Ink blot drying slow phenomenon and its treatment

The prints left on the printed matter of the printing company are formed by the ink. The ink is the colorant used for printing and is the main raw material for printing. The ink is of great importance to the quality of the printing. When the ink properties are not suitable for printing, it will cause the process. A series of failures have seriously affected the progress of production and the quality of products. Collective.com reminds print operators of the need to change certain properties of the ink to suit printing needs. However, some malfunctions are caused not only by the ink, but also by other factors, so the print operator must carefully analyze the correct handling. This article discusses the failures caused by the ink printing process and the treatment methods, hoping to be helpful.

Slow drying of blots and their causes

After the imprint is transferred from the printing plate to the paper through the blanket, it is generally required to be dried in about 10 hours to facilitate the post-color printing or finished product inspection. Once the imprinting has dried slowly, this not only prevents the next color from being overprinted, but also Easily make the back of the print dirty. The dryness of the blot has three factors: oxidized conjunctiva, paper absorption, and moisture evaporation. We must master the operation and prevent it in advance. The common causes of slow-drying are the following:

(1) The paper PH value is below 6;

(2) The PH value of the bucket is less than 3;

(3) The layout of water is large and the ink is too large to cause serious ink emulsification;

(4) The workshop temperature is low and the relative humidity is higher than 75%;

(5) Poor absorption of paper;

(6) Ink is mixed with auxiliary materials such as varnish, detackifier, etc.;

(7) The amount of dry oil is too small.

Approach:

(1) In order to prevent the print from appearing slow-drying, the height of the printed matter should be reduced, fluffing loose paper piles, and the air penetration of the semi-finished product can allow air to infiltrate the stacked paper, shortening the time for oxidation and film formation;

(2) If the printing is urgently needed, use the original printing plate for dry oil overprinting. The formula is 70% for VERI oil and 30% for dry oil;

(3) In order to prevent unfavorable drying, add appropriate amounts of dry oil, dry oil consumption: winter more than summer, after the color than the previous one more place, dilute the ink more than did not dilute the ink more.