UV flatbed printer is a common printing equipment in the advertising processing field. Its principle is to cure and adhere uv ink to the surface of the medium through through ultraviolet light. Therefore, ensuring the adhesion of the ink layer between the ink and the medium after printing is an important technical requirement for UV flatbed printers. So when problems such as insufficient adhesion and peeling of the ink layer occur, which aspects should be addressed?

Before finding a solution to improve the adhesion of UV inks, we need to understand what happens due to poor adhesion. When UV flatbed printers are working, we have encountered some media that have unsatisfactory adhesion, such as the appearance of ink layer integrity. Pieces fall off, the one-hundred grid test fails and the ink is removed by hand. Poor ink adhesion has a great influence on the graphics and text effects. The adhesion cannot meet the requirements and the key functions such as accuracy, speed, and weather resistance cannot be achieved. UV flatbed printers lose their market significance.

The method to improve the adhesion of UV flatbed printers can be considered from the following aspects. The first thing is to directly adjust the ink formula, select oligomers and reactive diluents with small volume shrinkage to reduce the internal content generated during the photocuring process. Stress and the formation of swelling, penetration and other effects on the substrate. To enhance the adhesion effect of the UV flatbed printer, the second is to add a tackifier to the UV ink, but the addition amount and environmental issues must be controlled. Then there is the pre-treatment cleaning process specification of the media printing surface and the construction specification of inkjet printing. Then there is the medium itself. The medium is also divided into polar and non-polar. For the medium with low surface tension and difficult to adhere, it can be processed by chemical, corona treatment, or the current mainstream special coating pretreatment before printing.

Among the many ways to improve the adhesion of UV flatbed printers, we can see that the change of the medium is generally not realistic or will damage the surface of the medium. It does not necessarily mean that the adhesion problem can be improved after changing the surface properties of the medium. , Cleaning and other tasks can be done. However, the current mainstream pre-press coating solutions have health and environmental concerns for certain special industries, such as toxicity and corrosiveness. Therefore, it is more sustainable to change the ink formula or add non-toxic and harmless tackifiers. However, this problem is exactly what all UV printer manufacturers, especially UV ink manufacturers, are constantly conquering and improving.