A double-layered polytetrafluoroethylene film laminating and unwinding device

Abstract

The utility model discloses a kind of polytetrafluoroethylene film double-layer stacking material composite unwinding and calendering device, including rack, first unwinding unit for placing first polytetrafluoroethylene film roll material being arranged at the upper portion of rack, second unwinding unit for placing second polytetrafluoroethylene film roll material being arranged at the lower portion of rack, and calendering composite unit being arranged at the discharge path confluence of first unwinding unit and second unwinding unit;First unwinding unit and second unwinding unit all include air inflation shaft, tension detection roller, magnetic powder brake and several guide rollers, upper press roll and lower press roll are combined and calendering compound to two layers of polytetrafluoroethylene film being discharged from first unwinding unit and second unwinding unit.The utility model is through the structure of double-layer unwinding and calendering compound, can be combined and slightly calendered with two layers of polytetrafluoroethylene film blank, form double-layer composite film, so as to carry out defatting and stretching processing simultaneously subsequently, significantly improve production efficiency and equipment utilization.

Description

Technical Field

[0001] This utility model relates to the technical field of polytetrafluoroethylene film processing equipment, and in particular to an unwinding device capable of stacking and calendering two layers of polytetrafluoroethylene film blanks. Background Technology

[0002] Polytetrafluoroethylene (PTFE) film is widely used in aerospace, electronics, chemical, and medical fields due to its excellent resistance to high and low temperatures, chemical corrosion, low coefficient of friction, and excellent electrical insulation properties. The production process of PTFE film typically includes raw material preparation, calendering, degreasing, stretching, and shaping. Unwinding is a crucial pre-processing step, and its stability directly affects the product quality and production efficiency of subsequent processes.

[0003] A search revealed a utility model patent in Chinese patent literature, publication number CN 218174039 U, entitled "A Constant Tension Unwinding Device." This patent discloses a device that uses a pressure sensor to detect the tension of a thin film and a magnetic powder brake to control the rotation speed of an air shaft to achieve constant tension unwinding. This device can effectively ensure constant tension during the unwinding process of a single-layer film, thus improving the unwinding quality.

[0004] However, in the pursuit of higher production efficiency, traditional single-layer film processing methods have limited material throughput per unit time in certain processes such as degreasing and stretching, thus restricting overall output growth. Simultaneous processing of two-layer film preforms in certain subsequent steps would undoubtedly significantly improve production efficiency. However, how to stably unwind two film preforms simultaneously with constant tension and preliminarily composite them into a form suitable for subsequent integrated processing remains a problem that needs to be solved in existing technologies. Traditional unwinding devices are mainly designed for single-layer materials and cannot meet the requirements for simultaneous, stable unwinding and preliminary lamination of two-layer materials.

[0005] Therefore, it is necessary to develop a new type of polytetrafluoroethylene (PTFE) film unwinding device that can simultaneously unwind two rolls of film preforms under constant tension and stack the two layers of film for preliminary calendering and lamination, so that subsequent processes can treat the two-layer material as a whole, thereby improving production efficiency. Utility Model Content

[0006] The purpose of this invention is to provide a polytetrafluoroethylene (PTFE) film double-layer stacked composite unwinding and calendering device to solve the problems of low processing efficiency of single-layer films and lack of equipment suitable for simultaneous unwinding and preliminary lamination of double-layer films in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A polytetrafluoroethylene (PTFE) film double-layer stacked composite unwinding and calendering apparatus includes a frame; a first unwinding unit disposed at the lower part of the frame for carrying and unwinding a first PTFE film roll; a second unwinding unit disposed at the upper part of the frame for carrying and unwinding a second PTFE film roll; and a calendering and laminating unit disposed at the junction of the film output paths of the first and second unwinding units for stacking and laminating the first and second PTFE films.

[0008] Furthermore, the first unwinding unit includes a first air shaft, a first tension detection component, and a first braking component; the first air shaft is used to mount the first polytetrafluoroethylene film roll, the first tension detection component is used to detect the tension of the first polytetrafluoroethylene film, and the first braking component controls the rotational resistance of the first air shaft according to the signal from the first tension detection component.

[0009] Furthermore, the first tension detection component includes a first tension detection roller and a first pressure sensor connected to the first tension detection roller; the first braking component is a first magnetic powder brake, which is connected to the first air shaft.

[0010] Furthermore, the second unwinding unit includes a second air shaft, a second tension detection component, and a second braking component; the second air shaft is used to mount the second polytetrafluoroethylene film roll, the second tension detection component is used to detect the tension of the second polytetrafluoroethylene film, and the second braking component controls the rotational resistance of the second air shaft according to the signal from the second tension detection component.

[0011] Furthermore, the second tension detection component includes a second tension detection roller and a second pressure sensor connected to the second tension detection roller; the second braking component is a second magnetic powder brake, which is connected to the second air shaft. By setting independent constant tension unwinding systems for the upper and lower film layers respectively, it can be ensured that both film layers have stable and controllable tension before entering the calendering and lamination unit, avoiding wrinkles, breakage, or uneven lamination problems caused by uneven tension.

[0012] Furthermore, the calendering composite unit includes an upper pressure roller and a lower pressure roller, and the first polytetrafluoroethylene film and the second polytetrafluoroethylene film pass through the upper pressure roller and the lower pressure roller and are pressed together.

[0013] Furthermore, at least one of the upper and lower pressure rollers is an active roller driven by a drive motor; the gap between the upper and lower pressure rollers is adjustable. By driving the pressure rollers, the film can be actively pulled, ensuring a stable calendering and lamination speed. Adjusting the roller gap can accommodate film preforms of different thicknesses and control the tightness of the laminated double-layer film.

[0014] Furthermore, the calendering composite unit also includes a pressure application mechanism for applying pressure to the upper and lower pressure rollers. Through the pressure application mechanism, appropriate pressure can be applied to the two film layers to make them adhere tightly and form a preliminary composite, but not completely fused, facilitating subsequent separation or processing as a double-layer structure.

[0015] Furthermore, it also includes several guide rollers, respectively disposed on the film travel paths of the first unwinding unit and the second unwinding unit, and in front of the calendering and laminating unit, for guiding the film's movement. The guide rollers help to regulate the film's travel path, ensuring that the film enters the calendering and laminating unit smoothly and accurately.

[0016] Compared with the prior art, the present invention has the following advantages: This device, by setting up two independent constant tension unwinding units, ensures the tension stability and uniformity of the two-layer PTFE film preforms during the unwinding process. The calendering and laminating unit stacks the two layers of film and applies pressure for calendering, initially laminating them into a single unit. This facilitates subsequent processes that treat this double-layer composite film as a single unit for simultaneous processing, such as degreasing and stretching, thereby doubling production capacity and significantly improving production efficiency and equipment utilization. Furthermore, because it is only a preliminary calendering and laminating process and not fully fused, it also reserves operational space for subsequent processes that may require separation. The overall structure is rationally designed, easy to operate, and highly practical, meeting the needs of efficient PTFE film production. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a polytetrafluoroethylene film double-layer stacked composite unwinding and calendering device according to the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the first unwinding unit in this utility model; Figure 3 This is a schematic diagram of the calendering composite unit in this utility model; Figure 4 This is a schematic diagram of the thin film's travel path in this utility model.

[0020] In the diagram: 1-Frame, 2-First unwinding unit, 21-First air shaft, 22-First tension detection roller, 23-First magnetic powder brake, 24-First guide roller, 3-Second unwinding unit, 31-Second air shaft, 32-Second tension detection roller, 33-Second magnetic powder brake, 34-Second guide roller, 4-Calendar composite unit, 41-Upper pressure roller, 42-Lower pressure roller, 43-Drive motor, 44-Pressure application mechanism, 5-Composite film, F1-First polytetrafluoroethylene film, F2-Second polytetrafluoroethylene film. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 As shown, this utility model provides a polytetrafluoroethylene film double-layer stacked composite unwinding and calendering device, including a frame 1, a first unwinding unit 2 disposed at the lower part of the frame 1, a second unwinding unit 3 disposed at the upper part of the frame 1, and a calendering composite unit 4 disposed at the confluence of the film output paths of the first unwinding unit 2 and the second unwinding unit 3.

[0023] The first unwinding unit 2 is used to carry and unwind the first polytetrafluoroethylene (PTFE) film F1 roll. Specifically, the first unwinding unit 2 includes a first air shaft 21 for mounting the first PTFE film roll. The first air shaft 21 is connected to a first magnetic powder brake 23, which provides unwinding resistance. A first tension detection roller 22 is provided on the travel path of the first PTFE film F1. The first tension detection roller 22 is connected to a first pressure sensor, which feeds back the detected film tension signal to the control system. The control system then adjusts the braking torque of the first magnetic powder brake 23 according to this signal, thereby achieving constant tension unwinding of the first PTFE film F1. The first unwinding unit 2 may also include a plurality of first guide rollers 24 for guiding the travel of the first PTFE film F1.

[0024] The structure of the second unwinding unit 3 is similar to that of the first unwinding unit 2. It is used to carry and unwind the second PTFE film F2 roll. Specifically, the second unwinding unit 3 includes a second air shaft 31 for mounting the second PTFE film roll. The second air shaft 31 is connected to a second magnetic powder brake 33. A second tension detection roller 32 is provided on the travel path of the second PTFE film F2. The second tension detection roller 32 is connected to a second pressure sensor to detect the tension of the second PTFE film F2. The braking torque of the second magnetic powder brake 33 is adjusted by the control system to achieve constant tension unwinding of the second PTFE film F2. The second unwinding unit 3 also includes several second guide rollers 34. By configuring independent constant tension control systems for the upper and lower film layers, it can be ensured that both film layers have accurate and stable tension before entering the calendering and laminating unit 4. This is crucial for ensuring the subsequent lamination quality.

[0025] The calendering and laminating unit 4 is located at the confluence of the travel paths of the first polytetrafluoroethylene (PTFE) film F1 and the second PTFE film F2. The calendering and laminating unit 4 includes an upper pressure roller 41 and a lower pressure roller 42. The first PTFE film F1, unwound from the first unwinding unit 2, and the second PTFE film F2, unwound from the second unwinding unit 3, pass through their respective guide rollers and a converging guide roller that may be located in front of the calendering and laminating unit 4, then overlap together and pass together between the upper pressure roller 41 and the lower pressure roller 42.

[0026] At least one of the upper pressure roller 41 and the lower pressure roller 42, for example, the lower pressure roller 42, is driven by a drive motor 43 and serves as the active roller, propelling the film forward. The gap between the upper pressure roller 41 and the lower pressure roller 42 can be adjusted according to the film thickness and the required lamination tightness. The calendering lamination unit 4 also includes a pressure application mechanism 44, such as a cylinder or hydraulic cylinder, which acts on the upper pressure roller 41 or the lower pressure roller 42 to generate a set pressure between the two rollers. When the two layers of film F1 and F2 are stacked and pass through this pair of rollers, they are pressed together under pressure to form a double-layer composite film 5. This pressing is a physical bonding, allowing the two layers of film to move as a single unit in subsequent processing, but it is not a chemical bond or complete fusion.

[0027] The working process of this utility model device in actual use is as follows: First, the first PTFE film roll is mounted on the first air shaft 21, and the second PTFE film roll is mounted on the second air shaft 31. The ends of the two films F1 and F2 are led out, bypassed by their respective guide rollers 24 and 34 and tension detection rollers 22 and 32, and then stacked and passed between the upper pressure roller 41 and the lower pressure roller 42 of the calendering composite unit 4, and led to the subsequent equipment.

[0028] The equipment is started, and the drive motor 43 drives the pressure roller to rotate, starting the film pulling. At the same time, the constant tension control system of the first unwinding unit 2 and the second unwinding unit 3 starts to work. The tension detection rollers 22 and 32 and the corresponding pressure sensors monitor the film tension in real time, and the control system adjusts the braking torque of the first magnetic powder brake 23 and the second magnetic powder brake 33 to ensure that the first polytetrafluoroethylene film F1 and the second polytetrafluoroethylene film F2 are smoothly released from the roll with the set constant tension.

[0029] Two thin films, F1 and F2, are laminated before entering the calendering and laminating unit 4. They are then calendered and laminated under the pressure of the upper roller 41 and the lower roller 42 to form a double-layer composite film 5. This composite film 5 is subsequently sent to subsequent processing equipment such as degreasing and stretching. Because both layers are processed simultaneously, the output per unit time in subsequent processes is significantly increased.

[0030] This invention features a double-layer independent constant tension unwinding design, which ensures the stability of raw material unwinding. The two layers of film are initially bonded together by a calendering composite unit, laying the foundation for double-efficiency processing in subsequent processes. It has significant practical value and economic benefits.

Claims

1. A polytetrafluoroethylene (PTFE) film double-layer laminated composite unwinding and calendering device, characterized in that, include: A frame (1); a first unwinding unit (2), located at the lower part of the frame (1), for carrying and unwinding the first polytetrafluoroethylene film roll; The second unwinding unit (3) is located on the upper part of the frame (1) and is used to carry and unwind the second polytetrafluoroethylene film roll; the calendering and laminating unit (4) is located at the junction of the film output paths of the first unwinding unit (2) and the second unwinding unit (3) and is used to stack the first polytetrafluoroethylene film and the second polytetrafluoroethylene film and perform calendering and laminating.

2. The polytetrafluoroethylene film double-layer stacked composite unwinding and calendering device according to claim 1, characterized in that, The first unwinding unit (2) includes a first air shaft (21), a first tension detection component and a first braking component; the first air shaft (21) is used to install the first polytetrafluoroethylene film roll, the first tension detection component is used to detect the tension of the first polytetrafluoroethylene film, and the first braking component controls the rotational resistance of the first air shaft (21) according to the signal of the first tension detection component.

3. The polytetrafluoroethylene film double-layer stacked composite unwinding and calendering device according to claim 2, characterized in that, The first tension detection component includes a first tension detection roller (22) and a first pressure sensor connected to the first tension detection roller (22); the first braking component is a first magnetic powder brake (23), which is connected to the first air shaft (21).

4. The polytetrafluoroethylene film double-layer stacked composite unwinding and calendering device according to claim 1, characterized in that, The second unwinding unit (3) includes a second air shaft (31), a second tension detection component, and a second braking component; the second air shaft (31) is used to mount the second polytetrafluoroethylene film roll, the second tension detection component is used to detect the tension of the second polytetrafluoroethylene film, and the second braking component controls the rotational resistance of the second air shaft (31) according to the signal from the second tension detection component.

5. The polytetrafluoroethylene film double-layer laminated composite unwinding and calendering device according to claim 4, characterized in that, The second tension detection component includes a second tension detection roller (32) and a second pressure sensor connected to the second tension detection roller (32); the second braking component is a second magnetic powder brake (33), which is connected to the second air shaft (31).

6. The polytetrafluoroethylene film double-layer stacked composite unwinding and calendering device according to claim 1, characterized in that, The calendering composite unit (4) includes an upper pressure roller (41) and a lower pressure roller (42), through which the first polytetrafluoroethylene film and the second polytetrafluoroethylene film pass and are pressed together.

7. The polytetrafluoroethylene film double-layer stacked composite unwinding and calendering device according to claim 6, characterized in that, At least one of the upper pressure roller (41) and the lower pressure roller (42) is an active roller driven by a drive motor (43); the gap between the upper pressure roller (41) and the lower pressure roller (42) is adjustable.

8. The polytetrafluoroethylene film double-layer stacked composite unwinding and calendering device according to claim 6, characterized in that, The calendering composite unit (4) further includes a pressure application mechanism (44) for applying pressure to the upper pressure roller (41) and the lower pressure roller (42).

9. The polytetrafluoroethylene film double-layer stacked composite unwinding and calendering device according to claim 1, characterized in that, It also includes several guide rollers (24, 34), which are respectively arranged on the film travel path of the first unwinding unit (2) and the second unwinding unit (3), and in front of the calendering composite unit (4), for guiding the travel of the film.

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