Folding cover plate manufacturing system for display screen

Abstract

The invention discloses a display screen folding cover plate manufacturing system which comprises a printing unit, a die cutting unit, a detection unit, a laser processing unit and an attaching unit, the printing unit is used for printing an ink frame on a base material, the die cutting unit is used for pasting an OCA adhesive layer on the base material in a rolling mode and conducting die cutting to obtain a base plate, the detection unit is used for detecting whether the base plate has defects or not, and the laser processing unit is used for processing the base plate. The laser processing unit is used for carrying out laser processing on a substrate, and the laminating unit is used for laminating a functional layer on the substrate; the detection unit comprises a first box body with two through sides, a detection mechanism is arranged in the first box body, the detection mechanism comprises a movable shaft movably connected between the inner side walls of the first box body, the lower end of the movable shaft is connected with a contact plate, the contact plate is obliquely arranged towards the conveying line, and the contact plate is used for being in contact with the top surface of a substrate on the conveying line; the top of the movable shaft is radially connected with a synchronous rod, the top of the synchronous rod is connected with a pull wire, and the pull wire is connected with a trigger mechanism.

Description

Technical Field

[0001] This application relates to the field of display manufacturing technology, and in particular to a folding cover manufacturing system for display screens. Background Technology

[0002] A cover glass is a transparent lens used to protect the touch module and non-touch screen of a touch display screen, and is attached to the outside of the electronic display. The cover glass substrate is constantly adapting to the development of related displays to achieve better light transmittance, stability, and rigidity, while also ensuring a safer and smoother display experience. Flexible cover glass is a core material for foldable phones. To fully realize flexible displays, the display cover glass should be repeatedly bendable, transparent, ultra-thin, and sufficiently rigid.

[0003] In the manufacturing production line of folding covers, the following processes are required in sequence: printing, drying, product yield inspection, die cutting, product yield inspection, laser processing, and bonding. In the quality inspection stage, machine vision recognition technology (i.e., using a CCD camera) is generally used to detect the processing quality of the products after the corresponding process steps are completed. However, machine vision recognition takes a certain amount of time to process image data. Therefore, when the products pass through the inspection station on the conveyor line, the conveyor speed needs to be reduced or the conveyor needs to be stopped to match the inspection cycle, thereby screening out products that do not meet the yield standards. If the conveyor speed is reduced every time an inspection is performed, it will affect the working efficiency of the entire production line. Summary of the Invention

[0004] The main objective of this application is to provide a folding cover manufacturing system for displays, which aims to solve the technical problem of low working efficiency in existing folding cover manufacturing production lines.

[0005] To achieve the above objectives, this application provides a manufacturing system for a folding cover plate for a display screen, comprising a printing unit, a die-cutting unit, an inspection unit, a laser processing unit, and a bonding unit connected sequentially via a conveyor line. The printing unit is used to print an ink border on a substrate. The die-cutting unit is used to roll an OCA adhesive layer onto the printed substrate and perform overall die-cutting to obtain a substrate. The inspection unit is used to detect whether the substrate has warping and / or bubble defects. The laser processing unit is used to perform laser processing on the substrate. The bonding unit is used to bond a functional layer onto the laser-processed substrate. The inspection unit includes a first housing that extends through both sides. A detection mechanism is disposed inside the first housing. The detection mechanism includes a movable shaft movably connected between the inner side walls of the first housing. A contact plate is connected to the lower end of the movable shaft. The contact plate is inclined towards the conveyor line and is used to contact the top surface of the substrate on the conveyor line. A synchronizing rod is radially connected to the top of the movable shaft. A pull wire is connected to the top of the synchronizing rod and a triggering mechanism is connected to the pull wire.

[0006] Optionally, the triggering mechanism includes a slider connected to a pull wire. The slider is slidably connected to the top of the first housing via a slide rail. The sliding direction of the slider is parallel to the conveying direction of the conveyor line. A first spring is connected to the side of the slider near the synchronizing rod. A pressure sensor located at the top of the first housing is connected to the other end of the first spring.

[0007] Optionally, the contact plate includes a movable plate connected to the lower end of the movable shaft, and a hollow cylinder movably connected to the bottom of the movable plate to contact the top surface of the substrate.

[0008] Optionally, the pressure sensor is electrically connected to a controller, and the controller is electrically connected to a flattening mechanism. The detection mechanism and the flattening mechanism are arranged sequentially along the conveyor line. The flattening mechanism includes a first telescopic cylinder located at the top of the first housing. The bottom of the first telescopic cylinder is connected to a connecting frame located inside the first housing. A rotating rod is movably connected to the bottom of the connecting frame. A first motor for driving the rotating rod is provided on the outer wall of the connecting frame. Both the first motor and the first telescopic cylinder are electrically connected to the controller. Multiple flexible flattening components are arranged in a circular array around the axis of the rotating rod. The flexible flattening components are used to flatten warpage and / or air bubbles on the substrate.

[0009] Optionally, the flexible flattening assembly includes a connecting plate connected to a rotating roller, a guide groove extending through the end of the connecting plate, a second spring connected to the guide groove, a telescopic plate connected to the second spring, and a pressure roller movably connected to one end of the telescopic plate extending out of the guide groove. The pressure roller is used to flatten warpage and / or air bubbles on the substrate.

[0010] Optionally, the controller has a built-in control module, which is used to control the coordinated operation of various components of the printing unit. The control module stores a preset control model, and the expression of the control model is: Q=K1·(F / σ) +K2·tanθ +K3 / V+ K4·logH + K5·ΔT; ΔT < α·δ / ε; In the formula, Q is the target printing precision, K1 is the first empirical coefficient, K2 is the second empirical coefficient, K3 is the third empirical coefficient, K4 is the fourth empirical coefficient, K5 is the fifth empirical coefficient, F is the screen tension, σ is the substrate surface energy, θ is the squeegee angle, V is the printing speed, H is the squeegee hardness, ΔT is the stepped curing temperature, α is the substrate thermal expansion coefficient, δ is the ink border layer thickness, and ε is the thermal strain threshold. Among these, the screen tension F is negatively correlated with the printing speed V, and the squeegee hardness H is negatively correlated with the squeegee angle θ.

[0011] Optionally, the bonding unit includes a second housing, a gripping mechanism at the top of the second housing for gripping the substrate, a bonding mechanism at the bottom of the second housing for bonding a functional layer to the bottom surface of the substrate, a sliding groove at the top of the second housing, the gripping mechanism being slidably connected to the sliding groove via a slide rail, and a second telescopic cylinder connected to the gripping mechanism in the second housing for driving the gripping mechanism to slide directly above the bonding mechanism.

[0012] Optionally, the bonding mechanism includes a third telescopic cylinder disposed at the bottom of the second housing, a frame disposed at the top of the third telescopic cylinder, the top of the frame being used to support the functional layer, the frame being used to press the central area of ​​the functional layer onto the central area of ​​the bottom surface of the substrate, a lifting assembly disposed inside the frame, and brackets being hinged to both sides of the lifting assembly via spring hinges, the two brackets being symmetrically arranged on both sides of the frame, and pressure rollers being movably connected to the top of the brackets, the pressure rollers being used to press the functional layer onto the bottom surface of the substrate.

[0013] Optionally, the lifting assembly includes a second motor located at the top of the frame, the second motor being connected to a lifting screw, the bottom of the lifting screw being movably connected to the bottom of the frame via a bearing, a screw nut being threaded onto the lifting screw, two supports being hinged to both sides of the screw nut via spring hinges, and a guide vertical rod being fixedly installed inside the frame and movably passing through the screw nut.

[0014] Optionally, the gripping mechanism includes a mold base slidably connected to a groove, a forming cavity that mates with a substrate at the bottom of the mold base, a movable cavity that is independent of the forming cavity in the mold base, a lifting plate in the movable cavity, a fourth telescopic cylinder at the top of the lifting plate connected to the top of the lifting plate, a plurality of vacuum tubes passing through the lifting plate, the vacuum tubes moving through the top and bottom of the mold base, a vacuum suction cup for adsorbing the substrate connected to the bottom of the vacuum tubes, and a blind hole for accommodating the vacuum suction cup at the top of the forming cavity.

[0015] The beneficial effects that this application can achieve are as follows: This application involves printing an ink outline on a substrate using a printing unit, and then rolling an OCA adhesive layer onto the printed substrate using a die-cutting unit before die-cutting the entire substrate. When the substrate enters the inspection stage, it moves to the first housing via a conveyor line. If the substrate has obvious air bubbles or warping, a protrusion will form on its top surface as it passes the inspection mechanism. This protrusion, when passing an inclined contact plate, can cause the contact plate to rotate at a certain angle, and the movable shaft will also rotate at a corresponding angle. However, since the protrusion may be relatively low, the rotation angle of the movable shaft may be small, making it difficult to accurately detect the angle change using ordinary sensors. Therefore... Here, the rotation arc of the movable shaft is amplified by a synchronizing rod radially connected to the movable shaft. When the synchronizing rod rotates at a larger arc, it can significantly pull the pull wire, thereby driving the triggering mechanism to operate, that is, detecting protrusion defects such as bubbles or warping on the substrate. Since this application is based on a mechanical triggering detection mechanism, it can quickly and accurately detect protrusion defects on the substrate online, saving the time of waiting for detection results. Therefore, the conveyor line does not need to slow down or stop when carrying the substrate through the detection unit, and can maintain normal speed conveying, thereby improving detection efficiency, that is, improving the working efficiency of the production line, and eliminating the need for expensive machine vision recognition equipment, thus reducing equipment costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the frame of a folding cover manufacturing system for a display screen according to an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the detection unit in an embodiment of this application; Figure 3 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle; Figure 4 This is a schematic diagram of the contact plate structure in an embodiment of this application; Figure 5 This is a schematic diagram of the flexible flattening component in an embodiment of this application; Figure 6 This is a schematic diagram of the internal structure of the bonding unit in an embodiment of this application; Figure 7 This is a schematic diagram of the bonding mechanism in an embodiment of this application; Figure 8 This is a schematic diagram of the structure when the bonding unit bonds the functional layer to the bottom surface of the substrate in an embodiment of this application.

[0018] Figure label: 100 - Printing unit, 200 - Die-cutting unit, 300 - Detection unit, 310 - First housing, 320 - Detection mechanism, 321 - Movable shaft, 322 - Contact plate, 3221 - Movable plate, 3222 - Hollow cylinder, 323 - Synchronizing rod, 324 - Pull wire, 325 - Triggering mechanism, 3251 - Slider, 3252 - First spring, 3253 - Pressure sensor, 330 - Controller, 340 - Flattening mechanism, 341 - First telescopic cylinder, 342 - Connecting frame, 343 - Rotating roller, 344 - First motor, 345 - Flexible flattening assembly, 3451 - Connecting plate, 3452 - Second spring, 3453 - Telescopic plate, 3454 - Pressure roller, 400-laser processing unit, 500-bonding unit, 510-second housing, 511-slide groove, 520-gripping mechanism, 521-mold base, 5211-forming cavity, 5212-moving cavity, 5213-blind hole, 522-lifting plate, 523-fourth telescopic cylinder, 524-vacuum tube, 525-vacuum suction cup, 530-bonding mechanism, 531-third telescopic cylinder, 532-frame, 533-lifting assembly, 5331-second motor, 5332-lifting screw, 5333-screw nut, 5334-guide rod, 534-bracket, 535-pressure roller, 540-second telescopic cylinder, 600-substrate, 700-functional layer.

[0019] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0024] Example Reference Figures 1-8 This embodiment provides a folding cover manufacturing system for a display screen, including a printing unit 100, a die-cutting unit 200, an inspection unit 300, a laser processing unit 400, and a bonding unit 500 connected sequentially via a conveyor line (e.g., a belt conveyor). The printing unit 100 is used to print an ink border on a substrate. The die-cutting unit 200 is used to roll an OCA adhesive layer onto the printed substrate and perform overall die-cutting to obtain a substrate 600. The inspection unit 300 is used to detect whether the substrate 600 has warping and / or bubble defects. The laser processing unit 400 is used to perform laser processing on the substrate 600. The bonding unit 500 is used to perform laser processing on the substrate 600. A functional layer 700 (e.g., a flexible film) is bonded to the substrate 600. The detection unit 300 includes a first housing 310 that extends through both sides. A detection mechanism 320 is provided inside the first housing 310. The detection mechanism 320 includes a movable shaft 321 that is movably connected between the inner sidewalls of the first housing 310. A contact plate 322 is connected to the lower end of the movable shaft 321. The contact plate 322 is arranged inclined toward the conveyor line and is used to contact the top surface of the substrate 600 on the conveyor line. A synchronizing rod 323 is radially connected to the top of the movable shaft 321. A pull wire 324 is connected to the top of the synchronizing rod 323. A triggering mechanism 325 is connected to the pull wire 324.

[0025] In this embodiment, after the printing unit 100 prints an ink outline on the substrate and the die-cutting unit 200 rolls an OCA adhesive layer onto the printed substrate and performs overall die-cutting to obtain the substrate 600, it enters the inspection stage. At this time, the substrate 600 moves into the first housing 310 via a conveyor line. When passing through the inspection mechanism 320, if the substrate 600 has obvious air bubbles or warping, a protrusion will form on its top surface. When the protruding part of the substrate 600 passes the inclined contact plate 322, it can drive the contact plate 322 to rotate a certain angle, and the movable shaft 321 will also rotate a certain angle accordingly. Since the height of the protrusion may be low, the rotation angle of the movable shaft 321 will be relatively small, making it difficult to accurately detect its angle change with ordinary sensors. Therefore, the rotation arc of the movable shaft 321 is amplified by the synchronous rod 323 radially connected to the movable shaft 321. When the synchronous rod 323 rotates at a larger arc, it can significantly pull the pull wire 324, thereby driving the trigger mechanism 325 to run, that is, detecting obvious protrusion defects such as bubbles or warping on the substrate 600. Since the mechanical trigger-type detection mechanism 320 in this embodiment can quickly and accurately detect protrusion defects on the substrate 600 online, the time for waiting for the detection results is saved. Therefore, when the conveyor line carries the substrate 600 through the detection unit 300, there is no need to slow down or stop, and it can maintain normal speed conveying, thereby improving detection efficiency, that is, improving the working efficiency of the production line, and saving the expensive machine vision recognition equipment, and also reducing equipment costs.

[0026] It should be noted that the printing unit 100 can use existing high-precision roll-to-roll screen printing equipment to improve printing quality; the die-cutting unit 200 can use existing asynchronous die-cutting and bonding die-cutting machines; and the laser processing unit 400 can use existing ultra-short pulse laser (such as picosecond / femtosecond laser) processing equipment to perform microstructure processing (such as opening holes, cutting, etc.) on the substrate to reduce the heat-affected zone. It can also be combined with real-time optical detection to dynamically adjust the laser power and focus position to ensure processing accuracy.

[0027] As an optional implementation, the triggering mechanism 325 includes a slider 3251 connected to the pull wire 324. The slider 3251 is slidably connected to the top of the first housing 310 via a slide rail. The sliding direction of the slider 3251 is parallel to the conveying direction of the conveyor line. A first spring 3252 is connected to the side of the slider 3251 near the synchronizing rod 323. The other end of the first spring 3252 is connected to a pressure sensor 3253 disposed at the top of the first housing 310.

[0028] In this embodiment, when the pull wire 324 is pulled, it can drive the slider 3251 to slide along the slide rail, which can reduce the loss of the pull force of the pull wire 324 due to friction. At this time, the slider 3251 can generate a squeezing force on the first spring 3252, and the first spring 3252 squeezes the pressure sensor 3253, thereby detecting the corresponding pressure data through the pressure sensor 3253. Here, a corresponding pressure threshold can be set. When the detected pressure data is greater than the pressure threshold, it can be determined that there are obvious protrusion defects such as bubbles or warping in the substrate 600. The feedback is timely, and the slider 3251 can be automatically reset by the first spring 3252 to meet the requirements of continuous online detection. At the same time, the first spring 3252 can also provide a certain resistance to the slider 3251 to prevent the trigger mechanism 325 from being accidentally triggered due to slight vibration during the transport of the conveyor line. It also has a certain function of preventing false detection, which achieves multiple benefits.

[0029] As an optional implementation, the contact plate 322 includes a movable plate 3221 connected to the lower end of the movable shaft 321, and a hollow cylinder 3222 that contacts the top surface of the substrate 600 is movably connected to the bottom of the movable plate 3221.

[0030] In this embodiment, the contact plate 322 should be made of a lightweight thin plate, and a rotatable hollow cylinder 3222 should be used to contact the top surface of the substrate 600. On the one hand, this can reduce the scratches on the substrate 600 to ensure product quality. On the other hand, it makes the overall weight of the contact plate 322 lighter, which can ensure the sensitivity of the response to protrusion defects on the substrate 600, thereby ensuring detection sensitivity.

[0031] Currently, protrusions on the substrate 600 are typically flattened using a single flattening roller. Therefore, to ensure the flattening effect, the substrate 600's moving speed needs to be reduced or stopped. This allows the flattening roller sufficient time to reciprocate and flatten the substrate 600 surface, thoroughly flattening it. However, this reduces work efficiency. Therefore, as an alternative implementation, the pressure sensor 3253 is electrically connected to a controller 330, and the controller 330 is electrically connected to a flattening mechanism 340. The detection mechanism 320 and the flattening mechanism 340 are arranged sequentially along the conveyor line. The flattening mechanism 340 includes... A first telescopic cylinder 341 is installed at the top of the first housing 310. The bottom of the first telescopic cylinder 341 is connected to a connecting frame 342 located inside the first housing 310. A rotating rod 343 is movably connected to the bottom of the connecting frame 342. A first motor 344 for driving the rotating rod 343 is provided on the outer wall of the connecting frame 342. Both the first motor 344 and the first telescopic cylinder 341 are electrically connected to the controller 330. Multiple flexible flattening components 345 are arranged in a ring array around the axis of the rotating rod 343. The flexible flattening components 345 are used to flatten warpage and / or air bubbles on the substrate 600.

[0032] In this embodiment, the pressure sensor 3253 can send the detected pressure data to the controller 330. When the controller 330 receives the pressure data and determines that it exceeds the preset pressure threshold, it can send a control signal to the first motor 344 and the first telescopic cylinder 341 to execute the corresponding action. At this time, the first telescopic cylinder 341 drives the connecting frame 342 and its connecting accessories to move down as a whole, and the first motor 344 drives the rotating roller 343 and multiple flexible flattening components 345 to rotate at a certain speed. Here, multiple flexible flattening components 345 can perform multiple flattening processes on the warping and / or air bubbles on the substrate 600, ensuring the flattening effect. Moreover, the flexible flattening components 345 have a flexible flattening function, which can prevent scratching the surface of the substrate 600. Therefore, when the substrate 600 passes through the flattening mechanism 340 via the conveyor line, it does not need to slow down or stop and can move at the normal conveying speed, further improving the working efficiency of the production line.

[0033] It should be noted that the rotation direction of the rotating roller 343 can be opposite to the conveying direction of the conveyor line. This creates a large relative speed difference between the revolution speed of the flexible flattening component 345 and the conveying speed of the conveyor line, increasing the number of times the different flexible flattening components 345 flatten the surface of the substrate 600 and ensuring full contact with the surface of the substrate 600, thereby improving the flattening effect.

[0034] As an optional implementation, the flexible flattening assembly 345 includes a connecting plate 3451 connected to the rotating roller 343. A guide groove is provided in the connecting plate 3451, which passes through the end of the connecting plate 3451. A second spring 3452 (multiple springs are evenly arranged) is connected in the guide groove. The second spring 3452 is connected to a telescopic plate 3453. A pressure roller 3454 is movably connected to one end of the telescopic plate 3453 that extends out of the guide groove. The pressure roller 3454 is used to flatten warpage and / or air bubbles on the substrate 600.

[0035] In this embodiment, when the flexible flattening component 345 contacts the surface of the substrate 600, the pressure roller 3454 first contacts the surface of the substrate 600. The pressure roller 3454 can rotate adaptively, thereby reducing wear on the surface of the substrate 600. At the same time, the second spring 3452 exerts an outward pushing force on the telescopic plate 3453, thereby ensuring that the pressure roller 3454 has sufficient pressure on the surface of the substrate 600 to flatten protruding defects. Meanwhile, when the pressure roller 3454 revolves, the second spring 3452 drives the telescopic plate 3453 to continue to extend outward, so that the pressure roller 3454 can continuously conform to different surfaces of the moving substrate 600. This ensures that each pressure roller 3454 has a large contact area with the surface of the substrate 600, further improving the flattening effect. This provides a prerequisite for ensuring the flattening effect while maintaining a constant conveying speed of the substrate 600 on the conveyor line.

[0036] As an optional implementation, the controller 330 has a built-in control module. The control module is used to control the coordinated operation of the various components of the printing unit 100. The control module stores a preset control model, and the expression of the control model is: Q=K1·(F / σ) +K2·tanθ +K3 / V+ K4·logH + K5·ΔT; ΔT < α·δ / ε; In the formula, Q represents the target printing precision, K1 is the first empirical coefficient, K2 is the second empirical coefficient, K3 is the third empirical coefficient, K4 is the fourth empirical coefficient, K5 is the fifth empirical coefficient, and F is the screen tension (preferably 9-12 N / cm). 2 σ is the surface energy of the substrate, θ is the squeegee angle (preferably 60±2°), V is the printing speed (preferably 0.3-0.8 m / min), H is the squeegee hardness (preferably 70-80 Shore A), ΔT is the stepped curing temperature (preferably 30±5℃), α is the coefficient of thermal expansion of the substrate, δ is the ink border layer thickness, and ε is the thermal strain threshold; wherein, the screen tension F is negatively correlated with the printing speed V, and the squeegee hardness H is negatively correlated with the squeegee angle θ.

[0037] In this embodiment, the target printing accuracy Q in the above formula can be a range value used to evaluate indicators such as printing pattern accuracy and adhesion. The purpose is to coordinate the key parameters of each component of the printing unit 100 (including screen tension F, squeegee angle θ, printing speed V, squeegee hardness H, and stepped curing temperature ΔT) through the target printing accuracy Q, so that the overall printing accuracy can always be maintained within a standard range, thereby ensuring the accuracy and adhesion of the printed pattern. This eliminates the need for post-printing quality inspection and allows the product to directly enter the die-cutting unit 200, further improving work efficiency and saving on quality inspection equipment costs. In the above formula, F / σ reflects the matching degree between screen tension and substrate surface energy. High tension (>12 N / cm) 2High surface energy substrates (such as plasma-treated CPI) are required; otherwise, uneven ink transfer will occur. Surface energy can be improved through Ar / O2 mixed gas plasma treatment. tanθ characterizes the effect of the doctor blade tilt angle on shear force. The reciprocal relationship of speed (K3 / V) reflects the dynamic balance. At low speeds (0.3 m / min), it ensures full filling of micron-sized meshes. At speeds > 0.8 m / min, insufficient ink leveling time leads to pinhole defects. The doctor blade hardness term, based on a logarithmic function (logH), can compensate for the nonlinear effect of hardness. If the doctor blade hardness < 70 Shore A, it will cause doctor blade deformation and increase registration error. The stepped curing temperature ΔT is used to control the distribution of internal stress. If the temperature difference > 35℃, the ink layer crack rate will increase to 15%, and the stepped curing temperature ΔT T suppresses interfacial stress through an unsteady heat transfer model, satisfying the relationship: ΔT < α·δ / ε. This model unifies and quantifies material properties, dynamic response, and thermodynamic behavior, providing a closed-loop controllable mathematical model for printing on ultra-thin flexible substrates. The aforementioned empirical coefficients K1-K5 are used to balance and adjust parameters with different properties, allowing them to be superimposed. The empirical coefficients K1-K5 can be calibrated through orthogonal experiments. Among them, screen tension F is negatively correlated with printing speed V, meaning that high tension requires synchronous speed reduction, which is compensated by parameter K3 / V for parameter K1·(F / σ). Squeegee hardness H is negatively correlated with squeegee angle θ, meaning that high-hardness squeegees require a corresponding reduction in squeegee tilt angle. By optimizing and coordinating the above key parameters, a dynamic balance of the target printing accuracy Q is achieved, preventing sudden changes in a key parameter from affecting printing quality.

[0038] As an optional implementation, the bonding unit 500 includes a second housing 510. A gripping mechanism 520 is provided on the top of the second housing 510 for gripping the substrate 600. A bonding mechanism 530 is provided at the bottom of the second housing 510 for bonding the functional layer 700 to the bottom surface of the substrate 600. A sliding groove 511 is provided on the top of the second housing 510. The gripping mechanism 520 is slidably connected to the sliding groove 511 via a sliding rail. A second telescopic cylinder 540 is provided in the second housing 510 and connected to the gripping mechanism 520. The second telescopic cylinder 540 is used to drive the gripping mechanism 520 to slide directly above the bonding mechanism 530.

[0039] In this embodiment, when bonding is required, the gripping mechanism 520 first grips the substrate 600 on the conveyor line, and then the second telescopic cylinder 540 drives the gripping mechanism 520 to slide directly above the bonding mechanism 530. Then, the bonding mechanism 530 bonds the functional layer 700 to the bottom surface of the substrate 600, thereby realizing the automatic bonding function.

[0040] As an optional implementation, the bonding mechanism 530 includes a third telescopic cylinder 531 disposed at the bottom of the second housing 510. A frame 532 is disposed on the top of the third telescopic cylinder 531. The top of the frame 532 is used to support the functional layer 700. The frame 532 is used to press the central region of the functional layer 700 onto the central region of the bottom surface of the substrate 600. A lifting assembly 533 is disposed inside the frame 532. A bracket 534 is hinged to both sides of the lifting assembly 533 by spring hinges. The two brackets 534 are symmetrically arranged on both sides of the frame 532. A pressure roller 535 is movably connected to the top of the bracket 534. The pressure roller 535 is used to press the functional layer 700 onto the bottom surface of the substrate 600.

[0041] In this embodiment, the functional layer 700 is pre-placed on top of the frame 532. The functional layer 700 is generally a flexible film. Since the top surface of the frame 532 only contacts the middle area of ​​the functional layer 700, the two sides of the middle part of the flexible film bend downwards, giving it a certain curvature. Then, the third telescopic cylinder 531 drives the frame 532 to move upwards until the frame 532 adheres the middle part of the functional layer 700 to the corresponding middle area of ​​the bottom surface of the substrate 600 (the side with the OCA adhesive layer). Then, the lifting assembly 533 drives the two side supports 534 to move upwards, so that the pressure rollers 535 at the top of the support press the two sides of the functional layer 700 firmly against the bottom surface of the substrate 600. As component 533 continues to drive bracket 534 upward, bracket 534 rotates under pressure, and the angle between bracket 534 and frame 532 increases, thereby causing the pressure roller 535 at its top to gradually press the two sides of functional layer 700 onto the bottom surface of substrate 600 in a rolling manner until functional layer 700 is completely adhered to the bottom surface of substrate 600 with low wear. In this embodiment, the method of first adhering to the middle of functional layer 700 and then adhering to both sides at the same time is adopted. Compared with the traditional method of gradually adhering from one side or directly adhering the whole, the adhering efficiency is higher, thereby further improving the working efficiency of the production line. At the same time, this adhering method also reduces the probability of bubble formation and improves product yield, achieving two goals at once.

[0042] It should be noted that the bracket 534 is hinged to both sides of the lifting assembly 533 by spring hinges. In the unpressurized state, the bracket 534 can move closer to the frame 532 under the action of the spring hinges. Only under the action of external force will the bracket 534 overcome the elasticity of the spring hinges and rotate. Therefore, when the bonding is completed, the third telescopic cylinder 531 drives the frame 532 to move down, and the lifting assembly 533 also drives the bracket 534 to move down. The bracket 534 can automatically reset under the action of the spring hinges, eliminating the need for a reset structure. At the same time, it effectively utilizes the internal space of the frame 532 to accommodate the lifting assembly 533. The lifting assembly 533, combined with the force relationship, drives the bracket 534 to rotate automatically, which is suitable for bonding operations with tight space. Furthermore, the bonding mechanism 530 of this embodiment can be applied to the bonding of flat screens or curved screens, making it highly versatile.

[0043] As an optional implementation, the lifting assembly 533 includes a second motor 5331 disposed at the top of the frame 532. The second motor 5331 is connected to a lifting screw 5332. The bottom of the lifting screw 5332 is movably connected to the bottom of the frame 532 via a bearing. A screw nut 5333 is threaded onto the lifting screw 5332. Two brackets 534 are respectively hinged to both sides of the screw nut 5333 via spring hinges. A guide vertical rod 5334 is fixedly disposed inside the frame 532 and movably passes through the screw nut 5333.

[0044] In this embodiment, when lifting is required, the second motor 5331 drives the lifting screw 5332 to rotate. Under the limiting action of the guide vertical rod 5334, the rotational motion of the lifting screw 5332 is converted into the vertical linear motion of the screw nut 5333, so as to realize the automatic lifting operation of the two supports 534. The structure is compact and suitable for lifting within the limited space of the frame 532.

[0045] As an optional implementation, the gripping mechanism 520 includes a mold base 521 slidably connected to the slide groove 511. The bottom of the mold base 521 has a forming cavity 5211 that cooperates with the substrate 600. The mold base 521 has an independent movable cavity 5212. A lifting plate 522 is provided in the movable cavity 5212. A fourth telescopic cylinder 523 is connected to the top of the lifting plate 522 and is located on the top of the mold base 521. A plurality of vacuum tubes 524 (for connecting to vacuum equipment) are provided through the lifting plate 522. The vacuum tubes 524 movably pass through the top and bottom of the mold base 521. The bottom of the vacuum tubes 524 is connected to a vacuum suction cup 525 for adsorbing the substrate 600. A blind hole 5213 for accommodating the vacuum suction cup 525 is provided at the top of the forming cavity 5211. In this embodiment, when gripping is required, the fourth telescopic cylinder 523 first moves the lifting plate 522, vacuum tube 524 and vacuum suction cup 525 downward as a whole, so that the vacuum suction cup 525 firmly adsorbs the substrate 600. Then, the fourth telescopic cylinder 523 moves the lifting plate 522 and the substrate 600 upward as a whole until the vacuum suction cup 525 is attached to the blind hole 5213. At this time, the substrate 600 is also tightly attached to the molding cavity 5211, thereby completing the automatic gripping function. The adsorption and fixation of the substrate 600 is good and the wear is low.

[0046] It should be noted that the forming cavity 5211 can be designed as a cavity structure suitable for flat screens or curved screens; the section of the vacuum tube 524 extending out of the top of the mold base 521 can be designed as a telescopic bellows, which connects to a vacuum device (not shown in the figure), thereby accommodating the up, down, left and right movements of the mold base 521.

[0047] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A folding cover manufacturing system for a display screen, characterized in that, The system includes a printing unit, a die-cutting unit, an inspection unit, a laser processing unit, and a bonding unit connected sequentially via a conveyor line. The printing unit prints an ink outline on the substrate; the die-cutting unit rolls an OCA adhesive layer onto the printed substrate and performs an overall die-cut to obtain the substrate; the inspection unit detects warping and / or bubble defects on the substrate; the laser processing unit laser processes the substrate; and the bonding unit bonds the functional layer onto the laser-processed substrate. The detection unit includes a first housing that runs through both sides. A detection mechanism is installed inside the first housing. The detection mechanism includes a movable shaft that is movably connected between the inner side walls of the first housing. A contact plate is connected to the lower end of the movable shaft. The contact plate is arranged at an inclination towards the conveyor line and is used to contact the top surface of the substrate on the conveyor line. A synchronizing rod is radially connected to the top of the movable shaft. A pull wire is connected to the top of the synchronizing rod and a triggering mechanism is connected to the pull wire.

2. The folding cover manufacturing system for a display screen as described in claim 1, characterized in that, The triggering mechanism includes a slider connected to a pull wire. The slider is slidably connected to the top of the first housing via a slide rail. The sliding direction of the slider is parallel to the conveying direction of the conveyor line. A first spring is connected to the side of the slider near the synchronizing rod. A pressure sensor located at the top of the first housing is connected to the other end of the first spring.

3. The folding cover manufacturing system for a display screen as described in claim 1, characterized in that, The contact plate includes a movable plate connected to the lower end of the movable shaft, and a hollow cylinder that contacts the top surface of the substrate is movably connected to the bottom of the movable plate.

4. A folding cover manufacturing system for a display screen as described in claim 2, characterized in that, The pressure sensor is electrically connected to a controller, and the controller is electrically connected to a flattening mechanism. The detection mechanism and the flattening mechanism are arranged sequentially along the conveyor line. The flattening mechanism includes a first telescopic cylinder located at the top of the first housing. The bottom of the first telescopic cylinder is connected to a connecting frame located inside the first housing. A rotating rod is movably connected to the bottom of the connecting frame. A first motor for driving the rotating rod is provided on the outer wall of the connecting frame. Both the first motor and the first telescopic cylinder are electrically connected to the controller. Multiple flexible flattening components are arranged in a circular array around the axis of the rotating rod. The flexible flattening components are used to flatten warpage and / or air bubbles on the substrate.

5. A folding cover manufacturing system for a display screen as described in claim 4, characterized in that, The flexible flattening assembly includes a connecting plate connected to a rotating roller. A guide groove is provided in the connecting plate, which passes through the end of the connecting plate. A second spring is connected in the guide groove. A telescopic plate is connected to the second spring. A pressure roller is movably connected to one end of the telescopic plate that extends out of the guide groove. The pressure roller is used to flatten warpage and / or air bubbles on the substrate.

6. A folding cover manufacturing system for a display screen as described in claim 4, characterized in that, The controller has a built-in control module, which controls the coordinated operation of various components in the printing unit. The control module stores a preset control model, the expression of which is: Q=K1·(F / σ) +K2·tanθ +K3 / V+ K4·logH + K5·ΔT; ΔT < α·δ / ε; In the formula, Q is the target printing precision, K1 is the first empirical coefficient, K2 is the second empirical coefficient, K3 is the third empirical coefficient, K4 is the fourth empirical coefficient, K5 is the fifth empirical coefficient, F is the screen tension, σ is the substrate surface energy, θ is the squeegee angle, V is the printing speed, H is the squeegee hardness, ΔT is the stepped curing temperature, α is the substrate thermal expansion coefficient, δ is the ink border layer thickness, and ε is the thermal strain threshold. Among these, the screen tension F is negatively correlated with the printing speed V, and the squeegee hardness H is negatively correlated with the squeegee angle θ.

7. A folding cover manufacturing system for a display screen as described in any one of claims 1-6, characterized in that, The bonding unit includes a second housing, a gripping mechanism at the top of the second housing for gripping the substrate, a bonding mechanism at the bottom of the second housing for bonding a functional layer to the bottom surface of the substrate, a sliding groove at the top of the second housing, and the gripping mechanism slidably connected to the sliding groove via a slide rail. The second housing is equipped with a second telescopic cylinder connected to the gripping mechanism for driving the gripping mechanism to slide directly above the bonding mechanism.

8. A folding cover manufacturing system for a display screen as described in claim 7, characterized in that, The bonding mechanism includes a third telescopic cylinder located at the bottom of the second housing. A frame is provided on the top of the third telescopic cylinder. The top of the frame is used to support the functional layer. The frame is used to press the central area of ​​the functional layer onto the central area of ​​the bottom surface of the substrate. A lifting assembly is provided inside the frame. Both sides of the lifting assembly are hinged to brackets via spring hinges. The two brackets are symmetrically arranged on both sides of the frame. A pressure roller is movably connected to the top of the bracket. The pressure roller is used to press the functional layer onto the bottom surface of the substrate.

9. A folding cover manufacturing system for a display screen as described in claim 8, characterized in that, The lifting assembly includes a second motor located at the top of the frame, which is connected to a lifting screw. The bottom of the lifting screw is movably connected to the bottom of the frame via a bearing. A screw thread seat is threaded onto the lifting screw. Two brackets are respectively hinged to the screw thread seat on both sides via spring hinges. A guide vertical rod that movably passes through the screw thread seat is fixedly installed inside the frame.

10. A folding cover manufacturing system for a display screen as described in claim 7, characterized in that, The gripping mechanism includes a mold base slidably connected in a groove. The bottom of the mold base has a forming cavity that mates with the substrate. The mold base has an independent movable cavity that is separate from the forming cavity. A lifting plate is installed in the movable cavity. A fourth telescopic cylinder is connected to the top of the lifting plate and is located on the top of the mold base. Multiple vacuum tubes are installed through the lifting plate. The vacuum tubes move through the top and bottom of the mold base. A vacuum suction cup for adsorbing the substrate is connected to the bottom of the vacuum tube. A blind hole for accommodating the vacuum suction cup is opened at the top of the forming cavity.

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