In recent years, consumers are no longer treating packaging only as a protective product, but have begun to increase their demand for beauty. This has led consumers to be discerned and attracted by high-end printing and packaging, and stimulated the desire to purchase goods. This is the special glossy printing.
Special glossy print concept special gloss
Printing is a comprehensive printing technology that integrates a variety of process technologies to create a special glossy effect on the surface of the printed product. Due to the adoption of this printing technology, a variety of luxurious, elegant, chic, peculiar and unexpected visual effects can be produced on the surface of printed products, which greatly improves the grade and grade of commodity packaging, and is particularly popular in the field of packaging and decoration. Although some of these technologies require more sophisticated and sophisticated equipment, there are also many processes that do not require replacement and input. Some change and adjust the printing process and materials. This is a very viable New printing technology.
Pearl printing
Pearlescent printing refers to the use of special printing materials and processes to produce a glossy effect similar to that of pearls and shellfish on the surface of printed products, giving people a soft, pleasing and elegant visual experience.
1. The pearlescent effect can be achieved through the print transfer of pearlescent ink. The early pearlescent ink materials were mostly extracted from natural fish scales. Pearlescent powder sources are limited and the price is very expensive. In recent years, some research institutes at home and abroad have successively trial-produced new materials coated with titanium dioxide, natural mica or synthetic mica. Its luminosity, tinctorial strength, chemical and physical properties are close to and achieve the natural pearlescent effect, and it is an ideal pearlescent ink material, which is now widely used. Pearlescent printing requires that the printed product should have a certain pearlescent texture. Therefore, the content of the pearlescent powder in the ink is generally not less than 30%. It is also required that the pearlescent ink should have a certain thickness on the printed product so that the pearlescent effect is more obvious. Therefore, thicker screen printing, gravure printing, flexographic printing, etc. should be used; for letterpress printing, similar results can be achieved if multiple overprints are used. Pearlescent printing also uses paper that has been coated with pearlescent paint, and then printed with common inks. There are also pearlescent powders made into pearlescent powder foil materials that are stamped on printed products. After embossing, the texture and effect are more unique.
2, pearlescent effect can also be used in the printing of a silver or silver ink on the first printing, and then overprint a layer of very transparent, very thin layer of ink. Because the coarser silver particles have a certain flashiness, numerous flash bodies are combined and reflected with each other, and then appear through the transparent color ink layer to form a very delicate special luster. This is another kind of pearlescent effect. This pearlescent printing process requires that the silver layer must be handled well. The silver or silver ink with better glittering property should be used first, and other color inks can not be mixed. Then a certain amount of bright paste is added, and the color ink of the diluting agent is overprinted. On the silver layer, the effect can be achieved. Of course, the transparency of the ink layer is also the key to the pearl effect. This pearlescent printing process is more suitable for letterpress printing because of the interrelationship between silver-base processing and ink overprinting. The lithographic printing should solve the problem of how to print the silver bottom, and rationally superimpose the four-color continuous edition on it. Due to the variety of light and shade and the change of tone levels, the effect of forming a print product is very strange. Of course, relief printing can also be based on the process of cross-color printing, two or more different colors, different transparency of the ink layer once overprinted on the print, you can also make this pearl printing into a new realm.
Crystalline gloss printing
Crystal luster refers to the printed matter or transparent ink layer contains a substance such as crystal, in the fluorescent lamp or light angle of change, can produce a brilliant and colorful sparkling special effects. Crystalline gloss printing is generally achieved by two processes: one is to first form a bonding layer with a large viscosity ink on the printed product, and then transfer the printed product to a heat source for drying. The crystalline flash body substance is mostly formed by smashing particles that are colored after dyeing of the polyester layer of Dacron, or formed by crushing with a special flash fiber. The other method is to mix the crystalline flash body with a binder to contain the surface of the microparticles as an ink, which is directly transferred to the printed product by printing means. In general, the dry-spray bonding method can use coarse crystalline flash bodies, which have better flash effects. However, due to the fact that the particles are easy to float and fly, the formed work scene is dirty and the operation is troublesome, and it is not suitable for large-scale production. Ink printing methods, although the printing process is simple, hygienic, and suitable for mass production, but due to the flash crystal body is contained by the ink layer, but also to consider the ink transfer and other factors, the crystal can not choose too coarse particles, its flash effect is relatively poor some. Because these two methods must make the surface of the printing product to form a certain thickness of ink layer to achieve the effect of crystal luster, so it is particularly suitable for screen printing process production.
Fluorescent and phosphorescent printing
Phosphorescence and fluorescence have long been known. As early as the year AD 450, there was a record of the “luminous wall†and the night phoenix of folklore in China’s Later Han Dynasty. In fact, the "luminous wall" is a kind of fluorescent surface, and the night phoenix should contain phosphorous components that will glow in the dark after friction heating.
Luminescence is the process by which an object converts absorbed energy into light radiation in some way. The phenomenon in which a light body emits light due to an external action is called "excitation" in optics. The difference between fluorescence and phosphorescence is that the path from which the excited molecule drops from the excited state to the ground state is different, and the length of time from the excitation to the light emission is different. Therefore, when the incident light source is cut off, the presence of phosphorescence can also be seen, and the fluorescence will soon disappear. Luminous substances are divided into organic and inorganic two categories: inorganic phosphors are red (yttrium oxide), yellow-green (zinc sulfide), blue (silver sulfide) and so on. This kind of phosphor is expensive and is mainly used for coating color picture tubes. The inorganic phosphor particles with lower price are rougher, and after being ground, the light-emitting crystals are destroyed and the luminance decreases. The ink made with this kind of phosphor has poor transparency, strong hiding power, easy to paste and print, but it has strong moisture resistance. Synthetic organic phosphor powder contains two parts: carrier and stimulant. The stimulant can stimulate the specific carrier to emit light that does not emit light or emit light. Different types of stimuli can also change the wavelength and color of the originally emitted light. This organic phosphor powder has a simple manufacturing process, low price, fine particles, and a small loss of luminescence brightness after mechanical grinding, and is made of it. High ink transparency, low hiding power.
Phosphorescence and fluorescence printing before the use of two more production process: one is the light powder made of paint, produced into phosphorescent, fluorescent paper and then ink printing; the other is the direct printing of light powder made of ink. There are two methods for preparing the ink: one is to add the binder and solvent in the light powder and the ink is made after ball milling; the other is to directly synthesize a colorless and transparent phosphor liquid, which is naturally dried or cured by UV light after printing. dry. In particular, it should be pointed out that the phosphorescent and fluorescent inks should be on the top layer of the print, that is, the last layer of the print, to prevent the general ink color from covering the phosphor color. Because the phosphorescent color is printed on other ink colors, black, deep purple and other colors will absorb phosphorescence, so that the luminous intensity decreases; white and light colors can improve the luminous brightness. Therefore, try to use light, light tone or reduce the printing level.
Variable gloss printing
Variable gloss printing refers to the use of special inks or materials to produce prints, and the prints can produce a gloss change in printing process under a certain amount of energy. At present, it can be divided into two kinds of thermochromic and photochromic printing processes.
1. Thermochromic printing process. The process is to use some of the substances that can generate color change when exposed to heat, such as: metal iodides, complexes, double salts and liquid crystal materials, etc., and the ink is made to form a color change layer on the printed products. Prints can change color with changes in temperature and external heating conditions. Thermochromic inks can be divided into reversible thermochromism and irreversible thermochromism. The former refers to the detachment of the heat source, the color can be restored to the original state, the latter refers to the color can not be restored to its original state. According to relevant information, the key to the production of thermochromic ink materials is the use of microencapsulation technology for the preparation of colorants, discoloration materials, etc., followed by the appropriate addition of binders and fillers to make inks. The color ink thus obtained can make the color change vivid and sensitive without being affected by other reactive substances, and can improve its heat resistance, durability and wash durability.
2. Photochromic process printing. Photochromic process printing is the use of photochromic materials, using micro-capsule technology processed into ink, and then passed through the printer to print on the formation of a color change layer. Under the effect of sunlight and light, the printing product will change its color: from dark to light, or from light to dark; from colored to colorless, or from colorless to colored; leaving the light source, it will return to its original shape; Luster printing has attracted people's attention because of its special properties and functions. In recent years, it has been popularized and applied in the field of packaging and decoration, especially in terms of packaging anti-counterfeiting. As long as people take a certain heat source or light source to contact with the decoration with variable ink, verifying the change of ink can be seen as authentic. $Page break $
Metallic printing
Metallic printing should have a certain connection with the printing process. In the process of printing iron, it was found that the more transparent ink is printed on tinplates that have been plated, polished, and mirror-finished. The printed products can produce a glittering, translucent, splendid effect, and the feeling is very high. Affected by this, due to the appearance of metal cardboard and anodized aluminum materials and vacuum aluminum plating technology, it was cited in the field of paper products and plastic composite packaging. Metal cardboard is also called aluminum foil paperboard. One of its production processes is to adopt calendering method to make aluminum aluminum into ultra-thin aluminum foil and compound it with paperboard. The other is to apply plastic film after vacuum aluminum plating. Composite paper. In general, metal cardboard has a smooth surface with a mirror effect, no micropores, and poor printability. It should be printed with ink with strong adhesion. In addition, the amount of ink is also very important, the ink volume should not be conjunctiva dry, affecting the transparency of printed products, easy to bring dirty; small amount of ink, do not cover the bottom. Practice has proved that the use of UV light curing ink printing process can make the ink instantly dry, the effect is better. Anodized aluminum stamping materials are also another process of metallic gloss printing. Electro-aluminum, also called metal powder foil heat transfer material, transfers the sprayed metal layer to the print by heating and pressing, so that the printed product produces a splendid metallic luster. At present, most of the packaging has the requirements of hot aluminum, hot iron and aluminum technology can also be used after the hot embossing treatment, hot convex one-time molding, hot pressing and other advanced technology to make the print more abundant and diverse. The material made by rolling aluminum foil and plastics, or after vacuum aluminum plating and secondary compounding, can also be applied
Packaging special glossy printing type