Fourth, the developer concentration control Different manufacturers, the printing company's PS version of the photosensitive agent composition is not the same, the developer (kit medicine) ratio, concentration, etc. are different. For example, the "Starlight" brand PS plate developer kits produced by the China Institute of Printing Science and Technology are in a ratio of 7.50 grams of solid developer powder and 5000C of warm water. C. The use of the liquid is: 1 part of the concentrate plus 6 parts of water. This rule is the best formula that the manufacturer prefers.
Individual printing companies have great arbitrariness in the preparation of the PS version of the developer. The application is not standardized enough, which seriously affects the quality of the printing plate and the stability of the printing rate. It can be appreciated from practical work that the concentration of the developer is too large and the alkalinity increases. When the exposed portion is decomposed, no part of the light is decomposed at the same time, so that the strength of the film surface is decreased, and the printing ink performance is also reduced. Will be reduced accordingly, causing serious film peeling (off plate). When this happens, it will affect the quality of the printed product, but it will cause waste. In addition, when the developing solution is too concentrated to dissolve the film layer in the blank area, it will also erode the part of the oxide layer, thereby reducing the printing rate of the printing plate, which virtually increases the cost of the printing process.
In practice, too low a developer concentration can also have an adverse effect. If the developing concentration is not enough, the blank film will not be completely dissolved, causing various stains on the plate. If the developing time is prolonged, it will produce the same effect as the over-concentration of the developer.
The specific ratio of the PS version of the developer is the data obtained after many tests, which can guarantee the basic reproduction of the 1%-2% fine dot of the image version, complete 3%-4% dot network, and 98% dot-pasting; the fine text is not missing The pen breaks the path, the No. 6 character is clear, and the quality requirements such as black body and multiple strokes do not stick to death.
Fifth, control the development temperature and development time PS version of the entire development process is a redox reaction process, naturally subject to liquid temperature and time constraints. If the temperature of the developer is too high, the speed at which the photosensitive layer is dissolved must be high and the time required will naturally be short. For example, when the liquid temperature exceeds 30° C., the binding force between the photosensitive material and the polymer resin will be weakened, and the resistance of the printing plate will be reduced, and in some cases, the photosensitive film may fall off. When the temperature of the developer is too low, the development time will inevitably increase, and the figures and text parts will also be excessively eroded to reduce the printing durability of the printing plate.
At present, there is still a considerable amount of manual development, and there is no control method for the liquid temperature, which is one of the reasons for the low resistance of the printing plate. Therefore, companies should try to control the temperature of the developer within the range of 18°C-25°C according to their own conditions.
Enterprises developing with the developer tank should have measures to protect the developer from oxidation. On the one hand, it is necessary to strengthen the standard operation of the developer concentration, temperature, and development time. On the other hand, the developer should be capped on the developer tank (not covered when not in use). ), to prevent oxidation and evaporation and weaken the development.
Sixth, to strengthen the layout of awareness of the layout simply said that the layout is the positive version of the PS version of the positive version of the layout after the eraser and the eraser before the dirty part of the layout, is the layout of the text on the outside of the superscript lines, corners, dirty, scratch Marks, strips, blots, etc. get rid of the work.
The operation of the layout except for dirty is simple, but it must have a strong sense of quality, so that careful inspection, careful operation, to prevent the removal of dirty liquid to the drawings, text parts caused by the waste version.
The author found in the random inspections and examinations of books and products that there were often residual marks, corners, tape marks, imposition traces, and other stains in the layout, and even the fact that the drawings and texts were partially smeared, which seriously affected the situation. Improve the level of print quality of books and periodicals. Therefore, in the printing plate printing should strengthen the layout of the work to ensure that the layout of the clean, in order to improve the printing quality of books to create a good condition.
Individual printing companies have great arbitrariness in the preparation of the PS version of the developer. The application is not standardized enough, which seriously affects the quality of the printing plate and the stability of the printing rate. It can be appreciated from practical work that the concentration of the developer is too large and the alkalinity increases. When the exposed portion is decomposed, no part of the light is decomposed at the same time, so that the strength of the film surface is decreased, and the printing ink performance is also reduced. Will be reduced accordingly, causing serious film peeling (off plate). When this happens, it will affect the quality of the printed product, but it will cause waste. In addition, when the developing solution is too concentrated to dissolve the film layer in the blank area, it will also erode the part of the oxide layer, thereby reducing the printing rate of the printing plate, which virtually increases the cost of the printing process.
In practice, too low a developer concentration can also have an adverse effect. If the developing concentration is not enough, the blank film will not be completely dissolved, causing various stains on the plate. If the developing time is prolonged, it will produce the same effect as the over-concentration of the developer.
The specific ratio of the PS version of the developer is the data obtained after many tests, which can guarantee the basic reproduction of the 1%-2% fine dot of the image version, complete 3%-4% dot network, and 98% dot-pasting; the fine text is not missing The pen breaks the path, the No. 6 character is clear, and the quality requirements such as black body and multiple strokes do not stick to death.
Fifth, control the development temperature and development time PS version of the entire development process is a redox reaction process, naturally subject to liquid temperature and time constraints. If the temperature of the developer is too high, the speed at which the photosensitive layer is dissolved must be high and the time required will naturally be short. For example, when the liquid temperature exceeds 30° C., the binding force between the photosensitive material and the polymer resin will be weakened, and the resistance of the printing plate will be reduced, and in some cases, the photosensitive film may fall off. When the temperature of the developer is too low, the development time will inevitably increase, and the figures and text parts will also be excessively eroded to reduce the printing durability of the printing plate.
At present, there is still a considerable amount of manual development, and there is no control method for the liquid temperature, which is one of the reasons for the low resistance of the printing plate. Therefore, companies should try to control the temperature of the developer within the range of 18°C-25°C according to their own conditions.
Enterprises developing with the developer tank should have measures to protect the developer from oxidation. On the one hand, it is necessary to strengthen the standard operation of the developer concentration, temperature, and development time. On the other hand, the developer should be capped on the developer tank (not covered when not in use). ), to prevent oxidation and evaporation and weaken the development.
Sixth, to strengthen the layout of awareness of the layout simply said that the layout is the positive version of the PS version of the positive version of the layout after the eraser and the eraser before the dirty part of the layout, is the layout of the text on the outside of the superscript lines, corners, dirty, scratch Marks, strips, blots, etc. get rid of the work.
The operation of the layout except for dirty is simple, but it must have a strong sense of quality, so that careful inspection, careful operation, to prevent the removal of dirty liquid to the drawings, text parts caused by the waste version.
The author found in the random inspections and examinations of books and products that there were often residual marks, corners, tape marks, imposition traces, and other stains in the layout, and even the fact that the drawings and texts were partially smeared, which seriously affected the situation. Improve the level of print quality of books and periodicals. Therefore, in the printing plate printing should strengthen the layout of the work to ensure that the layout of the clean, in order to improve the printing quality of books to create a good condition.
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