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Color Newspaper Printing Ink And Water Balance Control
- May 29, 2018 -

The ink balance directly affects the printing quality. The ink-balance printing control of color newspaper printing is more difficult than other printing processes. Here, the author will summarize his experience in controlling the balance of ink and wash and share it with readers during his ten years of experience in color printing.

(1) Before starting the machine, the pressure and condition of the water and ink paths should be checked to ensure that the water and the ink are even and smooth.

(2) The key to ink-water balance is to control the amount of water (flood solution). The amount of pre-adjusted water should not be too large, otherwise it will cause printing failures such as ink deposition and deinking, and it also poses hidden dangers for ink-water balance control. At the same time pre-adjusted ink volume can not be too small, otherwise it will cause the layout to be white.

(3) When the printer is turned on, the dampening fluid supply system of the printer will automatically increase the amount of water over a period of time, so generally no human intervention is required. If it is necessary to artificially increase the amount of water, it is certain that there are certain problems in mechanical adjustment, concentration of fountain solution, and pre-adjusted amount of ink, etc. Only by inspecting problems and solving problems in a targeted manner can we ensure the quality of newspapers and reduce waste and secondary newspapers. Quantity.

(4) Control the amount of water according to the speed of the press. The higher the printing speed, the lower the amount of water absorbed by the paper. At this time the water is mainly used to balance the ink on the printing plate, so the overall water supply will continue to decrease as the printing speed increases, eventually reaching a critical value.

(5) When the printer runs at a high speed, the lower the supply of water, the better. In actual production, due to the high printing speed, a large amount of heat is generated on the surface of the printing plate, and the fountain solution not only can harmonize the ink-water balance, but also can help the plate to radiate heat and cool down.

(6) Control the tension of the tape to avoid breaking the paper. Colour newspaper printing is done by a web offset press. Any breaks will affect the supply of water and ink.

(7) Remove the dirt on the water, ink roller, and excessive ink in the ink path in time. If there are too many ink deposits in the ink path, the amount of water must be increased to prevent the printing plate from appearing dirty when it is turned on. This will cause water and ink to form a thick layer on the blanket and the graphic portion of the printing plate. There are ink layers of paper powder and paper hair, which lead to imprints of printed materials that are not true, easy to drop ink, and dots are enlarged and not clean, and the pictures are imaginary and dark.

(8) Frequently check the ratio, pH, and conductivity of each component of the fountain solution and control it in the normal range (conductivity is generally in the range of 1000 to 1400 μS/cm, and the pH is generally 4.8 to 5.3).

(9) Pay attention to the temperature and humidity of the ink storage environment. Especially in cold or dry seasons, the temperature and humidity of the ink storage environment should be up to standard.

(10) The captain’s observation of the ink color of the color newspaper will definitely affect the control of ink and water balance. The captain must master the following color-seeking methods: 1 It is necessary to look at the large-size title in the front page, but also to control the front page layout ink in combination with pictures, lines, mesh toning blocks, and field blocks. 2 Pay attention to the ink on both sides of the layout. The adjustment of the ink in this area is more difficult, because they are all on the edge of the blank space of the printing plate. 3 If there is dirt on the plate, don't blindly think that it is caused by small ink, but you should find out why the water roller, ink roller, eraser layout, or improper pressure may cause the plate to be dirty. . 4 Note the ink in the vicinity of the vertical field headlines. 5 Note the ink color when the layout picture is more, and the black ink should be even and the black ink volume should not be too large. 6 When the ink volume is too small and the picture size is too large in the same layout or distance, the amount of ink should be taken into consideration. When the large size words of the screen adjustment text and the field are in the same layout, they should take care of each other and make ink meet the requirements of the proofs. 7 When observing the size of the ink, don't look out at the newspaper. If the eyes can't find the accumulation point for a long time, it will be easy to fatigue and affect the vision.

Although there are many factors that affect the balance of water and ink, it is difficult to quantify the operation accurately. However, in production practice, the captain may make appropriate adjustments according to the changes in conditions, so that the ink-water balance can reach a better state and improve the print quality of the newspaper.

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