Multi-layer polyurethane sole and manufacturing method

Abstract

The invention provides a multi-layer polyurethane shoe sole and a manufacturing method, the multi-layer polyurethane shoe sole comprises a shoe sole base layer, a protruding layer integrally formed on one side of the shoe sole base layer and a connecting layer arranged on the other side of the shoe sole base layer, and the shoe sole base layer and the protruding layer are polyurethane layers. Therefore, the attractiveness and the functionality of the sole are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of soles, in particular to a multi-layer polyurethane sole and a manufacturing method thereof. Background Art

[0002] Polyurethane (PU) has a wide range of applications, including coatings, adhesives, fabric finishing agents, leather modifiers, polyurethane soft / rigid foams, elastomers, etc. It is used in the fields of textiles, construction, aviation, shipping, transportation, medicine, electronics, and shoemaking. Polyurethane is divided into one-component and two-component. One-component polyurethane is easy to use, but its physical properties are not as good as those of two-component polyurethane, and it is only suitable for simple application environments. Therefore, shoe soles are generally made of two-component polyurethane.

[0003] Compared with ordinary rubber soles, polyurethane soles have the characteristics of light weight and good wear resistance. They solve the problems of rubber soles easily breaking and debonding, and are durable. However, when the two-component polyurethane is prepared, it will begin to react and cure at room temperature and gradually harden. This also leads to insufficient time for the production of soles. Two-component polyurethanes of different hardness or color are injected into the small grooves of the mold, and the soles cannot be manufactured in layers, which greatly affects the aesthetics and functionality of the polyurethane soles. Summary of the invention

[0004] Therefore, in view of the above problems, the present invention provides a multi-layer polyurethane sole and a manufacturing method thereof.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is to provide a multi-layer polyurethane sole, including a sole base layer, a raised layer integrally formed on one side of the sole base layer, and a connecting layer arranged on the other side of the sole base layer, wherein the sole base layer and the raised layer are both polyurethane layers.

[0006] A further improvement is that the base layer of the sole and the raised layer have different hardnesses.

[0007] A further improvement is that the connecting layer is a connecting cloth or a polyurethane layer.

[0008] A method for manufacturing a multi-layer polyurethane sole comprises the following steps: S1. Pour any two-component polyurethane adhesive into the concave mold, cover it with a convex mold, and perform the first hot pressing curing; S2, removing the convex mold, removing the two-component polyurethane rubber material pushed out by the convex mold, obtaining a convex layer, and then pouring another two-component polyurethane rubber material into the concave mold; S3, placing the release paper cover on the concave mold, and performing a second hot pressing curing to obtain a multi-layer polyurethane sole.

[0009] A further improvement is that the die comprises: a die main body, a plurality of first grooves provided on the die for forming the base layer of the sole, and a plurality of second grooves provided on the first grooves for forming the raised layer; the male die comprises: a male die main body, and a plurality of protrusions provided on the male die main body for abutting against the circumference of the second grooves to cut off the connection of the rubber, wherein the protrusions match the height of the first grooves.

[0010] A further improvement is that: a third groove for storing residual material is provided on the male mold body at the peripheral side of the protrusion.

[0011] A further improvement is that the concave mold is made of elastic material, and the convex mold is made of hard material.

[0012] A further improvement is that: a plurality of positioning posts are arranged on the female mold body, and positioning holes corresponding to the positioning posts are arranged on the male mold body.

[0013] A further improvement is that the second protrusion is 0.2-0.8 mm larger than the aperture of the second groove.

[0014] A further improvement is that in the steps S1 and S2, during the process of pouring the two-component polyurethane adhesive into the concave mold, the concave mold needs to be repeatedly evacuated to remove air bubbles.

[0015] A further improvement is that in the steps S1 and S2, after the two-component polyurethane adhesive is poured into the concave mold, the excess two-component polyurethane adhesive needs to be scraped off.

[0016] Further improvement is that: the first hot pressing, the hot pressing temperature is: 50-80 ° C, the hot pressing time is: 5-15 minutes, the hot pressing pressure is: 2-3kg.

[0017] A further improvement is that in the step S3, before covering with release paper, it is also necessary to remove the residual two-component polyurethane adhesive adhering to the surface of the die to improve the flatness of the surface of the die.

[0018] A further improvement is that in step S3, a connecting cloth may be placed on the concave mold before the release paper is placed, so as to facilitate installation of the sole on the shoe.

[0019] A further improvement is that in step S3, before covering with release paper, two-component polyurethane adhesive of different components can be poured into the concave mold again, so as to facilitate the installation of the sole on the shoe. After pouring, it needs to be left to stand for 7-8 minutes before covering with release paper.

[0020] A further improvement is that in step S3, foam is required to be placed on the release paper before the second hot pressing.

[0021] A further improvement is that in the step S3, before the connection cloth is covered, the concave mold filled with two-component polyurethane adhesive needs to be left to stand for 7-8 minutes.

[0022] A further improvement is that in step S3, before pouring the two-component polyurethane adhesive again, the concave mold poured with the two-component polyurethane adhesive needs to be left to stand for 7-8 minutes.

[0023] A further improvement is that in step S3, the second hot pressing is performed at a temperature of 60°C, a time of 15-40 minutes, and a pressure of 2-3 kg.

[0024] A further improvement is that the concave mold is a TPE mold or a TPR mold.

[0025] The advantages and beneficial effects of the present invention are: 1. It has strong functionality and high aesthetics, which makes it easy for manufacturers to adjust the composition and color of the two-component polyurethane rubber between the base layer and the raised layer of the sole according to the actual needs of consumers, so as to make the sole lighter, more non-slip and more beautiful.

[0026] 2. The rubber material is cut off by the counteraction between the concave die and the convex die, so as to manufacture the sole in stages and in layers. The operation steps are simple and easy to understand. Compared with the traditional production method, there is only one more convex die for ejecting the cut rubber material. It is easy to combine with the existing production method and has wide applicability.

[0027] 3. The concave mold is made of TPE or TPR, which is elastic and will not damage the convex mold. It is also repellent to the polyurethane material, which can reduce the process of spraying the release agent, reduce the operation time in the production process, improve the success rate of layered manufacturing of polyurethane soles, increase production speed, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic top view of a multi-layer polyurethane sole and a manufacturing method of the sole of the present invention; Figure 2 A schematic top view of a concave mold of a multi-layer polyurethane sole and a manufacturing method of the present invention; Figure 3 A schematic top view of a multi-layer polyurethane sole and a male mold of a manufacturing method of the present invention; Figure 4 A schematic cross-sectional view of a multi-layer polyurethane sole and a manufacturing method of the present invention, in which a rubber material is poured into a concave mold; Figure 5 It is a cross-sectional schematic diagram of a multi-layer polyurethane sole and a manufacturing method of the present invention, showing a mold-matching state of a concave mold and a convex mold; In the figure: 101, sole base layer; 102, raised layer; 103, connecting layer; 104, concave mold body; 105, first groove; 106, second groove; 107, convex mold body; 108, bump; 109, third groove; 110, positioning column; 111, positioning hole; 112, rounded corner. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0030] like Figure 1-Figure 5 As shown, a multi-layer polyurethane sole includes a sole base layer 101, a raised layer 102 integrally formed and arranged on one side of the sole base layer 101, and a connecting cloth arranged on the other side of the sole base layer 101, wherein the sole base layer 101 and the raised layer 102 are both polyurethane layers.

[0031] In order to enhance the functionality of the sole, the sole base layer 101 and the protruding layer 102 have different hardnesses.

[0032] In order to enhance the aesthetics of the sole, the sole base layer 101 and the raised layer 102 have different colors.

[0033] In order to facilitate connection with shoes and to be able to be selected according to actual needs of users, the connection layer 103 is a connection cloth or a polyurethane layer.

[0034] A method for manufacturing a multi-layer polyurethane sole comprises the following steps: S1. Pour any two-component polyurethane adhesive into the concave mold, cover it with a convex mold, and perform the first hot pressing curing; S2, removing the convex mold, removing the two-component polyurethane adhesive material pushed out by the convex mold, obtaining the protruding layer 102, and pouring another two-component polyurethane adhesive material into the concave mold; S3, placing the release paper cover on the concave mold, and performing a second hot pressing curing to obtain a multi-layer polyurethane sole.

[0035] In order to make it possible to seal the second groove 106 after the convex mold cover is installed, and to cut off the connection between the rubber in the second groove 106 and the rubber outside the second groove 106, thereby facilitating the removal of excess rubber, the die comprises: a die body 104, a plurality of first grooves 105 opened on the die for forming the sole base layer 101, and a plurality of second grooves 106 opened on the first groove 105 for forming the raised layer 102; the convex mold comprises: a convex mold body 107, and a plurality of protrusions 108 arranged on the convex mold body 107 for abutting against the circumference of the second groove 106 to cut off the connection of the rubber, and the protrusions 108 are matched in height with the first grooves 105.

[0036] In order to ensure that the ejected rubber material has sufficient space to be stored without overflowing out of the mold or pushing toward the concave mold, a third groove 109 for storing excess material is provided on the male mold body 107 around the protrusion 108 .

[0037] In order to prevent damage to the male mold, the female mold is made of elastic material and the male mold is made of hard material; The concave mold body is a TPE / TPR mold, which repel each other with polyurethane and will not stick together, so it can be demoulded naturally without spraying a release agent, further simplifying the production process; The male mold body is a metal mold, thereby ensuring its stability under high temperature and high pressure.

[0038] In order to facilitate the rapid installation of the punch and prevent the displacement of the die and the punch during hot pressing, a plurality of positioning posts 110 are provided on the die body 104, and positioning holes 111 corresponding to the positioning posts 110 are provided on the punch body 107. The positioning posts 110 are provided with rounded corners 112 for alignment with the positioning holes 111.

[0039] In order to facilitate cutting off the connection between the rubber material in the second groove 106 and the rubber material outside the second groove 106 , the second protrusion 108 is 0.2-0.8 mm larger than the aperture of the second groove 106 .

[0040] In order to improve the quality and aesthetics of the sole and prevent bubbles from existing in the sole, in the steps S1 and S2, the mold needs to be repeatedly evacuated during the process of pouring the two-component polyurethane adhesive into the mold to remove bubbles.

[0041] In order to reduce glue overflow and facilitate the setting of the male mold, the connection cloth and the re-injection of the two-component polyurethane glue, in the steps S1 and S2, the excess two-component polyurethane glue needs to be scraped off after the two-component polyurethane glue is poured into the female mold.

[0042] In order to form the raised layer 102, the first hot pressing is performed at a temperature of 50-80°C, a time of 5-15 minutes, and a pressure of 2-3 kg.

[0043] In order to further improve the flatness of the surface of the die, facilitate the covering of the connecting cloth and the re-injection of the two-component polyurethane adhesive, and improve the quality of the sole after molding, in the step S3, before covering with the release paper, it is also necessary to remove the residual two-component polyurethane adhesive adhering to the surface side of the die to improve the flatness of the surface side of the die.

[0044] In order to facilitate the connection between the sole and the shoe, in the step S3, a connecting cloth can be covered on the concave mold before covering with the release paper, so as to facilitate the installation of the sole on the shoe.

[0045] In order to further enhance the aesthetics of the shoes and facilitate the connection of the soles to the shoes, in the step S3, two-component polyurethane adhesive of different components can be poured once more on the die before covering with release paper, thereby forming a complete polyurethane layer, which makes it easier to install the soles on the shoes. After pouring, it needs to be left to stand for 7-8 minutes before covering with release paper.

[0046] In order to increase the contact area between the polyurethane adhesive and the connecting layer 103 and enhance the connection strength, in the step S3, foam is required to be placed on the release paper before the second hot pressing.

[0047] In order to prevent the two-component polyurethane adhesive from overflowing to the other side of the connecting cloth in large quantities, affecting the aesthetics of the sole and affecting the combination of the sole and the shoe, in the step S3, the concave mold filled with the two-component polyurethane adhesive needs to be left to stand for 7-8 minutes before covering the connecting cloth.

[0048] In order to prevent the two-component polyurethane adhesive from mixing colors and affecting the appearance, in the step S3, the concave mold filled with the two-component polyurethane adhesive needs to be left to stand for 7-8 minutes before pouring the two-component polyurethane adhesive again.

[0049] In order to form the sole, in step S3, the second hot pressing is performed, the hot pressing temperature is 60° C., the hot pressing time is 15-40 minutes, and the hot pressing pressure is 2-3 kg.

[0050] Working principle: During production, the prepared two-component polyurethane adhesive is first poured into the first groove 105 and the second groove 106 of the concave mold in batches. During the batch pouring process, the concave mold is vacuumed to remove the bubbles in the adhesive. After the pouring is completed, the excess adhesive is scraped off to ensure the flatness of the concave mold. At this time, the upper convex mold can be covered for hot pressing and curing; After the male mold cover is installed, the protrusion 108 abuts against the junction of the first groove 105 and the second groove 106, thereby cutting off the connection between the rubber material in the second groove 106 and the rubber material outside the second groove 106, and a third groove 109 is opened between the protrusion 108 and the male mold body 107, which is used to store the rubber material ejected from the first groove 105, so as to prevent the rubber material from overflowing outside the mold; After the first hot pressing curing is completed, the excess glue can be removed, and two-component polyurethane glue with different components can be poured into the concave mold. After standing until the two-component polyurethane glue is slightly solidified, it is covered with a connecting cloth or two-component polyurethane glue with different components is poured again, and then hot pressing curing is performed for the second time, and a multi-layer polyurethane sole with different components can be obtained.

[0051] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. A multi-layer polyurethane sole, characterized in that: The shoe sole base layer comprises a convex layer which is integrally formed and arranged on one side of the shoe sole base layer, and a connecting layer which is arranged on the other side of the shoe sole base layer. The shoe sole base layer and the convex layer are both polyurethane layers.

2. A multilayer polyurethane according to claim 1, characterized in that: The base layer and the raised layer of the sole have different hardness.

3. A multilayer polyurethane according to claim 1, characterized in that: The connecting layer is a connecting cloth or a polyurethane layer.

4. A method for manufacturing a multi-layer polyurethane sole, characterized in that: The steps include: S1. Pour any two-component polyurethane adhesive into the concave mold, cover it with a convex mold, and perform the first hot pressing curing; S2, removing the convex mold, removing the two-component polyurethane rubber material pushed out by the convex mold, obtaining a convex layer, and then pouring another two-component polyurethane rubber material into the concave mold; S3, placing the release paper cover on the concave mold, and performing a second hot pressing curing to obtain a multi-layer polyurethane sole.

5. The method for manufacturing a multi-layer polyurethane sole according to claim 4, characterized in that: The concave mold includes: a concave mold body, a plurality of first grooves opened on the concave mold for forming the sole base layer, and a plurality of second grooves opened on the first grooves for forming the raised layer; the convex mold includes: a convex mold body, and a plurality of protrusions arranged on the convex mold body for abutting against the peripheral sides of the second grooves to cut off the rubber connection, and the protrusions match the height of the first grooves.

6. The method for manufacturing a multi-layer polyurethane sole according to claim 5, characterized in that: The male mold body is also provided with a third groove around the convex block for storing the residual material.

7. The method for manufacturing a multi-layer polyurethane sole according to claim 5, characterized in that: The concave mold is made of elastic material, and the convex mold is made of hard material.

8. The method for manufacturing a multi-layer polyurethane sole according to claim 5, characterized in that: The female mold body is provided with a plurality of positioning posts, and the male mold body is provided with positioning holes corresponding to the positioning posts.

9. The method for manufacturing a multi-layer polyurethane sole according to claim 5, characterized in that: The second protrusion is 0.2-0.8 mm larger than the aperture of the second groove.

10. The method for manufacturing a multi-layer polyurethane sole according to claim 4, characterized in that: In the steps S1 and S2, during the process of pouring the two-component polyurethane adhesive into the concave mold, the concave mold needs to be repeatedly evacuated to remove bubbles.

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