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1. Dirty plates after roasting plates Dirty versions of PS plates are the most common malfunctions and are often difficult to resolve. To encounter this dirty version should first find out the reason, and then take the appropriate method to solve. If this dirty version is washed with gasoline, there is a reddish-brown baking layer at the bottom, which means that the development is not complete, there are residual photosensitive punishments are cured by baking, dirt on the ink, this dirty has a solid foundation, generally Can not afford to go, if forced to remove it, the surrounding moire will suffer. This dirty version can prevent recurrence only by increasing the exposure time of the printing plate or increasing the development intensity. If there is no red-brown baking layer under the dirty place, it may be that the concentration of the protective agent is low, the coating is too thin, and there is no effect of protecting the plate from contamination, and the micropores of the aluminum oxide film reopen at high temperature. Open, and contaminated dirty. This dirty version will show up after the ink is drawn or printed, but it will not be observed at ordinary times.
2. The rubber track, when printing is incomplete, the printing plate does not faithfully reflect the tone level of the original, but the rubber track. Colloids are often caused by improper protection of brown penalties. Because of the high concentration of the protective agent or the unevenness of the brown gum, the cured gum is fixed on the printing plate after baking and hardly soluble in the developer, resulting in no ink absorption. In this case, alkaline solution that is slightly thicker than normal developer can be used again - say,
Then use 3% phosphoric acid to neutralize and remove the gums after removing the ink.
3. Scratch In the baking plate, the high temperature causes the PS plate to deform and bend. Scratches and squeegees are often generated when the plate is taken. The printing is dirty. Slightly slashing can be used to remove the dirt and nourishing agent, and the particularly severe sculpting will damage the photographic film of the stencil and cannot be saved.
4. The light red color of the baking plate is due to a trace amount of photosensitive layer on the blank portion of the plate, which becomes after baking. If it is treated with developer, it will not get dirty. If the reddish remains on the plate after the treatment, it must be dirty. This situation can be used in addition to dirty agent treatment, and then ink inspection, generally can be resolved.
5. Dark brown or dark brown after baking The photosensitive layer is red-brown after baking. If the color is dark brown or dark brown, the baking temperature is too high or the baking time is too long. This version is over-baked version. The degree of carbonization of the photosensitive layer resin is different from that of darkening and embrittlement, and as a result, the printing resistance of the PS plate is reduced.
6. After the baking version, the dark green color indicates that the baking temperature is low or short, the photosensitive resin is completely polymerized, and the wear resistance, corrosion resistance, solvent resistance, and ink affinity have not been maximized. A second baking version can be done to achieve the best results.
7. Before grilling, the layout of the pollution caused by the printing plate on the dirty version before the PS version must be clean and clean, the layout of dust, impurities, in addition to victory and other traces of clean and clean in a timely manner, these dirt after baking will be firmly adsorbed on the layout , causing the plate to be dirty.
8. Insufficient underexposure or underdeveloped development. Insufficient underexposure or incomplete development can result in incomplete decomposition of the non-graphical part of the photosensitive resin. In printing, the ink will be smeared and dirty.
9.æ’© æ’© æ’© æ’© æ’© æ’© ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸ ä¸. The protective agent poured out is thin. The use of such a protective agent to sweep the plate will cause the layout protection film to be too thin or leaky, causing the PS plate to become dirty. Therefore, before use, be sure to shake it evenly before use, and wipe the protective agent must be rubbed evenly.
10. The cloth of the protective agent is not clean, and the fibers of the cloth or the cloth are peeled off on the plate, causing the upper plate to become dirty.
11. Dirty dirt. This is a very interesting question. At first glance, it seems that it is self-contradictory. How can it be dirty and dirty? Real production is not uncommon. The reason is also very simple, that is, the dirty marks that have been corroded by the dirt removing agent are not rinsed completely in time, and the marks that are the same as the traces of the dirty agent are reflected when printing. In order to prevent this kind of dirt from appearing, you can use a sponge or a wet towel to wipe off the dirty punishment thoroughly after the dirt is repaired, and then rinse with water to avoid dirtiness.
12. In the middle of printing, the machine did not wipe the glue in time, and there was no water roller first after the machine was turned on. The first ink roller caused a large number of ink channels on the layout. If this ink channel is washed with gasoline, the surface is clean and it will be dirty when it is turned on. In this case, you can use a clean cloth to slowly scrub the turpentine, until the ink is completely dissolved, and then rinse with water in a timely manner, you can restore the original, no stains.
13. Protective agent performance is poor and the baking plate is dirty. The performance of the protective agent used in the PS plate baking directly affects the quality of the baking plate. Many manufacturers are self-made, should pay attention to whether the formula is appropriate, whether the performance of the drug used is standard, the preparation method is appropriate. No matter which part of the link goes wrong, it will lead to the problem of protective agent performance, which will result in no protective effect of the protective agent. In particular, when certain medicines are not available, and when they are replaced with drugs that are not commonly used, special attention must be paid to the quality of the protective agent. In order to prevent the loss of the plate material, it can be tried first, and it can be put into normal production after it is not dirty and has no problem.
14. Different performances of PS plates of different brands vary greatly depending on the manufacturing method. The temperature and time required for baking the plates are different. Do not be the same, otherwise there will be various quality problems.
15. Under normal circumstances, recycled PS version is not suitable for baking version, baked PS version should not be regenerated. 
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