A plastic film detection device and a detection method

Abstract

The application relates to a plastic film detection device in the field of film detection, which comprises a support, a detection table fixedly connected to the support; the detection table comprises a bearing plate, the middle part of the bearing plate is fixedly connected with a light response plate, air floating devices for blowing up the film are arranged on the two sides of the light response plate; the upper end of the support is provided with a detection frame matched with the detection table, the detection frame comprises a mounting frame, the middle part of the mounting frame is connected with a lifting device matched with the light response plate, the movable end of the lifting device is fixedly connected with a segmented detection unit, the two ends of the mounting frame are both provided with side adjusting frames, the lower end of each side adjusting frame is connected with a dynamic detection unit; the segmented detection unit comprises a sealed box, an electric push rod is arranged at the top end in the sealed box, a movable plate matched with the electric push rod is slidably connected in the sealed box, a sensor array is fixedly connected to the movable plate; the film can be conveniently and rapidly detected dynamically and accurately segmented, and the film is not prone to being abraded during the detection process.

Description

Technical Field

[0001] This invention relates to a plastic film testing device, and more particularly to a plastic film testing device and testing method applied in the field of film testing. Background Technology

[0002] Existing plastic film inspection devices are mainly used to detect the physical and optical properties of films, such as thickness, flatness, impurities, bubbles, and scratches. These devices typically include a light source, a camera, sensors, and a data processing unit. The light source provides stable illumination so that the camera can capture images of the film surface. The sensors are used to measure the film's thickness and physical defects. The data processing unit is responsible for analyzing the collected data to determine whether the film meets quality standards.

[0003] Some new inspection devices are integrating more advanced image processing technologies and machine learning algorithms to achieve faster and more accurate inspections. Some devices also employ automated robotic arms to improve inspection speed and reduce human error rates. Nevertheless, these improvements still require further optimization to meet the growing demands of industrial production.

[0004] Chinese invention patent CN113376330B discloses a plastic film testing device, including a testing box. The testing device provided by this invention can facilitate the testing of plastic films. Compared with ordinary inspection devices, the testing device provided by this invention has the advantages of assisting film transmission, avoiding film stretching, inspecting film defects, and facilitating the adjustment of the position of the testing sensor.

[0005] Chinese invention patent CN118225169B discloses a plastic film testing device and its testing method. The application is equipped with a testing component. During the testing process, the cooperation between the positioning shaft and the positioning block, as well as the cooperation between the rotating block and the through groove, effectively controls the movement of the testing plate, realizing intermittent sampling of the film toughness. Finally, under the action of the tension spring, the plate can quickly detach from the film after the test is completed without affecting the subsequent work.

[0006] Existing thin film testing devices suffer from low testing efficiency, are prone to thin film wear during testing, have limited testing methods, and lack sufficient automation. Summary of the Invention

[0007] The technical problem that this invention aims to solve in view of the above-mentioned prior art is that existing thin film detection devices have problems such as low detection efficiency, easy film wear during the detection process, single detection method, and insufficient automation.

[0008] To address the aforementioned problems, the present invention provides a plastic film testing device, comprising a support frame, on which a testing platform is fixedly connected; the testing platform includes a support plate, on which a photosensitive plate is fixedly connected, and on both sides of the photosensitive plate are air flotation devices for blowing up the film.

[0009] The upper end of the bracket is equipped with a testing frame that matches the testing table. The testing frame includes a mounting frame. A lifting device that matches the photosensitive plate is connected to the middle of the mounting frame. A segmented testing unit is fixedly connected to the movable end of the lifting device. Side adjustment frames are installed at both ends of the mounting frame. A dynamic testing unit is connected to the lower end of the side adjustment frames. Auxiliary testing plates for thin film testing are provided on both sides of the segmented testing unit in cooperation with the dynamic testing unit.

[0010] The segmented detection unit includes a sealed box, an electric push rod is installed at the top inside the sealed box, a movable plate matching the electric push rod is slidably connected inside the sealed box, and a sensor array is fixedly connected to the movable plate.

[0011] The dynamic detection unit includes an electric extension rod, with a fixed plate fixedly connected to the lower end of the electric extension rod, and a first laser ranging sensor fixedly connected to the fixed plate.

[0012] The aforementioned plastic film testing device and method facilitate dynamic and rapid testing and precise segmented testing of the film, and the film is not easily damaged during the testing process.

[0013] As a further improvement of this application, the air flotation device includes an air outlet plate, a monitoring plate fixedly connected to the air outlet plate, and an air pump communicating with the air outlet plate and the monitoring plate installed inside the support plate; an airflow sensor and a distance sensor are installed at one end of the monitoring plate opposite to the air outlet plate.

[0014] As a further improvement to this application, a pair of air flotation tube assemblies are installed on the testing platform. The air flotation tube assemblies include multiple nozzles, and multiple evenly distributed nozzles are provided on the nozzles.

[0015] As a further improvement of this application, the bracket is equipped with an electric guide rail that matches the winding device, and the two winding devices move synchronously when the pair of electric guide rails are working.

[0016] As another improvement of this application, the photosensitive plate includes a negative pressure adsorption frame that matches the segmented detection unit. A light-transmitting plate is installed in the middle of the negative pressure adsorption frame, and a first photosensitive sensor and a laser displacement sensor arranged in an array are installed inside the light-transmitting plate.

[0017] As a further improvement to this application, an auxiliary detection plate is embedded in the air flotation tube assembly. The auxiliary detection plate includes a light-transmitting plate, in which a second photosensor and a second laser rangefinder are installed.

[0018] As a further improvement to this application, an auxiliary system is also included, which includes a processor and a control module, a data processing module, a detection module and a data storage module connected to the processor.

[0019] The control module controls the designated device to work according to the control signal or preset program. The device includes a winding device, an air flotation device, a segmented detection unit and a dynamic detection unit.

[0020] The detection module is used to collect detection data when the detection device is working. The detection data includes the stability of the output airflow of the air flotation device and air flotation tube group, as well as the detection data of the segmented detection unit and the dynamic detection unit.

[0021] The data processing module is used to process and analyze the test data to obtain the film thickness and transmittance data. The data processing module uses a preset algorithm to process the test data and obtain the film quality assessment results.

[0022] The data storage module is used to store all data generated during the detection process.

[0023] A detection method for a plastic film detection device specifically includes the following steps:

[0024] A1. By controlling a pair of winding devices, the film is brought into the detection stage. Then, depending on the detection mode, the air flotation device or air flotation tube group is selected to work. In dynamic detection mode, multiple air flotation tube groups work. In segmented detection mode, the air flotation device works intermittently.

[0025] A2, the film is detected by a segmented detection unit or a dynamic detection unit during the movement of the detection stage;

[0026] A21, in dynamic detection mode, a pair of winding devices wind and unwind the film at a set speed, causing the film to move along the detection table. During the movement, the film thickness and light transmittance are roughly detected by the dynamic detection unit.

[0027] The thin film thickness data is fed back to the servo motor group in real time. When the thin film thickness fluctuation is greater than the maximum set value, the position of the sensor array and the first laser rangefinder sensor is adjusted so that the distance between them and the thin film is kept within the set range during operation. Then, the working mode is the segmented detection mode, and the detected thin film fluctuation area is segmented for detection.

[0028] A22, in segmented detection mode, a pair of winding devices wind and unwind the film at a set time interval and a set speed, so that each segment of the film is matched with the segmented detection unit in sequence. The segmented detection unit performs detailed inspection of the light transmittance and thickness of the film segments.

[0029] A3, the testing station automatically adjusts the film state according to the testing requirements, and then sets the testing mode to repeat the above film testing work.

[0030] In summary, this solution achieves high-precision and high-efficiency detection of the light transmittance and thickness of plastic films. It also facilitates automatic switching between dynamic and static segmented detection during the testing process, and the film is not easily worn when it moves during inspection. Attached Figure Description

[0031] Figure 1 This is a perspective view of the detection device according to the first embodiment of this application;

[0032] Figure 2 This is a side cross-sectional view of the detection device according to the first embodiment of this application;

[0033] Figure 3 for Figure 2 Schematic diagram of the structure at point A;

[0034] Figure 4 for Figure 2 Schematic diagram of the structure at point B;

[0035] Figure 5 This is a side view of the detection device according to the first embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the local state of the thin film during segmented detection by the detection device according to the first embodiment of this application;

[0037] Figure 7 This is a system block diagram of the second embodiment of this application;

[0038] Figure 8 This is a flowchart illustrating the usage method of the third embodiment of this application.

[0039] Explanation of the labels in the diagram:

[0040] 1. Support frame; 11. Winding device; 12. Electric guide rail; 2. Testing table; 21. Bearing plate; 22. Photosensitive plate; 23. Air flotation device; 231. Air outlet plate; 232. Monitoring plate; 24. Air flotation tube assembly; 3. Testing frame; 31. Mounting frame; 32. Lifting device; 33. Side adjustment frame; 4. Segmented testing unit; 41. Sealed box; 42. Electric push rod; 43. Movable plate; 44. Sensor array; 5. Dynamic testing unit; 51. Electric extension rod; 52. Fixed plate; 53. First laser rangefinder sensor; 6. Auxiliary testing plate. Detailed Implementation

[0041] The three embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0042] Implementation method 1:

[0043] Figures 1-3As shown, a plastic film detection device includes a bracket 1, on which a detection platform 2 is fixedly connected; an electric guide rail 12 matching a winding device 11 is installed on the bracket 1, and the two winding devices 11 move synchronously when the pair of electric guide rails 12 are working.

[0044] The testing station 2 includes a support plate 21, a photosensitive plate 22 is fixedly connected to the middle of the support plate 21, and air flotation devices 23 for blowing up the film are provided on both sides of the photosensitive plate 22. The air flotation devices 23 are used to blow up the plastic film with airflow, so that the plastic film is less likely to rub against the air flotation devices 23 when it is pulled and moved.

[0045] The photosensitive plate 22 includes a negative pressure adsorption frame that matches the segmented detection unit 4. A light-transmitting plate is installed in the middle of the negative pressure adsorption frame. A first photosensitive sensor and a laser displacement sensor are installed in an array inside the light-transmitting plate. The negative pressure adsorption frame generates negative pressure during detection by connecting an air pump, so that the film is locally adsorbed on the surface of the light-transmitting plate 22 to maintain stability.

[0046] The air flotation device 23 includes an air outlet plate 231, a monitoring plate 232 fixedly connected to the air outlet plate 231, and an air pump connected to the air outlet plate 231 and the monitoring plate 232 installed inside the support plate 21. An airflow sensor and a distance sensor are installed at one end of the monitoring plate 232 relative to the air outlet plate 231. The distance sensor is used to detect the distance between the membrane and the monitoring plate 232, and the airflow sensor is used to detect the airflow velocity blowing towards the monitoring plate 232. When the detected airflow velocity is greater than a set value, it is determined that the membrane is damaged.

[0047] The air outlet plate 231 is used to blow air to lift the film, and the monitoring plate 232 is used to monitor whether the floating height of the film is too high; the air flotation device 23 is used to create a suspension gap in the film when it moves, thereby reducing frictional damage between the film and the detection surface.

[0048] A pair of air flotation tube assemblies 24 are installed on the testing station 2. The air flotation tube assembly 24 includes multiple nozzles, and multiple evenly distributed nozzles are provided on the nozzles.

[0049] The air pump selected by those skilled in the art shall be installed so that the air pump can supply a stable airflow to the air flotation device 23 and the air flotation tube assembly 24.

[0050] The upper end of the bracket 1 is equipped with a testing frame 3 that matches the testing table 2. The testing frame 3 includes a mounting frame 31. The middle part of the mounting frame 31 is connected to a lifting device 32 that matches the photosensitive plate 22. A segmented testing unit 4 is fixedly connected to the movable end of the lifting device 32. Side adjustment frames 33 are installed at both ends of the mounting frame 31. A dynamic testing unit 5 is connected to the lower end of the side adjustment frame 33. Auxiliary testing plates 6 are provided on both sides of the segmented testing unit 4 to cooperate with the dynamic testing unit 5 for thin film testing.

[0051] The segmented detection unit 4 includes a sealed box 41, an electric push rod 42 is installed at the top of the sealed box 41, a movable plate 43 matching the electric push rod 42 is slidably connected inside the sealed box 41, and a sensor array 44 is fixedly connected on the movable plate 43; the sensor array 44 includes laser sensors and a light source generator arranged in an array; the laser sensors are used to detect the distance between the sensor array 44 and the thin film.

[0052] When the segmented detection unit 4 is working, the electric push rod 42 first adjusts the position of the movable plate 43 so that the sensor array 44 maintains a set distance relative to the film, so as to avoid the light source being too close to the film during light transmittance detection.

[0053] The segmented detection unit 4 is used for static detection of the film. When the segmented detection unit 4 is working, the film is pressed against the sealed box 41 under the action of the air flotation device 23. Then, the distance between the sensor array 44 and the film is adjusted by the electric push rod 42. Then, the light transmittance and thickness are detected by the sensor array 44 and the photosensitive plate 22.

[0054] The light source generator in the sensor array 44 works with the first photosensitive sensor to detect the light transmittance of the thin film, and the laser displacement sensor works with the laser sensor to detect the thickness of the thin film.

[0055] The segmented detection unit 4 is used to detect a large range of segments of the film, and performs static detection through the sensor array 44. The detection results are more accurate than when the film is in motion; and the detection range is large, making it easy to detect the uniform thickness of the film segments.

[0056] When the segmented detection unit 4 is working, a pair of air flotation devices 23 work, causing the films on both sides of the segmented detection unit 4 to float up and stick to the lower end face of the sealing box 41. Compared with the sealing box 41 pressing down to seal the upper space of the film, the method of blowing the film up to seal the bottom of the sealing box 41 by airflow causes less damage to the film.

[0057] The dynamic detection unit 5 includes an electric extension rod 51, the lower end of which is fixedly connected to a fixing plate 52, and a first laser ranging sensor 53 is fixedly connected to the fixing plate 52; the dynamic detection unit 5 is used for dynamic detection of the film; the auxiliary detection plate 6 is embedded in the air-float tube assembly 24, and the auxiliary detection plate 6 includes a light-transmitting plate, in which a second photosensor and a second laser ranging sensor are installed; the first laser ranging sensor 53 and the second laser ranging sensor are arranged in pairs.

[0058] The dynamic detection unit 5 performs detection while the film is in motion, which makes it easy to detect the film thickness at various points. The detection is continuous and fast. When the film thickness fluctuates, the segmented detection unit 4 can be switched to perform detection.

[0059] This solution uses dynamic detection unit 5 to perform dynamic thickness detection and preliminary light transmittance detection on the film, and segmented detection unit 4 to perform detailed light transmittance detection and overall segmented thickness detection on the film. During the detection process, the film is blown up by air flotation device 23 and air flotation tube group 24, so that the film is less likely to come into contact with external components when it is being detected by dynamic detection unit 5 and segmented detection unit 4, thus avoiding film wear.

[0060] The second implementation method:

[0061] Figure 7 As shown, the detection device also includes an auxiliary system, which includes a processor and a control module, a data processing module, a detection module and a data storage module connected to the processor;

[0062] The control module controls the designated device to work according to the control signal or preset program. The device includes a winding device 11, an air flotation device 23, a segmented detection unit 4, and a dynamic detection unit 5. The control module issues instructions to coordinate the work of each module and ensure that the detection process is carried out according to the preset program.

[0063] The detection module is used to collect detection data when the detection device is working. The detection data includes the stability of the airflow output by the air flotation device 23 and the air flotation tube group 24, and the detection data of the segmented detection unit 4 and the dynamic detection unit 5.

[0064] The data processing module is used to process and analyze the test data to obtain the film thickness and transmittance data. The data processing module uses a preset algorithm to process the test data and obtain the film quality assessment results.

[0065] The data storage module is used to store all data generated during the testing process, including raw testing data, processed data, and testing results; this data can be used for subsequent quality traceability and analysis.

[0066] The auxiliary system in this embodiment is used to assist the detection device in automating the detection of thin films.

[0067] The third implementation method:

[0068] Figure 8 The following is a method for detecting plastic film using a detection device, and the specific working process is as follows:

[0069] A1. By controlling a pair of winding devices 11, the film is brought onto the detection stage 2. Then, according to the detection mode, the air flotation device 23 or the air flotation tube group 24 is selected to work. In the dynamic detection mode, multiple air flotation tube groups 24 work. In the segmented detection mode, the air flotation device 23 works intermittently.

[0070] A2, the film is detected by segmented detection unit 4 or dynamic detection unit 5 during the movement of the detection stage 2;

[0071] A21, in dynamic detection mode, a pair of winding devices 11 wind up and unwind the film at a set speed, so that the film moves along the detection table 2. During the movement, the film is subjected to thickness detection and light transmittance rough inspection by the dynamic detection unit 5.

[0072] The first laser ranging sensor 53 at the top emits a laser beam that is directed perpendicularly to the upper surface of the film. After reflection, the distance H1 from the sensor to the upper surface is calculated. Similarly, the distance H2 from the second laser ranging sensor at the bottom to the lower surface is calculated. The vertical distance H between the two sensors is known, and the detected film thickness t is determined by the following formula: t = H - (H1 + H2).

[0073] Real-time feedback of film thickness detection data to the servo motor group; when the film thickness fluctuation exceeds the maximum set value; adjust the position of sensor array 44 and first laser rangefinder 53 so that the distance between them and the film is kept within the set range during operation; then switch to segmented detection mode and perform segmented detection on the film fluctuation area detected above.

[0074] Optionally, when switching from the above method to the segmented detection mode, the segmented detection unit 4 will resume the dynamic detection mode after completing the detection of the thin film fluctuation area;

[0075] A22, in segmented detection mode, a pair of winding devices 11 wind up and unwind the film at a set time interval and a set speed, so that each segment of the film is matched with the segmented detection unit 4 in sequence, and the segmented detection unit 4 performs detailed inspection of the light transmittance and thickness of the film segments.

[0076] A3, the testing station 2 automatically adjusts the film state according to the testing requirements, and then sets the testing mode to repeat the above film testing work.

[0077] Specifically, when adjusting the film state, the electric guide rail 12 is driven to work, causing the winding device 11 to move, thereby stretching the film on the detection table 2, thus realizing the detection of the film stretching state.

[0078] The dynamic detection mode of this solution is suitable for rapid detection of thin films. During the detection process, the air flotation device 23, the air flotation tube group 24 or a combination of both are controlled to make the air flotation device 23 or the air flotation tube group 24 output a uniform airflow to make the thin film float, avoiding contact between the thin film and the auxiliary detection plate 6 or the photosensitive plate 22 during the movement of the thin film.

[0079] When the dynamic detection mode is working, the winding device 11 works to continuously drive the film displacement. At this time, the first laser range sensor 53 and the second laser range sensor cooperate to detect the thickness of the film.

[0080] During the operation of the dynamic detection mode, those skilled in the art can adjust the operation of the dynamic detection mode according to the actual situation. For example, if the film thickness fluctuation value is detected to exceed the warning threshold, the dynamic detection mode is adjusted as follows: the traction film movement is paused, and then the air pump is controlled to work, so that a negative pressure is formed at the negative pressure adsorption frame on the photosensitive plate 22 and the film is adsorbed. At this time, the lifting device 32 is controlled to lower the segment detection unit 4 by a set distance until the sealing box 41 is in contact with the film adsorbed on the photosensitive plate 22. At this time, the segment detection unit 4 seals the space above the film segment, and then the sensor array 44 is controlled to work and collect the detection data of the first photosensitive sensor and the laser displacement sensor in the photosensitive plate 22, thereby obtaining the light transmittance data of the film segment. This adjustment method is used to temporarily detect part of the segment during the operation of the dynamic detection mode. Compared with the segment detection mode, when the sealing box 41 is in contact with the film adsorbed on the photosensitive plate 22, it will exert pressure on the film, which can easily lead to damage to the film surface.

[0081] The detection method of this embodiment achieves high-precision and high-efficiency light transmittance detection of specific films during dynamic detection, and facilitates automatic switching between dynamic detection and segmented detection during the detection process. By adjusting the dynamic detection mode, the movement of the film is paused, and the film is stably adsorbed using a negative pressure adsorption frame, ensuring that the segmented detection unit can accurately adhere to the film, thereby avoiding errors caused by film movement or positional changes during detection. Simultaneously, by controlling the operation of the sensor array, detection data from the first photosensitive sensor and the laser displacement sensor can be quickly acquired, thereby accurately calculating the light transmittance data of the film segments. This method not only improves the accuracy of detection but also enables real-time monitoring of film quality without affecting overall production efficiency, ensuring the stability and consistency of product quality. The automatic switching between dynamic detection and segmented detection easily solves the problems of low detection efficiency and film wear, and the seamless switching between the two detection modes reduces downtime.

[0082] In summary, this solution achieves high-precision and high-efficiency detection of the light transmittance and thickness of plastic films, and facilitates automatic switching between dynamic and static segmented detection during the detection process. Furthermore, the film is not easily worn when it moves during the detection process.

[0083] In light of current practical needs, the above-described embodiments adopted in this application are not limited to this scope of protection. Various changes made within the knowledge of those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A plastic film testing device, comprising a support (1), wherein a testing platform (2) is fixedly connected to the support (1), and the support (1) includes winding devices (11) disposed on both sides of the testing platform (2); characterized in that: The testing station (2) includes a support plate (21), a photosensitive plate (22) is fixedly connected to the middle of the support plate (21), and air flotation devices (23) for blowing up the film are provided on both sides of the photosensitive plate (22). The upper end of the bracket (1) is equipped with a testing frame (3) that matches the testing table (2). The testing frame (3) includes a mounting frame (31). The middle part of the mounting frame (31) is connected to a lifting device (32) that matches the photosensitive plate (22). A segmented testing unit (4) is fixedly connected to the movable end of the lifting device (32). Both ends of the mounting frame (31) are equipped with side adjustment frames (33). The lower end of the side adjustment frame (33) is connected to a dynamic testing unit (5). The two sides of the segmented testing unit (4) are provided with auxiliary testing plates (6) that cooperate with the dynamic testing unit (5) to perform thin film testing. The segmented detection unit (4) includes a sealed box (41), an electric push rod (42) is installed at the top of the sealed box (41), a movable plate (43) matching the electric push rod (42) is slidably connected inside the sealed box (41), and a sensor array (44) is fixedly connected on the movable plate (43). The dynamic detection unit (5) includes an electric extension rod (51), the lower end of which is fixedly connected to a fixing plate (52), and a first laser ranging sensor (53) is fixedly connected to the fixing plate (52); the segmented detection unit (4) is used for static detection of the film. When the segmented detection unit (4) is working, the film is pressed against the sealing box (41) under the action of the air flotation device (23), and then the distance between the sensor array (44) and the film is adjusted by the electric push rod (42), and then the light transmittance and thickness are detected by the sensor array (44) and the photosensitive plate (22).

2. The plastic film detection device according to claim 1, characterized in that: The air flotation device (23) includes an air outlet plate (231), a monitoring plate (232) is fixedly connected to the air outlet plate (231), and an air pump communicating with the air outlet plate (231) and the monitoring plate (232) is installed in the bearing plate (21); an airflow sensor and a distance sensor are installed on one end of the monitoring plate (232) opposite to the air outlet plate (231).

3. The plastic film detection device according to claim 2, characterized in that: The testing platform (2) is equipped with a pair of air flotation tube groups (24), which include multiple nozzles and multiple evenly distributed nozzles.

4. The plastic film detection device according to claim 3, characterized in that: The bracket (1) is equipped with an electric guide rail (12) that matches the winding device (11). When the pair of electric guide rails (12) are working, the two winding devices (11) move synchronously.

5. A plastic film detection device according to claim 4, characterized in that: The photosensitive plate (22) includes a negative pressure adsorption frame that matches the segmented detection unit (4). A light-transmitting plate is installed in the middle of the negative pressure adsorption frame. A first photosensitive sensor and a laser displacement sensor are installed in an array inside the light-transmitting plate.

6. The plastic film detection device according to claim 5, characterized in that: The auxiliary detection plate (6) is embedded in the air flotation tube assembly (24). The auxiliary detection plate (6) includes a light-transmitting plate, and a second photosensitive sensor and a second laser ranging sensor are installed in the light-transmitting plate.

7. A plastic film detection device according to claim 6, characterized in that: It also includes an auxiliary system, which includes a processor and is connected to a control module, a data processing module, a detection module and a data storage module; The control module controls the designated device to work according to the control signal or preset program. The device includes a winding device, an air flotation device, a segmented detection unit and a dynamic detection unit. The detection module is used to collect detection data when the detection device is working. The detection data includes the stability of the airflow output by the air flotation device (23) and the air flotation tube group (24), and the detection data of the segmented detection unit (4) and the dynamic detection unit (5). The data processing module is used to process and analyze the detection data to obtain the thickness data and light transmittance data of the film. The data processing module uses a preset algorithm to process the detection data to obtain the quality assessment results of the film. The data storage module is used to store all data generated during the detection process.

8. A detection method applied to the plastic film detection device of claim 7, characterized in that: Specifically, the following steps are included: A1, by controlling a pair of winding devices (11) to bring the film into the detection table (2), and then according to the detection mode, select the air flotation device (23) or the air flotation tube group (24) to work; in the dynamic detection mode, multiple air flotation tube groups (24) work; in the segmented detection mode, the air flotation device (23) works intermittently. A2, the film is detected by segmented detection unit (4) or dynamic detection unit (5) during the movement of the detection stage (2); A21, in dynamic detection mode, a pair of winding devices (11) wind up and unwind the film at a set speed, so that the film moves along the detection table (2). During the movement, the film thickness is detected and the light transmittance is roughly detected by the dynamic detection unit (5). Real-time feedback of film thickness detection data to servo motor group. When film thickness fluctuation is greater than the maximum set value, adjust the position of sensor array (44) and first laser ranging sensor (53) so that the distance between them and the film is kept within the set range when they work. Then the working mode is segmented detection mode and the film fluctuation area detected above is segmented detection. A22, in the segmented detection mode, a pair of winding devices (11) wind up and unwind the film at a set rotation speed at a set time interval, so that each segment of the film is matched with the segmented detection unit (4) in sequence, and the segmented detection unit (4) performs light transmittance and thickness detection on the film segments. A3, the testing station (2) automatically adjusts the film state according to the testing requirements, and then sets the testing mode to repeat the above film testing work.

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