Various offset printing ink index affecting printing effect 

Ink in the printing has a pivotal position and printed in the color and beautiful effect can have a variety of colors of ink to reflect the. However, various index of the ink itself but has deeply influenced the printing effect, below is a brief description and influenced the result of printing ink. 

1 the effect of ink activity 

In the process of printing ink, a certain amount of active agent is added. A printing plate cylinder chrome also have certain activity, if the activity of ink and a printing plate cylinder is too high, at the time of printing, active substances will firmly adhesion in the roller, scraping knife is also very difficult to the clean shaven, thus forming knife line. At this time, the printing plate cylinder is cleaned, and the active material is removed, and the active agent is added to the ink to eliminate the cutter line. An American store supplies all kinds of professional ink. 

2 the influence of ink quality 

Ink storage time is too long, the solvent balance changes, causing the ink to reduce the dissolution of the force, or ink deployment, improper use, causing chemical reactions, will make the ink. In the printing process, ink deposits easy to accumulate in the scraping knife blade caused by the need to replace the ink line. 

3 the effect of ink drying 

Ink drying too quickly, is easy to appear the phenomenon in the crust, if crust in ink circulation process is not dissolved, once exposed to scraping ink knife will adhesion at the bottom of the blade or knife, knife line of printed matter. If the ink circulation system uses the open channel, it is more likely to occur the phenomenon of ink crust and agglomeration. In order to reduce the probability of the occurrence of such kind of knife - line fault, and often stirring ink in the ink tank; adding proper amount of slow drying agent according to the need; if the conditions, added with a seal cover, can effectively control and reduce the printing knife line fault. 

4 the influence of ink viscosity 

Ink viscosity should match with the printing speed and high speed printing, ink viscosity control in 12 to 15 seconds (3# Zahn cup); printing speed, ink viscosity should be controlled in 16 seconds (3# Zahn cup) between. Ink viscosity is too high, the printing plate cylinder adhesion is too strong, is not conducive to scraping the ink scraping knife will be the layout of excess ink scraping clean, printing products appear to have a high probability of knife line. Printing process to measure and control the timing of the ink viscosity, a general measure of 20~30 minutes. 

5 the influence of ink fineness 

Gravure printing ink is mainly composed of pigments, binders, additives and other ingredients. If the pigment grinding is not sufficient, coarse particles and insoluble in binders and solvent, printing stay in scraping knife edge, it will lead to print the emergence of small, irregular knife line. Pigment particle fineness cutter line frequency has a direct impact, such as used in blue ink pigment particle hardness is high, even after full grinding is also very difficult to achieve a very fine particles degree, in the printing process is easy to damage the scraping knife or impact scraping ink effect, blue ink printing often appear knife line fault.