Many Jinan label printing companies have the same problems in printing. In the process of label printing of film materials, it is easy to have ink loss in surface printing, which greatly affects the quality of printed products and even delays the delivery date. This paper summarizes and enumerates the reasons and improvement skills of common ink loss from the resume of daily printing, so as to find out a better treatment plan.
Problem 1: coating defects
The general film is divided into two kinds: with coating and without coating, and the reason why the film coating defects lead to ink loss is also divided into two environments: as for the film material with coating, if the appearance of the coating is poor, it will lead to poor ink adhesion; as for the uncoated film material, due to the poor connection between the surface layer and the ink, it will lead to ink loss.
For ink loss caused by coating defects, it can be handled in the following ways: take varnish printing on the surface layer to protect the upper layer of the ink for the purpose of preventing ink loss; the surface layer receives corona re treatment, and the appearance corona dyne value of the material shall not be less than 38m M / m, and the dyne value less than 36mm / m will simply affect the printing ink fastness; the surface layer is applied with primer or ink The strength of the film surface layer can also be improved by adding a strong reinforcing agent (the mixing ratio is 3% swing); because the appearance coating of some sub surface synthetic paper materials has the characteristics of inevitable paper coating, it is not suitable to use 3M tape for inspection.
Question 2: Tension
As for the film material with corona treatment on the surface of printing, in order to achieve good ink wetting, the dyne value usually needs more than 38m M / m, and less than 36mm / m, which is prone to ink loss; at the same time, the dyne value of this material will gradually fade with time, resulting in ink loss. The essence of this problem is tension.
As for the ink drop caused by this kind of environment, there are several handling plans as follows: use the satellite wheel with online corona effect to start color, hold online corona treatment to improve the appearance of membrane materials; adopt the intermittent printing machine to conduct the appearance primer treatment to improve the appearance printing adhesion; when the cause value disappears, the corona treatment is required during printing, but the cause value is large Small does not completely represent the adhesion between the ink and the surface material. The fading cycle of the common dyne value is 3-6 months, so it is recommended to reduce the storage of the stock material forever.
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