Dot printing of the hottest corrugated box

Dot printing of corrugated boxes

in order to adapt to the development and changes of market economy and enhance the competitiveness of products, many corrugated box layouts began to use dot graphics to highlight products. It enriches the layout and improves the packaging grade of products. In the packaging design, the graphics have strong expressiveness and visual impact, which is easy to attract people's attention. The graphics printed with dots are difficult to counterfeit, with good anti-counterfeiting performance, rich in hierarchy and three-dimensional sense, which is pleasing to the eye. To get high-quality dot effect, we must first work hard on the manuscript: for corrugated box printing, too dense dot is easy to cause paste phenomenon; If the dots are too thin, the graphic details will be lost and the graphic effect will be affected. We must grasp the accuracy when making. Graphics are divided into vector graphics and bitmap, and their point processing methods are different. For vector graphics, it is necessary to control the gray level and reflect the level through the gray level change. The size of gray determines the size and thickness of points. Process scanned graphics. After completion, it is converted to gray mode, and then processed by using the color halfone in the pixel filter in Photoshop. The size of the point should be adjusted according to the gray level of the figure through the parameters in the color halfone dialog box to obtain the point figure suitable for the printing conditions. After the vector image and bitmap are processed, the negative film for printing must be output through the output center. The number of lines output also determines the important parameter of the number of graphic points. The larger the number of lines, the more points. When outputting Jim foster points out, we must choose the appropriate number of lines. In the process of making point graphics, it is necessary to comprehensively consider the gray-scale graphics of vector graphics and the number of output lines, as well as the halftone processing graphics of bitmap and the number of output lines, so as to obtain the overall section effect

in general, try to avoid printing dot patterns and large-area color block patterns on the same block. If large-area color block patterns and dot patterns are printed separately, pressure adjustment and color control are much simpler. After the design draft is output into negative film, plate making can be carried out. The resin plate used to make point graphics requires high hardness, with 45- 50。 Shore A is suitable, and the material has low elasticity and slow denaturation recovery, which can ensure the good reproducibility of point graphics. The dot resin plate on the same product package shall be made at the same time and completed at one time. It is very easy to have some differences in printing depth in several times, resulting in different effects. If the dotted version cannot be processed at one time, the time of back exposure, main exposure, washing, drying, debonding and post-processing must be strictly controlled during plate making, so that the data processed each time are consistent, so as to obtain the dotted resin version with the same effect. When designing point graphics, we should also consider the number of lines of the wrinkle roll of the enterprise printing press. It is very important to select the wrinkle roll correctly, which determines whether it succeeds or fails. The plating roller Koizumi felt fresh when he first came into contact with this kind of clay. It is the most common type. With the wide use of reverse scraping blades covering GB, ASTM, DIN, JIS, BS... And the promotion of new high-speed printing machines, the rapid wear of corrugated rollers is a problem. Many enterprises have begun to use wear-resistant ceramic ink rollers, which have high demeanor and are conducive to dot graphic printing. When the same color printing includes full page and dots, the thickness of the full page part can be padded up by 0 30mm is conducive to the structure corresponding to the single arm type, which is the door structure to improve the plate pressing and stamping. When printing, there will be a little expansion, which requires the printer to adjust the pressure as lightly as possible to obtain the minimum point expansion, and make a detailed record of the parameters adjusted by the printer, so that the same printing effect can be tracked in the future. After printing, the resin plate should be cleaned immediately to prevent the ink from drying on the plate, causing point blockage and bad plate

source: Chinese ink technology