Talking about the main points of the sun chart PS version
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At present, the PS version on the market has two kinds of negative and positive images, especially the positive version of the PS version. The following is a brief introduction to the use of the PS version of the positive image. The positive version is a photo-decomposition type and also a positive image. Since it is a photodecomposing type, what we want to achieve is to see the non-image part of the light decomposition, which must be effectively removed, not dirty, and the graphic part can not only resist printing, but also reflect its high-profile part (usually we The high-profile part means that the dot reproduction should be above 3%, and even the resolution of 0.5% should be guaranteed to be 10μm or even μm. It is better to achieve the realistic effect of printing.
The following highlights the main points in the use of the PS version:
1. Exposure: Exposure is to apply the PS plate coated with the photosensitive layer on the working table of the printing machine. Place the film and expose the pattern on the film to the basic “image” on the PS plate by double exposure of the main light and the light transmission. Note: For the exposure conditions of each model PS version, it is recommended to use 1 illuminating lamp with a light source of 3KW and 2 lamp plate spacing of 1m). It is recommended that the best use of the light source is iodine gallium lamp to achieve the best photolysis effect of the light source on the PS plate; if the lamp of the plate printer is aging (the exposure time is 20% higher than the new lamp), it is recommended to replace the lamp to improve Work efficiency and the use of the PS version.
2, PS version of air-guided particle technology is a commonly used technology in the international printing equipment manufacturing industry, it can greatly improve the vacuum speed and effect of the PS version, to avoid sunburn, so it is recommended that manufacturers use the PS version of the mature use of air-conditioning particles technology.
3, there is no formal test strips, domestic simple test strips such as the Chinese Academy of Sciences can also be used, the price is also cheaper, the general drying PS version under normal development conditions, the third level of the gray ladder should be white but not ink Also for the best exposure, what if these ladders are not available? First, according to the manufacturer's instructions for use, combined with their own light source and lamp distance to make a judgment. For example, the PS version recommended light source is 3KW iodine gallium lamp. The light is 1 meter away, and your light source is 4KW, and the light distance is also 1 meter. Then the first thing you want to consider is to shorten the exposure time. Secondly, think about how long your own light source has been used, whether it is new or not. There is the possibility of aging, so that you will choose the exposure more reasonably, and if your lamp distance changes, the exposure time can be appropriately increased or decreased depending on the theory that the light energy decreases with increasing distance. In the second experience, a small piece of scotch tape is attached to the blank part of the non-image on the film, and the usual exposure is selected. After the exposure, the edge line of the tape is just observed to disappear, and the best exposure is not completely disappeared. Generally, under normal development conditions, the edge will just disappear without inking, and if the edge is obvious or not visible after exposure, it indicates that the exposure is insufficient or strong.
4. Development: The PS plate after development is placed in the developing tank, and the developer is fully wetted. After about 1 minute, the coating is removed and placed on the platen to rinse off the coating. "Image".
Most printing companies have such a situation, there is no heating in the winter, no air conditioning in the summer, so the room is very similar to the outdoor temperature, the summer development temperature is sometimes more than 30 degrees, and the winter is below 15 degrees. Lower, it is difficult to master the increase and decrease of the development time and increase or decrease the concentration of the developer. It is very difficult for people who are inconsistent or different to master. Adding to some manufacturers using the developer powder and not heating the water to dissolve, causing the powder to dissolve insufficiently and easily stay on the surface of the PS plate, causing damage to the PS plate photosensitive film. In short, the development temperature of the PS plate is very critical, and it is often used by the printing manufacturer. Ignore the problem; there is no way to take the addition and subtraction of the medicine to control. However, it is often that the winter medicine is not enough to gradually increase the concentration, and in the summer it is ignored that the reduction of the medicine is not used according to the formula concentration, so that there are many problems. Therefore, I suggest that the air conditioner can be equipped with conditions on the basis of the formula specified by the manufacturer, so that the ambient temperature and the development temperature do not deviate too much. General experience PS version development temperature is 23 ± 2 ° C, then the indoor ring is condensed and fascinated? 0-25 ° C or so, if this condition is not available, it is recommended that the manufacturer prepare hot water in the winter to be placed next to the developing machine or the developing tank. You can add a little hot water at any time, and then observe the fluctuation range of temperature. In the summer, you can use ice cubes or gradually add cold water to observe the change of temperature to achieve the best development effect.