Small carton and carton products often have various structural layouts coexisting. For example, there are layouts mainly based on field printing, as well as printing layouts with coexistence of netting, text, lines and solid patterns; both gold and silver layouts that spectral colors cannot display, and layouts with spot colors and four primary colors coexisting. If offset printing, embossing (or gravure printing, etc.) processes are used in different printing methods, the printed products each have advantageous process characteristics. Multi-process combination for printing carton, carton and other packaging products can improve the internal quality of the product. The printing effect of offset printing is good, the color is soft, the dots are clear, the printing level is rich, and the large area of ​​the printing surface is not prone to the phenomenon of sticking dirty products. The embossing and gravure printing process has the advantages of thick and full ink layer, bright colors and high gloss. Therefore, use the advantages of different printing processes to print those products that have a combination of mesh, text, lines and solid patterns, as well as layouts of various colors, combining the advantages of different printing methods, using the process "synthesis" to print the same The product can not only give full play to the utilization rate of the equipment, but also improve the product quality and economic benefits simultaneously.
Various reasonable arrangements combined with printing process
The offset printing process has light printing pressure, relatively small printing deformation value, and the product is not prone to sticking to the bottom phenomenon, so it is suitable for printing chromatographic screens, lines, fine text, negative images and large-area solid layouts.
The relief printing process can achieve a large amount of ink supply at one time, which is more suitable for printing gold, silver ink layout, solid, line or text layout. In terms of printing characteristics, the ink layer of the offset printing process is thin, the ink is also easy to dry, and the product does not produce embossed marks, which does not affect the normal overprint of the embossed printing. The ink color of the relief printing process dries slowly, which will cause some adverse effects on the normal color registration. Therefore, the overprinting sequence of the combination of offset and convex should generally be: offset printing first, then convex printing later; small printing first, large area printing later; ink with strong hiding power, ink after strong transparency Printing, such as red and yellow (with the exception of white ink dilution), black text or patterns are overlaid on the layout, the black layout can be printed first, and other colors are printed afterwards. In this way, due to the strong transparency of the overprint color, black can still show pure black Color.
The technical control essentials of combining multiple processes with printing
1. Do a good job in the technical control of pre-press design
The relief solid layout should avoid the small shaded lines and text in the same color version, so as to avoid the pressure and ink supply cannot be taken into account, and it is easy to produce paste and uneven pressure, which affects the printing quality of the product. The overprinted parts of the offset printing plate should be separated as far as possible, so that there is a certain gap around the edges of the overprinted plate surface or the edges of the light-colored plated plate can be appropriately enlarged (so that the edges of the overprinted plate surface can be stacked and covered), so that slight overprinting is not allowed. It's hard to detect with the naked eye.
2. Do a good job in the technical control of the imposition process
The overprinted parts of the layout should be as close as possible to the bite and pull gauge (side gauge) to avoid the inaccurate overprint due to the expansion and contraction of the paper. In addition, the layout of the "Ghe River" (separate core) with a large layout or multi-block color registration should not be spelled as two types of processes for overprinting.
3. Pay attention to the reasonable selection of offset plates
The PS plate has a thinner plate material. After it is installed on the surface of the cylinder, its wrap angle is relatively small, and the elongation of the printing plate is also small. Moreover, it can maintain tight contact with the cylinder, which is beneficial to improve the overprinting of rubber and convex products Accuracy, therefore, the offset printing process should choose PS version for printing.
4. Pay attention to the process technology control of the plate support
Small-sized packaging products are often printed with a letterpress machine with four-fold or half-round flattening structure. The characteristics of the base material of the printing plate have a great influence on the printing pressure, overprint accuracy and ink quality effect. effect. The traditional wooden undercarriage has poor material, squareness, flatness and stability. It is prone to bowing and deformation, and the printing quality is difficult to guarantee. Therefore, letterpress printing should use solid, flat, square, and stable aluminum or cast iron magnetic plate and other metallic materials. This is the basis for improving product registration and ink quality.
5. Pay attention to close the printing pressure control technology
The printing pressure should be adjusted evenly and moderately. If the pressure is too large, the printed sheet will be stretched and deformed, causing overprinting. Therefore, the printing pressure of the embossing process must not be too large, and the lightest printing pressure should be used to meet The ideal ink is printed on the premise that the ink color on the layout is uniform and full.
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