A folding screen automatic processing OCA film laminating device

Abstract

The application discloses a kind of folding screen automation processing OCA membrane laminating device, it is related to flexible screen processing field, including equipment rack, equipment rack is respectively equipped with material box feeding device, laminating device, visual alignment mechanism, film tearing mechanism, Plasma cleaning mechanism, material box feeding device is separately arranged in equipment rack front and back two sides, six-axis manipulator is equipped below laminating device, laminating device is driven transversely by X direction linear motor, visual alignment mechanism is respectively arranged below laminating device and above PET film attachment platform, visual alignment mechanism is divided into OCA visual alignment component and PET visual alignment component, film tearing mechanism includes OCA film tearing component and PET film tearing component, OCA film tearing component is installed on six-axis manipulator, PET film tearing component is installed on equipment rack and located above PET film attachment platform, the present application can overcome the industry pain points such as ultra-thin OCA film production, bubble, indentation, improve folding screen OCA membrane laminating production yield and product consistency.

Description

Technical Field

[0001] This invention mainly relates to the field of flexible screen processing technology, specifically an automated OCA film lamination device for foldable screen processing. Background Technology

[0002] With the rapid development of technology, foldable screens (flexible OLEDs) have evolved from a "delicate prototype" to a mainstream high-end form that combines durability, thinness, and practicality since their commercialization in 2018. The core breakthroughs are concentrated in hinge technology, UTG flexible glass, crease control, and diversified forms. In the manufacturing process of flexible foldable screens, OCA film is bonded to UTG flexible glass. The quality of OCA and PET film manufacturing directly affects the performance of foldable screens. OCA optical double-sided adhesive relies on its high light transmittance, low haze, temperature resistance, and corrosion resistance to achieve bubble-free bonding of optical components, ensuring long-term screen stability. The product requirements of ultra-thin and multi-fold forms of foldable screens have placed much stricter standards on the OCA film bonding process than on traditional LCD screens.

[0003] In the LCD panel industry, LCD screens do not require folding, so the requirements for OCA manufacturing processes are relatively low. The precision control of the bonding position, the absence of bubbles, and the absence of indentations are not as strict as the requirements for the screen's performance. However, in the use of UTG foldable screens, products need to achieve narrow bezels, folded screens, and triple-folded screens. Low OCA bonding precision, the presence of bubbles, and slight indentations will directly affect the screen's visual effect and lifespan during the use of foldable screens.

[0004] Foldable screens are required to be very thin, and the adhesive layer of OCA is also very thin, about 20-30um. During the peeling process, it is very easy to cause problems such as peeling and pulling of the adhesive. In addition, during the application process, due to the thin adhesive layer, it is easy to cause problems such as indentation and air bubbles. If these manufacturing problems are not handled properly, they will directly affect the production yield of the product. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide an automated OCA film lamination device for foldable screens, so as to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An automated OCA film lamination device for foldable screens includes a machine frame, on which a material box feeding device, a lamination device, a vision alignment mechanism, a film tearing mechanism, and a Plasma cleaning mechanism are respectively mounted. The material box feeding device is located on the front and rear sides of the machine frame and is used for automatic single-piece feeding of a first OCA product, a second OCA product, a first PET product, and a second PET product. A six-axis robotic arm is provided below the bonding device. The bonding device is driven laterally by an X-axis linear motor. The Z-axis height adjustment of the bonding device adopts a Z-axis servo module composed of a servo motor and a lead screw. Two sets of PET film bonding platforms are arranged below the bonding device. A Y-axis linear motor is provided at the bottom of the PET film bonding platform to realize Y-axis displacement. The visual alignment mechanism is respectively set below the bonding device and above the PET film bonding platform. The visual alignment mechanism is divided into an OCA visual alignment component and a PET visual alignment component, each of which uses a CCD camera as a group. The film-tearing mechanism includes an OCA film-tearing assembly and a PET film-tearing assembly. The OCA film-tearing assembly is mounted on a six-axis robotic arm, and the PET film-tearing assembly is mounted on the equipment frame and located above the PET film application platform. The Plasma cleaning mechanism is located above the PET film attachment platform and is used to perform plasma cleaning treatment on the first PET product and the second PET product after the film has been peeled off.

[0007] Specifically, the material box feeding device includes an independent OCA material box and a PET material box. Each OCA material box and PET material box is composed of an independent material box. The OCA material box contains a first OCA product and a second OCA product, and the PET material box contains a first PET product and a second PET product.

[0008] Specifically, the material box feeding device is further provided with a first material picking and conveying arm and a second material picking and conveying arm. The first material picking and conveying arm is set in relation to the OCA material box. The first material picking and conveying arm is used to take out the first OCA product and the second OCA product and transfer them to the OCA pre-alignment platform. The second picking and conveying arm is set to correspond to the PET material box. The second picking and conveying arm is used to take out the first PET product and the second PET product and transfer them to the PET pre-alignment platform.

[0009] Specifically, in this technical solution, a first DD motor is connected below the OCA pre-alignment platform, and a first CCD camera is set above the OCA pre-alignment platform to take visual pre-alignment pictures of the first OCA product and the second OCA product. A second DD motor is connected below the PET pre-alignment platform, and a second CCD camera is set above the PET pre-alignment platform to take visual pre-alignment pictures of the first PET product and the second PET product.

[0010] Specifically, the equipment frame is further provided with a second transfer and conveying arm, which is located between the PET pre-alignment platform and the PET film attaching platform.

[0011] Specifically, in this technical solution, a waste film collection frame is provided below the six-axis robot, and an easy-tear adhesive mechanism is provided on one side of the six-axis robot.

[0012] Specifically, the visual alignment mechanism further includes a third CCD camera and a fourth CCD camera. The third CCD camera is located below the bonding device, and a first dual-moving linear motor is installed at the bottom of the third CCD camera. The third CCD camera is composed of two CCD cameras. The fourth CCD camera is composed of two CCD cameras, and a second dual-moving linear motor is installed at the bottom of the fourth CCD camera.

[0013] Specifically, in this technical solution, a third DD motor is installed at the bottom of the PET film bonding platform, and the third DD motor is mounted on a Y-axis linear motor.

[0014] Specifically, in this technical solution, the lower end of the Plasma cleaning mechanism is provided with a Plasma cleaning head, which is vertically downward and corresponds to the PET film attachment platform. A cleaning roller is provided parallel to one side of the Plasma cleaning head, and the cleaning roller is rotatably mounted on the side of the Plasma cleaning mechanism frame.

[0015] Specifically, in this technical solution, the bonding device is internally equipped with an adhesive roller and a steel strip, and the adhesive roller and the steel strip cooperate with each other.

[0016] In summary, the present invention has the following main beneficial effects: Employing a graded dual-vision alignment system, both OCA and PET films undergo initial position correction via a pre-alignment platform, followed by secondary precision photography of all four sides via a third and fourth CCD camera. Combined with X-axis linear motors, Y-axis linear motors, and a third DD motor, multi-dimensional position and angle compensation is achieved, significantly improving bonding accuracy. This meets the high-precision assembly requirements of foldable screens with narrow bezels and multi-fold designs, avoiding screen display defects caused by alignment deviations and ensuring the long-term visual effect and lifespan of the foldable screen. A six-axis robotic arm equipped with an OCA film-peeling component works in conjunction with an easy-tear adhesive mechanism to peel off the OCA protective film. Relying on the stable product posture after pre-alignment, the film-peeling trajectory can be flexibly planned. It is adapted to the characteristics of 20-30μm ultra-thin OCA adhesive layers, effectively avoiding poor film peeling and adhesive failure. At the same time, after the PET film is peeled off, it undergoes plasma surface purification through a Plasma cleaning head to remove micro-dust, static electricity, and oil stains from the film surface, reducing bonding defects and significantly improving the production yield of the OCA bonding process for foldable screens. Furthermore, the bonding device employs a bonding structure that combines a bonding roller with a steel belt for coordinated rolling. The steel belt can evenly distribute the downward pressure, preventing localized indentations from forming on the ultra-thin OCA adhesive layer. As the roller moves at a constant speed, it can gradually expel air between the films, solving the industry problem of air bubbles easily generated during thin adhesive bonding. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the OCA material handling mechanism of the present invention; Figure 3 This is a schematic diagram of the OCA film-tearing mechanism of the present invention; Figure 4 This is a schematic diagram of the bonding action structure of the OCA bonding device of the present invention; Figure 5 This is a schematic diagram of the OCA visual imaging structure of the present invention; Figure 6 This is a schematic diagram of the Plasma cleaning structure of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 1. Equipment frame; 2. Material box loading device; 3. Laminating device; 4. Vision alignment mechanism; 5. Film tearing mechanism; 6. Plasma cleaning mechanism; 10. PET material box; 11. Second material handling and conveying arm; 12. PET pre-alignment platform; 13. Second CCD camera; 14. Second transfer and conveying arm; 15. Cleaning roller; 16. OCA material box; 17. Second DD motor; 18. First PET product; 20. First OCA product; 21. OCA pre-alignment platform; 22. First material handling and conveying arm; 23. First CCD camera; 24. First DD motor; 30. Six-axis robot; 31. Waste film collection box; 32. Easy-tear adhesive mechanism; 33. OCA film tearing assembly; 35. PET film application platform; 36. Steel belt; 37. Application roller; 38. X-axis linear motor; 39. Z-axis servo module; 40. Second OCA product; 41. Third CCD camera; 42. First double-actuator linear motor; 46. Third DD motor; 47. Y-axis linear motor; 48. Fourth CCD camera; 49. Plasma cleaning head; 50. Second double-actuator linear motor; 51. Second PET product. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] The embodiments of the present invention will now be described.

[0021] It should be noted that the entire machine operates in a fully automatic cycle following the sequence of OCA feeding pre-alignment, PET feeding pre-alignment, OCA film peeling precision positioning, PET film peeling plasma cleaning precision positioning, and double film high-precision alignment roller pressing and bonding. All visual image data is uniformly transmitted to the equipment PLC control system to complete coordinate calculation and deviation compensation. Each servo, linear motor, and DD motor performs position correction based on the calculation results. The entire process is seamless and requires no manual intervention.

[0022] In this embodiment, please refer to Figure 1 - Figure 6 As shown, an automated OCA film lamination device for foldable screens includes a frame 1, which serves as the mounting reference for all functional mechanisms. The frame 1 is equipped with a material box feeding device 2, a lamination device 3, a vision alignment mechanism 4, a film tearing mechanism 5, and a plasma cleaning mechanism 6. These mechanisms work together to complete the fully automated feeding, pre-positioning, film tearing, plasma cleaning, secondary precision vision alignment, and bubble-free roller lamination of the ultra-thin OCA film and PET film for foldable screens. This device specifically addresses production defects such as film tearing and adhesive pulling of 20-30μm ultra-thin OCA adhesive layers, lamination bubbles, surface foreign matter, alignment misalignment, and film surface indentations. The feeding device 2 is located on both the front and rear sides of the equipment frame 1, and is used for automatic single-piece feeding of the first OCA product 20, the second OCA product 40, the first PET product 18, and the second PET product 51. The feeding device 2 includes independent OCA feeding boxes 16 and PET feeding boxes 10. Both OCA feeding boxes 16 and PET feeding boxes 10 consist of two independent boxes, which can realize material change and replenishment without stopping the machine. The OCA feeding box 16 contains the first OCA product 20 and the second OCA product 40, and the PET feeding box 10 contains the first PET product 18 and the second PET product 51. The material box feeding device 2 is also equipped with a first picking and conveying arm 22 and a second picking and conveying arm 11. The first picking and conveying arm 22 is set to correspond to the OCA material box 16. The first picking and conveying arm 22 uses vacuum adsorption to grab the first OCA product 20 or the second OCA product 40 in the OCA material box 16 one piece and transfer it to the OCA pre-alignment platform 21. The second picking and conveying arm 11 is set to correspond to the PET material box 10. The second picking and conveying arm 11 uses a vacuum suction cup to pick up the first PET product 18 and the second PET product 51 in the PET material box 10 one piece and transfer it to the PET pre-alignment platform 12. A first DD motor 24 is connected below the OCA pre-alignment platform 21. A first CCD camera 23 is installed above the OCA pre-alignment platform 21 to perform visual pre-alignment photography of the first OCA product 20 and the second OCA product 40. The first CCD camera 23 is part of the OCA pre-alignment component of the visual alignment mechanism 4 and consists of two cameras. It is used to perform four-corner reference visual pre-photography of the first OCA product 20 and the second OCA product 40 placed on the OCA pre-alignment platform 21. A second DD motor 17 is connected below the PET pre-alignment platform 12. Above the platform 12 is a second CCD camera 13 for visual pre-alignment photography of the first PET product 18 and the second PET product 51. The second CCD camera 13 is a PET pre-alignment component, which is also composed of dual CCD cameras to complete the initial visual positioning acquisition of the first PET product 18 and the second PET product 51. The equipment frame 1 is also equipped with a second transfer and conveying arm 14, which is located between the PET pre-alignment platform 12 and the PET film attaching platform 35. It undertakes the PET film transfer process after the pre-alignment is completed, realizing the cross-station transport of PET products. The visual alignment mechanism 4 is respectively set below the bonding device 3 and above the PET film bonding platform 35. The visual alignment mechanism 4 is divided into an OCA visual alignment component and a PET visual alignment component, both of which use two CCD cameras as a group. In addition to the first CCD camera 23 and the second CCD camera 13 in the pre-alignment stage, the visual alignment mechanism 4 also includes two sets of secondary fine alignment components: a third CCD camera 41 and a fourth CCD camera 48. The third CCD camera 41 is set below the bonding device 3, and a first dual-moving linear motor 42 is installed at the bottom of the third CCD camera 41. The dual-moving structure can widen the camera's shooting stroke and adapt to four-corner shooting of OCA products of different sizes. The fourth CCD camera 48 is mounted above the PET film bonding platform 35, and a second dual-moving linear motor 50 is installed at the bottom of the fourth CCD camera 48 for high-precision benchmark acquisition after the PET film is cleaned. Both the third CCD camera 41 and the fourth CCD camera 48 are composed of dual CCD cameras to ensure the image acquisition field of view and positioning accuracy.

[0023] Please see Figure 3 - Figure 4As shown, the bonding device 3 is located in the middle of the equipment frame 1. The bonding device 3 is driven laterally by an X-axis linear motor 38. The Z-axis height adjustment of the bonding device 3 adopts a Z-axis servo module 39 composed of a servo motor and a lead screw. The pressing height and pressing pressure can be precisely programmed and controlled. The bonding device 3 is equipped with an adhesive roller 37 and a steel belt 36. The adhesive roller 37 and the steel belt 36 roll together to form a uniform and flexible pressing structure, avoiding local pressure on the ultra-thin OCA adhesive layer and causing indentations. A six-axis robot 30 is provided below the bonding device 3. The six-axis robot 30 performs OCA film peeling assistance. An easy-tear bonding mechanism 32 is provided on one side of the six-axis robot 30. The internal structure can be loaded with a roll of standardized easy-tear film. A waste film collection frame 31 is set below the six-axis robot arm 30 to collect the protective film waste after it is removed. Two sets of PET film attaching platforms 35 are arranged below the bonding device 3. A Y-axis linear motor 47 is provided at the bottom of the PET film attaching platform 35 to realize Y-axis displacement. A third DD motor 46 is installed at the bottom of the PET film attaching platform 35. The third DD motor 46 is mounted on the Y-axis linear motor 47. The Y-axis linear motor 47 drives the PET film attaching platform 35 to complete the forward and backward Y-axis displacement. The third DD motor 46 can independently drive the platform to rotate to realize the angular deviation compensation of PET products.

[0024] The film-tearing mechanism 5 includes two main modules: the OCA film-tearing component 33 and the PET film-tearing component. The OCA film-tearing component 33 is mounted on the six-axis robot 30 and follows the six-axis robot 30 to achieve multi-degree-of-freedom precise film-tearing action. The PET film-tearing component is mounted on the equipment frame 1 and located above the PET film attaching platform 35, and completes the peeling of the surface protective film for PET products transferred to the platform. Please see Figure 1 and Figure 6 As shown, the Plasma cleaning mechanism 6 is positioned above the PET film bonding platform 35 and is used to perform plasma cleaning on the first PET product 18 and the second PET product 51 after the film is peeled off. The lower end of the Plasma cleaning mechanism 6 is equipped with a Plasma cleaning head 49, which is vertically downward and corresponds to the PET film bonding platform 35 to remove static electricity, microparticles, and oil impurities from the film surface after peeling. A cleaning roller 15 is parallel to one side of the Plasma cleaning head 49. The cleaning roller 15 is rotatably mounted on the side of the frame of the Plasma cleaning mechanism 6 and can assist in rolling away large particles of foreign matter remaining on the film surface. The dual cleaning reduces the defect rate of foreign matter in the bonding process.

[0025] The first step is to perform automatic membrane material feeding and initial visual pre-alignment: The material box feeding device 2 simultaneously starts the OCA and PET two-way feeding process. The first material picking and conveying arm 22 of the OCA material box 16 vacuum picks up the first OCA product 20 or the second OCA product 40 and moves it horizontally to the OCA pre-alignment platform 21. The OCA pre-alignment platform 21 moves to be directly below the first CCD camera 23. The first CCD camera 23 completes visual photography of the four corners of the OCA product. After the PLC collects the image reference coordinates, it calculates the plane and angle deviations and outputs control signals to drive the first DD motor 24 to drive the OCA pre-alignment platform 21 to complete the initial position and angle correction and complete the OCA pre-alignment. Meanwhile, the PET material box 10, equipped with the second picking and conveying arm 11, picks up the first PET product 18 or the second PET product 51 and transfers it to the PET pre-alignment platform 12. The PET pre-alignment platform 12 moves to the shooting area of ​​the second CCD camera 13. The second CCD camera 13 acquires the reference image of the PET film and drives the PET pre-alignment platform 12 to complete the pre-alignment compensation of the PET product through the second DD motor 17. The PET product that has completed the pre-alignment is picked up from the PET pre-alignment platform 12 by the second transfer conveying arm 14 and transferred to the PET film attaching platform 35 to wait for the film peeling and cleaning process.

[0026] Perform the OCA film removal and secondary precision vision positioning process: Driven by the X-axis linear motor 38, the bonding device 3 moves horizontally to above the OCA pre-alignment platform 21. It picks up the first OCA product 20 or the second OCA product 40 that has been pre-aligned by vacuum adsorption, and then moves to the working area of ​​the six-axis robot 30. The six-axis robot 30 first picks up a single easy-tear patch from the side easy-tear mechanism 32, and then, with the OCA film peeling component 33 integrated at the end, attaches the easy-tear patch to the edge of the OCA protective film. The protective film is peeled off according to the preset flexible trajectory. The waste film after peeling falls directly to the waste film collection box 31 below for centralized collection. Because the OCA product has undergone pre-alignment in the early stage, the position is stable after the bonding device 3 adsorbs it. The six-axis robot 30 can optimize the tearing path for the 20-30μm ultra-thin OCA adhesive layer, effectively avoiding adhesive layer pulling and missing adhesive caused by excessive tearing force. After the film peeling process is completed, the bonding device 3 moves to the bottom of the third CCD camera 41. The first double-acting linear motor 42 drives the third CCD camera 41 to complete high-definition imaging of the four corners of the OCA product. The PLC system records the precise reference coordinates of the OCA product and completes the secondary fine alignment of the OCA, providing a data reference for subsequent bonding compensation.

[0027] Simultaneously carry out PET film removal, plasma cleaning, and secondary precision alignment processes for PET: The first PET product 18 and the second PET product 51, placed on the PET film bonding platform 35, have their surface protective film automatically peeled off by the PET film peeling assembly above the frame. After the film is peeled off, the Y-axis linear motor 47 drives the PET film bonding platform 35 to move at a constant speed to below the Plasma cleaning mechanism 6. The Plasma cleaning head 49 outputs plasma airflow downwards to bombard the PET film surface, eliminating static electricity, fine dust and oil stains on the film surface. The side-rotatable cleaning roller 15 rolls synchronously to help remove attached large particle impurities. The dual cleaning structure greatly reduces the defect of bonding foreign objects. After the cleaning process is completed, the Y-axis linear motor 47 moves the PET film attaching platform 35 to the shooting area of ​​the fourth CCD camera 48. The second double-acting linear motor 50 adjusts the shooting position of the fourth CCD camera 48 to capture images of the four corner references of the PET product. The PLC calculates the compensation amount based on the imaging deviation and drives the third DD motor 46 to rotate the PET film attaching platform 35 to complete the secondary precision correction of the angle and planar position of the PET product and simultaneously store the PET reference coordinates.

[0028] Finally, a double-film high-precision alignment and bubble-free roller bonding process is performed: The PLC system synchronously retrieves the OCA coordinates acquired by the third CCD camera 41 and the PET coordinates acquired by the fourth CCD camera 48, automatically calculates the three-dimensional deviations of the two in X, Y, and angle, and outputs compensation commands: the X-axis linear motor 38 drives the bonding device 3 to complete the X-axis displacement compensation of the OCA product, the Y-axis linear motor 47 drives the PET film bonding platform 35 to complete the Y-axis displacement compensation of the PET product, and the third DD motor 46 finely adjusts the rotation angle of the PET film bonding platform 35 to eliminate the angle deviation. After bidirectional linkage compensation, the alignment accuracy of OCA and PET can reach ±0.05mm. After the position compensation is in place, the Z-axis servo module 39 drives the bonding device 3 downwards as a whole. Inside the bonding device 3, the adhesive roller 37 presses the steel strip 36 synchronously downwards, and the steel strip 36 evenly distributes the pressing force to avoid local pressure on the ultra-thin OCA adhesive layer, which can cause indentations. During the uniform rolling process, the adhesive roller 37 gradually discharges air between the film layers from the center to both sides, eliminating bonding bubble defects. After the entire set of roller pressing and bonding actions is completed, a bubble-free, indentation-free, foreign object-free, and precisely aligned OCA and PET composite film can be output, which is suitable for the subsequent assembly requirements of foldable screen UTG flexible glass.

[0029] Thus, relying on the dual visual pre-alignment and secondary precision alignment structure, ultra-high bonding accuracy is achieved. Plasma cleaning, combined with auxiliary cleaning roller 15, solves the problem of foreign objects on the film surface. Steel strip 36, together with roller for flexible pressing, and six-axis robot 30 for controllable trajectory film tearing, specifically overcome industry pain points such as glue pulling, bubbles, and indentations in the production of ultra-thin OCA film, greatly improving the yield and product consistency of OCA film bonding production for foldable screens.

[0030] The working principle of this invention is as follows: The material box feeding device 2 simultaneously starts the OCA and PET dual-feed process. The first picking and conveying arm 22, which is equipped with the OCA material box 16, vacuum picks up the first OCA product 20 or the second OCA product 40 and moves it horizontally to the OCA pre-alignment platform 21. The OCA pre-alignment platform 21 moves to be directly below the first CCD camera 23. The first CCD camera 23 completes visual imaging of the four corners of the OCA product. After the PLC collects the image reference coordinates, it calculates the plane and angle deviations and outputs control signals to drive the first DD motor 24 to drive the OCA pre-alignment platform 21 to complete the initial position and angle correction. OCA pre-positioning, at the same time, the PET material box 10 is equipped with the second material picking and conveying arm 11 to pick up the first PET product 18 or the second PET product 51 in one piece and transfer it to the PET pre-alignment platform 12. The PET pre-alignment platform 12 moves to the shooting area of ​​the second CCD camera 13. The second CCD camera 13 acquires the reference image of the PET film and drives the PET pre-alignment platform 12 to complete the pre-alignment compensation of the PET product through the second DD motor 17. The PET product with pre-alignment completed is picked up from the PET pre-alignment platform 12 by the second transfer conveying arm 14 and transferred to the PET film attaching platform 35. Furthermore, the bonding device 3, driven by the X-axis linear motor 38, moves horizontally to above the OCA pre-alignment platform 21. It uses vacuum adsorption to pick up the first OCA product 20 or the second OCA product 40 that has completed pre-alignment, and then moves to the working area of ​​the six-axis robot 30. The six-axis robot 30 first picks up a single easy-tear patch from the side easy-tear mechanism 32, and then, with the OCA film-tearing component 33 integrated at the end, attaches the easy-tear patch to the edge of the OCA protective film. The protective film is peeled off according to the preset flexible trajectory. The peeled waste film falls directly to the waste film collection box 31 below for collection. After the film-tearing process is completed, the bonding device 3 moves to below the third CCD camera 41. The first dual-actuator linear motor 42 drives the third CCD camera 41 to complete high-definition imaging of the four corners of the OCA product. The PLC system records the precise reference coordinates of the OCA product and completes the secondary fine alignment of the OCA. The first PET product 18 and the second PET product 51, placed on the PET film attaching platform 35, have their surface protective films automatically peeled off by the PET film peeling assembly above the frame. After the film peeling is completed, the Y-axis linear motor 47 drives the PET film attaching platform 35 to move at a constant speed to below the Plasma cleaning mechanism 6. The Plasma cleaning head 49 outputs plasma airflow downwards to bombard the PET film surface, eliminating static electricity, fine dust and oil stains on the film surface. The side-rotatable cleaning roller 15 rolls synchronously to help remove attached large particle impurities. After completion, the Y-axis linear motor 47 moves the PET film attaching platform 35 to the shooting area of ​​the fourth CCD camera 48. The second double-acting linear motor 50 adjusts the shooting position of the fourth CCD camera 48 to image and acquire the four corner references of the PET product. The PLC calculates the compensation amount according to the imaging deviation and drives the third DD motor 46 to rotate the PET film attaching platform 35 to complete the secondary precision correction of the angle and planar position of the PET product and simultaneously store the PET reference coordinates. Finally, the PLC system synchronously retrieves the OCA coordinates acquired by the third CCD camera 41 and the PET coordinates acquired by the fourth CCD camera 48, automatically calculates the three-dimensional deviations of the two in X, Y, and angle, and outputs compensation commands: the X-axis linear motor 38 drives the bonding device 3 to complete the X-axis displacement compensation of the OCA product, the Y-axis linear motor 47 drives the PET film bonding platform 35 to complete the Y-axis displacement compensation of the PET product, the third DD motor 46 finely adjusts the rotation angle of the PET film bonding platform 35 to eliminate the angle deviation, and after the position compensation is in place, the Z-axis servo module 39 drives the bonding device 3 downward to press down as a whole. The bonding roller 37 inside the bonding device 3 presses the steel strip 36 synchronously and rolls down, and the steel strip 36 evenly distributes the pressing force to avoid local pressure on the ultra-thin OCA adhesive layer and the formation of indentations. During the uniform rolling process of the bonding roller 37, the air between the film layers is gradually discharged from the middle to both sides. After the entire set of roller pressing and bonding actions is completed, an OCA and PET composite film material with no bubbles, no indentations, no foreign matter, and accurate alignment can be output.

[0031] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An automated OCA film lamination device for foldable screens, comprising a machine frame (1), wherein a material box feeding device (2), a lamination device (3), a vision alignment mechanism (4), a film tearing mechanism (5), and a Plasma cleaning mechanism (6) are respectively mounted on the machine frame (1), characterized in that, The feeding device (2) is located on the front and rear sides of the equipment frame (1) and is used for automatic single-piece feeding of the first OCA product (20), the second OCA product (40), the first PET product (18) and the second PET product (51); The bonding device (3) is equipped with a six-axis robot (30) below it. The bonding device (3) is driven laterally by an X-axis linear motor (38). The Z-axis height adjustment of the bonding device (3) is achieved by a Z-axis servo module (39) consisting of a servo motor and a lead screw. Two sets of PET film bonding platforms (35) are arranged below the bonding device (3). The bottom of the PET film bonding platform (35) is equipped with a Y-axis linear motor (47) to achieve Y-axis displacement. The visual alignment mechanism (4) is respectively set below the bonding device (3) and above the PET film bonding platform (35). The visual alignment mechanism (4) is divided into an OCA visual alignment component and a PET visual alignment component, both of which use two CCD cameras as a group. The film-tearing mechanism (5) includes an OCA film-tearing assembly (33) and a PET film-tearing assembly. The OCA film-tearing assembly (33) is mounted on a six-axis robot (30), and the PET film-tearing assembly is mounted on the equipment frame (1) and located above the PET film attaching platform (35). The Plasma cleaning mechanism (6) is located above the PET film attaching platform (35) and is used to perform plasma cleaning on the first PET product (18) and the second PET (51) after the film is removed.

2. The automated OCA film lamination device for foldable screen processing according to claim 1, characterized in that, The feeding device (2) includes an independent OCA box (16) and a PET box (10). The OCA box (16) and the PET box (10) are each composed of two independent boxes. The OCA box (16) contains a first OCA product (20) and a second OCA product (40). The PET box (10) contains a first PET product (18) and a second PET product (51).

3. The automated OCA film lamination device for foldable screen processing according to claim 2, characterized in that, The material box feeding device (2) is also provided with a first material picking and conveying arm (22) and a second material picking and conveying arm (11). The first material picking and conveying arm (22) is provided in relation to the OCA material box (16). The first material picking and conveying arm (22) is used to take out the first OCA product (20) and the second OCA product (40) and transfer them to the OCA pre-alignment platform (21). The second picking and conveying arm (11) is set to correspond to the PET box (10). The second picking and conveying arm (11) is used to take out the first PET product (18) and the second PET product (51) and transfer them to the PET pre-alignment platform (12).

4. The automated OCA film lamination device for foldable screen processing according to claim 3, characterized in that, The OCA pre-alignment platform (21) is connected to a first DD motor (24) below it. The OCA pre-alignment platform (21) is equipped with a first CCD camera (23) for visual pre-alignment photography of the first OCA product (20) and the second OCA product (40). The PET pre-alignment platform (12) is connected to a second DD motor (17) below it. The PET pre-alignment platform (12) is equipped with a second CCD camera (13) for visual pre-alignment photography of the first PET product (18) and the second PET product (51).

5. The automated OCA film lamination device for foldable screen processing according to claim 3, characterized in that, The equipment frame (1) is also provided with a second transfer and conveying arm (14), which is located between the PET pre-alignment platform (12) and the PET film attaching platform (35).

6. The automated OCA film lamination device for foldable screen processing according to claim 1, characterized in that, A waste film collection frame (31) is provided below the six-axis robot (30), and an easy-tear adhesive mechanism (32) is provided on one side of the six-axis robot (30).

7. The automated OCA film lamination device for foldable screen processing according to claim 1, characterized in that, The visual alignment mechanism (4) also includes a third CCD camera (41) and a fourth CCD camera (48). The third CCD camera (41) is located below the bonding device (3), and a first dual-moving linear motor (42) is installed at the bottom of the third CCD camera (41). The third CCD camera (41) is composed of two CCD cameras. The fourth CCD camera (48) is composed of two CCD cameras, and a second dual-motor linear motor (50) is installed at the bottom of the fourth CCD camera (48).

8. The automated OCA film lamination device for foldable screen processing according to claim 1, characterized in that, The bottom of the PET film attaching platform (35) is equipped with a third DD motor (46), which is mounted on a Y-axis linear motor (47).

9. The automated OCA film lamination device for foldable screen processing according to claim 1, characterized in that, The lower end of the Plasma cleaning mechanism (6) is provided with a Plasma cleaning head (49), which is vertically downward and corresponds to the PET film attachment platform (35). A cleaning roller (15) is provided parallel to one side of the Plasma cleaning head (49), and the cleaning roller (15) is rotatably installed on the side of the frame of the Plasma cleaning mechanism (6).

10. The automated OCA film lamination device for foldable screen processing according to claim 1, characterized in that, The bonding device (3) is equipped with an adhesive roller (37) and a steel strip (36) inside, and the adhesive roller (37) and the steel strip (36) cooperate with each other.

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