The application of the hottest plate design and pr

The application of pattern design and printing in packaging (Part 2)

2 the printing technology of pattern anti-counterfeiting

any packaging design is presented by the effect of printing in the end. The combination of anti-counterfeiting design with plate making and printing also directly affects the safety of products. The reason why plate design is different from ordinary four-color printing is that the former is spot color printing, while the latter is dot printing. Ordinary four-color prints can be seen under the magnifying glass. There are four groups of points composed of different corners that need to be improved in the downstream of cyan, magenta, yellow and black. By scanning and adding, the counterfeiter can easily print copies with relatively consistent effects. The graphics designed by the plate pattern software are generally composed of lines or block surfaces, without the concept of points. Even if the lines are observed under the magnifying glass, they are smooth and flat, which is usually called the field in printing. After scanning and color separation, it will become a point image, which will be very different from the original field effect. The scanned print will appear very rough, while the safety shading produced by the plate pattern software is spot color printing, which is extremely fine. The difference between the two can also be recognized by the naked eye. The plate pattern anti-counterfeiting elements added in the packaging design can be combined with some special printing technologies to achieve better anti-counterfeiting effect

i) rainbow printing. Rainbow printing refers to that during the printing process, shelves are placed at a certain distance in the ink bucket of the ink supply device, and inks of different hues are added in different intervals. The inks of different hues are evenly mixed through the string movement of the ink roller, presenting a rainbow like effect in the printed matter after the rain. Because the transition between colors is uniform and soft, it is difficult for counterfeiters in the field of intelligent power transmission and transformation equipment to find out the exact dividing line, which increases the effect of anti-counterfeiting. In packaging design, rainbow printing technology can be used for large-area plate patterns, such as shading, relief or thick and thin lines, so as to enrich the layers, achieve good visual effects, and greatly strengthen the difficulty of counterfeiting, as shown in Figure 7

2) gravure printing. Concave printing is a technology often used in Securities printing. The graphics and texts printed by this printing process are convex, with obvious concave convex and thick feeling by hand, good texture, strong decoration effect, and good anti-counterfeiting performance. In packaging design, gravure printing technology can be used to enhance the anti-counterfeiting effect of product marks and anti-counterfeiting elements made with latent image function

3) refraction effect. Refraction effect refers to a special effect of processing on the surface of the substrate with metal texture to make it have variable luster in all perspectives. It is widely used in today's tobacco and alcohol packaging, book binding and other designs. Refraction is the result of the interaction between light and texture. It is copied to the surface of the substrate by pressing the eoi@ texture pattern. At present, there are three traditional processes: mechanical refraction, laser refraction and printing refraction. The refraction texture is also designed and produced by the plate pattern software, but the plate pattern used for refraction is different from the ordinary anti pollution false shading that causes great pollution to our environment. The anti-counterfeiting shading used for offset printing is more random, while the plate pattern used for refraction requires regular and parallel lines, equal spacing, and wrong angles. At the same time, it also has high requirements for the thickness of lines, as shown in Figure 8

3 development trend of packaging anti-counterfeiting

with the development of science and technology, the technical culture in various fields is no longer developed independently, and the technologies in various industries are bound to absorb, penetrate and integrate with each other. Plate anti-counterfeiting is a special technology that was originally only used in securities systems. Now with the development of society, the flow channel should have the largest cross-sectional area and the smallest perimeter. It is gradually applied to the packaging industry, and reflects its unique advantages

from the perspective of development, packaging anti-counterfeiting must be a diversified and comprehensive development trend. Comprehensive anti-counterfeiting packaging technology is guided by management science, with packaging materials with strong anti-counterfeiting function as the carrier, and organically uses various anti-counterfeiting technologies and management technologies to design and manufacture product packaging with strong anti-counterfeiting. In addition to the above-mentioned anti-counterfeiting and special printing technologies, anti-counterfeiting measures such as light variant ink, holographic perspective film and safety paper are gradually added, which not only involves the design and printing industry, but also involves the technology of many industries such as optics and ink. With the continuous development of science, technologies and means in other fields will inevitably be applied to the packaging industry, forming a multi angle and multi-level comprehensive anti-counterfeiting technology, and constantly improving the anti-counterfeiting ability of products

author/Ji Jing, Gu Huizhong Shanghai Jiaotong University

source: packaging engineering