Sensitive circuit ink

First, operating environment: the selection of printing and exposure environment has a direct impact on the acquisition of fine lines, should be as slow down as possible to reduce the dust and foreign matter pollution in the printing room and exposure area. To achieve a high resolution of less than 100um, the environment requires at least 100000 level of purification chamber.

Two, pretreatment: in order to ensure the clean surface of the board no pollution, no grease and oxide, according to the degree of pollution on the surface of the board to choose brush, grinding brush or micro erosion and other processing methods. Suzhou silk screen printing ink

Water film rupture test can check the cleanliness of the board. The shorter the stay time after the surface treatment, the better to prevent the surface from oxidation or contamination.

Three, dilution: ink after adjusting the viscosity, add a small amount of diluent (no more than 2%), can improve the printing effect in automatic printing. Note: Stir thoroughly for 10 minutes before using, then let stand for 15 minutes to remove bubbles.

Four, printing: with 77-120t /CM polyester mesh, forming a film thickness of 8-10 microns, scraping Angle of 10-15 degrees.

Five, pre-drying: the temperature and time can be adjusted according to the specific production process, generally 25-35 minutes, 85-90 degrees.

6. Exposure: before exposure, ensure that the film and exposure table are clean and dust-free. In order to reduce pollution caused by production, clean the film surface with sticky dust wheel; The photosensitive spectral region is 310-420nm, the exposure energy is 150-200MJ /cm2, and the optical order is 6-8

Seven, development: 1% sodium carbonate spray, temperature 30-40 degrees, pressure 15-25psi, development time 40-50 seconds.

Eight, membrane removal: 5% sodium hydroxide or potassium hydroxide solution.

Nine, storage: the temperature at 20-20 degrees, away from light, away from heat.