Flexo printing starts from design and from printing(one)
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Today's packaging is growing, various printing methods are also in the process of development; the requirements of packaging in the world have also undergone some changes, in addition to a single consideration of cost, but also more environmental issues, especially some food packaging; Flexographic printing is the most environmentally friendly printing method in various printing methods.
Domestic flexographic printing is also growing, but it is still in the development stage. In this development process, various manufacturers are also accumulating experience. However, since offset printing and gravure printing have a long development time in China, most people in the subconscious are using offset printing samples or gravure samples as standards, and using such a standard to look at other printing methods.
Each printing method has its own unique features:
Offset printing
Advantages:
■High precision of printing registration, multicolor superposition of spot color patterns or text
■The dot expansion is small and the gradient is excessively supple
Disadvantages:
■The field ink layer is thin
■ Unstable quality
■The range of printed materials is not wide
■Inline processing capability is not strong
Gravure
Advantages:
■ Gravure can be used together with the gradient version of the network cable. It can achieve better results in the printing of the field and the network cable by engraving the depth of the engraving.
■Gravure solid ink layer thickness
■The pattern can be seamless
Disadvantages:
■ Unstable quality
■The range of printed materials is not wide
■Inline processing capability is not strong
Flexo printing is a kind of printing between the two. Its ink layer is thicker than offset printing, and the registration accuracy is higher than that of gravure printing.
Features of flexographic printing:
■Green printing
■High color saturation
■Print quality is stable
■Flexible combination printing
■Screen printing
■Offset printing
■Gravure
■Bronzing, die-cutting unit line processing to finished product
We all know that in a package, if you want to print the effect, then the most basic is the need for a good plate, a good plate is the basis for printing a good product; and a good plate is what conditions are needed. For the flex version, the following points are required:
l suitable for flexographic printing design
l Reasonable process arrangement
l color separation
L-making level
The effect of a package printing is that it is designed for printing.
Design attention elements:
■Printing method
■ Imposition
■Material direction
Designed for different printing styles, such as flexo design, multi-color spot color can be designed, because flexo printing is based on anilox roller, which is more stable than offset printing and gravure ink transfer. The anilox roller is quantitative, as long as the same anilox roller is used, the amount of ink transferred to the plate at the same time is basically the same; the ink color is stable.
Since the registration accuracy is worse than offset printing, it is usually the case that the offset printing is only ymck four colors, and many small characters are overprinted with two or three colors. If flexo printing also uses multicolor to overprint small text, the effect is definitely not good, so you can make a spot color for printing. This not only reduces the problem of overprinting, but also stabilizes the color of the text.
The picture below is a small text folded in two colors. We can see that the text has two color edges due to the overprint problem.
Design manuscript will affect
■Printing effect
■ Overprint
■Image restoration
■Stable quality
■ plate printing durability
■ Die cutting and downstream processing
Precautions for Flexo Prepress Design Avoid the following:
Small text, small lines
Two-color or multi-color overprinted lines or text
Small reverse white text or reverse white lines
Picture high light off the net, or 1% small dots
Make lines and text in photoshop software
Design wide and long bars and field in the horizontal direction of the printing cylinder
Avoid long and wide gradient designs in the printing direction
Large area field with dots and small text on the same layout
Unification of operating software
Black file made in vector file Black frame in the field (jaming appears)
Design artwork format
Because the design company is in the design, often some ideas need to be operated in photoshop, but because the flexo printing needs to be adjusted according to the characteristics of flexo printing on the image before printing, if there is a layered file, it is best to save it as psd. format
At the same time, do not put the final program of the final layout of the entire design draft, picture and text in photoshop software.
Picture accuracy 300dpi
Graphic design operations can be used in Illustrator, Freehand professional typesetting software
Reasonable craftsmanship also has a great impact on printing. Since more flexo products are now transferred from the original offset or gravure, we have to change the process, such as the following sample, which was originally concave. If the print is printed in a single color, the ink layer is not as gravure as it is on the ground, so we need to do two-color printing on the spot, so that the spot can be printed and the gravure is close to the spot. Gradient can also get a delicate effect.
Please see the print comparison:
Gravure print, soft print, monochrome, second print, soft print
The color separation is also crucial for the printing effect.
Color separation principle:
Is it close to the original
• Processed according to different printing characteristics
• Image contrast
• Image contrast
• Image authenticity
• Meet the requirements of plate making
(Although we say that flexo should try not to do the net, but some products we can also use the net effect, of course, we need to do some technical processing in the image. The printed product, the opposite color will not be paved 3 % of the outlets are darkened, and there is no hard mouth like the normal broken net. The following picture is made by the use of the absolute network technology (this picture won the 5th National Flexo Product Evaluation Award)
After the computer file is processed, we need to output the file to the film. The flexographic plate-making film requires the use of frosted film. When vacuuming during the plate making process, the surface of the film has a slight frosting, which is conducive to the discharge of air. The film is closely attached to the plate, and the pattern produced by the film does not deform. Due to cost considerations, some plate-making companies use a film without scrubs (commonly known as "light film"). The version that comes out of this is often due to suction problems. The dots, texts are thicker or the partial white pattern is lighter. The strokes are not clear.
The flexographic plate-making film requires a density in the range of 4.0-4.3, and the output is a negative image, while the offset film generally has a density of about 3.5, some lower, and the output is a positive image; if the density is too low, when exposed, The light will pass through the black area of the film, resulting in insufficient depth of the graphic when washing, the yang text becomes thicker, and the white text becomes ambiguous. At the same time, we require that the film white film should be below 0.07, otherwise it will affect the quality of the printed plates.
Since the elongation of the printing plate must be compensated for during flexographic printing, the film must be deformed according to the printing circumference of the customer. Therefore, if the film directly takes the offset printing product, it is not acceptable. On the one hand, it is a positive image, on the other hand, the offset printing product is not deformed on the film.