Analysis and solution to the cause of slow drying of ink blot after printing

Analysis and solution to the cause of slow drying of ink blot after printing

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Slow blotting

After the printing plate is transferred from the printing plate to the paper by the rubber cloth, it is generally required to be dried in about 10 hours to facilitate the printing of the back color or the inspection of the finished product. Once the printing is slow, the next color cannot be overprinted, and It is easy to make the back of the print dirty. The drying of the blot has three factors: oxidized conjunctiva, paper absorption, and water evaporation. We must correctly control the operation and prevent it in advance.

Common reasons for slow drying

(1) The paper has a PH value of 6 or less.

(2) The water bucket has a pH value of 3 or less.

(3) The layout of the water is large, and the ink is very emulsified by the ink.

(4) The workshop temperature is low. Relative humidity is above 75%.

(5) Paper absorbability is poor.

(6) There are too many auxiliary materials such as varnish and debonding agent in the ink.

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

Approach

(1) In order to prevent the phenomenon of slow-drying of printed matter, the height of stacked printed products should be reduced, the pile of paper should be shaken, and the semi-finished product can be ventilated to allow air to penetrate into the stacked paper, shortening the time of oxidizing and conjunctiva.

(2) If the printing is urgently needed, use the original graphic printing plate for dry oil overprinting, the formula is 70% of Wei Li oil and 30% of dry oil.

(3) In order to prevent unfavorable drying factors, add appropriate amount of dry oil. The amount of dry oil is: winter is more than summer, the latter color is more than the previous one, and the diluted ink is more than the diluted ink.