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Types of special gloss printing for packaging (Part 2)

refractive printing

refractive printing is a new printing process rising in the early 1980s abroad. It can produce novel and peculiar metal mirror refraction effect on the surface of printing. Refractive printing is produced by embossing, which makes the printed matter reflect the changes of light from multiple angles according to the principle of light diffusion, and makes full use of the surface state of the paper, so that it contributes to the diffuse reflection of light and achieves better refractive effect. On the basis of refraction, according to the principle of stereoscopic perspective, design specific or abstract patterns, and comprehensively apply a variety of refraction patterns, which can make the picture produce a hierarchical stereoscopic image. This process can make the products shine and dazzle on the metal paper, with gorgeous color sense and strong three-dimensional sense

the process of refraction printing is as follows: first, according to the design needs, select regular geometric lines and texture patterns as the refraction diagram, which are generally straight lines or curves to actively enhance their development and combination, and it is not suitable to choose thicker or too thin lines. Generally speaking, the ratio of solid line to blank is 1:1, and the block pattern or gap is too large or too small, and the distribution is lack of regularity. Practice has proved that it cannot print refractive effect, so it should not be used as refractive pattern. Then make an imprint plate, and select an appropriate die-cutting indentation machine or a printing machine with a certain pressure for cold pressing according to the unit pressure required by the size of the light grain area. It should be pointed out that copper plate should be used for the selection of embossing plate material, because the fineness and India resistance of copper plate material are much better than zinc plate. In the refractive printing process, the choice of substrate material is very important, which plays a key role in the refractive effect of printing. Practice has proved that the more metallic the selected substrate material is, the better the smoothness is, the greater the reflection coefficient of light is, and the better the refraction effect is. Generally speaking, large-scale printing of silver and gold can produce refractive effect. However, the best effect is to use smooth metal cardboard and electrochemical aluminum materials

laser holographic iris printing

laser holographic iris printing is another category of special gloss printing. Using this technology, holographic images with three-dimensional sense and gorgeous colors can be made into metal stampings, and the holographic information stripes on the die can be transferred to the aluminized film by heating and pressing to form products. The biggest feature of laser iris is that it can reproduce a three-dimensional image under natural light illumination, and the color of the image changes with the movement of the observer's position, such as the seven rainbow shape, which is favored by consumers

laser holographic iris printing is a multi-level production process. First, the "Manuscript" is made in a fully enclosed, vibration free holography and photography laboratory, which also includes pattern design and making mother hologram and transfer hologram, which is a special white light "Rainbow" hologram; Then, by laser exposure, a concave convex holographic interference relief pattern is left on the special photoresist coating of the carrier material; Then a nickel coating is plated by electrolysis, which forms an impression die

The molding process is the key of holographic printing. If several machine tools or operators work at the same time, the carrier material used is PVC film or polyester film, and its back is formed into a mirror by vacuum atomization aluminum plating, so that the original transmission hologram becomes a reflection. Under high pressure, holographic micro relief is copied and transferred from the impression die to the base material. This molding process is somewhat similar to that of record pressing, except that instead of transferring acoustic patterns, it is a comprehensive light wave structure. Of course, the principle of refractive printing is also different

laser holographic iris printing integrates the latest achievements of laser, holography, electrochemistry, precision machinery and other disciplines. It is a comprehensive high-tech printing process. The production environment and conditions of this technology are very demanding. Its anti-counterfeiting effect is often obvious in the name, specification, model and quantity of non main equipment (production line). At present, it has been widely used in credit cards, securities and anti-counterfeiting packaging. Iris with diffraction patterns, also known as laser foil, has unique colorful and varied patterns

matte printing

matte printing is also called weak gloss printing, matte printing, matte printing. The surface of the print is hazy and feels like frosted. The effect can be achieved by using matte paper, matte ink, matte coating, matte glazing and other processes

1. Matte paper can be made by coating with matte paint, which has good printability. However, the matte effect is slightly worse after the ordinary ink is superimposed. According to relevant sources: Recently, Japan has produced a kind of matte paper, which can show excellent matte effect after the ordinary ink is superimposed

2. Matte effect can be obtained by direct printing with matte ink. The configuration of matte ink can draw lessons from the deployment method of traditional blackboard paint. The ink should be prepared by adding less desiccant, more filler, mineral oil, emulsified oil and other methods. Some printing enterprises in Japan print some high-end products on matte ink substrates, then make some patterns into plates, and overprint them with high gloss ink or UV glazing paint, forming a contrast between strong and weak gloss, which is more elegant

3. After printing with ordinary ink, covered with matting film is a simple way to obtain the matte effect of printing with an applied pressure of 13kn. Many domestic manufacturers have adopted this method, and the overall matte effect is very good. And it can be hot stamped with anodized aluminum, which makes the product more high-end after hot stamping

4. Although it is better to obtain matte effect by covering extinction film, the printed matter after covering film can not be recycled, resulting in social hazards. At present, water-based glazing process is being promoted in developed countries to obtain matte effect. Water based glazing can be applied by glazing machine and then dried. Water based glazing has the characteristics of wear resistance, moisture resistance, water and oil repellency, and can burn foil. At the same time, it is non-toxic, odorless and environmental friendly, especially suitable for use in the field of food packaging

The rapid development of high technology, the wide application of comprehensive technology and the continuous renewal of people's ideas have brought China's packaging and printing into a new realm. With the progress of the times, I believe that special gloss printing, a new printing process integrating various technologies, will play an increasingly important role in the field of packaging and printing

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