A multi-layer co-extruder

Abstract

The application discloses a kind of multilayer co-extrusion extruder, it is related to composite film production technical field, the multilayer co-extrusion extruder includes sealing shell, elastic roller surface, moving mechanism, piston;The both ends of the elastic roller surface are respectively provided with sealing shell, the elastic roller surface and the sealing shell are enclosed to form the closed accommodation space, a plurality of pistons are provided in the accommodation space, the piston is in contact with the inner wall of the elastic roller surface, moving mechanism is provided on the sealing shell, the moving mechanism is connected with the piston, by moving the piston, the accommodation space is divided into multiple pressure cavities, the moving mechanism is connected with hydraulic mechanism, the accommodation space is filled with hydraulic oil, and the moving mechanism is driven.The pressure of each part of extrusion roller surface can be adjusted, the deformation amount of multiple sheet films is ensured to be the same during extrusion process, so that the thickness of each material in the combined composite film is uniform, and the production quality of composite film is improved.

Description

Technical Field

[0001] This invention belongs to the field of composite film production technology, and specifically relates to a multi-layer co-extrusion extruder. Background Technology

[0002] In the process of producing composite films using a multilayer co-extrusion extruder, the equipment first extrudes different materials separately to form sheet films of a predetermined thickness, and then these sheet films are laminated using an extrusion roller device. However, the currently widely used two-roll extrusion system has significant technical defects: due to the mechanical characteristics of the elastic roller surface, the pressure distribution along the width of the roller exhibits obvious non-linear characteristics, specifically, the pressure at both ends is significantly higher than that in the middle area. This uneven pressure distribution directly leads to regional deformation differences in the composite film during the lamination process, with inconsistent compression deformation between the edge area and the center, resulting in uneven thickness distribution of the materials in each layer of the composite film. When the local deformation of the sheet film exceeds the allowable range of the process, it will directly lead to the final product failing to meet quality standards, seriously affecting the yield and performance stability of the composite film product. This technical bottleneck has become a key factor restricting the production of high-quality composite films.

[0003] Therefore, a multi-layer co-extrusion extruder is needed. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-layer co-extrusion extruder that can adjust the pressure of each part of the extrusion rollers, ensuring that the deformation of multiple sheet films is the same during the extrusion process, resulting in uniform thickness of each material in the composite film after assembly, and improving the production quality of the composite film. The specific technical solution is as follows:

[0005] A multi-layer co-extrusion extruder includes a sealed housing, an elastic roller surface, a moving mechanism, and pistons. Sealing housings are respectively provided at both ends of the elastic roller surface, forming a sealed accommodating space with the elastic roller surface and the sealing housings. Multiple pistons are disposed within the accommodating space, and the pistons abut against the inner wall of the elastic roller surface. A moving mechanism is provided on the sealed housing, connected to the pistons. Moving the pistons divides the accommodating space into multiple pressure chambers. The moving mechanism is connected to a hydraulic mechanism, which fills the accommodating space with hydraulic oil and drives the moving mechanism.

[0006] Preferably, the moving mechanism includes a first movable chamber and a plurality of second movable chambers. The first movable chamber is mounted on the sealed housing. One second movable chamber is sleeved inside the first movable chamber. The plurality of second movable chambers are sleeved on each other. The end of one second movable chamber is connected to a piston. The first movable chamber is connected to the hydraulic mechanism. The first movable chamber and the second movable chambers are connected by a first valve. The second movable chambers are connected to the pressure chamber by a second valve.

[0007] Preferably, the two sealing housings are each provided with the moving mechanism, and the two moving mechanisms are symmetrically arranged about the midpoint of the accommodating space.

[0008] Preferably, the first and second movable compartments are cylindrical structures.

[0009] Preferably, the piston is mounted on the end face of the second movable chamber.

[0010] Preferably, the first valve is disposed on the bottom surface of the second movable compartment, and the second valve is disposed at the end of the sleeve connection between the second movable compartments.

[0011] Preferably, a third valve is provided on the second movable compartment located at the end of the moving mechanism, and the first valve, the second valve and the third valve connect the various pressure chambers in the accommodating space.

[0012] Preferably, the second movable chamber is completely nested within the first movable chamber, and the piston abuts against the sealed housing; the second movable chambers are completely nested within each other, and the pistons installed on each second movable chamber abut against each other.

[0013] Preferably, the elastic roller surface structure includes a base, a buffer layer, and a working surface. The base is made of 40Cr alloy steel, the buffer layer is made of silicone foam, and the working surface is made of polyurethane.

[0014] Preferably, the piston employs a combined seal, with the primary seal being a polytetrafluoroethylene and stainless steel spring accumulator, and the secondary seal being a fluororubber O-ring.

[0015] Compared with existing technologies, the present invention has the following advantages:

[0016] This invention provides a multilayer co-extrusion extruder, comprising a sealed housing, an elastic roller surface, a moving mechanism, and pistons. The elastic roller surface and the sealed housing enclose a sealed accommodating space. Multiple pistons are disposed within the accommodating space. Hydraulic oil or other liquids are injected into the accommodating space via a hydraulic mechanism to achieve the required pressure for extruding composite films. The pistons within the accommodating space divide it into multiple pressure chambers. By adjusting the pressure of the hydraulic oil in each pressure chamber, the pressure exerted on the multilayer composite film by different parts of the elastic roller surface is precisely adjusted, ensuring that the extrusion force applied by the elastic roller surface to the multiple sheet films is the same, thus guaranteeing the production quality of the composite film. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the structure of the elastic roller surface in an embodiment of the present invention.

[0019] Figure 2 This is a complete state diagram of the first and second active compartments in an embodiment of the present invention.

[0020] Figure 3 This is a state diagram of the initial movement of the active chamber A in an embodiment of the present invention.

[0021] Figure 4 This is a diagram showing the state of the second active compartment reaching its maximum travel distance in an embodiment of the present invention.

[0022] Figure 5 This is a state diagram of the active warehouse C moving to the edge of region P in an embodiment of the present invention.

[0023] Figure 6 This is a state diagram of the active compartment B moving to the edge of region P in an embodiment of the present invention.

[0024] Explanation of key figure labels:

[0025] 1. Elastic roller surface; 2. Sealed housing; 3. First movable chamber; 4. Second movable chamber; 4A. Movable chamber A; 4B. Movable chamber B; 4B. Movable chamber C; 401. Pressure chamber; 401A. Pressure chamber A; 401B. Pressure chamber B; 401C. Pressure chamber C; 402. Piston; 402A. Piston A; 402B. Piston B; 402C. Piston C; 5. First valve; 6. Second valve; 7. Accommodation space; 8. Hydraulic mechanism. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Next, the working principle of this embodiment will be described in detail to enable those skilled in the art to better understand the present invention:

[0028] refer to Figure 1 This invention provides a multi-layer co-extrusion extruder, which includes a sealed housing 2, an elastic roller surface 1, a moving mechanism, and pistons 402. The elastic roller surface 1 has sealed housings 2 at both ends, forming a sealed accommodating space 7. Multiple pistons 402 are disposed within the accommodating space 7, and each piston 402 abuts against the inner wall of the elastic roller surface 1. A moving mechanism is disposed on the sealed housing 2 and connected to the pistons 402. Moving the pistons 402 divides the accommodating space 7 into multiple pressure chambers 401. The moving mechanism is connected to a hydraulic mechanism 8, which fills the accommodating space 7 with hydraulic oil and drives the moving mechanism.

[0029] The elastic roller surface 1 is encased in a sealed housing 2 at both ends, forming a compression roller. This compression roller is installed in the output section of a multi-layer co-extrusion extruder. It compresses the multi-layer composite film, connecting multiple composite films together. The accommodating space 7 is injected with hydraulic oil or other liquid via a hydraulic mechanism 8, achieving the required pressure for compressing the composite film. A piston 402 within the accommodating space 7 divides it into multiple pressure chambers 401. Driven by a moving device and hydraulic oil, the pistons 402 can be adjusted to create different volumes in each pressure chamber 401 by changing the distance between them. Adjusting the pressure of the hydraulic oil in each pressure chamber 401 allows for precise adjustment of the pressure exerted on the multi-layer composite film by different parts of the elastic roller surface 1. This ensures that the compression force applied by the elastic roller surface 1 to the multiple film sheets is uniform, guaranteeing the quality of the composite film production. The compression roller is connected to rotating devices at both ends, driving its rotation. The hydraulic mechanism 8 can be connected to the moving device along the axis of the compression roller or connected to the surface of the moving device via a rotating joint.

[0030] In this embodiment, the elastic roller surface 1 structure includes a base, a buffer layer, and a working surface. The base is made of 40Cr alloy steel, the buffer layer is made of silicone foam, and the working surface is made of polyurethane. The base provides rigid support and withstands the pressure of the hydraulic system. The buffer layer absorbs pressure fluctuations to homogenize the pressure. The working surface is the layer in contact with the composite film; it has high hardness and low wear, thereby reducing thickness fluctuations and improving product quality.

[0031] In one implementation of this embodiment, the moving mechanism includes a first movable chamber 3 and a plurality of second movable chambers 4. The first movable chamber 3 is mounted on the sealed housing 2, one second movable chamber 4 is sleeved inside the first movable chamber 3, and the plurality of second movable chambers 4 are sleeved with each other. The end of one second movable chamber 4 is connected to a piston 402. The first movable chamber 3 is connected to the hydraulic mechanism 8. The first movable chamber 3 and the second movable chambers 4 are connected by a first valve 5, and the second movable chambers 4 are connected to the pressure chamber 401 by a second valve 6.

[0032] The first movable chamber 3 and the second movable chamber 4 are both cylindrical structures. The first movable chamber 3 can be connected to a rotating device to drive the elastic roller surface 1 to rotate, thereby extruding the composite film. The first movable chamber 3 is located outside the accommodating space 7. Multiple second movable chambers 4 are nested together in a staggered manner. By injecting or pumping hydraulic oil into the cylindrical structure of the second movable chamber 4 and the pressure chamber 401, the second movable chamber 4 moves, thereby driving the piston 402 mounted on the second movable chamber 4, thus changing the volume and pressure of the pressure chamber 401. The first movable chamber 3 and the second movable chamber 4 are connected by a first valve 5, and the second movable chamber 4 is connected to the pressure chamber 401 by a second valve 6. In actual operation, opening or closing the second valve 6 corresponding to a certain pressure chamber 401 and opening the first valve 5 accordingly can control the change in volume and pressure of a single pressure chamber 401. The volume of the pressure chamber 401 corresponds to the pressure adjustment range on the elastic roller surface 1, and the hydraulic oil pressure in the pressure chamber 401 corresponds to the pressure of the elastic roller surface 1 on the multilayer composite film within this adjustment range.

[0033] Furthermore, in this embodiment, both of the two sealed housings 2 are equipped with the moving mechanism, and the two moving mechanisms are symmetrically arranged around the midpoint of the accommodating space 7. This symmetrical arrangement reduces the length of the second movable chamber 4, and by adjusting the various parts of the elastic roller surface 1 corresponding to the two second movable chambers 4 on both sides, it improves the utilization of space in the accommodating space 7, simplifying the structure and operation. A sealing element 9 is provided on the second movable chamber 4 located at the end of the moving mechanism, and a first valve 3 is provided on the sealing element 9. This arrangement allows the hydraulic oil from the other moving mechanism to automatically fill the accommodating space 7 in the central region of the elastic roller surface 1 through the first valve 3 on the sealing element 9 when the hydraulic mechanism 8 is drawing hydraulic oil from the other moving mechanism, thus improving efficiency.

[0034] In this embodiment, the piston 402 is mounted on the end face of the second movable chamber 4. One piston 402 is mounted on each second movable chamber 4, and the piston 402 is mounted on the end face of the second movable chamber 4. With a low piston 402 thickness, the contact area with the second movable chamber 4 can be increased, improving installation stability. In this embodiment, the piston 402 uses a combined seal, with the main seal being a polytetrafluoroethylene (PTFE) and stainless steel spring accumulator, and the secondary seal being a fluororubber O-ring. When the oil pressure in the pressure chamber 401 increases, the elastic roller surface 1 deforms. This design allows the piston 402 to adapt to changes in the elastic roller surface 1, ensuring the sealing of the pressure chamber 401.

[0035] For details, please refer to Figure 2-6 In actual operation, such as Figures 2-5 The middle P area is the part of the elastic roller surface 1 where the pressure needs to be adjusted. (Refer to...) Figure 2 In the initial state of the moving mechanism, the first movable chamber 3 and the second movable chamber 4 are nested together. In this embodiment, three second movable chambers 4 are provided, namely movable chamber A4A, movable chamber B4B, and movable chamber C4B. The pistons 402 on the three movable chambers are piston A402A, piston B402B, and piston C402C. The three movable chambers are spaced apart when they are nested to facilitate the injection of hydraulic oil. The accommodating space 7 is filled with hydraulic oil. The first valve 5 and the second valve 6 can be solenoid valves, which can be freely controlled to open or close.

[0036] S1: Reference Figure 1-4The first valve 5 on movable chambers B4B and C4B opens, and the second valve 6 on movable chamber A4A opens. The second valve 6 on movable chamber A4A closes, and the hydraulic mechanism 8 injects medium. Because the second valve 6 on movable chamber A4A is closed, movable chamber A4A is pushed out, and a pressure chamber A401A is formed between piston A402A and piston B402B. During the formation process, the second valve 6 on movable chamber A4A is open, and the medium in the accommodating space 7 enters the pressure chamber A401A from the second valve 6. The nested connection of the three movable chambers includes a limit mechanism. The hydraulic mechanism 8 continuously injects medium, so that the stroke of movable chamber A4A reaches its maximum. Similarly, the hydraulic mechanism 8 continuously injects medium, so that the formation of movable chambers A4A, B4B, and C4B reaches its maximum, generating pressure chambers A401A, B401B, and C401C, i.e. Figure 4 .

[0037] S2: Reference Figure 5 and Figure 6 Open the first valve 5 of movable chambers A4A, B4B, and C4B, then open the second valve 6 of movable chamber C4B, and close the remaining second valves 6. The hydraulic mechanism 8 extracts the medium, causing movable chamber C4B to move towards the first movable chamber 3 until piston C402C moves to the edge of region P, i.e. Figure 5 At this point, closing the second valve 6 of movable chamber C4B allows the medium extracted from pressure chamber C401C by the hydraulic structure to be injected into the moving mechanism returning to the other side, thus increasing the size of the middle area of ​​the accommodating space 7. Similarly, opening the second valve 6 of movable chamber B4B causes movable chamber B4B to move towards movable chamber C4B as the hydraulic mechanism 8 extracts the medium, until piston B402B moves to the other edge of region P, i.e. Figure 6 At this time, the pressure chamber B401B covers the area P. At this time, by opening only the first valve 5 of the movable chamber C4B and the first valve 5 and the second valve 6 of the movable chamber B4B, the pressure of the pressure chamber B401B can be adjusted, thereby adjusting the pressure of the area P on the composite membrane.

[0038] Therefore, when there are multiple areas on the elastic roller surface 1 that need to be adjusted, a corresponding number of second movable chambers 4 need to be set up. The specific operation process will not be described here.

[0039] In one embodiment of the present invention, the first valve 5 is disposed on the bottom surface of the second movable chamber 4, and the second valve 6 is disposed at the end of the sleeve connection between the second movable chambers 4. When the second movable chamber 4 is located within the first movable chamber 3, or when the second movable chambers 4 are fully sleeved together, the second valve 6 being disposed at the end of the sleeve connection between the second movable chambers 4 allows the second valve 6 to immediately connect to the pressure chamber 401 after the second movable chamber 4 is moved, thereby facilitating the adjustment of the volume and pressure of the pressure chamber 401.

[0040] In one embodiment of the present invention, the second movable chamber 4 is completely nested in the first movable chamber 3, and the piston 402 abuts against the sealing housing 2; the second movable chambers 4 are completely nested in each other, and the pistons 402 installed on each second movable chamber 4 abut against each other.

[0041] In this configuration, the second movable chamber 4 is completely nested within the first movable chamber 3, and the piston 402 abuts against the sealing housing 2. This means that the second movable chamber 4 can be completely nested within the first movable chamber 3. In this case, the piston 402 installed on the second movable chamber 4 abuts against the sealing housing 2. Similarly, the second movable chambers 4 are completely nested within each other, and the pistons 402 installed on each second movable chamber 4 abut against each other. This means that one second movable chamber 4 is completely fitted into another second movable chamber 4. In this case, the pistons 402 on each second movable chamber 4 abut against each other and fit together to form a whole. This arrangement facilitates the extraction and injection of hydraulic oil in the pressure chamber 401, and when changing the hydraulic oil, it can all be discharged from the pressure chamber 401.

[0042] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the invention and are protected by patent law.

Claims

1. A multi-layer co-extrusion extruder, characterized in that, The multilayer co-extrusion extruder includes a sealed housing (2), an elastic roller surface (1), a moving mechanism, and a piston (402). The elastic roller surface (1) is provided with a sealed housing (2) at both ends. The elastic roller surface (1) and the sealed housing (2) enclose a sealed accommodating space (7). Multiple pistons (402) are provided in the accommodating space (7). The pistons (402) abut against the inner wall of the elastic roller surface (1). The sealing housing (2) is provided with a moving mechanism. The moving mechanism is connected to the pistons (402). By moving the pistons (402), the accommodating space (7) is divided into multiple pressure chambers (401). The moving mechanism is connected to a hydraulic mechanism (8). The accommodating space (7) is filled with hydraulic oil, which drives the moving mechanism. The moving mechanism includes a first movable chamber (3) and a plurality of second movable chambers (4). The first movable chamber (3) is mounted on the sealed housing (2). One second movable chamber (4) is sleeved inside the first movable chamber (3). The plurality of second movable chambers (4) are sleeved together. The end of one second movable chamber (4) is connected to a piston (402). The first movable chamber (3) is connected to the hydraulic mechanism (8). The first movable chamber (3) is connected to the second movable chamber (4) and the second movable chamber (4) are connected by a first valve (5). The second movable chamber (4) is connected to the pressure chamber (401) by a second valve (6).

2. The multi-layer co-extrusion extruder according to claim 1, characterized in that, The two sealed housings (2) are each provided with the moving mechanism, and the two moving mechanisms are symmetrically arranged with respect to the midpoint of the accommodating space (7).

3. The multi-layer co-extrusion extruder according to claim 1, characterized in that, The first active compartment (3) and the second active compartment (4) are cylindrical structures.

4. The multi-layer co-extrusion extruder according to claim 3, characterized in that, The piston (402) is mounted on the end face of the second movable chamber (4).

5. The multi-layer co-extrusion extruder according to claim 1, characterized in that, The first valve (5) is disposed on the bottom surface of the second movable chamber (4), and the second valve (6) is disposed at the end of the sleeve connection between the second movable chambers (4).

6. The multi-layer co-extrusion extruder according to claim 2, characterized in that, A sealing element (9) is provided on the second movable compartment (4) located at the end of the moving mechanism, and a first valve (5) is provided on the sealing element (9).

7. The multi-layer co-extrusion extruder according to claim 1, characterized in that, The second movable chamber (4) is completely nested in the first movable chamber (3), and the piston (402) abuts against the sealed housing (2); the second movable chambers (4) are completely nested in each other, and the pistons (402) installed on each second movable chamber (4) abut against each other.

8. The multi-layer co-extrusion extruder according to claim 1, characterized in that, The elastic roller surface (1) structure includes a base, a buffer layer and a working surface. The base is made of 40Cr alloy steel, the buffer layer is made of silicone foam, and the working surface is made of polyurethane.

9. The multi-layer co-extrusion extruder according to claim 1, characterized in that, The piston (402) adopts a combined seal, with the main seal being a polytetrafluoroethylene and stainless steel spring energy storage ring, and the secondary seal being a fluororubber O-ring.

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