Polytetrafluoroethylene film intelligent heating and shaping equipment

Abstract

The utility model belongs to polytetrafluoroethylene film processing equipment technical field discloses a kind of polytetrafluoroethylene film intelligent heating setting equipment, the equipment includes rack, unwinding mechanism being arranged on rack, winding mechanism and the heating setting box between being located unwinding mechanism and winding mechanism, heating setting box is equipped with several guide rollers and heating roller, polytetrafluoroethylene film passes through guide roller and heating roller in turn, heating setting box is divided into multiple independent temperature control zones along the width direction of film, at least one heating unit and temperature sensor are equipped in each independent temperature control zone, equipment further includes film state detection unit being arranged before the entrance of heating setting box, and a controller, controller is connected with film state detection unit, the temperature sensor of each independent temperature control zone and heating unit respectively.The utility model can be adjusted setting temperature according to the real-time state of film, improve setting uniformity and product quality, enhance process adaptability.

Description

Technical Field

[0001] This utility model relates to the technical field of polytetrafluoroethylene (PTFE) film production and processing equipment, and in particular to a device for heating and shaping polytetrafluoroethylene film after stretching, specifically a shaping device capable of intelligently adjusting the heating process. Background Technology

[0002] Polytetrafluoroethylene (PTFE) films are widely used in chemical, electronics, medical, and aerospace industries due to their excellent resistance to high and low temperatures, chemical corrosion, low coefficient of friction, and good electrical insulation properties. Their production process typically includes mixing PTFE resin with an extrusion aid (such as kerosene), extrusion molding, rolling into a film, degreasing, stretching, and high-temperature heat setting. High-temperature heat setting is a key process, its purpose being to eliminate internal stress generated during stretching, stabilize the microporous structure and size of the film, and impart the final performance characteristics to the film.

[0003] Existing PTFE film heating and shaping equipment typically uses a single, integrated heating chamber with internal heating rollers or a hot air system to heat the passing film. This type of equipment often uses a single temperature setpoint to control the entire heating chamber or all heating rollers.

[0004] However, after the preceding rolling and stretching processes, PTFE films may exhibit non-uniformity in thickness, internal structure, or residual stress along their width. Furthermore, the film's running tension may fluctuate during production. Using a uniform, fixed heating temperature for setting is insufficient to accurately accommodate variations in the film's condition and process variations. For thicker areas, a uniform temperature may lead to inadequate setting; for thinner areas, overheating may occur. Simultaneously, for film products of different specifications (thickness, stretch ratio), frequent adjustments and experimentation with setting process parameters are necessary, resulting in room for improvement in production efficiency and process stability.

[0005] How to achieve more precise, uniform, and adaptable heat setting of PTFE films to changes in film state is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an intelligent heating and shaping device for polytetrafluoroethylene (PTFE) films. This device aims to solve the problems of low temperature control accuracy, poor uniformity, and difficulty in adapting to changes in film state in existing shaping equipment, thereby improving shaping quality and production efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A smart heating and shaping device for polytetrafluoroethylene (PTFE) film includes a frame, an unwinding mechanism and a winding mechanism mounted on the frame, and a heating and shaping box located between the unwinding mechanism and the winding mechanism. The heating and shaping box contains several guide rollers and heating rollers for guiding and heating the PTFE film. Its innovation lies in:

[0009] The internal heating space of the heating and shaping chamber is divided into at least two independent temperature control zones along the width direction of the film. Each independent temperature control zone is equipped with at least one heating unit and at least one temperature sensor. This partitioned design allows for different heating intensities to be applied to different areas along the width direction of the film.

[0010] The device also includes at least one film state detection unit, which is located before the inlet of the heating and shaping chamber, for real-time detection of at least one physical parameter of the film to be shaped, such as the film thickness distribution, surface temperature or running tension.

[0011] In addition, the equipment is equipped with a controller. The signal input terminals of the controller are electrically connected to the film state detection unit and the temperature sensors of each independent temperature control zone, respectively, and its signal output terminals are electrically connected to the heating units of each independent temperature control zone. This controller (e.g., a PLC or industrial computer) runs specific control logic or algorithms. It can receive physical parameter data (such as thickness values ​​at various points) from the film state detection unit and feedback temperature data from the temperature sensors of each temperature zone in real time. Based on this real-time input information and preset process targets (such as target shaping temperature curves, allowable temperature difference ranges, etc.), the controller can dynamically and independently calculate and adjust the heating power of the heating units in each independent temperature control zone.

[0012] Using the above technical solution, when the thickness of a certain width region of the film is detected to be large, the controller will correspondingly increase the heating power of the corresponding temperature control zone to ensure that the region receives sufficient heat for proper shaping; conversely, if a certain region is detected to be too thin, the heating power of the corresponding temperature zone can be reduced to prevent overheating. Similarly, adaptive adjustments can also be made based on detected inlet temperature or tension fluctuations.

[0013] Furthermore, the thin film state detection unit may specifically include a thin film thickness sensor array for non-contact measurement of the thickness distribution of the thin film in the width direction as it enters the shaping box.

[0014] Furthermore, the film state detection unit may also include a film tension sensor for monitoring the real-time running tension of the film when it enters the setting box, and the controller can adjust the heating strategy or running speed according to the tension change.

[0015] Furthermore, the heating unit is preferably an infrared heating lamp or a resistance heater that has a fast response speed and is easy to control precisely.

[0016] Furthermore, the temperature sensor is preferably a non-contact infrared temperature sensor, which directly measures the real-time temperature of the thin film surface in the corresponding temperature zone, providing accurate feedback for closed-loop control.

[0017] Furthermore, the controller can be linked with the drive system of the heating roller or the drive system of the winding mechanism to adjust the running speed (i.e., setting time) of the film in the setting box according to the detected film state (such as average thickness and tension).

[0018] Furthermore, in order to improve the overall temperature uniformity inside the chamber, a hot air circulation device can be added to the heating and shaping chamber.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. This utility model helps to improve the temperature uniformity of the film in the width direction by using independent temperature control in zones and adaptive adjustment based on the real-time state of the film, ensuring that each part is properly heated and shaped, reducing problems such as dimensional instability and mechanical property differences caused by uneven shaping, thereby improving the quality and consistency of the final product, and improving shaping uniformity and product quality.

[0021] 2. This invention can automatically compensate for the unevenness of the incoming film and fluctuations in process conditions, reducing the stringent requirements for the stability of the preceding processes. Simultaneously, for switching between different product specifications, the controller parameters can be adjusted quickly to adapt, reducing manual debugging time, improving the flexibility and overall efficiency of the production line, and enhancing process adaptability and production efficiency. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the structure of a smart heating and shaping device for polytetrafluoroethylene film according to this utility model.

[0024] Figure 2 This is a schematic diagram of the internal structure and zoned control of the heating and shaping box in this utility model, illustrating the division of independent temperature control zones and the independent control of the heating units in each zone by the controller.

[0025] In the diagram: 1-unwinding mechanism, 2-rewinding mechanism, 3-heating and shaping box, 4a-guide roller, 4b-heating roller, 5a-heating unit, 5b-temperature sensor, 6-film state detection unit, 7-controller, 8-film; independent temperature control zones (temperature control zone 1, temperature control zone 2, and temperature control zone 3 are illustrated as examples in the diagram). Detailed Implementation

[0026] 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.

[0027] See Figure 1 and Figure 2 This utility model provides an intelligent heating and shaping device for polytetrafluoroethylene (PTFE) film, mainly comprising a frame, an unwinding mechanism 1 installed at one end of the frame, a winding mechanism 2 installed at the other end of the frame, and a heating and shaping box 3 disposed between the unwinding mechanism 1 and the winding mechanism 2. The PTFE film 8, in its untreated roll form, is released from the unwinding mechanism 1, passes through the heating and shaping box 3 for heating and shaping, and is finally wound into a finished roll by the winding mechanism 2.

[0028] The heating and shaping chamber 3 is a box with good thermal insulation performance. Inside, there are several guide rollers 4a and heating rollers 4b for supporting and conveying the film 8. The film 8 passes around these rollers sequentially according to a predetermined path inside the chamber. The heating rollers 4b themselves can be heated, for example, by circulating heat transfer oil inside or by having built-in electric heating elements to provide contact heating for the film.

[0029] The core improvement in this embodiment lies in the intelligent heating system inside the heating and shaping box 3. For example... Figure 2 As shown, the internal space of the heating and shaping chamber 3, particularly above or below (or on both sides) the running path of the film 8, is divided along the width direction of the film into multiple independent temperature control zones (e.g., 3-8 independent temperature control zones). Each independent temperature control zone is equipped with at least one independent heating unit 5a and at least one temperature sensor 5b. The heating unit 5a can be an array of infrared heating lamps. Infrared heating has the advantages of rapid heating, easy control, and direct energy application to the film. The power supply of the infrared lamp array in each temperature zone can be independently adjusted by the controller 7.

[0030] Temperature sensor 5b preferably employs a non-contact infrared temperature probe, installed in an appropriate position, aligned with the surface of the thin film 8 passing below, to measure the actual temperature of the film within that temperature zone in real time. The measurement results for each temperature zone are fed back to controller 7.

[0031] A film state detection unit 6 is installed at the entrance of the heating and setting chamber 3 (i.e., before the film 8 enters the chamber). In this embodiment, the detection unit 6 can be an online multi-point thickness measuring instrument, for example, employing optical or capacitive principles, capable of real-time scanning or point-to-point measurement of the thickness distribution data of the film 8 along its width. The detection unit 6 may also include a tension sensor for measuring the tension value of the film when it enters the setting chamber. This detection data is transmitted to the controller 7 in real time.

[0032] The controller 7 is the core of the entire intelligent system, typically employing a PLC or industrial PC. Controller 7 receives real-time data from the film state detection unit 6 (such as thickness values ​​T1, T2, T3... or tension F at various width positions) and real-time temperature feedback (P1, P2, P3...) from temperature sensors 5b in each temperature zone within the heating and shaping chamber 3. Controller 7 has a pre-set target shaping temperature curve (which may not be perfectly flat along the width direction, depending on product requirements) and a control algorithm.

[0033] The controller 7 executes corresponding control strategies based on the thickness distribution data detected by the thin film state detection unit 6 and the temperature data fed back by the temperature sensors 5b in each temperature zone. When a larger film thickness is detected in a certain area, the controller 7 increases the power output of the heating unit 5a in the corresponding temperature control zone to ensure sufficient shaping; when a smaller film thickness is detected in a certain area, the controller reduces the corresponding heating power to avoid overheating. The controller 7 can also adjust the film running speed in coordination with the detected tension changes or average thickness changes to achieve intelligent optimization of the shaping process.

[0034] To further improve the temperature uniformity inside the chamber, a hot air circulation fan and air duct system (existing mature technology components) can be added inside the heating and shaping chamber 3 to assist in heat distribution through forced convection.

[0035] When the equipment is running, the operator only needs to set the target shaping temperature curve and related process parameters corresponding to the required product specifications on the human-machine interface of the controller 7, and the equipment can automatically complete the intelligent heating and shaping process.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A smart heating and shaping device for polytetrafluoroethylene (PTFE) film, comprising a frame, an unwinding mechanism (1) and a winding mechanism (2) mounted on the frame, and a heating and shaping box (3) located between the unwinding mechanism (1) and the winding mechanism (2), wherein the heating and shaping box (3) is provided with a plurality of guide rollers (4a) and heating rollers (4b) for guiding and heating the PTFE film, characterized in that: The heating and shaping chamber (3) is provided with at least two independent temperature control zones along the width direction of the film. Each independent temperature control zone is provided with at least one heating unit (5a) and at least one temperature sensor (5b). The device also includes: at least one film state detection unit (6), which is set before the entrance of the heating and shaping chamber (3) and is used to detect at least one physical parameter of the film to be shaped in real time; a controller (7), the signal input terminal of the controller (7) is electrically connected to the film state detection unit (6) and the temperature sensor (5b) of each independent temperature control zone respectively, and the signal output terminal of the controller (7) is electrically connected to the heating unit (5a) of each independent temperature control zone and is used to independently adjust the heating power of the heating unit (5a) in each independent temperature control zone according to the detected film physical parameters and temperature data.

2. The intelligent heating and shaping equipment for polytetrafluoroethylene film according to claim 1, characterized in that: The thin film state detection unit (6) includes a thin film thickness sensor for detecting the thickness distribution of the thin film along the width direction.

3. The intelligent heating and shaping equipment for polytetrafluoroethylene film according to claim 1, characterized in that: The thin film state detection unit (6) also includes a thin film tension sensor for detecting the real-time operating tension of the thin film.

4. The intelligent heating and shaping equipment for polytetrafluoroethylene film according to claim 1, characterized in that: The heating unit (5a) is an infrared heating lamp or a resistance heater.

5. The intelligent heating and shaping equipment for polytetrafluoroethylene film according to claim 1, characterized in that: The temperature sensor (5b) is a non-contact infrared temperature sensor used to detect the real-time temperature of the thin film surface within the corresponding temperature control zone.

6. The intelligent heating and shaping equipment for polytetrafluoroethylene film according to claim 1, characterized in that: The controller (7) is a programmable logic controller or an industrial control computer.

7. The intelligent heating and shaping equipment for polytetrafluoroethylene film according to claim 1, characterized in that: The controller (7) is also connected to the drive motor of the heating roller (4b) or the drive motor of the winding mechanism (2) for coordinating the adjustment of the film running speed according to the data of the film state detection unit (6).

8. The intelligent heating and shaping equipment for polytetrafluoroethylene film according to claim 1, characterized in that: The heating and shaping box (3) is also equipped with a hot air circulation device to help improve the uniformity of temperature inside the box.

9. The intelligent heating and shaping equipment for polytetrafluoroethylene film according to claim 2, characterized in that: The control logic of the controller (7) includes: when the thickness value of a certain width region of the film is detected by the film thickness sensor to be greater than the preset thickness value, the heating power of the independent temperature control zone corresponding to that region is increased; when the thickness value is detected to be less than the preset thickness value, the heating power of the corresponding independent temperature control zone is reduced.

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