This article is a special speech made by Mr. Jin Jin, deputy director of the production and operation department of the People's Liberation Army newspaper, on the quality and management of printing at the 2006 National Press Printing Quality Review Conference. The following article is about the use of Agfa by the printing plant: Advantage CTP System skills and experience.

The imaging of the CTP equipment on the CTP plate is similar to the imaging of the laser imagesetter that we usually use. The CTP version it uses is a negative CTP version. Just like the photosensitive film produced by the laser imagesetter, the magnitude of the light value power directly affects the quality of the graphic part of the CTP version. Especially after the linear determination of the emission curve of the CTP device, because the CTP device completely reproduces the dots on the CTP version according to the set curve, it is difficult to judge whether the sensitivity of the graphic part on the CTP version is sufficient with the naked eye. Therefore, at this time, if the light intensity of the CTP device is not enough, it is more likely to cause artifacts. On the CTP plate made under this condition, the image formed by the graphic part is not strong enough, and it is very easy to cause shedding on the machine printing, which makes the work passive.

The CTP printing plate produced by the CTP equipment, whether the quality of the image and text after its imaging meets the standard, it is difficult for us to check with a simple instrument. In other words, this phenomenon can only be avoided by choosing the correct light intensity. So how can we avoid the problem of insufficient sensitivity of the CTP plate caused by too low laser power and insufficient light intensity? Now we will introduce our approach to everyone for your discussion and exchange.

First set a test flat screen with a half point value of 50% to fully expose the CTP version. If the value of the flat screen on the CTP version is 62%, it means that the laser light value at this time is suitable, if it is less than 62 %, Then adjust the laser power (increase) until the flat screen value on the outgoing CTP version reaches 62%. After the light value is determined, 62% of the dots are corrected by adjusting the linearity method-still 50%. In this way, the optical value and linearity of the CTP equipment basically meet the requirements.

Under normal circumstances, the initial optimal technical value of CTP equipment is completed by the after-sales service personnel of the machine. As a general plate-making technician, in the usual daily maintenance work, especially in the initial use stage of the new machine to the factory, because the technical indexes and characteristics of the machine itself are not perfect and comprehensive, this work should still be done Under the guidance and cooperation of the after-sales service technicians of the aircraft.

Link: The PLA Press Printing Factory is one of the most influential newspaper printing plants in the country. In addition to the "PLA News", it also prints the "China Defense News", "China Television", "Beijing Times", "Beijing Evening News", "Yangcheng Evening News", etc., as well as more than 80 newspapers and periodicals from the central, national ministries, military and local governments. In the two evaluations of newspaper printing quality in 2006, the "PLA" was rated as a top-quality newspaper.

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