There are also limitations in implementation. According to the agreement of the editorial department of the Ministry of Commerce, I would like to introduce the experience of using some plates (PS plates). Taking into account the use of plates and related equipment, process technology, and environmental conditions are complementary and should be matched to solve, so the problems in the printing process will be discussed together. At present, the majority of the use of the positive version of the PS version in China accounts for the majority, so the use of the positive PS version is highlighted.
First, make preparations before printing
The modern management theory emphasizes prevention as its priority, emphasizing pre-implementation and process management, implementation specifications and documented management. Therefore, relevant process documents must be prepared before the printing, maintenance of their equipment, preparation of materials for their use to test, regulate the plant environment, training its operators, and carefully implement the preparation document.
1. Original quality check. The original quality is the basis for printing quality and print quality. General problems in the original edition are all principled. The light affects the quality of the batch of products, and the severe ones cause the entire product to be wasted. Therefore, the original version is required to check the specification size and the customer's requirements (standard requirements on the process card); Position registration checks whether the dimensions of a set are the same and whether it meets the printing requirements; if there is an image, the position of the image must be accurate, the color tone is the same (such as flat screen), and the angle is correct; the position of the image, pattern, and text is accurate; the original must be Anti-yang map (positive plan type printing requirements); layout clean, clear images, text can not be lack of strokes; the contents of the copy can not be omitted; dot density should be uniform enough. According to the requirements of CY/T30-1999 "Offset Printing Plate Production" 4.1, the transmission density of the center of the dot network should be higher than 2.5; the transmission density of the blank portion is not higher than 0.15, preferably not higher than 0.10; the width of the dot edge (virtual edge) cannot be More than 1/40 of the width of the cable; under the premise of sufficient illumination, observe with the specified magnifying glass (12 to 15 times), the dot cannot have obvious cracking, can not see the scan line; the density of the field should be 3.5, if scanned The light value and development conditions are in line with the currently used film, the field density can be maintained at 4.0; the more uniform the original image and text density, the higher the better, the lower the density of the blank parts, the smaller the virtual point of the network point the better; hope that the network point is rigid The soft-sites are more difficult to control and operate the printing plate (see Figure 1). The original version is best full-page imposition output full-page, if you need to make imposition, the tape should be kept with the appropriate distance (more than 3mm), the tape must not enter the text, and the tape should be flat and secure. There is overlap.
2. Plate preparation. The quality of the plate is guaranteed
According to the definition of GB9851 printing technology, â€œShaiban is the process of transferring the information of negative or positive film to printing plate or other photosensitive material by contact exposure methodâ€. From the definition, the printing plate involves related equipment, materials, environment, process technology, operation skills and management. The printing equipment is updated, replaced or replaced by new materials, materials in replacement or innovation, software in innovation or upgrades, processes in reform or compatibility. The advancement of these technologies brings printing operations that are documented, programmed, digitized, standardized, and networked. . Prepress text typesetting, image color separation, screening, creativity and graphic edition, and output are softwareized; printing presses, especially imported printing presses, have mostly program-controlled quality systems and printing plate reading systems. , Register control or automatic register systems, related management systems, etc. These devices lay a solid foundation for the implementation of plate-making (excluding printing) and procedural operations of printing under the normative documents or software instructions. Shaiban is the bridge between platemaking and printing, and plays a role in linking up and down. Under the premise of meeting the requirements of plate making, the process technology and operation level of the printing plate directly affect the quality of printing plates and printed materials, so it is necessary to strengthen and pay attention to drying. Edition work.
At present, China's printing companies have made rapid advancement in the equipment, materials, and technology of the prepress and printing sectors. There are also significant developments in the printing and printing bridges, but there are significant imbalances in the printing conditions.
4. Training of relevant teams. The knowledge involved in copy-printing is very broad. Before the employees go to work, they must follow the principles of knowledge, the skills of the meeting, the standards that should be understood, the standards applied, and the ethics that should be respected. They should be certified. Clearly define their respective tasks, implement post responsibilities, improve their knowledge and skills, and improve their dedication and sense of responsibility. This is a necessary guarantee for doing a good job of printing.
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