Quality Control And Measuring Of Thermal CTP In Plate-making Process

Thermal CTP is a new plate-making process, which has a very important meaning in morden printing industry, there are some problems in the application process such as short of funding for most of our printing enterprise, low level of pre-press staff, lack of understanding for digital process, quality control and detection system are not perfect and so on. In order to change the current situation, improve plate speed and quality, the author put forward the promotion of the relatively low cost of domestic CTP, equipment and focus on the training of pre-press plate-making technology and process, which will establish perfect quality control method and detection system.Firstly, this paper analysis the basic elements of thermal CTP plate process, which including plate-making equipment, plate-making materials, plate-making environment, plate-making staff work quality and the digital process, as well as every plate factor and plate quality effect. Secondly, by applying exposure experiment, developing detection, pre-press detection, the author has summed up the related data such as exposure parameters, developing temperature, developing density, developing time, brush speed, washing, drying temperature on the quality of state influence; Finally, pass the output test plate experiment and the experiment of conventional printing plate with control tape, using a color density instrument, test its coverage rate and mask retention rate, using a microscope detect dot shape, with medical alcohol cotton swab test plate bottom ash residue. Constantly update exposure parameters and developing parameters, decide a suitable experimental parameter table and determine a printing plate linear curve. And then the obtained four-color printing machine printing, checking printing on the dot coverage, leaving membrane and the rate of dot shape, recording the detected data to determine the linear curve. Finally, get the test data based on the test above, export a conventional plate with control tape and then test, verify the printing plate linearization. After printing, observe the network coverage of printing control tape, prove the printed linear curve applicable to conventional plate again.The innovation of the paper through using graphics software Coredraw to design a novel test and control strip.Control strip include line area, wedges, District Board District, District of resolution, the chief prunar three section type signal and Star area six parts,The fourth part which is detected to a plate dot transfer status, after the two parts is the detection process of printing dot reduction,Can achieve real-time monitoring of the entire plate making and printing process network reduction;Optimization of plate linear curve and printing compensation curve, and network quality reduction;In view of domestic equipment and materials research, experimental method is applicable to most domestic thermal CTP equipment, the output plate is also used in domestic and imported printing equipment and paper, improve quality, reduce the plate waste, saving money, enterprises can provide a theoretical support.Through the domestic made test plate and control tape experiment, we can monitor the changing of various elements on printing plate, and according to the change of value optimize and determine all aspects of the control parameters, integrate the printing requirements control mode and management mechanism, achieve the digital control, procedure control and standardized evaluation, ensure that the plate dynamics production process stability and consistency.