Low-cost shoe material production method

Abstract

A low-cost shoe material production method, which comprises: putting recycled EVA leftover materials into a shoe material cavity of a steam forming mold, controlling the steam forming mold to close, and directly introducing steam into the shoe material cavity of the steam forming mold to perform heating so as to bond the EVA leftover materials in the shoe material cavity together, wherein the steam forming pressure is 1.97 MPa to 2.03 MPa, the temperature of the steam is 195ºC to 255ºC, and the heating time of the steam is 350 s to 450 s.

Description

A low-cost shoe material production method Technical Field

[0001] The present invention relates to the technical field of shoe materials, and in particular to a low-cost shoe material production method. Background Art

[0002] EVA (EVA is the abbreviation of ethylene-vinyl acetate copolymer, which is a thermoplastic elastomer) is a common material for producing popcorn shoe materials; when EVA molded sheets are made into soles and other products, it is inevitable that EVA scraps will be produced.

[0003] Because EVA scraps are a waste material that has been foamed and molded, recycling them requires heat-melting them and remaking them into popcorn material. However, this approach presents the following challenges: a complex recycling process and high recycling costs. In light of these issues, the inventors of this case conducted in-depth research, leading to the present case. Technical issues

[0004] The technical problem to be solved by the present invention is to provide a low-cost shoe material production method, which can directly utilize EVA scraps to produce shoe materials and reduce the recycling cost of the EVA scraps. Technical Solutions

[0005] The present invention is achieved by: a low-cost shoe material production method, the production method comprising:

[0006] The recycled EVA scraps are filled into the shoe material cavity of the steam forming mold, the steam forming mold is controlled to be closed, and steam is directly introduced into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material; wherein, the steam forming pressure is 1.97MPA-2.03MPA, the steam temperature is 195℃-255℃, and the steam heating time is 350S-450S.

[0007] Furthermore, the steam molding pressure is 2.00 MPA.

[0008] Furthermore, the temperature of the steam is 225°C.

[0009] Furthermore, the steam heating time is 400S.

[0010] Furthermore, the steam forming mold includes an upper mold and a lower mold, and a shoe material cavity is formed between the upper mold and the lower mold when the mold is closed; the cavity wall of the shoe material cavity is distributed with air holes, and each of the air holes is connected to the steam generating device through an air pipe. Beneficial effects

[0011] By adopting the technical solution of the present invention, at least the following beneficial effects are achieved:

[0012] 1. The recycled EVA scraps are filled into the shoe material cavity of the steam forming mold and directly heated and formed using steam. Compared with hot melting the EVA scraps and remaking them into popcorn materials, the recycling process is simple and can effectively reduce the recycling cost of EVA scraps.

[0013] 2. The production process of the present invention can directly use 100% EVA scraps to produce shoe materials, and the performance of the produced shoe materials can be close to the level of original EVA, and the quality of the shoe materials after molding can be guaranteed; at the same time, the molding process mainly controls the parameters of steam to make adjacent EVA scraps reliably bond together without using adhesives such as AB glue, which is environmentally friendly.

[0014] 3. After molding, the surface of the shoe material can form irregular patterns, which can enrich the style of the shoe material. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] FIG1 is a perspective view of a steam forming mold according to the present invention;

[0017] FIG2 is a schematic diagram of the principle of the steam forming mold of the present invention;

[0018] FIG3 is a schematic structural diagram of the shoe material after molding according to the present invention.

[0019] Description of reference numerals:

[0020] Steam forming mold 100, upper mold 102, lower mold 103;

[0021] Shoe materials 200. Best Mode for Carrying Out the Invention

[0022] In order to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] 1 to 3 , a low-cost method for producing shoe materials according to the present invention is shown. The method comprises:

[0024] Recycled EVA scraps are filled into the shoe material cavity 101 of the steam forming mold 100, the steam forming mold 100 is controlled to close, and steam is directly introduced into the shoe material cavity 101 of the steam forming mold 100 to heat the shoe material, so that the EVA scraps in the shoe material cavity 101 are bonded together to form the shoe material 200; wherein the steam forming pressure is 1.97MPA-2.03MPA, the steam temperature is 195°C-255°C, and the steam heating time is 350s-450s. In a specific embodiment of the present invention, the shoe material 200 is a sole, an insole, or a sheet.

[0025] The steam forming mold 100 includes an upper mold 102 and a lower mold 103. When the molds are closed, a shoe material cavity 101 is formed between the upper mold 102 and the lower mold 103. The cavity wall of the shoe material cavity 101 is evenly distributed with air holes (not shown in the figure), and each of the air holes is connected to a steam generating device (not shown in the figure) through an air pipe, so that when in operation, the steam generating device can directly introduce steam into the shoe material cavity 101, thereby achieving heating and forming of the block particles filled in the shoe material cavity 101. In the specific implementation of the present invention, the cavity wall of the shoe material cavity 101 is covered with air holes, and each air hole is evenly distributed on the cavity wall of the shoe material cavity 101, which can ensure that each position of the shoe material cavity 101 is heated evenly, so that the block particles in the shoe material cavity 101 are evenly heated, and ensure that adjacent block particles can be reliably bonded together.

[0026] In the specific implementation of the present invention, before the recycled EVA scraps are filled into the shoe material cavity 101 of the steam forming mold 100, the following further includes: cutting the recycled EVA scraps into block particles. Since the steam forming mold 100 is used to directly hot-press the cut block particles into the shoe material 200, the specifications of the block particles are very high. If the size of the block particles is too large, the block particles will expand when forming in the steam forming mold 100, resulting in the molded shoe material not being easy to cool, which will prolong the entire production time and the shoe material may have holes after forming; and if the size of the block particles is too large, the block particles will expand when forming in the steam forming mold 100, which will cause the molded shoe material to be difficult to cool, which will prolong the entire production time and the shoe material may have holes after forming; and if The size of the block particles is too small, and the block particles will have a poor supporting effect in the steam forming mold 100. The relative density of the shoe material after molding will be high, which will cause the molded shoe material to be hard. For this reason, in the present invention, the length of the block particles is 2cm-3cm, the width is 1cm-2cm, and the height is 1cm-2cm. By adopting block particles of the above specifications, the molded shoe material is relatively easy to be cooled, which helps to reduce production time and improve production efficiency. The shoe material after molding will not have holes, the relative density of the shoe material is moderate, and the shoe material will not be hard, which can ensure the quality of the molded shoe material 200. At the same time, after the recycled EVA scraps are cut into block particles, it is also necessary to weigh the cut EVA scraps according to the weight required for the shoe material, and fill the weighed EVA scraps into the shoe material cavity 101 of the steam forming mold 100 to ensure that the shoe material after molding will not be too light or too heavy.

[0027] In order to achieve direct recycling of EVA scraps, the present invention proposes for the first time to fill the recycled EVA scraps into the shoe material cavity 101 of the steam forming mold 100 and directly use steam to heat and shape them, thereby reducing the cost of recycling EVA scraps. In order to achieve direct steam heating and shaping of EVA scraps, the present invention has strict requirements on the steam forming pressure, steam temperature and steam heating time. If the steam forming pressure is too high, the EVA scraps (i.e., the block particles after cutting) will melt, while if the steam forming pressure is too low, the bonding effect between the EVA scraps will be relatively poor; if the steam temperature is too high, the EVA scraps will also melt, while if the steam temperature is too low, the bonding effect between the EVA scraps will be relatively poor; if the steam heating time is too long, steam will be wasted and will not be conducive to improving production efficiency, while if the steam heating time is too short, the bonding effect between the EVA scraps will be relatively poor. The present invention sets the steam molding pressure to 1.97MPA-2.03MPA, the steam temperature to 195℃-255℃, and the steam heating time to 350S-450S. By adopting the above steam parameters, it can be ensured that the EVA scraps will not melt, and the EVA scraps can be reliably bonded together, ensuring that the molded shoe material 200 will not break during use, so that the performance of the produced shoe material can be close to the level of original EVA; preferably, the steam molding pressure is 2.00MPA, the steam heating time is 400S, and the steam temperature is 225℃.

[0028] In the present invention, the production method further includes: after the shoe material 200 is formed, the steam is turned off and the formed shoe material 200 is cooled, and the cooling time is 240S-320S. Because when cooling is specifically performed, if the cooling time is too short, the EVA scraps (i.e., the block particles after cutting) will expand, and the shaping effect will be poor; and if the cooling time is too long, the production time will be pulled out, which is not conducive to improving production efficiency. The present invention sets the cooling time to 240S-320S, which can ensure that the EVA scraps after forming will not cause poor shaping effect due to expansion, and also helps to improve production efficiency. In addition, when cooling the formed shoe material 200, after turning off the steam, cooling water can be introduced into the shoe material cavity 101 of the steam forming mold 100 for cooling and shaping.

[0029] By adopting the above technical solution of the present invention, at least the following beneficial effects are achieved:

[0030] 1. The recycled EVA scraps are filled into the shoe material cavity of the steam forming mold and directly heated and formed using steam. Compared with hot melting the EVA scraps and remaking them into popcorn materials, the recycling process is simple and can effectively reduce the recycling cost of EVA scraps.

[0031] 2. The production process of the present invention can directly use 100% EVA scraps to produce shoe materials, and the performance of the produced shoe materials can be close to the level of original EVA, and the quality of the shoe materials after molding can be guaranteed; at the same time, the molding process mainly controls the parameters of steam to make adjacent EVA scraps reliably bond together without using adhesives such as AB glue, which is environmentally friendly.

[0032] 3. After molding, the surface of the shoe material can form irregular patterns (as shown in Figure 3), which can enrich the style of the shoe material.

[0033] The technical solution of the present invention is further described in detail below with reference to specific embodiments: Example 1

[0034] A low-cost method for producing shoe materials, comprising:

[0035] The recycled EVA scraps are cut into block particles with a length of 2 cm, a width of 1 cm, and a height of 1 cm. The cut EVA scraps are weighed according to the required weight of the shoe material, and the weighed EVA scraps are filled into the shoe material cavity of the steam forming mold;

[0036] The steam forming mold is controlled to close, and steam is directly introduced into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 1.97 MPa, the steam temperature is 195°C, and the steam heating time is 350 seconds.

[0037] After the shoe material is formed, the steam is turned off and the formed shoe material is cooled for 240 seconds.

[0038] Through actual experimental tests, the performance indicators of the shoe material formed in Example 1 are as follows:

[0039] Hardness: 44C; density: 0.167g / cm³; yellowing resistance: Level 4; rebound: 67%; shrinkage: 0.12%; compression: 40%; trouser tear: 2.6kg / cm; delamination tear: 1kg / cm; all the above performance indicators can meet the performance requirements of EVA shoe materials. Example 2

[0040] A low-cost method for producing shoe materials, comprising:

[0041] The recycled EVA scraps are cut into block particles with a length of 3 cm, a width of 2 cm, and a height of 2 cm. The cut EVA scraps are weighed according to the required weight of the shoe material, and the weighed EVA scraps are filled into the shoe material cavity of the steam forming mold;

[0042] The steam forming mold is controlled to close, and steam is directly introduced into the shoe material cavity of the steam forming mold to heat the shoe material, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.03 MPa, the steam temperature is 255°C, and the steam heating time is 450 seconds.

[0043] After the shoe material is formed, the steam is turned off and the formed shoe material is cooled for 320 seconds.

[0044] Through actual experimental tests, the performance indicators of the shoe material formed in Example 2 are as follows:

[0045] Hardness: 35C; density: 0.125g / cm³; yellowing resistance: Level 4; rebound: 74%; shrinkage: 1%; compression: 48%; trouser tear: 5.4kg / cm; delamination tear: 1.65kg / cm; all the above performance indicators can meet the performance requirements of EVA shoe materials. Example 3

[0046] A low-cost method for producing shoe materials, comprising:

[0047] The recycled EVA scraps are cut into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm. The cut EVA scraps are weighed according to the required weight of the shoe material, and the weighed EVA scraps are filled into the shoe material cavity of the steam forming mold;

[0048] The steam forming mold is controlled to close, and steam is directly introduced into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.00 MPa, the steam temperature is 225°C, and the steam heating time is 400 seconds.

[0049] After the shoe material is formed, the steam is turned off and the formed shoe material is cooled for 280 seconds.

[0050] Through actual experimental tests, the performance indicators of the shoe material formed in Example 3 are as follows:

[0051] Hardness: 39C; density: 0.144g / cm³; yellowing resistance: Level 4; rebound: 70%; shrinkage: 0.55%; compression: 41%; trouser tear: 6.4kg / cm; delamination tear: 1.45kg / cm; all the above performance indicators can meet the performance requirements of EVA shoe materials. Example 4

[0052] A low-cost method for producing shoe materials, comprising:

[0053] The recycled EVA scraps are cut into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm. The cut EVA scraps are weighed according to the required weight of the shoe material, and the weighed EVA scraps are filled into the shoe material cavity of the steam forming mold;

[0054] The steam forming mold is controlled to close, and steam is directly introduced into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.01 MPa, the steam temperature is 225°C, and the steam heating time is 400 seconds.

[0055] After the shoe material is formed, the steam is turned off and the formed shoe material is cooled for 280 seconds.

[0056] Through actual experimental tests, the performance indicators of the shoe material formed in Example 4 are as follows:

[0057] Hardness: 40C; density: 0.15g / cm³; yellowing resistance: level 4; rebound: 72%; shrinkage: 0.54%; compression: 42%; trouser tear: 3.5kg / cm; delamination tear: 1.2kg / cm; all the above performance indicators can meet the performance requirements of EVA shoe materials. Example 5

[0058] A low-cost method for producing shoe materials, comprising:

[0059] The recycled EVA scraps are cut into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm. The cut EVA scraps are weighed according to the required weight of the shoe material, and the weighed EVA scraps are filled into the shoe material cavity of the steam forming mold;

[0060] The steam forming mold is controlled to close, and steam is directly introduced into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 1.99 MPa, the steam temperature is 225°C, and the steam heating time is 400 seconds.

[0061] After the shoe material is formed, the steam is turned off and the formed shoe material is cooled for 280 seconds.

[0062] Through actual experimental tests, the performance indicators of the shoe material formed in Example 5 are as follows:

[0063] Hardness: 41C; density: 0.142g / cm³; yellowing resistance: Level 4; rebound: 72%; shrinkage: 0.46%; compression: 40%; trouser tear: 2.7kg / cm; delamination tear: 1.24kg / cm; all the above performance indicators can meet the performance requirements of EVA shoe materials. Example 6

[0064] A low-cost method for producing shoe materials, comprising:

[0065] The recycled EVA scraps are cut into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm. The cut EVA scraps are weighed according to the required weight of the shoe material, and the weighed EVA scraps are filled into the shoe material cavity of the steam forming mold;

[0066] Controlling the steam forming mold to close the mold, directly introducing steam into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material, wherein the steam forming pressure is 2.00 MPa, the steam temperature is 250°C, and the steam heating time is 400 seconds;

[0067] After the shoe material is formed, the steam is turned off and the formed shoe material is cooled for 280 seconds.

[0068] Through actual experimental tests, the performance indicators of the shoe material formed in Example 6 are as follows:

[0069] Hardness: 42C; density: 0.157g / cm³; yellowing resistance: Level 4; rebound: 71%; shrinkage: 0.52%; compression: 39%; trouser tear: 3.3kg / cm; delamination tear: 1.35kg / cm; all the above performance indicators can meet the performance requirements of EVA shoe materials. Example 7

[0070] A low-cost method for producing shoe materials, comprising:

[0071] The recycled EVA scraps are cut into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm. The cut EVA scraps are weighed according to the required weight of the shoe material, and the weighed EVA scraps are filled into the shoe material cavity of the steam forming mold;

[0072] The steam forming mold is controlled to close, and steam is directly introduced into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.00 MPa, the steam temperature is 210°C, and the steam heating time is 400 seconds.

[0073] After the shoe material is formed, the steam is turned off and the formed shoe material is cooled for 280 seconds.

[0074] Through actual experimental tests, the performance indicators of the shoe material formed in Example 7 are as follows:

[0075] Hardness: 39C; density: 0.142g / cm³; yellowing resistance: Level 4; rebound: 70%; shrinkage: 0.81%; compression: 44%; trouser tear: 4.5kg / cm; delamination tear: 1.6kg / cm; all the above performance indicators can meet the performance requirements of EVA shoe materials. Example 8

[0076] A low-cost method for producing shoe materials, comprising:

[0077] The recycled EVA scraps are cut into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm. The cut EVA scraps are weighed according to the required weight of the shoe material, and the weighed EVA scraps are filled into the shoe material cavity of the steam forming mold;

[0078] The steam forming mold is controlled to close, and steam is directly introduced into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.00 MPa, the steam temperature is 225°C, and the steam heating time is 420 seconds.

[0079] After the shoe material is formed, the steam is turned off and the formed shoe material is cooled for 280 seconds.

[0080] Through actual experimental tests, the performance indicators of the shoe material formed in Example 8 are as follows:

[0081] Hardness: 37C; density: 0.135g / cm³; yellowing resistance: Level 4; rebound: 70%; shrinkage: 0.74%; compression: 44%; trouser tear: 5.1kg / cm; delamination tear: 1.45kg / cm; all the above performance indicators can meet the performance requirements of EVA shoe materials. Example 9

[0082] A low-cost method for producing shoe materials, comprising:

[0083] The recycled EVA scraps are cut into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm. The cut EVA scraps are weighed according to the required weight of the shoe material, and the weighed EVA scraps are filled into the shoe material cavity of the steam forming mold;

[0084] The steam forming mold is controlled to close, and steam is directly introduced into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.00 MPa, the steam temperature is 225°C, and the steam heating time is 380 seconds.

[0085] After the shoe material is formed, the steam is turned off and the formed shoe material is cooled for 280 seconds.

[0086] Through actual experimental tests, the performance indicators of the shoe material formed in Example 9 are as follows:

[0087] Hardness: 42C; density: 0.153g / cm³; yellowing resistance: Level 4; rebound: 69.1%; shrinkage: 0.75%; compression: 41%; trouser tear: 3.2kg / cm; delamination tear: 1.22kg / cm; all of the above performance indicators can meet the performance requirements of EVA shoe materials.

[0088] In summary, the present invention uses 100% EVA scraps to produce a shoe material whose various performance indicators can meet the performance requirements specified for EVA shoe materials. At the same time, the size of the block particles cut into EVA scraps affects the hardness and density of the shoe material. When the size of the block particles is reduced, the hardness and density of the shoe material increase; when the size of the block particles is increased, the hardness and density of the shoe material 200 decrease.

[0089] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A low-cost shoe material production method, characterized in that: The production method comprises: The recycled EVA scraps are filled into the shoe material cavity of the steam forming mold, the steam forming mold is controlled to close, and steam is directly introduced into the shoe material cavity of the steam forming mold for heating, so that the EVA scraps in the shoe material cavity are bonded together to form a shoe material; wherein, the steam forming pressure is 1.97MPA-2.03MPA, the steam temperature is 195℃-255℃, and the steam heating time is 350S-450S.

2. A low-cost shoe material production method as claimed in claim 1, characterized in that: The steam molding pressure is 2.00 MPA.

3. A low-cost shoe material production method as claimed in claim 1, characterized in that: The temperature of the steam was 225°C.

4. A low-cost shoe material production method as claimed in claim 1, characterized in that: The heating time of the steam is 400S.

5. A low-cost shoe material production method as claimed in claim 1, characterized in that: The steam forming mold comprises an upper mold and a lower mold, and a shoe material cavity is formed between the upper mold and the lower mold when the molds are closed; the cavity wall of the shoe material cavity is evenly distributed with air holes, and each of the air holes is connected to the steam generating device through an air pipe.

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