The operators of the PS version of the beginners' development (using manual development as an example) have a common problem. That is, the development of the PS version is only to put the slick PS plate into the developing tank for a few shakes, and then rinse with water. Developing ink, removing dirt, and applying plastic can be fine. There is no technology to talk about. The fact that the PS version of the development is a technical requirement, it is a chemical reaction process, the use of the photosensitive layer of light is not soluble in dilute alkaline solution, and see the light of the photosensitive layer is soluble in dilute alkaline solution characteristics. This is something that every operator should know. To master the PS version of the development technology, the following points should be noted.
1, understand the PS version of its own performance
At present, because of the slight difference in the technology of the PS plates produced by various manufacturers, the products also have their own characteristics. The PS plate with more than 4g (thicker) oxide layer per square meter and high temperature base sealing treatment has good alkali resistance, and contains less than 4g (thinner) oxide layer per square meter, without high temperature Sealed or non-oxidized PS plates with only a hydrophilic layer exhibit weak alkali resistance. In addition, the same PS version has different performance due to different production dates. The operator must understand the performance of the PS plate used, so as to correctly select whether the developing agent is a strong base or a weak base, so that the development speed of the PS plate can be accelerated, and the hydrophilicity of the plate and the printing plate can be increased. , extend the life of the printing plate. In addition, it should also take into account its negative effects on the erosion and dissolution of the surface oxide layer and photosensitive layer of the printing plate, and the hydrophilicity of the plate surface.
2, understand the concentration of the formulated developer
To properly place the PS plate, it is necessary to know the developer concentration. Because the alkali resistance of the PS plate produced by each manufacturer is different, the developer concentration should also be different (hands-on ratio is usually: one liter of developer base against three liters of water). Although the higher the concentration, the faster the development, but the concentration is too high, the photosensitive layer will not have some of the light to dissolve, light to make it drop in ink, dot network, in serious cases can easily cause the flower version or version, There is a broken line in the long and thin lines, the discoloration of the layout (purple), and the resistance to printing on the machine is extremely low. When the concentration is low, the development speed is slow, and the increase in the development time even results in incomplete development. When the machine is on the machine, there is a noticeable shading on the dirty or layout surface, and the characters and the shading cannot be distinguished.
3, control the temperature of the developer
In a certain range, the temperature of the developer is proportional to the developing speed, the high temperature is a high developing speed, and the low temperature is a slow developing speed. The optimum temperature is room temperature, which is the optimum temperature for PS plate development, because under this temperature condition, the operator can visually observe the development of the PS plate without large deviations. If the temperature is lower than 5°C, the developing speed becomes rather slow and almost stops. At this time, an appropriate amount of developer formulated with hot water should be added to raise the temperature. When the temperature is higher than 35°C, the dissolution rate of the developing solution to the photosensitive layer and the aluminum oxide layer is accelerated. At this time, it is necessary to take cooling measures. In addition, the hot and cold weather may also affect the development of the PS plate. In particular, when the season is changed, the PS plate may be scrapped or the printing quality may be degraded due to the unstable development temperature. At this time, the operator is required to properly adjust the temperature or concentration of the developer according to experience.
1, understand the PS version of its own performance
At present, because of the slight difference in the technology of the PS plates produced by various manufacturers, the products also have their own characteristics. The PS plate with more than 4g (thicker) oxide layer per square meter and high temperature base sealing treatment has good alkali resistance, and contains less than 4g (thinner) oxide layer per square meter, without high temperature Sealed or non-oxidized PS plates with only a hydrophilic layer exhibit weak alkali resistance. In addition, the same PS version has different performance due to different production dates. The operator must understand the performance of the PS plate used, so as to correctly select whether the developing agent is a strong base or a weak base, so that the development speed of the PS plate can be accelerated, and the hydrophilicity of the plate and the printing plate can be increased. , extend the life of the printing plate. In addition, it should also take into account its negative effects on the erosion and dissolution of the surface oxide layer and photosensitive layer of the printing plate, and the hydrophilicity of the plate surface.
2, understand the concentration of the formulated developer
To properly place the PS plate, it is necessary to know the developer concentration. Because the alkali resistance of the PS plate produced by each manufacturer is different, the developer concentration should also be different (hands-on ratio is usually: one liter of developer base against three liters of water). Although the higher the concentration, the faster the development, but the concentration is too high, the photosensitive layer will not have some of the light to dissolve, light to make it drop in ink, dot network, in serious cases can easily cause the flower version or version, There is a broken line in the long and thin lines, the discoloration of the layout (purple), and the resistance to printing on the machine is extremely low. When the concentration is low, the development speed is slow, and the increase in the development time even results in incomplete development. When the machine is on the machine, there is a noticeable shading on the dirty or layout surface, and the characters and the shading cannot be distinguished.
3, control the temperature of the developer
In a certain range, the temperature of the developer is proportional to the developing speed, the high temperature is a high developing speed, and the low temperature is a slow developing speed. The optimum temperature is room temperature, which is the optimum temperature for PS plate development, because under this temperature condition, the operator can visually observe the development of the PS plate without large deviations. If the temperature is lower than 5°C, the developing speed becomes rather slow and almost stops. At this time, an appropriate amount of developer formulated with hot water should be added to raise the temperature. When the temperature is higher than 35°C, the dissolution rate of the developing solution to the photosensitive layer and the aluminum oxide layer is accelerated. At this time, it is necessary to take cooling measures. In addition, the hot and cold weather may also affect the development of the PS plate. In particular, when the season is changed, the PS plate may be scrapped or the printing quality may be degraded due to the unstable development temperature. At this time, the operator is required to properly adjust the temperature or concentration of the developer according to experience.
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