Gravure manuscripts must pursue beauty and artistry, but more importantly, it is necessary to facilitate gravure printing and save printing costs. To do this, you can take 10 tips such as shallow net deepening and dirty version.
1. Shallow net deepening
In the design of the intaglio printing layout, if there are red and blue overprint, red and yellow overprint, blue and red overprint, black and red overprint, or black, blue, red and yellow overprint, where the dark dots are less than 25%, it is recommended that it is best when the plate is made Deepen the whole by 3% to 5%.
In the first printing on the machine, the ink used on the deepened plate roller can be diluted with a diluent. Under the premise of unchanged hue, it can be guaranteed that there will be no "shallow dot leakage" phenomenon, which is also called "dry plate" in the printing industry. ".
2. Dirty version
When designing the gravure printing layout, you should also note that if there is a large area of ​​white bottoming, it is best not to design a particularly light black, blue, red, etc. hanging screen before or after the white layout follows the scratch direction, otherwise it will be The phenomenon of "white belt dirty" appears, which is also called "scratching" in the printing industry.
3. Overprint accuracy
The overprint accuracy of gravure printing can only reach 0.2mm, so text and graphics (especially text) with strokes less than 0.4mm cannot be printed by multi-color overlay, and can only be printed with a single ink, otherwise it will easily cause ghosting (overprint Not allowed) phenomenon.
For small text and pattern hollow printing, monochromatic hollowing should be used, multi-color superimposed hollow printing should not be used, and the background color of the photo should not be used for direct hollow printing. For small text and patterns, it is also inappropriate to use text pattern hollow overprint text patterns. Pay attention to the size of the text and the thickness of the strokes.
Text that is too small and strokes that are too thin may not be printed, and printing failures often occur when the pen is broken or even missing. Too small text, if the strokes are too many and too dense and the lines are thick or the printing plate is too dark, it is easy to appear "paste characters".
The transfer performance of gravure printing is not as good as that of lithographic printing, and there is a problem of blocking the plate. Generally, it should be avoided to use the dots below 10%. Especially for large-area background colors, too light dots should be avoided, otherwise the dots will not be reproduced well, which will easily cause uneven color and easy to change color. Even if it is printed at the beginning, because it is too light, it is easy to affect the hue due to the abrasion of the plate roller during the printing process, and the number of printing plates is low. Spot color printing is recommended for large areas of light colors.
4. Shallow
When one text pattern and another text pattern are completely nested and printed, the light text pattern should be expanded to an appropriate size (generally 0.2mm-0.4mm) to make it overlap with the darker text pattern, otherwise in the printing process It is easy to reveal the background color at the joint.
As for how much the lightening is related to the color, if the two colors are opposite colors, the overlapping part produces a black line, which affects the appearance and should be minimized.
5. Setting of spot color printing plate
Trademarks, light-screen overprinting, excessive colors, small characters (text under 5 characters), small five-star patterns, large-area background colors, special effects, etc. There are many colors with high purity, very bright colors, and some fluorescent colors and transparent Special colors, such as color, gold, silver, etc., must be printed with a spot color. At this time, a spot color plate roller must also be produced for printing. Due to coarse particles and other reasons, the general pearlescent ink, golden ink and silver ink should not be used for hanging shallow screen printing.
6. Color sequence
In general, the printing is from dark to light, while the surface printing is printed with light color and then printed with dark color. The two seem to be different. In fact, the human eye sees that the sequence is exactly the same, that is, the dark color is the first to be seen. For color printing with photos, the three primary colors should be printed continuously. Do not put any other spot colors in between, otherwise it is not conducive to the overprint of the three primary colors and the fusion of various layers of ink. The printed photos will be less effective. For K, special 1, special 2, special 3, C, M, Y, K.
Special products can be treated specially, gold is usually put in the first or second color, silver is usually put in the last color (it can be put in other places according to special needs). Spot colors (especially large-area spot background colors) are generally placed between black and blue, so that large-area spot background colors can pass through more printing units to ensure that the ink layer is fully dried, which is helpful to reduce the amount of residual solvent. Of course, special needs can be placed in other places. For example, some layouts are designed with dark lines on the background color, so the background color must be placed after the C (blue), M (red), and Y (yellow) colors.
7. Sharing of printing plates
In order to save costs, most products of the same series will have a common version. Which pages can be shared? Generally speaking, the following factors should be considered to determine whether the printing plate can be shared:
When the white version is shared, consider whether the shape of the hollow is the same, and whether the bag is white under the light spot.
When the silver editions are shared, it depends on whether there is a small silver word, whether the shape of the border line is consistent, and whether the color sequence of each set of editions is consistent. The common version also requires the same color sequence number. The lower edge of the first color scale block is aligned with the lower edge of any light spot. The version circumference, version length, and pattern must be consistent.
8. Design principles of horizontal and vertical patterns
Special attention should be paid to avoiding too dense patterns and lines at a certain position in the vertical direction, otherwise the printing position will produce strong tendons at the position, and the pressure will cause the ink to stick back. At this time, the method of moderately hanging the net can be used to reduce The thickness of the ink layer. If the art designer does not consider the errors in the bag making and slitting process, it will make the bag making and slitting difficult.
The surroundings of the compound bag should be designed to be similar in color or transparent. If the color contrast of the packaging bag or the roll material is large at the top, bottom, left and right, after the vertical and horizontal imposition, there will be a significant contrast at the imposition. Since the cutting of the bag making machine, slitting machine and automatic packaging machine is impossible to be absolutely accurate, there is generally a deviation of more than ± 1mm, so the bag or the rolled film produced by the slitting will be cut at the cutting place. There is a line with a large contrast, which affects the appearance.
For high-strength composite bags and cooking bags, in order to improve strength and protect the ink layer, it is recommended that no color be printed around the composite bag. For the background color with a large area, in the design without transparent edges, the width of the two sides after the imposition must be expanded by 1mm-2mm during the plate making process. In this way, in the slitting and bag making process, even if there are deviations, there will be no transparent edges or aluminum foil, aluminum-plated edges.
9. Setting of cutting track
The detection line width is generally 2mm, generally set to black or spot color, preferably dark.
Large areas with lighter backgrounds, flavoured text or patterns without obvious vertical contrast edges need to be added with a slit tracking line, otherwise it will cause the semi-finished rolls to be unclear and neatly cut.
10. Bleeding and weekly release
If the horizontal size of the pattern exceeds 600mm, the overall bleeding needs to be considered. In addition, the white coating products are printed with gold and silver edges (the electric eye cursor is pressed on the gold and silver edges). The gold and silver patterns need to consider bleeding, bleeding on both sides 0.5 mm—1mm (usually added according to 1mm), so as to avoid the silver edge exposed from the white edge due to slight deviation during the slitting process. Similarly, if the electric eye cursor is pressed against a large area of ​​background color, the large area of ​​the background color should also consider bleeding. The bleeding situation is similar to gold and silver edge bleeding.
The matte BOPP film has a greater shrinkage, and each pattern needs to be increased by 1 mm in the circumferential direction of the plate.
Other films such as PET, PE, PVC, etc. need to be considered in addition.
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