In the development of economic globalization, the core competitiveness of printing enterprises is focusing on how to optimize and apply new technologies and new methods to reduce the time redundancy of printing production, cost redundancy and redundant personnel, and the reality is to improve the work efficiency under the premise of high quality. "Top, commercial CTP is a means to reduce printing production time, cost and manpower at the same time. Finding new ways to optimize commercial CTP applications has become a problem for printing companies. After long-term technical research and work practice, I believe that optimizing commercial CTP Applications should start from the following aspects.
Scientific analysis of the advantages of commercial CTP
　　 Commercial CTP is a new production mode that integrates the entire production process from prepress to printing and postpress. It is the key technology to realize color management and digital workflow in the process of digital printing. It is to provide high quality to meet commercial printing requirements. The basis and premise of the plate.
　　 1 . Correct understanding of the role of commercial CTP
　　 As we all know, the purpose of using commercial CTP technology in printing enterprises is not to concentrate on purchasing a batch of advanced hardware and software equipments with CTP as the main body, including computers, servers, digital proofing, etc., but to integrate traditional printing technology by mastering advanced production equipment and using new knowledge. And process to enhance the competitiveness of enterprises. therefore. To apply commercial CTP, you must prepare in advance, including the creation of a complete digital environment, the solution of front-end file system interface technology, the improvement of electronic file management and data preservation and retrieval technology, the optimization of color management and RIP technology, Staff training, etc. Only by comprehensively and systematically analyzing the traditional printing process, and acquiring new knowledge of CTP and related technologies at a certain cost, can we take advantage of the new technology and realize the printing production in color separation, tone transfer, digital proofing, and spelling. Matching key points such as large format and printing conditions , using CTP in breadth and depth to increase productivity and improve business efficiency.
　　 2 . Reasonable construction of control methods for commercial CTP applications
　　 Applying commercial CTP, we must integrate all the hardware devices, software tools and process control in the existing production process with new thinking and new vision. Scientifically analyze and summarize the various control nodes of the original process, and understand the quality and efficiency of each node's production. The role of commercial CTP can truly become a bridge to convey printed information.
At present, the content of the commercial CTP application control method mainly includes the following four aspects.
　　 (1) Control the accuracy of commercial CTP to deliver printed information, that is, to focus on, evaluate and select the most appropriate CTP and its control parameters according to its actual printing conditions and quality level.
　　 (2) Ensure that CTP accurately provides the best information that needs to be transmitted during the printing process, that is, based on the analysis of the side effects that the reproduction accuracy of the high dot can cause on the process, optimize the difference according to the printing conditions and the dot transfer law between the printed materials. Dot reproduction requirements for type prints.
(3) Optimize and improve the commercial CTP technology to improve the traditional process, that is, to summarize and construct the model structure, improve the reliability of commercial CTP applications, and achieve high-precision digital control parameter acquisition, error processing and setting.
　　 (4) When selecting commercial CTP plates according to product requirements, the different characteristics of the company's commercial prints must be fully considered. For commercial prints that emphasize print quality, especially high-gloss, dark-tone dots reproduce fine prints. As beautiful pictures, advertising, etc., should adopt the large gamma, outlets and good uniformity emphasis on speed CTP plate for commercial printing products, such as color books or general promotional materials, select gamma and dot uniformity moderate CTP plate .
Ways to optimize commercial CTP applications
Printing companies from the application of commercial CTP, will directly lead to the integration of pre-press, printing, post-press processing, that is, on the basis of the realization of PS, PDF files directly into the printing plate, through the automatic transmission of internal data to achieve process management Online proofing and PPF/JDF (ClP3/CIP4) file generation can even allow customers to specify paper and ink through the Internet, track the production status of the print, and so on. Therefore, new methods for optimizing commercial CTP applications can be summarized as follows.
　　 1 . Establish CTPl version quality control method
　　 At present, the possession of commercial CTP in China has entered a stage of rapid growth, but the overall level is far behind the developed countries. The reason for this backwardness is that domestic printing companies have insufficient understanding of the digitalization of printing production processes caused by CTP, resulting in data distortion in the data transmission process and excessive fluctuations in printing plate quality, and lack of overall processing of the CTP printing process. Control methods and strategies. The problem of insufficient quality stability of the printing plate, as well as the problem that the quality of the CTP and its printing plate production data is lagging behind and the printing plate error rate is too high. Therefore, the focus of establishing a new method for optimizing commercial CTP applications should focus on establishing a working benchmark for overflow. Set the punching conditions and detect the three aspects of the plate output quality. [next]
(1) Establish equipment working standards
First, the printing plate and its supporting rinsing syrup must be selected according to the actual printing conditions and product quality requirements. Secondly, the exposure parameters of the commercial CTP equipment are correctly set according to the printing plate and the rinsing condition, and the exposure fluctuation range is controlled to establish the compensation laser degradation and environment. A solution that causes changes in underexposure or overdose, setting exposure parameters in multiple screening modes .
　　 (2) Set the punching conditions
The rinsing conditions for stable plate quality should first be obtained under the correct exposure conditions or within the allowable exposure fluctuation range. Including development temperature, development concentration, development time, brush speed, water washing state, drying temperature, etc.; secondly, establishing a control mechanism and management method for ensuring the consistency of the flushing conditions in the flushing cycle. Â Â
(3) Detecting the output quality of the plate
　　 Firstly, based on the established commercial CTP equipment working benchmark and rushing conditions, a method for judging whether the equipment working standard is drifted should be established: secondly, according to the composition of the printing plate, it is judged whether the printing image quality meets the printing requirements, and the printing plate washing condition is judged. Whether it matches the exposure, whether the syrup status satisfies the flushing requirements for stabilizing the plate quality.
Therefore, the realization of commercial CTP plate quality control needs to establish a test standard according to the characteristics of the printing enterprise, and optimize and determine the control parameters of each link according to the changes of various elements in the standard. It is integrated into a control mode and management mechanism that meets the requirements of commercial printing, and realizes digital control, program management and simplification evaluation to ensure the stability and consistency of the dynamic production process of the printing plate .
　　 2 . Optimize control parameters to form a patterned job control
　　 This article uses Kodak Trendsetter 800... commercial CTP and MercuryT-HD 850 thermal CTPEp plate processor as the research sample, using Kodak positive CTP thermal plate and] Kodak Polaroid solution for control parameter acquisition and operation mode. The attempt to build. All data were collected using a 100x magnifying glass, X-riteDotl plate measuring instrument, and X-Rite 528 densitometer. The specific process is as follows.
Determine test parameters and metrics
The test parameters and indicators in this paper are selected according to the practical application requirements of commercial CTP, including commercial CTP optimal exposure parameter measurement, plate flushing control parameter optimization, plate state dynamic test and actual printing test.
In the measurement of the optimal exposure parameters of commercial CTP, the control parameters such as the focusing ability, laser energy and drum speed of the commercial CTP optical system are mainly tested. These parameters are completed by a combination of segmentation exposure, and the instrument measures the data of the dot, density and microwire resolution state of the strip. The test data and its processing results are shown in Figure 2 and Figure 3.
　　 In the combined testing of the main benchmark parameters of commercial CTP equipment. In this paper, the comparison of light energy and rotational speed on the dot area and density of the printing plate is carried out at 2400 dpi output. It can be seen that when the dot area and density are both minimum, the plate quality is the best.
　　 (3) Establishing modelled job control based on product structure
　　 In view of the current status of printing companies entering the era of low profit, printing enterprises applying commercial CTP is to bring quality improvement, time reduction and efficiency improvement to enterprises. Maintain technical continuity and innovation to maintain maximum technological differentiation from similar companies. Therefore, commercial CTP must form a modeled job control based on product structure.
　　 The author's comprehensive evaluation of commercial CTP in recent years has obtained the following conclusions: For non-premium commercial prints, the same paper, ink and printing equipment are used under 20 FM or l75～200dpi network. The printing quality is basically the same or the visual effect is basically the same. The same operation control mode can be adopted. In terms of the stencil condition, the thermal CTP version is more versatile than the photosensitive CTP version. As long as the control method obtained by the above method is used for printing, the plate repeatability can be ensured to be higher than 99.9%; In terms of printing force, the violet laser CTP version has better printing durability than the thermal CTP version, and is more suitable for printing long-length jobs, and the violet laser CTP has better adaptability to the printing plate, while the thermal CTP has more restrictions.
in conclusion
　　 The purpose of the introduction of commercial CTP by printing companies is to rely on advanced CTP technology, which requires quality, time and efficiency. This paper establishes a set of scientific, objective and systematic CTP equipment and plate control methods through optimization of commercial CTP application methods, which provides a practical and effective means for optimizing the application of commercial CTP. Printing companies have the most reasonable breakthroughs in many bottlenecks of CTP applications, and have a good guiding role and application value for accelerating the improvement of business CTP performance and simplifying control.
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