Mr. Sam Mc Elree, product and sales manager of KURZ Transfer Products, pointed out: “Packages of perfume, chocolate, chewing gum, film, CDs, DVDs, cigarettes, and food are just like the exquisite labels of wine, champagne and liquor [encyclopedia]. The need for a high level of design. With the intensification of market competition, the promotion of packaging has become more and more important. In general, eye-catching packaging and the use of holographic foil to achieve brand awareness." At present, hot stamping has become an important method for surface finishing of metallic effects, and it is an effective way to enhance the visual effects of labels, paper boxes, and trademarks, and has been widely used. Hot stamping methods mainly include hot stamping and cold stamping. Both of them have their own advantages and disadvantages. Therefore, in practical applications, suitable stamping methods should be selected according to specific conditions, especially in balancing the cost and quality. More attention should be paid.
Hot Stamping Technology
Hot stamping technology refers to the use of a dedicated metal hot stamping plate to transfer the hot stamping foil to the surface of the printing material by heating and pressing. Advantages and Disadvantages of Hot Stamping Technology The advantages of hot stamping technology mainly include the following points: (1) Good quality, high precision, sharp and sharp edge of hot stamping image; (2) High surface gloss, bright and smooth hot stamping pattern (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 The advantage is that stereo stamping can be performed.
Using computer numerical control engraving (CNC) method to create a three-dimensional hot stamping version, so that the hot stamping process into a graphic with a clear three-dimensional level, in the printing of [encyclopedia] product surface relief effect, and produce a strong visual impact. Three-dimensional hot stamping allows the package to have a unique feel. It is the hot stamping process that has many advantages as mentioned above, and it is widely used by users and consumers.
However, the hot-stamping process requires the use of special equipment, the need for a heating device, and the need for a hot stamping plate. Therefore, obtaining a high-quality hot stamping effect also means paying a higher cost.
Mr. Chris Corbett, International Sales Manager of ITWFoilmark, pointed out that the price of rotary hot stamping cylinders is relatively high, which accounts for a large proportion of the cost of hot stamping processes. It is the main cost factor for 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 reduced to a great extent, and a drop of up to 50%.
In addition to lowering the cost of the stamping cylinder, hot stamping system suppliers have also challenged the hot stamping speed limit. Previously, due to the limitations of the hot stamping speed, most of the hot stamping work was done off-line, and the situation is now quite different. A few years ago, the hot stamping machine's hot stamping speed reached less than 5,000 sheets/hour. At present, regardless of whether it is a platform-type hot stamping machine or a roller-type hot stamping machine, the speed can reach 7500 to 12,000 sheets/hour. Of course, the speed of hot stamping is also related to the type of machine used. The continuous increase in production speed has greatly reduced the cost of hot stamping.
One of the development trends of hot stamping technology in the future is online hot stamping. The improvement of the chemical properties of the hot stamping foil provides a reliable guarantee for the rapid increase of the stamping speed. Therefore, the 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, sheet-fed folding carton printing is moving in the direction of web printing, which also creates conditions for on-line hot-stamping processes.
Another development trend of the hot stamping process is the first hot stamping, that is, after the stamping, the overprinting is performed on the hot stamping foil. The first hot post-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 first hot post-printing process can provide more excellent decorative effects and enhance the visual appeal of the image. After printing, opaque or transparent color inks are overprinted to achieve fascinating results, providing package designers with endless design solutions and providing designers with ample space to fully express their creative talents.
Cold Stamping Technology
Cold stamping technology refers to the use of UV adhesive to transfer the stamping foil to the printing material. The cold stamping process can be further divided into dry film cold stamping and wet film cold stamping. The dry film-covering cold stamping process is to cure the applied UV adhesive before the stamping. Ten years ago, when the cold stamping technology was just introduced, the cold film hot stamping process was used. The main process steps were as follows: (1) The cationic UV adhesive was printed on the roll printing material; (2) UV adhesive curing; (3) Compress the cold stamping foil with the printing material by means of the pressure roller; (4) The excess hot stamping foil is peeled from the printing material, leaving only the adhesive coated part The required hot stamping text.
It is worth noting that the use of dry film cold stamping process, the UV adhesive curing should be fast, but can not be completely cured, to ensure that it still has a certain viscosity after curing, so that it can be very hot stamping foil Bonding together well. The wet film-covering cold stamping process is after the UV adhesive is applied, the first hot stamping and then the UV adhesive curing, the main process steps are as follows: (1) free radical UV printing on the web printing material Adhesives; (2) Composite cold stamping foils on printing materials; (3) Curing free radical UV adhesives, since the adhesive is now sandwiched between the cold stamping foil and the printing material, the UV light must be To reach the adhesive layer through hot stamping foil; (4) to peel off the hot stamp foil from the printing material and form a hot stamping graphic on the printing material.
It should be noted that: First, the wet film-covering cold stamping process replaces the traditional cationic UV adhesive with a free radical UV adhesive; second, the UV adhesive has a strong initial adhesive force and cannot be cured after curing. Adhesive; Third, the aluminum foil of the stamping foil should have a certain light transmission, so as to ensure that the UV light can pass through and trigger the UV adhesive curing reaction. The wet film-covering cold stamping process can connect hot stamping metal foils or holographic foils on a printing press, and its application range is also becoming wider and wider. At present, many narrow-width paper boxes and label flexographic printing presses already have such cold hot stamping capability.
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