Small carton and carton products often have various structural layouts coexisting. For example, there are layouts based on solid printing , and print layouts with coherent textures, lines, lines and solid patterns; gold and silver layouts that cannot be displayed in spectral colors, and layouts with spot colors and four primary colors. If the printing method is different by offset printing , embossing (or gravure printing, etc.), the printing products each have advantageous process characteristics, and multiple processes are combined to carry out packaging products such as printing cartons and cartons, thereby improving the intrinsic quality of the products.
The offset printing process has good printing and reproduction effect, soft color tone, clear dot, rich printing layer, and printing of large-area layout is not easy to appear bad phenomenon of sticky products. The embossing and gravure printing processes have the advantages that the ink layer is thick and full, the color is bright, and the gloss is high.
Therefore, by using the advantages of different printing processes, respectively, to print those products that have both mesh, text, lines and solid patterns, as well as the layout of various colors, to combine the advantages of different printing methods, to use the process "synthesis" to print the same The product can not only fully utilize the utilization rate of the equipment, but also improve the product quality and economic benefits.
Reasonable arrangement of various combinations of printing processes
The offset printing process has light printing pressure, relatively small printing deformation value, and the product is not easy to be sticky and dirty, so it is suitable for printing colored mesh patterns, lines, small characters, negative images and large-area solid layouts.
The embossing process can achieve a larger ink supply amount at one time, and is more suitable for printing gold, silver ink layout, solid, line or text layout. In terms of printing characteristics, the offset printing process has a thin ink layer and easy drying of the ink, and the product does not have a embossing and does not affect the normal overprinting of the embossing. However, the ink color of the embossing process is slow to dry, which may cause some adverse effects on the normal color registration.
Therefore, the overprinting order of the adhesive-bonded product should generally be: the offset printing surface is printed first, the embossed printing surface is printed later; the small layout is printed first, and the large-area printing is printed on the back; the strong hiding power is printed first, and the transparency is strong after the ink color Printed, such as red and yellow (with the exception of white ink), the black text or pattern can be overprinted, the black layout can be printed first, and the other colors are printed later. Thus, due to the transparency of the overlay color, black can still reveal pure black. Color.
A variety of processes combined with the technical control of printing
1. Process technology control for prepress design
The embossed solid layout should avoid the use of small shades and characters in the same color version, so as to avoid the pressure and ink supply being insufficiently balanced, and it is easy to produce paste and pressure unevenness, which affects the printing quality of the product. The overprinted part of the adhesive embossed surface should be pulled as far as possible, so that there is a certain gap around the edge of the overprinted surface or the edge of the light-colored layout is appropriately enlarged (so that the edge of the overprinted surface can be overlapped and covered), so that slight overprinting is not allowed. It is not easy to detect on the naked eye.
2, do a good job of technical control of the imposition process
The parts of the layout with overprint should be placed close to the bite and the pull gauge (side gauge) to avoid the inaccurate overprint due to the expansion and contraction of the paper. In addition, the layout of the "cross-river" (separator) larger or multi-plate color layout, should not be spelled separately with two processes for overprinting.
3, pay attention to the rational selection of offset printing plates
The PS version has a thinner plate. When mounted on the surface of the roller, its wrap angle is relatively small, the plate has a small elongation, and it can maintain a tight contact with the roller, which is beneficial to improve the overprinting of the adhesive product. Accuracy, therefore, the offset printing process should choose the PS version for printing.
4, pay attention to the control technology of the printing plate
Small-sized packaging products are often printed on a letterpress printing machine with four-open or split-flat flattened structure. The characteristics of the base material of the printing plate have a great influence on printing pressure, overprinting precision and ink color quality. effect. The traditional wooden bottom support is not solid enough, the squareness, the flatness and the stability are relatively poor, and it is easy to appear bow and deformation, and the printing quality is difficult to guarantee. Therefore, the letterpress printing should use a solid, flat, square, stable aluminum or cast iron magnetic plate and other metal materials, which is the basis for improving the registration and ink quality of the product.
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. Look forward to your cooperation!
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