UV curing technology for packaging box printing

UV curing technology for packaging box printing

In electrostatic copying, using magnetic nano color powder instead of widely used non-magnetic color powder can save ferromagnetic particles that are currently used as magnetic materials, and produce a single component copying developer, which can save raw materials and improve copying quality.

In recent years, ultraviolet (UV) curing technology has been playing an increasingly important role in printing. The most important advantage of UV curing is that it can improve printing stability (in terms of drying),

At present, UV technology has been widely used in the roll paper relief printing, flexographic printing, and offset printing markets to shorten the waiting time for oxidation drying during the printing process. Nowadays, a new type of cationic ink has emerged,

Compared with free radical systems, cationic ink has the advantages of low volatility and low odor, making it a better environmentally friendly ink for improving the environmental protection and quality of flexographic printing.

The odor of free radical ink is harmful to the health of operators and the environment, while the low volatility of cationic ink has great advantages in this regard, and its application in the food packaging industry has significant advantages.

Cationic ink also has the characteristic of being able to adhere to plastic substrates. Cationic ink and coated varnish exhibit particularly good adhesion to corona treated substrates, which is the most critical advantage compared to free radical ink,

The curing speed of cationic ink is moderate, which is slightly worse than that of free radical ink. It can be cured for a second time (about 24 hours), and has the characteristics of no inhibition of oxidation, slight humidity influence, no shrinkage, and excellent adhesion to plastic materials.

Although free radical inks can dry under high-speed printing, the curing speed of cationic inks is slightly slower. But recent studies have shown that improved cationic inks can also adjust printing speeds of 150-200mm/min.

The advantage of secondary curing is that when the printed material is output from the printing machine, the ink film appears to have cured, but there are still some parts inside the ink layer that have not been completely cured. Cation curing technology can continue to cause curing reactions.

In contrast, free radical ink can cause higher volatility during this process, especially for low molecular weight components that have not reacted and are more prone to volatilization.

Ions can only be completely dried by exposure to UV light, resulting in a small shrinkage and excellent adhesion properties.

UV curing technology for packaging box printing