Three-dimensional hot stamping technology and its development direction
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
Three-dimensional hot stamping is widely used in post-press processing of tobacco and alcohol packaging. The quality of hot stamping is good and the precision is high. The edges of hot stamping images are clear and sharp, the surface gloss is high, and the pattern is bright and smooth. Three-dimensional hot stamping uses the electric carving method to make a three-dimensional hot stamping plate. Although the cost of electro-engraving is much higher than that of the corrosive method, it is still suitable for long-term activities such as tobacco and alcohol, which reduces the number of processes and reduces the scrap rate. This paper mainly introduces the technical key and superiority of the electro-engraving three-dimensional hot stamping process, and briefly introduces the development direction of the three-dimensional hot stamping technology.
1. Three-dimensional hot stamping principle
Three-dimensional hot stamping is hot stamping and embossing is completed once: using bronzing plate and bottom die, under certain pressure and temperature, the printed substrate is plastically deformed, and at the same time, the electro-aluminum foil is printed on the printed matter or other substrates. The deformed part, thus the artistic processing of the printed surface. The electric engraving three-dimensional hot stamping plate has high precision and the hot stamping effect is very beautiful. The electro-engraved brass version is commonly used in post-press processing. It is controlled by computer software to perform three-dimensional engraving on the image scanned in advance. The bronzing plate thus produced is combined with the prefabricated letterpress to perform stereo bronzing. The key of the process lies in plate making. The graphic part of the hot stamping plate should be rounded lines, which is different from the right angle line of the ordinary flat hot stamping plate. Therefore, the three-dimensional hot stamping plate needs secondary processing after corrosion, which is technically difficult. .
2. Electric engraving plate features
Plate: 7mm thick brass plate, the service life can reach more than 1 million impressions, which can greatly reduce the time for stoppage change, and the brass is harder than the copper used in the ordinary corrosion plane bronzing plate, and the performance of the small pattern is more Ideal. The traditional corroded copper plate, 2mm thick, is riveted to another thick copper plate or aluminum plate for low cost, but can only be used for flat bronzing, and its service life is generally only 100,000 impressions.
Plate making: CNC engraving and engraving (CNC) is more suitable than the traditional etching process to meet the high requirements of hot stamping in layers and details; the convex edges can adopt different shapes to obtain precise and perfect corners to ensure the printed matter. Hot stamping and embossing pattern can achieve the desired edge definition; the ability to scale the pattern is unmatched; the hot stamping plate and the bottom mold are easy to copy, so that the appearance of the hot stamping and embossing pattern of the same batch of products is consistent; The printed graphic has an obvious three-dimensional layer, forming a relief effect on the surface of the printed matter, and produces a strong visual impact effect, so that the package has a unique touch; the copper three-dimensional hot stamping plate is durable, the size and the basic pattern are accurate, The startup preparation time is greatly shortened, the production efficiency is high, and the repeat production accuracy is good.
Bottom mode: When the embossing hot stamping reaches a certain depth, it needs to have a bottom mold to match with it. When hot stamping, the three-dimensional hot stamping plate will expand during the temperature rise, while the temperature of the bottom mold is still at room temperature, resulting in The hot stamping plate does not match the bottom mold, so special bottom mold technology is required.
Installation: Using the easy-to-fit positioning system developed by KURZ, with the marking hole and position display, the installation of the copper plate and the bottom mold is effortless and the loading time is greatly shortened.
3. The key factors affecting the quality of hot stamping
Equipment Accuracy: The three-dimensional hot stamping process requires two concave and convex stencils. It is necessary to use a high-precision hot stamping machine, otherwise the punch will be damaged. The round flat stamping printing equipment has high precision, but the operation difficulty is high. It is necessary to pay special attention to the thickness of the drum liner and the height of the lower plate to ensure that the line speed of the equipment is consistent, otherwise it will cause slippage. The flat stamping and stamping equipment is not high in precision, and the position will change after the second edition, and it is easy to cause damage to the punch. The company's MK series A-type round flat stamping machine uses a patented lifting platform device to effectively solve the above problems.
The quality of the electro-aluminized foil: the speed and quality of the bronzing are mainly affected by the release coating and the coating layer. These coatings are sensitive to heat and can increase the bronzing speed. Therefore, the electro-aluminized aluminum produced by the advanced glue formula can satisfy the high-speed bronzing. The requirements to reduce the cost of hot stamping.
4. The development trend of three-dimensional hot stamping
Nowadays, the packaging of goods is more and more bright and more dazzling. Hot stamping is a commonly used process in post-press processing. The quality of cold stamping is good, the cost is lower, but it is inferior to hot stamping. Good hot stamping quality and hot stamping effect, especially for high-end merchandise packaging, it is necessary to use hot stamping process. Stereo hot stamping is a prominent advantage of the hot stamping process, which has evolved with the development of 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 sharp increase of the hot stamping speed. Therefore, the stereo hot stamping process has been completed online, and the application of the inline hot stamping process will become more and more common in the future. In addition, sheetfed folding carton printing is moving in the direction of web printing, which also creates conditions for the in-line three-dimensional stamping process.
Another development trend is to apply hot stamping, that is, hot stamping and then overprinting on the hot stamping foil. The hot stamping process also benefits from the improvement and improvement of the chemical properties of the hot stamping foil, so that UV ink can be used for printing on hot stamping foil. The hot stamping process provides a more decorative effect and enhances the visual appeal of the image. Overprinting and opaque or transparent color inks can achieve fascinating effects, provide packaging designers with endless design solutions, and provide designers with ample space to fully express their creative talents.
In addition, the cost reduction and the hot stamping speed are another development direction of the three-dimensional hot stamping. The high price of the rotary three-dimensional hot stamping cylinder is a high cost factor for the three-dimensional hot stamping process, and 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 three-dimensional hot stamping speed, most of the three-dimensional hot stamping work was completed offline, and at present, the speed can reach 7500 to 12,000 sheets/hour regardless of whether it is a flat-pressing hot stamping machine or a round-pressing hot stamping machine. 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.