Dot printing of corrugated boxes
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In order to adapt to the changes in the market economy and enhance the competitiveness of products, many corrugated carton layouts began to use dot patterns to highlight products. Enriched the layout and improved the packaging grade of the product. In the packaging design, the expressiveness of the graphics and the visual impact are strong, which is very easy to attract people's attention. The graphics printed by the dot are difficult to counterfeit, the anti-counterfeiting performance is good, the layering is full, and the three-dimensional feeling is pleasing to the eye. In order to get high-quality outlet effect, we must first work hard on the draft: For corrugated box printing, the dot is too dense and easy to cause paste phenomenon; if the dot is too thin, the graphic details will be lost, affecting the graphic effect, and the production must be accurate. . The graphics are divided into two kinds of vector graphics and bitmaps. The processing methods of the dot are different. For the vector image, the grayscale is controlled, and the grayscale changes are used to represent the layer. The size of the grayscale determines the dot size and the thickness. Process the scanned graphics. After it is full, it is converted to grayscale mode, and then processed by color halftone in the filter Pixelate in PHOTOSHOP. The size of the dot is adjusted according to the parameters of the color halftone dialog box according to the graphic grayscale, and the dot pattern suitable for printing conditions is obtained. After the vector graphics and bitmaps are processed, the output center is required to output the negatives for printing. The number of output lines also determines the important parameters of the number of graphics points. The larger the number of network lines, the more the number of dots, and the output must be selected. The number of network lines. In the process of making the dot pattern, the overall pattern of the mesh shape can be obtained by considering the grayscale pattern of the vector image and the number of output network lines, and the halftone processing pattern of the bitmap and the number of output network lines. In general, as far as possible, the dot pattern and the large-area patch pattern are printed in the same block. If the large-area patch pattern and the dot pattern are separately printed, the pressure adjustment and color control are much simpler. After the design draft is output into a negative film, the plate can be plated. The resin plate used to make the dot pattern requires a higher hardness of 45. -50. Shore A is suitable, and the material has low elasticity and slow recovery, which ensures better reproducibility of dot pattern. Make the resin plate on the same product package as much as possible at the same time, once. It is very easy to appear the difference in the printing depth of the dots, which has different effects. If the dot version cannot be processed at one time, the back exposure, main exposure, rinsing, drying, debonding and post-processing time must be strictly controlled during the plate making, so that the data of each processing is consistent, so as to obtain the same effect of the dot resin plate. When designing the dot pattern, it is also necessary to consider the number of screen lines of the anilox roller of the enterprise printing machine. It is very important to correctly select the anilox roller, which determines the success or failure. The plated roller is the most common type. With the widespread use of anti-scratch blades and the promotion of new high-speed presses, the rapid wear of anilox rolls is a problem. Many companies have begun to use wear-resistant ceramic ink rollers. Its high degree of elegance is conducive to dot printing. When the same color printing includes full plates and dots, the thickness of the full plate portion can be increased by 0.15-0.30 mm to improve the plate pressing and printing pressure. There will be dot gain during printing, which requires the printer to adjust the pressure as lightly as possible to obtain the smallest dot gain, and to record the parameters of the press adjustment in detail so that the same printing effect can be tracked later. After printing, the dot resin plate should be cleaned immediately to prevent the ink from drying on the plate surface, causing the dots to become clogged, resulting in a bad plate.