Question: Printing has white spots
Reason 1: Printing has white spots
Improvement measures: The diluent does not match the matching diluent [Please use the company's matching thinner]
Reason 2: The sealing tape is dissolved
Improvement measures: use white paper to seal the net
Question: Sticky film
Reason 1: The ink is not baked dry
Improvement measures: check the degree of ink drying
Reason 2: The vacuum is too strong
Improvement measures: check the vacuum system (without gas guides)
Problem: Poor exposure
Reason 1: Poor vacuum
Improvement measures: check the vacuum system
Reason 2: The exposure energy is not suitable
Improvement measures: adjust the appropriate exposure energy
Cause 3: The exposure machine temperature is too high
Improvements: Check the exposure machine temperature (less than 26 ° C)
Problem: Ink does not dry
Reason 1: The oven is not well exhausted
Improvement measures: check the air condition of the oven
Reason 2: The oven temperature is not enough
Improvement measures: determine whether the actual temperature of the oven reaches the required temperature of the product.
Reason 3: Less diluent
Improvement measures: increase the diluent and fully dilute
Reason 4: The diluent is too slow to dry
Improvement measures: use matching diluent [please use company matching thinner]
Reason 5: The ink is too thick
Improvement measures: adjust the ink thickness appropriately
Problem: development is not clean
Reason 1: The placement time after printing is too long
Improvement measures: control the placement time within 24 hours
Cause 2: The ink is removed before development
Improvement measures: work in the darkroom before development (the fluorescent lamp is wrapped in yellow paper)
Reason 3: Developing drug is not enough
Improvement measures: insufficient temperature to check the concentration of the drug, temperature
Reason 4: The development time is too short
Improvement measures: extend development time
Reason 5: Exposure energy is too high
Improvement measures: adjust the exposure energy
Reason 6: Excessive ink baking
Improvement measures: adjust the baking parameters, can not be baked
Reason 7: Uneven ink mixing
Improvement measures: Stir the ink evenly before printing
Reason 8: The diluent does not match
Improvement measures: use matching diluent [please use company matching thinner]
Problem: Overexposure (etching)
Reason 1: The concentration of the syrup is too high and the temperature is too high
Improvement measures: reduce the concentration of the syrup and the temperature of the syrup
Cause 2: The development time is too long
Improvement measures: shorten development time
Reason 3: Insufficient exposure energy
Improvement measures: increase exposure energy
Reason 4: The developing water pressure is too large
Improvement measures: reduce the development water pressure
Cause 5: Ink mixing is uneven
Improvement measures: Stir the ink evenly before printing
Reason 6: The ink is not dried
Improvement measures: adjust the baking parameters, see the question [ink does not dry]
Problem: Green Oil Bridge Broken Bridge
Reason 1: Insufficient exposure energy
Improvement measures: increase exposure energy
Reason 2: The board is not processed well.
Improvement measures: inspection process
Reason 3: Development and washing pressure are too high
Improvement measures: check development and washing pressure
Problem: Sparkling on tin
Reason 1: Overexposure
Improvement measures: improve the development parameters, see the problem [overexposure]
Reason 2: The pre-treatment of the board is not good, the surface is oily. Dust
Improvement measures: pre-treatment of the board to keep the surface clean
Reason 3: Insufficient exposure energy
Improvement measures: check the exposure energy to meet the ink requirements
Cause 4: Flux abnormality
Improvement measures: adjust the flux
Reason 5: Insufficient post-baking
Improvement measures: inspection and post-baking process
Problem: bad tin
Reason 1: The development is not clean
Improvement measures: to improve the development of several factors
Reason 2: Post-baking solvent contamination
Improvement measures: increase the oven exhaust or spray the machine before the machine cleaning
Problem: post-baking oil
Reason 1: No segment baking
Improvement measures: segmented baking
Reason 2: The plug hole ink viscosity is not enough
Improvement measures: Adjust the viscosity of the plug hole ink
Problem: Ink matte
Reason 1: The diluent does not match
Improvement measures: use matching diluent [please use company matching thinner]
Reason 2: Low exposure energy
Improvement measures: increase exposure energy
Reason 3: Overexposure
Improvement measures: improve the development parameters, see the problem [overexposure]
Problem: ink discoloration
Reason 1: The ink thickness is not enough
Improvement measures: increase ink thickness
Reason 2: Substrate oxidation
Improvement measures: inspection pre-treatment process
Reason 3: The post-baking temperature is too high
Improvement measures: time is too long, check the post-baking parameters
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Problem: ink adhesion is not strong
Cause 1: The ink model selection is not suitable.
Improvements: Switch to the appropriate ink.
Cause 2: The ink model selection is not suitable.
Improvements: Switch to the appropriate ink.
Cause 3: The drying time, temperature is incorrect, and the amount of exhaust air during drying is too small.
Improvement measures: use the correct temperature and time, increase the amount of exhaust air.
Reason 4: The amount of additive is not appropriate or correct.
Improvements: Adjust the dosage or switch to other additives.
Cause 5: The humidity is too large.
Improvement measures: Improve air dryness.
Problem: blocking the net
Cause 1: Drying too fast.
Improvement measures: Add slow drying agent.
Cause 2: The printing speed is too slow.
Improvement measures: increase the speed and slow down the dry agent.
Cause 3: The viscosity of the ink is too high.
Improvement measures: Add ink lubricant or extra slow drying agent.
Reason 4: The diluent is not suitable.
Improvements: Use the specified diluent.
Problem: penetration, blurring
Cause 1: The viscosity of the ink is too low.
Improvement measures: increase the concentration without adding thinner.
Cause 2: The screen printing pressure is too large.
Improvement measures: reduce stress.
Cause 3: Poor squeegee.
Improvements: Replace or change the angle of the squeegee screen.
Cause 4: The distance between the stencil and the printed surface is too large or too small.
Improvement measures: adjust the spacing.
Cause 5: The tension of the screen printing net becomes small.
Improvements: Re-create a new screen.
Mietubl Global Supply Chain (Guangzhou) Co., Ltd. , https://www.mietublmachine.com