CTP: Discussion on the Problem of Wired Images (II)

(3) The influence of complex images: The influence of this situation is similar to that of the channel, because the bitmaps of the images processed in photoshop are different from those of the bitmap software (especially in Coredraw). In software, bitmap parsing is different from Photoshopd's, and it is often interpreted as a problem when outputting to PDF format. To solve this situation, the image is converted into tiff format again in the drafting software, and the problem can be solved.

(4) Impact of RIP Motherboard: In this case, the data transmission is normal without any prompts of the machine and software control. After the exposure is completed, the image is found to be in disorder and the effect after the development is shown in the figure:

Excluding the reasons for the laser head exposure scan deviation and the above-mentioned three reasons, after testing (replace the new data cable and motherboard) only to find that the motherboard is a problem, only the motherboard can be replaced.

hardware problem:

(1) Streaks resulting from static electricity: This situation is rare and can occur only when manual loading is performed. Due to the high opening frequency of the lid for the plate, the machine will run for a long time, the body will generate high voltage static electricity, and there will be a high potential difference between the edge of the lid and the edge of the stage. When the lid input version is dropped, the aluminum base plate The material will act as a conductive medium and instantaneous current will create lines on the plate, which will seriously damage the image. The solution to this problem is to add an anti-static soft gel on the edge of the lid. At the same time, the machine is often subjected to electrostatic treatment.

(2), machine scratches: This situation is not easy to find the reason. At the beginning of this situation, it took great pains to consider all the paths of the plate in the machine, and also asked the manufacturer's engineers to come to the direction. The problem has not been solved. After many experimental observations, it was a small guide. Scratches caused by rubber wheels and tail plates. Because the thickness of the plate base is about 0.3mm, the elastic force is relatively large. When the plate is attached to the platen roller, the rear part will have a large elastic force to hit the rubber wheel and the platen clip, resulting in the generation of a line at the end of the image. ) If there is a scratch across the entire image information, it is due to the dirt on the roller in the plate path. The former solution is not only to replace related parts and components but also to reprocess the parts (which is difficult to implement). In the process of entering the plate, the upper cover can be opened and the guide plate can be pressed by hand (with cotton operating gloves). Keep the plate in contact with the guide roller and the platen. The latter causes the corresponding roller to be cleaned and maintained.

(3) Development Problems: After eliminating the above reasons, if there are any lines, it is necessary to consider the problem of development. For the heat-sensitive positive plate, a new plate (without exposure) can be used to detect the development effect by the developing machine to find the scratched position; and the heat-sensitive negative plate plate must be made a solid image, after exposure, Develop to find the problem.

In short, the CTP plate scratch problem is a rule to follow, only through careful analysis, repeated testing, you can find a solution to the problem, in particular to remind you to do software and CTP software color management and interpretation of the company's different operations The staff must observe more of the published version of the situation, make more summaries, try to find and solve problems as much as possible, and improve the technology.

Source: Shanghai Packaging