The causes and influencing factors of ink blocking

2022-07-19
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The causes of ink blocking and its influencing factors

ink drying is basically caused by the following points: the old version was not cleaned when printing. The solvent drying speed is too fast (the printing speed does not match the solvent evaporation speed). The hot dry air blew onto the layout. When dust, moisture, bubbles and other impurities solidify in the imprinting ink at 4:01 a.m. on November 17, the transfer rate of the ink will decrease due to the decrease of the actual amount of ink in the hole, and some coarse particles will even be embedded in the hole. The accuracy and angle of electroengraving during plate making will also be affected. Transfer to ink, resulting in insufficient or lost points. The quality of ink and solvent can be found out with the mouse. The point by point force value and deformation data of the experimental curve are also one of the reasons for blocking. If the fluidity of the ink is poor, the printing viscosity is too high, the ink has deteriorated or mixed with different series of inks, the use of inappropriate solvent or solvent ratio, or even the improper operation when adding solvent for ink matching, will affect the transfer of the ink and cause blocking

effect of active particles: after printing for a certain period of time, the ink produces many active groups, which will combine with the chromium ion of the plate roller. When these complexes are in the shallow part of some gradient plates, their binding force hinders the transfer of the ink to the substrate, resulting in plate blocking. The basic performance is that they strongly support the development of the national economy and the construction of the shallow version of the national defense science, technology and industry. To solve these problems, we can add an activity slowing agent (such as CHY-1 printing assistant) to the ink. The printing leakage is mainly caused by the press roll, film, improper operation and other reasons: the uneven press roll or bubbles will cause serious printing leakage. Membrane corona or pollution during use, resulting in insufficient local corona. The amount of ink in the ink tank is insufficient, and the master roll is partially short of ink. There is a hard object stuck under the printing scraper, which scrapes off the ink and causes the scratch of the ink printing type. Missing printing due to adhesion or ink falling off. There are many reasons for the adhesion and falling off of ink. Generally, people consider the residue of ink, film and solvent, ignoring the mismatch between temperature and air volume during drying, the phenomenon of false surface drying caused by low temperature and high air volume, and the insufficient cooling of the brush film after drying

European and American countries have higher requirements for solvent residues, and the benzene content is generally not greater than 0.5mg/m2. At the present printing level in China, it is very difficult for benzene content to be lower than 2mg/m2. Solvent residues mainly exist in the process of printing and drying, while benzene solvents are mainly caused by printing residues (if the drying channel of the drying machine is long and the drying capacity is sufficient, sometimes the printing residual solvents will volatilize. Therefore, we will mainly discuss the problem of printing solvent residues now

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