An apparatus for producing a foamed material

Abstract

The application relates to the technical field of foaming material production equipment, in particular to a foaming material production device which comprises an extruder, further comprises a laminated extension injection mechanism and a foaming agent permeation device, the output end of the extruder is communicated with the input end of the laminated extension injection mechanism, and the output end of the laminated extension injection mechanism is communicated with a static mixer, when in use, the polymer is first divided into multiple layers through the laminated extension injection mechanism, then the polymer is thinned, fluid is injected into each layer of the thinned polymer material in the process, finally, the multiple polymer material flows are superimposed together, the permeation rate of the supercritical foaming liquid to the polymer is improved, the foaming agent is injected into the polymer layers at the interfaces respectively after the polymer is divided into multiple layers, the pressure is guaranteed, the contact area of the two is improved, the saturation time of permeation is reduced, and finally, the multiple polymer layers permeated with the foaming liquid are stirred and mixed, the liquid permeation into the polymer is more uniform, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of foam material production equipment technology, and in particular to a foam material production apparatus. Background Technology

[0002] Foamed materials are widely used in various industries, such as construction, where they are used for insulation and heat insulation of cavities, and wind turbine blades, where they serve as supporting and reinforcing core materials. Current continuous extrusion supercritical foamed materials are mainly produced by injecting supercritical liquid as a foaming agent through injection holes in the barrel or material container. The raw materials and foaming agent are then mixed by a screw or agitator, allowing the supercritical liquid to fully permeate and saturate the material for foaming. However, this method suffers from drawbacks: incomplete sealing during screw shearing and mixing in continuous extrusion, short shearing and mixing times, and inability to fully and efficiently permeate the foaming gas to achieve saturation, affecting the consistency of the foaming ratio and pore size.

[0003] For example, Chinese utility model patent (CN204604717U) discloses equipment for producing polymer microporous foamed materials. It mainly includes a closed reaction chamber, a polymer material input device for unidirectional input of polymer and foaming agent and a stirring head for fluid input in the reaction chamber. In other words, this patent directly mixes and stirs the fluid and polymer material in the reaction chamber. Relying solely on stirring and mixing can easily cause the fluid in the polymer material to be more concentrated in one place and less concentrated in another, resulting in uneven distribution of fluid and polymer material. Moreover, the stirring-type mixing cycle is long, which greatly reduces the stirring efficiency.

[0004] To address the aforementioned problem of uneven mixing, inventions such as US20080247266A1 disclose a supercritical liquid injection element made of porous material. This porous material can be a metal or ceramic material formed into a shell or pin. The porous material is incorporated into the shell outline and sprayed onto the surface of the melt as it passes through. Alternatively, it can be formed into a pin-shaped torpedo body fixed in the flow channel, with supercritical foaming liquid injected into the center of the torpedo body. Both of these solutions suffer from insufficient strength of the porous material, resulting in high resistance in the torpedo body within the melt flow channel, insufficient strength, numerous dead corners on the inner wall, and easy material decomposition. Furthermore, the supercritical liquid is injected onto the surface or center of the melt, leading to a long diffusion and penetration time, which cannot guarantee sufficient diffusion of the supercritical liquid within the melt, resulting in uneven mixing. Summary of the Invention

[0005] The technical problem to be solved by the present invention is as follows: In order to solve the problems that existing equipment has insufficient strength of porous materials, large resistance of torpedo-shaped materials in the channels through which the raw material melt flows, insufficient strength, many dead corners on the inner wall, easy material decomposition, and long diffusion and penetration time of supercritical liquid injected into the surface or center of the melt, which cannot ensure that the supercritical liquid diffuses fully in the melt and the mixing is uneven, a foaming material production device is provided.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a foam material production device, including an extruder, a stacking and extending injection mechanism and a foaming agent injection device, wherein the output end of the extruder is connected to the input end of the stacking and extending injection mechanism, the stacking and extending injection mechanism is connected to the foaming agent infiltration device, the stacking and extending injection mechanism is used to divide the polymer material output from the extruder into multiple layers and then extend and thin them and stack them, and the foaming agent infiltration device is used to transport fluid to the stacking and extending injection mechanism and inject the fluid into each layer of polymer material after thinning. The layered extension injection mechanism first divides the polymer into multiple layers and then extends and thins them. Then, fluid is injected and permeates each of the thinned polymer layers. Fluid permeation occurs within the layered extension injection mechanism, which has no moving parts, ensuring the sealing of the cavity and maintaining pressure. This improves the permeation of the supercritical foaming liquid into the polymer. At the same time, after the polymer is divided into multiple layers, foaming agent is injected at the interface of each layer, increasing the contact area between the two and reducing the permeation saturation time. Then, the multi-layered polymer permeated with foaming liquid is stirred and mixed, making the liquid permeate into the polymer and the mixture more uniform, thus improving production efficiency.

[0007] To realize the layered stretching injection mechanism, in some preferred embodiments, the layered stretching injection mechanism includes a stretching mold with a stretching cavity. The stretching mold has an inlet and an outlet communicating with the stretching cavity. The stretching cavity gradually widens in width and thins in thickness from the inlet to the outlet. The stretching mold has a first through hole connecting the stretching cavity and the foaming agent permeation device. By providing a stretching cavity on the stretching mold, polymer enters the stretching cavity through the inlet. The stretching cavity stretches and thins the material, and the stretched polymer is output from the outlet. Simultaneously, after the polymer thins, the first through hole on the stretching mold allows fluid from the foaming agent permeation device to permeate into the polymer.

[0008] To achieve a preferred configuration of the first through-hole on the stretching mold, the stretching mold includes a mold body and a mold core. The outer circumferential surface of the mold core is provided with a confluence groove. One end of the confluence groove has an inlet, and the other end has an outlet. The width and thickness of the confluence groove gradually increase from the inlet to the outlet. The mold body has a mold cavity that matches the mold core, and the mold core is disposed within the mold cavity. The first through-hole is located on the mold core and inside the mold cavity. By placing the first through-hole on the mold core and inside the mold cavity, fluid can permeate into the polymer.

[0009] To better stretch and thin the material, in some preferred embodiments, there are two confluence channels located on the upper and lower sides of the outer circumferential surface of the mold core. The inlets of the two confluence channels are located on one side of the mold core and are arranged along the width direction of the polymer material, while the outlets of the two confluence channels are located on the other side of the mold core and are arranged along the thickness direction of the polymer material. With confluence channels provided on both the upper and lower sides of the outer circumferential surface of the mold core, and the inlets of the two confluence channels arranged along the width direction of the polymer while the outlets of the two confluence channels are arranged along the thickness direction of the polymer, the confluence channels enable continuous spatial twisting of the fluid, and simultaneously enable the polymer to first be layered and then stacked.

[0010] To achieve an alternative configuration of the first through-hole on the stretching mold, in some preferred embodiments, the stretching mold includes a mold body and a mold core. The outer circumferential surface of the mold core is provided with a confluence groove. One end of the confluence groove has an inlet, and the other end has an outlet. The width and thickness of the confluence groove gradually increase from the inlet to the outlet. The mold body is provided with a mold cavity that matches the mold core, and the mold core is disposed within the mold cavity. The first through-hole is disposed on the mold body, located outside the mold cavity. By placing the first through-hole on the mold body and outside the mold cavity, fluid permeates through the polymer from the outside.

[0011] In some preferred embodiments, there are two manifolds located on the upper and lower sides of the outer peripheral surface of the mold core. The inlets of the two manifolds are located on one side of the mold core and are arranged along the width direction of the polymer material, while the outlets of the two manifolds are located on the other side of the mold core and are arranged along the thickness direction of the polymer material.

[0012] This embodiment combines the first two methods of setting the first through hole on the stretching mold. To allow for better liquid penetration into the polymer, in some preferred embodiments, the stretching mold includes a mold body and a mold core. The outer circumferential surface of the mold core is provided with a confluence channel. One end of the confluence channel has an inlet, and the other end has an outlet. The width and thickness of the confluence channel gradually increase from the inlet to the outlet. The mold body has a mold cavity that matches the mold core, and the mold core is disposed within the mold cavity. The first through hole includes a first hole and a second hole. The first hole is disposed on the mold core, and the second hole is disposed on the mold body. The first hole is located on the outside of the mold cavity, and the second hole is located on the inside of the mold cavity. By placing the first hole on the mold core on the outside of the mold cavity and the second hole on the mold body on the inside of the mold cavity, fluid can penetrate both inside and outside the polymer simultaneously.

[0013] In some preferred embodiments, there are two manifolds located on the upper and lower sides of the outer peripheral surface of the mold core. The inlets of the two manifolds are located on one side of the mold core and are arranged along the width direction of the polymer material, while the outlets of the two manifolds are located on the other side of the mold core and are arranged along the thickness direction of the polymer material.

[0014] To achieve better polymer mixing, in some preferred embodiments, the stacked extension injection mechanism includes several extension molds arranged in series. By repeatedly extending and thinning the polymer, the polymer and fluid are permeated, improving mixing efficiency.

[0015] To improve polymer mixing, in preferred embodiments, at least one of the several extrusion molds has its core arranged along a first direction, while the cores of the remaining at least one extrusion mold are arranged along a second direction, with the first and second directions intersecting each other. By arranging the cores along the first and second directions, the core arranged in the first direction outputs the polymer in one direction, and the core arranged in the second direction outputs the polymer in another direction. This multi-directional layering and stacking of the material significantly improves the polymer mixing efficiency.

[0016] In order to improve the conveying force and stability of the polymer output from the extruder, in some preferred embodiments, a melt pump is provided at the output end of the stacked extension injection mechanism, or a melt pump is provided between the input end of the stacked extension injection mechanism and the output end of the extruder.

[0017] To improve the uniformity of polymer mixing, in some preferred embodiments, the output end of the stacked extension injection mechanism is connected to a static mixer. The polymer from the stacked extension injection mechanism is mixed and stirred by the static mixer.

[0018] The beneficial effects of this invention are as follows: In the use of the foaming material production apparatus of this invention, the polymer is first divided into multiple layers by a stacked extension injection mechanism, and then extended and thinned. During this process, fluid is injected into each thinned polymer layer. Finally, the multiple polymer flows are stacked together, improving the permeability of the supercritical foaming liquid to the polymer. Simultaneously, after the polymer is divided into multiple layers, foaming agents are injected at the interfaces to ensure pressure, increase the contact area between the two, and reduce the permeation saturation time. Finally, the multi-layered polymer permeated with foaming liquid is stirred and mixed, making the liquid penetration into the polymer more uniform and improving production efficiency. This avoids the problems of insufficient strength in porous materials during use, such as high resistance in the channels through which the raw material melt flows, insufficient strength, numerous dead corners on the inner wall, and easy material decomposition. Furthermore, when the supercritical liquid is injected onto the surface or center of the melt, the liquid diffusion and permeation time is long, making it impossible to ensure that the supercritical liquid fully diffuses in the melt, resulting in uneven mixing. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the stacked extension injection mechanism in use in Embodiment 1 of the present invention;

[0022] Figure 3 This is a flowchart of the polymer and liquid extension and stacking process of the stacking extension injection mechanism in Embodiment 1 of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the extension mold in Embodiment 1 of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the mold core in Embodiment 1 of the present invention;

[0025] Figure 6 This is a front view of the mold core in Embodiment 1 of the present invention;

[0026] Figure 7 This is a left view of the mold core in Embodiment 1 of the present invention;

[0027] Figure 8 This is a top view of the mold core in Embodiment 1 of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure in this invention where the mold cores are arranged in the same direction;

[0029] Figure 10 This is a schematic diagram of the structure of the mold core of the present invention along the first and second directions. Figure 1 ;

[0030] Figure 11 This is a schematic diagram of the structure of the mold core of the present invention along the first and second directions. Figure 2 ;

[0031] Figure 12 This is a schematic diagram of the structure of the extension mold in Embodiment 2 of the present invention;

[0032] Figure 13 This is a schematic diagram of the structure of the extension mold in Embodiment 3 of the present invention.

[0033] In the diagram: 1. Extruder, 2. Melt pump, 3. Static mixer, 4. Stacking and extending injection mechanism, 401. Extending die, 402. Extending cavity, 403. Inlet, 404. Outlet, 405. First through hole, 4051. First hole, 4052. Second hole, 5. Foaming agent penetration device, 6. Mold body, 601. Mold cavity, 7. Mold core, 701. Manifold, 702. Inlet, 703. Outlet, 8. Vacuum pump, 9. Die head, 10. Product shaping device. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the embodiments:

[0035] This invention is not limited to the specific embodiments listed below. Those skilled in the art can implement this invention using various other specific embodiments based on the content disclosed herein. Any modifications or alterations made to the design structure and concept of this invention fall within the protection scope of this invention. It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Example 1

[0039] like Figure 1-11 As shown, this solution employs a foaming material production apparatus, including an extruder 1, a melt pump 2, a static mixer 3, a stacked extension injection mechanism 4, and a foaming agent permeation device 5. In this embodiment, the fluid can be liquid nitrogen, liquid carbon dioxide, or cyclopentane. The output end of the extruder 1 is connected to the input end of the melt pump 2. A vacuum pump 8 is installed in the extruder 1 to remove water vapor or low-molecular-weight gases from the polymer within the extruder 1. The output end of the melt pump 2 is connected to the input end of the stacked extension injection mechanism 4, and the output end of the stacked extension injection mechanism 4 is connected to the static mixer 3. In this embodiment, the melt pump 2 is located between the extruder 1 and the stacked extension injection mechanism 5. In another embodiment, the melt pump 2 can also be located between the stacked extension injection mechanism 4 and the static mixer 3. An organic head 9 is installed on the output end of the static mixer 3. The stacked extension injection mechanism 4 is connected to the foaming agent penetration device 5. The stacked extension injection mechanism 4 is used to divide the polymer material output by the melt pump 2 into layers and divide it into two, or into three, four or more. Then, the two layers of polymer are stretched and thinned and stacked. The foaming agent penetration device 5 is used to transport fluid to the stacked extension injection mechanism 4 and inject the fluid into each thinned layer of polymer material.

[0040] Because existing liquid permeation devices are directly installed on the cavity wall of the screw extruder to mix with the polymer, gaps will appear during screw extrusion, causing liquid leakage in the liquid permeation device. This results in pressure loss during liquid permeation, making it impossible to control the amount of liquid permeated into the polymer, leading to inaccurate permeate volume. In contrast, this solution injects liquid into the supercritical foaming liquid through the foaming agent permeation device 5 within the stacked extension injection mechanism 4. Since there are no moving parts in the cavity of the stacked extension injection mechanism 4, the sealing of the cavity and the maintenance of pressure are ensured, thereby improving the permeation of the supercritical foaming liquid into the polymer.

[0041] The layered extension injection mechanism 4 includes an extension mold 401, an extension cavity 402 is provided inside the extension mold 401, an input port 403 and an output port 404 are provided on the extension mold 401 and communicate with the extension cavity 402, the width of the extension cavity 402 gradually increases and the thickness gradually decreases from the input port 403 to the output port 404, and a first through hole 405 is provided on the extension mold 401, which connects the extension cavity 402 and the foaming agent infiltration device 5.

[0042] The extension mold 401 includes a mold body 6 and a mold core 7. A confluence groove 701 is provided on the outer peripheral surface of the mold core 7. One end of the confluence groove 701 is provided with an inlet 702, and the other end of the confluence groove 701 is provided with an outlet 703. The width of the confluence groove 701 gradually increases and the thickness gradually decreases from the inlet 702 to the outlet 703. A mold cavity 601 matching the mold core 7 is provided on the mold body 6. The mold core 7 is located in the mold cavity 601. The mold cavity 601 on the mold body 6 and the confluence groove 701 on the mold core 7 cooperate to form the extension cavity 402. A first through hole 405 is provided on the mold core 7. Several first through holes 405 are evenly distributed on the mold core 7. The first through holes 405 are located inside the mold cavity 601. In this embodiment, the first through hole 405 is a round hole. Of course, the first through hole 405 can also be a square hole or an irregularly shaped hole in addition to a round hole.

[0043] There are two flow channels 701 located on the upper and lower sides of the outer peripheral surface of the mold core 7. The inlet 702 of the two flow channels 701 is located on one side of the mold core 7 and is arranged along the width direction of the polymer material. The outlet 703 of the two flow channels 701 is located on the other side of the mold core 7 and is arranged along the thickness direction of the polymer material.

[0044] Three extension molds 401 are connected in series between the melt pump 2 and the static mixer 3. At least one of the mold cores 7 in the three extension molds 401 is arranged along the first direction, and at least one of the remaining stacked extension injection mechanisms 4 is arranged along the second direction. The first direction and the second direction are arranged to intersect each other. In this embodiment, it is preferred that the first direction and the second direction of the mold core 7 are perpendicular to each other.

[0045] Example 2

[0046] Example 2 is another way of setting the first through hole 405 in Example 1, specifically as follows: Figure 12As shown, the extension mold 401 includes a mold body 6 and a mold core 7. A confluence groove 701 is provided on the outer peripheral surface of the mold core 7. One end of the confluence groove 701 is provided with an inlet 702, and the other end of the confluence groove 701 is provided with an outlet 703. The width and thickness of the confluence groove 701 gradually increase from the inlet 702 to the outlet 703. A mold cavity 601 matching the mold core 7 is provided on the mold body 6. The mold core 7 is located in the mold cavity 601. The mold cavity 601 on the mold body 6 and the confluence groove 701 on the mold core 7 cooperate to form the extension cavity 402. A first through hole 405 is provided on the mold body 6. The first through hole 405 is located on the outside of the mold cavity 601.

[0047] Example 3

[0048] Example 3 is a combination of the two types of first through-holes 405 in Examples 1 and 2, specifically as follows: Figure 13 As shown, the extension mold 401 includes a mold body 6 and a mold core 7. A confluence groove 701 is provided on the outer circumferential surface of the mold core 7. One end of the confluence groove 701 has an inlet 702, and the other end has an outlet 703. The width and thickness of the confluence groove 701 gradually increase from the inlet 702 to the outlet 703. The mold body 6 has a mold cavity 601 that matches the mold core 7. The mold core 7 is disposed within the mold cavity 601. The first through hole 405 includes a first hole 4051 and a second hole 4052. The first hole 4051 is disposed on the mold core 7, and the second hole 4052... 2. The mold cavity 601 on the mold body 6 and the confluence groove 701 on the mold core 7 are configured to form an extension cavity 402. The first hole 4051 is located on the outside of the mold cavity 601 and the second hole 4052 is located on the inside of the mold cavity 601. In this embodiment, the liquid is simultaneously penetrated into the polymer on the inside and outside of the mixture through the first hole 4051 and the second hole 4052. This is also the optimal implementation method in the whole scheme, which greatly improves the liquid penetration efficiency into the polymer, and also ensures that the liquid penetrates evenly into the polymer, reduces the later stirring cycle, and improves work efficiency.

[0049] In the above-mentioned foam material production device, the required raw materials are first mixed, melted and extruded through extruder 1. The polymer is then vented of internal air by vacuum pump 8. Melt pump 2 transports the molten and extruded polymer to the extension chamber 402 of the stacking extension injection mechanism 4. Two manifolds 701 first divide the polymer into two layers, that is, divide the polymer into two parts. Then, the polymer is extended and thinned in the extension chamber 402 of the layered polymer. At the same time, liquid is permeated into the thinned polymer. Then, the two layers of polymer are stacked at the outlet 703 of the manifold 701. The polymer is sequentially layered, extended and thinned, permeated by liquid and stacked through three stacking extension injection mechanisms 4 to ensure that the liquid permeation in the polymer is more uniform. Then, the polymer with permeated liquid is transported to static mixer 3 for stirring and mixing, which greatly reduces the stirring cycle of static mixer 3, improves stirring efficiency, and makes the liquid and polymer mix more uniform, ensuring the stability and reliability of subsequent foaming of foam material. The stirred polymer is then transported through die head 9 to product shaping device 10 for shaping and foaming.

[0050] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A foamed material production apparatus, comprising an extruder (1), characterized in that: It also includes a stacking and extending injection mechanism (4) and a foaming agent infiltration device (5). The output end of the extruder (1) is connected to the input end of the stacking and extending injection mechanism (4). The stacking and extending injection mechanism (4) is connected to the foaming agent infiltration device (5). The stacking and extending injection mechanism (4) is used to divide the polymer material output by the extruder (1) into multiple layers and then extend and thin it and stack it. The foaming agent infiltration device (5) is used to transport fluid to the stacking and extending injection mechanism (4) and inject the fluid into each layer of polymer material after it has been thinned. The stacked extension injection mechanism (4) includes an extension mold (401), an extension cavity (402) is provided on the extension mold (401), an input port (403) and an output port (404) communicating with the extension cavity (402) are provided on the extension mold (401), the width of the extension cavity (402) gradually increases and the thickness gradually decreases from the input port (403) to the output port (404), and a first through hole (405) is provided on the extension mold (401), the first through hole (405) connecting the extension cavity (402) and the foaming agent penetration device (5); The extension mold (401) includes a mold body (6) and a mold core (7). The outer peripheral surface of the mold core (7) is provided with a confluence groove (701). One end of the confluence groove (701) is provided with a confluence inlet (702), and the other end of the confluence groove (701) is provided with a flow outlet (703). The width of the confluence groove (701) gradually increases and the thickness gradually decreases from the confluence inlet (702) to the flow outlet (703). The mold body (6) is provided with a mold cavity (601) that matches the mold core (7). The mold core (7) is located inside the mold cavity (601). The first through hole (405) is located on the mold core (7) and is located inside the mold cavity (601).

2. The foaming material production apparatus according to claim 1, characterized in that: There are two flow channels (701) located on the upper and lower sides of the outer peripheral surface of the mold core (7). The inlet (702) of the two flow channels (701) is located on one side of the mold core (7) and is arranged along the width direction of the polymer material. The outlet (703) of the two flow channels (701) is located on the other side of the mold core (7) and is arranged along the thickness direction of the polymer material.

3. The foaming material production apparatus according to claim 1, characterized in that: The extension mold (401) includes a mold body (6) and a mold core (7). The outer peripheral surface of the mold core (7) is provided with a confluence groove (701). One end of the confluence groove (701) is provided with a confluence inlet (702), and the other end of the confluence groove (701) is provided with a flow outlet (703). The width of the confluence groove (701) gradually increases and the thickness gradually decreases from the confluence inlet (702) to the flow outlet (703). The mold body (6) is provided with a mold cavity (601) that matches the mold core (7). The mold core (7) is located inside the mold cavity (601). The first through hole (405) is provided on the mold body (6) and is located outside the mold cavity (601).

4. The foaming material production apparatus according to claim 3, characterized in that: There are two flow channels (701) located on the upper and lower sides of the outer peripheral surface of the mold core (7). The inlet (702) of the two flow channels (701) is located on one side of the mold core (7) and is arranged along the width direction of the polymer material. The outlet (703) of the two flow channels (701) is located on the other side of the mold core (7) and is arranged along the thickness direction of the polymer material.

5. The foaming material production apparatus according to claim 1, characterized in that: The extension mold (401) includes a mold body (6) and a mold core (7). A confluence groove (701) is provided on the outer circumferential surface of the mold core (7). One end of the confluence groove (701) has an inlet (702), and the other end has an outlet (703). The width and thickness of the confluence groove (701) gradually increase from the inlet (702) to the outlet (703). The mold body (6) is provided with a [feature related to the mold core]. (7) A matching mold cavity (601), wherein the mold core (7) is disposed in the mold cavity (601), and the first through hole (405) includes a first hole (4051) and a second hole (4052). The first hole (4051) is disposed on the mold core (7), and the second hole (4052) is disposed on the mold body (6). The first hole (4051) is located on the outside of the mold cavity (601), and the second hole (4052) is located on the inside of the mold cavity (601).

6. The foaming material production apparatus according to claim 5, characterized in that: There are two flow channels (701) located on the upper and lower sides of the outer peripheral surface of the mold core (7). The inlet (702) of the two flow channels (701) is located on one side of the mold core (7) and is arranged along the width direction of the polymer material. The outlet (703) of the two flow channels (701) is located on the other side of the mold core (7) and is arranged along the thickness direction of the polymer material.

7. A foaming material production apparatus according to any one of claims 1-6, characterized in that: The stacked extension injection mechanism (4) includes several extension modules (401) arranged in series with each other.

8. The foaming material production apparatus according to claim 7, characterized in that: The core (7) of at least one of the extended molds (401) is arranged along a first direction, and the core (7) of at least one of the remaining extended molds (401) is arranged along a second direction, with the first direction and the second direction intersecting each other.

9. The foaming material production apparatus according to claim 1, characterized in that: The output end of the stacked extension injection mechanism (4) is provided with a melt pump (2), or a melt pump (2) is provided between the input end of the stacked extension injection mechanism (4) and the output end of the extruder (1).

10. The foaming material production apparatus according to claim 1, characterized in that: The output end of the stacked extension injection mechanism (4) is connected to a static mixer (3).

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