Color box packaging printing process technology control essentials

Color box packaging printing process technology control essentials

Small cartons, carton products, there are often a variety of structural layout coexisting conditions. Such as both field printing-based layout, but also reticulation, text, lines and field pictures coexist in the printing layout; both spectral color can not show the gold, silver layout, but also spot color, four primary colors coexist in the layout. If the use of offset printing, letterpress (or gravure printing, etc.) process printing methods, printing products have their own strengths of the process characteristics, multi-process combination of printing cartons, cartons and other packaging products, to achieve progress in the inner quality of the product.

Offset printing process printing reproduction effect is good, soft color tone, clear dots, printing levels of rich, printing large area layout is not easy to present sticky dirty products of bad phenomena. And letterpress, gravure printing process has a solid and full ink layer, bright colors, gloss senior strengths.

Therefore, the use of different printing process strengths, separate from the printing of those mesh, text, lines and field pictures of both products, as well as a variety of colors of the layout, the set of different printing methods of the strengths of the process “composition” to print the same product, not only can be better to make the use of equipment to get full play, but also product quality and economic efficiency to get simultaneous progress. The economic benefits of synchronized progress.

Offset printing process has a light printing pressure, printing deformation value is relatively small, and the product is not easy to present sticky dirty over the bottom phenomenon, so it is suitable for printing overprint anilox version, lines, fine text, Yin map and large area field layout.

The letterpress process can be realized at once a larger amount of ink supply, more suitable for printing gold, silver ink layout, field, line or text layout. In terms of printing characteristics, offset printing process of the product ink layer is thin, the ink is also briefly dry, and the product does not have the onset of convex marks, does not affect the normal overprinting of letterpress. The letterpress process of the product ink drying slowly, the normal overprinting more or less will form some adverse effects.

Therefore, the overprinting order of the combination of offset and convex products should generally be: offset printing layout first, after the letterpress layout; fine layout first, after the printing of large areas of the layout; strong coverage of the ink color first, strong transparency of the ink color after the printing, such as red and yellow (plus the white ink to weaken the exceptions) on the layout of the superimposed printing of black text or drawings, can be printed on the black layout of the first print, the other colors after the print, so that, due to the superimposed printing of the color transparency of the black color can still reveal the pure black color, the black color can still be seen in the black color. Still be able to reveal the pure black color.

A variety of processes combined with the printing skills control methods

1 good pre-press planning process skills control

Letterpress field layout should be avoided in the same color version of the spelling of subtle negative lines and text, to avoid the pressure, ink supply can not be fully integrated, a brief attack of paste and uneven pressure phenomenon, affecting the quality of the product printing. Gum convex plate surface with overprint parts should try to distance, so that overprint layout around the margins to leave a certain amount of open space or the margins of the light-colored version of the appropriate expansion (so that the margins of the overprint layout can be stacked to cover) so that the slight overprinting prohibited, the naked eye is not easy to detect.

2 good collocation process skills control

Plate with overprinted parts should try to spell in close to the bite and pull the gauge (side gauge), in order to avoid changes in the elasticity of the paper, the onset of overprinting prohibited phenomenon. In addition, the layout of the “river” (core) larger or more color plates, should not be spelled out with two separate processes for overprinting.

3 pay attention to the reasonable selection of offset printing plate material

PS plate has a thin plate material, equipment to the cylinder surface in the future, the angle of wrapping is relatively small, the elongation of the printing plate is also small, and it can adhere to the tighter contact with the cylinder, is conducive to the progress of the accuracy of overprinting of the offset products, so the offset printing process should be selected PS version for printing.

4 pay attention to the good printing plate bottom support process skills control

Small standard packaging products often choose four open or open circular press flat structure of the letterpress printing machine for printing, the characteristics of the plate’s base support material how, on the printing pressure, overprinting accuracy and ink quality effect has a greater impact. The preserved wooden backing is not solid, the squareness, flatness and stability are poor, and it is easy to show bowing and deformation, so it is difficult to ensure the printing quality. Therefore, letterpress printing should be used solid, flat, square, stable aluminum or cast iron magnetic plate and other metallic materials such as the bottom bracket, which is to improve the product registration and ink quality of the foundation.

5 pay attention to good printing pressure control skills

Printing pressure should be adjusted evenly and moderately, the pressure is too large to make the printing sheet stretching and deformation, resulting in overprinting is prohibited, so the printing pressure of the letterpress printing process should not be too large, but as light as possible to the printing pressure, to satisfy the layout of the ink color uniformity, fullness of the premise of the ideal printing.

6 Pay attention to the skillful control of the lining process.

Packing is to realize the pressure and printing

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