Special gloss printing for top grade packaging

2022-07-30
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High end packaging is printed with special gloss

in recent years, consumers have no longer regarded the picky eyes of consumers as the bright, gentle, unpredictable and pearlescent shell of some splendor packaging products, which began to increase their demand for beauty. Special gloss printing is what attracts and intoxicates the high-grade printing and packaging with gas gloss and stimulates the desire to buy goods. Special gloss printing is a comprehensive printing technology that integrates various technologies, which can produce special gloss effect on the surface of printed products. Because this printing technology can produce a variety of luxurious, elegant, unique, strange and unexpected visual effects on the surface of printed products, it has greatly improved the grade and taste of commodity packaging, especially popular in the field of packaging. Although some of these technologies need to use sophisticated and sophisticated equipment, there are also many processes that do not need to be replaced or invested in equipment, but only change and adjust the printing processes and materials, such as the international organization for Standardization (ISO), the European Committee for Standardization (CEN), the American Association for the advancement of medical instruments (AAMI) and the China National Standardization Administration (SAC). This is a kind of operation cost method with a certain amount of brightening paste and diluent removal. It attempts to establish a data base to divide the operating expenses (maintain the normal operating expenses) around the operation, non operation, product, channel, customer range, etc. by overprinting the color ink on the silver layer, the effect can be achieved. Of course, the transparency of the ink layer is also the key to the pearlescent effect. This pearlescent printing process is more suitable for relief printing because of the relationship between silver bottom treatment and ink layer overprint. Lithography should solve the problem of how to print a good silver background, and then reasonably overprint the four-color patterns on it. Due to the changes of various levels of light and shade and hue, the printing effect is unique. Of course, relief printing can also overprint more than two ink layers with different hues and transparency on the printed matter at one time according to the process method of cross color printing, which can also make this pearlescent printing step into a new realm

a certain thickness of ink layer can achieve the crystal luster effect, so it is especially suitable for the production of plate printing process

pearlescent printing refers to the use of special printing materials and processes to produce a gloss effect similar to pearls and shellfish on the surface of printed products, giving people a soft, pleasing and elegant visual impression

1. Pearlescent effect can be obtained by printing with pearlescent ink. The early pearlescent ink materials were mostly extracted from the fish scales of yaoran. The source of pearlescent powder was limited and the price was very expensive. In recent years, some scientific research departments at home and abroad have successfully developed new materials coated with natural mica or synthetic mica. Its luminosity, coloring power, chemical and physical properties are close to and reach the natural pearlescent effect. It is an ideal pearlescent ink material, which has been widely used. Pearlescent printing requires a certain pearlescent texture. Therefore, the content of pearlescent powder in the ink is generally not less than 30%. At the same time, it is also required that the pearlescent ink should have a certain thickness on the printed product to make the pearlescent effect more obvious. Therefore, plate printing, gravure printing, flexographic printing, etc. with thick imprint shall be adopted; Letterpress printing can achieve similar effect if it adopts multiple overprint. Pearlescent printing also uses paper coated with pearlescent coating, and then printed with ordinary ink; There are also pearlescent powder foil materials made of pearlescent powder, which are hot stamped on the printed products, and then embossed. Its texture and effect are more unique

2. The pearlescent effect can also be achieved by first laying a layer of silver paste or silver ink on the printed product, and then overprinting a very transparent and thin color ink layer. Because the relatively coarse silver powder particles have a certain flash, a large number of flash bodies are still used in the finished product inspection and single 1 material index test to combine and reflect each other, and then appear faintly through the transparent color ink layer, forming a very subtle special luster, which is another kind of pearlescent effect. This pearlescent printing process requires that the silver layer must be treated well. Silver paste or ink with good flash shall be used first, and other color inks shall not be mixed, and then the transparent ink layer shall be mixed with crystalline substances. Under the change of sunlight or light angle, it can produce a special effect of colorful and glittering. Crystal Gloss printing is generally achieved by two processes. One is to first put the printed matter on the ink with high privacy to form a cat knot layer, and then move the printed matter to a heat source for drying. Crystalline flash materials are mostly particles crushed after coloring with polyester sprayed metal layer, or formed after crushing with special flash fiber. The other is to mix the crystal flash with the connecting material to contain the surface of the particles into an ink, which is directly transmitted to the print by printing means. Generally speaking, the dry sprinkling method can select the crystal flash with coarser particles, and its flash effect is better. However, because the particles are easy to disperse and fly, the working surface is dirty and the operation is troublesome, so it is not suitable for large-scale production. Ink making printing method, although the printing process is simple, sanitary, and suitable for mass production. However, as the flash crystal is contained by the ink layer and ink transfer and other factors should be considered, the crystal cannot be too coarse, and its flash effect is relatively poor. It has long been known that the phosphorescence and fluorescence phenomena must be formed on the surface of the printed matter by these two methods. As early as 450 A.D., there were records about the "night light Bi" in China (later Han Dynasty}), as well as the night pearl in folklore. In fact, the "luminous wall" is a kind of fluorescent surface, and the luminous pearl should contain phosphorus. They shine in the dark when heated by friction

luminescence is a process in which an object converts absorbed energy into light radiation in some way. The phenomenon that a luminescent body emits light due to external effects is called "excitation" in optics. The difference between fluorescence and phosphorescence is that the excited molecules fall from the excited state to the ground state through different paths? The time from excitation to luminescence is also different. Therefore, when the human light source is cut off, the presence of phosphorescence can be seen, and the fluorescence will soon disappear. Luminescent substances are divided into organic and inorganic. Inorganic phosphors are red (oxide), yellow green (zinc sulfide), blue (silver sulfide), etc. This kind of phosphor is expensive and is mainly used to coat color picture tubes. The inorganic phosphor with lower price is rough, and the luminous crystal is damaged after grinding, which reduces the luminous brightness. The ink made of this phosphor has poor transparency, strong hiding power, and is easy to paste, but it has strong moisture resistance. The synthetic organic phosphor powder consists of two parts: carrier and excimer. The excimer can excite a specific carrier to make a material that does not emit light or emits weak light. Different types of excimer can also change the wavelength and color of the original light. This organic phosphor powder has simple manufacturing process, low price, fine particles and small loss of luminous brightness after mechanical grinding. The ink made of it has high transparency and low hiding power

phosphorescence and fluorescent printing are currently produced by two processes. One is to make phosphor powder into coating, produce phosphorescence and fluorescent paper, and then ink printing. The other is to make light powder into ink for direct printing. There are two methods to prepare ink: one is to add connecting material and solvent to the light powder, and then make the ink after ball milling. The other is directly synthesized into colorless and transparent phosphorescent liquid, which is naturally dried after printing or cured and dried by UV light. It should be noted that phosphorescent and fluorescent inks should be placed on the top layer of the print, that is, the last layer of the print, to prevent the phosphorescent color from being covered by the general ink color. The phosphorescent color is printed on other inks, while black, dark purple and other colors will absorb phosphorescent light, reducing the luminous intensity; White and light colors can improve the luminous brightness. Therefore, try to use light and light tone or reduce the printing level. Microcapsule technology is used to make ink, which is then printed on the printed matter to form a color change layer. Under the action of sunlight and light, the color of printed matter will change: from deep to shallow, or from shallow to deep; Or from colored to colorless, or from colorless to colored. When you leave the light source, it will return to its original state. Variable gloss printing has attracted people's attention because of its special performance and the function of blending pointer. In recent years, it has been popularized and applied in the field of packaging, especially in the field of packaging anti-counterfeiting. As long as people take a certain heat source or light source to contact with the decoration printed with variable ink to verify the change of ink, we can immediately see the authenticity. Before, most of the packages have the requirement of hot anodized aluminum. Ironing and anodizing process can also adopt advanced technologies such as post ironing embossing treatment, one-time embossing forming, large-area ironing and pressing to make prints more colorful. Materials made by calendering aluminum foil and plastic composite or vacuum aluminum plating and secondary composite can also be used in flexible packaging. It not only increases the metallic luster of the flexible packaging and improves the packaging grade, but also has strong sun resistance and ultraviolet radiation resistance

variable gloss printing refers to a printing process in which special inks or materials are used to produce printing products, and the printing products can produce gloss changes under the variable force of certain energy. At present, it can be divided into two printing processes: thermochromic and photochromic

1. Thermochromic printing process. This process uses some substances that can produce color change when heated, such as metal iodide, complex, double salt and liquid crystal materials, to make ink to form a color change layer on the print. Printing products can change color with temperature changes and external heating conditions. Thermochromic ink can be divided into reversible thermochromic and irreversible thermochromic. The former means that the color can be restored to its original state after being separated from the heat source. The latter means that the color cannot be restored. According to relevant information, the key to the production of thermochromic ink materials is to use microencapsulation technology to treat the colorants and color changing substances, and then add appropriate connecting materials and fillers to make ink. The color changing ink prepared in this way can make the color change bright and sensitive, not affected by other reactive substances, and can improve its heat resistance, durability and washability

2. Photochromic process printing. Photochromic printing is a kind of metal luster printing with photosensitive color changing materials, which should be related to iron printing process. In the iron printing process, it is found that printing with transparent ink on the coated, polished and mirror treated tinplate can produce a shiny, transparent and magnificent effect, which makes people feel very high-grade. Affected by this, due to the emergence of vacuum aluminum plating technology, metal paperboard and electrochemical aluminum materials are gradually introduced into the field of paper and plastic composite packaging. Metal paperboard is also called aluminum foil paperboard. One of its production processes is to use calendering method to make metal aluminum into ultra-thin aluminum foil and then composite it with paperboard; The other is the combination of plastic film and paper after vacuum aluminizing. Generally speaking, the surface of metal paperboard is smooth, with mirror effect, no micropores, and poor printability. Therefore, ink with strong adhesion should be used for printing. Moreover, the ink amount is also very important. A large amount of ink is not easy to dry the conjunctiva. At the same time, it affects the transparency of printed products and is easy to get dirty. Small amount of ink, no cover. Practice has proved that the printing process using UV curing ink can make the ink dry instantly, and the effect is better. Anodized hot stamping material is also another process of metal gloss printing. Electrochemical aluminum, also known as metal powder foil heat transfer material, passes the sprayed metal layer

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