Analysis: How to save and use silver salt CTP plate

In recent years, the amount of silver salt CTP plates used in newspaper printing has been increasing, and the daily consumption of silver salt plates is also very large. Users are also more concerned about the problems in the use process. The author summarizes many years of production experience and believes that the preservation of silver salt CTP plates and related production conditions are closely related to the printing quality, especially the printing quality of the newspaper industry. Sometimes the unfavorable factors in the process may even cause catastrophic printing as a result of.

We analyze some easily overlooked problems of silver salt CTP plates from the aspects of storage and use.

1. Problems in the storage of silver salt CTP plates

Generally speaking, the storage conditions of silver salt CTP plates that we often pay attention to are temperature and humidity. The storage temperature is required to be less than 30 ℃ and the humidity is 30% to 70%; the optimal storage temperature is 23 ℃ and the humidity is 50%. The shelf life of silver salt plate materials is usually 36 months. For newspaper printing, due to the large amount of plates used, they can basically be stored and used as required. In addition to the general storage requirements, we should also pay attention to the following issues:

① We usually notice that the temperature and humidity cannot be too high. If the temperature is higher than 30 ℃, the photosensitive performance of the drug film will be greatly reduced. But at the same time, the humidity temperature should not be too low.

If the storage humidity is too low, the PS plate may easily accumulate static electricity. Under the action of static electricity, the PS version is prone to sparks when separated, causing the PS version to partially run out. In addition, due to the adsorption of static electricity, the interleaved paper sticks to the PS plate, and the automatic paper removal device of the CTP fails, resulting in a card plate. What's more, if the interleaf paper enters the processor, the circulation pump of the processor is blocked, and the circulation pump needs to be removed for cleaning. It has caused a lot of time loss. For a practical newspaper, the time loss is huge and irreparable.

In addition, if the storage temperature is too low, the temperature difference between the storage environment and the use environment will be too large, and water vapor will condense on the PS plate, destroying the photosensitive layer, and causing the PS plate material to fail.

â‘¡ When saving the PS version, you must pay attention to the stacking level. Due to the heavy weight of the plates, when the stacks are too much, the shelves where the plates are stacked may sometimes be deformed under the influence of gravity, causing the PS plate at the bottom to be deformed. These plates are often jammed in the plate-making machine during use, causing interruption of production and even damaging the rubber roller of the plate-making machine in severe cases.

â‘¢ The problem of storage location. The use of the PS version in newspaper printing is huge, and there are often multiple batches of PS versions in the warehouse. Be careful when storing. First of all, the PS versions of different batches should be stored separately and marked to avoid confusion and cause the PS version to expire and become invalid. Second, we must pay attention to the stacking order, the new version is inside, the old version is outside. Otherwise, due to the huge weight of the piled PS version, it is a very difficult task to bypass the new version and use the old version.

2. Problems in the use of silver salt CTP version

Silver salt CTP plate is a mature plate material with stable process. But sometimes something unexpected happens.

â‘  The blank part of the printing plate is dirty. In the case of no problem with the quality of the plate material and potion and correct exposure, it is caused by insufficient washing of the plate processor. At this time, we should check whether the nozzles of the water washing part of the processor are blocked. In addition, the aging of the rubber roller and the insufficient pressure between the rubber rollers will cause the above-mentioned situation.

â‘¡The graphic part of the printing plate is not inked. Such problems are highly concealed and often cannot be found during the plate-making process until they are printed on the machine, which will cause a lot of waste of PS plate materials and at the same time, will cause irreparable loss of time for newspaper publishing.

There are multiple factors that can cause such problems. First of all, the current processing machines are automatically and quantitatively replenishing potions. In addition to excluding human factors such as adding the wrong potion, it is necessary to check whether the automatic replenishment of the potion machine's potion is normal, especially pay attention to whether the potion pump of the plate processor is operating normally. Secondly, the silver salt CTP version has a protective layer. If this layer is not cleaned in the plate processor, it will remain on the PS version. It will also cause the printing plate not to be inked when printing. The reason for this is that the nozzle of the washing part of the processor is clogged.

â‘¢ The printing durability of the printing plate decreases. Silver salt CTP version generally has a print durability of around 200,000. Sometimes if the printing durability drops sharply, and the plate is polished in less than tens of thousands of copies, in addition to consideration: whether the rubber roller of the plate processor is clean, whether the potion is normal, whether the status of the printing machine is normal, and whether the fountain solution used in printing is correct Another issue that is not noticed by people is whether the pH of the tap water used in the washing machine is normal. The author once encountered such a problem. In the production, the CTP version's printing resistance dropped sharply, and printing a large number of grinding plates in less than 20,000 or 30,000. Check the status of CTP, printing machine, and printing machine are normal, the potion when printing, the fountain solution during printing are normal. Finally, excluding various factors, it was found that the problem came from the tap water used. Since the reservoir was cleaned on the same day, the pH value was found to exceed the normal range after testing. It is estimated that the cleaning agent was not rinsed out during cleaning. After the property department changed the water in the reservoir, everything was normal.

In summary, after a decade of large-scale use of the silver salt CTP plate, it is already a fairly mature plate. This type of CTP version process is stable, but if we can pay attention to the following points in production, it can still reduce the occurrence of use failures and reduce the waste version rate.

Pay attention to the condition of storing CTP plates, such as proper temperature and humidity, whether the support is flat when stacked, the order of the old and new plates, etc. To strengthen the maintenance of the plate processor, after the plate processor is usually cleaned, it is necessary to carefully check whether the rubber roller is worn, whether the nozzle is smooth, and whether each circulation pump and supplementary pump are operating normally. Strive to find faults in advance, so as not to cause loss of time and benefits.

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