Figure 2 It is a schematic side cross-sectional structural diagram of the shoe heel according to an embodiment of the present invention;

[0047] Figure 3 It is a schematic rear structural diagram of the shoe heel according to an embodiment of the present invention;

[0048] Figure 4 It is a schematic top view structural diagram of the shoe heel according to an embodiment of the present invention;

[0049] Figure 5 It is a schematic bottom view structural diagram of the shoe heel according to an embodiment of the present invention;

[0050] Figure 6 It is a schematic overall structural diagram of the shoe heel according to an embodiment of the present invention;

[0051] Figure 7 It is a schematic cross-sectional structural diagram of the shoe heel according to Embodiment 2 of the present invention;

[0052] Figure 8 It is a schematic overall structural diagram of a quick-entry shoe according to an embodiment of the present invention;

[0053] Figure 9 It is a schematic closed-state structural diagram of the mold according to an embodiment of the present invention;

[0054] Figure 10 It is a schematic upper mold structural diagram of the mold according to an embodiment of the present invention;

[0055] Figure 11 It is a schematic lower mold structural diagram of the mold according to an embodiment of the present invention;

[0056] Figure 12 It is a schematic structural diagram of the insole according to an embodiment of the present invention;

[0057] Figure 13 It is a schematic partial cross-sectional structural diagram of the insole according to an embodiment of the present invention.

[0058] Inner surface 1, outer surface 2, entrance part 3, stepping platform 30, transition part 4, accommodating part 5, bottom 6, connecting part 7, elastic fabric 8, webbing 9, insole body 10, filling area 11, sole of foot filling area 110, toe filling area 111, heel filling area 112, upper mold 12, upper fastening part 121, upper convex part 122, upper mold area 123, lower mold 13, lower fastening groove 131, lower groove 132, lower mold area 133. Detailed implementation mode

[0059] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the specific implementation mode of the present invention in detail with reference to the accompanying drawings.

[0060] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar promotions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation modes disclosed below.

[0061] To make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation mode of the present invention in detail with reference to the accompanying drawings.

[0062] Embodiment 1

[0063] This embodiment proposes an elastic shoe heel. By designing the structure of the elastic shoe heel and combining the elasticity of its material itself, when it is applied to sports shoes, casual shoes, etc., a quick-entry shoe can be obtained.

[0064] As Figures 1-6 shown, the transverse cross-section of the elastic shoe heel is integrally in a C-shaped curved surface. The elastic shoe heel includes an inner surface 1 and an outer surface 2, and from top to bottom, it includes an entrance part 3, a transition part 4, an accommodating part 5 and a bottom 6. The edge of the entrance part 3 is a curved surface inclined from the inner surface 1 to the outer surface 2. The transition part 4 is connected to the entrance part 3 and is a curved surface inclined from the outer surface 2 to the inner surface 1 direction. Moreover, the inclination degree of the inner surface 1 of the transition part 4 is greater than the inclination degree of the outer surface 2 of the transition part 4. The inner surface of the entrance part 3 forms an inwardly extending stepping platform 30, so that when the foot is inserted, the stepping platform 30 can be stepped on, and then the shoe heel is squeezed outward and downward of the shoe heel. The accommodating part 5 is a curved surface bent towards the inner surface 1 of the shoe heel. The outer surface 2 of the elastic shoe heel is distributed with curves arranged horizontally along the shoe heel, and the shoe heel is integrally formed of an elastic material. The material of the elastic shoe heel includes any one of rubber foam materials, elastic PU materials, latex foam materials, sponge foam materials, PVC foam or EVA foam materials. The elastic shoe heel is integrally formed by pressing with a mold.

[0065] As a preferred solution of this embodiment, the thickness of the transition portion 4 of the elastic heel gradually decreases from the middle of the heel to the two sides. On the one hand, this structure can make the inner surface 1 of the heel fit the heel and ankle better and be more comfortable to wear. On the other hand, the two sides gradually become thinner, which can reduce the overall weight of the heel and make it lighter. Furthermore, the thickness on both sides gradually decreases, so that it can be connected to the upper part more smoothly, reducing the uneven marks caused by splicing.

[0066] As a preferred solution of this embodiment, the two sides of the elastic heel also include a connecting part 7, which is a strip structure extending from the entrance part 3 of the heel to the bottom part 6 of the shoe. The connecting part 7 is also integrally formed with the heel, and its thickness is close to or the same as the thickness of the upper to be spliced, and is smoother, which is conducive to the subsequent splicing process.

[0067] As a preferred embodiment of the present invention, the material of the elastic heel includes any one of rubber foam material, elastic PU material, latex foam material, sponge foam material, PVC foam or EVA foam material. The above materials are soft and have good resilience. They can be compressed after being subjected to force and can rebound after the external force is removed. Combined with the structure of the heel of the present embodiment, the effect of quick insertion and stable heel resistance can be achieved.

[0068] As a preferred method of this embodiment, considering the subsequent processing of the connection between the heel and the sole, the bottom 6 of the elastic heel has a thickness of 1-1.5 mm, the height of the heel is about 5-10 mm, the thickness of the bottom 6 is thin and relatively flat, and the outer surface 2 of the bottom 6 may not be provided with curved lines, so as to facilitate the subsequent gluing or sewing connection with the sole.

[0069] As a preferred mode of this embodiment, the upper edge of the entrance portion 3 decreases in height from the middle position toward both sides along the lateral direction of the heel, forming a curve with a high middle position and low sides. This structure is conducive to forming a better transition when connecting with the upper, and the overall height of the middle position is relatively high, which is more conducive to stability when worn.

[0070] The elastic heel of this embodiment is obtained by the following process:

[0071] (1) Raw material preparation: prepare one of the required rubber foam material, elastic PU material, latex foam material, sponge foam material, PVC foam or EVA foam material according to the needs;

[0072] (2) Molding preparation: prepare a shoe heel mold, which includes an upper mold and a lower mold, wherein the inner surface of the lower mold is a concave surface consistent with the shape of the outer surface of the shoe heel, and the inner surface of the upper mold is a convex surface consistent with the shape of the inner surface of the shoe heel;

[0073] (3) Place the solid foaming material in step (1), and close the upper mold and the lower mold to carry out foaming molding;

[0074] (4) Open the mold for demolding.

[0075] As a preferred method of this embodiment, the obtained shoe heel is trimmed at the edge to obtain the finished product.

[0076] Embodiment 2

[0077] This embodiment is an extended embodiment of Embodiment 1. For the convenience of subsequent connection and processing with the shoe upper, as Figure 7 shown, an elastic fabric 8 is attached to the inner surface 1 and the outer surface 2 of the elastic shoe heel. During the molding process of the shoe heel, the elastic fabric 8 is directly attached to the shoe heel by hot pressing, with good adhesion strength and no subsequent adhesion process required. The pattern or color of the attached elastic fabric 8 can be selected according to the design requirements.

[0078] As a preferred method of this embodiment, the inner and outer surfaces 2 of the elastic shoe heel are attached with knitted fabric or woven four-way stretch fabric. The fabric of the inner layer is delicate, which can also increase the skin-friendliness to the feet and further improve the comfort.

[0079] In the preparation process of the elastic shoe heel in this embodiment, the step (2) is: prepare a shoe heel mold. The shoe heel mold includes an upper mold and a lower mold. The inner surface of the lower mold is a concave surface that is consistent with the outer surface shape of the shoe heel, and the inner surface of the upper mold is a convex surface that is consistent with the inner surface shape of the shoe heel. And an elastic fabric is laid on the inner surface of the lower mold.

[0080] The foaming material in the above embodiment is any one of solid rubber foaming material, latex foaming material, sponge foaming material, PVC foaming or EVA foaming material.

[0081] Embodiment 3

[0082] This embodiment exemplarily gives a foaming material for an elastic shoe heel. Specifically, the elastic shoe heel is an elastic PU material foamed by an ether-based two-component PU foaming system. The ether-based two-component PU foaming system includes a first component and a second component; the first component is a polyol mixture, and the second component is an isocyanate prepolymer. The ratio of the first component to the second component is 100 / 40 - 60.

[0083] As a preferred method of this embodiment, the polyol mixture includes polyol, hardener 18 - 20 g / kg, catalyst 20 - 25 g / kg, foaming agent 9 - 13 g / kg, anti-yellowing agent 20 - 25 g / kg, and foam stabilizer 10 - 20 g / kg.

[0084] As a preferred embodiment of the present embodiment, the density of the elastic PU material is 0.30 - 0.35 g / cm 3 .

[0085] As a preferred embodiment of the present embodiment, the hardness of the elastic PU material is 30 - 40 Asker C.

[0086] As a preferred embodiment of the present embodiment, the first component further includes color paste.

[0087] Since the foaming material in this embodiment is liquid, the difference in its manufacturing process from the above embodiment lies in: in step (2), first inject the liquid ether-based two-component PU foaming material into the lower mold, then attach the elastic fabric to the upper mold, and close the upper and lower molds for foaming and molding.

[0088] As a preferred embodiment of the present embodiment, the ether-based two-component PU foaming system includes a first component and a second component; the first component is a polyol mixture, including the second component is an isocyanate prepolymer, and the ratio of the first component to the second component is 100 / 40 - 50.

[0089] As a preferred embodiment of the present embodiment, in step (1), first place the isocyanate prepolymer in an oven at 60 - 70 °C and heat it for 6 - 10 hours. After melting and liquefying, transfer it to an oven at 35 - 45 °C for heat preservation; at the same time, heat the polyol in an oven at 45 - 55 °C for 6 - 10 hours, and then transfer it to an oven at 35 - 45 °C for heat preservation; then add the polyol together with 18 - 20 g / kg of hardener, 20 - 25 g / kg of catalyst, 9 - 13 g / kg of foaming agent, 20 - 25 g / kg of anti-yellowing agent, and 10 - 20 g / kg of foam stabilizer and mix and stir at 35 - 45 °C for 5 - 15 minutes to obtain the first component.

[0090] As a preferred embodiment of the present embodiment, after demolding, mix the first component and the second component in a ratio of 100 - 40 / 60. Its emulsification time is 6 - 10 S, the crosslinking time is 25 - 35 S, the non-sticky time is 50 - 70 S, the foaming time is 80 - 90 S, and the free foaming density is 0.125 - 0.165 g / cm 3 .

[0091] As a preferred embodiment of the present embodiment, after demolding, the molding pressure in step (3) is 40 - 55 °C, and the demolding time is 3 - 6 min.

[0092] As a preferred embodiment of the present embodiment, after demolding, place the shoe heel in an oven at 60 - 70 °C and bake it for 8 - 12 hours to cure the obtained elastic shoe heel.

[0093] The various indicators of the shoe heel obtained in this embodiment are shown in Table 1:

[0094] Table 1 Test Results of the Shoe Heel in Embodiment 1

[0095]

[0096]

[0097] The physical properties of the elastic shoe heel in this embodiment are good, and it has good anti-compression deformation performance and moderate hardness. When used in shoes, a quickly wearable shoe can be obtained.

[0098] Embodiment 4

[0099] This embodiment provides an elastic shoe heel made of a rubber foam component. Specifically, the elastic shoe heel is kneaded into a blank by a rubber foam sheet composition. The rubber foam sheet is proportioned by weight as follows: 80-100 parts of natural rubber, 20-40 parts of cis-butadiene rubber, 60-80 parts of talcum powder, 13-15 parts of zinc oxide, 10-20 parts of elastomer, 2-3 parts of anti-yellowing agent, 5-8 parts of antioxidant, 1-2 parts of accelerator D, 2-3 parts of sulfur, and 3-5 parts of foaming agent. The test results of this elastic shoe heel are shown in Table 2.

[0100] Table 2 Test Results of the Shoe Heel in Embodiment 2

[0101]

[0102] Embodiment 4

[0103] This embodiment proposes a quickly entering shoe. As Figure 8 shown, the quickly entering shoe includes a shoe face part, a shoe heel part, and a sole. The elastic shoe heel part is the shoe heel as described above.

[0104] As a preferred method of this embodiment, the shoe heel of the quickly entering shoe is sewn and connected to the shoe upper, and a woven belt 9 is sewn on the outside of the connection part to cover the sewn connection part.

[0105] However, the connection between the shoe heel and the shoe upper is not limited to this. It can also be other methods. For example, the heel part of the shoe upper adopts a sandwich structure to include and sew and fix the elastic shoe heel, etc. Those skilled in the art can select the connection method between the elastic shoe heel and the shoe upper according to the overall design requirements of the shoe to obtain a quickly entering shoe.

[0106] Embodiment 5

[0107] This embodiment proposes a decompression insole. As Figures 12-13As shown in the figure, it includes an insole body 10 and a filling area 11. The insole body 10 includes a warp knitted air layer fabric stacked layer by layer from top to bottom. The thickness of the insole body 10 is 6-7 mm. The filling area 11 includes a sole filling area 110, a toe filling area 111, and a heel filling area 112. The material of the sole filling area 110 is fine wool, the material of the toe filling area 111 is coarse wool, and the material of the heel filling area 112 is ultra-light clay particles with a diameter of 0.8-1.2 mm. Coarse wool has poor spinnability and low utilization rate in the field of shoes and clothing. Using it as a filling material not only turns waste into treasure, but also has good support and resilience, which can play a role in support and decompression. Fine wool also has good resilience and is softer than coarse wool. The filling area 11 made of it will be relatively softer than coarse wool. Similarly, ultra-light clay particles also have good resilience and light weight. Using them in the heel filling area 11 can reduce the weight of the heel and play a role in reducing pressure.

[0108] As a preferred embodiment of this example, the thickness of the filling area 11 is 10-12 mm.

[0109] As a preferred embodiment of this example, the average fineness of the fine wool is 16-18 μm, and the average fineness of the coarse wool is 62-64 μm.

[0110] As a preferred embodiment of the present invention, the fabrics of the insole body 10 are connected by bonding or stitching.

[0111] The pressure test of the insole obtained in this example is shown in Table 2:

[0112] Table 2 Insole Pressure Test Results

[0113]

[0114] The insole of this example has a decompression effect and wearing comfort.

[0115] Example 6

[0116] This example proposes an insole with a massage function. The insole includes a sole area, an arch area, a heel area, and a toe area. The insole includes an upper surface layer and a lower surface layer from top to bottom. Among them, the upper surface layer is provided with a plurality of massage protrusions. The massage protrusions are semi-spherical. It is a skin-core structure. The hardness of its skin layer is less than that of the core layer. The hardness of its core layer is 30-35 Asker C, and the hardness of the skin layer is 45-50 Asker C. The height of the core layer is 2-2.5, and the thickness of the skin layer is 2-2.5 mm. The positions of the massage protrusions correspond to the acupoints on the sole of the foot, so it can play a massage role during walking. And because the hardness of the skin layer is relatively low, while the core layer plays a supporting role, the skin layer can also endow the insole with certain buffering and softness, improving the wearing comfort.

[0117] Example 7

[0118] This embodiment is a variant embodiment of Example 7. Its massage protrusions are made of the same material as the insole body. Specifically, the insole body 10 includes a warp-knitted air layer fabric laminated layer by layer from top to bottom. The thickness of the insole body 10 is 6-7 mm. The core layer of the massage protrusions is also a warp-knitted air layer fabric laminated layer by layer from top to bottom, and its height is 0.2-0.25 mm. The outer layer of the massage protrusions is an elastic PU material connected by adhesion. This elastic PU material can be the elastic PU material in the above embodiments, and its hardness is 35-40 Asker C. Then the manufactured insole also has a massage effect.

[0119] To add other functions to the insole, during the preparation process, far-infrared ceramic powder, graphene, or antibacterial materials can also be added to the main material of the insole or the elastic PU material to obtain corresponding functions.

[0120] Example 8

[0121] This embodiment provides a shoe heel mold, as Figures 9-11 shown, including an upper mold and a lower mold. The shoe heel mold includes an upper mold 12 and a lower mold 13. Among them, the lower mold 13 includes a lower mold area 133, and its inner surface is a concave surface that is the same as the outer surface shape of the shoe heel. In addition, the lower mold 13 also includes a lower edge groove 132 provided around the lower mold area 133 and a lower fastening groove for fastening the upper mold 12 and the lower mold 13. The upper mold 12 includes an upper mold area 123, and its inner surface is a convex surface that is the same as the inner surface shape of the shoe heel. In addition, the upper mold 12 also includes an upper edge protrusion 122 provided around the upper mold area 123, which fits with the lower edge groove 132 and is used to seal the periphery of the mold area when the upper mold 12 and the lower mold 13 are closed to prevent raw materials from overflowing. The upper mold also includes upper fastening parts 121 located at the four corners and matching with the lower fastening groove 131 for fixing the positions of the upper mold 12 and the lower mold 13 when they are closed to prevent dislocation or slippage, etc.; A number of air holes are provided on the upper mold. Exemplarily, the number of air holes is 4. The setting of the air holes is conducive to discharging the gas between the upper mold and the lower mold during the foaming process, effectively avoiding defects caused by incomplete foaming in some positions.

[0122] It should be noted that although the present invention has been described above with reference to the embodiments, various improvements can be made thereto and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention can be combined with each other in any way, and the exhaustive description of the situations of these combinations is not given in this specification only for the consideration of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An elastic shoe heel, characterized in that: The transverse cross-section of the elastic shoe heel is generally in the shape of a C-shaped curved surface as a whole. The elastic shoe heel includes an inner surface and an outer surface, and from top to bottom, it includes an entrance part, a transition part, a receiving part, and a bottom part. The edge of the entrance part is a curved surface that slopes from the inner surface to the outer surface. The transition part is connected to the entrance part and is a curved surface that slopes from the outer surface to the inner surface direction, and the inclination degree of the inner surface of the transition part is greater than that of the outer surface of the transition part. The inner surface of the entrance part forms a pressing platform that extends inwards; the receiving part is a curved surface that bends towards the inner surface of the shoe heel. The outer surface of the elastic shoe heel is distributed with curves arranged transversely along the shoe heel. Both sides of the elastic shoe heel also include connecting parts, which are strip-shaped structures extending from the entrance part of the shoe heel to the shoe bottom; and this shoe heel is integrally formed of an elastic material. The material of the elastic shoe heel includes any one of rubber foam materials, elastic PU materials, latex foam materials, sponge foam materials, PVC foam, or EVA foam materials. The elastic shoe heel is integrally compression-molded through a mold.

2. The elastic shoe heel according to claim 1, characterized in that: The elastic shoe heel is an elastic PU material foamed by an ether-based two-component PU foaming system. The ether-based two-component PU foaming system includes a first component and a second component; the first component is a polyol mixture, and the second component is an isocyanate prepolymer. The ratio of the first component to the second component is 100 / 40 - 60.

3. The elastic shoe heel according to claim 2, characterized in that: The polyol mixture includes polyol, 18 - 20 g / kg of hardener, 20 - 25 g / kg of catalyst, 9 - 13 g / kg of foaming agent, 20 - 25 g / kg of anti-yellowing agent, and 10 - 20 g / kg of foam stabilizer.

4. The elastic shoe heel according to claim 3, characterized in that: The density of the elastic PU material is 0.30 - 0.35 g / cm 3 .

5. The elastic shoe heel according to claim 3, characterized in that: The hardness of the elastic PU material is 30 - 40 Asker C.

6. The elastic shoe heel according to claim 3, characterized in that: The first component also includes color paste.

7. The preparation process of the elastic shoe heel according to any one of claims 1-6, characterized in that: It includes the following steps: (1) Configure raw materials: Configure one of the required rubber foam materials, elastic PU materials, latex foam materials, sponge foam materials, PVC foam, or EVA foam materials according to needs; (2) Mold pressing preparation: Prepare a shoe heel mold. The shoe heel mold includes an upper mold and a lower mold. The inner surface of the lower mold is a concave surface that is the same as the outer surface shape of the shoe heel, and the inner surface of the upper mold is a convex surface that is the same as the inner surface shape of the shoe heel. At the same time, the upper mold is provided with air vents for discharging gas; Lay an elastic fabric on the inner surface of the lower mold; (3) Put the solid foaming material in step (1), and close the upper mold and the lower mold for foaming and forming; (4) Open the mold for demolding.

8. The preparation process of the elastic shoe heel according to claim 7, characterized in that: When the raw material in step (1) is a liquid ether-based two-component PU foaming material, first inject the liquid ether-based two-component PU foaming material into the lower mold in step (2), then attach the elastic fabric to the upper mold, and close the upper mold and the lower mold for foaming and forming.

9. The preparation process of the elastic shoe heel according to claim 8, characterized in that: The ether-based two-component PU foaming system includes a first component and a second component; the first component is a polyol mixture, and the second component is an isocyanate prepolymer. The ratio of the first component to the second component is 100 / 40 - 50.

10. The preparation process of the elastic shoe heel according to claim 9, characterized in that: In step (1), first place the isocyanate prepolymer in an oven at 60 - 70 °C and heat for 6 - 10 hours. After melting and liquefying, transfer it to an oven at 35 - 45 °C for heat preservation; at the same time, heat the polyol in an oven at 45 - 55 °C for 6 - 10 hours, and then transfer it to an oven at 35 - 45 °C for heat preservation; then add the polyol together with 18 - 20 g / kg of hardener, 20 - 25 g / kg of catalyst, 9 - 13 g / kg of foaming agent, 20 - 25 g / kg of anti - yellowing agent, and 10 - 20 g / kg of foam stabilizer and mix and stir at 35 - 45 °C for 5 - 15 minutes to obtain the first component.

11. The preparation process of the elastic shoe heel according to claim 10, characterized in that: Mix the first component and the second component in a ratio of 100 - 40 / 60, with an emulsification time of 6 - 10S, a crosslinking time of 25 - 35S, a non-sticky time of 50 - 70S, a foaming time of 80 - 90S, and a free foaming density of 0.125 - 0.165 g / cm 3 .

12. The preparation process of the elastic shoe heel according to claim 11, characterized in that: The molding temperature in step (3) is 40 - 55 °C, and the demolding time is 3 - 6 min.

13. The preparation process of the elastic shoe heel according to claim 12, characterized in that: After demolding, place the shoe heel in an oven at 60 - 70 °C and bake for 8 - 12 hours.

14. A shoe, characterized in that: It includes a shoe face part, an elastic shoe heel part, a sole, and an insole, and the elastic shoe heel part is the elastic shoe heel as described in any one of claims 1 - 6.

Images