UV ink for printing equipment and printing equipment requirements

Replaced by an ordinary printing ink UV ink printing, the need to do the following preparations.

1, drying equipment

Different types of ink have different drying characteristics of UV inks to fully dry, the need to use with the ink of the UV light source to match. Have used high-pressure mercury UV light source, non-ozone lamps, metal halide three kinds of output power for 80W/cm, 120W/cm and 160W/cm. Lamp cooling means cooling and water cooling ventilation. Drying installation into the sub-type (GM-type printing press, non-modified type) and a conveyor belt installation.

Choice when the UV light source, based on UV inks and UV Varnish drying conditions, but also compare the efficiency of UV light irradiation. UV light irradiation of a variety of different efficiency.

UV printing ink: metal halide> high-pressure mercury lamps> without ozone lamp; UV Coating: High-pressure mercury lamps> metal halide> ozone lamps no.

UV lamp to choose when they take into account other factors, such as the use of high-pressure mercury, because high voltage can not be replaced by metal halide lamp. Metal halogen lamps can be replaced by high-pressure mercury lamp with or without ozone. From this point of consideration, that the use of metal halide.

80W/cm compared with the light, 120W/cm radiation efficiency of the former 2 times 160W/cm is 2.5 times the 80W/cm. Under normal circumstances, the use of ventilation cooling 120W/cm; water used in cooling 160W/cm.

From the cooling effect, the ventilation cooling better than water-cooled, water-cooled jacket of the curing efficiency due to the impact of ventilation cooling than the 20% to 25%. Oil in particular, UV printing, the short-wave ultraviolet light was blocked jacket, resulting in slow drying printed products. In addition the high cost of cooling water, ventilation and cooling tube life expectancy is only 50% ~ 70%, operating when the odor is also larger, so unfit for use.

Dry ink absorption of UV light, direct light source from 30%, 70% from the launch of sounding board. Is now more reflective aluminum panels, due to different processing technologies, the reflectivity of reflective panels vary greatly, and therefore detection of UV light energy, not only to detect light, we must also include the reflected light measurement, including all the purple amount of light outside. Special materials such as printing (PET film, PP film, synthetic paper, etc.) needs to be cold sounding board, only the UV reflectance of infrared transmission, the decline in print surface temperature 10 ℃.

Integrated on, we can see that the ventilation cooling in the curing aspects of efficiency and economy better than water cooling. Installation of UV lights the way to the use of printing presses and into the ultra-violet light after the manner of good. Conveyor belt due to the impact of paper neat way, with the exception of special purpose non-use of the general, while the length of tube to be longer than the printed materials 10 ~ 20cm, otherwise it will create bad print at both ends of the drying.

2, the installation of an example - the installation of four-color machine UV dryer

In order to achieve 8000 ~ 10,000 / hour print speed, from the UV ink and UV Varnish to consider, after the unit is installed in the ventilation or cooling 120W/cm metal halogen 160W/cm best fitted to 4, 5 can also be installed. If only Indian to reach the highest speed 8000 / h, not very high requirements on the dry, the three tubes can be installed. If you want to take into account UV Ink, UV Varnish drying effect, it can be taken to metal halide and high pressure mercury and methodology used.

3, the preparation of printing equipment

① roller replacement

Roller needs to be replaced by special UV ink roller. Even special UV ink roller, due to different materials in the machine by sticky situation there is a difference, so the choice of rubber is also very important.

By the general choice of the smaller resin-based adhesive roller.

② Diao paper replacement teeth

Sheet-fed Offset Press equipment installed after the UV irradiation, Diao UV irradiation in the paper when the teeth it will cast a shadow, so that Indian goods can not be fully localized UV light irradiation. In order to avoid this phenomenon, the replacement should be suitable for printing UV printing paper Diao teeth.

③ PS version

UV inks in addition to PS-specific version of Yang plans, the other yang graphics version PS version, if not dealt with grilled, lower resistance and India, therefore, need to deal with grilled version, baked version of condition is 250 ℃, 6 ~ 8 minutes.

④ Solution

UV ink is not the exclusive use of Fountain Solution, UV ink printed version should be run to avoid excessive fluid plus gum arabic, gum arabic and because UV ink reaction, resulting in ink heap version of the fault blanket reactor.

⑤ substrates

UV ink on the substrate in some poor adhesion, printing, when attention should be paid to the use of the substrate suitable for printing with UV inks.