Three-dimensional hot stamping is widely used in post-press processing of tobacco and alcohol packaging. It has good hot stamping quality and high precision. The edges of the hot stamping images are clear and sharp, the surface gloss is high, and the pattern is bright and smooth. The three-dimensional hot stamping adopts the electric carving method to make the three-dimensional hot stamping plate. Although the cost of electro-engraving hot stamping is much higher than the corrosion method, it is still very suitable for long-term work such as tobacco and alcohol, reducing the process and reducing the rate of waste. This article mainly introduces the technical key and superiority of the three-dimensional hot stamping process of electric engraving, and briefly introduces the development direction of the three-dimensional hot stamping technology.
1. The principle of three-dimensional hot stamping
Three-dimensional hot stamping, that is, hot stamping and embossing are completed at one time: using a hot stamping plate and a bottom mold, under a certain pressure and temperature, the printed substrate will undergo plastic deformation, and at the same time, the electrochemical aluminum foil will be printed on the printed product or other substrate Deformed parts, thereby artistically processing the surface of the printed matter. The three-dimensional electro-engraving hot stamping plate has high precision and the stamping effect is very beautiful. The electro-engraved brass plate is generally used in post-press processing. It is controlled by computer software to perform three-dimensional engraving on the scanned image in advance. The bronzing plate produced in this way can be used for three-dimensional bronzing with the pre-made relief plate. The key of this process is plate making. The graphic part of the hot stamping plate should be rounded lines, which is different from the right-angled lines of the ordinary flat hot stamping plate. .
2. Characteristics of electro-engraving plate making
Plate material: 7mm thick brass plate, the service life can reach more than 1 million prints, which can greatly reduce the downtime of the plate change, and the brass is harder than the copper used in ordinary corroded flat bronzing plates, and the performance of small patterns is more Ideal. The traditional corroded copper plate is 2mm thick, and it is riveted to another thick copper plate or aluminum plate for low cost, but it can only be used for flat bronzing and the service life is generally only 100,000 printed.
Plate making: Using computer numerical control engraving plate making (CNC), it can meet the high requirements of hot stamping on the level and detail than the traditional etching process; the raised edges can adopt different shapes to obtain precise and perfect corners to ensure the printed products. Hot stamping and embossing patterns can obtain the expected edge definition; the ability to scale the pattern is unmatched; the hot stamping plate and the bottom mold are easy to copy, and the appearance of the same batch of products can be consistent; The printed pictures and texts have obvious three-dimensional layers, which form a relief effect on the surface of the printed matter and produce a strong visual impact effect, which makes the packaging have a unique touch; the copper three-dimensional hot stamping plate is durable, accurate in size and basic pattern, and can be Greatly shorten the start-up preparation time, high production efficiency, good repeat production accuracy.
Bottom mold: When the embossing hot stamping reaches a certain depth, a bottom mold is required to cooperate with it. During hot stamping, the three-dimensional hot stamping plate will expand during the temperature increase, but the temperature of the bottom mold is still at room temperature, causing The hot stamping plate is not matched with the bottom mold, so special bottom mold technology is needed.
Installation: Using the easy-to-position positioning system developed by Kurz, with the marking holes and position indicator, installing copper plates and bottom molds is effortless, and the installation time is greatly shortened.
3. The key factors affecting the quality of hot stamping
Equipment accuracy: The three-dimensional hot stamping process requires two templates, concave and convex, and a hot stamping machine with high precision must be selected, otherwise the punch will be damaged. The round press hot stamping equipment has high accuracy, but the operation is difficult. Special attention should be paid to the thickness of the roller lining and the height of the lower plate table to ensure that the line speed of the equipment is consistent, otherwise it will cause slippage. The precision of the flat pressing and hot stamping equipment is not high, the position of the plate will change after the second edition, and it is also easy to cause damage to the punch. Youheng company's MK series A type round flat stamping machine adopts a patented lifting table device, which effectively solves the above problems.
The quality of anodized aluminum foil: the speed and quality of foil stamping are mainly affected by the release coating and the glue layer. These coatings are highly sensitive to heat to increase the foil stamping speed. Therefore, the anodized aluminum produced by the advanced glue formula can meet high-speed foil stamping Requirements, thereby reducing the cost of hot stamping.
4. The development trend of three-dimensional hot stamping
Nowadays, product packaging is more and more bright and dazzling. Hot stamping is a commonly used process in post-press processing. Although the quality of cold stamping is not bad, the cost is lower, but it is inferior to hot stamping. Good hot stamping quality and hot stamping effect, especially high-end commodity packaging, will use hot stamping process. The three-dimensional hot stamping is an outstanding advantage of the hot stamping process. It develops with the development of the hot stamping technology. One of the future development trends is online three-dimensional hot stamping. The improvement of the chemical properties of the three-dimensional hot stamping foil provides a reliable guarantee for the rapid increase of the hot stamping speed. Therefore, the current three-dimensional hot stamping process can already be completed online, and the application of the online hot stamping process will become more and more common in the future. In addition, the single-sheet folding carton printing is developing in the direction of web printing, which also creates conditions for the online three-dimensional hot stamping process.
Another development trend is hot stamping before printing, that is, overprinting on the hot stamping foil after hot stamping. The hot stamping first printing process also benefits from the improvement and improvement of the chemical properties of the hot stamping foil, so that UV ink can be used to print on the hot stamping foil. The hot-first printing process can provide more excellent decorative effects and improve the visual appeal of the image. Overprinting opaque or transparent color inks after hot stamping can achieve a fascinating effect, provide endless design solutions for package designers, and provide designers with a broad space to fully display their creative talents.
In addition, cost reduction and hot stamping speed increase is another development direction of three-dimensional hot stamping. The price of the rotary three-dimensional hot stamping cylinder is relatively high, which is a factor in the high cost of the three-dimensional hot stamping process. In the past five or six years, the price of the three-dimensional hot stamping cylinder has dropped by as much as 50%. In the past, due to the limitation of the speed of three-dimensional hot stamping, most of the three-dimensional hot stamping work was done offline. At present, no matter whether it is a flat flat hot stamping machine or a round flat hot stamping machine, the speed can reach 7500 ~ 12000 sheets / hour. Of course, the speed of hot stamping has a certain relationship with the type of machine used. The continuous increase in production speed has greatly reduced the cost of three-dimensional hot stamping.
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