Colorful bronzing technology enhances value for print

People require print packaging to be more upscale, exquisite, environmentally friendly and personalized to meet this demand. It is the finishing of the printed matter, which improves the grade of the printed product through the decoration and decoration. The post-press processing of printed materials is used as a supplement to the printing technology, combined with printing, and is combined with appropriate colors, characters, and patterns to form a balanced picture: it can produce dynamic and rhythmic feelings and form a strong visual effect. Post-press processing not only improves the added value of printed products, satisfies the requirements of different printing customers, but also is an important link to ensure the quality of printed products.

In the post-printing process of printed materials, the surface finishing effect of printed materials is loved by people. The processing of surface finishing of printed products mainly includes polishing or laminating for improving the glossiness of printed materials; in order to improve the three-dimensional impression of printed materials, With indentation, embossing or crystal three-dimensional plastic drop processing; enhanced print flicker refraction, bronzing processing and so on. The combination of hot stamping and embossing process not only has the characteristics of gloss, three-dimensional, flicker and other characteristics, there is a higher security performance. Make the print colorful, resplendent, even more luxurious, sophisticated and difficult.

The bronzing is the use of a stencil mounted on a stamping machine with a certain pressure and temperature. The printed matter and the hot stamping foil are pressed together in a short time, and the metal foil or the pigment foil is transferred according to the graphic image of the hot stamping stencil to the processing technology of the surface of the hot printed matter. 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, building decoration, arts and cultural supplies and so on. It is also widely used in high-end packaging such as greeting cards, invitations, banknotes, cigarette labels, medicines and cosmetics.

Gold foil foil not only has a good decorative effect, but also has a strong anti-counterfeiting capabilities, can prevent the use of copying machines and scanners fraud, has become the world's governments in large-value banknotes, identity cards and passports, an important material for security. The color of gold foil can be varied when viewed. In the Netherlands, the value of 10 foil is used. The color of foil used changes from silver to blue and then to black. The holographic foil is used for security on euros.

Diverse hot stamping techniques

In the hot stamping process can be divided into the first hot after printing and printing after the first two kinds of hot, most hot stamping is the first hot after printing. Such as ordinary gold, laser gold hot stamping and holographic hot stamping, commonly used in the hot stamping of gold, silver, laser and glass cards, has been widely used in Western countries.

Holographic positioning bronzing adopts corresponding anti-counterfeiting patterns, special techniques, safety and anti-counterfeiting functions, and has reached consensus in the world. Using holographic positioning probes, precise control of galvanized aluminum and high bronzing quality. Since holographic aluminum manufacture is relatively difficult in the country, there are few manufacturers: the process is complex, so it is difficult to imitate, and the cost is high. It is often favored in high-grade cigarette cases, large-value cheques, retail gift certificates, identity cards and coins. If used on the front page of a passport, security is achieved through the use of a complex pattern that is officially identified as a distinguishing mark.

Most bronzing is directly bronzing on printed materials, there are also bronzing on the surface of UV varnish and bronzing on adhesive film materials. The process of bronzing on the surface of UV varnish has a very high requirement for the UV varnish and bronzing of the galvanized aluminum. When bronzing, it is necessary to ensure that the two are closely attached and have good bronzing applicability. In the self-adhesive film material, the bronzing is further 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 gold foil from falling off and the bronzing is not true, so the surface of the film needs to be pretreated. To ensure the quality of gilding.

The first hot stamping is the new idea of ​​the printing industry and the smoke label design. The first hot stamping is the first hot stamping of silver foil on the white card paper, and the printing of the graphic on the surface of the hot stamping silver foil is a large-area hot stamping technology. This processing method usually uses a round or flat round hot stamping machine. When the hot stamping, the pressure is the line contact mode. When the hot stamping is done in a large area, the phenomenon of air bubbles will not appear like the flat stamping hot stamping. The hot stamping surface is very smooth. Full-size stamping does not increase the load on the machine.

New bronzing technology

1. Three-dimensional hot stamping technology

Three-dimensional hot stamping is the use of corrosion or engraving technology to create gold foil and concave and convex graphics into a match up and down the female and male models, to achieve the gold foil and embossing once completed the process. This process also completes the hot embossing of the gold, reducing the processing waste and waste products that are not allowed to be printed. Improve production efficiency and product quality.

Stereoscopic hot stamping often adopts high-pressure hot stamping embossing materials, which can display different colors when viewed at different angles, achieving ideal anti-copying and anti-counterfeiting functions. Covering the subtle level of the graphic and text, avoiding the tampering and forgery of tickets, documents, etc. Pearl pigments can also be used in transparent foil materials, which will present different colors when viewed from different angles.

Three-dimensional hot stamping can be flat, flat and circular round hot stamping die cutting machine. Bronzing uses corroded copper plates or carved brass plates. The corroded copper plate is used for flat hot stamping and has a short service life, typically 100,000 times. The carved brass plate has a service life of up to 1 million cycles. It is suitable for long-lived, hot stamping with good quality. The concave and convex molds are prefabricated with gypsum or glass fiber materials. The gypsum material has low cost, but the processing is more complicated; the glass fiber material is easy to install and locate.

2. Cold gilding technology

Cold bronzing technology is a brand new bronzing process that does not require the use of heated metal plates. Instead, the adhesive is applied directly to the graphic that needs decoration. When the print is transferred, the galvanized aluminum is in contact with the adhesive to make the electrification. Aluminum adheres to the print surface. Cold stamping usually uses round press processing. The hot stamping speed is faster, but the hot stamping surface has poorer effect and firmness. Therefore, the prints also need to be coated or coated. The cold bronzing process is a promising technology because of its low cost, energy saving, and high production efficiency.

Reproduced from: China and Hong Kong silk screen network