Effect of Scraper in Printing on Ink Transfer Performance
In screen printing, another undesirable characteristic of the scraper is the tendency to approach the web frame, which results in inconsistent ink transfer properties. The concept of the wiping roll is feasible, 50% more than the traditional ink squeegee ink accumulation. Studies have shown that the force to rotate the wiper blade (rather than moving it with the screen movement) is the best way to reduce the impact of friction drag during ink transfer.
In fact, the wiper roll system achieves twice the dynamic pressure of conventional wipers and provides a highly supportable contact area and a very small bias that can be controlled. Such scraper can provide consistent contact throughout the image width during the printing process. The limitation of the wiping roller is that it must be independently driven to rotate, requiring a heavier structure than the traditional wiper blade, which also makes it harder to set, which is why the application of the flatbed press is limited.
Another problem that arises at the time of the argon roller prototype test is that the improved production rate requires that the chemical composition and drying technology of the ink be improved accordingly.
The squeegee roll system provides the press with the potential to be much higher than the current speed, so the ink must be improved in order to make the transmission more consistent and must be introduced into the curing equipment to allow the printed matter to dry effectively at high speeds. High-speed printing requires both the rapid transfer of ink, but also the development and speed to improve the quality requirements to match the ink. This is the natural development of existing ink technology, rather than to come up with new ink formulations.