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Functional high-dot flexo carton technology
Flexo is a new environmentally friendly packaging and printing technology, and flexo is a green packaging product. Due to the advancement of the material industry, especially the advent of polymer resin plate and ceramic anilox roller, the development of water-based ink printing technology, and successfully solved the ink and irreversible technology. It has become the fastest growing printing method in the world. In particular, it has obvious advantages in improving the environment. In developed countries in Europe and America, it is called "the best and most promising printing method on the earth" and it has become one of the most important printing techniques in the 21st century.
Domestic flexographic printing technology started late, but as a high-tech form of green packaging has become a new focus of attention of the industry. In an era when environmental protection and resource conservation are valued, they will be widely used. In developed countries, flexible manufacturing is still a high technology, and it also belongs to a special industry in China. It has high technical content and advanced technology. The printing materials not only meet the environmental requirements, but also are suitable for high-speed and exquisite packaging graphics and printing. It is extremely challenging for the carton industry.
Green environmental protection packaging refers to packaging that is harmless to the ecological environment and human health, can be recycled, recycled, and used for sustainable development. Many developed countries have also determined that packaging should meet the "4R+1D" principle. That is, low consumption, development of new green materials, reuse, recycling and degradability.
Functional corrugated paperboard and corrugated carton are special packaging, and also a technological innovation product. It is the product of modern science and technology combined with packaging engineering. It reflects the development direction of modern packaging. The key technology is to improve the carton and corrugated board and to carry out functional design and innovation of its structure, which greatly increases the raw material addition. Planting will provide domestic packaging companies with a better choice than the status quo.
High-line overlay printing corrugated box technology and its solution
The flexible printing of high-line corrugated paper is an integrated system cooperation process, which requires adjustment and mutual cooperation of various related links to achieve a relative best value, such as plate making, ink painting, corrugated cardboard and paperboard, printing equipment, and printing technology. It is important to cooperate well. How to achieve flexible printing of high-line corrugated paper, the key technologies are:
Flexible plate making
For flexible platemaking, determine the best solution that can be applied to both printing and product design.
Determine printability conditions
First of all, we must understand the situation of printing equipment, such as the number of unit colors, the type and number of anilox rollers, the basic situation of the paper feeding system and the doctor blade system. There are paper types, white paper or coated paper. A conditional test plate can be provided to test the printability of the printer. It includes a ladder strip for testing the expansion of different flexographic screen points, a color patch for measuring the density of ink in the field, a simple chromatogram for the overprinting of different dot proportions, a yin and yang character and straight line with different font sizes, and a module for measuring trapping errors. To observe the pressure balance of printing pressure bar and so on. Test plates are required to be completed under normal printing board, standard production water-based inks, normal printing pressure and vehicle speed. Of course, you can change some of the printing conditions to get different test samples. Through the analysis of the test sample, we can get the printability of this type of printing press under this condition. The network expansion, curve, waterborne ink density, hue value, dot impact condition, color sequence influence, reduction of fine lines, overprint error, and printing balance pressure are available for each color.
Combining the test data obtained above and the test results of the control test samples, a color matching management system for this printer can be established, such as creating a dot compensation curve for screen dot enlargement, screen color correction and gannina curve correction, and color simulation of proofing. And match and so on.
Determine platemaking process, color separation scheme
In the flexo platemaking process, the determination of the separation process plan is a key factor. For the success of the high-line cable product, it will play a decisive role to some extent, and the separation of the flexible printing should be used. Minimize the amount of color, as pure as possible to complete the color overlay. This is very helpful for printing and reducing costs.
Selection of printing plate screen lines and angles
The number of screen printing screens is limited by the number of lines of the screen roller, requiring a ratio of 1:5 or more. The 400L/in anilox roller can achieve a maximum of 80L/in plate, and the number of lines is too high to paste and produce moire. Therefore, the higher the number of screens, the better. Moreover, 80L/in and 75L/in printing effects will not be much different from the fineness.
Flexographic screen angles mainly use 7, 37, 67, 82, and 7, 22, 52, 82 angles depending on the angle of the anilox roller. However, the screen angle must be based on the actual product, and it cannot be cut across the board. If the monochromatic pattern is hung in a straight line, the angle of the hanging net must be 45 degrees or 0 degrees, otherwise the edge of the hanging pattern will appear more jagged. The selection of the overlapping pattern angle should be based on the principle that the hue angle of the main hue of the product pattern is different by 30 degrees. If the portrait of a portrait is dominated by yellow tones, the color difference between magenta and yellow should be at least 30 degrees. For example, if the scenery is dominated by green, the color difference between cyan and yellow should be above 30 degrees. Otherwise, the moire can easily occur. . Screening simulation before screening to determine the best screening method. Discrete outlets use a certain amount of screening technology to increase the security of products.
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Direct plate making
At present, the direct system is mainly based on extremely high transfer technology. After separation and imposition, the image is directly formed on the resin board. The digital printing plate has complete point type, high light spot is not easy to lose, the printing dot enlargement rate is low, and the adjustment is long. Network, not paste and other advantages. It is the best choice for flexo high-speed line plate making.
High-line flexible printing
Requirements for plate, paper, paperboard, water-based ink and equipment for high-line flexible printing
High-line plate plate selection
High-line plate plate selection, for high-line printing plate, the hardness is slightly higher than the general printing requirements of the plate. This is because such a printing process requires a small amount of ink in order to accurately represent fine dots. If the printing plate is too soft, it will lead to excessive transfer of ink, which is unfavorable to the control of the amount of ink, and is prone to defects such as color cast, blocking of the net, and the like. In addition, it is also required that the plate material has a good dot reproduction range, can produce fine high-gloss dots; has a uniform thickness, good flatness, easy to achieve light pressure printing, easy reproduction of the original; very good flexibility, After being compressed, it can restore the original thickness and the plate material must have a certain degree of toughness. The fine dots are not easy to wear. The plates commonly used for such printing are DuPont's TDR.
Adapt to high-line flexible printed cardboard
It is best to use coated whiteboard paper to achieve the effect comparable to offset printing. Because the coated white paper has a better finish, the print is more glossy and bright. Ordinary white paper surface gloss is poor, the color of the imprint is dull. In addition, coated white paper is different from offset paper and coated paper, which retains part of the original characteristics of white paper - permeability and adhesion, and is conducive to the printing of water-based ink. The paperboard can be used for cardboard with uniform thickness, smooth paper surface, moisture control of 9+2%, and good hardness. E-type, F-type or G-type corrugated, with 180g / m2 face paper. Such paperboard has low corrugation and flat cardboard, which can withstand greater pressure, reduce the appearance of lines and imprints, and improve the quality of printed products.
Ink characteristics and matching ratio
Ink is a key factor in the entire printing process. Water-soluble acrylic and acrylic emulsions are formulated and added with a high-linking agent. For four-color overprinted high net jobs, we must pay attention to the choice of ink. The ink used for printing coated paper is different from ordinary ink. It mainly requires the following features:
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