Intaglio printing inks are relatively thin. In storage, the solids in them are always subject to sinking due to gravity. Therefore, the mixing of the ink in the packaging should not be neglected before use. The ink that is poured from the unstirred ink layer may have low viscosity, poor color density and hiding power. The viscosity of the ink removed from the unstirred lower layer may be greater, and the ratio of the pigment to the film forming material may be higher. As a result, the adhesion will be poor, so before use, use a clean stick or a metal rod to whisk it evenly. Generally, it is necessary to agitate the ink for at least 3 to 5 minutes. If the ink is stored longer, more agitation is required.
Second, in the use of ink, it is necessary to pay attention to the sealing of the ink tank and prevent the mixing of impurities. Since these inks are volatile and involve scraper and dot problems, it is necessary to prevent dry agglomerates and to prevent volatilization during storage. The above problem should be completely removed to dry the ink particles and debris, in order to maintain the original state of the ink.
In general, the printing problem is nothing more than three reasons: the first is the ink problem; the second is the condition of the printing press and the printing object; and the third is the skill of the operator. All three reasons can be the main factor in the success or failure of a print job. Therefore, when the problem occurs, it is necessary to conduct a more detailed analysis of the three, to clarify the cause of the failure, and to take countermeasures. The following lists common faults and their countermeasures.
1. paste version
Phenomenon: Small prints or patterns cannot be printed. In severe cases, a layer of ink can be seen.
Reason: The ink is too dry, which causes the ink to settle in the pocket; the speed is slow, and the printing plate is not good.
Treatment method: In the ink can be adjusted into the appropriate solvent boiling point 120 ~ 150 °C slow dry; appropriate increase speed; re-plate.