2Research on Color Management of Plastic Flexible Packaging Printing
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2. Tone reproduction characteristics: The reproducibility of plastic printing is not as good as that of offset printing. The smallest 3% reproducible online shop will generally expand to more than 10%, and the dots will be pasted at about 90%. Less than 10% of the outlets are easily lost, making plastic flexible packaging at the tone level greatly limited, but its consistency in the field color is better, suitable for spot color printing. Relative contrast, also known as print contrast, or K for short, is an important parameter for controlling the tone of an image.
3. Plastic ink: In printing image reproduction, ink viscosity is a very important parameter. General plastic printing uses water-based inks, which have the least viscosity, are like spray paint, contain many solvents, and have good fluidity and transferability of colloidal fluids. Offset and embossing generally use sticky inks, which are very viscous. The viscosity of the plastic ink is small, and there is no ink distribution and ink supply mechanism in the inking device. After the ink roller moves, the amount of ink transferred to the surface of the paper is reduced, resulting in changes in the tone and tone of the printed image, and the color saturation is insufficient. Visual effects are often not bright enough.
4. Anilox roller transfer ink: The anilox roller needs to be thoroughly cleaned in time, its ink transfer performance is stable, and it is convenient to transmit ink volume control.
5. Printing Suitability of Substrates: Plastic printing, the surface tension of the substrate is the first factor to be considered first. Untreated plastic films have very low surface tension and generally require corona treatment to increase the surface tension of the plastic substrate. The printing suitability of plastic printing lies in the plastic surface. The plastic surface is smooth, chemically inert, non-hydrophilic, not easily wetted by ink and solvent, and the lower the surface energy of the high molecular polymer, the smaller the surface tension, and the less susceptible it is to Liquid soaked. The surface energy also affects the adhesion of the ink to the printing material, and the degree of spreading of the ink on the surface of the plastic film, thereby affecting the color reproduction effect.
Fourth, the implementation of plastic printing color management
Color management means that the colors from the input of the equipment to the printing of the product remain the same, and the gradation and color of the original are correctly reproduced, and the effect of what you see is what you get is truly achieved. Based on these characteristics of plastic printing color management, the implementation of the following points.
1. The problem of increasing the value of outlets. In the pre-press process, appropriate dot gain compensation can be applied to the RIP process by making appropriate dot gain compensation curves, so that the final dot expansion from plate making to printing is constrained within a reasonable range. The creation of dot gain compensation curves can be accomplished in a variety of ways, either manually or through software. Currently, there is a mature curve production software on the market. The Alwan ColorHub color hub helps the different printing processes to improve the color matching degree, print quality and production efficiency through an automatic color conversion server. Its powerful automated plate curve creation software requires only simple numerical settings, and can quickly and easily output the dot expansion compensation curve for most RIP software on the market.
2. For tone reproduction problems.
(1) Make reasonable pre-press compensation for image files during pre-press design and make adjustments to high-light or dark-tone adjustments.
(2) Comprehensively adopting two different screening technologies, the amplitude modulation range is from 10% to 90% of the part adopts the amplitude modulation network point, and the other part can adopt the frequency modulation network point for screening, so that the small network points are restored and reproduced, and the dark tone area is increased. The tone level enhances printing contrast.
(3) When designing prepress, it is necessary to predict areas that are easily lost and improve the predictability of color. Using the design software such as Photoshop's plug-in function, such as GMGColorplugin software, you can freely set the starting point of the lost network, in advance to predict the net effect after printing.
3. For ink ink saturation is not enough. The monitor uses RGB three-color light, and the printer uses the color principle of CMYK four-color subtraction. The gamut space that the display can display is generally larger than the color space that can be printed, ie what is seen is not obtained. Many designers like to use high-saturation colors and see bright colors on the monitor. The prints are gray and do not achieve the desired results. Therefore, in color design, designers can use PANTONE standard color cards and color optimization software, can complete the standard to non-standard, standard to standard, standard to custom perfect conversion, the software itself has many integrated features, such as high security True color separation, spot color reproduction, ink optimization and other functions, for process printing, can greatly improve the true reproduction of color, improve the consistency of the expected results.
4. For the anilox roller transmission problem. Because the current production color of the brand is ultimately presented to the consumer through the brand package, the final printed product is the basis of the entire color management process. Regardless of the previous display, or the middle of the printing equipment or printing equipment, the final print should be used as a color basis. Therefore, the color stability of the printed matter as the basis of the color of the entire process is significant. In order to achieve the color stability of printing, the core is the standardization of the printing process management, and the strategy is the whole process of thinking and implementation in steps. The link control of the ink is based on the premise that the consistency of different batches of ink is guaranteed.
5. For a variety of different substrates, set up an information package, including specific parameter information, such as metallic color, matte effect, embossing and other information about the scope of printing capabilities, ink selection, print contrast, ICC color, color Target and material related information. Understanding the significance of the printing process is very large. It can make the results of printed products closer to "what you see is what you get", reduce the production costs of the company, and increase the production efficiency of the printing shop.
The choice of materials is an important factor affecting the color, printing is often proofs from the screen soft proofing, and this does not reflect the selection of substrates. The emergence of the latest Pantone Live has solved this bottleneck problem. Pantone Live is a color service based on cloud computing. The entire spectrum of data is stored in a security-based "cloud" that provides access to the brand's color standard even if it is accessed. Brand color standards are a major part of Pantone Live. These color standards are obtained using real ink on real substrates through real printing processes. This allows brand owners to predict how the company's proprietary colors will be reproduced on a wide variety of substrates and share them in a global packaging design and printing supply chain.