How to adjust the ink viscosity and improve the printing effect?
When this problem with the general printing speed are closely linked, the printing speed is low, the ink viscosity need more and more small, if the speed and viscosity with good is prone to water. Usually, the printing speed is basically fixed, so is to solve the water by increasing the viscosity of ink. Another phenomenon and the water is very similar, if not carefully observed, it is easy to like water treatment analysis, with the increase of viscosity to solve, but the result didn't effect (or opposite effect), this is a lot of people will overlook. I've met many printers in person, and they all make mistakes. Water and this phenomenon (temporarily called the "flower") the difference is: water show is very short line form, and "flower" show is round spot. To solve the problem is to reduce the viscosity of the ink, if it is too serious, it may be a printing or ink quality problems, by reducing the viscosity, only to play a role in improving the effect.
Overprint badIncluding two cases: one refers to the color after the dissolution of the ink has been printed in front of the good color, making discoloration or produce tailing, re - shadow, at this time should be increased after the same color of ink viscosityAnother situation is that the color of the ink does not come to the same color as the ink, and at this time to adjust the viscosity of the smaller one color ink.Shallow printing network, smaller viscosity is beneficial to improve the ink transfer, avoid bad "white" phenomenon. From the above we can see that viscosity is closely related to many printing problems, and the adjustment of viscosity can solve many problems.
Scraping effectLarge viscosity, scraping effect is not good (refers to scratch), especially for black ink, generally use smaller viscosity to prevent scratching.
The small ink viscosity of the cutter line can prevent the appearance of the cutter line to the maximum extent, especially when the printing plate is printed, the printing lines have not been printed, or very small, and the printing time has become more and more serious. In another case, the knife lines appear in a reticulate position, and are at the starting point.
Hue small, ink viscosity, color lighter, and conversely, color darker. But can not blindly adjust viscosity to change the color, or will cause other problems, such as water, the color is not bright etc.. In color matching, we must master the different colors, viscosity changes in the bias, in order to better use of viscosity. Such as: yellow color, viscosity is large, there are biased red side, while viscosity hours will appear green; green viscosity, blue phase, viscosity, yellow phase.
