Colorful bronzing technology enhances value for prints
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People demand that the packaging of printed materials be more upscale, exquisite, environmentally friendly and personalized, the main way to meet this demand. It is the finishing of printed matter, and the improvement of the grade of printed products through finishing and decoration. The post-press processing of printed matter is supplemented by printing technology. Combined with printing, it combines with appropriate colors, characters, patterns and the like to form a balanced picture: it can produce dynamic and rhythmic feeling and form a strong visual effect. Post-press processing not only increases the added value of printed products, meets the requirements of different printing customers, but also ensures an important part of the quality of printed products.
In the post-press processing of printed matter, the surface finishing effect of printed matter is favored by people. The finishing of printed surface finish mainly includes glazing or laminating processing to improve the gloss of printed matter; die-cutting to improve the three-dimensional sense of printed matter With indentation, embossing or crystal three-dimensional plastic drop processing; refraction, bronzing processing and so on to enhance the flickering of printed matter. The combination of bronzing processing and embossing not only has the characteristics of glossiness, three-dimensionality and flickering, but also has high anti-counterfeiting performance. Make the prints bright and colorful, and show their luxury, exquisiteness and high difficulty.
Hot stamping is the use of a stencil mounted on a hot stamping machine with a certain pressure and temperature. The printing process and the hot stamping foil are pressed in a short time, and the metal foil or the pigment foil is transferred to the surface of the hot printed matter by the graphic of the hot stamping stencil. The bronzing process is widely used in high-grade, exquisite packaging and decoration, trademarks and book covers, as well as household appliances, architectural decoration, craft and stationery. It is also widely used in high-end packaging such as greeting cards, invitations, banknotes, cigarette labels, medicines, and cosmetics.
The bronzing foil not only has a good decorative effect, but also has a strong anti-counterfeiting function. It can prevent fraudulent use of copiers and scanners, and has become an important material for governments in the world in the protection of large amounts of banknotes, ID cards and passports. The color of the foil can be changed in view. The Dutch foil value is 10 guilders. The color of the foil is changed from silver to blue and then to black. The holographic foil is used for anti-counterfeiting on the euro.
Diverse bronzing technology
In the hot stamping process, it can be divided into two types: hot stamping and preprinting and hot stamping. Most hot stamping is hot stamping. Such as ordinary gold, laser gold stamping and holographic hot stamping, commonly used in hot stamping on gold, silver, laser and glass cards, has been widely used in Western countries.
The holographic positioning bronzing adopts the corresponding anti-counterfeiting pattern, special process, safety and anti-counterfeiting functions, and has a consensus in the world. The holographic positioning probe is used for precise control of the anodized aluminum and high quality of bronzing. Because holographic galvanic aluminum manufacturing is relatively difficult, the manufacturers are few: the process is complicated, so it is difficult to imitate, the cost is high, and it is usually favored in the anti-counterfeiting of high-grade cigarette cases, large-value check, retail gift vouchers, ID cards and coins. If used on the front page of the passport, the anti-counterfeiting is carried out by using the officially determined complex pattern as the identification mark.
Most bronzing is directly bronzing on printed matter, as well as bronzing on the surface of UV varnish and bronzing on self-adhesive film materials. The process of bronzing on the surface of UV varnish has a very high requirement for UV varnish and bronzing of galvanized aluminum. When bronzing, it is necessary to ensure that the two are closely attached and have good bronzing suitability. The bronzing on the self-adhesive film material is divided into direct bronzing on the film and bronzing on the surface of the ink layer. This process is to prevent the ink layer or the gold foil from falling off and the bronzing is not true, so the surface of the film should be pretreated. To ensure the quality of bronzing.
The first hot stamping is a new idea in the printing industry and cigarette label design. First hot stamping is to first print the silver foil on the white cardboard, and then print the graphic on the surface of the hot stamping silver foil, which is a large-area hot stamping technology. This kind of processing method usually adopts round flattening or round pressing and bronzing machine. When hot stamping, the pressure is line contact. In the case of large-area hot stamping, bubbles will not appear like flat stamping, and the hot stamping surface is very flat. The full version of hot stamping does not increase the load on the machine.
New bronzing technology
1. Stereo stamping technology
The three-dimensional bronzing is to use the etching or engraving technology to make the image of the bronzing and the concave and convex into a female die and a male die which are matched up and down, and realize the process of bronzing and embossing at one time. This process simultaneously completes the hot stamping of the gold mouth, reducing the waste of the processing process and overprinting. Increased production efficiency and product quality.
Stereo stamping often uses a high-resolution gilt embossing material, which can display different colors at different angles, achieving ideal anti-copy and anti-counterfeiting functions. The subtle levels of the text are covered to avoid tampering and forgery of tickets and documents. It is also possible to use pearl pigments in transparent foil materials that will look different when viewed from different angles.
The three-dimensional bronzing can be flat flattened, round flattened and round pressed hot stamping die-cutting machine. Hot stamping uses a corroded copper plate or engraved brass version. Corrosion copper plate is used for flat bronzing, and its service life is short, generally 100,000 times. The engraved brass plate has a service life of up to 1 million times. It is suitable for long-running and good quality of bronzing. The concave and convex bottom mold is pre-formed with gypsum or glass fiber material, and the gypsum material has low cost, but the processing is complicated; the glass fiber material is conveniently installed and positioned.
2. Cold stamping technology
Cold bronzing technology is a brand new bronzing process. Instead of using a heated metal plate, the adhesive is directly applied to the graphic to be decorated. When the transfer is transferred, the electrochemical aluminum contacts the adhesive to electrify. Aluminum is attached to the surface of the print. Cold bronzing is usually carried out by round pressing, and the bronzing speed is faster, but the bronzing surface effect and firmness are poor. Therefore, the printed matter also needs to be glazed or coated. The cold stamping process is a promising technology with low cost, energy saving and high production efficiency.