What is flexo printing with uv ink?

author: Uvink

2022-12-22

What is flexo printing with uv ink?Flexographic printing is a printing process that

has developed rapidly in recent years. The image and text part of the printing plate is

higher than the non image and text part, and has flexibility, which can better express

the subtle level and contour of the image and text part. In addition, it applies to a wide

range of printing materials. In addition to traditional paper, some non absorbable printing

materials, such as plastic film, aluminum foil composite paper, cellophane, can also be

printed by flexography.When using UV ink for flexographic printing, in addition to

the problems of coloring, curing and adhesion,attention must also be paid to the influence

of ink components on the viscosity and rheology of the ink,so as to obtain better

printability and stability.

What is flexo printing with uv ink?The flexographic printing process determines that

the UV ink used should not have a high viscosity. Traditional flexographic printing inks are

solvent based and water-based. A large amount of solvent or water is needed to adjust

the viscosity. Because a large amount of solvent is used, most flexographic printing inks

are similar to Newtonian fluid in rheological properties, which will lead to ink sedimentation

and instability. Therefore, appropriate thixotropy of flexographic printing inks can prevent

pigment flocculation and sedimentation.

What is flexo printing with uv ink?UV flexographic printing ink uses active thinner to

reduce the viscosity of the system, so its viscosity may be higher than that of solvent

based flexographic printing ink on the whole. Although the viscosity of UV flexographic

printing ink is lower than that of screen printing and offset printing ink, the addition of

pigments will improve the viscosity, especially when the wetting, dispersion and stability of

pigments are not well handled. In addition, pigments play a more important role in the rheology of ink,

and appropriate thixotropy is beneficial. This is because when the molecular cross-linking inside the ink

reaches a certain degree and pseudoplasticity occurs, the viscosity of the ink system without pigment

dispersion stabilizer will drop sharply on the high-speed ink roller, but when it leaves the ink roller and

enters the printing part with relatively low speed, the viscosity will rise rapidly, and the wetting effect on

the substrate surface is too poor, Not suitable for printing. The ink containing appropriate dispersion

stabilizer has a certain stability, and its viscosity is not high. After high shearing, the viscosity

rises slowly, and the printing adaptability is good.