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, cost redundancy and redundant personnel of printing production, and the improvement of work efficiency under the premise of "high quality" "On top, commercial CTP is a method that can simultaneously reduce printing production time, cost and manpower. Looking for a new method to optimize the application of commercial CTP has become a problem for printing companies to solve. Application 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 pre-press through printing and post-press. It is a key technology in the process of printing digitalization such as color management and digital workflow. It is to provide high quality that fully meets the requirements of commercial printing. The basis and premise of the printing plate.
1. Correctly understand the role of commercial CTP
As we all know, the purpose of printing companies adopting commercial CTP technology is not to purchase a batch of advanced hardware and software equipment with CTP as the main body, covering computers, servers, digital proofing, etc., but to integrate traditional printing technology by mastering advanced production equipment and using new knowledge. And processes to enhance corporate competitiveness. therefore. To apply commercial CTP well, preparations must be made in advance, including the establishment of a perfect digital environment, the solution of front-end file system interface technology, the improvement of electronic file management and data storage 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 color separation, tone transfer, digital proofing and spelling of printing production. Matching on key points such as large-format and printing conditions, using CTP in breadth and depth to increase productivity and enhance corporate efficiency.
2. Reasonably construct the control method of commercial CTP application
To apply commercial CTP well, we must integrate all hardware equipment, software tools, and process control in the existing production process with new thinking and new horizons, scientifically analyze and summarize the control nodes of the original process, and understand the performance of each node on product quality and efficiency. Function, so that commercial CTP can truly become a bridge to transfer printed information.
At present, the contents of commercial CTP application control methods mainly include the following four aspects.
(1) Control the accuracy of commercial CTP to transfer printing information, that is, pay attention to, evaluate and select the most suitable CTP and its control parameters according to its own real printing conditions and quality level.
(2) Ensure that CTP accurately provides the best information that needs to be passed during the printing process, that is, based on the analysis of the possible side effects of excessive dot reproduction accuracy on the process, the optimization is different according to the printing conditions and the rule of dot transfer between printed materials Reproduction requirements for dots of type printed products.
(3) Optimize and improve the promotion of traditional processes by commercial CTP technology, that is, to summarize and build a modeled process structure, improve the reliability of commercial CTP applications, and achieve high-precision digital control parameter acquisition, error processing, and settings.
(4) When selecting commercial CTP plate materials according to product requirements, the different characteristics of the commercial printed matter of the enterprise must be fully considered. For commercial prints that emphasize print quality, especially high-gloss, dark-tone dots reproduce fine prints. For exquisite pictures, advertisements, etc., CTP plates with high contrast coefficients and good dot uniformity should be used. For commercial prints that emphasize speed, such as color books or general promotional materials, choose CTP plates with moderate contrast coefficients and uniform dot uniformity.
Method of optimizing commercial CTP application
Starting from the application of commercial CTP, printing companies will directly initiate the process integration of pre-press, printing and post-press processing, that is, on the basis of realizing the direct hoeing of PS and PDF files into printing plates, the process management is realized through the automatic transmission of internal data , Online proofing and PPF / JDF (ClP3 / CIP4) file generation, even allowing customers to specify paper and ink via the Internet, tracking the production status of printed parts, etc. Therefore, the new method of optimizing the application of commercial CTP can be summarized as follows.
1. Establish CTPl version quality control method
At present, China's commercial CTP ownership has entered a stage of rapid growth, but the overall level is far behind developed countries. The reason for this backwardness is that domestic printing companies have insufficient understanding of the digitalization of the printing production process caused by CTP, resulting in the problem of data distortion in the data transfer process and excessive fluctuations in plate quality, and the lack of overall CTP plate production process. Control methods and strategies. The problem of insufficient quality stability of the printing plate is also caused by the inadequate means of over-controlling the quality of the CTP and its printing plate production data, resulting in an excessively high error rate of the printing plate. Therefore, the focus of establishing new methods for optimizing the application of commercial CTP should be focused on establishing a benchmark for overflow design. There are three aspects of setting the processing conditions and testing the output quality of the printing plate. [next]
(1) Establish equipment working benchmark
First, the printing plate and its supporting processing syrup must be selected according to the actual printing conditions and product quality requirements; secondly, the exposure parameters of the commercial CTP equipment should be correctly set according to the printing plate and processing conditions to control the range of exposure fluctuations and establish compensation for laser degradation and environment The solution to the problem of underexposure or overexposure caused by changes is to set exposure parameters in multiple screening modes.
(2) Set the processing conditions
First of all, under the correct exposure conditions or within the allowable exposure fluctuation range, obtain the processing conditions under stable plate quality. Including development temperature, development concentration, development time, brush speed, water washing state, drying temperature, etc .; secondly, establish a control mechanism and management method to ensure the consistency of the washing conditions during the washing cycle.
(3) Check the output quality of the printing plate
First, based on the established commercial CTP equipment working benchmark and processing conditions, establish a method to determine whether the equipment working benchmark drifts: secondly, determine whether the imaging quality of the printing plate meets the printing requirements according to the graphic composition of the printing plate, and determine the processing conditions of the printing plate Whether it matches the exposure, and whether the potion state meets the requirements for processing to stabilize plate quality, etc.
Therefore, the realization of commercial CTP plate quality control requires the establishment of a test plate based on the product characteristics of the printing enterprise, and the optimization and determination of the control parameters of each link according to the changes of various elements in the plate. And integrated into a control mode and management mechanism that meets the requirements of commercial printing, to achieve digital control, programmatic management and simplified evaluation, to ensure the stability and consistency of the dynamic production process of the printing plate.
2. Optimizing control parameters and forming a model operation control
In this paper, Kodak Trendsetter 800… commercial CTP and MercuryT-HD 850 thermal CTPEp plate processor are used as research samples. Kodak positive CTP thermal plate and Kodak Polaroid processing solution are used for control parameter acquisition and operation mode. Attempt to build. All data are collected using a 100x magnifying glass, X-riteDotl plate measuring instrument, and X-Rite528 density meter. The specific process is as follows.
Determine test parameters and indicators
The test parameters and indicators in this paper are selected according to the actual application requirements of commercial CTP, including the determination of the optimal exposure parameters of commercial CTP, the optimization of printing plate processing control parameters, the dynamic test of the printing plate status, and the actual printing test.
In the determination of the optimal exposure parameters of commercial CTP, it is mainly to test the control parameters of the commercial CTP optical system, such as the focusing ability, laser energy and drum speed. These parameters are completed using a combination of segmented exposures, and the data such as dots, density, and microwire resolution status of the measurement bar are measured by the instrument. The test data and its processing results are shown in Figure 2 and Figure 3.
In the combination test of the main benchmark parameters of commercial CTP equipment. In this paper, a comparison experiment of light energy and speed on the dot area and density of the printing plate was carried out with 2400dpi output. It can be seen that when the dot area and density are the minimum, the quality of the printing plate is the best.
(3) According to the product structure, establish a model operation control
In view of the current status of printing companies entering the era of low profit, the application of commercial CTP to printing companies is to bring quality improvement, time reduction and benefit enhancement to enterprises. Maintain technical continuity and innovation, and maximize the technical differences with similar companies. Therefore, commercial CTP must form a model of job control according to the product structure.
The author's comprehensive evaluation of commercial CTP in recent years has obtained the following conclusion: For non-premium commercial prints, the same paper, ink and printing equipment are used under the condition of 20 FM network or l75 ～ 200dpi power port network. The printing quality is basically the same or the visual effect is basically the same. The same job control mode can be used. In terms of processing conditions, the thermal CTP version is more tolerant than the photosensitive CTP version. As long as the control method obtained by the above method is used for processing, the printing plate repeatability can be guaranteed to be higher than 99.9% In terms of printing power, the purple laser CTP version has better printing durability than the thermal CTP version, and is more suitable for printing long jobs. The purple laser CTP has better adaptability to the printing plate, while the thermal CTP has more restrictions.
in conclusion
The purpose of introducing commercial CTP for printing companies is to use 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 the optimization of commercial CTP application methods, which provides a practical and effective means for optimizing the application of commercial CTP and can help Printing companies can break through many bottlenecks of CTP application in the most reasonable way, which has a good guiding role and application value for accelerating the work efficiency of commercial CTP and simplifying the control link.
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