A process for repairing an FPC reinforcement plate

Abstract

The application relates to the field of FPC reinforcing, and discloses a process for repairing an FPC reinforcing plate, which comprises the following steps: first step: collecting various models of PCBs, and judging whether replacement or disassembly is needed; second step: when replacement of buckles is needed, after replacement is completed, scanning can be performed to output after detection shows that there is no problem; third step: disassembling buckles and steel sheets; fourth step: pressing the steel sheets, and then baking the steel sheets; and fifth step: performing appearance detection, and performing normal batch repair after confirming that there is no problem. The process for repairing the FPC reinforcing plate solves the problem of replacement and repair process of the reinforcing plate deformation defect, the reinforcing plate replacement process can be used for repairing under the condition of not disassembling and repairing Bonding, can fully meet the demand of not returning Bonding of customers, and greatly reduces production operation processes and cost reduction.

Description

Technical Field

[0001] This invention relates to the field of FPC reinforcement, specifically to a process for repairing FPC reinforcement plates. Background Technology

[0002] During the production of module products, the appearance of the reinforcing plates in the later stages is deformed due to process factors, which is not in accordance with standards. This accounts for as high as 39.65% of the repair bonding, and cannot be repaired normally. It is necessary to disassemble and rework the bonding for repair. However, due to customer requirements, rework bonding is not allowed. To meet the customer's requirements, there is a direct financial loss of 260,000 RMB per month, resulting in the direct scrapping of products and an increase in costs. Even if disassembly and rework bonding could be carried out, the process is complicated, and the resulting material consumption, product scrapping, and poor yield are a series of problems that increase costs and waste. The goal is to meet the customer's requirement of not rework bonding, while also simplifying the repair process, improving repair efficiency and yield, and reducing cost waste.

[0003] The current repair process for deformed reinforcing plates has been summarized.

[0004] Repairable: Defective reinforcing plates require 100% rework and bonding. The disassembly process of rework and bonding will cause the BL to be scrapped, CG to be scratched, paint to be peeled off, edge to be chipped, OCA to be 100% scrapped, POL to be scratched, LCD to be broken, OIT to be scratched, corrosion, etc., which will increase the risk of scrapping the main materials, increase the difficulty of repair, production operations and labor costs, and rework will also increase the risk of scrapping.

[0005] Non-repairable: 100% must be scrapped.

[0006] Our industry survey revealed that customer complaints regarding deformed reinforcing plates have been reported across the entire module industry. Major companies lack effective solutions for addressing this issue without disassembling and re-bonding the reinforcing plates. Therefore, we have proposed a process for repairing FPC reinforcing plates. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this invention provides a process for repairing FPC reinforcing plates, which solves the aforementioned problems.

[0009] (II) Technical Solution

[0010] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a process for repairing FPC reinforcing plates, comprising the following steps:

[0011] Step 1: Gather the PCBs of each model and determine whether they need to be replaced or disassembled.

[0012] Step 2: When the buckle needs to be replaced, after the replacement is completed and the problem is checked, you can scan the code to transfer the money.

[0013] Step 3: Disassemble the clips and steel plates;

[0014] Step 4: Press the steel sheets together, and then bake the steel sheets.

[0015] Step 5: Conduct visual inspection. After confirming that there are no problems, proceed with normal batch rework.

[0016] Preferably, the detection steps in the second step are as follows:

[0017] S1: Full inspection with a magnifying glass;

[0018] S2: Full electrical test;

[0019] S3: QC magnifying glass inspection;

[0020] S4: Inspection passed and stamped, ready for transfer.

[0021] Preferably, if the steel sheet is scrapped in the third step, it is replaced in the second step.

[0022] Preferably, the temperature for disassembling the buckle in the third step is 250 degrees Celsius, and the temperature for disassembling the steel sheet is 180 degrees Celsius.

[0023] Preferably, in the fourth step, the steel sheet faces upwards when it is pressed together and downwards when it is baked.

[0024] Preferably, the pressing conditions in the fourth step are 260N, the baking temperature is 200℃, and the time is 10S.

[0025] Preferably, the visual inspection in the fifth step is a comparison and confirmation with the specifications of steel sheet samples of various models.

[0026] (III) Beneficial Effects

[0027] Compared with the prior art, the present invention provides a process for repairing FPC reinforcing plates, which has the following beneficial effects:

[0028] 1. The process for repairing this FPC reinforcing plate solves the problem of replacing and repairing deformed reinforcing plates. This process allows for repair without disassembling and re-repairing the bonding, which can fully meet the customer's requirement of not needing to re-repair the bonding, while greatly reducing the production process and costs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the process of the present invention;

[0030] Figure 2 This is a schematic diagram of peel force data;

[0031] Figure 3 Schematic diagram of DOE verification of optimal conditions for 1058B pressure baking;

[0032] Figure 4 This is a schematic diagram of peel force and tensile test data;

[0033] Figure 5 This is a schematic diagram of the inspection standard;

[0034] Figure 6 This is a data reference diagram for the model. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] FOG, TFOG, and TDM product status; complete the replacement and repair process for defective reinforcement plates.

[0037] Set the disassembly temperature setting, complete the disassembly of the clips, and then disassemble the reinforcing plate;

[0038] After the product is disassembled, the reinforcing plate is replaced and attached in place. The reinforcing plate is then pressed together. The effect after pressing is confirmed and checked. Once OK, the clips are welded. The welding effect of the reinforcing plate and clips is checked and confirmed. The appearance of the reinforcing plate is checked to ensure it is not displaced, and the electrical performance is OK.

[0039] Subsequent defective reinforcing plates no longer require rework bonding during the repair process, greatly improving production efficiency, saving manpower, and reducing the associated material consumption of related processes.

[0040] Standard repair process for defective reinforcing plates:

[0041] a. Returnable Bonding Products:

[0042] Repairing FOG-condition products: Requires disassembling the FPC, cleaning the FOG ACF adhesive, inspecting for ITO under a microscope, and then reworking the product according to the established process flow.

[0043] TFOG status product repair: requires insert freezing - disassemble CG - remove OAC glue - apply POL protective film - remove copper foil - remove silver paste - remove surface adhesive - disassemble FPC - clean FOG ACF glue - microscopic inspection - OK and put back on the production line for rework according to the product process flow;

[0044] TDM status product repair: Requires disassembling the BL - removing the POL protective film - freezing the insert - disassembling the CG - removing the OAC adhesive - removing the protective film - removing the copper foil - removing the silver paste - removing the surface adhesive - disassembling the FPC - cleaning the FOG ACF adhesive - microscopic inspection - OK products can be reworked according to the product process flow.

[0045] b. No returns of Bonding products allowed (customer requirement): Returned Bonding products must be scrapped.

[0046] TDM: The average monthly number of defective bonding plates is 8070 pieces, and the average monthly number of defective reinforcing plates is 3200 pieces, with reinforcing plates accounting for 39.65% of the total defects.

[0047] Disassemble FPC clips - Identify faulty reinforcing plates - Align and attach reinforcing plates - Press and seal reinforcing plates - Weld clips - Inspection

[0048] Returnable Bonded Products: 4806 pieces were returned to the manufacturer; 768 pieces had defects such as scratches, corrosion, and broken screens, resulting in a scrap rate of 16%. 5% of the main materials were scrapped due to related losses (BL, CG, OCA, POL, IC, FPC).

[0049] Products that cannot be repaired: These products are scrapped immediately, resulting in a 100% loss.

[0050] After the non-repairable Bonding reinforcement plate defect replacement and repair process: (Bonding products that can and cannot be repaired) 3633pcs of defective reinforcement plates were repaired, and 3pcs were peeled or broken, with a defect rate of 0.08%.

[0051] By introducing a reinforcement plate replacement repair process, re-bonding is eliminated. This not only meets the customer's requirement that re-bonding is not permitted, but also represents a significant innovation in simplifying the factory's cumbersome repair procedures.

[0052] Sixty samples of the reinforcing plate replacement and repair were subjected to high temperature and high humidity tests, thermal shock tests, high temperature storage tests, low temperature storage tests, vibration tests, and drop tests. It was confirmed that there were no abnormalities in electrical testing, salt spray storage, and appearance, and the performance tests were confirmed to be OK.

[0053] See Figure 2 Feasibility assessment conclusion: The peel force data in both sets meet the standards. The thermal stress data also meet the standards, and the reinforcement plate can be repaired.

[0054] See Figure 3 Verification conclusion: All 6 sets of condition data results met the standards. There was no difference in thickness between normal and reworked steel sheets. Optimization of process parameters was feasible. The optimal process conditions of the 6th set were selected: 260N, 200℃, 10S for batch rework.

[0055] See Figure 4 The peel strength and tensile strength data must be >1.0Kgf / cm to be considered qualified;

[0056] Serial numbers 1-10 are for rework batches with the following conditions: 260N, 200℃, 10S;

[0057] Items numbered 11-15 are normal products;

[0058] Conclusion: By comparing the values ​​of groups b and c, and considering that all 10 pieces of group b met the peel force test standard and showed no difference from the peel force data of the normal product in group C, the peel force test, one of the reliability tests, was qualified.

[0059] Final conclusion:

[0060] Verify different operating parameters and select the optimal process parameters: 200 degrees Celsius, 260 N, 10 s; (Verification has been passed).

[0061] Trustworthiness verification:

[0062] a. The peel force test value is qualified, and there is no difference between normal products and rework products (remedial repair can be carried out);

[0063] b. The appearance of the 10 salt spray test specimens is OK, the functional test is OK, there is no risk of failure later, and the salt spray test is qualified.

[0064] The specific details of this plan are as follows:

[0065] A process for repairing FPC reinforcing plates includes the following steps:

[0066] Step 1: Gather the PCBs of each model and determine whether they need to be replaced or disassembled.

[0067] Step 2: When the buckle needs to be replaced, after the replacement is completed and the problem is checked, you can scan the code to transfer the money.

[0068] Step 3: Disassemble the clips and steel plates;

[0069] Step 4: Press the steel sheets together, and then bake the steel sheets.

[0070] Step 5: Conduct visual inspection. After confirming that there are no problems, proceed with normal batch rework.

[0071] The detection steps in the second step are as follows:

[0072] S1: Full inspection with a magnifying glass;

[0073] S2: Full electrical test;

[0074] S3: QC magnifying glass inspection;

[0075] S4: Inspection passed and stamped, ready for transfer.

[0076] If the steel sheet is scrapped in the third step, proceed to the second step for replacement.

[0077] In the third step, the temperature for disassembling the buckle is 250 degrees Celsius, and the temperature for disassembling the steel sheet is 180 degrees Celsius.

[0078] In the fourth step, the steel sheet faces upwards when it is pressed together and downwards when it is baked.

[0079] In the fourth step, the pressing conditions are 260N, the baking temperature is 200℃, and the time is 10S.

[0080] The visual inspection in the fifth step involves comparing and confirming the specifications of steel sheet samples of various models.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A process for FPC reinforcement board repair, characterized by, It comprises the following steps: First step: concentrate various models of PCB, judge whether to replace or disassemble; Second step: when the buckle needs to be replaced, after replacement, detect no problem and then scan the code to transfer out; Third step: disassemble the buckle and steel sheet; Fourth step: press the steel sheet, then bake the steel sheet; Fifth step: perform appearance detection, and then perform normal batch repair after confirming that there is no problem; The detection step in the second step is as follows: S1: magnifying glass full detection; S2: full detection by electrical measurement; S3: QC magnifying glass full detection; S4: stamping for detection, and preparing to transfer out; If the steel sheet is scrapped in the third step, go to the second step to replace; The disassembly temperature of the buckle in the third step is 250 degrees Celsius, and the disassembly temperature of the steel sheet is 180 degrees Celsius; In the fourth step, the steel sheet is pressed upwards when the steel sheet is pressed, and the steel sheet is downwards when the steel sheet is baked; The pressing condition in the fourth step is 260N, the baking temperature is 200℃, and the time is 10S.

2. The process for repairing a FPC stiffener according to claim 1, wherein: The appearance detection in the fifth step is to compare and confirm the specifications of various models of steel sheet samples.

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