With the advancement of PS plate processing technology, the printability of PS plate is getting better and better, and the printing durability is getting higher and higher. However, the print resistance of the same plate is very different on different models. For example, on the BB machine, the print resistance of the PS version is very low. In order to improve the printing durability of the printing plate, the PS version needs to be baked. The baked PS version can increase the printing resistance by 3 to 4 times, but in the baking process, if the operation is not correct, it will cause some disadvantages. , Not only can not save plates but waste. Let's talk about the causes and solutions of the color changes of the layout after baking and the ink inking during printing. 1. The abnormal situation of the color change of the PS version after baking After the PS plate is baked, the color of the photosensitive layer on the plate surface will change to a certain extent. Under normal circumstances, after the printing plate is baked at a constant temperature of 230 ~ 250 ℃ for 5 ~ 8min, the photosensitive layer changes from the original green to reddish brown, but if there is any link such as printing, development, baking temperature and baking time, etc. Improper control will have an impact on the quality of the roasted plate, and make the color of the plate abnormal. 1. The blank part of the layout is light red after baking After the PS plate is baked, the normal color of the drug film surface is reddish brown, and the blank part of the plate is the basic color of the plate. If the blank part of the plate appears light red, it is because there is a small amount of photosensitive layer, which is caused by baking. If after baking for a second development, its light red color disappears, it will not cause staining during printing. If the blank part of the layout is still light red after the second development, it may cause staining during printing. In this case, gently wipe with pumice powder to reduce or eliminate the staining. Save, this edition is scrapped. The former's trace photosensitive layer is caused by the PS plate being left too long or the temperature during coating is too high, which causes the oxidation of the photosensitive layer and the Al2O3 of the aluminum plate base. This trace substance generally does not cause staining. Baking will not cause staining, the latter is mostly caused by underexposure or underdevelopment, so it will also cause staining. Therefore, more attention should be paid to the printing time and development control of the printing plate to be baked. 2. After baking, the photosensitive layer of the layout is dark brown or dark brown The appearance of such a color indicates that the baking temperature is too high or the baking time is too long, which partially carbonizes the resin in the photosensitive layer. At the same time, the plate base will also deform, soften, and weaken the mechanical strength, which will affect the printing plate. Print resistance, the darker the color, the lower the print resistance, the solution is to reduce the baking temperature or reduce the baking time. 3. The photosensitive layer of the layout is dark green after baking The photosensitive layer after baking is in this color, indicating that the baking temperature is too low or the baking time is too short. The resin in the photosensitive layer is not fully cured, the purpose of baking is not achieved, and the print resistance is also low. In this case, you can immediately put it back into the baking machine, extend the time or increase the temperature for a second baking, so that the color tone of the baking plate reaches reddish brown. Second, the abnormal situation of the ink on the layout when printing on the machine after baking Although it can be seen from the layout color whether the roasted printing plate is qualified, but sometimes the layout color is normal, but when printing on the machine, there are problems such as dirty and incomplete ink. 1. When printing on the machine, there is a phenomenon of “incomplete ink†on the layout Before baking the plate, apply a protective agent to the PS plate. The main component of the protective agent is an emulsifier, which has hydrophilic and oleophobic properties. When the protective agent coating is too thick, it is more difficult to dissolve in the developer with a lower concentration. (After baking, you need to wash off the protective agent with PS plate developer, that is, secondary development). Therefore, there will still be a part of the protective agent left on the surface of the plate, causing no ink. This "track" phenomenon is due to the unevenness of the protective agent applied and the traces left behind unevenly. In this case, you can use the developer that is slightly thicker than the general PS version developer to wash it once. After brushing, neutralize the plate surface with 3% phosphoric acid. After washing, use the PS version developer to pick up the ink, or directly wipe it with gasoline repeatedly. The printing plate can also play the role of lifting ink, which can eliminate the situation that the "track" is not filled with ink. 2. Partly dirty or full version dirty when printing on the machine There are generally two cases of this phenomenon. First, if this upper soil is washed with gasoline, the bottom layer has a reddish brown baking layer, which means that the development is insufficient, and this soil is generally not easy to remove. Second, if there is no reddish-brown baking layer, it means that the concentration of the protective solution is too low, and the applied protective layer is too thin, which does not play a role in protecting the plate from contamination. This kind of pollution cannot be found immediately. It can only be found after the printing plate is inked or printed. Although this kind of staining is more difficult to solve, you can wipe the printing plate with the PS version of the revision paste (the revision paste is baked. The drug film does not work), can eliminate the phenomenon of dirty. If the solute is precipitated due to the long-term protection of the baking solution, the concentration of the solution poured out first is low, and the applied protective layer will be too thin, and in serious cases, it will cause soiling. Therefore, before each use, it should be shaken or stirred to make the mixture even, so as to avoid the occurrence of the above-mentioned defects. [next] 3. After printing on the machine, the film mark or tape mark gradually appears on the page. After the printing plate is baked, the dirty spots and film marks on the plate can not be repaired with the repair paste, so the operator generally has to carefully check and repair the printing plate before baking, but sometimes the print and print The tape imprint is very light, and it is not easy to be found during revision. After baking, if you can find a very light red-brown imprint, the imprint of the film will become more and more obvious after printing on the machine. In this case, you can use the pumice stick to rub the blot on the printing plate, then use the repair paste to wipe the place where the pumice stick has wiped, and finally wipe the printing plate clean with a water cloth to eliminate the above marks. 3. Problems that should be paid attention to when applying protective agent and baking plate If some parts are not protected before baking, a part of the pores of the oxide layer that were originally sealed are reopened. The changes during baking are as follows: These micropores have extremely strong adsorption, so the blank part is very easy to be contaminated, and if the protection is not properly printed, it will cause staining. 1. Method of applying protective agent Dirty the developed printing plate, rinse it with water, scrape off the moisture on the plate surface, pour the protective agent on the plate surface, use about 20 ~ 30ml for each folio plate, and then wipe the entire plate surface with degreasing gauze Even (note that it must be even, there must be no traces of water flow), you can put it in the baking machine to bake the plate. The baking time is 5 ~ 8min. After the plate is taken out to cool, the developer is used for secondary development to remove the protective agent on the plate surface. After air-drying, rub the gum arabic to wait for printing. 2. Matters needing attention After baking, the photosensitive drug film is very firmly adsorbed on the plate surface, and it is difficult to remove it from the plate surface with a repair paste, so the printing plate must be repaired before baking. After the revision, be sure to rinse off the revision paste with water, otherwise the residue of revision paste and the dirt removed will contaminate the plate surface and cause the printing plate to become dirty during baking. Do not use too much of the protective agent. Too much will cause water-like traces. In serious cases, the above-mentioned "dragon" -like phenomenon of incomplete ink will appear, but the amount should not be too small, otherwise it will lose protection and become dirty. The dosage is generally controlled so that there is no water-like trace after rubbing. When applying the protective agent, use degreased gauze to prevent the shed fibers from contaminating the plate during baking. Do not apply too much force when rubbing, so as to avoid the shedding of gauze fibers and affect the quality of baking. The baking temperature and baking time should be determined according to the level of the curing point of the photosensitive layer: too high baking temperature or too long time will cause the carbonization and deterioration of the photosensitive layer, deformation and softening of the base, affecting the printing plate durability Too low or too little time will make the curing degree insufficient, and the baking effect will not be achieved. After baking the plate, it must be allowed to cool naturally, and do not force cooling, so as not to deform the aluminum base. After the plate is naturally cooled, the PS plate developer is used for secondary development.
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