A polarizing sheet layer peeling detection apparatus and method

Abstract

The present application relates to polarizing plate test technical field, disclose a kind of polarizing plate each layer peeling detection equipment and method thereof, its equipment includes equipment table, input unit, preheating unit, transfer unit, arch forming unit, peeling test unit, reinspection unit and output unit, above-mentioned unit is arranged on equipment table, in turn according to polarizing plate detection process, from one side input the polarizing plate to be detected, the other side output after detection polarizing plate;Input unit inputs the polarizing plate to be detected, and using preheating unit is heated to its upper and lower layer evenly, using transfer unit is transferred to arch forming unit and is detected.The present application is integrated by functional unit design, realizes full-automatic detection process, improves detection efficiency, arch forming process makes polarizing plate each layer natural separation, cooperate three-axis precision positioning system to reach precision control, ensure that peeling angle is always same, make peeling force test precision, position precision high.

Description

Technical Field

[0001] This invention relates to the field of polarizer testing, and more specifically, to a device and method for detecting the peeling of different layers of a polarizer. Background Technology

[0002] Polarizing film is one of the core optical components of a liquid crystal display (LCD). It is typically composed of multiple layers of thin film materials, including a polyvinyl alcohol (PVA) polarizing layer, a cellulose triacetate (TAC) protective film, and a pressure-sensitive adhesive layer. The bonding strength between the layers of the polarizing film directly affects the optical performance, lifespan, and reliability of the display. Therefore, testing the peel strength of each layer of the polarizing film is a crucial step in quality control.

[0003] With the continuous development of display technology, the requirements for the quality of polarizers are becoming increasingly stringent. Existing polarizer layer peeling detection technologies suffer from problems such as low detection accuracy, poor consistency, low automation, and low detection efficiency. These problems are mainly manifested in the following ways: manual inspection is highly subjective and labor-intensive; existing equipment suffers from uneven temperature control, unreasonable molding processes, and a lack of multi-axis precision positioning systems; the detection process is incomplete, lacking automatic quality inspection and sorting functions; and the equipment has low integration and outdated control systems, making it difficult to meet the needs of modern mass production. Summary of the Invention

[0004] This invention provides a polarizer layer peeling detection device and method, which solves the technical problem that existing technologies cannot achieve integrated, automated, and high-precision polarizer layer peeling detection devices, and realizes the full-process automated detection from pretreatment, forming, peeling test to quality inspection.

[0005] This invention provides a polarizer peeling test device, including a device platform, an input unit, a preheating unit, a transfer unit, an arch forming unit, a peeling test unit, a re-inspection unit, and an output unit. All of the above units are set on the device platform and arranged in sequence according to the polarizer test process flow. The polarizer to be tested is input from one side and the tested polarizer is output from the other side.

[0006] The input unit inputs the polarizer to be tested, and the preheating unit heats its upper and lower layers evenly. The transfer unit transfers it to the arch forming unit to be extruded into an arch shape for layering and testing.

[0007] The arch forming unit includes a support platform, which is fixed on the equipment platform. An electric heating tube is embedded in the support platform. Roller moving parts are installed on both sides of the support platform. Two sets of extrusion rollers are installed on the roller moving parts. A pressure sensor is embedded in the bearing seat of each extrusion roller.

[0008] The peeling test unit includes a three-axis displacement platform. The peeling fixture is installed on the moving end of the transverse slide rail of the three-axis displacement platform. A tension sensor is installed at the clamping end of the peeling fixture. The three-axis displacement platform maintains a relative positional relationship with the arch forming unit by adjustment.

[0009] After the polarizer is stripped and tested, it is re-inspected by the re-inspection unit and then output through the transfer unit.

[0010] Furthermore, the input unit adopts a non-adhesive conveyor belt structure, and photoelectric sensors are installed on the frame on both sides of the non-adhesive conveyor belt.

[0011] Furthermore, the upper part of the preheating unit uses an aluminum alloy heating plate, which is mounted on a support frame above the input unit. The lower part of the preheating unit uses a flexible heating film, which is attached to the outer surface of the non-stick conveyor belt.

[0012] Furthermore, the transfer unit adopts a three-station vacuum suction cup system, which includes a three-station suction cup frame, a three-station moving slide rail, and vacuum suction cups. The three-station suction cup frame is installed on the moving end of the three-station moving slide rail, and the vacuum suction cups are located at the three stations of the three-station suction cup frame.

[0013] Furthermore, the roller moving parts are driven by a servo motor through a reducer and a ball screw to drive the extrusion roller, and the surface of the extrusion roller is plated with hard chrome.

[0014] Furthermore, a displacement sensor is installed on one side of the peeling fixture. The displacement sensor is used to locate the central axis of the film in the polarizer.

[0015] Furthermore, the re-inspection unit is used to inspect the surface quality of the polarizer after stripping. It includes a re-inspection table made of black anodized aluminum alloy. The re-inspection table is mounted on the equipment platform by adjusting the support legs. A vacuum adsorption system is set below the re-inspection table for positioning the polarizer. The re-inspection probe is mounted above the re-inspection table.

[0016] Furthermore, ring light sources are installed on both sides of the re-inspection table, with the ring light sources forming a 45° angle with the table surface.

[0017] Furthermore, the output unit also uses a non-stick conveyor belt, which is installed on the frame of the equipment platform. Two collection boxes are set at the end of the conveyor belt, which are used to collect qualified products and unqualified products respectively.

[0018] This invention also proposes a method for detecting the peeling of different layers of a polarizer, comprising the following steps:

[0019] The polarizer to be tested enters the equipment via a non-stick conveyor belt from the input unit;

[0020] The preheating unit heats the material evenly until the set temperature is reached.

[0021] The vacuum chuck of the transfer unit transfers the heated polarizer to the arch forming unit;

[0022] The arch-forming unit compresses the polarizer into an arch shape, separating the layers;

[0023] The peel test unit clamps the membrane for peel strength testing;

[0024] The re-inspection unit checks the surface quality of the polarizer after stripping.

[0025] Qualified and unqualified products are sent to different collection boxes.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention achieves a fully automated testing process through the integrated design of seven functional units, improving testing efficiency. The arching molding process allows the layers of the polarizer to separate naturally, and the three-axis precision positioning system enables precise control to ensure that the peeling angle is always the same, resulting in high accuracy in peeling force testing and positional accuracy. The integrated machine vision inspection and automatic sorting functions enable intelligent evaluation and classification of product quality, providing an advanced quality inspection solution for the polarizer industry. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a polarizer layer peeling detection device according to the present invention;

[0029] Figure 2 This is the invention Figure 1 A schematic diagram of the unit combination structure on the equipment platform;

[0030] Figure 3 This is the invention Figure 2 The main view;

[0031] Figure 4 This is the invention Figure 3 A schematic diagram of the structure of the arch-forming unit extruding the polarizer to be tested;

[0032] Figure 5 This is the invention Figure 2 A schematic diagram of the structure of the peel test unit in the diagram;

[0033] Figure 6 This is the invention Figure 5 Side view.

[0034] In the diagram: 100, Equipment platform; 200, Input unit; 300, Preheating unit; 400, Peeling test unit; 410, Peeling fixture; 420, Three-axis displacement platform; 421, Transverse slide rail; 422, Vertical slide rail; 423, Longitudinal slide rail; 500, Arch forming unit; 510, Bearing platform; 520, Extrusion roller; 600, Transfer unit; 610, Three-station suction cup frame; 620, Vacuum suction cup; 700, Polarizing film to be tested; 800, Re-inspection unit. Detailed Implementation

[0035] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0036] like Figures 1-6 As shown, a polarizer peeling test device includes seven main functional units: an input unit 200, a preheating unit 300, a transfer unit 600, an arch forming unit 500, a peeling test unit 400, a re-inspection unit 800, and an output unit. The input unit 200, preheating unit 300, transfer unit 600, arch forming unit 500, peeling test unit 400, re-inspection unit 800, and output unit are all located on a device platform 100. The units on the device platform 100 are arranged sequentially according to the polarizer testing process. The polarizer to be tested 700 is input from one side, and the tested polarizer is output from the other side, forming a complete automated testing production line to realize the peeling test of the polarizer.

[0037] The input unit 200 adopts a non-adhesive conveyor belt structure. The conveyor belt body, made of polytetrafluoroethylene (PTFE), is fixed to the frame of the equipment platform 100 by tensioning wheels and spring tensioning mechanisms. The drive end of the conveyor belt is connected to a servo motor with a power of 0.5-1.0kW. The motor drives the conveyor belt through a reducer and a drive roller. The driven end of the conveyor belt is equipped with a driven roller and a tensioning device. Multiple guide wheels are distributed along the conveyor belt path to ensure accurate running trajectory. Photoelectric sensors are installed on the frame on both sides of the conveyor belt to detect the position and size of the polarizer. Laser displacement sensors are also installed on both sides of the middle section of the conveyor belt as edge detectors. All sensors are connected to the PLC controller in the control cabinet through signal lines. The encoder feedback line and power line of the servo motor are also connected to the control cabinet. The support frame of the entire conveyor belt system is fixed to the workshop floor with anchor bolts.

[0038] The preheating unit 300 is located at the end of the input unit 200 and adopts a dual heating structure. The aluminum alloy heating plate of the upper preheating unit is installed on the support frame above the input unit 200 through a cylinder-driven lifting mechanism. Ceramic heating elements are embedded inside the heating plate and connected to the temperature controller via cables. The temperature controller uses PID control and monitors the temperature in real time through a PT100 platinum resistance temperature sensor. The flexible heating film of the lower heating system is directly attached to the outer surface of the non-adhesive conveyor belt. The power cord of the heating film and the temperature sensor cable are connected to the control cabinet through a dedicated drag chain system. Insulation material is installed in the conveyor belt support structure below the heating film to reduce heat loss. The temperature controllers of both the upper and lower heating systems are integrated in the main control cabinet and communicate with the PLC controller via a fieldbus. The air supply pipeline of the cylinder is connected to the compressed air system of the equipment. The mechanical structure of the entire preheating unit 300 is fixed to the discharge end of the input unit 200 by bolts.

[0039] The transfer unit 600 employs a three-station vacuum suction cup 620 system. The three-station suction cup frame 610 of the aluminum profile frame in the three-station vacuum suction cup 620 system is mounted on a three-station moving slide rail via linear guide rails. The slide rail is driven by a servo motor connected to a ball screw via a coupling. Each station's lifting slide rail is fixed to the suction cup frame via a flange. The moving end of the lifting slide rail is equipped with a vacuum suction cup 620, which is connected to a vacuum pump via a polyurethane hose. A solenoid valve is installed in the pipeline to control the vacuum's on / off state. The vacuum pump is installed in a cabinet at the bottom of the equipment. All pneumatic pipelines are connected via quick-connect couplings and routed along the inside of the frame. The servo motor's power line and encoder line are connected to the servo driver in the control cabinet via a drag chain. The cylinder air source pipeline of the lifting mechanism is also connected to the compressed air system. The entire transfer unit 600's guide rail support frame is fixed to the main equipment frame with high-strength bolts. Precise mechanical positioning pins ensure positional accuracy between the transfer unit 600 and the preheating unit 300 and the arch forming unit 500.

[0040] like Figure 4As shown, the arch forming unit 500 is the core component of the equipment. The 304 stainless steel support platform 510 is fixed to the main frame of the equipment by adjusting bolts. An electric heating element is embedded in the inner wall of the bottom of the support platform 510 and connected to a temperature controller via a high-temperature resistant cable. Multiple PT100 temperature sensors are distributed at different locations inside the support platform 510 and connected to the temperature control terminal via compensating wires. Roller moving parts are installed on precision linear guides on both sides of the support platform 510. Each roller moving part is driven by a servo motor through a reducer and a ball screw. Two roller moving parts are mounted on each roller moving part. The extrusion rollers 520 are assembled, and each extrusion roller 520 has a piezoresistive pressure sensor embedded in its bearing housing. The sensor signal line is connected to the data acquisition terminal through a shielded cable. The surface of the extrusion rollers 520 is hard chrome plated to improve wear resistance. The heating system of the arch forming unit 500 achieves constant temperature control through a PID temperature controller. All electrical connections use industrial-grade connectors and are protected by wire grooves. The servo drive of the roller moving parts is installed in the control cabinet and communicates with the main controller through a fieldbus. The support platform 510 is surrounded by aluminum silicate fiber insulation material to reduce heat loss.

[0041] The peeling test unit 400 adopts a three-axis displacement platform 420 structure. The precision ball linear guide of the longitudinal slide rail 423 (Y-axis) is fixed to the frame of the equipment platform 100 via a support base. The slider on the guide rail is connected to a ball screw driven by a servo motor via a coupling. The vertical slide rail 422 (Z-axis) is vertically mounted on the moving platform of the longitudinal slide rail 423, and the transverse slide rail 421 (X-axis) is horizontally mounted on the moving end of the vertical slide rail 422. All three axes are driven by servo motors and ball screws. A titanium alloy peeling fixture 410 is mounted on the moving end of the transverse slide rail 421. The peeling fixture 410 contains... The pneumatic clamping mechanism of the unit is connected to the compressed air system through an air pipe. The S-type tension sensor is directly installed at the clamping end of the peeling fixture 410. The sensor signal line is connected to the signal amplifier through a high-flexibility cable. The laser displacement sensor is installed on one side of the peeling fixture 410 as a positioning sensor to position the central axis of the film. The encoder feedback lines and power lines of all servo motors are connected to the multi-axis motion controller in the control cabinet through a drag chain system. The controller supports linear interpolation and circular interpolation functions to achieve composite motion trajectories. The mechanical structure of the entire three-axis platform is connected by high-precision bolts and maintains a precise relative positional relationship with the arch forming unit 500. The 420 system of the three-axis displacement platform (X, Y, Z axes) combined with laser displacement sensors provides precise positioning, ensuring that the angle and position of each peeling are completely consistent. The S-shaped tension sensor measures the peeling force at a fixed angle, avoiding the influence of angle changes on force value decomposition. The testing accuracy is higher than that of traditional methods. The multi-axis motion controller supports linear interpolation and circular interpolation, ensuring a high degree of consistency in the peeling trajectory. A large amount of test data at the same angle can establish reliable quality standards and control limits. After eliminating angle variables, the trend of material performance changes and process stability can be analyzed more accurately.

[0042] The re-inspection unit 800 is used to inspect the surface quality of the polarizer after stripping. The black anodized aluminum alloy re-inspection table is mounted on the frame of the equipment table 100 via adjustable legs. The table surface is treated with matte finish to reduce reflective interference. A vacuum adsorption system is installed below the table surface for polarizer positioning. A high-resolution CCD industrial camera, serving as the re-inspection probe, is mounted above the re-inspection table via a precision lifting mechanism. The camera is equipped with a 25mm fixed-focus lens and an autofocus system. The lifting mechanism is driven by a stepper motor via a ball screw. Two sets of LED ring light sources are installed on both sides of the re-inspection table, forming a 45° angle with the table surface. The light sources are fixed by adjustable brackets and connected to LED drivers via cables. The drivers have brightness adjustment functions. The image signal from the CCD camera is connected to the image acquisition card in the industrial control computer via a gigabit Ethernet cable. The industrial control computer is equipped with dedicated image processing software for defect detection and analysis. The detection results are transmitted to the main controller via a fieldbus. The entire mechanical structure of the re-inspection unit 800 is connected to the main equipment frame via vibration isolation pads to reduce vibration interference. The vacuum system pipeline is connected to the equipment's vacuum pump.

[0043] The output unit is structurally similar to the input unit 200, using a non-sticky conveyor belt made of polytetrafluoroethylene (PTFE). The conveyor belt is mounted on the frame of the equipment platform 100 via a drive roller and a driven roller. A servo motor drives the drive roller via a reducer. A pneumatic push rod sorting system is installed above the conveyor belt. The push rod is driven by a cylinder and mounted on a bracket on the side of the conveyor belt. The air supply pipeline of the cylinder is connected to a compressed air system. The movement of the push rod is controlled by a solenoid valve, which receives sorting signals from the main controller. Two collection boxes are installed at the end of the conveyor belt to collect qualified and unqualified products, respectively. The collection boxes are mounted on the frame of the equipment platform 100 via slide rails for easy removal. The drive motor of the conveyor belt feeds back position signals to the controller via an encoder to ensure the precise timing of the sorting action. The electrical connections of the entire output unit are connected to the main control cabinet through a junction box. The mechanical structure is fixed to the discharge end of the re-inspection unit 800 with bolts.

[0044] It should also be noted that the entire equipment's control system adopts a hierarchical control architecture of PLC, touch screen, and industrial computer. The PLC is connected to various servo drives, temperature controllers, sensors, and actuators via a bus. The touch screen is connected to the PLC via Ethernet cable, providing a human-machine interface for operators. The industrial computer communicates with the PLC via Ethernet and is responsible for image processing, data management, and upper-level monitoring functions. The power supply for all electrical equipment is ensured by a UPS uninterruptible power supply to ensure stability. Air conditioning and dehumidification devices are installed in the control cabinet to maintain a suitable working environment. Emergency stop buttons are distributed in key locations on the equipment and are connected to safety relays via hard wiring. Safety light curtains are installed at the entrance of hazardous areas, and the light curtain signals are also connected to safety relays. When personnel are detected entering, the equipment power is immediately cut off. The audible and visual alarm is installed on the top of the control cabinet and controlled by the PLC output. All signal cables are shielded cables and laid through metal cable trays. Strong and weak current cables are separated to avoid electromagnetic interference.

[0045] Based on the aforementioned polarizer layer peeling detection equipment, a polarizer layer peeling detection method is also proposed, which includes the following detection process:

[0046] 1. Feeding: The polarizing film 700 to be tested enters the equipment through the non-stick conveyor belt of the input unit 200;

[0047] 2. Preheating: Uniform heating is performed in the preheating unit 300 to reach the set temperature;

[0048] 3. Transfer: The vacuum chuck 620 of the transfer unit 600 transfers the heated polarizer to the arch forming unit 500;

[0049] 4. Forming: The arch forming unit 500 extrudes the polarizer into an arch shape, separating the layers;

[0050] 5. Peel test: The peel test unit 400 clamps the membrane for peel strength testing;

[0051] 6. Re-inspection: The re-inspection unit 800 checks the surface quality of the polarizer after stripping;

[0052] 7. Output: Qualified products and unqualified products are output to different collection boxes respectively.

[0053] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. A device for detecting the peeling of different layers of a polarizer, characterized in that, It includes an equipment platform, an input unit, a preheating unit, a transfer unit, an arch forming unit, a peel testing unit, a re-inspection unit, and an output unit. All of the above units are set on the equipment platform and arranged in sequence according to the polarizer testing process. The polarizer to be tested is input from one side and the tested polarizer is output from the other side. The input unit inputs the polarizer to be tested, and the preheating unit heats its upper and lower layers evenly. The transfer unit transfers it to the arch forming unit to be extruded into an arch shape for layering and testing. The arch forming unit includes a support platform, which is fixed on the equipment platform. An electric heating tube is embedded in the support platform. Roller moving parts are installed on both sides of the support platform. Two sets of extrusion rollers are installed on the roller moving parts. A pressure sensor is embedded in the bearing seat of each extrusion roller. The peeling test unit includes a three-axis displacement platform. The peeling fixture is installed on the moving end of the transverse slide rail of the three-axis displacement platform. A tension sensor is installed at the clamping end of the peeling fixture. The three-axis displacement platform maintains a relative positional relationship with the arch forming unit by adjustment. After the polarizer is stripped and tested, it is re-inspected by the re-inspection unit and then output through the transfer unit. The upper part of the preheating unit uses an aluminum alloy heating plate, which is installed on a support frame above the input unit. The lower part of the preheating unit uses a flexible heating film, which is attached to the outer surface of the non-stick conveyor belt. The transfer unit adopts a three-position vacuum suction cup system, which includes a three-position suction cup frame, a three-position moving slide rail, and vacuum suction cups. The three-position suction cup frame is installed on the moving end of the three-position moving slide rail, and the vacuum suction cups are located at the three positions of the three-position suction cup frame. A displacement sensor is installed on one side of the peeling fixture. The displacement sensor is used to locate the central axis of the film in the polarizer.

2. The polarizer layer peeling detection device according to claim 1, characterized in that, The input unit adopts a non-adhesive conveyor belt structure, and photoelectric sensors are installed on the frame on both sides of the non-adhesive conveyor belt.

3. The polarizer layer peeling detection device according to claim 2, characterized in that, The roller moving parts are driven by a servo motor through a reducer and a ball screw to drive the extrusion roller, and the surface of the extrusion roller is hard chrome plated.

4. The polarizer layer peeling detection device according to claim 3, characterized in that, The re-inspection unit is used to inspect the surface quality of the polarizer after stripping. It includes a re-inspection table made of black anodized aluminum alloy. The re-inspection table is mounted on the equipment platform by adjusting the support legs. A vacuum adsorption system is set below the re-inspection table for positioning the polarizer. The re-inspection probe is installed above the re-inspection table.

5. The polarizer layer peeling detection device according to claim 4, characterized in that, Ring light sources are installed on both sides of the re-inspection table, and the ring light sources are at a 45° angle to the table surface.

6. The polarizer layer peeling detection device according to claim 5, characterized in that, The output unit also uses a non-stick conveyor belt, which is installed on the frame of the equipment platform. Two collection boxes are set at the end of the conveyor belt, which are used to collect qualified products and unqualified products respectively.

7. A method for detecting the peeling of layers of a polarizer, used to perform the detection of a polarizer peeling detection device as described in any one of claims 1-6, characterized in that, Includes the following steps: The polarizer to be tested enters the equipment via a non-stick conveyor belt from the input unit; The preheating unit heats the material evenly until the set temperature is reached. The vacuum chuck of the transfer unit transfers the heated polarizer to the arch forming unit; The arch-forming unit compresses the polarizer into an arch shape, separating the layers; The peel test unit clamps the membrane for peel strength testing; The re-inspection unit checks the surface quality of the polarizer after stripping. Qualified and unqualified products are sent to different collection boxes.

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