Best Sheetfed UV Printing 14: Cleaner
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Different inks require different cleaning solvents. Cleaning agents and chemicals for rollers, blankets and glazing plates require:
‧ Chemically compatible
‧ Environmentally and toxic standards
‧ Effective cleaning
A traditionally printed mineral oil based cleaner, but the removal of UV ink requires a polar solvent (glycol ether). For mixed mode applications, there are other combinations of cleaners (for UV and conventional inks) - it is also possible to use two separate systems, one for UV and one for conventional cleaners. Non-classical UV (mixed) requires a specific cleaning agent.
1 Use only tested and approved cleaning agents
2 Ensure that the correct cleaning agent is used in the ink system (eg traditional ink, UV ink, UV mixed ink)
3 Where there is doubt in the compatibility check before use
For all printing applications, the most important is to use only cleaning agents that have been reviewed by the printer manufacturer; approved and Fogra-qualified cleaning agents for various sheetfed presses. Fogra tested the compatibility of cleaning agents with rubber rollers, blankets, cleaning devices and other parts of the press. These products are listed at <http://www.fogra.org/>.
Depending on the combination of materials used (printing, ink, blanket and roll coating), cleaning system (brush or cleaning cloth) and the type of cleaning agent, it is also important to choose the correct cleaning procedure and cycle time.
Printers who use a standard four-color ink set with few changes often find that a combination process is sufficient for a cleaning agent. However, for a wide range of inks and often changing conditions, some printers have two containers - one is a blanket cleaner and the other is a roller cleaner. These two additional containers are useful in a half-to-half combination process that separates the UV from the conventional blanket and roller cleaning solution.
Comparison of cleaner efficiency
From the comparative test of the cleaning agent efficiency, it can be seen that the cleaning agent of the oily ink has an excellent effect, and the effect on the classic UV ink is also satisfactory. Testing non-classical UV (mixed) cleaners can only achieve poor to just satisfactory results - however, cleaners being developed for these inks will improve performance.
Expansion experiment
This simple experience shows that aggressive cleaning agents can swell the rubber compound. Three rubber samples were immersed in the three cleaning agents, and the sharpness increased from left to right. After 10 hours of soaking time, the sample in the right test tube swelled very much, while the left side remained almost unchanged.
The test results are summarized as follows:
‧ Traditional Ink: A cleaning device is usually used to clean the most commonly used cleaning agent to achieve good results.
‧ Classic UV ink: It can be cleaned quickly and effectively with proper UV cleaning agent; UV ink can be cleaned with a cleaning device with a cleaning device, and only one cleaning can get good results.
‧ Non-classical UV (mixed) inks: Traditional cleaners or classic UV ink cleaners are not suitable for removing these inks from blankets or rollers. There are also special cleaning agents for mixed UV inks, most of which are based on vegetable oils and have a high flash point.