Pre-printing error printing remedy
Solutions for printing quality problems caused by prepress plate making mistakes Once, due to the sporadic film provided by the customer, the output was set incorrectly so that the direction of the film was upward, and the imposition personnel did not carefully examine and correctly identify the direction of the film. After the artificial imposition, the film was delivered to the next process. In this way, due to the lack of quality control experience of the operator, after the four-color printing of semi-finished products, the printed dot color of 20% of the blue flat screen surface is obviously pale, and the entire printed sheet is obviously lacking in comparison with the original. When semi-finished products are tested, they are judged as non-conforming products. After careful analysis of the printed semi-finished products, a remedial solution was developed. The specific approach is: The field lines and text layout in the printing plate will be repaired with the revised solution, leaving only 20% of the flat screen printing machine to register and printing again. This way, the C color will be printed after a partial layout The semi-finished product, the overall layout of the printing color that is close to the original, remedial solutions to obtain a successful process effect, the quality of the product has been recognized by customers, to avoid economic losses. Technical Analysis of Print Quality Problems Caused by Misdirection of Film Film The above-mentioned printing quality problems caused by the misdirection of the film of the film have exposed the outstanding problems from the prepress production to several printing processes. The first is that the electronic output production staff is not working enough or is not well aware of the exposure process, and there is a certain degree of blindness in the production of flat screens. Second, there are errors in the way the imposition personnel check the film, and it is often used when making impositions. To simply determine the film surface of the film (that is, the direction of the film in general) by simply referring to the text direction of the layout; third, the printing process did not promptly check and find the film error; fourth, the printing process was adjusting the amount of ink. At the time of satisfying the fact that the field lines and text layout were saturated with ink, the plates were not dirty, and the color of the flat screen surface was still pale, the quality of the plates was inspected and recognized, resulting in blind printing. The above-mentioned print quality problems occur. The correct understanding of the composition of film The general film film is composed of a film base and a photosensitive film, wherein a transparent film base is used to support the photosensitive film, and the photosensitive film is a chemical emulsion coating layer composed of some photosensitive crystal particles. . The film on the film can only see its particles under the microscope. The imaging principle of film is that the crystal particles on the film will change its structure after being exposed to light and combine with other crystals to form a block. The more light is projected on the film film, the more crystals change and the blocks become more. Therefore, different lights shining on the film will produce crystals of different numbers and sizes and shapes, thus forming an image that has not yet been seen, and the development of the film can transform the latent images on the film into stereotypes. Visible image. The production process shows that the density of the film on the film is higher on the photosensitive part, and the density of the film on the less sensitive part of the image is small, while the part without the light is completely transparent. Generally, the development time of the film is long, and the film of the film is correspondingly thick. On the contrary, the film of the film is thin, which is the basic feature of the film production process. Film film direction identification method For the prepress production and inspection personnel, identifying the orientation of the film is the basic skill that must be mastered. Only by doing a good job can they effectively reduce or avoid mistakes in work and ensure the quality of production. The identification methods of film on the production site generally include: manual scraping film identification method and naked eye observation and identification method. The artificial scraping film to identify the film surface of the film is to use a blade to scrape the film on the film except for the finished printed product. If the scraped film is damaged, a light transmission phenomenon occurs at the scratch, indicating that the surface is the film surface. The method of visual observation and identification is that the film surface of the film is relatively dark, while the film surface (base surface) is relatively bright, with a clear mirror effect. If the film is identified by the same reticulated version, when the film is observed visually by the film, the film has a dark feeling, and the density of the dot is relatively large. When the film is face-down inspection, the film is felt. Films are bright and glossy, and dot density is also small. Film spot size identification method If the sun-dried version of the screen, the film surface of the film is not in direct contact with the surface of the printing plate, and the dots of the dried fabric will appear smaller phenomenon, affecting the reproduction quality of the product. Therefore, the printing and printing staff must learn to identify the commonly used dots with the naked eye. In this way, if the film surface of the film is incorrectly used during printing, the printing plate dot becomes significantly smaller, and by checking the printing plate or printing sample sheet, it is possible to find the error of the printing plate. In general, 1 to 10% of the dots are commonly used, and they are also easily visually recognizable. The identification of the number of points within 50% of the points within the network is based on the number of particles that can accommodate the same point in the space between the two sides of the edge. That is, within the gap between the two outlets on the opposite side, three equal-sized outlets can be placed, which is a 10% outlet; if within a distance between two outlets, two equally large outlets can be accommodated, which is called 2 In the distance between two outlets, it can accommodate 1.5 equally large outlets, called 30% outlets; if two outlets can accommodate 1.25 same-sized outlets, it is called 40%. Network points; if the two outlets can accommodate one and the same size of outlets, that is to say, the printing outlets and white spots in each unit area account for half of the total, that is, 50% outlets. And 50% of the Internet sites are judged by the number of white spots that can hold the same size between the two white spots. From the point of view of the regularity of the number of dots, the number of dots contained within the spacing of two white dots is exactly the same as that of 40%; 70% is the same as 30%; 80% is the same as 20%; 90% is the same as 10% . 10% is the field version. If the layout is a field version, there will be no oblique light transmission due to no dot gap. Therefore, the field version of the film film upwards will not affect the density of the field layout. . Therefore, correctly understanding the characteristics of the film and the factors affecting the quality of the printing plate reproduction, and carefully relating the film output, printing process, and quality inspection control technology, can not only reduce or avoid the occurrence of prepress process quality problems, but also better. Guarantee the printing quality of the product. leather corner sofa,Corner Sofas,large corner sofa,corner chaise sofa Guangzhou LoPhiDa Co.Ltd , https://www.widinlsamachine.com