Method for producing shoe material by using pebax leftover materials

Abstract

Provided in the present invention is a method for producing a shoe material by using PEBAX leftover materials. The method comprises: cutting recycled PEBAX leftover materials into blocky particles; filling a shoe material cavity of a steam forming mold with the cut blocky particles; controlling the steam forming mold to close, and introducing steam into the shoe material cavity of the steam forming mold to perform thermoforming, so as to bond the blocky particles in the shoe material cavity into a shoe material, wherein the steam forming pressure is 2.17 MPa to 2.23 MPa; after the shoe material is formed, turning off the steam, and cooling the formed shoe material; and after cooling is completed, opening the steam forming mold, and taking out the formed shoe material. The present invention has the advantages that 100% of PEBAX leftover materials can be directly used for producing a shoe material, and the performance of the produced shoe material can almost reach the level of original PEBAX, thereby solving the problem of recycling of the PEBAX leftover materials.

Description

A method for producing shoe materials using PEBAX scraps Technical Field

[0001] The present invention relates to the technical field of shoe materials, and in particular to a method for producing shoe materials by utilizing PEBAX scraps. Background Art

[0002] In recent years, supercritical foaming materials and their technologies have been very popular in the market, especially the supercritical foaming of elastomers, which has very broad application prospects in the field of sports shoes because of its advantages such as high rebound, low density and good molding processability.

[0003] At present, the molding process of popcorn shoes generally includes the following steps: the first step is uniform mixing, mixing AB rubber material and popcorn material in an injection molding machine and foaming; the second step is injection, filling the mold with the mixed material in the injection molding machine; the third step is closing the mold; the fourth step is heating the mold; the fifth step is placing the heated mold in a cold box at 0-10 degrees Celsius for rapid cooling; the sixth step is opening the mold, and the time from injection to opening the mold is about 8 minutes; the seventh step is taking the finished product; the eighth step is spraying the mold, spraying the release agent evenly into the mold; the ninth step is wiping the mold, wiping the mold clean with a clean cotton cloth.

[0004] PEBAX (nylon elastomer) is a common material used in the production of popcorn shoe materials. When molded sheets are made into products such as soles, PEBAX scraps are inevitably generated. Because PEBAX scraps have already undergone mixing, foaming, and molding, and their particles are significantly larger than those of the original PEBAX popcorn material, they cannot be directly recycled into the injection molding machine for further use. Furthermore, if PEBAX scraps are hot-melted and remade into popcorn material, the quality of the remade popcorn material cannot be guaranteed due to the addition of AB rubber, which in turn affects the quality of the finished product. Therefore, the recycling and reuse of PEBAX scraps remains relatively difficult. In light of these issues, the inventors of this case conducted in-depth research, leading to the present case. Technical issues

[0005] The technical problem to be solved by the present invention is to provide a method for producing shoe materials using PEBAX scraps, which can directly use PEBAX scraps to produce shoe materials, and the performance of the produced shoe materials is close to the level of original PEBAX. Technical Solutions

[0006] The present invention is achieved by: a method for producing shoe materials using PEBAX scraps, the method comprising the following steps:

[0007] ①Cut the recycled PEBAX scraps into block particles;

[0008] ② Fill the cut block particles into the shoe material cavity of the steam forming mold;

[0009] ③ Control the steam forming mold to close the mold, and introduce steam into the shoe material cavity of the steam forming mold for heating and forming, so that the block particles in the shoe material cavity are bonded together to form the shoe material, wherein the steam forming pressure is 2.17MPA-2.23MPA;

[0010] ④After the shoe material is formed, turn off the steam and cool the formed shoe material;

[0011] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material.

[0012] Furthermore, in step ③, the temperature of the steam is 170°C-230°C.

[0013] Furthermore, in step ③, the temperature of the steam is 170°C-230°C.

[0014] Furthermore, in step ③, the steam heating time is 400S-500S.

[0015] Furthermore, in step ④, the cooling time is 240S-320S. Beneficial effects

[0016] By adopting the technical solution of the present invention, at least the following beneficial effects are achieved:

[0017] The recycled PEBAX scraps are cut into block particles, and the block particles are weighed according to the needs of the shoe materials and filled into a steam forming mold. Steam that meets specific parameter requirements is directly introduced into the steam forming mold for heating, so that adjacent block particles are bonded to each other, thereby forming soles, insoles or sheets. Therefore, the process of the present invention can directly use 100% PEBAX scraps to produce shoe materials, and the performance of the produced shoe materials can be close to the level of original PEBAX, which well solves the problem of recycling and reuse of PEBAX scraps. Moreover, in the process of using PEBAX scraps for molding, the adjacent block particles are reliably bonded together mainly by controlling the parameters of the steam, without the use of adhesives such as AB glue, which is environmentally friendly. At the same time, after molding with block particles, irregular patterns can be formed on the surface of the shoe material, which can enrich the style of the shoe material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] FIG1 is a flowchart of a method for producing shoe materials using PEBAX scraps according to the present invention;

[0020] FIG2 is a perspective view of a steam forming mold according to the present invention;

[0021] FIG3 is a schematic diagram of the principle of the steam forming mold of the present invention;

[0022] FIG4 is a schematic structural diagram of the shoe material after molding according to the present invention.

[0023] Description of reference numerals:

[0024] Steam forming mold 100, upper mold 101, lower mold 102, shoe material cavity 103;

[0025] Shoe materials 200. Best Mode for Carrying Out the Invention

[0026] 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.

[0027] 1 to 4 , the present invention provides a method for producing shoe materials using PEBAX scraps, the method comprising the following steps:

[0028] ①Cut the recycled PEBAX scraps into block particles;

[0029] Since the present invention cuts PEBAX scrap into block particles and then directly hot-presses the block particles into shoe materials using a steam forming mold, the specifications of the block particles are very demanding. If the block particles are too large, they will expand during molding in the steam forming mold, making it difficult to cool the molded shoe material, prolonging the entire production process, and potentially developing holes in the molded shoe material. On the other hand, if the block particles are too small, they will not provide sufficient support in the steam forming mold, resulting in a high relative density of the molded shoe material, which in turn leads to a stiff molded shoe material. To this end, in step 1 of the present invention, the block particles have a length of 2-3 cm, a width of 1-2 cm, and a height of 1-2 cm. By using block particles of these specifications, the molded shoe material is easier to cool, helping to reduce production time and improve production efficiency. The molded shoe material does not develop holes, has a moderate relative density, and is not stiff, thus ensuring the quality of the molded shoe material.

[0030] ② Fill the cut block particles into the shoe material cavity 103 of the steam forming mold 100; when implementing step ②, it is necessary to weigh the cut block particles according to the required weight of the shoe material, and fill the weighed block particles into the shoe material cavity 103 of the steam forming mold 100 to ensure that the shoe material after molding will not be too light or too heavy.

[0031] The steam forming mold 100 includes an upper mold 101 and a lower mold 102. When the molds are closed, a shoe material cavity 103 is formed between the upper mold 101 and the lower mold 102; the cavity wall of the shoe material cavity 103 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 working, the steam generating device can directly pass steam into the shoe material cavity 103, thereby achieving heating and forming of the block particles filled in the shoe material cavity 103; in the specific implementation of the present invention, the cavity wall of the shoe material cavity 103 is covered with air holes, and each air hole is evenly distributed on the cavity wall of the shoe material cavity 103, which can ensure that each position of the shoe material cavity 103 is heated evenly, so that the block particles in the shoe material cavity 103 are evenly heated, and ensure that adjacent block particles can be reliably bonded together.

[0032] ③ Controlling the steam forming mold 100 to close the mold, and introducing steam into the shoe material cavity 103 of the steam forming mold 100 for heating and forming, so that the block particles in the shoe material cavity 103 are bonded together to form the shoe material 200;

[0033] Since the present invention has strict requirements on the steam forming pressure, steam temperature and steam heating time during its specific implementation; if the steam forming pressure is too high, the block particles will melt, while if the steam forming pressure is too low, the bonding effect between the block particles will be relatively poor; if the steam temperature is too high, the block particles will melt, while if the steam temperature is too low, the bonding effect between the block particles will be relatively poor; if the steam heating time is too long, steam will be wasted and it will be detrimental to improving production efficiency, while if the steam heating time is too short, the bonding effect between the block particles will be relatively poor; Therefore, in step ③ of the present invention, the steam molding pressure is 2.17MPA-2.23MPA, the steam temperature is 170℃-230℃, and the steam heating time is 400S-500S. By adopting the above-mentioned steam parameters, it can be ensured that the block particles will not melt, and the block particles can be reliably bonded together, ensuring that the molded shoe material will not break during use, so that the performance of the produced shoe material can be close to the level of original PEBAX; preferably, the steam molding pressure is 2.20MPA, the steam heating time is 450S, and the steam temperature is 200℃.

[0034] ④ After the shoe material 200 is formed, the steam is turned off and the formed shoe material 200 is cooled. In the present invention, if the cooling time is too short, the bulk particles will expand, resulting in poor shaping. If the cooling time is too long, production time will be extended, which is not conducive to improving production efficiency. Therefore, in step ④ of the present invention, the cooling time is 240s-320s. This ensures that the bulk particles after forming will not expand, resulting in poor shaping, and also helps improve production efficiency. In addition, after turning off the steam, cooling water can be introduced into the shoe material cavity of the steam forming mold 100 to cool and shape the shoe material 200.

[0035] ⑤ After cooling is completed, the steam forming mold 100 is opened and the formed shoe material 200 is taken out. In the specific implementation of the present invention, the shoe material 200 is a sole, an insole or a sheet.

[0036] The present invention cuts recycled PEBAX scraps into block particles, weighs the block particles according to the needs of the shoe material, and fills them into a steam forming mold 100, and directly introduces steam that meets specific parameter requirements into the steam forming mold 100 for heating, so that adjacent block particles are bonded to each other, thereby forming a sole, insole or sheet; therefore, the process of the present invention can directly use 100% PEBAX scraps to produce shoe materials 200, and the performance of the produced shoe materials can be close to the level of original PEBAX, which well solves the problem of recycling and reuse of PEBAX scraps; and in the process of using PEBAX scraps for molding, the adjacent block particles are reliably bonded together mainly by controlling the parameters of the steam, without the use of adhesives such as AB glue, which is environmentally friendly; at the same time, after molding with block particles, the surface of the shoe material can form an irregular pattern (as shown in Figure 4), which can enrich the style of the shoe material.

[0037] The technical solution of the present invention is further described in detail below with reference to specific embodiments: Example 1

[0038] A method for producing shoe materials using PEBAX scraps, the method comprising:

[0039] ①Cut the recycled PEBAX scraps into block particles with a length of 2 cm, a width of 1 cm, and a height of 1 cm;

[0040] ② Weighing the block particles according to the required weight of the shoe material, and filling the weighed block particles into the shoe material cavity of the steam forming mold;

[0041] ③ Controlling the steam forming mold to close the mold, and introducing steam into the shoe material cavity of the steam forming mold to heat it, so that the block particles in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.17 MPa, the steam temperature is 170°C, and the steam heating time is 400 seconds.

[0042] ④ After the shoe material is formed, turn off the steam and cool the formed shoe material for 240 seconds;

[0043] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material. Example 2

[0044] A method for producing shoe materials using PEBAX scraps, the method comprising:

[0045] ①Cut the recycled PEBAX scraps into block particles with a length of 3 cm, a width of 2 cm, and a height of 2 cm;

[0046] ② Weighing the block particles according to the required weight of the shoe material, and filling the weighed block particles into the shoe material cavity of the steam forming mold;

[0047] ③ Controlling the steam forming mold to close the mold, and introducing steam into the shoe material cavity of the steam forming mold to heat it, so that the block particles in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.23 MPa, the steam temperature is 230°C, and the steam heating time is 500 seconds;

[0048] ④ After the shoe material is formed, turn off the steam and cool the formed shoe material for 320 seconds;

[0049] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material. Example 3

[0050] A method for producing shoe materials using PEBAX scraps, the method comprising:

[0051] ① Cut the recycled PEBAX scraps into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm;

[0052] ② Weighing the block particles according to the required weight of the shoe material, and filling the weighed block particles into the shoe material cavity of the steam forming mold;

[0053] ③ Controlling the steam forming mold to close the mold, and introducing steam into the shoe material cavity of the steam forming mold to heat it, so that the block particles in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.20 MPa, the steam temperature is 200°C, and the steam heating time is 450 seconds.

[0054] ④ After the shoe material is formed, turn off the steam and cool the formed shoe material for 280 seconds;

[0055] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material. Example 4

[0056] A method for producing shoe materials using PEBAX scraps, the method comprising:

[0057] ① Cut the recycled PEBAX scraps into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm;

[0058] ② Weighing the block particles according to the required weight of the shoe material, and filling the weighed block particles into the shoe material cavity of the steam forming mold;

[0059] ③ Controlling the steam forming mold to close the mold, and introducing steam into the shoe material cavity of the steam forming mold to heat it, so that the block particles in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.21 MPa, the steam temperature is 200°C, and the steam heating time is 450 seconds.

[0060] ④ After the shoe material is formed, turn off the steam and cool the formed shoe material for 280 seconds;

[0061] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material. Example 5

[0062] A method for producing shoe materials using PEBAX scraps, the method comprising:

[0063] ①Cut the recycled PEBAX scraps into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm;

[0064] ② Weighing the block particles according to the required weight of the shoe material, and filling the weighed block particles into the shoe material cavity of the steam forming mold;

[0065] ③ Controlling the steam forming mold to close the mold, and introducing steam into the shoe material cavity of the steam forming mold to heat it, so that the block particles in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.18 MPa, the steam temperature is 200°C, and the steam heating time is 450 seconds.

[0066] ④ After the shoe material is formed, turn off the steam and cool the formed shoe material for 280 seconds;

[0067] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material. Example 6

[0068] A method for producing shoe materials using PEBAX scraps, the method comprising:

[0069] ① Cut the recycled PEBAX scraps into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm;

[0070] ② Weighing the block particles according to the required weight of the shoe material, and filling the weighed block particles into the shoe material cavity of the steam forming mold;

[0071] ③ Controlling the steam forming mold to close the mold, and introducing steam into the shoe material cavity of the steam forming mold to heat it, so that the block particles in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.20 MPa, the steam temperature is 220°C, and the steam heating time is 450 seconds;

[0072] ④ After the shoe material is formed, turn off the steam and cool the formed shoe material for 280 seconds;

[0073] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material. Example 7

[0074] A method for producing shoe materials using PEBAX scraps, the method comprising:

[0075] ① Cut the recycled PEBAX scraps into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm;

[0076] ② Weighing the block particles according to the required weight of the shoe material, and filling the weighed block particles into the shoe material cavity of the steam forming mold;

[0077] ③ Controlling the steam forming mold to close the mold, and introducing steam into the shoe material cavity of the steam forming mold to heat it, so that the block particles in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.20 MPa, the steam temperature is 180°C, and the steam heating time is 450 seconds;

[0078] ④ After the shoe material is formed, turn off the steam and cool the formed shoe material for 280 seconds;

[0079] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material. Example 8

[0080] A method for producing shoe materials using PEBAX scraps, the method comprising:

[0081] ① Cut the recycled PEBAX scraps into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm;

[0082] ② Weighing the block particles according to the required weight of the shoe material, and filling the weighed block particles into the shoe material cavity of the steam forming mold;

[0083] ③ Controlling the steam forming mold to close the mold, and introducing steam into the shoe material cavity of the steam forming mold to heat it, so that the block particles in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.20 MPa, the steam temperature is 200°C, and the steam heating time is 480 seconds;

[0084] ④ After the shoe material is formed, turn off the steam and cool the formed shoe material for 280 seconds;

[0085] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material. Example 9

[0086] A method for producing shoe materials using PEBAX scraps, the method comprising:

[0087] ① Cut the recycled PEBAX scraps into block particles with a length of 2.5 cm, a width of 1.5 cm, and a height of 1.5 cm;

[0088] ② Weighing the block particles according to the required weight of the shoe material, and filling the weighed block particles into the shoe material cavity of the steam forming mold;

[0089] ③ Controlling the steam forming mold to close the mold, and introducing steam into the shoe material cavity of the steam forming mold to heat it, so that the block particles in the shoe material cavity are bonded together to form the shoe material. The steam forming pressure is 2.20 MPa, the steam temperature is 200°C, and the steam heating time is 430 seconds.

[0090] ④ After the shoe material is formed, turn off the steam and cool the formed shoe material for 280 seconds;

[0091] ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material.

[0092] After actual experimental testing, the specific performance indicators of the above embodiments 1-9 are as follows:

[0093]

[0094] As shown in the table above, the footwear material produced using 100% PEBAX scraps in this invention meets all performance requirements for PEBAX footwear materials (hardness, density, yellowing resistance, rebound, shrinkage, compression, trouser tearing, and delamination tearing). Furthermore, the table also shows that the size of the pellets cut from PEBAX scraps affects the hardness and density of the shoe material. When the pellet size decreases, the hardness and density of the shoe material increase; when the pellet size increases, the hardness and density of the shoe material decrease.

[0095] 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 method for producing shoe materials using PEBAX scraps, characterized in that: The method comprises the following steps: ①Cut the recycled PEBAX scraps into block particles; ② Fill the cut block particles into the shoe material cavity of the steam forming mold; ③ Control the steam forming mold to close the mold, and introduce steam into the shoe material cavity of the steam forming mold for heating and forming, so that the block particles in the shoe material cavity are bonded together to form the shoe material, wherein the steam forming pressure is 2.17MPA-2.23MPA; ④After the shoe material is formed, turn off the steam and cool the formed shoe material; ⑤After cooling is completed, open the steam molding mold and take out the molded shoe material.

2. A method for producing shoe materials using PEBAX scraps as claimed in claim 1, characterized in that: In step ③, the temperature of the steam is 170°C-230°C.

3. A method for producing shoe materials using PEBAX scraps as claimed in claim 1, characterized in that: In step ③, the heating time of steam is 400S-500S.

4. A method for producing shoe materials using PEBAX scraps as claimed in claim 1, characterized in that: In step ④, the cooling time is 240S-320S.

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