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The influencing factors of intaglio printing overprint accurate analysis and inquiry

Click:1306 date:2017/11/27 9:26:05
Like other printing methods (such as offset printing, screen printing, etc.), gravure printing products also require that each single version must have a precise and accurate overprint position, if the overprint position deviation occurs, there will be deviation and overprint error, resulting in printed images The color and the level changes, so that the image is blurred, the text of the overprinting trailing, trapping and other phenomena, and to the latter processes (such as stamping, embossing, die cutting, indentation, etc.) increase the difficulty, Affect the quality of printed products, resulting in unnecessary costs increase. The following author on the web intaglio printing overprint accurate factors, talk about their own views. A paper roll tightness 1. Roll tightness on the paper tension The degree of tightness of the paper roll directly affects the paper tension changes, likely to cause instability in printing tension, the back of the print time-based benchmark, and sometimes Lag, which affects the registration of printed graphics. Although almost all gravure machines are equipped with a pre-press sheet tensioning device, if the roll is too loosely rolled beyond the device adjustment, the tension roll will fluctuate too much during the printing process, causing overprinting Not allowed. Once we printed the cigarette label of "Amber King" of Jinan Cigarette Factory with Asian gold cardboard, we found that the overprinting of printed products was good and bad, and the deviation from top to bottom was big. Because the product is a six-color printing, occupy all the printing unit, so initially we think this situation is caused by the inconsistency of the printing pressure of the printing unit, but the printing pressure has been carefully adjusted, the effect is not obvious . Later, a printer in the delivery of ink, solvent and found that unwinding machine at the airbag shaft to the inner paper core loose loose, causing the tension roller to move too fast, sometimes met on the ground, sometimes arrived The highest position, resulting in overprints are not allowed. The problem of overprinting was solved by changing the new roll of paper. 2. How to determine the tightness of the paper I think, first remove the roll of paper on the packaging kraft paper, exposing the internal printing paper, and then carefully observe the volume on both sides of the paper roll neatly, if the paper is relatively homogeneous, that This paper roll uniform degree of tension, you can print on the machine; if the edge out of the paper, uneven, then the paper section is too loose or too tight, should not be used for printing. According to our many years of experience, imports of Web such as the United States, "Viktorvik", Finland's "Double A", Canada's "butterfly" and other white cardboard, Japan's "Sanyo State policy" coated paper and the domestic Ningbo Chunghwa Paper's whiteboard paper, gold East paper coated paper roll of the degree of tension more uniform, in the printing process generally does not appear overprint not allowed the problem. Second, the volume change, paper-receiving factors 1. The impact of the paper on the overprint Currently gravure production line unwinding machine paper used in the way of static paper and dynamic paper two. Regardless of whether the static paper or dynamic paper, paper in the moment of rewinding, uncoiler at the paper under the action of the tension roller are in a quiescent state. At this point the tension roller quickly move up and down, making a slight change in paper tension, printing graphics and thus overprint does not permit the phenomenon. In fact, under normal circumstances, this overprinting phenomenon can be automatically reset to the normal overprinting position by adjusting the overprinting master control console. However, if the new paper roll exchange and printing paper roll is not the same manufacturer, there may be overprint not allowed the issue. Once, when we were printing "Harbin" cigarettes at Harbin Cigarette Factory, we needed to change to another brand of paper, "Hongta" brand, for supplier's reasons. After we finished printing the "Viktorvik" paper and connected the new paper roll, we found that the overprinting problem can not be recovered by the overprinting console, so we can only overprint it by adjusting the printing pressure. After the incident through the analysis, we think, is due to the two kinds of paper quantitative, different thickness led to the printing pressure changes, thus affecting the registration. 2. Paper roll paper joints on the impact of overprint Paper rolls within the paper connector how much will affect the product overprint. This is because the two joints at the junction of the paper overlap, the front and back are tape stick, become thicker, when the joint paper pressure roller printing unit arrived at the Department, the printing pressure changes, resulting in overprints are not allowed. The more the paper roll connector, the more the number of changes in paper tension, the more the number of changes in printing pressure, overprint instability, resulting in a waste of paper. Each roll of paper rolls within a connector, the equivalent of a roll change paper, making the tension changes affect the overprinting. Before printing on the roll, to carefully check whether the outer packaging paper joints, or open the packaging kraft paper to check whether there is a marked line, and timely preparation. At the same time, it is suggested that gravure manufacturers do not use the web with the paper connector in the roll so as to avoid unnecessary waste.

    Three printing pressure In all printing methods, gravure printing exerts the greatest pressure. Printing pressure uniformity and size directly affect the paper tension changes, thus affecting the overprinting. 1. Uniformity of printing pressure According to many years of practice, the author believes that the printing color less products (4 colors), the uniformity of printing pressure on the overprinting will not be too much, as long as the printing pressure to print products Of the requirements; But for the printing color is 4 to 6 colors or even more, it is necessary to adjust the pressure of each printing unit cots, so that each unit pressure roller at both ends to maintain a smooth, consistent, before and after The pressure of the unit is the same. Otherwise, the paper may appear "slack" between the unit and the unit, making the paper slack, or the paper wraps around the intaglio cylinder to damage the squeegee blade. In addition, in daily work, to keep the platen surface clean, because some abnormal downtime (such as breaking paper, sudden stop, etc.) will ink tank and small ink spill ink, imprint roller will inevitably stick On some, the ink forms a solid ink layer on the rubber roller, which increases the partial circumference of the rubber roller, thereby changing the uniformity of the rubber roller and accelerating the aging of the pressure roller. 2. The size of the printing pressure The size of the printing pressure is also more critical, under normal circumstances, can be normal downtime to verify the size of the printing pressure. If in normal downtime, the pressure roller of each unit can just lift up automatically, indicating that the printing pressure is the right size. Of course, this time for some color blocks (such as gold, red background, etc.) may appear false printing, that is, "the virtual hair" phenomenon, so you can press the actual printing conditions, while maintaining the pressure uniformity on the basis of an appropriate increase in a unit Printing pressure. Four-print version of the axis of the gravure version of the roller cylinder into a shaft version and shaftless version of the drum. For the shaftless version, each edition requires a shaft to support. Version of the shaft in use after many times, the shaft will wear more and more fine, the outer metal sleeve will move up and down, so that version of the cylinder rotation eccentric movement and the impact of overprinting. For the shaft version of the drum, due to the higher plate-making fee, the printing plate cylinder manufacturers will be repeated stripping use, in the process (800 million revolutions above), the shaft will become more and more fine, appear The above result. If you want to continue to use this version of the cylinder, it is recommended to reduce the relative size of the shaft metal sleeve diameter, because a shaft with a printing plate cylinder production costs are higher, while the shaft sleeve metal processing prices are relatively much cheaper. Five plates fixed plug in the change of plate, if the gravure tight plug too loose, it will make the printing plate cylinder in the axial movement under the influence of embossing roller, there is not allowed by the horizontal and horizontal overprinting malfunction. So at the end of the plate change work, product overprinting, be sure to carefully check all gravure unit solid plate plug is loose. Tightening plug internal bearing wear will also affect the overprinting. If the wear is serious, there will be movement of the shaft metal sleeve, intaglio beat trouble. In order to prevent bearing wear, each time you change the plate, you must apply a certain amount of grease to the internal bearing of the tightening plug. Six photoelectric scanning head Photoelectric scanning head is a key part of the detection of intaglio overprint, which scan the signal sent directly to the console, so the signal stability or overprint plays a crucial role. The following on the photoelectric scan head use and maintenance for a brief description. Optical scanning head detection angle and the printed color is closely related. Under normal circumstances, such as red, black, gold, green and other darker colors, because the signal is strong, so the scanning head can be directly examined; and for yellow (transparent yellow, yellow, light yellow), light brown and gold and silver The white printed on paperboard, etc., Because the signal is weak, the scanning head must be rotated at a certain angle to detect, but also gently adjust the fine adjustment knob on the scanning head until the signal displayed by the main control station is stable. When arranging the gravure process and making the gravure printing plate, the darker color is generally used as the reference color of the overprinting. The advantage of doing so is that it is convenient for production on the overprinting. In order to prevent the scanning head to provide the wrong signal, in the daily work to keep the photoelectric scanning head cleaning, the main cover personnel should regularly check the scanning head, so that the testing head is transparent and clear, to prevent dust, paper, paper and ink particles Other debris into the photoelectric tube inside, interference scanning signal.
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