Ink roller glazing during bump hot stamping
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Roller glazing: The varnish is transferred to the carton surface using a roll coating device. The amount of glazing, pressure, etc. of the glazing unit are controlled by the printing machine control center. The coating liquid supply mechanism of the Heidelberg printing machine glazing device can control the whole process of the glazing liquid supply, and the glazing liquid is pumped from the liquid storage tank through the hose to the glazing liquid hopper tray by the electronic double diaphragm pump. The level of the liquid level and the circulation of the coating liquid are monitored by a potentiometer to ensure uniform supply of the coating liquid, and the ultrasonic monitor can monitor the amount of glazing of the coating liquid at any time. The roller glazing unit of the KBA Rapida 105 offset press has a two-roller system that operates as a clockwise one, and a three-roller system that can be used as a reverse operation. When the two-roller is operated in a timely manner, the metering roller is disengaged, and the amount of coating of the glazing is adjusted by the pressure between the glazing cylinder roller and the liquidizing roller, and the structure is simple. When working in the three-roller reverse running mode, the polishing roller and the liquid roller are reversely operated to obtain a glazing film with good brightness: at the same time, when using high-viscosity glazing, it is not necessary to increase the pressure between the rollers too much. To achieve a thin and even coating purpose. The roller type glazing device has the characteristics of short transmission path, less contact points, difficulty in drying the glazing liquid, uniform transfer of the glazing liquid, and simple and convenient operation.
Scraper-type glazing: A closed squeegee glazing system consisting of a ceramic anilox roll and a closed squeegee and a flexible resin coated plate roll. The main advantage is that by selecting different ceramic anilox rolls, the coating can be accurately applied according to the required coating amount, and the glazing oil can be saved; the quick-change anilox roller, the glazing coating device and the whole coating, local Polishing function. Usually consisting of two scrapers and a ceramic anilox roll for metering, the upper and lower scrapers and the anilox roll form a closed box structure, and the polishing liquid is pumped through the pipeline. The scraper type glazing device has the characteristics of uniform and constant glazing, high quality, good effect, good environmental protection, economy, and easy realization of high-speed glazing. It can adapt to the gold and silver glazing on the surface of the carton, and the glazing coating can achieve a relatively high wear resistance.
. Hot stamping
In the fierce market competition, in order to increase the added value of products, more effective packaging anti-counterfeiting, more and more packaging cartons use hot stamping process. Hot stamping has ordinary hot stamping, cold stamping, bump hot stamping and holographic hot stamping. Commonly used ordinary hot stamping processes include flat stamping and hot stamping. Because the round flat stamping is a line contact, it has a wide range of hot stamping substrates, is suitable for large-area hot stamping, and has high stamping accuracy, and is widely used.
Cold stamping: Instead of using a heated metal plate, the metal foil is transferred by means of a printing adhesive. The cold stamping process has low cost, energy saving and high production efficiency, and is a new process with great development prospects.
Bumping hot stamping (also known as three-dimensional hot stamping): the use of modern engraving technology to make the upper and lower matching negative and male molds, hot stamping and embossing process at one time, improving production efficiency. The mold made by electric engraving can be curved to achieve a three-dimensional relief effect that is difficult to achieve by a general corrosion method. The appearance of bump hot stamping enables the hot stamping and embossing process to be completed at the same time, reducing the number of processes and scraps caused by inaccurate overprinting.
Holographic logo: The computer technology is used to change the amplitude and frequency of the grating, so that the effect is more vivid and clearer than the color of the calculated pattern. If such a holographic mark is used as a copy of the original, a large amount of holographic loss is generated, thereby achieving the purpose of anti-counterfeiting. According to the characteristics of the hologram hot stamping mark, it can be divided into continuous holographic mark hot stamping and independent holographic mark hot stamping. Continuous holographic marking hot stamping is a replacement for ordinary laser holographic hot stamping. The independent holographic logo stamping is to make the holographic logo on the anodized aluminum into a separate trademark pattern, and there is a registration mark next to each pattern.
The holographic logo can not only have very good anti-counterfeiting performance, but also can be used to holographically mark special numbers or words according to customer needs. The holographic logo is printed on the packaging carton, not only to emboss the holographic mark on the surface of the substrate, but also has a relatively high overprinting precision, and is widely used in high-grade carton packaging.