Core tip: in recent years, along with the people to the commodity packaging exterior styling and quality requirements improve, printing technology, packaging technology have great progress, finishing technology is achieved rapid development, and anodized hot stamping as a part of the finishing, changes over the past few years is huge. New technology, new technology and a variety of technology combined with the use of emerging, packaging and printing products after stamping in gloss, three-dimensional sense, metal feeling, anti-counterfeiting performance has achieved good results, especially in the more and more extensive application of stereoscopic stamping technology, so that the packing of goods is high-grade and elegant, rich and full of personality. At present, the technology is mainly used for greeting cards, bookmarks, trademarks, tobacco packaging and a variety of high-grade packaging box.
[China Packaging Network News] in recent years, along with the people to the commodity packaging exterior styling and quality requirements improve, printing technology, packaging technology have great progress, finishing technology is achieved rapid development, and anodized hot stamping as a part of the finishing, changes over the past few years is huge. New technology, new technology and a variety of technology combined with the use of emerging, packaging and printing products after stamping in gloss, three-dimensional sense, metal feeling, anti-counterfeiting performance has achieved good results, especially in the more and more extensive application of stereoscopic stamping technology, so that the packing of goods is high-grade and elegant, rich and full of personality. At present, the technology is mainly used for greeting cards, bookmarks, trademarks, tobacco packaging and a variety of high-grade packaging box.
Process requirements for solid gold foil stamping:
The aluminum foil
Aluminum foil generally consists of 4 ~ 5 layers of different materials, such as: basal layer (polyester film), peeling, coloring layer (silver anodized without coloring layer), aluminum plating layer, an adhesive layer.
The main function of each layer is:
The basal layer mainly plays the supporting role of other level.
The function of the stripping layer is to separate the electrochemical aluminum foil layer from the base layer, which determines the transfer of the electrochemical aluminum layer.
The main function of the coloring layer is to display the color and protect the bottom. Common colors: gold, silver, brown, blue, black, red, green, and other, which gold and silver is the most commonly used two.
The aluminized layer is the role of showing metallic luster.
The adhesive layer is the role played the role of hot stamping adhesive materials.
Composition of the adhesive layer of adhesive materials, the bonding is also different. In order to meet the different surface properties of different hot stamping materials, electrochemical aluminum will use different bonding layer, thus forming different types of electrochemical aluminum.
Printing speed and quality is mainly affected by the influence of peeling layer and adhesive layer, if the coating of heat sensitive enough, hot stamping and speed will reduce the corresponding. Previously, due to the limited by the rate of heat transfer, flat hot stamping speed low, are not up to 5000 copies /, but now some of the world's leading anodized supplier enable the production of anodized aluminum have been sufficient to meet the requirements of industry of printing speed,
The temperature, pressure, speed
Temperature, pressure and speed are hot stamping technology of the three elements, only control the relationship between the three, in order to control the quality of hot stamping, three-dimensional stamping is the same. Due to the three-dimensional stamping is a complete stamping and embossing embossing, the requirements on the temperature is higher, the general hot stamping temperature as long as 70 degrees to 90 degrees Celsius, and three-dimensional hot stamping is about 150 degrees to complete. If the temperature is too low is anodized aluminum adhesive layer and the release layer can not be fully melted, hot stamping anodized aluminum foil can not complete transfer, produce stamping or threadbare. While the temperature is too high will appear to be excessive, graphics and text, paste paper deformation, illegible, and even the emergence of the phenomenon of anodized chromotropic. At the same time it may due to the high temperature of the short-run version of inflation too much, rather than a precise and bottom mold with, produce short-run adverse phenomenon. So the control of temperature is the first of the three elements.
Hot stamping pressure is refers to the hot stamping plate layout of the pressure by the pressure. In hot stamping process, the melting of the anodized aluminum adhesive layer is by the pressure to complete the transfer of anodized, so the size of the pressure and uniformity directly affect the quality of the short-run. And stereo bronzing in addition to the requirements of aluminum foil is transferred to the printing surface, but also with great pressure in hot stamping parts extruded three-dimensional embossed pattern, so the pressure to more than common bronzing, which also requires the strength of hot gold foil to be better, to be able to withstand the strong pressure of extrusion. Of course, this is not to say that the greater the pressure the better, must be appropriate, the pressure is too large or too small are unable to get fine patterns. Stress may be crushed hot gold foil, and crush the base mould and stay hot printed; and the pressure is too small may produce hot gold foil transfer incomplete or stamping, pressure concavoconvex stereo sense of relief not up to quality requirements. Therefore, the pressure control is also very important.
Hot stamping speed is in fact hot stamping and electrochemical aluminum contact time, that is, the heating time of anodized aluminum. Hot stamping speed, short heating time, hot stamping temperature drops quickly, resulting in low temperature, hot stamping and fastness will be affected; printing speed is slow, long heating time, hot stamping and drop slowly, hot stamping and fastness, but if the control is not good will cause high temperature hot stamping of fault. Therefore, suitable for hot stamping speed is also a guarantee of high quality hot stamping effect.
Stamping and embossing technology are traditional prepress processing technology, and is an integral part of the packaging and decoration process, now a combination of the two together