3. Improper selection of printing paper
(1) The selected sheet of paper, if there is a large curl, will cause difficulties in feeding and affect the printing efficiency.
Due to papermaking process, equipment, operation and other reasons, the expansion and contraction ratios of the front and back sides of the paper are different, and the greater the gap, the greater the curling. In addition, a single sheet cut from webs tends to form a habitual curl. When encountering such a paper, it is difficult to cut the small error, and it is difficult to feed the paper during printing, which seriously affects the printing efficiency and printing rules. In order to reduce the impact, the operator of the machine tool must repeatedly fold paper and knock paper in the opposite direction, which will often leave creases on the pages and affect the beauty of the books. It is still necessary to repeatedly fold paper and knock paper when folding. Due to poor rules, folding errors may be large or even exceed the standard.
(2) The selected paper, such as powder falling, hair loss, etc., will seriously affect the quality of the printed paper. Because the surface of the paper is not well combined with the paper surface, these fibers are easily peeled off from the paper surface during printing to cause hair loss. Some papers have too high amount of filler, paper powder produced by cutting, and paper powder falling on the paper during the processing process all affect the quality of the printed product, and also affect the printing efficiency. First of all, paper powder and paper hair will cause some inks to not be transferred onto paper. Once these impurities are transferred to the plate or blanket, white spots and white spots will appear on the images of the prints, which may even cause serious waste. Second, when these impurities are mixed with the ink, depositing on the printing plates or blankets will cause heaping of ink, and the images of the printed products will become rough and fuzzy, the colors of the images will not be bright, the dots will be increased, the resolution will be reduced, and the images will be worn out. Incomplete, and then produce paste version, version. This not only seriously affects the quality of printed products, but also causes the printing plate's resistance to printing force to decline, frequent plate change, and even damage the blanket. In order to avoid falling powder and lint, additives can be added to reduce the viscosity of the ink, control the amount of fountain solution, reduce the printing pressure, often clean the blanket, or paper over the machine or printed on a copper plate paper White oil. But these methods must be adequate, otherwise,
First, adding a series of additives can easily cause ink emulsification and prolonged drying time.
Second, reducing the amount of fountain solution, can easily lead to dirty version, paste version;
Third, reducing the printing pressure will affect the transfer of ink;
Fourthly, increasing the number of cleaning blankets not only increases the labor intensity of the operators, but also affects the work efficiency. Moreover, multiple shutdowns and startups cause hue changes, and some papers require printing of about 200 sheets to clean the blanket. This is a more effective way to reduce the effect of falling powder and hair loss.
Fifth, printing over the machine or printing a layer of white oil on coated paper increases costs, wastes time, and brings other problems.
(3) The grain direction of specialty paper, if not selected, affects the quality of the printed product
When the lines of special paper are in the same direction as the printing direction, there may be tearing and wrinkling of the paper. When the lines of the special paper are perpendicular to the printing direction, ghosting is likely to occur; when the elasticity of the lines is large, overprinting is not allowed. When using specialty paper as a cover or as a cover for a mouthpiece, the folds tend to fluff or even break. When the special paper has embossed patterns, it is easy to make misprints and flowers, thereby affecting the appearance quality.
From this it can be seen that there are a number of hidden problems that have produced quality problems before printing. In order to really improve the quality of products, in addition to the printing plants strengthening the internal process management and quality management, the publishing house should pay more attention to the overall coordination and printing of the printing process design. Pre-quality control. On this issue, the author talks about some of his personal views and discusses with people in the industry.
Some personal opinions on the above issues
(1) The publisher should strengthen the process design of the prepress product, determine the type of printing paper before production, whether it is coated paper, offset paper, or specialty paper; the copied picture is to restore the original or adjust the color, and the color picture produces black and white effect or The color effect of black and white pictures is to pay attention to the level or to high contrast. These requirements are best indicated, especially when there are special requirements, they must be explained before production. In this way, the output unit can arrange the plate making process according to the requirements, and when printing the traditional samples, the same paper as the printing can also be selected, thereby shortening the gap between proofing and printing.
(2) Emphasis on pre-press production. The quality of control film and plate-making film must have a strict auditing system, and require that output units have effective inspection methods. As far as possible, the quality of the film will be sent to the printing factory; in order to ensure the quality of the image, the product with the picture will be best proofed, and the color product is best able to play digital samples matching the printing. For example, if you want to save costs, you can sign it with your machine.
(3) Comprehensively determine the principle of paper selection based on paper price, performance, printability and design intent, and try to ensure that the paper meets printing requirements and design results. For the printing quality of the machine, the paper should be replaced by the paper supply unit to ensure that the book printing quality meets the national standard.
(4) Frequently to all the cooperatives to understand their equipment and technical conditions, through the provincial quality inspection station to the results of the book search or self-inspection of the publishing house, and to select processing facilities that are equipped with advanced equipment, advanced technology, and stable quality. The use of advanced technology for prepress, printing and postpress processing is the basic guarantee of quality control.
If the prepress management of the publishing industry can be strengthened, some hidden dangers of quality will be eliminated from the source. This will not only further promote the improvement of product quality, but also reduce the waste of processing companies, thereby saving the time of publication and printing. Of course, as a processing company, it is necessary not only to ensure the quality of processed products, but also to actively cooperate with the publishers in order to continuously improve the quality of publications.
(1) The selected sheet of paper, if there is a large curl, will cause difficulties in feeding and affect the printing efficiency.
Due to papermaking process, equipment, operation and other reasons, the expansion and contraction ratios of the front and back sides of the paper are different, and the greater the gap, the greater the curling. In addition, a single sheet cut from webs tends to form a habitual curl. When encountering such a paper, it is difficult to cut the small error, and it is difficult to feed the paper during printing, which seriously affects the printing efficiency and printing rules. In order to reduce the impact, the operator of the machine tool must repeatedly fold paper and knock paper in the opposite direction, which will often leave creases on the pages and affect the beauty of the books. It is still necessary to repeatedly fold paper and knock paper when folding. Due to poor rules, folding errors may be large or even exceed the standard.
(2) The selected paper, such as powder falling, hair loss, etc., will seriously affect the quality of the printed paper. Because the surface of the paper is not well combined with the paper surface, these fibers are easily peeled off from the paper surface during printing to cause hair loss. Some papers have too high amount of filler, paper powder produced by cutting, and paper powder falling on the paper during the processing process all affect the quality of the printed product, and also affect the printing efficiency. First of all, paper powder and paper hair will cause some inks to not be transferred onto paper. Once these impurities are transferred to the plate or blanket, white spots and white spots will appear on the images of the prints, which may even cause serious waste. Second, when these impurities are mixed with the ink, depositing on the printing plates or blankets will cause heaping of ink, and the images of the printed products will become rough and fuzzy, the colors of the images will not be bright, the dots will be increased, the resolution will be reduced, and the images will be worn out. Incomplete, and then produce paste version, version. This not only seriously affects the quality of printed products, but also causes the printing plate's resistance to printing force to decline, frequent plate change, and even damage the blanket. In order to avoid falling powder and lint, additives can be added to reduce the viscosity of the ink, control the amount of fountain solution, reduce the printing pressure, often clean the blanket, or paper over the machine or printed on a copper plate paper White oil. But these methods must be adequate, otherwise,
First, adding a series of additives can easily cause ink emulsification and prolonged drying time.
Second, reducing the amount of fountain solution, can easily lead to dirty version, paste version;
Third, reducing the printing pressure will affect the transfer of ink;
Fourthly, increasing the number of cleaning blankets not only increases the labor intensity of the operators, but also affects the work efficiency. Moreover, multiple shutdowns and startups cause hue changes, and some papers require printing of about 200 sheets to clean the blanket. This is a more effective way to reduce the effect of falling powder and hair loss.
Fifth, printing over the machine or printing a layer of white oil on coated paper increases costs, wastes time, and brings other problems.
(3) The grain direction of specialty paper, if not selected, affects the quality of the printed product
When the lines of special paper are in the same direction as the printing direction, there may be tearing and wrinkling of the paper. When the lines of the special paper are perpendicular to the printing direction, ghosting is likely to occur; when the elasticity of the lines is large, overprinting is not allowed. When using specialty paper as a cover or as a cover for a mouthpiece, the folds tend to fluff or even break. When the special paper has embossed patterns, it is easy to make misprints and flowers, thereby affecting the appearance quality.
From this it can be seen that there are a number of hidden problems that have produced quality problems before printing. In order to really improve the quality of products, in addition to the printing plants strengthening the internal process management and quality management, the publishing house should pay more attention to the overall coordination and printing of the printing process design. Pre-quality control. On this issue, the author talks about some of his personal views and discusses with people in the industry.
Some personal opinions on the above issues
(1) The publisher should strengthen the process design of the prepress product, determine the type of printing paper before production, whether it is coated paper, offset paper, or specialty paper; the copied picture is to restore the original or adjust the color, and the color picture produces black and white effect or The color effect of black and white pictures is to pay attention to the level or to high contrast. These requirements are best indicated, especially when there are special requirements, they must be explained before production. In this way, the output unit can arrange the plate making process according to the requirements, and when printing the traditional samples, the same paper as the printing can also be selected, thereby shortening the gap between proofing and printing.
(2) Emphasis on pre-press production. The quality of control film and plate-making film must have a strict auditing system, and require that output units have effective inspection methods. As far as possible, the quality of the film will be sent to the printing factory; in order to ensure the quality of the image, the product with the picture will be best proofed, and the color product is best able to play digital samples matching the printing. For example, if you want to save costs, you can sign it with your machine.
(3) Comprehensively determine the principle of paper selection based on paper price, performance, printability and design intent, and try to ensure that the paper meets printing requirements and design results. For the printing quality of the machine, the paper should be replaced by the paper supply unit to ensure that the book printing quality meets the national standard.
(4) Frequently to all the cooperatives to understand their equipment and technical conditions, through the provincial quality inspection station to the results of the book search or self-inspection of the publishing house, and to select processing facilities that are equipped with advanced equipment, advanced technology, and stable quality. The use of advanced technology for prepress, printing and postpress processing is the basic guarantee of quality control.
If the prepress management of the publishing industry can be strengthened, some hidden dangers of quality will be eliminated from the source. This will not only further promote the improvement of product quality, but also reduce the waste of processing companies, thereby saving the time of publication and printing. Of course, as a processing company, it is necessary not only to ensure the quality of processed products, but also to actively cooperate with the publishers in order to continuously improve the quality of publications.
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