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  • PCB printing screen production process
     
    Date :2017-8-13

     

    One
    Stretching steps: net frame cleaning - the level of calibration - the bottom of the plastic - pull the net - measured tension - coated viscose - under the net, Edge - storage
    Job Description:
    1. Repeated use of the network frame, the network box around the residual glue, mesh and other debris, must be clean, so as not to affect the adhesion of the mesh and the network frame.
    2. Place the web frame on the platform (level) to check whether the frame is deformed. If there is any deformation, it will need to be leveled.
    3. will clean up, no deformation of the network box and the mesh and then the surface of the Pu and even a layer of glue without hardening agent in order to enhance the net after the net and the network frame adhesive force.
    4. After about 10 minutes of gelatinization, place the web frame on the web and adjust the relative position and height
    5. Select the mesh, loosen the knuckle around, the mesh will be tiled on the box, and then evenly inserted into the jaws of the net, can not have wrinkles, pay attention to the four corners have loose yarn, Need to lock, between the clip and the clip can not have a gap (automatic lift, manual pull as an example).
    6. Stretch: the first tension of 26, standing for 5 minutes tension of 24; second tension 28, standing 5 minutes tension 26; third tension 32, standing 5 minutes tension 30; fourth correction 5 points tension 32, put on 20 minutes after the glue tension 30; 15 minutes gel curing under the net tension 28, standing 72 hours before the production of screen (to one meter × one meter automatic production line using the screen as an example). (100T, 110T, 120T are 30 ± 2 Newton) (77T, 51T are 35 ± 2 Newton) (24T is the same time, when the tension is pulled, 50 ± 2 Newton)
    7. will have a good tune with a small brush brush evenly brush in the network frame and mesh above the surface, not the glue into the middle of the screen, to be 8 minutes after the glue dry, available scraper glue in the coating surface will not Fully fit the place to tighten the paste about 10 minutes after the glue completely dry (should be used to open the dry hair to dry) before the net.
    8. Use a paper cutter to remove the extra mesh around the screen, and indicate the date, mesh, and net tension (in order to observe the tension change) in order to prevent the penetration of the water (water white) The inner corner of the frame is sealed with red glue, and then sealed with a waterproof tape on the web frame and the mesh, and the same is prevented from infiltration.


    Two
    1. Wash the net: with the grinder ointment to the grease (new network), ghost shadow paste to the graphics (old network), in addition to pulp to the net pulp, blue oil, with anti-white water debris, wash the net with detergent, and finally Rinse with a high pressure water gun, and finally clean with pure water.
    2. Drying: - Oven set the temperature should be less than 48 degrees Celsius.
    3. Use premium film method: clean the net and then clean the water once. According to the project film film to increase about 20% of the selected water film, with a triangular force to suppress the water film end of the film on the Internet, then slowly with the triangular scratched up, and then squeeze the plastic scraper, towel wipe excess water Drying.
    4. Use photoresist (mesh): drying plate and then on the photoresist, the use of scraping box, will be scraped to the Internet, which silk screen green oil to be sizing three times, (about every 10 minutes or more time) silk screen other anti-corrosion Ink is the second, silk screen can be stripped of plastic (blue plastic) on the first 50 microns water film tear film, and then on the 2 times the net pulp, each scraping three times, after the completion of sizing.
    (Green oil, base oil, surface oil) with 120T, 100T, 110T mesh, carbon paste (carbon oil) 51T, silk screen can be stripped of ink (Blue plastic) 24T silk screen photosensitive circuit and heat curing ink with 77T.
    6. The selection of the line with the film 18K water film (without photoresist with a sensitive adhesive online easy to produce: such as burr (dog teeth) and other issues), other anti-corrosion ink (green oil, base oil, surface oil) Glue (net pulp), carbon slurry (carbon oil) selection of 50 micron water film
    7. With the required engineering graphics film attached to the location of the screen selection, placed on the light machine for light, the time of choice (3000W spotlight), the line is generally 60-80 seconds, green oil in the 80-100 seconds, the bottom character oil 40-60 seconds, carbon oil, blue plastic 350-400 seconds
    8. Press the water red, dry.
    9. After making the screen made of sealing glue (blue oil) will not be on the screen by the film or photoresist cover the place, with a silk screen scraper scraped plastic, dry.
    10. Check, repair network, write the completion date and the corresponding number and record the archive, storage.


    Storage
    Storage is usually stored vertically, can be self-made or purchase the network frame, need to be stored in the same environment with the silk screen environment to prevent deformation, while the screen before the need to test the tension of the screen, and can use the photographic film to test the graphics.

     

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