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Film quality problems can be divided into two categories based on their properties. The first type is the quality of the film material itself and the quality problems that arise during photocopying and developing and rinsing. The quality indicators specified in the printing standards are formulated for such quality problems; the second type is logical quality errors. Mainly refers to the graphic content error on the film.
1 Factors Affecting Quality of Film Materials and Their Making
(1) The quality of the film itself. The imported film is sharp, clear, strong, and stable; the domestic film film is thick and easy to stick, the base film has large fog, is sensitive to the environment, and can easily carry dirty, dirty lines, scratches, etc. Sexual defects.
(2) Factors affecting the output device
Imagesetters are divided into three types: inner drum, outer drum, and winch. If the four- or more-way laser modulation of the drum-type imagesetter is not uniform, the image portion of the film may form a severe oblique bar-like pattern when imaging. The filming structure of capstan photosetter has a great influence on the accuracy of the film. The error of the imaging frame is vertical stretching, transverse parallelism or arc linear movement. It is generally negligible under monochrome printing conditions; Wear, uneven pressure, can not be uniform speed pieces, sometimes leading to wrinkling of the film due to graphic deformity, or the formation of longitudinal layout compression, in the compression of the image can be distinguished on the fine black lines, this problem is more difficult to find. In comparison, the inner drum imagesetter is more trustworthy, but it should be noted that long-term cuts may have small pieces of film that slide down to the bottom of the drum. When the film is removed, it will be scooped to the area to be exposed, resulting in partial non-imaging. This is similar to the effect caused by the inaccurate grouping operation and the white line or white background left on the graphics layer. The quality of the film is also difficult to distinguish.
The imagesetter's laser is weak, or the optical system's mirror dust, will reduce the density of the field; if the laser is too strong, it will make the text strokes fuzzy and heavy, and the image network points will be adjusted. Our experience is that the field density of the film can be adapted to newspaper printing requirements from 2.5 to 4.5.
When the imagesetter runs for a long time, the laser power drops, or the grating absorbs fine dust, which causes the synchronization signal to be out of balance and sometimes causes misalignment of the film layout. Some very regular misplacements are also easily missed.
(3) Influencing factors of punching machine
1 poor sealing of the darkroom, resulting in excessive fog or exposure of the base;
2 The liquid circulation pump does not work, and the temperature difference between the two sides of the bath is relatively large, resulting in a dark and light film density. Poor transmission mechanism caused fold creases;
3 The temperature of the liquid is insufficient or the drug power is insufficient to cause the film to have fogging, the density in the field is reduced, the development temperature is too high to cause ghosting, and the developer is mixed in the fixing solution to make the film base yellow, and the film is not fully dried to make the film stick.
4 The cleaning is not complete and the film is dirty. Wiping off with a damp cloth is usually done with a sticky scale in the water roller. There are black dirt spots that cannot be removed. The developing roller must be cleaned, yellow-white dots can be wiped off with fixing water, and the fixing roller may have more crystallization.
2 Factors leading to errors in the logical content of the film
(1) There is an error in the content of the picture itself in the distribution file.
1 The file formed by the local group edition, pay attention to the specification file name and storage path, and ensure the consistency and consistency of the operation of the file; after the layout image is reprocessed, the group layout file should be refreshed and republished; When you want to convert the RGB grayscale image to
The GRAY format converts the red RGB image into the CMYK format for channel operation. Otherwise, when these figures are inserted into the color layout, they should have been grayed out.
2 For remote editions, check the correctness and integrity of the layout, such as the date, edition, main title, and make-up of the layout.
(2) The influence of software factors. Decompression software virus infection caused the layout file to be unwrapped and the picture information was damaged. The software parameters of the distribution software were improperly set, resulting in lack of figure missing characters, font changes, missing color separation marks, and color separation errors. We have issued a copy of the document, because it contains RGB format advertising images, and the specific template allows the device related to the school color item is checked, resulting in a serious shortage of color saturation of the printed product and scrapped, prevent this problem In addition to emphasizing that color images must be converted to CMYK format, you can restrict the use of RGB colors in the Feiterware environment.
Defects in the distribution software itself can cause errors. When we use the Founder RIP version 2.1 (2152 kernel) to process a copy file containing the EPS color separation image formed by the dot copy, the image on the C color version becomes reversed phase, resulting in rejects. After the experts pointed out that the reason for this version of the software in the interpretation of the above specific documents can not be output at the same time.
3 Related Quality Problems Caused by Other Causes
Due to receiving or decompressing operations during network congestion, RIP may interpret incomplete documents, resulting in content defect; because of operation reasons, when the film is reversed, the film density is low and the dullness of the graphics is low. In order to cause the film crease marking line; send and discharge the corresponding template selection error to send out undesired film; decompression is not completed under the circumstances of the output is issued, resulting in picture error; with different film, output equipment, processing equipment to fight Tan together with the layout and so on.
In recent years, the advanced high-precision photocopying and flushing equipment and the popular application of powerful and reliable RIP software have greatly improved the output quality of the film, but at the same time they also put forward higher requirements for operators and quality inspectors. Operators should be fully trained and skilled in mastering the system's operating methods and work practices, caring for and maintaining production tools, and maintaining good system operating conditions. Second, the establishment of a fair constraint and incentive mechanism is the key guarantee. It can be said that the prepress staff are on thin ice every day, but Baimi always has a sparse and it is very difficult to have no blind spots in the work. It is important to be good at analyzing the causes from the problems that have already emerged, and to explore the fact that there are many films and times printed in newspapers. The method of improving the efficiency of error correction in a tight and demanding special case, distinguishing the primary and secondary times, and if necessary, listing the detailed indicators for checking and checking. In fact, many of the quality issues in the current newspaper printing, the most part of the prepress lineup, it is recommended to subdivide the quality inspection project, delineate the scope of the quality inspection of each link, and change the rules of the system basically have no penalty. In the meantime, it is recommended that Indian newspapers should formulate Indian point correction and reward methods.
The above is a bit of accumulation and shallow understanding of our work in the newspaper printing factory for more than 10 years. It would be very gratifying to be able to help the industry colleagues. (Author: Lu Cheng Lei Zhang Junzhong)
Factors Affecting the Quality of Newspaper Printing Films
Quality control can be said to be the core task of the production management of printing companies. The quality of the film output from the pre-press photocopying is particularly critical for the quality of the final printed product. The newly-developed printing standards provide detailed reference values ​​for the technical indicators such as field density, film base fog, appearance, and dot quality of the film. However, in the actual work, there are many contents for the quality inspection of the film, because the factors that affect the quality of the film are more complex, and the manifestations of the quality problems are also varied. A slight oversight will leave hidden dangers and transfer them to the follow-up process. . Although we have sophisticated equipment, strict systems, and dedicated employees, daily production still cannot avoid such quality problems. Even the same problems occur repeatedly. Obviously, relying on the responsibility of the relevant staff is not enough, but also diligent in classifying, analyzing and summarizing various quality issues so as to cultivate the “eyesight†for discriminating the quality of the film and improve the ability to correct errors.