People demand that the packaging of printed materials be more high-end, exquisite, environmentally friendly and full of personalization, the main way to meet this demand. It is to finish the printed matter and improve the quality of the printed product through decoration and decoration. The post-press processing of the printed matter is complementary to the printing technology. It is combined with printing and combined with appropriate colors, characters, patterns, etc. to form a balanced picture: it can produce a sense of movement and rhythm and form a strong visual effect. Post-press processing not only improves the added value of printed products and meets the requirements of different printing customers, but also an important link to ensure the quality of printed products.
In the post-press processing of printed matter, the surface finishing effect of the printed matter is loved by people. The processing of the surface finishing of the printed matter mainly includes glazing or laminating processing to improve the glossiness of the printed matter; die cutting to improve the three-dimensional impression of the printed matter And indentation, concave and convex embossing or crystal three-dimensional drop plastic processing; refraction, bronzing processing to enhance the flicker of printed products, etc. The combination of bronzing processing and embossing not only has the characteristics of gloss, three-dimensionality, and flicker, but also has high anti-counterfeiting performance. The printed products are bright in color and brilliant in gold, which is more luxurious, delicate and difficult.
Bronzing is the use of a certain pressure and temperature, using the template installed on the hot stamping machine. The process of making the printed matter and hot stamping foil pressed together in a short time, and transferring the metal foil or pigment foil to the surface of the hot printed article according to the graphic of the hot stamping template. The bronzing process is widely used in high-end, exquisite packaging and decoration, trademarks and book covers and other printed matter, as well as household appliances, architectural decoration, crafts and cultural supplies. It is also widely used in high-end packaging such as greeting cards, invitations, banknotes, cigarette labels, medicines, cosmetics and so on.
Gold foil not only has a good decorative effect, but also has a strong anti-counterfeiting function, which can prevent the use of copiers and scanners for counterfeiting. It has become an important material for governments around the world in the anti-counterfeiting of large banknotes, ID cards and passports. The color of the bronzing foil can be changed in a variety of ways when viewed. In the Dutch denomination of 10 guilders, the color of the bronzing foil changes from silver-white to blue, and then to black; holographic bronzing foil is used on the euro for anti-counterfeiting.
Various hot stamping techniques
In the process of hot stamping, it can be divided into two forms: hot stamping before printing and hot stamping before printing. Most hot stamping is hot stamping before printing. Such as ordinary gold, laser gold hot stamping and holographic hot stamping, commonly used in hot stamping on gold cards, silver cards, laser cards and glass cards, has been widely used in Western countries.
The holographic positioning bronzing adopts the corresponding anti-counterfeiting patterns, the process is special, and it has security and anti-counterfeiting functions. It is agreed worldwide. Using holographic positioning probes, precise control of anodized aluminum, high quality bronzing. Because holographic anodized aluminum is relatively difficult to manufacture, there are few manufacturers: the process is complex, so it is difficult to imitate, and the cost is high. It is usually favored in the anti-counterfeiting of high-end cigarette cases, large checks, retail gift certificates, ID cards and coins. For example, if it is used on the front page of a passport, anti-counterfeiting is carried out by using the complex patterns with official identification as identification marks.
Most bronzing is direct bronzing on printed products, and there are also 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 very high requirements on UV varnish and bronzing anodized aluminum. When bronzing, it is necessary to ensure that the two are tightly attached and have good bronzing suitability. Hot stamping on the self-adhesive film material is divided into direct hot stamping on the film and hot stamping on the surface of the ink layer. This process needs to prevent the ink layer or the gold foil from falling off and the hot stamping is not true, so the film surface must be pretreated. To ensure the quality of bronzing.
Printing first and then printing is a new idea in the printing industry and cigarette label design. Hot stamping first is to stamp silver foil on white cardboard first, and then to print graphics on the surface of the silver foil stamping, which is a large area hot stamping technology. This processing method usually uses a round flattening or round flattening hot stamping machine. The pressure is linear contact during hot stamping. In large area hot stamping, unlike the flat pressing hot stamping, bubbles will appear, and the hot stamping surface is very smooth. , Full version hot stamping will not increase the load on the machine.
Brand new hot stamping technology
1. Three-dimensional bronzing technology
Three-dimensional bronzing is a process of making bronzing and concave-convex graphics into a female mold and a male mold that match up and down using corrosion or engraving technology to achieve the process of bronzing and pressing concave and convex at once. This process simultaneously completes the embossing of the bronzing mouth, which reduces the processing procedures and the waste products caused by overprinting. Improve production efficiency and product quality.
Three-dimensional bronzing often uses bronzing and embossing materials with high resolution. Viewing pictures and text at different angles can show different colors, achieving ideal anti-copying and anti-counterfeiting functions. Covering the subtle layers of pictures and texts to avoid the falsification and forgery of tickets and documents. Pearl pigments can also be used in transparent foil materials, which will show different colors when viewed from different angles.
Three-dimensional bronzing can use flat flattening, round flattening and round flat round bronzing die cutting machine. Bronzing uses corroded copper plate or engraved brass plate. The corroded copper plate is used for flat bronzing, and the service life is short, generally 100,000 times; the service life of the engraved brass plate can be up to 1 million times, which is suitable for long-run work and good bronzing quality. The concave-convex bottom mold is preformed using gypsum or fiberglass material. The cost of gypsum material is low, but the processing is more complicated; the fiberglass material is easy to install and position.
2. Cold bronzing technology
Cold bronzing technology is a brand-new bronzing process. It does not require the use of heated metal plates, but applies the adhesive directly to the graphics that need to be decorated. During the printing transfer, the anodized aluminum contacts the adhesive to make the electrification Aluminum is attached to the surface of the printed matter. Cold bronzing is usually processed by round pressing. The bronzing speed is faster, but the surface effect and firmness of bronzing are poor. Therefore, the printed matter also needs glazing or film processing. The cold bronzing process has low cost, energy saving and high production efficiency, and is a promising technology.
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