Analysis of paste version of lithographic (printed) paste version

(1) The water-absorbing portion on the printing plate forms an ink-absorbing center, causing the surfactant in the paper or plastic ink layer to migrate to the water-absorbing area.

(2) The pH difference between the ink and the water is too large (that is, the water-ink imbalance is often said), which causes the metal of the printing plate to be dissolved by the acid in the medicine and the printing plate is not clean.

(3) When using a paste-like dry oil containing lead, especially when the amount is too much, the dry oil is destroyed by a highly acidic potion, which is covered by a thin ink layer (which often leads to yellowing of the entire plate) ). Because the ink layer hinders the control of wetting, it becomes oily.

(4) The ink is too oily and too thick to cause insufficient water on the plate surface.

(5) Due to lack of induction treatment and high pressure of the inking roller in the non-printing area, improperly adding desiccant, and poor quality or poor installation of the water roller. ?

The usual processing method is:

(1) The pH of the ink should be adjusted down, close to the pH of the potion;

(2) Add wax or sodium silicate to the ink;

(3) Check the quality of printing plate and water roller;

(4) Control the printing speed;

(5) The ink should be as thin as possible;

(6) Choose thick and thick ink. ?

2. The form of lithographic (printing) floating dirt is that the printing plate is full of slight ink, and it is very easy to transfer to the blanket, and then transfer to print on paper or plastic. Sometimes it is easy to wipe off, but it quickly reappears, staining in the potion. According to the phenomenon of floating dirt, people often think that it is caused by ink floating on water or dissolving in water. Therefore, some people call the disaster water or ink bleeding. Because:

(1) The surface active substance in the paper is leached to form an emulsion of ink in water, and then covered with the moisture absorption part of the printing plate surface.

(2) The pigment in the ink has poor lipophilicity and is not fully wetted by the binder (such as ink made by Zhongluo yellow pigment can easily run into water).

(3) When synthetic resin uses low temperature to dissolve binder and the content of ink oil is relatively high, it is very easy to cause emulsification of ink. ?

The usual processing methods are:

(1) After the ink is produced, it should be stored for a period of time;

(2) The resin in the ink should have good wetting of the pigment;

(3) Reduce the acid value of the potion as much as possible, and reduce the amount of water supply ink;

(4) Add viscous resin solution;

(5) Pigments with large oil absorption or surface treated with hydrophobic additives are used. ?

3. The dirty form of lithography (printing) is the appearance of large dots of ink in the non-printing area. The reason is:

(1) The printing pressure and the operation of the printer destroy the isolation membrane on the printing plate to expose the metal, and then it will be immediately affected by a small amount of surface activity, polarity, free fatty acid and other substances, causing these places to absorb ink create pollution.

(2) The excessive residual ink layer left on the plate during the development of the printing plate is a dirty plate generated on the plate.

(3) The ink is too thin and oily, soft, and insufficient viscosity, easy to cause the ink roller to slip and then make the water roller dirty.

(4) In addition to improper induction treatment or poor glue application.

(5) The insufficient water on the printing plate and the acidity of the potion are too low, which causes the water roller to absorb the ink. There are also inherent stains caused by the PS version and so on. ?

The usual processing method is:

(1) Add ink oil (resin liquid) to the ink;

(2) The content of fat and oil in the ink should be reduced as much as possible;

(3) Increase the amount of water supply, especially the acid value of the potion;

(4) Use thick ink to make the print as thin as possible;

(5) Choose a potion with higher surface tension;

(6) Adjust the pressing force between the printing plate and the rubber roller;

(7) Reduce desiccant;

(8) Replace the faster drying resin ink.

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