At present, there are two kinds of PS versions on the market, Yin and PS, especially the PS version is the most commonly used. The following focuses on the use of the Yangtu PS version. The Yangtu version is a photo-decomposition type and also a positive picture. Since it is a photodecomposition type, what we want to achieve is the non-graphic part of the photodecomposition, which must be effectively removed without being dirty, and the graphic part can not only resist printing, but also reflect its high-profile part (usually we The high-profile part of the finger means that the dot reproduction should be more than 3%, and even the resolution of 0.5% should ensure a continuous line of 10μm or even μm), which can better achieve the realistic effect of printing.
The following highlights the main points in the use of the PS version:
1. Exposure: Expose the PS plate coated with a photosensitive layer on the workbench of the plate-making machine, put the negative film, and make the pattern on the negative film show the basic "image" on the PS plate through the main light and light exposure twice. Note: The exposure conditions of the PS version of each model are recommended to use â‘ a light source of 3KW iodine gallium lamp â‘¡ the distance of the lamp version is 1m). It is recommended that the best use of light source is iodine gallium lamp, in order to achieve the best photolysis effect of the light source on the PS version; if the lamp of the printing machine is aging (exposure time is increased by 20% compared with the new lamp), it is recommended to replace the lamp to improve Work efficiency and use effect of PS version.
2. PS version of air-conducting particle technology is a more commonly used technology in the international printing equipment manufacturing industry. It can greatly improve the vacuum speed and effect of PS version and avoid sunburn. Therefore, it is recommended that manufacturers use the PS version with mature air-conducting particle technology.
3. There is no formal test strip. Simple test strips such as the Chinese Academy of Sciences can also be used, and the price is cheaper. Generally, the PS version of the sun-printed PS plate under normal development conditions should be completely white without ink It is also the best exposure. What if these ladders are not available? First, make a judgment based on the manufacturer's instruction manual combined with its own light source and lamp distance. For example, the PS version manufacturer recommends a light source of 3KW iodine gallium lamp. The lamp distance is 1 meter, and your light source is 4KW, the lamp distance is also 1 meter, then the first thing you consider is to shorten the exposure time, and then think about how long your own light source lamp has been used, compared with whether it is newly bought There is a possibility of aging, so that you will choose the exposure amount more reasonably, and if your lamp distance changes, then according to the theory that the light energy decreases with distance, the exposure time can be appropriately increased or decreased. The second experience is to stick a small piece of transparent tape on a blank part of the film that is not in the picture and text. Select the usual exposure amount. After exposure, directly observe the edge line of the tape just to disappear but not completely disappear. Generally, under normal development conditions, the borderline will just disappear without ink, and if the borderline is obvious or not visible at all after exposure, it means that the exposure is insufficient or strong.
4. Development: The PS plate after development will be placed flat in the development tank, so that the developer is fully moistened with it. After about 1 minute, the PS plate is taken out and placed on the plate washing table to rinse off the dissolved coating on the plate surface. "Image" appears.
Most printing companies have such a situation. There is no heating indoors in winter and no air conditioning in summer, so the room is very similar to the outdoor temperature. The development temperature in summer is sometimes as high as 30 degrees or more, and in winter it is even below 15 degrees. Even lower, it is difficult to grasp simply by increasing or decreasing the development time and the concentration of the developer. It is very difficult for people with inconsistent or different methods. Some manufacturers use developer powder without heating water to dissolve, resulting in insufficient powder dissolution and easy to stay on the surface of the PS plate, causing damage to the photosensitive film of the PS plate. In short, the development temperature of the PS plate is very critical and is often used by printing manufacturers. Ignore the problem; if there is no way to control it, add or subtract potions. However, it is often that the medicine strength in winter is not enough to gradually increase the concentration, and in summer, it is ignored that the medicine is not used according to the formula concentration, so there are many problems. Therefore, I suggest that a conditioner can be equipped with an air conditioner based on the formula specified by the manufacturer, so that the ambient temperature and the development temperature will not deviate too much. Generally, the development temperature of the PS version is 23 ± 2 ℃, so the indoor environment is about 0-25 ℃. If there is no such condition, it is recommended that manufacturers prepare hot water in the winter and put it next to the developing machine or the developing tank. You can add a little hot water at any time, and then observe the temperature fluctuation range. In summer, you can get some ice or gradually add cold water to observe the temperature change, so as to achieve the best development effect.
5. Development time: the tolerance of the development time provided by the general PS plate factory is relatively large, generally 20 seconds to 1 minute, the problem is that the amount of development time must be based on understanding the concentration and temperature of the developer, so that the development time is tolerant Degree can make up for the non-standard of the above two. As we all know, if the concentration of the developer is appropriate and the temperature is high, the development time should be reduced, and other changes are the same. In short. The developer concentration, temperature, and development time complement each other. The changes must be mastered by the platemaker, but it must be pointed out that this mastery is passive. If you want to use the PS version correctly, it is recommended to strictly follow the temperature It is best to use the concentration and time of the drug solution, and the change range should not be too large.
6. Revision: revision is unacceptable to most printing companies, especially newspapers and book printing companies that use a large number of editions. They have to print hundreds of editions in a short period of time a few days. The task is indeed Heavy, if re-editing, it will increase the workload, but the PS version of the production of the film is a single sheet, not the imposition or composite imposition of film, but now most manufacturers, especially newspapers and book factories imposition There are many more, which poses a problem for PS plate manufacturers. How to remove the borders and tiny dots of the printed version. In addition to the improvement of the principle of light refraction by the printing machine, the manufacturers of PS version adopt more complex The layer sand structure and the wear resistance of the PS photosensitive layer have greatly improved, but the edge cannot be completely eliminated, because some printing machines have no secondary exposure and no light source scattering. What should I do? In addition to the work done by PS version manufacturers, I think that printing companies should pay attention to the use of PS plates when purchasing PS plates, and ask whether the plates are light source of iodine gallium and whether there is light scattering effect. Is there a double exposure. Second, try to use a single piece of film when making film. Third, try to lightly scrape the edges of the film together with a blade during imposition, which will better eliminate the edges, because everyone knows that the film is almost transparent, then the edge is affected by the external environment, such as using it by hand The density increases significantly, and it is easy to form a borderline. If the edges are thinned during imposition, the efficiency of the PS version will be greatly improved. Thereby reducing the difficult-to-manipulate links such as plate revision in the printing process and improving the work efficiency.
7. Glue: The current PS version is due to the purpose of composite multi-layer sand. It is also very easy to use without gluing, but the problem is that some manufacturers do not store well after the development, including indoor and outdoor and take the plate to the machine. After good glue will form a protective film on the non-graphic part of the PS version, the external dust particles and dirt can not enter the sand mesh, it is very easy to open the version, protecting the hydrophilic layer. The problem does not occur with glue, because most users do not pay attention to the intermediate link after development and before the machine, and put the plate at will, causing a lot of dirt to fall on the plate or stick to the plate. There is a photosensitive layer that will not adhere to the dirt, and the non-graphic part is very easy to adsorb due to the sand, and it is very troublesome to clean. This will cause spot-like dirt on the non-graphic part when the machine is on. Affect the printing quality, so it is best to glue. And pay attention to the uniform glue layer, the concentration is not too large, a thin layer can achieve the effect.
8. Baking version: The baking version should be operated strictly according to the recommended temperature and time. If the time is too short or the temperature is too low, the baking effect will not be achieved; too long time and high temperature will seriously affect the performance of the plate, especially not just The degree of discoloration of the layout is the basis for judging the baked version. When baking plate, high-quality baking glue should be selected, and the baking plate temperature should be 220-240 ℃. The baking time is about 5-10 minutes.
9. Storage and unsealing: Light and heat easily cause chemical changes to the coating. The recommended storage conditions are 10-30 ℃ and relative humidity no more than 60%. Unsealing should be carried out under a yellow light; it is recommended that the edition room should be shielded from natural light, and the other light sources should be yellow lights except for the light source. Handle the plate gently to prevent collision, folding and falling. The height of palletizing should not exceed 1.8 meters.
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