Characteristics of several high-tech inks (3)
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In the current situation of green environmental protection, the research and development of packaging and printing is more suitable for environmentally friendly products. Food packaging should comply with CEPE standards in industry standards. From the ink point of view, it is necessary to continuously solve the content of harmful substances such as lead, benzene, aromatic compounds, ethyl glycol and the like in the ink to ensure the safety of foods and articles and the health of the printing personnel. Judging from the results achieved in the ink industry, the results are still very encouraging. In 1974, lead was removed from ink pigments; in the late 1970s, cellosolve (ethyl glycol) was removed; in the early 1980s, toluene in food packaging instructions was removed; in the late 1980s, related benzidine yellow Pigments; in the early 1990s, the use of phthalic acid plasticizers was reduced. In the initial stage of development of cationic inks (in the mid-1980s), the content of some of the above-mentioned harmful substances did not meet the standards of regulations. For example, benzene is a by-product produced by the production of cationic inks, and later by-products produced by the illumination of initiators are not Popular aromatic compounds, etc., are among the prohibited ingredients listed in the Printing and Food Packaging Ink Code. Therefore, cationic inks have not been widely used in the initial stage. Until now, there are still some units that have adopted a wait-and-see attitude, but after continuous improvement, the content of these harmful substances has finally reached the industry standard. Such as benzene, in the current production of cationic inks, its content is extremely low, using ordinary analytical techniques, can not be detected at all. Many test results for the print and printing environment also showed that no benzene was found. The content of these materials is generally in the range of parts per billion (usually a single digit), which means that the package using the photoinitiator no longer produces benzene. Looking at the development prospects of cationic inks, it is believed that most printing units will still use cationic inks with excellent properties. Although some customers still have plans to abandon the use of cationic inks, it has shown great advantages in the printing process and will certainly be recognized by customers. We believe that with the development of technology and the improvement of the ink industry, some shortcomings of cationic inks will surely find a good solution, as well as the excellent records mentioned above. Therefore, we must have a positive attitude and technical direction for these, and better adapt to the new standards.
(1) Cationic coating adhesive
Gravure printing is fast, and there is no drying (the presence of solvent) when it is coated with an adhesive, or it takes a day to cure it to a certain strength. In flexographic printing, the adhesive is generally applied to the printing unit, and the film is cured and cured at a normal printing speed. Within a few minutes, the film of the printed product can be cured, and it is also cut to the finished product on the printing machine. And then hand it directly to the customer. In this case, the use of the UV adhesive does not cause a problem that the solvent volatilizes to cause a harmful odor. The printer uses a newly developed white pigment binder to remove the traditional solvent problems caused by backing, followed by a white ink coating. Solving the problem of the original solvent retention, it is now easy to reduce the residual solvent per square meter to a very low level with a cationic binder coating. Such a film can now be used on materials such as polyethylene, polyether, and metal base.
(2) Cationic ink - shrink film
The majority of the shrink film market is dominated by solvent-based gravure printing, and very few are obtained by solvent-based flexo printing. In fact, anhydrous ink is used. Flexographic printers have found that the ink system that achieves the desired quality in flexo printing is a UV curable ink that has no solvent volatilization and print consistency. However, when the shrinkage amount reaches 70%, the free-volatile ink and the mixed-drying ink exhibit poor adhesion. Cationic inks have passed this required test and become the unique ink system for OPS, PVC and OPP materials. The advantages of cationic inks in management and storage are obvious.
3. Electronic ink
With the continuous networking and digitization of printing technology, digital offset printing has begun to spread at home and abroad, and a new type of ink-electronic ink suitable for digital offset printing machines has also been used. Electronic inks contain charged liquid ink particles that enable electronically controlled printing of the position of the particles in digital printing. Electronic inks can reach very small particles (1 to 2 microns), so small particles enable printing to achieve higher resolution and smoothness, sharpening the edges of the image, resulting in a very thin image layer. Electronic inks have now played a role in the following areas. (1) Standard basic color CMYK; (2) The wide color gamut six-color setting adds orange red and purple, which makes the color reproduction ability much higher than the original four-color color reproduction ability; (3) PANTONE-compatible Indigo Spot color system; (4) opaque white coating of colorless printing material; (5) fluorescent ink. Indigo's color digital offset presses offer a unique combination of features, all using electronic inks (ie Indigo's unique liquid inks).
Electronic inks generally have the following advantages:
(1) High brightness, high definition and durability. Manufacturers use the same ingredients as traditional inks, but only charged inks to make electronic inks. Therefore, electronic inks are similar to traditional inks printed on paper, but they have high brightness and contrast when matched with paper. And can have a 180 degree viewing angle. (2) Low energy consumption. Once the white paint particles are driven to a state where an image has appeared, the image may disappear (because there is no additional energy support), but this does not exist for electronic inks. (3) Strong printability. Electronic inks are suitable for almost all materials and can be printed on textiles, paper, plastics and many other materials. We know that the LCD display is displayed on the glass, but it is heavy and brittle. Electronic inks can be displayed on plastic surfaces, making them ultra-thin, flexible and not fragile. Electronic ink is an ink. If someone walks into the laboratory and accidentally is splashed by electronic ink, then this person becomes a walking monitor.
Printing with electronic ink is very easy. For example: it can be used for web printing, and it is estimated that it will be used for glossy advertising paper and other large-format labels in the near future. Today, electronic inks are beginning to work with other electronic devices. For example, E-Ink recently announced that it will work with IBM to develop a world-class SVGA electronic ink display. It is estimated that electronic ink displays may be put on the market in the last year or two. Electronic inks are also said to be in line with the emerging revolutions in the publishing industry in the field of printed electronics. Here, E-Ink and Lucent Technologies has produced the world's first fully printed display. Their ultimate goal is to print on one sheet of paper with one side and electronic ink on the other.