PCB Screen Printing Screen Production Process: Net Drying

Net Drying

Washing the net: Use grinder paste to remove grease (new net), ghost paste to remove graphics (old net), remove pulp powder to net pulp and blue oil, wash debris with anti-white water, rinse the net with detergent, and finally use high pressure rinse the water gun, and finally clean it with pure water.

Grilling net: oven setting temperature should be less than 48.

Premium film: clean the net and clean it with pure water again. Increase the size of the project film by 20% and select the water film. Use a triangular ruler to press one end of the water film on the net, and then use the triangular ruler to slowly scrape it up, and then use a squeegee to gently press and wipe off the excess water. Portion drying

Premium film: Clean the net and clean it with pure water again. Increase the size of the project film by 20% and select the water film. Use a triangular ruler to press one end of the water film on the net, and then use the triangular ruler to slowly scrape it up, and then use a squeegee to gently press and wipe off the excess water.

Use mesh pulp: Dry the mesh plate and then sizing, use a scraping box, and scrape the box containing the mesh pulp onto the net, where the green oil is three times, (about once every 10 minutes or more) the base oil, the surface oil is second, and the blue gum first tear off the film with 50K water film, and then apply 20 mesh pulp, scraping three times each time (we have adopted an automatic sizing machine), and dry after the sizing is completed.

The selection of mesh yarn is a general circuit, green oil, base oil, surface oil with 120T, 100T, 110T mesh, carbon oil 51T, blue glue 24T photosensitive circuit, and thermosetting green oil 77T.

The film selection line uses 18K water film (no mesh pulp is used because the mesh pulp is not used due to unevenness), green oil, base oil, and surface oil use mesh slurry, and carbon oil uses 50K water film.

Paste the required engineering graphic film on the selected position of the screen, place it on the exploding machine for exploding, the time is selected (3000W spotlight), the line is generally 60-80 seconds, the green oil is 80-100 seconds, and the bottom character oil is 40— 60 seconds, carbon oil, blue gum 350-400 seconds.

Rinse the net with pressurized water and dry it.

Seal the outer edge of the graphic film with blue oil (sealing paste) and dry it.

Check, repair the net, write down the completion date and each corresponding number, and record and save it.

Of course, this is just a general operation step. If the actual operation strictly follows this method, it is extremely unwise. We should learn and apply to PCB so that we can continue to improve and make better products.