The replacement frequency of the CTP output system is accelerating, causing many operators not to be proficient in the operation technology of the CTP output system, so that they cannot make better use of the production capacity of new equipment. In order to solve the above problems, the author briefly summarizes the environmental requirements, parameter settings, joint problems, and solutions of the CTP output system, so that operators can adapt to the new equipment more quickly.
Maintaining a suitable environment is the foundation
1. The surrounding environment has a certain influence on the CTP output system, such as temperature changes, air humidity, and dust content in the air. Temperature change is the natural enemy of equipment. Optical path systems in equipment such as drum scanners, imagesetters, and CTP direct-to-plate-setters are prone to water mist generated by temperature changes, which affects imaging. Different equipment has different temperature requirements. So the temperature of the CTP system must be kept within the standard range. the
2. Humidity reflects the moisture content in the air. If the moisture content is too high, the machine's surface is prone to embroidering over time, and it is difficult to maintain, resulting in the unstable linearization of the output of the CTP plate. However, if the moisture content is lower than 40%, the operation of the machine will easily generate static electricity. Therefore, industrial humidifiers and dehumidifiers are generally used to adjust the humidity. The humidity should be controlled between 40% and 60%. the
3. Excessive dust can easily damage computers and plate-making equipment. For example, dust can easily accumulate on circuit boards and air inlets of electrical equipment. Affected by external temperature and humidity, it may instantly become a conductor and cause a short circuit on the circuit board. Laser phototypesetting machines and CTP plate-making machines have high requirements for the dust content of the environment. Dust on the optical path lens and dust particles falling on the inner drum will affect the plate-making quality. Therefore, it is very important to keep the ground clean, prevent the invasion of foreign dust, regularly remove dust from electronic equipment, and ensure that all equipment is maintained daily. the
Setting the correct parameters is the key
Different plate materials use other setting parameters, so it is necessary to set corresponding parameters according to different plate types. Take Fuji plates, Agfa plates, and Founder Diaolong 8600CTP plate-making machines as examples. Fuji plates require that the energy parameters of the CTP plate-making machine be selected as 50, the developing temperature is 28°C, the developing time is 26 seconds, the preheating temperature is 90°C-104°C, and the replenishment amount of developing is 80ml; Agfa plate energy setting parameters Choose 32, the developing temperature is 24°C, the developing time is 26 seconds, the preheating temperature is 104°C-127°C, the amount of developing replenishment is 80ml, the baking temperature of the two plates is about 260°C (actual temperature), the baking plate The time is 3-5 minutes, and the plate material is not deformed as the standard.
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In the process of using the specific CTP plate, the following points should be paid attention to: the use and storage conditions of the CTP plate are 20°C-25°C, and the humidity is 40%-60%. Because the photosensitive CTP plate is sensitive to temperature and humidity, it must be paid attention to the high temperature and high humidity environment in summer; the use period of the developer is 3 weeks to one month, replace the developer while cleaning the developing machine and replace the developer filter at the same time; check the circulation of the developer regularly, the pH value fluctuation range of the developer is 11.75- Between 12.25; Before outputting the CTP version, carefully check the hanging network parameter settings, such as the number of hanging network lines, output resolution, appropriate linearization selection, corresponding printing reverse compensation, etc.; regularly use the printing plate detector to check the test strips of the output CTP plate , to see if the output linearity exceeds the error range, and adjust it in time if it exceeds.
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