Brief analysis of hot and cold hot stamping technical standards
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. Advantages and disadvantages of hot stamping technology The advantages of hot stamping technology mainly include the following: (1) good quality and high precision, the edges of the hot stamping image are clear and sharp; (2) the surface gloss is high, and the 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) hot stamping process also has a highlight The advantage is that it can carry out three-dimensional hot 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.
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.
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. 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.
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 was first introduced, the dry film cold stamping process was used. The main process steps are as follows: (1) printing cationic UV adhesive on the roll printing material; (2) UV adhesive curing; (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 part coated with the adhesive The required hot stamping text.
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 hot stamping foil It sticks together well. The wet lamination cold stamping process is to apply UV adhesive, hot stamping first and then curing the UV adhesive. The main process steps are as follows: (1) Printing free radical UV on the roll substrate Adhesive; (2) Composite cold stamping foil on the printing material; (3) Curing free radical UV adhesive, because the adhesive is now sandwiched between the cold stamping foil and the printing material, UV light must be Only through the hot stamping foil can the adhesive layer be reached; (4) The hot stamping foil is peeled off from the printing material, and the hot stamping graphic is formed 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.
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