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Five steps to adjust ink viscosity with zero error
In the gravure printing process, the transfer of ink is extremely important, and the appropriate viscosity of the ink is crucial. If the viscosity is too high, it is not conducive for the ink to enter the mesh holes of the printing cylinder and fill them in a very short time, nor is it beneficial for the ink to transfer from the mesh holes to the film and quickly level out. If the viscosity is too low, the ink layer on the film after printing will be too thin, resulting in insufficient color saturation.
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The transfer of ink during the gravure printing process is extremely important, and the appropriate viscosity of the ink is crucial. If the viscosity is too high, it is not conducive for the ink to enter the mesh holes of the printing cylinder and fill them in a very short time, nor is it favorable for the ink to transfer from the mesh holes to the film and flow evenly. If the viscosity is too low, the ink layer on the film after printing will be too thin, resulting in insufficient color saturation.
Specific steps for adjusting ink viscosity:
Step 1: After preparing the ink, stir it thoroughly and evenly;
Step 2: Use a kettle to buffer the ink mixing solvent along the wall of the bucket while continuously stirring the ink;
Step 3: After adding a certain amount of solvent based on experience, use a No. 3 Zahn cup to test the ink viscosity (check if the stopwatch is working properly and if the viscosity cup is accurate before measuring viscosity);
Step 4: After the viscosity cup is filled with ink, lift it and start timing. The time measured until the ink leaks from the small hole and breaks the line is the viscosity;
Step 5: The measured viscosity value must meet the required viscosity range for the ink. If it is not within the range, it needs to be adjusted accordingly. After measuring the viscosity, the viscosity cup must be cleaned thoroughly.
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