One of the common faults of the conductive ink printed circuit board: air bubbles are generated on the surface of the screen printing ink. There are roughly five reasons:
1. The scraper printing speed is too fast and too dry. 2. The ink itself has bubbles or uneven viscosity. 3. The wire mesh is contaminated. 4. The surface of the substrate is dirty or oily. 5. The viscosity of the ink is too large. The improvement measures are also targeted at five points: 1. Adjust the scraper speed. 2. Stir well. 3. Clean the wire mesh. 4. Clean the surface of the substrate. 5. Adjust the viscosity.
Common faults of conductive ink printed circuit board two: the size of screen printing products is enlarged The reasons for this phenomenon are:
1. The viscosity of the ink is too low. 2. The ink has great fluidity. 3. The wire mesh tension is too low. 4. The pressure of the scraper is too high. 5. The exposure lines are jagged (dog teeth). There are five improvement measures provided: 1. Adjust ink viscosity. 2. Adjust the ink viscosity. 3. Replace the screen. 4. Reduce scraper pressure. 5. It is best to use water film.
Common faults of conductive ink printed circuit boards: the square resistance of carbon film is high.
1. The screen film thickness is too thin. 2. The number of meshes is too large. 3. The viscosity of the carbon slurry is too low. 4. The curing time is too short. 5. The curing temperature is too low. 6. The screen printing speed is too fast. 7. Do you use special boiling water for mixing with other chemicals? 8. The square resistance of ink is high. 9. Excessive addition of special thinner / oil water. 10. The ink has deteriorated or expired. The improvement measures provided are also targeted at ten points: 1. Increase the thickness of the omentum, scrape a few more photosensitive pastes or select high-number water film. 2. Reduce the number of selected meshes. 3. Increase the viscosity of the carbon slurry. 4. Extend the curing time. 5. Increase the curing temperature. 6. Reduce screen printing speed. 7. Do not mix with other chemicals, use special boiling water. 8. Choose low-power ink. 9. The special thinner should not exceed 5%. 10. Use new ink.
The fourth common faults of conductive ink printed circuit board: poor adhesion of conductive film. There are eight common causes of failure:
1. The surface of the board has not been cleaned before printing the ink (foggy water, copper skin oxidation, residual chemical etching solution). 2. Incomplete curing. 3. Being impacted during electrical inspection. 4. Impacted during punching. 5. Mix non-special diluent with other chemicals. 6. The conductive ink has expired. 7. The gold-plated and nickel-plated surfaces are too smooth. 8. The network distance is too large. There are eight corresponding measures for improvement: 1. Strengthen the cleaning and drying treatment of the board surface. 2. Adjust the curing time and temperature. 3. Adjust the pressure during electrical inspection. 4. Whether the mold is slotted in the upper mold. 5. Use special thinner. 6. Replace qualified conductive ink. 7. Electroplating must use dumb gold and matte nickel. If the surface is too smooth, open the brush and polish gently. 8. Reduce the net distance. [next]
The fifth common faults of conductive ink printed circuit board: there is no ink on the surface of the substrate (the ink leakage is uneven). There are eight common causes of failure:
1. The screen mesh is too high, and the ink permeability is poor. 2. The photosensitive film is too thick. 3. There are scratches on the blade edge. 4. The embossing force of the scraper is not enough, or the embossing force is uneven. 5. The gap between the screen printing plate and the substrate is too large. 6. The viscosity of the ink is too high and the penetration is low. 7. The ink returning to the scraper is not uniform. 8. The printing speed is too fast, making the ink supply uneven. 9. Too little ink on the screen. 10. The printing platform is uneven. 11. The surface of the substrate has water vapor or oil stains. The measures available for improvement are correspondingly eleven points: 1. Change the screen version and reduce the screen mesh number. 2. Improve the photosensitive film. 3. Grind the scraper blade until sharp. 4. Adjust the screen printing scraper strength. 5. Reduce the gap. 6. Adjust ink viscosity. 7. Adjust the oil return method. 8. Slow down the printing speed. 9. Add appropriate amount of ink. 10. Adjust the printing platform. 11. Cleaning, pre-processing machine again.
Six common faults of conductive ink printed circuit board: After printing, the ink bleeds, causing side shadows or ghost images, and blurry graphics. There are nine common causes of failure:
1. The edges and corners of the scraper blades are worn, and the effect of ink breakage during scraping is poor. 2. The scraping angle of the squeegee is too small, which results in too much ink supply. 3. The viscosity of the ink is too low and the thixotropy is poor. After printing, the ink spreads and seeps. 4. The ink and solvent are stirred unevenly, and the ink with much solvent will leak after printing. 5. After cleaning the screen printing plate, solvent remains. 6. The screen printing plate and substrate overprinting rules are misaligned. 7. Improper selection of ink and screen mesh, fineness of ink and too low screen mesh. 8. The screen printing pauses or repeats printing halfway. 9. When the ink is returned, the scraper is too hard. When not printing, a small amount of printing material has been extruded from the mesh. There are nine corresponding measures for improvement: 1. Grind the scraper blade to sharpness. 2. Adjust the scraper angle. 3. Adjust the viscosity. 4. Increase the mixing time. 5. Clean the stencil. 6. Fixed position. 7. Choose the correct screen. 8. It is best not to repeat printing. 9. Lightly scrape the wire mesh to prevent penetration.
Seven common faults of conductive ink printed circuit board: paste version (blocking network). There are seven common causes of failure:
1. The substrate is not smooth or low in strength, and powder and hair loss will cause paste. 2. The pigment and other solid particles in the ink are large, and it is easy to block the mesh during screen printing. 3. The temperature is high, the humidity is low, the solvent in the ink evaporates quickly, and the viscosity becomes high. It can cause network blockage; or the shutdown time is too long, it is also easy to cause network blockage; low temperature, poor ink fluidity, and easy to cause network blockage. 4. The silk-screen printing plate has been placed for a long time, it has not been cleaned before printing, and it has adhered to the dust, causing the network to be blocked. 5. Excessive pressure during scraping and large curvature of the scraper cause surface contact during scraping. Each time the scraping ink is not scraped off by the scraper, residual ink is left on the printing plate, which causes conjunctival after a certain period of time. Block the net. 6. The screen pitch is small, and the screen printing plate cannot be separated from the substrate after scratching. When the printing plate is lifted, ink adheres to the printing surface of the printing plate, which may easily cause network blockage. 7. There is a shadow in the pattern part during plate making. There are seven corresponding measures for improvement: 1. Cleaning the substrate. 2. Adjust the ink. 3. The printing environment is best to be a constant temperature and humidity ventilated air-conditioned room, slow down the dry water to adjust the viscosity. 4. Clean the stencil. 5. Adjust the pressure and regrind the scraper. 6. Adjust the pitch. 7. Use chemical products to remove turbidity.
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