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 stamping and holographic stamping. Commonly used in hot stamping on gold, silver, laser and glass cards, it has been widely adopted in Western countries. Holographic positioning bronzing adopts corresponding anti-counterfeiting patterns, with security and anti-counterfeiting functions, and has been agreed worldwide. The holographic positioning probe is used to precisely control the anodized aluminum. Bronzing quality is high. Because holographic anodized aluminum is difficult to manufacture, there are few industrial producers and complex processes, so it is difficult to imitate and the cost is high. Usually it is also 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 official complex patterns on it as identification marks. Most bronzing is also 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. Bronzing on adhesive materials is divided into direct bronzing on the film and bronzing on the surface of the ink layer. This process needs to prevent the ink layer or the gold foil from falling off and the bronzing is not implemented, so the film surface must be pretreated to ensure Bronzing quality. Hot stamping first is a new idea in the printing industry and the design of cigarette labels. Hot stamping first is to stamp silver foil on white cardboard and then print graphics on the surface of the silver foil stamping. It is a large area of ​​hot stamping.å° æŠ€æœ¯ã€‚ Printing technology. This processing method usually uses a round flattening or round flattening hot stamping machine. The pressure is line contact during hot stamping. Unlike large flat hot stamping, air bubbles will not appear during hot stamping. The hot stamping surface is very smooth. At the same time, full-plate hot stamping will not increase the load on the machine. The principle of anodized aluminum bronzing process Anodized aluminum hot stamping is a very important post-press processing technology in packaging printing, mainly hot stamping patterns. Text. Lines to highlight the product name and trademark. Ang brand, beautify products, thereby improving the quality of packaging products. Anodized aluminum hot stamping is also often used for post-press processing of hardcover book covers, greeting cards, calendars and other products. The stamping process of anodized aluminum is as follows: the anodized aluminum is heated by a hot stamping plate, the peeling layer is melted, and then the adhesive layer is also melted. During the imprinting, the adhesive layer is bonded to the substrate, the colored layer is separated from the polyester film base layer, and the aluminum is plated. The layer and the colored layer remain on the substrate. Hot stamping anodized aluminum on the package can not only beautify the product and improve the product grade, but also play a certain role in anti-counterfeiting. Hot stamping after printing One of the purposes of adding the hot stamping process is to improve the product grade, but in practical applications, only reasonable use can play a multiplier effect. On the contrary, not only can it not reflect the advantages of the product, but also cause waste. Reasonable use of anodized aluminum hot stamping process should pay attention to the following points. 1. Things to consider in product design â‘ Fully consider the location of hot stamping, that is, the matching of the color of the hot stamped text or pattern with the printing color and the impact of post-hot stamping processing on hot stamping. â‘¡Consider the overall effect of hot stamping and the cost of hot stamping. For example, some products often only stamp the outline and text of the pattern and do not directly stamp the pattern to achieve the effect of dotted surface; for the printing design of some aluminized paper cigarette packs, the transparent yellow can be printed first and then the concave and convex Replace hot stamping, thereby reducing costs. â‘¢For hot stamping on a large area, it should also take into account the hot stamping position and the printing pattern's receiving paper, which depends on the accuracy of the product overprint, generally set to 0.2-0. 5mm. Of course, we must also consider the suitability of anodized aluminum itself. [next] 2. The effect of printing before ironing and processing after ironing General hot stamping products must be printed before hot stamping, there are single-color printing and multi-color printing; after hot stamping, it needs to be processed such as embossing, UV glazing, laminating, reprinting, die cutting, and paste box. Points to note before printing: dark and thin printing, use ink with strong coloring power, add anti-sticking agent and removing agent as little as possible in the ink, try not to spray powder, printing ink, varnish and anodized aluminum The printing suitability of hot stamping should be matched, and the influence of crystallization of ink on hot stamping should also be prevented. In the post-scaling process, the unevenness and die cutting are pressed. The effect of paste boxes on hot stamping is not great, just pay attention to prevent scratches on hot stamping foil. If you want to apply uV varnish after hot stamping, you should consider the acceptability of anodized aluminum, that is, the surface tension of anodized aluminum is greater than the surface tension of UV varnish. If allowed, the hot stamping part of some products can be hollowed out. If you need to print UV varnish first and then hot stamping according to the process requirements, you should first check the hot stamping suitability of the surface of the UV varnish. Generally, use a dyne pen to test the UV varnish film layer. Carry out anodized aluminum stamping. 3. Selection of hot stamping materials and equipment Hot stamping materials and hot stamping equipment are the two most critical factors that affect the effect of hot stamping. â‘ Hot stamping materials The hot stamping material is anodized aluminum. There are many types of anodized aluminum on the market, including ceramic anodized aluminum and paper anodized aluminum. Glass anodized aluminum, etc .; complex grades, both domestically produced anodized aluminum in Shanghai, Zhejiang, Fujian and other real estate, and American-made. Imported anodized aluminum made in Japan and Germany has its own advantages and disadvantages. Here we mainly discuss paper anodized aluminum. The hot stamping suitability of anodized aluminum includes the surface finish, brightness and clarity, the hot stamping suitability for graphics and small text, the surface fly gold and burrs, etc., according to different printing materials, packaging product levels, anodized aluminum The choice between price and hot stamping suitability. â‘¡Hot stamping equipment The hot stamping equipment is widely used in China is the hand-swing hot stamping machine, the main hot stamping requirements are not very high packaging products. It has low cost. It has the advantages of small footprint, easy operation, and strong suitability for hot stamping. However, for products that require higher precision in hot stamping, the error is larger and the reject rate is higher. If the hot stamping packaging box is used, most domestic printing companies choose the Bost hot stamping machine. The hot stamping accuracy is very high, and the control of hot stamping temperature, pressure and speed is also better than other hot stamping machines. At present, some domestic hot stamping machines are also very accurate, and the price is much cheaper than imported high-end equipment. Printing after ironing Post-press printing is a top-notch technology, which is widely used in cigarette pack printing, and its three-dimensional effect is beyond the reach of other processes. Post-iron printing is generally to stamp a large area of ​​laser anodized aluminum on spot color ink, and then print UV ink on the anodized aluminum. Its on the printing materials. The requirements of printing ink, printing equipment and printing personnel are relatively high. The following points should be noted in this process: â‘ Choose anodized aluminum with a surface tension of (4.0-4.6) X10-2N / m to ensure good adhesion of the ink. â‘¡During the hot stamping process, it should be noted that paste printing is not allowed for hot stamping. Anti-pull, hot stamping and other phenomena. Otherwise, the anodized aluminum stamped during the second printing will fall off and accumulate on the blanket, seriously affecting product quality and production efficiency. â‘¢ Comprehensive consideration of printing, hot stamping and post-hot stamp printing. It is appropriate to control the ambient temperature and humidity of the workshop, and try to avoid human factors to cause newspapers â‘£ When designing, you should pay attention to whether it is possible to hollow out or separate hot stamping in large area hot stamping to reduce the difficulty of hot stamping. Hot stamping anti-counterfeiting With the development of society, people pay more and more attention to the anti-counterfeiting of high-end products. Anti-counterfeiting has been applied to the entire packaging industry, such as ink anti-counterfeiting, printing pattern anti-counterfeiting, paper anti-counterfeiting, hot stamping anti-counterfeiting, UV oil anti-counterfeiting, etc. Hot stamping anti-counterfeiting is relatively demanding. A kind of anti-counterfeiting technology with complicated control, here mainly introduces two anti-counterfeiting methods. â‘ The laser pattern carried by the anodized aluminum itself, by transferring the hot stamping pattern to the substrate, makes the stamping surface of the substrate bear various rainbow patterns, thus playing a role of anti-counterfeiting. This type of anodized aluminum process is more advanced, more difficult to produce, and more expensive, which makes copyers discouraged. â‘¡Using the holographic anti-counterfeiting pattern on the anodized aluminum, the complete pattern is positioned on the pattern fixed by the substrate through mechanical control. This process uses hot stamping. The trinity of holographic anti-counterfeiting anodized aluminum pattern and substrate pattern for positioning registration is relatively difficult. Because hot stamping anti-counterfeiting is a relatively new technology: the operator has higher requirements and must be reasonably controlled to minimize unnecessary waste. [next] Technological process of screen printing bronzing method Gorgeous and beautiful, bright color anodized aluminum, hot stamping machine hot stamping, displayed on the substrate, its beautiful color has won widespread praise. With the development of the printing industry, today's printed products are focused on hot stamping golden patterns on the surface of the printed products. Such as: book covers, account book covers, invitations, business cards, couplets, etc. Based on years of experience, a simple and low-cost bronzing method is summed up, which is the screen printing bronzing method. This hot stamping method can be compared with the past zinc and copper plate hot stamping methods. Zinc and copper plate hot stamping methods are more costly and have a longer cycle of making hot stamp plates than screen printing hot stamping methods. Screen printing hot stamping methods have a short time and low cost. No matter how complex the pattern is, as long as the computer outputs the hot stamp The film can be plated and hot stamped. The hot stamping method can stamp patterns on metal, wood, bamboo, paper, glass, cloth, plastic, leather, stone, etc. Technological process: patterned film → screen printing plate → hot stamping paste → hot stamping → finished product 1. Production of pattern negatives. Use a computer to discharge the required graphics and text, and use a laser printer to output. 2. Silk screen. Use 100-200 mesh polyester silk screen and water-oil sexy photo-resin to make the plate, according to different hot-stamping materials, choose different bronzing glue. The bronzing glue is divided into water-based and oily. The water-based bronzing glue is suitable for hot stamping on paper and cloth materials. Oil-based bronzing glue is suitable for non-paper, cloth materials hot stamping. In order to make the hot stamping firm, non-paper and cloth materials must use oil-based hot stamping glue. So when making a screen version, choose water and oil sexy photoresist plate. No matter it is paper, cloth material, non-paper, cloth material, it can use water-oil and light-sensitive photoresist plate, printing bronzing glue. 3. Printing hot stamping glue, according to different hot stamping materials to choose different hot stamping glue, after selecting the hot stamping glue, the pattern needed for printing is to be dry stamped. The pattern should be clear when printing. 4. Hot stamping. Put the anodized aluminum of the required size on the material of hot stamping, and then hot stamp, pay attention to the temperature control at 60 ℃. The hot stamping equipment uses hot stamping machine or electric iron and other hot stamping. After a few seconds of hot stamping, after cooling, the excess anodized aluminum on the hot stamping material is slowly torn off, showing a dazzling pattern. Through the screen printing bronzing method, bronzing crafts, couplets, calligraphy and painting, art mirrors, etc. can be produced. Matters needing attention in the hot stamping process In China, anodized aluminum hot stamping has become an indispensable method of surface decoration in modern packaging, but in addition to the packaging carton must have a good-looking, or eye-catching, or eye-catching effect, but also to convey certain product information, need to have Conducive to the display of the shape, it must have the function of protecting the goods. To achieve the above purpose, the birth of a packaging carton needs to go through printing, hot stamping, glazing (UV glazing, water-based glazing, ink glazing, etc.), laminating (pre-coating film dry coating, namely glue coating) Wet lamination), mounting, die-cutting indentation, folding and gluing boxes and other processing procedures. Faced with such a complicated processing process and so many choices, how to apply the hot stamping process reasonably to make it complement each other's processing technology is a very deep knowledge, which requires the process designer and the operators of each process to gradually explore, Collaborate to solve. However, anodized aluminum hot stamping is a relatively complicated processing technology, which is affected and restricted by materials, equipment and process conditions. Therefore, the current overall level of hot stamping in China is not too high and there are many problems. Below we summarize and summarize some issues that need attention in hot stamping. 1. Reasonable selection of anodized aluminum When choosing anodized aluminum, we must pay attention to match with the hot stamping substrate. For example, the common Venus 400 anodized aluminum imported from the United States is not suitable for hot stamping on the ink layer, while the 338 type anodized aluminum imported from Germany and the 88 type anodized aluminum produced by China's Shanghai hot stamping material factory are both It has a better combination fastness with the printing ink layer. Some other domestic brands of anodized aluminum also have models suitable for hot stamping on the ink layer. When users choose anodized aluminum, in addition to considering the color and price of anodized aluminum, the hot stamping base material and its surface state (whether it is on the printing ink layer, glazing surface or laminating surface) must be reported to the supplier Clarified. 2. Determination of hot stamping process conditions Moderate stamping pressure, stamping temperature and stamping time are the three prerequisites for good stamping quality. The stamping temperature and stamping time can be coordinated with each other within a certain range. For example: when the hot stamping temperature is slightly lower, you can make up by reducing the hot stamping time; and when the hot stamping temperature is slightly higher, you can match by reducing the hot stamping time. At present, neither the materials used in hot stamping nor the hot stamping process in China are standardized. Since there are no regulations in this regard, many printing plants are very random when processing. Strictly managed printing factory, after a period of practice, will find a set of process conditions suitable for the actual situation of the factory: experienced hot stampers who pay attention to accumulation can spray water by hand even without a temperature display Quickly touch the plate to determine whether the hot stamping temperature is appropriate. The adjustment of hot stamping pressure should be flexibly controlled according to the layout. Large areas of hot stamping require more pressure, while small text and lines require less pressure. When there are both large-area hot stamping parts and small text to be hot stamped on the same layout, local padding can be used to make up for both. If you do not consider the layout factor, the entire page is stamped with the same pressure, which will inevitably cause a large area of ​​hot stamping effect and small text paste, or the small text is stamped clearly and the large area of ​​the hot stamping area is not firmly attached. [next] 3. Selection and processing of hot stamping plates The hot stamping plate is best made of red copper material, because red copper has better heat dissipation and heat transfer properties, and it is a neutral material in metal. It is neither too soft nor too hard. It is not only easy to process, has a certain elasticity, and is resistant High printing power, generally up to 50,000 printings. Now many domestic printing factories are still using zinc or aluminum to make hot stamping plates, the reason is that the zinc plate processing cost is low. Some small printing houses don't even know that there are red copper hot stamping plates. In fact, as far as a hot stamping plate is concerned, the processing cost of the zinc plate is lower, but the zinc plate is too soft, and the printing resistance is only 5000 to 6000 prints. If it exceeds 8000 prints, the zinc plate will be seriously deformed. The packaging prints are generally more than tens of thousands of prints. If you use a zinc plate, you need to prepare multiple plates at the same time. The plate-making costs are not necessarily saved, but a lot of time is wasted on installing plates. The thickness of the hot stamping plate is also particular. The thickness of the hot stamping plate is preferably 1 to 1.5mm. Before using the hot stamping plate, you must first check the degree of corrosion, see if the genuine light is not light, and use a fine sandpaper to beat the light; the back of the plate should be polished with coarse sandpaper to facilitate the sticking of the machine. When sticking the plate, a layer of 150g / m2 coated paper should be sandwiched between the hot plate and the bottom plate of the bronzing machine. The two sides of the coated paper should also be sanded with sandpaper, so that the hot stamping plate installed on it is sticky and easy to use. 4. Hot stamping equipment At present, there are various hot stamping equipment used in China, including high-speed high-speed round and flat stamping machines with high automation level, modified round flat stamping machines, semi-automatic or manual flat stamping machines, tiger mouth hot stamping machines Application is more common. For manual stamping machines, experienced workers can match the temperature of the stamping machine with the stamping time. However, for the automatic hot stamping machine, because the temperature control of the hot stamping machine depends on the thermostat, the running speed of the equipment is pre-set. Adjustment and matching of temperature and hot stamping time. But now there are many thermostats of hot stamping machines that are simply not closed. After a period of time, the displayed temperature will be very different from the actual working temperature. There is a printing factory in Beijing that once rushed to hot work overnight. The temperature displayed on the hot stamping machine was 135 ℃, while the actual hot stamping temperature was only 90 ℃, and the deviation was as high as 45 ℃. I would like to ask, if you blindly believe in the so-called high-tech and automation and are bound by it, how can you stamp good products? Here I also remind everyone to note that if the automatic hot stamping temperature is set according to the temperature data provided by the hot stamping material supplier in actual work, but the hot stamping is not strong, then it should be considered that the temperature display of the hot stamping machine The device deceives your eyes, you might as well try to increase the stamping temperature little by little until the stamping result meets the requirements.
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