Edge sealing adhesive breakpoint dispensing technology

Abstract

The invention relates to the field of electronic paper displays, and discloses an edge sealing adhesive breakpoint dispensing technology, which comprises a straight line breakpoint dispensing breakpoint rule, and the straight line breakpoint dispensing breakpoint rule comprises the following steps: S1, early-stage preparation and parameter setting: selecting the specification of a dispensing needle nozzle according to the parameters of a product, setting an ideal length and a gap value of each dispensing line segment; s2, linear dispensing starting operation, wherein dispensing is started according to the set length and gap rule; s3, monitoring and adjusting the dispensing process: monitoring the dispensing condition in real time by means of a high-definition camera and a sensor, and performing fine adjustment; and S4, linear dispensing ending treatment: advancing a certain distance and gradually reducing the dispensing speed. The edge sealing adhesive breakpoint dispensing technology provided by the invention is a brand-new dispensing technology, replaces a traditional dispensing technology, solves the problem of sealing bubbles in an inherited dispensing process, reduces a subsequent defoaming process, improves the production yield, improves the production efficiency and reduces the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of electronic paper displays, and in particular to an edge sealing glue breakpoint dispensing technology. Background Art

[0002] As the wave of digital reading sweeps the world, the market demand for electronic paper products has shown explosive growth due to its significant advantages such as paper-like texture and low power consumption, attracting many companies to join the field of electronic paper production. In the assembly process of the module, the core component of electronic paper, the sealing process is a key link, which is responsible for stabilizing the internal components, isolating moisture and dust, and effectively ensuring the service life and performance of the module.

[0003] As electronic paper modules are advancing towards thinness, lightness and high precision, the shortcomings of traditional edge-sealing glue dispensing technology have become increasingly prominent. On the one hand, the edge-sealing glue itself has high fluidity, and the module dispensing gap is extremely narrow. The natural capillary effect and the unevenness of the edge of the waterproof membrane make the capillary speed of the glue liquid at different points vary greatly when it flows to fill the gap. This directly makes it difficult for air to be discharged smoothly, and a large number of bubbles are trapped inside the glue layer, forming tricky cavities after solidification. These cavities not only seriously weaken the sealing of the sealant, but also allow water vapor and dust to invade, and greatly affect the display effect of the electronic paper module, causing the product yield to be greatly reduced. On the other hand, in order to eliminate these internal bubbles, a special degassing process had to be added later, using professional equipment and spending a long time to squeeze out the gas; to make matters worse, the edge sealing glue has already solidified after the degassing is completed. Once defects such as residual bubbles and insufficient glue are found, due to its hard texture, secondary degassing and glue filling operations are difficult. The product can only be scrapped or repaired, which greatly increases production costs and employee operating burdens, and slows down the pace of production. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a breakpoint dispensing technology for edge sealing glue, which solves the problem that the traditional edge sealing glue dispensing technology causes bubble cavities due to glue liquid characteristics, gaps and waterproof film edge problems, affecting the sealing and display effects.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a glue dispensing technology for edge sealing glue breakpoints, including glue dispensing breakpoint rules for straight line breakpoints, glue dispensing rules for right angle corners, and glue dispensing rules for rounded corners; the glue dispensing breakpoint rules for straight line breakpoints include the following steps:

[0006] S1. Preliminary preparation and parameter setting: According to the product edge sealing gap width, material characteristics and glue viscosity, accurately select the specifications of the dispensing needle nozzle, measure the length of the straight line to be dispensed, and set the ideal length and gap value of each dispensing line segment in combination with the product process requirements. Enter the automatic dispensing equipment control system, and at the same time, load the edge sealing glue into the glue barrel of the dispensing equipment, preheat the glue barrel to maintain the edge sealing glue temperature at 25-30℃, and reduce the viscosity of the glue liquid; start the dispensing equipment, adjust the dispensing pressure to the initial range, generally 0.2-0.3MPa, and conduct a test spray;

[0007] S2. Linear dispensing start operation: accurately position the dispensing head to the starting end of the straight line and keep a certain distance from the edge, start the equipment, and start dispensing according to the set length and gap rules; during the dispensing process, keep moving the dispensing equipment workbench at a constant speed, and the speed is controlled at 50-80mm / s;

[0008] S3. Monitoring and adjustment of the dispensing process: With the help of high-definition cameras and sensors, the dispensing situation is monitored in real time. Every 5-10 seconds, the size and spacing of the glue droplets are automatically compared with the preset parameters. Once the glue droplets are found to be too large or too small, or the spacing is uneven, the equipment control system will immediately feedback and fine-tune the dispensing pressure and time to accurately return the glue liquid extrusion amount to the standard range;

[0009] S4. Finishing of straight line dispensing: When approaching the end of the straight line, advance a certain distance and gradually reduce the dispensing speed to smoothly complete the last section of dispensing; after dispensing, keep the dispensing head in place for 2-3 seconds to prevent the glue from shrinking.

[0010] Preferably, in step S1 of setting the straight line breakpoint dispensing breakpoint rule, the ideal length and gap value of each dispensing line segment are set as follows: conventional products adopt a "5+2" design, that is, 5mm of dispensing and 2mm of space.

[0011] Preferably, in the step S2 of setting the straight line breakpoint dispensing breakpoint rule, the distance maintained from the edge is specifically 1-2 mm.

[0012] Preferably, in step S4 of the straight line breakpoint dispensing breakpoint rule, the step of advancing a certain distance and gradually reducing the dispensing speed is specifically: advancing 3-5 mm and reducing the dispensing speed to 50%-60% of the initial speed.

[0013] Preferably, the right-angle corner dispensing rule includes the following steps:

[0014] S1. Corner pretreatment and equipment adjustment: When the dispensing equipment moves to 8-10mm away from the vertex of the right-angle corner, it automatically reduces the dispensing speed to 60%-70% of the normal speed to slow down the glue extrusion rhythm; the angle of the dispensing head is adjusted synchronously to tilt it 30°-45° toward the vertex of the corner to optimize the glue drop point and accurately cover the key corner area; the control system switches to the right-angle corner dispensing program and loads the preset corner dispensing parameters;

[0015] S2. Fine glue dispensing at corner vertices: Around the right-angle vertex, a circular glue dispensing area is defined with the vertex as the center and a radius of 2-3mm; within this area, short glue segments are evenly distributed in a circular shape, and the length of the short glue segments is set. At the same time, the glue dispensing pressure is adjusted, and a short pause of 0.5-1 second / segment is made to allow the glue to fully infiltrate the corner gap;

[0016] S3. Corner turning connection dispensing: After completing the vertex dispensing, quickly adjust the dispensing head to an angle of 135°-150° with the next edge to start the dispensing process after the turning; follow the specific dispensing mode, and gradually restore the dispensing speed from the initial slow turning speed to 80%-90% of the normal speed; within the initial 3-5mm range after the turning, slightly slow down the dispensing speed;

[0017] S4. Inspection and glue filling after corner dispensing: At the moment of right-angle corner dispensing, use the laser scanning device that comes with the dispensing equipment to quickly check the glue filling status of the corner and surrounding areas; if cavities, bubbles or insufficient glue are found, the dispensing head will automatically retract to accurately locate the defect position and perform glue filling with low flow and high frequency dispensing.

[0018] Preferably, in step S2 of the right-angle corner glue dispensing rule, short glue segments are evenly distributed in a ring shape in this area, and the length of the short glue segments is set, and the glue dispensing pressure is adjusted at the same time: 4-6 short glue segments are evenly distributed in a ring shape, each short glue segment is 1-2mm long, and the glue dispensing pressure is increased to 0.3-0.4MPa.

[0019] Preferably, in step S3 of the right-angle corner dispensing rule, the specific dispensing mode is: using the "3+1" dispensing mode, that is, dispensing 3mm and leaving 1mm of space.

[0020] Preferably, the rounded corner glue dispensing rule comprises the following steps:

[0021] S1. Adapt parameters according to the fillet radius: The dispensing equipment sensor automatically identifies the size of the fillet radius and adjusts the dispensing rules according to the size of the fillet radius;

[0022] S2. Glue dispensing start and follow - up arc operation: Align the glue - dispensing head vertically with the starting position of the rounded corner, 1 - 2 mm away from the edge, and start glue dispensing; throughout the process, rely on the multi - axis linkage function of the automated equipment to accurately follow the arc trajectory of the rounded corner, keeping the glue - dispensing head perpendicular to the curved surface of the rounded corner; the glue - dispensing speed is dynamically adjusted according to the curvature of the rounded corner. When the curvature is large, slow down appropriately to 40 - 60 mm / s, and when the curvature is small, resume to 70 - 90 mm / s.

[0023] S3. Assist penetration and stabilize the glue: While dispensing glue, the equipment vibrates the glue - dispensing head slightly at a frequency of 2 - 3 times per second, controlling the vibration intensity within a very small range to assist the glue in flowing and penetrating into the gaps of the curved surface; moderately adjust the glue flow rate and temperature according to the situation of the rounded corner. For small - radius rounded corners, appropriately reduce the glue flow rate to 70% - 80% of the normal flow rate and increase the glue temperature by 3 - 5 °C to reduce the glue viscosity; for large - radius rounded corners, keep the flow rate stable and slightly adjust the glue temperature by ±2 °C to improve the filling density.

[0024] S4. Rounded - corner finishing and quality confirmation: Near the end of the rounded corner, reduce the glue - dispensing speed a certain distance in advance and finish smoothly; after finishing, immediately use a high - definition camera and image - analysis software to check the glue filling effect in the rounded - corner area.

[0025] Preferably, in step S1 of the glue - dispensing rule for rounded - corner corners, the rule for adjusting glue dispensing according to the radius of the rounded corner is specifically as follows: When the radius of the rounded corner R ≤ 5 mm, set the glue - dispensing parameters as follows: divide the glue - dispensing segments at intervals of 10° - 15° of the central angle, with each segment having a glue - dispensing length of 2 - 3 mm and a gap of 0.5 - 1 mm; when 5 mm < R ≤ 10 mm, enable the "4 + 1.5" rule, that is, dispense glue for 4 mm and leave a 1.5 - mm gap; if the radius of the rounded corner R > 10 mm, adopt the straight - line "5 + 2" mode at the starting and ending segments of the rounded corner, and divide the glue - dispensing line segments in the middle arc segment into 6 - 8 equal parts, with the glue - dispensing length of each part adjusted flexibly according to the arc length, maintaining 3 - 5 mm and a gap of 1 - 2 mm.

[0026] Preferably, in step S4 of the glue - dispensing rule for rounded - corner corners, the statement that "reduce the glue - dispensing speed a certain distance in advance near the end of the rounded corner" specifically means: 3 - 5 mm near the end of the rounded corner.

[0027] The present invention provides a technology for dispensing glue at the break point of edge - sealing glue. It has the following beneficial effects:

[0028] 1. The present invention provides a technology for dispensing glue at the break point of edge - sealing glue, which is a brand - new glue - dispensing technology. It replaces the traditional glue - dispensing technology, solves the problem of enclosed air bubbles in the traditional glue - dispensing process, reduces the subsequent defoaming process, improves the production yield, increases the production efficiency, and reduces the production cost.

[0029] 2. The present invention sets corresponding glue dispensing rules for the actual production conditions, including straight lines, right-angle corners and rounded corners, which is highly targeted and practical. In the process of straight line glue dispensing, the width of the product edge sealing gap, material characteristics and glue viscosity are comprehensively considered in the early stage to accurately match the needle nozzle and set the ideal glue dispensing parameters. In the process, real-time monitoring and intelligent control are used to ensure that the glue is evenly and accurately extruded, and the final treatment is carefully handled to avoid the shrinkage of the glue, so as to fully guarantee the high quality and stability of the straight line segment glue sealing; at right-angle corners, the speed is reduced in advance near the corner, the angle of the glue dispensing head is cleverly adjusted, the vertex is finely glued to strengthen the seal, and the turning connection is smooth. A glue filling mechanism is also set up in the future to perfectly overcome the problems of easy accumulation of bubbles and uneven glue amount at corners; at rounded corners, the glue dispensing rules are flexibly adapted by the intelligent radius recognition system, and the glue dispensing is multi-axis linked throughout the whole process, and the speed is intelligently adjusted with the curvature. Vibration assistance and temperature and speed control methods are used to ensure that the glue fits the curved surface smoothly and fills the surface, and strict quality inspection is carried out at the end. The various rules complement each other and accurately meet the complex and changeable edge sealing requirements of electronic paper modules, greatly improving the adaptability and reliability of the overall sealing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the process of the present invention;

[0031] Figure 2 It is a flow chart of the straight line breakpoint dispensing breakpoint rule of the present invention;

[0032] Figure 3 It is a flow chart of the right-angle corner dispensing rules of the present invention;

[0033] Figure 4 The figure is a flow chart of the rounded corner glue dispensing rules of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example:

[0036] Please refer to the attached Figure 1 -Attached Figure 4 The embodiment of the present invention provides an edge sealing glue breakpoint dispensing technology, including straight line breakpoint dispensing breakpoint rules, right-angle corner dispensing rules, and rounded corner dispensing rules.

[0037] The straight line breakpoint dispensing breakpoint rule comprises the following steps:

[0038] S1. Preliminary preparation and parameter setting: According to the product edge sealing gap width, material characteristics and glue viscosity, accurately select the specifications of the dispensing needle nozzle to ensure that the glue can be squeezed out smoothly and the landing point is accurate; measure the length of the straight line to be dispensed, and set the ideal length and gap value of each dispensing line segment in combination with the product process requirements. Conventional products mostly adopt the "5+2" design, that is, 5mm for dispensing and 2mm for emptying, enter the automatic dispensing equipment control system, and at the same time load the edge sealing glue into the glue barrel of the dispensing equipment, preheat the glue barrel to maintain the edge sealing glue temperature at 25-30℃, reduce the viscosity of the glue, and facilitate the subsequent stable dispensing; start the dispensing equipment, adjust the dispensing pressure to the initial range, generally 0.2-0.3MPa, conduct a test spray, observe the glue morphology and landing point, and fine-tune to uniform glue drop size and accurate landing point;

[0039] S2. Linear dispensing start operation: accurately position the dispensing head to the starting end of the straight line, 1-2mm away from the edge, start the equipment, and start dispensing according to the set length and gap rules; during the dispensing process, keep moving the dispensing equipment workbench at a constant speed, and control the speed at 50-80mm / s to ensure that the glue is extruded evenly and continuously to form a regular dispensing line segment, and the glue fully penetrates the gap;

[0040] S3. Monitoring and adjustment of the dispensing process: With the help of high-definition cameras and sensors, the dispensing situation is monitored in real time. Every 5-10 seconds, the size and spacing of the glue droplets are automatically compared with the preset parameters. Once the glue droplets are found to be too large or too small, or the spacing is uneven, the equipment control system will immediately feedback and fine-tune the dispensing pressure and time to accurately return the glue extrusion volume to the standard range. At the same time, pay attention to the glue penetration. If the gap is too narrow and the glue penetration is slow, stop dispensing in time, fine-tune the glue temperature or increase the short pause time to assist the glue penetration.

[0041] S4. Finishing treatment of straight line dispensing: When approaching the end of the straight line, gradually reduce the dispensing speed to 50%-60% of the initial speed 3-5mm in advance to smoothly complete the last section of dispensing; after dispensing, keep the dispensing head in place for 2-3 seconds to prevent the glue from shrinking, ensure that the glue at the end is full and stable, and there is no gap left, laying a solid foundation for subsequent processes.

[0042] The right-angle corner dispensing rule includes the following steps:

[0043] S1. Corner pretreatment and equipment adjustment: When the dispensing equipment moves to 8-10mm away from the vertex of the right-angle corner, it automatically reduces the dispensing speed to 60%-70% of the normal speed to slow down the glue extrusion rhythm; the angle of the dispensing head is adjusted synchronously to tilt it 30°-45° toward the vertex of the corner to optimize the glue drop point and accurately cover the key corner area; the control system switches to the right-angle corner dispensing program and loads the preset corner dispensing parameters;

[0044] S2. Fine dispensing at the corner vertex: Around the right-angle vertex, a circular dispensing area is demarcated with the vertex as the center and a radius of 2 - 3 mm; within this area, 4 - 6 short glue segments are evenly distributed in a ring, each short glue segment is 1 - 2 mm long, the dispensing pressure is increased to 0.3 - 0.4 MPa, and a short pause of 0.5 - 1 second / segment is made to allow the glue liquid to fully infiltrate the corner gap and diffuse to the surrounding by capillary action, strengthening the vertex seal and structural stability;

[0045] S3. Glue dispensing at the corner transition connection point: After completing the vertex dispensing, quickly adjust the dispensing head to an angle of 135° - 150° with the next edge and start the dispensing process for the part after the turn; continue to use the "3 + 1" dispensing mode, that is, dispense for 3 mm and leave 1 mm empty, and the dispensing speed gradually recovers from the initial slow speed to 80% - 90% of the normal speed to ensure smooth connection and prevent glue liquid from accumulating and flowing; within the starting 3 - 5 mm range after the turn, slightly slow down the dispensing speed to make the glue liquid transition smoothly and fill the tiny gaps generated by the corner turn;

[0046] S4. Inspection and glue replenishment after corner dispensing: At the moment when the right-angle corner dispensing is completed, use the laser scanning device自带 by the dispensing equipment to quickly inspect the glue filling situation in the corner and the surrounding area; if cavities, bubbles or insufficient glue amount are found, automatically retract the dispensing head to accurately locate the defect position, and perform glue replenishment in a low-flow and high-frequency dispensing manner. After glue replenishment, scan again to confirm until it meets the quality standard.

[0047] The rules for dispensing at the rounded corner include the following steps:

[0048] S1. Adapt parameters according to the rounded corner radius: The sensor of the dispensing equipment automatically identifies the size of the rounded corner radius. When the rounded corner radius R ≤ 5 mm, set the dispensing parameters as follows: divide the dispensing segments at intervals of 10° - 15° of the central angle, each dispensing segment is 2 - 3 mm long, and the gap is 0.5 - 1 mm; when 5 mm < R ≤ 10 mm, enable the "4 + 1.5" rule, that is, dispense for 4 mm and leave 1.5 mm empty; if the rounded corner radius R > 10 mm, use the straight line "5 + 2" mode at the starting and ending segments of the rounded corner, and divide the dispensing line segments into 6 - 8 equal parts for the middle arc segment. The length of each dispensing segment is flexibly adjusted according to the arc length, maintaining 3 - 5 mm, and the gap is 1 - 2 mm;

[0049] S2. Operations for starting and following the arc during dispensing: Align the dispensing head vertically with the starting position of the rounded corner, 1 - 2 mm away from the edge, and start dispensing; throughout the process, rely on the multi-axis linkage function of the automated equipment to accurately follow the rounded corner arc trajectory and keep the dispensing head perpendicular to the rounded corner curved surface; the dispensing speed is dynamically adjusted according to the curvature of the rounded corner, appropriately slowed down to 40 - 60 mm / s at the place with large curvature, and restored to 70 - 90 mm / s at the place with small curvature to ensure uniform and smooth distribution of the glue liquid;

[0050] S3. Assisting penetration and stabilizing the glue: While dispensing, the equipment slightly vibrates the dispensing head at a frequency of 2-3 times per second, and the vibration intensity is controlled within a very small range to assist the glue to flow and penetrate in the gaps of the curved surface; the glue flow rate and temperature are appropriately adjusted according to the fillet conditions. For small radius fillets, the glue flow rate is appropriately reduced to 70%-80% of the normal flow rate, and the glue temperature is increased by 3-5℃ to reduce the viscosity of the glue; for large radius fillets, the flow rate is kept stable, and the glue temperature is fine-tuned by ±2℃ to improve the filling density;

[0051] S4. Finishing of fillet and quality confirmation: When approaching the end of the fillet, reduce the dispensing speed 3-5mm in advance to finish smoothly; after finishing, immediately use a high-definition camera and image analysis software to check the glue filling effect of the fillet area. If there are problems such as discontinuity of glue, bubbles, etc., automatically perform a local glue filling procedure until the glue completely and evenly fills the fillet gap to meet the product edge sealing quality requirements.

[0052] Comparative experiment:

[0053] 1. Experimental purpose:

[0054] Through comparative experiments, the advantages of the edge sealing glue breakpoint dispensing technology of the present invention (including breakpoint dispensing rules for straight line breakpoints, dispensing rules for right-angle corners, and dispensing rules for rounded corners) over traditional dispensing technology in key indicators such as bubble generation rate, dispensing accuracy, production efficiency, and product yield are intuitively demonstrated, providing data support for the promotion and application of technology.

[0055] 2. Experimental materials and equipment:

[0056] Materials: Prepare several electronic paper display modules of the same batch and specifications to simulate actual production products; select edge-sealing glue specially used for electronic paper production to ensure that the batches and performance of the glue are consistent; the waterproof film material meets the packaging requirements of the electronic paper module, and the edges are laser cut to simulate actual working conditions.

[0057] Equipment: Two high-precision automatic dispensing devices, one equipped with the breakpoint dispensing technology program of the present invention, and the other for traditional linear dispensing; several high-definition cameras for monitoring and recording the dispensing process; a laser scanning device to detect the gap filling after dispensing; an electron microscope to assist in viewing the details of tiny bubbles and glue penetration; a high-precision timer to record the operation time; an electronic balance to weigh the dispensing amount; a constant temperature box to maintain a constant experimental environment temperature (set at 25°C).

[0058] 3. Experimental steps:

[0059] All electronic paper modules to be glued were numbered and randomly divided into an experimental group (using the breakpoint glue dispensing technology of the present invention) and a control group (using the traditional glue dispensing technology), with 30 module samples in each group to ensure the randomness and representativeness of the samples.

[0060] The edge sealing glue was loaded into the corresponding glue barrels of the dispensing equipment respectively, and the glue barrels of the experimental group were preheated to 25-30℃ according to their respective technical requirements, while the glue barrels of the control group were maintained at room temperature; the initial parameters of the dispensing equipment were debugged, and the experimental group entered the parameters according to the "5+2" straight lines, right-angle corners and rounded corners rules set in the early stage, and the control group was set to the traditional linear dispensing conventional pressure (0.3-0.4MPa) and uniform dispensing speed (80-100mm / s).

[0061] 4. Dispensing operation:

[0062] Straight line dispensing:

[0063] Experimental group: According to the dispensing breakpoint rules of the straight line, the dispensing head accurately positioned 1-2mm from the starting end of the module straight line, and dispensed glue at a speed of 50-80mm / s and a "5+2" mode; every 5-10 seconds, the equipment fine-tuned the parameters based on the feedback from the high-definition camera and sensor; 3-5mm near the end, the speed was reduced to 25-30mm / s, and a pause of 2-3 seconds was made after the end.

[0064] Control group: Glue was dispensed continuously from the starting end of the straight line at a constant speed of 80-100 mm / s without any breakpoints, and the glue was continuously extruded until the end of the straight line.

[0065] Right-angle corner dispensing:

[0066] Experimental group: When 8-10mm away from the right-angle corner, the equipment automatically slows down to 24-28mm / s, and the dispensing head tilts 30°-45°; at the apex, 4-6 1-2mm short rubber segments are evenly distributed in a ring with a radius of 2-3mm, the pressure is increased to 0.3-0.4MPa, and the pause is 0.5-1 second / segment; after the turn, the "3+1" mode is used to gradually increase the speed.

[0067] Control group: No deceleration or special operation at the corners. The machine passes through the corners at the straight-line dispensing speed and method, relying on the natural flow of glue to cover the corners.

[0068] Round corner glue dispensing:

[0069] Experimental group: The equipment identifies the fillet radius and sets parameters according to the rules. For example, if R≤5mm, it is divided into sections according to the central angle of 10°-15°. The dispensing speed is 40-60mm / s (when the curvature is large) or 70-90mm / s (when the curvature is small), and the dispensing head vibrates synchronously. Other radii are operated according to the corresponding rules.

[0070] Control group: glue was dispensed around the fillet at a uniform speed of 80-100 mm / s without any subdivision strategy.

[0071] 5. Testing and data recording:

[0072] After the dispensing is completed, the laser scanning device is immediately used to check the filling of the gaps in various parts of the module, and the number of bubbles and the volume of the cavity are counted; with the help of an electron microscope, the corners and fine gaps are magnified and observed to accurately determine the penetration depth and continuity of the glue liquid; the weight of the glue barrel before and after dispensing is weighed by an electronic balance to calculate the actual amount of glue dispensed; the high-definition camera records the dispensing trajectory throughout the process and analyzes the dispensing accuracy (glue drop size, spacing consistency).

[0073] Record the time taken to dispense glue for each group of each module, from starting the equipment to completing all dispensing actions; count the number of modules that need to be repaired due to defects such as bubbles and insufficient glue; put the finished modules into a reliability testing device that simulates the use environment, run it for 100 hours, record the number of modules that fail due to edge sealing problems, and calculate the yield.

[0074] 6. Experimental results:

[0075]

[0076]

[0077] From the experimental results, it can be seen that the edge sealing glue dispensing technology of the present invention is significantly superior to the traditional dispensing technology in reducing bubble generation, improving dispensing accuracy, shortening dispensing time, reducing rework volume, and improving product yield, which effectively verifies the advantages and practical value of the new technology. It should be noted that the values ​​will fluctuate due to slight differences in materials and equipment in actual production applications, but the trend remains unchanged.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A technology for dispensing edge sealant at breakpoints, characterized in that: It includes straight line breakpoint dispensing breakpoint rules, right angle corner dispensing rules, and rounded corner dispensing rules; the straight line breakpoint dispensing breakpoint rules include the following steps: S1. Preliminary preparation and parameter setting: According to the product edge sealing gap width, material characteristics and glue viscosity, accurately select the specifications of the dispensing needle nozzle, measure the length of the straight line to be dispensed, and set the ideal length and gap value of each dispensing line segment in combination with the product process requirements. Enter the automatic dispensing equipment control system, and at the same time, load the edge sealing glue into the glue barrel of the dispensing equipment, preheat the glue barrel to maintain the edge sealing glue temperature at 25-30℃, and reduce the viscosity of the glue liquid; start the dispensing equipment, adjust the dispensing pressure to the initial range, generally 0.2-0.3MPa, and conduct a test spray; S2. Linear dispensing start operation: accurately position the dispensing head to the starting end of the straight line and keep a certain distance from the edge, start the equipment, and start dispensing according to the set length and gap rules; during the dispensing process, keep moving the dispensing equipment workbench at a constant speed, and the speed is controlled at 50-80mm / s; S3. Monitoring and adjustment of the dispensing process: With the help of high-definition cameras and sensors, the dispensing situation is monitored in real time. Every 5-10 seconds, the size and spacing of the glue droplets are automatically compared with the preset parameters. Once the glue droplets are found to be too large or too small, or the spacing is uneven, the equipment control system will immediately feedback and fine-tune the dispensing pressure and time to accurately return the glue liquid extrusion amount to the standard range; S4. Finishing of straight line dispensing: When approaching the end of the straight line, advance a certain distance and gradually reduce the dispensing speed to smoothly complete the last section of dispensing; after dispensing, keep the dispensing head in place for 2-3 seconds to prevent the glue from shrinking.

2. The edge sealing glue breakpoint dispensing technology according to claim 1 is characterized in that: In step S1 of the straight line breakpoint dispensing breakpoint rule, the ideal length and gap value of each dispensing line segment are set as follows: conventional products adopt a "5+2" design, that is, 5mm of dispensing and 2mm of space.

3. The edge sealing glue breakpoint dispensing technology according to claim 1 is characterized in that: In the step S2 of the straight line breakpoint dispensing breakpoint rule, the distance maintained from the edge is specifically: 1-2mm.

4. The edge sealing glue breakpoint dispensing technology according to claim 1 is characterized in that: In step S4 of the straight line breakpoint dispensing breakpoint rule, the step of advancing a certain distance and gradually reducing the dispensing speed is specifically: advancing 3-5 mm and reducing the dispensing speed to 50%-60% of the initial speed.

5. The edge sealing glue breakpoint dispensing technology according to claim 1, characterized in that: The right-angle corner dispensing rule includes the following steps: S1. Corner pretreatment and equipment adjustment: When the dispensing equipment moves to 8-10mm away from the vertex of the right-angle corner, it automatically reduces the dispensing speed to 60%-70% of the normal speed to slow down the glue extrusion rhythm; the angle of the dispensing head is adjusted synchronously to tilt it 30°-45° toward the vertex of the corner to optimize the glue drop point and accurately cover the key corner area; the control system switches to the right-angle corner dispensing program and loads the preset corner dispensing parameters; S2. Fine glue dispensing at corner vertices: Around the right-angle vertex, a circular glue dispensing area is defined with the vertex as the center and a radius of 2-3mm; within this area, short glue segments are evenly distributed in a circular shape, and the length of the short glue segments is set. At the same time, the glue dispensing pressure is adjusted, and a short pause of 0.5-1 second / segment is made to allow the glue to fully infiltrate the corner gap; S3. Corner turning connection dispensing: After completing the vertex dispensing, quickly adjust the dispensing head to an angle of 135°-150° with the next edge to start the dispensing process after the turning; follow the specific dispensing mode, and gradually restore the dispensing speed from the initial slow turning speed to 80%-90% of the normal speed; within the initial 3-5mm range after the turning, slightly slow down the dispensing speed; S4. Inspection and glue filling after corner dispensing: At the moment of right-angle corner dispensing, use the laser scanning device that comes with the dispensing equipment to quickly check the glue filling status of the corner and surrounding areas; if cavities, bubbles or insufficient glue are found, the dispensing head will automatically retract to accurately locate the defect position and perform glue filling with low flow and high frequency dispensing.

6. The edge sealing glue breakpoint dispensing technology according to claim 5, characterized in that: In step S2 of the right-angle corner dispensing rule, short glue segments are evenly distributed in a ring shape in this area, and the length of the short glue segments is set. At the same time, the dispensing pressure is adjusted specifically as follows: 4-6 short glue segments are evenly distributed in a ring shape, each short glue segment is 1-2mm long, and the dispensing pressure is increased to 0.3-0.4MPa.

7. The edge sealing glue breakpoint dispensing technology according to claim 5, characterized in that: In step S3 of the right-angle corner dispensing rule, the specific dispensing mode is: using the "3+1" dispensing mode, that is, dispensing 3mm and leaving 1mm of space.

8. The edge sealing glue breakpoint dispensing technology according to claim 1, characterized in that: The fillet corner dispensing rule includes the following steps: S1. Adapt parameters according to fillet radius: The dispensing equipment sensor automatically identifies the size of the fillet radius and adjusts the dispensing rules according to the size of the fillet radius; S2. Operation of dispensing start and following the arc: align the dispensing head vertically with the starting position of the fillet, 1-2mm away from the edge, and start dispensing; use the multi-axis linkage function of the automation equipment throughout the process to accurately follow the arc trajectory of the fillet and keep the dispensing head perpendicular to the fillet surface; the dispensing speed is dynamically adjusted according to the curvature of the fillet, and the speed is appropriately slowed down to 40-60mm / s at large curvatures and restored to 70-90mm / s at small curvatures; S3. Assisting penetration and stabilizing the glue: While dispensing, the equipment slightly vibrates the dispensing head at a frequency of 2-3 times per second, and the vibration intensity is controlled within a very small range to assist the glue to flow and penetrate in the gaps of the curved surface; the glue flow rate and temperature are appropriately adjusted according to the fillet conditions. For small radius fillets, the glue flow rate is appropriately reduced to 70%-80% of the normal flow rate, and the glue temperature is increased by 3-5℃ to reduce the viscosity of the glue; for large radius fillets, the flow rate is kept stable, and the glue temperature is fine-tuned by ±2℃ to improve the filling density; S4. Corner fillet finishing and quality confirmation: When approaching the end of the fillet, reduce the dispensing speed a certain distance in advance to finish smoothly; after finishing, immediately use a high-definition camera and image analysis software to check the glue filling effect of the fillet area.

9. The edge sealing glue breakpoint dispensing technology according to claim 8, characterized in that: In step S1 of the round-corner dispensing rule, the rule for adjusting dispensing according to the size of the round-corner radius is specifically as follows: when the round-corner radius R ≤ 5 mm, the dispensing parameters are set as follows: the dispensing segments are divided at intervals of the central angle of 10° - 15°, the length of each dispensing segment is 2 - 3 mm, and the gap is 0.5 - 1 mm; when 5 mm < R ≤ 10 mm, the "4 + 1.5" rule is enabled, that is, dispense for 4 mm and leave a blank of 1.5 mm; if the round-corner radius R > 10 mm, in the starting and ending segments of the round corner, the straight-line "5 + 2" mode is adopted, and in the middle arc segment, the dispensing line segments are evenly divided into 6 - 8 equal parts, and the length of each dispensing part is flexibly adjusted according to the arc length, maintaining 3 - 5 mm, and the gap is 1 - 2 mm.

10. The edge sealing glue breakpoint dispensing technology according to claim 8, characterized in that: In step S4 of the round-corner dispensing rule, reducing the dispensing speed a certain distance in advance near the end of the round corner is specifically as follows: 3 - 5 mm near the end of the round corner.

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