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Under normal circumstances, there is no special requirement for the water used to configure the developer. The user is basically using tap water or deep well water. The developer is an alkaline solution with a pH of about 13. The scale theory tells us that sodium silicate, which is one of the components of the developer, is itself an easy-to-scale material. Together with the combined action of calcium, magnesium and other metal ions introduced by water, it is more likely to cause alkaline developer. Scale. The direct effect is to cause plugging of the developer jets, causing the developer to spray unevenly, or to make the development roller calcified, thereby affecting the development quality. Therefore, it is best to use deionized water as the dosing water to slow down the fouling process of the developer.
Eight, control the appropriate development temperature
Heat is required for hydrolysis, salt formation, and salt dissolution in the developing process. If the temperature of the developer is too low, the heat required for the development process cannot be provided, which will prevent the development from proceeding smoothly; if the temperature of the developer is too high, the unexposed image portion will be dissolved. Theory and practice show that, when the temperature exceeds 30°C, the binding force between the photosensitive resin and the film-forming resin in the photosensitive layer is weakened, and the resistance to alkalinity decreases. Therefore, an appropriate development temperature is one of the prerequisites for ensuring good development quality. Under normal circumstances, it is appropriate to control the temperature of the developer at 25°C±1°C.
Nine, determine the development time
According to the accurate exposure time measured in the front, the printing plate is exposed, the machine is displayed, and the gray scale segment is observed. When the third ladder is absent, the fourth ladder is reserved, and 3% of the outlets are guaranteed, and 97% of the outlets are not pasted. , is the appropriate development time. If it does not meet the standards, re-exposure, and adjust the display time according to the last development until it is appropriate.
Ten, maintain a suitable developer concentration
After many times of development of the developer, the active ingredients in the developer are continuously consumed. Together with the effect of the photosensitive layer that is continuously dissolved in the developer, the developing ability of the developer becomes weaker and weaker, so that the developing requirement cannot be satisfied. Aging has occurred.
In practical production, it is possible to use one piece of development and control strip tracking test for each development of five plates, and then add a suitable amount of developer according to the actual situation.
When severe aging occurs, new fluids should be replaced promptly. The number of developed plates can be changed once in two days, and the number of developed plates is larger. For example, 100 or more plates are replaced daily.
Eleven, the correct way to eliminate dirty
The elimination of a certain brand of liquid may not be suitable for all PS versions. When they do not match, it may cause the dirt to be dirty when printed.
Elimination of dirty fluid should not be too long on the PS plate, otherwise it will also lead to dirt on the printed area.
Twelve, protective adhesive coating
The function of the protective glue is to protect the blank part from oxidation, so it should be as thin and uniform as possible during coating. If the coating is not uniform, it will cause the printing to be easy to get dirty, but if the coating is too thick, it will cause the graphic part not to be inked.
To sum up, in order to achieve the ideal quality of drying, we should conduct scientific analysis and strictly control the factors that affect the various aspects of the drying process, so as to reduce the waste printing rate and improve the quality of printed products. And printing efficiency.
Source: China Design Printing Network
7. Use purified water as liquid for water
February 24, 2024