In order to attract consumers 'attention and stimulate consumers' desire to buy, the packaging of commodities nowadays is getting brighter and dazzling. When customers buy products, their eyes stay on each product for more than 1.8 seconds, and a medium-sized supermarket has no less than 30,000 products. In order to grab the attention of customers, novel and unique packaging has become an important business. Killer experience. When you shop or hang out in supermarkets or shopping malls, you will find that metal effects and holographic effects are more and more widely used in packaging products. Mr. SamMcElree, Product and Sales Manager of KURZ Transfer Products, pointed out: "The packaging of perfumes, chocolates, chewing gums, films, CDs, DVDs, cigarettes and foods is the same as the fine labels of wine, champagne and liquor. Design. With the intensification of market competition, the promotion role of packaging has become greater and greater. In general, eye-catching packaging and the use of holographic foil to achieve brand recognition. " At present, hot stamping has become an important metal effect surface finishing method, is an effective way to enhance the visual effects of labels, cartons, trademarks and other products, and is widely used. Hot stamping methods mainly include hot stamping and cold stamping, both of which have their own advantages and disadvantages. Therefore, in actual application, the appropriate hot stamping method should be selected according to the specific situation, especially in weighing cost and quality. Should pay more attention to. Hot stamping technology Hot stamping technology refers to the use of special metal hot stamping plates to transfer hot stamping foil to the surface of the printing material by means of heating and pressure. 1. The advantages and disadvantages of hot stamping technology The advantages of hot stamping technology mainly include the following points. (1) Good quality, high precision, clear and sharp edges of hot stamping images. (2) The surface gloss is high, and the hot stamping pattern is bright and smooth. (3) Wide selection of hot stamping foils, such as hot stamping foils of different colors, hot stamping foils with different gloss effects, and hot stamping foils suitable for different substrates. (4) Another outstanding advantage of the hot stamping process is that it can be used for three-dimensional stamping. The computer-controlled numerical control engraving and plate-making (CNC) method is used to make a three-dimensional hot stamping plate, so that the graphics and text processed by the hot stamping have a clear three-dimensional level, forming a relief effect on the surface of the printed matter, and generating a strong visual impact effect. Three-dimensional hot stamping can make the packaging have a unique touch. It is precisely because of the above-mentioned advantages of the hot stamping process that it is favored by the majority of users and consumers and is widely used. However, the hot stamping process requires special equipment, a heating device, and a hot stamping plate. Therefore, obtaining a high-quality hot stamping effect also means paying a higher cost. Mr. Chris Corbett, manager of ITWFoilmark's international sales department, pointed out that the price of rotary hot stamping cylinders is relatively high and accounts for a large proportion of the cost of hot stamping processes, which is the main cost factor of hot stamping processes. At the same time, he also pointed out that in the past five or six years, the price of hot stamping cylinders has been greatly reduced, and the decline has been as high as 50%. In addition to reducing the cost of hot stamping cylinders, hot stamping system suppliers have also challenged the speed limit of hot stamping. In the past, due to the limitation of the speed of hot stamping, most of the hot stamping work was done offline, and now the situation is very different. A few years ago, the hot stamping machine's hot stamping speed was less than 5,000 sheets / hour. At present, whether it is a platform hot stamping machine or a drum hot stamping machine, the speed can reach 7500 to 12,000 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 hot stamping. 2. Development trend of hot stamping technology One of the future development trends of hot stamping technology is online hot stamping. The improvement of the chemical properties of hot stamping foil provides a reliable guarantee for the substantial increase in hot stamping speed. Therefore, the current hot stamping process can already be completed online, and the application of online hot stamping process will become more and more common in the future. In addition, single-sheet folding carton printing is developing in the direction of web printing, which also creates conditions for the online hot stamping process. 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. [NextPage] Cold stamping technology Cold stamping technology refers to the method of transferring hot stamping foil to the printing material using UV adhesive. The cold stamping process can be divided into two types: dry film cold stamping and wet film cold stamping. The dry lamination cold stamping process is to cure the coated UV adhesive before hot stamping. Ten years ago, when the cold stamping technology had just come out, the dry lamination cold stamping process was used. The main process steps are as follows. (1) Print cationic UV adhesive on the web printing material. (2) Curing the UV adhesive. (3) Use the pressure roller to make the cold stamping foil and the printing material together. (4) Peel off the excess hot stamping foil from the printing material, leaving only the required hot stamping text on the part coated with adhesive. It is worth noting that when using the dry film cold stamping process, the curing of the UV adhesive should be carried out quickly, but it cannot be cured completely. It must be guaranteed that it still has a certain viscosity after curing, so that it can be very compatible with the hot stamping foil. It sticks together well. The wet lamination cold stamping process is to apply UV adhesive and then hot stamping and then curing the UV adhesive. The main process steps are as follows. (1) Print free radical UV adhesive on the web printing material. (2) Composite cold stamping foil on the printing material. (3) Curing the free radical UV adhesive, because the adhesive is now sandwiched between the cold stamping foil and the printing material, UV light must pass through the hot stamping foil to reach the adhesive layer. (4) Peel the hot stamping foil from the printing material, and form hot stamping graphics on the printing material. It should be noted that: first, the wet-laminated cold stamping process uses free radical UV adhesives to replace traditional cationic UV adhesives; second, the initial adhesive strength of UV adhesives is stronger, and can no longer be cured after curing It is sticky; third, the aluminum layer of the hot stamping foil should have a certain transparency, to ensure that UV light can pass through and initiate the curing reaction of the UV adhesive. The wet lamination cold stamping process can be used for hot stamping metal foil or holographic foil on the printing machine, and its application range is becoming wider and wider. At present, many narrow-width carton and label flexo printing machines already have this kind of online cold stamping capability. 1. Advantages and disadvantages of cold stamping technology The outstanding advantages of cold stamping technology mainly include the following aspects. (1) No special hot stamping equipment is required, and the price of these equipments is usually relatively expensive. (2) There is no need to make metal hot stamping plates, and ordinary flexible plates can be used. Not only the plate making speed is fast, the cycle is short, but also the production cost of hot stamping plates can be reduced. (3) Hot stamping speed is fast, up to 450fpm. (4) No heating device is required, and energy can be saved. (5) A piece of photosensitive resin plate can be used to complete the hot stamping of the mesh tone image and the solid color block at the same time, that is, the mesh tone image to be hot stamped and the solid color block can be made on the same hot stamping plate. Of course, just as the mesh tone and the solid color block are printed on the same printing plate, the hot stamping effect and quality of both may have a certain loss. (6) The application range of hot stamping base material is wide, and it can also be used on heat sensitive materials, plastic films, and in-mold labels. [NextPage] However, cold stamping technology also has certain shortcomings, mainly including the following two points. (1) Graphics and text for cold stamping usually need to be covered or glazed for secondary processing and protection, which increases the cost and complexity of stamping. (2) The coated high-viscosity adhesive has poor leveling and is not smooth, causing diffuse reflection on the surface of the cold stamping foil, affecting the color and gloss of the hot stamping graphics and text, thereby reducing the appearance of the product. Mr. J. Michael Rivera, Deputy General Manager of Sales of AMAGICHologrphics, said that although the cold stamping process cannot achieve the high precision and high definition of the hot stamping process, the cold stamping technology can bring many advantages to flexo printers, including: Less initial investment in equipment, lower platemaking cost, faster stamping speed, can be completed online on the printing machine, and can be used on materials that are not suitable for the hot stamping process (such as films without base, PET and plastic bags, etc.) Hot stamping, etc. On film and non-absorbent paper materials, cold hot stamping technology can achieve the best hot stamping effect. On the contrary, when performing cold hot stamping on porous materials with strong permeability, the effect is not too ideal. However, Mr. Rivera pointed out that some AMAGIC customers hot stamped on Raflatac Raflasilk matt PSA materials, and the feedback results are also quite good. Some customers can also get a better cold stamping effect by priming and gluing on matt paper materials. At present, cold stamping technology has become a strong competitor of hot stamping technology, and cold stamping technology is expanding from the narrow-width flexographic printing field to other printing processes, such as wide-format flexographic printing, relief printing, web offset printing and single Sheet offset printing, etc. For example, at Drupa2004, the Roland700 sheet-fed offset press equipped with the new PrindorInLine cold stamping device from Manroland was exhibited. Cold stamping technology provides new opportunities for printing companies. The biggest advantage is that there is little investment, or no investment at all. Another outstanding advantage is the high cost performance, which is also the biggest selling point of cold stamping technology. As a person in the industry said: "For customers, cold stamping technology has a high cost performance, can help customers increase the added value of products, and is very economical." In addition, because cold stamping technology does not need to make expensive hot stamping plates, Therefore, it is very suitable for the production of short-label and low-quality labels and proofing. However, compared with hot stamping technology, cold stamping technology still has certain defects in quality and needs to be further improved. Therefore, cold stamping technology is not very suitable for the processing of high-quality packaging and label products. By the way, it should be mentioned here that although gold and silver ink printing can also achieve a metallic luster decoration effect similar to hot stamping, and gold and silver ink printing technology has made great progress in recent years, but it still cannot be achieved. The strong visual impact of hot stamping or cold stamping technology. 2. Conditions required for cold stamping process In general, cold stamping can usually be used for jobs printed on UV flexo printing machines. The equipment and materials required for the cold stamping process are as follows. (1) Standard flexographic printing or relief printing unit. (2) Photosensitive resin plate and anilox roller, and there must be enough spare anilox roller to choose from. (3) The embossing roller with the hardness of HS90 must be able to be easily installed in the printing unit, and ensure that sufficient pressure is provided to ensure the smooth progress of hot stamping. (4) Hot stamping foil unwinding device and winding device. Pay attention to adjust the winding tension when cleaning the waste to avoid wrinkling or delamination of the hot stamping material. (5) Hot stamping foil. (6) UV adhesive. (7) UV curing system. The UV curing system must be as close as possible to the imprinting device in order to cure the UV adhesive in time after printing and hot stamping. Moreover, the power of the UV curing system is required to be at least 300W, and the UV lamp and reflector must be kept clean and free of UV varnish and dust impurities, so as not to affect the curing effect of the UV adhesive. (8) Peeling device. The peeling device is installed at the rear end of the UV curing system. In addition to peeling off the waste foil, the device can avoid the delamination of hot stamping foil before UV curing, and can also reduce the wrinkling and skew of the printing material. In addition, in order to obtain high-quality hot stamping products and higher profit margins, skilled operators are also required to be able to deal with and solve various problems in the production process, especially various problems related to UV systems. Conclusion In actual production, do you choose hot stamping technology or cold stamping technology? The answer is: it should depend on the specific situation. Using hot stamping technology can achieve the best stamping quality and stamping effect, but the cost is higher. Although the quality of cold stamping is not bad, it is inferior to hot stamping, but the cost is lower. No matter which hot stamping technology you use, you should pay attention to these two hot stamping technologies, because the price of hot stamping is being adjusted downward, and the quality of cold stamping is also constantly improving. Both hot stamping technologies are in continuous Progress and development. When deciding whether to invest in cold stamping technology, the printing enterprise must understand the actual situation of the company's printing machine according to the actual situation of the enterprise, because the cold stamping process means that a printing unit should be replaced by the cold stamping unit, and it needs to be installed. For the peeling device, if the number of color sets of the printing machine is not enough, it may affect the normal printing of the work. In addition, it is also necessary to determine whether the work is suitable for the cold stamping process. Carry out a careful study of the pictures and determine whether they can obtain the expected results after cold stamping. Printing companies can study with UV adhesive suppliers to test cold stamping, provide customers with more choices, and improve their ability to serve customers. On the basis of existing customers, it can also improve the company's own competitiveness and the potential for creating consumer demand for customers' products.
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Another development trend of the hot stamping process is to stamp first, then stamp, that is, overprint on the stamping foil. 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.