What kind of printing material determines good printing UV offset printing

For the production of UV offset printing, after understanding the necessary configuration of the offset press, let us look at the requirements for printing materials.

1. UV inks UV inks are light-curable, absorbing inks. Since many cards require laminating, their performance is particularly important. There are two key points: First, the need for high temperature, high pressure, in the laminator high temperature, high pressure does not change color, do not fade; Second, the bonding force with the plastic film to be large, the minimum standard required to reach 6N tension. In addition, the choice of UV ink for card printing is also quite critical, in addition to ensuring the quality of the ink itself, it must also match the wavelength of the printer's UV lamp. Since many manufacturers use color inkjet drafts as the original for printing, it is recommended to choose the standard hue of yellow and magenta when choosing the ink. Blue ink. In addition, when spot color inks are formulated, inks with low viscosity and good fluidity should be selected as far as possible. The European Ark ink is preferred.

2. Special printing plate UV offset special printing plate wear-resisting, printing-resistant, no need to protect the glue when the machine stops, the old version can be used again, and is very suitable for the transfer of UV ink, high reduction rate when printing, can basically reach 2 % of the outlets are not lost and 98% of the outlets are distinguishable. At present, Japan Fuji UV version is of good quality, taking into account the cost of printing, for small batches of short-lived, text version can be properly used ordinary version, but the film is easy to wear, printing should pay more attention.

3. Blanket and lining In order to ensure the best transferability and dot reproducibility of UV ink, it is best to use air-cushion blanket because of its good acid and oil resistance. Hydrophobicity and good ink transfer performance can ensure that the dot deformation during the printing process is minimal, the printed graphic is clear, the reproducibility of the high-profile part is good, and the plate wear is small.
Eraser roller liner lining is better than neutral hard, because the surface of PVC and other sheets is rough, which can easily lead to high printing dot gain, and the use of neutral hard liner can make the dot clear, smooth and reproducible. The geometric shape of the graph changes little, and the increment of the width of the graphic and printed sheets is relatively small.

4. PVC sheet, etc. PVC and other sheet materials have bright and matt surface. The light surface is smooth and the matt surface is rough. It is very important to choose the printing surface, which can avoid many printing quality problems. Generally, the matt surface of the sheet such as PVC is used as the printing surface to ensure that the actual ink printing does not pull the hair, the network points are firm, the adhesion between the ink and the material is strong, and the ink is full and does not expose the small white spots. In addition, the printing pressure is appropriately increased by 0.02 to 0.05 mm from the standard pressure.

5. Auxiliary materials: Car wash water and blanket cleaning agent used in UV offset printing. Cleaning solution, etc. are best to use special products, which for UV ink roller. The life and performance of UV blankets and UV plates are particularly important. Although the cost will be higher, it can be flexibly applied according to the actual situation. Ensure that the ink roller is cleaned once a week; use a special revert agent to clean the blanket when it is stopped, so that it can not only ensure the elasticity of the blanket, but also ensure the color balance and avoid color aberration when restarting.

Source: PACK.CN