Packaging box printing manufacturers often have a series of problems during the packaging box printing process, which affect the quality of the printed products of the packaging box. If the surface of the film is not corona treated, or the surface tension of the film is lower than the surface tension of the ink, the ink will It is not easy to adhere; when the unused ink does not match the characteristics of the film material or when the special ink is not used, such failures will also occur; and such failures will inevitably occur when using expired or invalid inks. In addition, the power of the drying device (UV or infrared hot air drying) is low, so that the ink cannot be completely dried or the printing ink layer is too thick, the amount of ink is too large, and the ink viscosity is too large. The ink will become brittle after drying for a long time, which will also cause the film. The ink layer on the surface has poor adhesion and ink drop easily. Ching Luen packaging manufacturers analyze the 4 major causes of ink dropout in packaging box printing:

1. Poor surface coating

The surface tension of film materials is low, and packaging and printing companies need to perform coating treatment before making packaging boxes. Poor coating will cause ink to be printed. It is usually manifested as a large area of ink peeling off, especially in the tape test, the surface ink will be stuck on a large area by the tape.

Solution: At this time, the raw material supplier needs to replace a batch of qualified materials, or the printing company prints a layer of primer to increase the surface tension, but it will increase the cost.

2. Poor matching of ink and material

The ink drop caused by this reason in packaging and printing companies usually manifests as flakes or sporadic.

Solution: Taking into account factors such as material cost and customer needs, the material cannot be replaced. You can find the ink that matches the material through the ink supplier. At the same time, some auxiliary measures can be taken, such as corona treatment of the material in advance.

3. Poor corona effect

The ink drop of the film material is related to the surface energy of the material. The stronger the surface energy, the stronger the ink adhesion, and vice versa. However, the corona effect will decay over time, and packaging printers may cause ink drop during printing.

Solution: This kind of phenomenon is mostly seen in the cheap BOPP and PE materials. Considering the high coating cost, most manufacturers will corona treatment on them. In this case, the manufacturer or supplier should perform the corona again before printing.

4. Poor UV drying

Most packaging materials are printed with UV inks, so if they are not completely dried, they will drop ink.

Solution: In this case, one or two colors are missing ink. Simply increase the power of the UV lamp or replace the UV lamp to solve the problem.

In the packaging printing process of packaging and printing manufacturers, it is easy to have the problem of ink loss in surface printing, which greatly affects the quality of the printed products. Therefore, to solve the problem of ink loss in printing during the printing process, the first key point is It is necessary to find out the cause of the label printing ink loss, and choose the correct solution according to the specific reason!