1. Suede varnish and metal varnish
In view of the characteristics of modern printing, environmental protection and anti-counterfeiting effectiveness, on the basis of water-based varnish, some special effects of water-based varnish have been added. Among them, water-based suede varnish and metal varnish are of high value.
Water-based suede varnish is a suede effect during the drying process after glaze coating using a water-based glazing system. The strength of the suede effect is related to the amount of varnished varnish. If a ceramic anilox roller is used Light system, by adjusting the line number of the anilox roller to achieve the purpose of changing the amount of oil, in order to enhance or weaken the suede effect.
The water-based metal varnish uses a water-based glazing system to present a metallic color on the surface after glaze coating. There are many colors, including silver, bright gold, bronze gold and other colors. The strength of the metal color is mainly The amount of light is related. The greater the coating amount, the stronger the metal effect.
2. Free alcohol (ipa) fountain solution
In order to reduce the amount of alcohol used in printing production and improve printing quality, the use of alcohol-free fountain solution has become a trend. In response to this situation, a new alcohol-free fountain solution by varn has solved this problem.
(1) Addition amount of fountain solution: 3-5%;
(2) Addition amount of isopropyl alcohol: 0-6%; it depends on the addition amount of fountain solution and the water supply method of the printing machine, and does not need to be continuously added during the production process;
(3) When using alcohol-free fountain solution, it should be noted that due to the adaptability and operation habits of the fountain system to the fountain solution, it is recommended to reduce alcohol first, and then run alcohol-free after a period of time.
When using alcohol-free fountain solution, please note that the original water roller of the printing machine contains hydrophilic substances, which is a water roller that can directly use alcohol-free fountain solution. To the use of alcohol-free fountain solution.
Three. Hybrid technology application
1. Waterborne varnish hybrid technology
The water-based varnish hybrid technology refers to the technology that can display both high-gloss and matte gloss effects in one printing on the same print.
The hardware requirements of this technology are relatively high, and the operation technology and application technology are relatively simple:
(1) The printing material must be high-gloss paper;
(2) The printing equipment must be 5 + 1 or above equipment;
(3) Use oily matte oil in the last color group for local glazing by ps version, and then use high gloss water-based varnish to complete the full version of the glazing color group. Note that oily matte oil and water-based high gloss varnish are Special varnish, not ordinary varnish;
(4) Control the contrast effect of gloss and matt by adjusting the coating amount of oily matte oil.
2.uv varnish hybrid technology
The uv varnish hybrid technology is a printing technique that can produce the following two effects using uv varnish in one printing: branch pattern and highlight effect; matte and highlight effect.
(1) The requirements of uv varnish hybrid technology for printing hardware are similar to water-based varnish hybrid technology. It needs to be printed on high-gloss paper, and requires more than 5 + 1 printing equipment. The operation is similar, but the drying method is ultraviolet curing drying. , Hardware requirements are higher;
(2) Adjust the contrast effect of branches and highlights and adjust the contrast effect of matt to highlights by adjusting the amount of ink on the oily uv varnish. Please pay attention to the drying problem of uv varnish to ensure uv light Oil drying can properly reduce the printing speed, the specific speed is determined by the drying situation;
(3) At the same time, please note that the twig effect oily varnish and high gloss uv varnish that complete the twigs and highlights are special varnishes used in combination; the matte varnish and high gloss uv varnishes that complete the matt and highlight effects It is a special varnish used in conjunction.
4. Application of mfx technology
The mfx technology is a kind of metal color effect that can be printed using ordinary five-color printing, including complex metal colors such as transition levels of metal colors. The ordinary printing method generally uses spot color inks to print one by one for various metal colors. Solved, but it is not ideal for the gradation transition printing effect. The effect of printing metal spot colors using mfx technology is very ideal.
(1) Printing substrates require high-gloss substrates, such as substrates such as coated paper;
(2) Five-color inks are silver, yellow, magenta, cyan, and black. Among them, silver ink requires high brightness and strong surface binding ability; four-color ink requires high brightness, saturation and transparency;
(3) The color sequence is silver, black, blue, red, and yellow, and printing is performed by wet pressing wet, so that the transition effect and fluidity effect of the metal color are better;
(4) The printing speed is 5000-7000 sheets / hour.
V. Pearlescent application technology
As a high-brightness material that increases the added value of products, pearlescent materials are currently used in the printing industry with good results. They can improve the vividness of the color of the products and can also change the color rendering effect.
Pearlescent materials are mainly divided into the following categories:
1. Pearlescent powder: Pearlescent powder is divided into ordinary powdery pearlescent materials and pearlescent balls dispersed with soft resin. The colors are mainly silver, bright gold, metallic, rainbow interference colors and chameleon series. Among them, pearlescent powder is based on the direction of use There is a difference in particle size from the use effect. The smaller the particle size, the stronger the hiding power of pearl powder; the larger the particle size, the stronger the gloss of pearl powder; in the printing industry, the particle size has strict requirements, and small particle size can be used For offset printing, larger particle size can be used for flexo and gravure printing, and has better results.
2. Pearlescent paste: Pearlescent paste is a high-viscosity viscosity pearlescent material, which is more suitable for mixing with offset printing ink, has excellent hiding power and good gloss, and is suitable for offset printing;
In terms of the use of pearlescent materials, there are the following methods:
1. In the offset printing, choose pearl powder with a smaller particle size and printing ink mixed in a certain ratio for printing; or use a water-based, uv glazing system to add a certain percentage of pearl powder to the glazing oil for glazing. Coated, the effect is better; pearlescent paste and offset printing ink mixed in a certain proportion for printing can greatly improve the brightness of the ink and the effect of Zhu Guang;
2. For gravure and flexo printing, use pearlescent powder with the particle size corresponding to the printing plate and ink to mix and use;
3. The pearlescent effect is related to the bearing capacity and mixing ratio of the ink to pearlescent;
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