In the process of printing composite packaging bags , the uniform flat screen on the printing plate cannot be leveled due to the ink, and the dots appear alone, forming a filter shape, and even dots are missing.
cause:
â‘ Ink viscosity or yield value is too high, resulting in poor ink transferability.
â‘¡ The ink dries too fast, and is not evenly distributed on the printing plate, it is dried and cured too early.
â‘¢ The wettability between the ink and the printing plate is poor (the surface tension does not match), and the transferred ink is not easy to spread.
â‘£The pressure of the doctor blade is large, but the pressure of the printing rubber roller is insufficient.
⑤ The printing plate network cable is too thick, the interval between the mesh holes is large, and the ink is not easy to spread.
solution:
â‘ Reducing the viscosity of the ink and improving the transferability of the ink, it is recommended to use 20 # additive for gravure ink .
â‘¡Adjust the position of the doctor blade holder to shorten the distance between the doctor blade and the plate cylinder.
â‘¢Use slow-drying solvents to reduce the ink drying speed and increase the dot increase rate.
â‘£Adjust the scraper pressure and printing rubber roller pressure.
⑤ Re-making the plate to change the shape and angle of the net hole.
â‘¥ Use low viscosity ink instead.
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