This category includes some different types of Beauty Sponges. Each Makeup Sponge is smooth and soft so it is perfect for applying cream or liquid products without hurting your skin. Each Makeup Sponge Blender is made from non-latex foam and will expand after watered. The flat side of the Sponge Puff allows for a flawless foundation.The rounded side allows for an even and fine finish. And the poined tip of the Beauty Sponge is great for getting those hard-to-reach areas.
Correct understanding of the characteristics and uses of fluorescent inks
The so-called fluorescent ink is an ink containing a fluorescent pigment. Layouts printed with fluorescent inks have the property of converting short-wave UV light into longer visible light, which in turn reflects attractive colors. Therefore, it has certain anti-counterfeiting effects. The colorants in fluorescent inks, ie, pigments or dyes, are different from common colorants in that they not only reflect visible light, but also absorb short wavelength portions such as violet, blue, and green light rays, and reflect visible fluorescent light, causing colored substances. Fluorescence is exhibited upon excitation with sunlight or ultraviolet light, so its colored material produces a very pleasing fluorescent effect. Whether the colorant can produce a good fluorescence effect depends mainly on the presence of certain atomic groups in its molecular structure. After the luminous fluorescent ink is printed, ultraviolet rays illuminate the printed graphic and it will become long-wavelength visible light reflected, so it can also produce vivid colors in dark places. This is the raw material zinc, cadmium, and yttrium. The result of the action is also a basic characteristic of a luminous type fluorescent ink. Colorless fluorescent inks can be formulated with other 4-color inks with other colored fluorescent inks. However, the color and brightness of the light will be different depending on the color and component of the added ink. Improper deployment will also affect the ink performance. Since the wavelengths of transmitted light of the red and yellow inks are greatly different from the wavelengths of the ultraviolet fluorescent lines, the generated fluorescent colors are obvious, and when the green fluorescent ink is printed on a light background or a white background, only the ink layer reaches a certain thickness. After that, you can get better fluorescence effect. The application of fluorescent inks in color prints is good, so it is widely used in securities, stamps, trademarks, labels, scratch cards, invoices, navigation marks and other packaging and decoration printed matter, and its application prospect is extremely broad.
Several types and varieties of fluorescent inks
Fluorescent inks are classified according to the type of printing process: silk screen fluorescent ink, gravure fluorescent ink, offset fluorescent ink, embossed fluorescent ink and flexo fluorescent ink. According to the ink performance, fluorescent ink is used for the printing of general products, and the fluorescent security ink is specially used for the security printing of special products. When using, according to the characteristics of the printing process design, select the corresponding fluorescent ink, in order to ensure that the printing process effect is not affected. Fluorescent ink is divided into invisible security ink and tangible security ink. Images printed with invisible fluorescent anti-counterfeit inks are almost invisible to the prints, and when viewed obliquely on the printed surface, only a faint, slightly glossy print can be seen. Inks are often used to print products such as scratch cards, book covers, and invoices. When using ultraviolet light to print graphics, bright clear, colorful fluorescent images will be clearly seen. Since the invisible fluorescent ink is transparent and colorless, it is difficult to clearly observe with the naked eye during printing, which poses a certain degree of difficulty for the plate edition. According to the past experience of the embossing process, when printing invisible fluorescent inks, it is best not to perform car wash color change immediately. Instead, the car wash color change should be performed after the plate edition is completed. This will help improve the printing school. Edition efficiency. The use of tangible fluorescent ink for printing, the process is relatively simple, the color version of the plate printing and printing process control is relatively straightforward, so the layout is easy to register, the printing process of the ink is also easy to maintain uniform. Choosing the right fluorescent ink to print different products is crucial to the anti-counterfeiting effect of the product. If the ink type is not suitable for the selected material, the printing anti-counterfeiting effect is likely to be poor, and even the anti-counterfeiting effect will not be achieved. For example, a colorless fluorescent blue ink is overprinted on a golden background, because the fluorescent blue ink can exhibit blue light under the irradiation of ultraviolet light, and then mixed with the background golden light, because the yellow light and the blue light complement each other, The white light is present. This is the result of the absorption of some short-wavelength blue light by the medium-long-wavelength golden light of the spectrum, so that the color that the fluorescent blue should present is hardly visible, so that its anti-counterfeit printing cannot achieve good results. Different formulations can be used to obtain fluorescent inks of different color varieties. For example, ultraviolet fluorescent inks containing visible fluorescent compounds excited by ultraviolet rays are added to the ink, and visible light such as red, yellow, green and blue can be displayed under the irradiation of ultraviolet rays. If an infrared fluorescent ink having an infrared-excited visible fluorescent compound is added to the ink, green visible light can be displayed under the irradiation of infrared rays. The dual-wave invisible fluorescent ink exhibits different fluorescence color responses under different wavelengths of fluorescent light. The long wave shows a fluorescent color, and the short wave shows another color. Now some products in order to improve the anti-counterfeiting effect of ink, it also uses fluorescent encryption security ink. This kind of ink is different from ordinary fluorescent inks. Its ink uses specific encryption components and has a personalized anti-counterfeit effect. When it is necessary to identify the authenticity of a product, as long as a special detection instrument is used, the authenticity of the printing can be identified. Therefore, the anti-counterfeiting process is more effective.
Fluorescent ink printing process technology several control essentials
Fluorescent ink is obviously more expensive than ordinary ink. Therefore, from the point of view of anti-counterfeiting process, or from the perspective of the cost of ordinary printing process, the layout of printing fluorescent ink should not be designed too large, especially the field layout is not suitable for printing fluorescent ink. . Therefore, the fluorescent ink is more suitable for printing a small area of ​​text, logos or patterns. For products printed with fluorescent ink, the effect of printing should be fully taken into account in layout design. For example, the fluorescent effect of tangible fluorescent ink directly printed on white paper is not good, and the layout of overprinted fluorescent ink is designed on a light background color. better. From the viewpoint of product anti-counterfeit, the use of invisible fluorescent ink to print small letters, letters, etc., and the partial strokes of letters and letters from the font library will be deliberately deformed to form an implicit and personalized one. Anti-fake mark, improve the printing plate anti-counterfeiting effect.
Pay attention to choose printing paper according to the characteristics of fluorescent ink. Different papers have different effects on invisible fluorescent inks. Papers with pale or colored lines tend to reduce the brightness of the ink and affect the color rendering effect. In addition, the whiter the paper, the higher the degree of treatment of the fluorescent brightener by the paper, so that the fluorescent whitening agent will emit blue-white light under the ultraviolet ray, and the color development of the fluorescent ink will form a certain degree of interference, resulting in a significant weakening of the fluorescent effect. , affect the process effect of fluorescent ink. Therefore, the invisible fluorescent blue ink is not suitable for printing paper containing a strong optical brightener. The yellow and magenta fluorescent inks have the strongest visual impact. They can use high-gloss papers and paperboards, such as coated paper and glass cards. The fluorescent effect is ideal.
Pay attention to the reasonable mastery of the printing process. Looking from the appearance of the fluorescent ink, the original fluorescent ink color looks deeper, but it is very light after being printed on the substrate. This must be paid special attention when adjusting the ink so as not to waste the blind transfer. Because fluorescent pigments have a hard texture and are not easy to be rolled, they have poor stretchability during the printing process. Therefore, when printing layouts with fluorescent inks, it is better to print a layer of virgin oil on the background color before overprinting. The printing effect is better. For the printing of acidic paper, it is advisable to add a trace amount of dry oil to the ink in order to improve the printing process effect, ensure that the product is dried at the right time after printing, and prevent the printed product from appearing dirty. In order to improve the printing performance of fluorescent inks, it is sometimes necessary to appropriately increase the viscosity of inks. For example, under high-speed and high-temperature printing conditions, resin oils and varnish No. 19 can be generally used. However, if paper or cardboard that is easy to lose hair is printed and printed under a low temperature environment, the viscosity of the ink should be appropriately reduced. If the transparent thin film material is printed with a fluorescent ink, the white ink may be printed first, then the fluorescent ink may be printed, so that the printing effect of the fluorescent ink can be better improved.
Clean the inking system to prevent cross-talk and color cast. According to past printing experience, when printing fluorescent ink, the inking device of the machine, including the rubber roller, the ink fountain and the printing plate should be cleaned, and then the ink of the color to be printed should be applied to the ink fountain and the rubber roller for operation. Wash once again, so that the machine's ink system can be cleaned more cleanly. When printing, it will not be due to the color remaining on the original machine, and the color of the fluorescent ink will be mixed to produce the phenomenon of cross-color development, resulting in the color of the fluorescent ink is not pure. And there is color cast. If conditional, printed fluorescent inks may additionally employ a set of unused ink rollers, which is conducive to improving the quality of printed colors. In particular, the surface of the embossed rubber roller is difficult to clean even if there is a slight scratch on the surface. If a set of rubber rollers is specially used for printing color equipment, it is more scientific and reasonable.
Pay attention to the control of ink deployment technology. The use of a small amount of color ink and fluorescent ink mixed deployment, can improve the color and concentration of fluorescent ink, such as fluorescent orange red adjustable amount of fluorescent orange, gold red; fluorescent red light can be adjusted to the right amount of pink and so on. It is worth mentioning that fluorescent inks should not be mixed with other common inks as much as possible. Otherwise, it is easy to reduce the fluorescence effect of inks. The screen printing fluorescent ink can be mixed with the phosphor ink, and its color effect is better. If the bottom color tone of the fluorescent ink is printed, the darker the fluorescent effect is, the more attention should be paid when dispensing the ink.
Focus on controlling printing pressure. Since the inorganic fluorescent substance of the fluorescent ink is crystallized, if the printing pressure is too high, the crystal will be easily broken and the light emission brightness will be reduced. Therefore, the relief printing process is not suitable for printing with a metal plate, but is suitable for softness and glossiness. Good printing pressure can keep the resin plate saturated with ink, and care should be taken to print with as little pressure as possible. In fact, the use of silk screen, gravure and other processes printing fluorescent ink is more appropriate, the printing ink layer is thick, the printing plate layout fluorescent effect is better.
Pay attention to control the printing speed. For the fluidity of the fluorescent ink, the drying performance is relatively slow. When printing a large area of ​​the layout, because the coated ink layer is relatively thick, if the ultra-high speed printing is used, the ink layer can easily exacerbate the abnormal spread of the ink layer. There was a stencil defect. Therefore, I believe that the printing of fluorescent ink, in order to maintain a moderate speed printing is appropriate standards and certification, it can also maintain a relatively stable printing ink concentration.
Ink adjustment for letterpress invoice stamps printed with gold-red fluorescent ink. In the past, when the author produced the embossing process, gold red fluorescent ink was used to print tax invoices on anti-counterfeit watermark papers. In the course of the production of the supervisory seals, there was a serious problem with paper naps and hair loss; the layout was easy to get dirty, and the paste was of poor quality. In particular, in the cold winter season, the ink has a large consistency and the film is strong and sticky. The above problem is even more serious. If measures are not taken to adjust the flowability and viscosity of the ink, it is difficult to maintain normal printing. Later, by adding 6# varnish to the ink and diluting it, the printing quality failure phenomenon is better eliminated, and the printing production efficiency is improved.
Our company's offset printing press uses offset colorless fluorescent ink to print the initial label of the scratch card. It has frequently experienced quality failures such as pasting, dirty printing, and color unevenness, resulting in low printing efficiency, high product failure rate, and high consumption. Outstanding issue. After careful observation and analysis, the author found that this is due to the thicker ink, high viscosity, poor fluidity, the ink layer is prone to accumulation and drying, and later we added a trace of detackifier to the ink to reduce the viscosity of the ink, increasing After the fluidity of the ink, the above-mentioned printing defects are effectively eliminated immediately, and the printing efficiency and the printing quality are also improved synchronously.
Pay attention to the reasonable arrangement of fluorescent ink printing color sequence. After the fluorescent ink is printed, only the fluorescent effect is fully exhibited, which is the purpose of the printing process. Therefore, in the printing of fluorescent ink on non-transparent materials such as paper and cardboard, the proper arrangement of the color sequence must be considered. Whether it is a colored or colorless transparent fluorescent ink, the fluorescent ink can be printed directly on white paper or printed on the ground color. However, the bottom color layout must be printed first, and the layout of the fluorescent ink must be printed last. Otherwise, the fluorescent ink will be masked by other colors and affect the color rendering effect.
Pay attention to the reasonable control of the amount of ink coating. Printing process practice shows that the thicker the printing ink layer of fluorescent ink, the stronger the fluorescent color rendering effect, and the more striking the imprinting. However, the thickness of the ink coating must also be controlled to a suitable degree. The principle of lithography is that the layout is not stenciled or dirty. It neither wastes ink nor ensures the color effect of the fluorescent ink. Requirements, this is also the basic principle of the process.
Pay attention to choose the appropriate post-press processing method. Generally speaking, printing failure analysis and exclusion of fluorescent ink products, it is best not to carry out the coating process, but can not use the film decoration process, otherwise, on the one hand prone to fade, discoloration, on the other hand affect the fluorescence The color effect. If you consider the characteristics of the product's use, you need to apply a protective film layer, you can use UV light varnish coating, in order to enhance the print's light, wear and prevent the effect of discoloration. For some special products, in order to improve the decorative quality of fluorescent ink printing products, localized hot stamping of electro-aluminum may be adopted, and the embossing process may be used to set off the product to improve the product's beauty.
In summary, fluorescent ink is different from general ink. Its superior performance and color rendering effect determine its color separation in high-grade cigarette, wine, medicine, cosmetics and other packaging products, as well as securities, stamps, trademarks, labels, and scratch cards. , Anti-counterfeit printing and other broad application market. As long as we establish innovative ideas in process design, from the best design of the printing layout subject theme to the appropriate use of other post-printing processes; from the rational selection of printing materials, to the full control and control of printing process technology, so that Without losing the good use characteristics of fluorescent ink, improve the printing process level. 
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