The word paste is often interpreted as dirty, blocked, or stained. Different print forms will have different pastes. In recent years, stencil printing has repeatedly appeared in transparent ink printing and composite ink printing. Such as offset printing paste, often due to ink imbalance (the pH of the syrup and the pH value of the ink) caused. The gravure stencil was mostly caused by the scraping of the squeegee, and it was mostly in the high summer temperatures. When we discuss this failure, it is not difficult to find that the ink of printing ink determines this phenomenon. It is impractical to determine in a general manner what the reason is, which is unrealistic, which hinders us from remediating and rectifying it in a very short time in actual printing operations. 
First, the letterpress version
The most obvious printing phenomenon such as "product", "day", "mouth", etc. is filled with ink into a solid-like form, even if the dots are connected together, so it is often referred to as blocked version. (1) The reason is that the dryness of the ink is too large, which makes the ink dry or sticky too early, resulting in a small dot of ink on the paper or plastic or paper or plastic debris concentrated on the plate or outlet; (2) The ink dries too fast, the ink crust in the ink fountain or has dry hard particles; (3) The ink is too thin and the ink is squeezed out under the printing pressure; (4) The paper or plastic absorbs too much of the linking material, resulting in the pigment in the ink Excessive content; (5) The roller has flaws or inconvenience; (6) The printed letterpress is not plain or too high; (7) It is too thick on a sheet of paper or a smooth plastic (especially a plastic woven bag). Ink; (8) Too much ink or too dry. 
Exclusion methods are: (1) use dry and reasonable and thick ink; (2) high-profile parts or outlets to reduce printing pressure; (3) re-filter the ink 15 ~ 25μm); (4) on the printing side to The base paper and plastic separate or replace the substrate; (5) Add thickener ink in the thick ink to increase the flow rate of the ink; (6) Accelerate the dry ink or solvent; (7) The dye ink should be reduced Resin content; (8) reduce the ink supply or add slower ink inhibitors; (9) do not let the wind on the drying device onto the plate; (10) add TM3 or silicone oil to the ink. 
Second, the lithographic version (print) paste version 
1. Lithography (Indian) Oil (greasy) The form of its performance is: the lines of the graphic lines spread out without being clear and complete. In the blank areas, there are grungy marks of different ink levels, especially on the blankets. A piece of ink. The reason for this is: (1) The water-absorbing portion on the printing plate forms an ink-absorbing center, resulting in migration of the surfactant in the paper or plastic ink layer to the water-absorbing zone. (2) The pH difference between ink and water is too large (that is, ink and ink is often unbalanced), which causes the metal of the printing plate to be dissolved by the acid in the solution and the printing plate is not clean. (3) The slurry containing dry lead is used. When oil is used, especially when the amount is too much, the dry oil is destroyed by the highly acidic syrup, and is covered by a thin layer of ink (usually also leads to yellowing of the entire panel) because the ink layer hinders the moisturizing. (4) The ink is too oily and too thick, resulting in insufficient amount of water on the plate (5) Non-printing area is lack of inductive processing and the pressure of the ink roller is large, the desiccant is not properly applied, and the water Poor roll quality or poor installation
The usual treatment methods are: (1) the pH of the ink should be lowered to approach the pH of the drug solution; (2) add wax or sodium silicate to the ink; (3) check the quality of the printing plate and the water roller; ( 4) Control the printing speed; (5) The ink is as thin as possible; (6) Choose a small and thick oily ink. 
2. Limb (print) Dirty manifestations are that the printing plate is full of light ink and can be easily transferred to the blanket and then transferred to paper or plastic. Sometimes it is easy to wipe off, but it quickly reappears. According to the floating phenomenon, people often think that the ink is floating on water or dissolved in water. Therefore, some people call the disaster water or ink bleeding. The reasons are: (1) The surface active material in the paper is leached to form an emulsion of the ink in water, which is then filled with moisture-absorbing parts of the printing plate. (2) The pigment in the ink is poor in lipophilicity and is not sufficiently wetted by the binder (such as the ink produced by the medium yellow pigment can easily run into the water). (3) When the synthetic resin uses a low-temperature dissolving binder and the content of the ink oil is relatively high, the ink emulsification is easily caused. 
The usual methods are: (1) The ink should be stored for a period of time after it is produced; (2) The resin in the ink should have good wettability to the pigment; (3) The acid value of the syrup should be reduced as much as possible, and the amount of ink should be reduced. (4) adding a viscous resin solution; (5) using oil-absorbent or surface treated with hydrophobic additives and other pigments. 