Double-hardness rubber-coated upper leather for heels and manufacturing process thereof

Abstract

The invention provides a double-hardness rubber-coated upper leather for heels and a manufacturing process thereof, comprising an inner-layer support body and an outer-layer soft elastomer, wherein the support body and the soft elastomer are made of the same material with different hardnesses, a surface of one end of the support body is provided with a plurality of connection columns for assembly with the heel, and the soft elastomer covers the bottom surface and the side surface of the support body by injection molding to form an integrated structure; step one: injecting a rubber-plastic material into a support body through a special mold for the support body; step two: placing the injection-molded support body into a special mold for injection molding of the soft elastomer, and through a second injection molding, covering and penetrating the soft elastomer material to form a product integrated with the support body, the upper leather processed by the process has strong structural stability, a high degree of fusion between the support body and the soft elastomer, and is not prone to delamination, and even if grease or other pollutants enter during the injection molding process, the upper leather will not delaminate.

Description

Technical Field

[0001] The invention relates to the field of shoe accessories, and in particular to a double-hardness rubber-coated upper leather for heels and a manufacturing process thereof. Background Art

[0002] The heel is one of the main stress points when walking, and is the part of the bottom of the shoe that wears faster, and plays a key role in the comfort of wearing. Therefore, the existing plastic heels of shoes, especially the heels of women's shoes, use an auxiliary accessory that contacts the ground, namely, top lift or top piece, which is generally called Toplift in English;

[0003] The upper leather of the current heels is mainly made of high-hardness rubber or other high-hardness elastomer materials, which cannot take into account the characteristics of anti-slip, quietness, high wear resistance, etc., and cannot meet the increasingly high standards of the current consumer market;

[0004] And the existing double-layer top leather, such as publication number: CN106388128A, (its manufacturing process is not conducive to mass production: 1. The appearance of the upper EVA layer and the lower PU layer is prone to unevenness, affecting the appearance of wearing; 2. The upper and lower layers of this patent are difficult to fit; 3. In the prior art, the shoe column is also made of soft material, which cannot be normally assembled with the heel, and the firmness after assembly is not high. It adopts an upper and lower double-layer structure, and the upper and lower layers are made of different materials. After casting, the upper and lower layers are not easy to blend. Delamination is easy to occur in subsequent use, and it needs to be bonded by glue, which is not conducive to environmental protection. Therefore, this patent cannot be actually applied; CN208211603U (this patented product is only suitable for small top leather within 2.5 cm in diameter of the ground), the same material is used for casting in the prior art. Although the upper and lower layers can blend, if grease or other pollutants enter during processing, the upper and lower layers cannot blend, and delamination occurs later; CN214547677 U, the upper and lower layers are made of different materials (hard plastic and soft rubber), which are not fused during injection molding. Even with edging, delamination is still prone to occur after wear during wearing. The same is true for CN201967844U and CN2757634Y. They basically adopt an upper and lower layer structure. If grease or other pollutants and debris enter during the processing, it will affect the tightness of the fusion of the upper and lower layers, and delamination is likely to occur. Summary of the invention

[0005] In view of the deficiencies in the existing technology, the present invention provides a double-hardness rubber-coated upper leather for heels and a manufacturing process thereof.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a double-hardness rubber-coated leather for heels, including an inner support body and an outer soft elastomer, the support body and the soft elastomer are made of the same material with different hardness, and the surface of one end of the support body has a plurality of connecting columns for assembling with the heel, and the soft elastomer is coated with the bottom surface and side circumference of the support body by injection molding and interlaced and bitten into an integrated structure.

[0007] The surface of the support body which at least partially contacts with the soft elastic body has a plurality of through holes.

[0008] The through hole is located on one end surface of the support body provided with a connecting column, and the through hole diameter is larger than the through hole diameter on the other end surface. The through hole is a stepped hole or a tapered hole.

[0009] The outer edge of the support body has a serrated edge.

[0010] The outer edge of the support body has two layers of sawtooth surrounding edges, and the sawteeth of the upper and lower layers of sawtooth surrounding edges are arranged alternately.

[0011] A process for producing a rubber-coated top cover, the process comprising the following steps:

[0012] Step 1: Injection molding the rubber-plastic material into a support body through a special mold for the support body;

[0013] Step 2: placing the injection molded support body into a special mold for the soft elastomer of the second injection molding, and overmolding the soft elastomer through the secondary injection molding and combining it with the support body to form an integrated product;

[0014] In step 1, the support body is made of a rubber-plastic material with a Shore hardness of 90A or above or a Shore hardness of 60D or above.

[0015] The soft elastomer encapsulation in step 2 is made of a rubber-plastic material with a Shore hardness of 78A to 50A.

[0016] The rubber-plastic material is TPU.

[0017] The injection molding temperature of the support body in step 1 is between 180 degrees Celsius and 280 degrees Celsius; the injection molding temperature of the soft elastomer in step 2 is between 150 degrees Celsius and 185 degrees Celsius.

[0018] The beneficial effects of the present invention are as follows: the present invention provides a double-hardness rubber-coated upper leather for heels and a manufacturing process thereof; the upper leather manufactured by the process has strong structural stability, a high degree of fusion between a support body and a soft elastomer, and is not prone to delamination; and a special injection molding process and structure are adopted, so even if grease or other pollutants enter during the injection molding process, delamination of the upper leather will not occur; the product adopts environmentally friendly materials, and does not require additional glue for bonding in the manufacturing process, which is beneficial to environmental protection; the upper leather manufactured by the present process has both the firmness and ease of use of a hard elastomer and the high anti-slip, shock-resistant, quiet, and high wear-resistant properties of a soft elastomer outer layer and a floor layer.

[0019] The invention also has the characteristics of simple structure, convenient processing and easy assembly, and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the support structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention. DETAILED DESCRIPTION

[0023] like Figure 1-3 As shown in the figure, a double-hardness rubber-coated upper leather for heels includes an inner support body 100 and an outer soft elastic body 200. The support body 100 and the soft elastic body 200 are made of the same material with different hardness. The surface of one end of the support body 100 has a plurality of connecting columns 110 for assembling with the heel. The soft elastic body 200 is coated with the bottom and side surfaces of the support body 100 by injection molding and presents an integrated structure. The support body 100 and the elastic body are made of the same material with different hardness. The soft material 200 can effectively ensure that the two are highly integrated during injection molding to avoid delamination. The connecting column 110 is used to connect and fix the top leather and the bottom of the heel. The connecting column 110 and the support body 100 are integrally injection molded. The soft elastomer 200 in this embodiment adopts an injection molding method in which the bottom and side surfaces cover the support body 100, so that the bottom and side surfaces of the soft elastomer 200 are integrated with the support body 100 after injection molding, so that the two are more firmly fixed after injection molding and are not easy to delaminate.

[0024] The support body 100 has a plurality of through holes 120 on its surface which is at least partially in contact with the soft elastomer 200. The purpose of providing the through holes 120 on the support body 100 is to facilitate the injection material to enter the through holes 120 during the injection molding of the soft elastomer 200. After cooling, the soft elastomer 200 is formed and fused with the support body 100 as a whole. By providing the through holes 120, the contact area between the elastomer 200 and the support body 100 is increased, thereby improving the fusion effect and the firmness after fusion.

[0025] The through hole 120 is located on the surface of one end of the support body 100 where the connecting column 110 is provided, and the aperture of the through hole 120 is larger than the aperture of the through hole 120 on the other end surface. The through hole 120 is a stepped hole or a tapered hole. In this embodiment, a stepped hole with a larger aperture at the top and a smaller aperture at the bottom is used. The purpose of using the stepped hole or the tapered hole is to further improve the fusion firmness of the soft elastomer 200 and the support body 100. Even if grease or other contaminants enter during the injection molding process, making the fusion degree of the soft elastomer 200 and the support body 100 not high, the soft elastomer 200 and the support body 100 will not directly delaminate and separate.

[0026] The outer edge of the support body 100 has a serrated edge 130 , which is provided to increase the contact area between the support body 100 and the soft elastomer 200 , so that the soft elastomer 200 is more firmly connected and fused with the support body 100 during secondary injection molding.

[0027] The outer edge of the support body 100 has two layers of serrated edges 130, and the serrations of the upper and lower layers of serrated edges 130 are staggered. The purpose of setting the upper and lower layers of serrated edges 130 is to allow the support body 100 and the soft elastic body 200 to bite each other, thereby further improving the fusion and firmness.

[0028] A process for making a rubber-coated top cover, the process comprising the following steps; Step 1: Injection-molding a rubber-plastic material into a support body 100 through a support body-specific mold; the support body-specific mold in this step is determined according to actual needs and shape, and the mold structure is simple, and will not bring difficult-to-overcome technical difficulties to technical personnel in this field, so it is not too limited. Step 2: Place the injection-molded support body 100 into a soft elastomer secondary injection molding special mold, and inject the elastomer material into an elastomer 200 through the soft elastomer secondary injection molding special mold and combine it with the support body to form an integrated product; the soft elastomer secondary injection molding special mold in this step is the same as the support body-specific mold, both are determined according to actual needs, and both are conventional ordinary molds, and the difficulty of opening the mold is not high, so it will not be described in detail.

[0029] In step 1, the support body 100 is made of a rubber-plastic material with a Shore hardness of 90A (or Shore hardness of 60D) or above, preferably TPU. Because the support body 100 supports and connects the heel, its material must have both a certain toughness to resist impact and a hardness to support it.

[0030] The injection molding temperature of the support body 100 in step 1 is between 170 degrees Celsius and 280 degrees Celsius. In this embodiment, the injection molding temperature of step 1 is preferably 215 degrees Celsius.

[0031] In step 2, the soft elastic body 200 is made of a rubber-plastic elastic body material with a Shore hardness of 78A to 50A, preferably TPU.

[0032] Since the soft elastic body 200 needs to meet the requirements of anti-skid, quietness, wear resistance, etc., it is made of a soft elastic material with low hardness and high wear resistance.

[0033] The injection molding temperature of the soft elastic body 200 in step 2 is between 150 degrees Celsius and 185 degrees Celsius, and the injection molding temperature in step 2 is preferably 185 degrees Celsius.

[0034] The TPU material in this embodiment is thermoplastic polyurethane elastomer rubber, which is an environmentally friendly new elastomer material.

[0035] In this embodiment, the injection molding process is adopted, which is simpler and more practical than the casting or infusion process. The product after injection molding has a more beautiful appearance and higher precision and fit.

[0036] The present invention provides a double-hardness rubber-coated upper leather for heels and a manufacturing process thereof. The upper leather processed by the process has strong structural stability, a high degree of fusion between a support body and an elastomer, is not prone to delamination, and adopts a special injection molding process and structure, so that even if grease or other pollutants enter during the injection molding process, the upper leather will not delaminate; the upper leather manufactured by the process has both the firmness and ease of use of a hard elastomer and the high anti-slip, shock-resistant, quiet, and high wear-resistant properties of a soft elastomer outer layer and a ground layer.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, simple changes and substitutions by ordinary technicians in the field are within the protection scope of the present invention.

Claims

1. A double-hardness rubber-coated upper leather for heels, characterized in that: It comprises an inner support body and an outer soft elastic body, wherein the support body and the soft elastic body are made of the same material with different hardness, a surface of one end of the support body is provided with a plurality of connecting posts for assembling with the heel, and the soft elastic body is coated with the bottom surface and the side periphery of the support body by injection molding and interlaced and bitten into an integrated structure; The surface of the support body that at least partially contacts the soft elastic body has a plurality of through holes; the through holes on the surface of one end of the support body provided with the connecting column have a larger aperture than the through holes on the surface of the other end, and the through holes are step holes; The outer edge of the support body has a serrated edge; the outer edge of the support body has two layers of serrated edges, and the serrations of the upper and lower layers of serrated edges are staggered; The production process of the rubber-coated top cover includes the following steps: Step 1: Injection molding the TPU material into a support body through a special mold for the support body; Step 2: Place the injection molded support body into a special mold for the soft elastomer of the second injection molding, and overmold the soft elastomer through the secondary injection molding and combine it with the support body to form an integrated product.

2. The double-hardness rubber-covered upper leather for heels as claimed in claim 1, characterized in that: In step 1, the support body is made of a rubber-plastic material with a Shore hardness of 90A or above or a Shore hardness of 60D or above.

3. The double-hardness rubber-covered upper leather for heels as claimed in claim 1, characterized in that: The soft elastomer encapsulation in step 2 is made of a rubber-plastic material with a Shore hardness of 78A to 50A.

4. A double-hardness rubber-covered upper leather for heels as claimed in claim 2 or 3, characterized in that: The injection molding temperature of the support body in step 1 is between 180 degrees Celsius and 280 degrees Celsius; the injection molding temperature of the soft elastomer in step 2 is between 150 degrees Celsius and 185 degrees Celsius.

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