Foaming mold and foaming production method for foaming using this mold

Abstract

The present invention provides a foaming mold and a foaming production method using the mold for foaming. Among them, the foaming mold includes a mold body, in which a feed channel, a mold cavity, an overflow part and a vacuum pumping port are provided. The feed port of the feed channel is formed on the side wall of the mold body, the discharge port of the feed channel is communicated with the mold cavity, the channel of the mold cavity forms a closed structure, the overflow part includes a first overflow cavity and a second overflow cavity, the first overflow inlet of the first overflow cavity is communicated with the mold cavity, the first overflow outlet of the first overflow cavity is communicated with the second overflow inlet of the second overflow cavity, and the vacuum pumping port is arranged on the mold body and communicated with the overflow part. If the actual amount of the rubber melt entering is too much, the rubber melt exceeding the first overflow cavity can overflow into the second overflow cavity, so that the product can avoid bursting due to overfilling. If the actual amount of the rubber melt entering is too little, the mold cavity can also be filled without filling the first overflow cavity, so that the product can avoid generating voids.

Description

Technical Field

[0001] The invention relates to the technical field of foaming molding, in particular to a foaming mold and a foaming production method using the mold for foaming. Background Art

[0002] EVA (ethylene-vinyl acetate copolymer) injection foaming is a product obtained by melting the foaming material at high temperature and then injecting it into the mold through a pipe, thereby foaming in the mold cavity of the mold. In the EVA (ethylene-vinyl acetate copolymer) injection foaming process, the fluidity continues to change due to the continuous cross-linking reaction of the molten glue at high temperature, and due to the unbalanced flow channels between multiple cavities in the mold, the actual amount of material entering each cavity of the mold during continuous injection production is unstable. In the same mold, some cavities have more material feed and some have less material feed, resulting in the problem of insufficient material and overfilling in each cavity of the mold at the same time, which leads to the production of some products with voids due to insufficient material and some products with bursting edges due to overfilling. In order to fill the mold cavity fully and avoid product voids, the amount of glue that exceeds the volume of the mold cavity is usually injected into the mold. In the existing foaming mold, the mold cavity only has one overflow cavity connected to it. When the actual amount of material entering the mold cavity fluctuates greatly, for example, when the actual amount of material entering the mold cavity is too much, the volume of the excess material is greater than the volume of the overflow cavity, resulting in the problem of overfilling; when the actual amount of material entering the mold cavity is too little, the amount of material may not fill the mold cavity, and the mold cavity lacks material, resulting in 5-15 mm voids in the product. Therefore, the products produced by the existing foaming mold have a low product yield.

[0003] Therefore, there is an urgent need for a foaming mold that can avoid edge bursting and cavity phenomena in products and has a high product yield, and a foaming production method using the mold for foaming. Summary of the invention

[0004] The first purpose of the present invention is to provide a foaming mold which can avoid edge bursting and cavity phenomena of products and has a high product yield.

[0005] The second purpose of the present invention is to provide a foaming production method using the foaming mold for foaming, which can avoid edge bursting and voids in the product, thereby improving the product yield.

[0006] To achieve the above first object, the present invention provides a foaming mold, which includes a mold body. An inlet flow channel, a mold cavity, an overflow part and a vacuum extraction port are arranged in the mold body. The inlet of the inlet flow channel is formed on the side wall of the mold body. The outlet of the inlet flow channel is communicated with the mold cavity. The channel of the mold cavity forms a closed structure. The overflow part includes a first overflow cavity and a second overflow cavity. The first overflow inlet of the first overflow cavity is communicated with the mold cavity. The first overflow outlet of the first overflow cavity is communicated with the second overflow inlet of the second overflow cavity. The vacuum extraction port is arranged on the mold body and is communicated with the overflow part.

[0007] Compared with the prior art, since the foaming mold of the present invention is provided with a first overflow cavity and a second overflow cavity, the first overflow cavity is communicated with the mold cavity, and the second overflow cavity is communicated with the first overflow cavity. During the process of injecting the rubber melt into the foaming mold, due to the continuous change of the fluidity of the rubber melt and the unbalanced flow channels among multiple mold cavities in the mold, when the actual amount of material entering the mold cavity fluctuates, if the actual amount of the rubber melt entering is too much, the rubber melt exceeding the first overflow cavity can overflow into the second overflow cavity, so that the product can avoid the phenomenon of edge bursting due to excessive filling of the rubber melt. If the actual amount of the rubber melt entering is too little, the rubber melt can also fill the mold cavity but not fill the first overflow cavity, so that the product can avoid the phenomenon of voids due to less filling of the rubber melt, thereby improving the product yield.

[0008] Preferably, the overflow part further includes a first overflow channel, and the first overflow channel is communicated between the first overflow outlet and the second overflow inlet.

[0009] Preferably, the overflow part further includes a third overflow cavity, and the third overflow cavity is arranged between the mold cavity and the first overflow cavity. The third overflow inlet of the third overflow cavity is communicated with the mold cavity. The third overflow outlet of the third overflow cavity is communicated with the first overflow inlet of the first overflow cavity.

[0010] Preferably, the overflow part further includes a second overflow channel, and the second overflow channel is communicated between the third overflow outlet and the first overflow inlet.

[0011] Preferably, the volume of the second overflow cavity is larger than the volume of the first overflow cavity.

[0012] Preferably, the volume of the third overflow cavity is smaller than the volume of the first overflow cavity.

[0013] Preferably, the foaming mold further includes a material blocking rod, and the material blocking rod is arranged in the inlet flow channel and is used to open or close the inlet of the inlet flow channel.

[0014] Preferably, the material blocking rod is a screw rod, and the material blocking rod is threadedly connected to the mold body and inserted into the inlet flow channel. By withdrawing or inserting the material blocking rod into the inlet flow channel, the inlet of the inlet flow channel is opened or closed.

[0015] Preferably, the number of the mold cavities is plural, the plural mold cavities are spaced apart, the feeding runner has a plurality of discharge ports, and each mold cavity is correspondingly communicated with one discharge port.

[0016] Preferably, the vacuum port is communicated with the second overflow cavity.

[0017] To achieve the above second object, the present invention provides a foaming production method for foaming using the above foaming mold, including the following steps: (1) providing a rubber melt; (2) evacuating the foaming mold through the vacuum port; (3) injecting the rubber melt from the feeding port of the foaming mold, so that the rubber melt fills the mold cavity and the first overflow cavity in sequence, and the second overflow cavity is for the rubber melt that overflows after filling the first overflow cavity to flow in and fill; (4) after the injection of the rubber melt is completed, closing the feeding runner, and the rubber melt filled in the mold cavity undergoes a cross-linking reaction and a foaming reaction, thereby forming a product blank; (5) cooling the product blank and taking out the product blank from the mold body to form the required product.

[0018] Compared with the prior art, the foaming production method of the foaming mold of the present invention uses a foaming mold which has a first overflow cavity and a second overflow cavity. The first overflow cavity is communicated with the mold cavity, and the second overflow cavity is communicated with the first overflow cavity. During the process of injecting the rubber melt into the foaming mold, due to the continuous change of the fluidity of the rubber melt and the unbalanced runners among multiple mold cavities in the mold, when the actual amount of material entering the mold cavity fluctuates, if the actual amount of the rubber melt entering is too much, the rubber melt that exceeds the first overflow cavity can overflow into the second overflow cavity, so that the product can avoid the phenomenon of edge explosion due to excessive filling of the rubber melt. If the actual amount of the rubber melt entering is too little, the rubber melt can also fill the mold cavity without filling the first overflow cavity, so that the product can avoid the phenomenon of voids due to less filling of the rubber melt, thereby improving the product yield.

[0019] Preferably, step (1) further includes the following steps: (11) providing a foaming raw material and an auxiliary agent, the foaming raw material includes ethylene-vinyl acetate copolymer and low-density polyethylene, and the auxiliary agent includes a cross-linking agent and a foaming agent; (12) carrying out mixing, granulation and plasticization on the foaming raw material and the auxiliary agent in sequence, thereby obtaining a rubber melt.

[0020] Preferably, step (12) further includes the following steps: (121) putting the foaming raw material and the auxiliary agent into a mixer for kneading and uniform processing, thereby mixing and forming a rubber mass; (122) putting the rubber mass into a granulator for granulation, thereby forming granulated raw material; (123) adding the granulated raw material into the hopper of a foaming machine, shearing the granulated raw material with a screw, and heating the granulated raw material with a material pipe, so that the granulated raw material forms a flowable rubber melt.

[0021] Preferably, before step (2), it further includes the steps of cleaning the residue in the foaming mold and spraying a mold release agent in the mold cavity. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the internal structure of the foaming mold of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure at the mold cavity of the foaming mold of the present invention. Detailed Embodiments

[0024] In order to elaborate on the technical content and structural features of the present invention in detail, the following further description is provided in conjunction with the embodiments and the accompanying drawings.

[0025] Please refer to Figure 1 and Figure 2, the foaming mold 100 of the present invention includes a mold body 1. An inlet runner 2, a mold cavity 3, an overflow part and a vacuum port 6 are provided inside the mold body 1. The inlet 21 of the inlet runner 2 is formed on the side wall of the mold body 1, and the outlet 22 of the inlet runner 2 is communicated with the mold cavity 3. The first overflow inlet of the first overflow cavity 4 is communicated with the mold cavity 3; the channels of the mold cavity 3 form a closed structure. Specifically, the closed structure is annular, and the closed structure ensures that the rubber melt can fill the mold cavity 3; the overflow part includes a first overflow cavity 4 and a second overflow cavity 5. The first overflow outlet of the first overflow cavity 4 is communicated with the second overflow inlet of the second overflow cavity 5. Specifically, the overflow part further includes a first overflow channel 7, and the first overflow channel 7 is communicated between the first overflow outlet and the second overflow inlet. The diameter of the first overflow cavity 4 and the diameter of the second overflow cavity 5 are both larger than the diameter of the first overflow channel 7; the vacuum port 6 is provided on the mold body 1 and is communicated with the overflow part. Specifically, the vacuum port 6 is communicated with the second overflow cavity 5. The overflow part can be evacuated by evacuating the second overflow cavity 5, but the setting position of the vacuum port 6 is not limited to this. For example, the vacuum port 6 can also be communicated with the first overflow cavity. During the process of injecting the rubber melt into the foaming mold 100, due to the continuous change of the fluidity of the rubber melt and the unbalanced runners among multiple mold cavities 3 in the foaming mold 100, when the actual amount of material entering the mold cavity 3 fluctuates, if the actual amount of the rubber melt entering is too much, the rubber melt exceeding the first overflow cavity 4 can overflow into the second overflow cavity 5 through the first overflow channel 7, so that the product can avoid the phenomenon of edge bursting due to excessive filling of the rubber melt. If the actual amount of the rubber melt entering is too little, the rubber melt can also fill the mold cavity 3 without filling the first overflow cavity 4, so that the product can avoid the bad phenomenon of shrinkage cavities due to less filling of the rubber melt. More specifically, the volume of the second overflow cavity 5 is larger than the volume of the first overflow cavity 4, so as to ensure that the second overflow cavity 5 has enough space for the rubber melt overflowing from the first overflow cavity 4 to overflow, and more fully avoid the phenomenon of edge bursting due to excessive filling of the rubber melt, but it is not limited to this.

[0026] Please continue to refer to Figure 1 and Figure 2, the overflow part further includes a third overflow cavity 8 which is arranged between the mold cavity 3 and the first overflow cavity 4. The third overflow inlet of the third overflow cavity 8 is communicated with the mold cavity 3, and the third overflow outlet of the third overflow cavity 8 is communicated with the first overflow inlet of the first overflow cavity 4. If the actual amount of the rubber material melt entering is too small and the rubber material melt does not overflow into the first overflow cavity 4, the rubber material melt can still overflow from the mold cavity 3 to the third overflow cavity 8 where there is a shortage of material. Therefore, even if the rubber material melt does not overflow into the first overflow cavity 4, it can be ensured that the rubber material melt can overflow into the third overflow cavity, so as to ensure that the rubber material melt can fully fill the mold cavity and avoid voids in the produced products, and further improve the product yield. In this embodiment, the reference of the feeding amount of the rubber material melt can be set to fill from the feeding runner 2 to the first overflow cavity 4, but it is not limited thereto, and those skilled in the art can set the feeding amount of the rubber material melt according to the actual situation. Specifically, the overflow part further includes a second overflow channel 9 which is communicated between the third overflow outlet and the first overflow inlet, and the diameter of the third overflow cavity 8 is larger than that of the second overflow channel 9. Preferably, the volume of the third overflow cavity 8 is smaller than that of the first overflow cavity 4, but it is not limited thereto.

[0027] Please refer to Figure 1 , the foaming mold 100 of the present invention further includes a material blocking rod 11 which is arranged in the feeding runner 2 and is used to open or close the feeding port 21 of the feeding runner 2. Specifically, the material blocking rod 11 is located at a position close to the feeding port 21 of the feeding runner 2, but it is not limited thereto. In this embodiment, the material blocking rod 11 is a screw rod which is threadedly connected to the mold body 1 and inserted into the feeding runner 2. By withdrawing or inserting the material blocking rod 11 into the feeding runner 2, the feeding port 21 of the feeding runner 2 can be opened or closed. When it is necessary to open the feeding port 21 of the feeding runner 2, the material blocking rod 11 can be screwed to make the material blocking rod 11 withdraw from the feeding runner 2, so as to open the feeding port 21 of the feeding runner 2; when it is necessary to close the feeding port 21, the material blocking rod 11 can be screwed to make the material blocking rod 11 re-insert into the feeding runner 2, so as to close the feeding port 21 of the feeding runner 2. However, the material blocking rod 11 is not limited thereto. For example, the material blocking rod 11 can adopt the way of an inserted shaft to realize opening or closing the feeding port 21 of the feeding runner 2.

[0028] Please continue to refer to Figure 1 , in order to improve the production efficiency of the products, in this embodiment, the number of the mold cavities 3 is four, and the multiple mold cavities 3 are distributed at intervals. The feeding runner 2 has multiple discharge ports 22, and each mold cavity 3 is correspondingly communicated with one discharge port 22. By setting multiple mold cavities 3, the foaming mold 100 can produce multiple products at one time, thereby improving the production efficiency of the products. However, the number of the mold cavities 3 is not limited thereto. For example, the number of the mold cavities 3 can be one, two or three, etc.

[0029] Please refer to Figure 1 andFigure 2 , the foam production method using the foam mold 100 of the present invention includes the following steps:

[0030] S11, providing a rubber melt;

[0031] S12, evacuating the foam mold 100 through the vacuum port 6;

[0032] S13, injecting the rubber melt into the foam mold 100 from the feed port 21, so that the rubber melt fills the cavity 3 and the first overflow cavity 4 in sequence, and the second overflow cavity 5 is for the rubber melt that overflows after the first overflow cavity 4 is filled to overflow and be filled;

[0033] S14, after the injection of the rubber melt is completed, closing the feed channel 2, and the rubber melt filled in the cavity 3 undergoes a cross-linking reaction and a foaming reaction, thereby forming a product blank;

[0034] S15, cooling the product blank, and taking out the product blank from the mold body 1 to form the required product.

[0035] Please continue to refer to Figure 1 and Figure 2 , in a preferred embodiment of the foam production method using the foam mold 100, it includes the following steps:

[0036] S21, providing a foam raw material and an auxiliary agent, the foam raw material includes ethylene-vinyl acetate copolymer and low-density polyethylene, and the auxiliary agent includes a cross-linking agent and a foaming agent;

[0037] S22, successively carrying out internal mixing, granulation and plasticization on the foam raw material and the auxiliary agent, thereby obtaining a rubber melt;

[0038] S23, evacuating the foam mold 100 through the vacuum port 6;

[0039] S24, injecting the rubber melt into the foam mold 100 from the feed port 21, so that the rubber melt fills the cavity 3 and the first overflow cavity 4 in sequence, and the second overflow cavity 5 is for the rubber melt that overflows after the first overflow cavity 4 is filled to overflow and be filled;

[0040] S25, after the injection of the rubber melt is completed, closing the feed channel 2, and the rubber melt filled in the cavity 3 undergoes a cross-linking reaction and a foaming reaction, thereby forming a product blank;

[0041] S26, cooling the product blank, and taking out the product blank from the mold body 1 to form the required product.

[0042] Please continue to refer to Figure 1 and Figure 2 , in another preferred embodiment of the foam production method using the foam mold 100, it includes the following steps:

[0043] S31, Provide foaming raw materials and additives. The foaming raw materials include ethylene-vinyl acetate copolymer and low-density polyethylene, and the additives include crosslinking agents and blowing agents;

[0044] S32, Put the foaming raw materials and additives into a kneader for uniform kneading processing, so as to form a rubber mass by kneading;

[0045] S33, Put the rubber mass into a granulator for granulation to form granulated raw materials; wherein, the granulation temperature can be set to 115 °C, but not limited thereto;

[0046] S34, Add the granulated raw materials to the hopper of the foaming machine, use a screw to shear the granulated raw materials, and use a material pipe to heat the granulated raw materials, so that the granulated raw materials form a flowable rubber melt; It should be noted that the temperature of the rubber melt during this period is about 120 °C. Among them, the crosslinking agent can cause the rubber melt to start crosslinking reaction at 105 °C, making the rubber melt more viscous, but not limited thereto;

[0047] S35, Evacuate the foaming mold 100 through the vacuum port 6;

[0048] S36, Inject the rubber melt into the foaming mold 100 from the feed port 21, so that the rubber melt fills the mold cavity 3 and the first overflow cavity 4 in sequence, and the second overflow cavity 5 is for the rubber melt that overflows after filling the first overflow cavity 4 to overflow and fill;

[0049] S37, After the injection of the rubber melt is completed, close the feed channel 2, and the rubber melt filled in the mold cavity 3 undergoes crosslinking reaction and foaming reaction to form a product blank;

[0050] S38, Cool the product blank and take out the product blank from the mold body 1 to form the required product.

[0051] Please continue to refer to Figure 1 and Figure 2 , In another preferred embodiment of the foaming production method using the foaming mold 100 for foaming, it includes the following steps:

[0052] S41, Provide foaming raw materials and additives. The foaming raw materials include ethylene-vinyl acetate copolymer and low-density polyethylene, and the additives include crosslinking agents and blowing agents;

[0053] S42, Put the foaming raw materials and additives into a kneader for uniform kneading processing, so as to form a rubber mass by kneading;

[0054] S43, Put the rubber mass into a granulator for granulation to form granulated raw materials; wherein, the granulation temperature can be set to 115 °C, but not limited thereto;

[0055] S44. Add the granulation raw materials into the hopper of the foaming machine, shear the granulation raw materials with a screw, and heat the granulation raw materials with a material pipe to make the granulation raw materials form a flowable rubber melt. It should be noted that the temperature of the rubber melt during this period is about 120 °C. Among them, the cross-linking agent can cause the rubber melt to start cross-linking reaction at 105 °C, making the rubber melt more viscous, but this is not the limit.

[0056] S45. Evacuate the foaming mold 100 through the vacuum port 6.

[0057] S46. Set the injection amount of the rubber melt to fill the first overflow cavity 4 from the feed channel 2. Inject the rubber melt into the foaming mold 100 from the feed port 21, so that the rubber melt fills the mold cavity 3 and the first overflow cavity 4 in sequence. The second overflow cavity 5 is for the rubber melt that overflows after the first overflow cavity 4 is filled to flow in and be filled.

[0058] S47. After the injection of the rubber melt is completed, close the feed channel 2, and the rubber melt filled in the mold cavity 3 undergoes cross-linking reaction and foaming reaction to form a product blank.

[0059] S48. Cool the product blank and take out the product blank from the mold body 1 to form the required product.

[0060] It should be noted that in the above four embodiments, before step S12, before step S23, before step S35, and step S45, clean the residue in the foaming mold and spray a release agent in the mold cavity. In step S14, step S25, step S37, and step S47, the rubber melt filled in the mold cavity can undergo cross-linking reaction and foaming reaction at about 170 °C.

[0061] In summary, since the foaming mold 100 of the present invention is provided with a first overflow cavity 4 and a second overflow cavity 5, the first overflow cavity 4 is communicated with the mold cavity 3, and the second overflow cavity 5 is communicated with the first overflow cavity 4. During the process of injecting the rubber melt into the foaming mold 100, due to the continuous change in the fluidity of the rubber melt and the unbalanced flow channels existing between the multiple mold cavities 3 in the mold, when the actual amount of material entering the mold cavity 3 fluctuates greatly, if the actual amount of the rubber melt entering is too much, the rubber melt exceeding the first overflow cavity 4 can overflow into the second overflow cavity 5, so that the product can avoid the phenomenon of edge bursting due to excessive filling of the rubber melt. If the actual amount of the rubber melt entering is too little, the rubber melt can also fill the mold cavity 3 without filling the first overflow cavity 4, so that the product can avoid the bad phenomenon of shrinkage cavity due to less filling of the rubber melt, thereby improving the product yield. If the actual amount of the rubber melt entering is too small, the rubber melt does not overflow into the first overflow cavity 4, but the rubber melt can still overflow from the mold cavity 3 to the third overflow cavity 8 to make up for the lack of material. Therefore, even if the rubber melt does not overflow to the first overflow cavity 4, it can be ensured that the rubber melt can overflow to the third overflow cavity, so as to ensure that the rubber melt can fully fill the mold cavity and avoid voids in the produced product, further improving the product yield.

[0062] The above-disclosed are only the preferred examples of the present invention, and the scope of the rights of the present invention cannot be limited thereby. Therefore, all equivalent changes made according to the claims of the present invention fall within the scope covered by the present invention.

Claims

1. A foaming mold, characterized in that, It includes a mold body, in which there are a feed runner, a mold cavity, an overflow part and a vacuum port. The feed inlet of the feed runner is formed on the side wall of the mold body, the discharge outlet of the feed runner is communicated with the mold cavity, the channel of the mold cavity forms a closed structure, the overflow part includes a first overflow cavity and a second overflow cavity, the first overflow inlet of the first overflow cavity is communicated with the mold cavity, the first overflow outlet of the first overflow cavity is communicated with the second overflow inlet of the second overflow cavity, and the vacuum port is arranged on the mold body and communicated with the overflow part; Among them, the overflow part further includes a third overflow cavity, which is arranged between the mold cavity and the first overflow cavity. The third overflow inlet of the third overflow cavity is communicated with the mold cavity, and the third overflow outlet of the third overflow cavity is communicated with the first overflow inlet of the first overflow cavity; the volume of the third overflow cavity is smaller than that of the first overflow cavity; the vacuum port is communicated with the second overflow cavity.

2. The foaming mold according to claim 1, characterized in that, The overflow part further includes a first overflow channel, which is communicated between the first overflow outlet and the second overflow inlet.

3. The foaming mold according to claim 1, wherein The overflow part further includes a second overflow channel, which is communicated between the third overflow outlet and the first overflow inlet.

4. The foaming mold according to claim 1, characterized in that, The volume of the second overflow cavity is larger than that of the first overflow cavity.

5. The foaming mold according to claim 1, characterized in that, It further includes a material blocking rod, which is arranged in the feed runner and used to open or close the feed inlet of the feed runner.

6. The foaming mold according to claim 5, wherein, The material blocking rod is a screw rod, which is threadedly connected to the mold body and inserted into the feed runner. By withdrawing or inserting the material blocking rod into the feed runner, the feed inlet of the feed runner is opened or closed.

7. The foaming mold according to claim 1, wherein The number of the mold cavities is multiple, and the multiple mold cavities are arranged at intervals. The feed runner has multiple discharge outlets, and each mold cavity corresponds to and is communicated with one discharge outlet.

8. A foaming production method using a foaming mold as described in any one of claims 1-7, characterized in that, It includes the following steps: (1) Provide a rubber melt. (2) Vacuum the foaming mold through the vacuum port. (3) Inject the rubber melt from the feed inlet of the foaming mold, so that the rubber melt fills the mold cavity and the first overflow cavity in sequence, and the second overflow cavity is filled with the rubber melt that overflows after the first overflow cavity is filled. (4) After the injection of the rubber melt is completed, close the feed runner, and the rubber melt filled in the mold cavity undergoes a cross-linking reaction and a foaming reaction to form a product blank. (5) Cool the product blank and take out the product blank from the mold body to form the required product.

9. The foaming production method according to claim 8, characterized in that, The step (1) further includes the following steps: (11) Provide a foaming raw material and additives. The foaming raw material includes ethylene-vinyl acetate copolymer and low-density polyethylene, and the additives include a cross-linking agent and a foaming agent. (12) Knead, granulate and plasticize the foaming raw material and the additives in sequence to obtain the rubber melt.

10. The foaming production method according to claim 9, characterized in that, The step (12) further includes the following steps: (121) Put the foaming raw material and the additives into a mixer and knead them evenly to form a rubber mass by mixing. (122) Put the micelles into a granulator for granulation to form granulated raw materials; (123) Add the granulated raw materials into the hopper of a foaming machine, shear the granulated raw materials with a screw, and heat the granulated raw materials with a feed pipe so that the granulated raw materials form the flowable rubber melt.

11. The foaming production method according to claim 8, characterized in that, Before the step (2), it further includes the steps of cleaning the residue in the foaming mold and spraying a mold release agent in the mold cavity.

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