Several solutions to the problem of printing plate grime

Printing plate grime is a common problem in the printing process. Policies and regulations plague many printing companies. Moreover, because of its various reasons, the processing methods are not the same. If the method is not properly selected, it will also damage the printing plate Huaguang Precision, which will bring huge losses to the printing company. For this reason, the printing industry constantly explores and analyzes in practice and puts forward many effective solutions. Since the beginning of the 8th "Printing Technology" National Prized Essay Contest, the editorial department of "Printing Technology" has received a lot of relevant articles, and one of them is now selected to be shared with readers. At the same time, we also warmly welcome more readers to participate in this event and share your experience and experience with us.

For a long time, printing plates have always been a very vexing problem. Many printing companies set up special personnel to inspect the printing plate stains in the printing section, but it is still inevitable that there are omissions. Therefore, after the printing and packaging city and printing plates are on the machine, the printing staff will also conduct another inspection. For general smears, they often use modified paste for processing, however, due to the different reasons for the formation of the dirty tracks, the different locations appear, some of the dirty tracks can not be simply removed with a revised version of the paste, but also need another Think of some solutions to solve. For this reason, based on my long-term practical experience, the author summarized the following methods for handling the printing plate grime: CTP in China for your reference.

Needle stroke

When the plate is dirty, it can't be processed directly with the revised paste. Use the needle-stroke method. Use the sewing needle to gently wipe off the stain by dot angle, and then apply some plate solution. . Manroland

Knife scraping

After the baking and aging treatment, all the big stains and long lines outside the image cannot be removed with the revised paste. At this time, you can use the utility knife to gently grind the plate. Scrap a few times back and forth, and then wipe some cleaning solution.

Manual local development labeling

The clear glue that is left on the film when it is put on the rinsing mouth, hanging nails, and sticking the color mark is transferred to the top of the printing plate after being exposed to heat. The photosensitive film on the printing plate is stuck due to the glue and cannot be developed. Plates are dirty. This kind of dirty mark is not solid, and it is scattered. If the dirty mark is packaged in the blank space, it can be repaired with a revised paste. If it is in the graphic, you must use a sponge to pick up some developer and gently wipe it. Then Quickly wash off with water.

Soap scrubbing

There is a very special kind of dirty traces. Generally, a series of radial-dirt offsets will appear shortly after printing on the machine. The above-mentioned various revision methods cannot be handled cleanly. For some time, my company's printing plate also had this kind of problem, and it lasted for several months, damaging hundreds of plates. After our hard research and analysis, we found the real cause/organization. The original problem was in the developing brush wheel. After the brush is used for a long time, there will be some irregular wear. When developing, the photosensitive layer of the printing plate can not be in close contact with the brush. Therefore, the ink balance, the developer only works on the surface of the printing plate, and the role of the inner layer is not Thorough, resulting in the printing plate on the machine for a period of time, there will be intermittent stains appear. In response to this situation, we used a soap-scrubbing method and the effect was very good. This is mainly because soap is a weakly alkaline substance and is often used to clean printing plates to make up for the lack of development. It does not harm the printing plates and graphics. The situation that this company generates is a kind of underdeveloped one. Of course, if the film is covered, this problem should be solved. In the end, the worn-out brush wheel should be replaced, so that the dirty track will no longer appear. X-Rite

It can be seen that the problem of the dirt on the printing plate cannot be solved with the revised paste. It must be good at distinguishing and analyzing packaging and decoration. It is good at solving problems with simple and effective methods to save time, effort, and money. best effect. Evaluation