Analysis of UV ink printing problems in packaging printing and corresponding solutionsfonmoo
In the printing process of doing packaging boxes, the ink time affects the quality of our packaging box printing, the quality of the ink often resolves the quality of the packaging box printing out, so we have to consider how to deal with the ink problems encountered in printing in the printing process.
A. Poor curing phenomenon
When the UV ink curing is not complete, the ink layer adhesion becomes poor, the printing process will form the printing ink layer back sticky in the back of the adjacent print, there will be a print sticky dirty; and the ink layer appearance is not resistant to friction, in the subsequent processing and the use of printed products are also easy to be scratched, which will seriously affect the quality of our packaging boxes.
Poor curing treatment methods:
We are dealing with the problem of incomplete curing of UV ink, the proven method is to switch to a faster curing UV ink; of course, we can also switch to a higher colour concentration of ink, to a thinner ink layer to complete the expected colour reproduction, by thinning the ink layer, to improve the ink curing power, so that the ink is completely cured.
In some cases we can also choose not to replace the ink, can add the right amount of exterior slip additives or the right amount of curing additives to improve the curing power of UV ink, complete the complete curing of the ink layer. It is worth reminding that we generally do not advocate the practice of participating in additives, as this is prone to chemical reactions.
Second, poor ink adhesion phenomenon
In the packaging printing printing ink layer adhesion is not all ink itself, it and the color with the appearance of the substrate material function is also closely related. When we encounter replacement or conditioning ink can not deal with the problem, and can not replace the substrate material, then we can do?
Ink adhesion poor treatment methods:
1, before we print the colour ink, we can first use the printing method to coat a layer of outstanding transparency, excellent adhesion media, improve the appearance of the substrate material function, so that the UV ink can be well attached.
2, in the printing of the substrate before the appearance of the material coated with water-based varnish priming, to deal with the burst ink, burst edge and other ink layer adhesion problems. Water-based varnish to roller coating method, and the choice of infrared drying.
Three, ink pile phenomenon
What is the meaning of printing pile ink? We often say that the printing pile of ink refers to the printing ink piled up on the blanket, printing plate and ink rollers, ink transfer transfer bad, and make the printed image on the print becomes more blurred. Heap of ink, dry roller problems occur mainly because: poor ink flow, poor ink transfer, paper powder flaking mixed into the ink, ink fineness is not, if offset printing, there may be ink emulsified by the fountain solution.
Heap of ink treatment methods:
To deal with the problem of ink pile, we can use the ink transfer oil or remove the viscous agent to adjust the viscosity of the ink and viscosity. If we choose the printing method is offset printing, then you can switch to a good water-resistant ink, it is important to note that the printing production process should not be too much water.
Generally speaking, the faster the curing speed of UV ink, the higher the hardness of the printing ink layer appearance, the lower the flexibility, the poorer the adhesion on the surface of the substrate, the lower the gloss of the print will be. Printing enterprises in the selection and use of UV ink, to consider comprehensively, dialectical trade-offs, encounter printing problems, more specific analysis of the specific situation.