Introduce several screen printing anti-counterfeiting methods (2)

Third, anti-counterfeit screen printing process

With the development of high technology and people's demand for high-quality packaging products, the packaging industry has carried out technological innovation in recent years. Multi-color offset printing machines, screen printing machines and other printing equipment used in combination with each other. The mutual penetration of various printing processes makes the printing products more varied and colorful.

1. Offset, screen printing combination printing

The design of high-grade packaging prints has a large area of ​​color blocks, continuous multi-color sequence and complex lines, patterns, etc., single printing brings a certain degree of difficulty. If you use offset printing, screen printing, it is best. Screen printing is characterized by thick and uniform ink, and it is best to print large-area solid color patches. The feature of offset printing is pressure flatness, which is most suitable for printing four-color meshes to reconcile complicated lines. This is an obvious way to avoid weaknesses. For some demanding and complex prints, offset printing, embossing, screen printing, and other multi-process printing can also be used. In short, the more complex the printing process, the greater the difficulty of printing and the better the anti-counterfeiting effect.

2. Transition color printing

Transition color printing is also called cross-color printing. Screen printing can be used to pour a variety of hue inks onto the printing plate according to the requirements. After the scraper is used, some inks are mixed and then printed on the substrate. It can be printed on a variety of colors at once, and the intermediate transition layer is soft, which can play a security role. If such a process is applied to large-area shading, its anti-counterfeiting effect will be more prominent.

3. Special gloss security printing

Special glossy printing is a new type of printing technology that has become more popular in the packaging printing industry in recent years. Special gloss refers to the printed products printed by this process, and the surface gloss effect is different from the gloss effect reflected by ordinary ink or printing paper. The printing processes mainly include: metallic luster printing, pearlescent printing, dioptric printing, fluorescent printing, variable gloss printing, laser holographic iris printing, crystal luster printing, imitation metal etching printing, and matt printing. The characteristics of these special glossy printing processes are that the printed packaging is brilliant, colorful, colorful, and unpredictable. It not only improves the product quality, increases the added value of goods, and enriches the diversity of the packaging products, but also has a certain degree of particularity. As a result, it also has a relatively safe anti-counterfeiting effect. At present, most of the above processes use a screen printing process.

4. Laser holographic iris printing

Laser holographic iris printing uses laser holography to make stencils in shockproof rooms and transfer them to certain carriers through certain pressure. Under the irradiation of a 45° light source, it can produce unique effects and three-dimensional effects of colorful and colorful. The strong three-dimensional image is deeply favored by consumers. At present, cold-press coating and hot-stamp printing are two kinds of processes for direct printing. Its craft is more complicated, it is very difficult, anti-counterfeit effect is very good.

Fourth, printing paper security

Anti-counterfeit paper printing preferred watermark paper. Watermarked paper is a paper in the manufacturing process, the use of technical means to the required logo, pattern, etc. in the paper. For example, embedding a metal wire in paper, which is called a security thread, is not easy to see in normal circumstances, and can only be seen by transmitting strong light. Most of China's renminbi is printed using watermark paper. Now the use of a special type of ink in the security printing—waterproof printing mark ink, is printed on ordinary copper plate paper, and the watermark effect is vivid, and is mainly applied to wine packaging.

Fifth, security printing substrate

With the rapid development of high technology, papermaking technology is also constantly developing. The produced material can be reflected in a variety of colors under different light pearl paper, laser film paper, laser washed paper, washed light silver dragon, washed silver silk dragon and other special security paper. These substrates are the best and most ideal anti-counterfeiting materials in our security printing.

With the continuous development of the times and the progress of science and technology, we believe that the high-tech process of security printing will certainly play an increasingly important role.