Three-dimensional gold foil packaging process and technical characteristics
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Hot stamping and three-dimensional hot stamping
1. Hot stamping
The bronzing is the use of a certain pressure and temperature, using the stencil installed on the stencil, so that the printed matter and the hot stamping plate are pressed together in a short time, and the metal foil or the color pigment foil is turned according to the graphic requirements of the hot stamping stencil, and printed thereon. The surface of the hot material is processed. Since hot stamping is based on gold and silver, it is often called bronzing. This technology is an important process for increasing the visual effects and grades of labels, trademarks, cigarette packets, wine bags and various high-end packaging boxes. From the process can be divided into the first hot after printing and printing after the first hot. The first hot stamping is to print the foil on the blank substrate first, and then print the graphic on the surface of the aluminum foil layer, which is mostly used for packaging printing that requires large area hot stamping. The first printing and then the hot is printed on the printed matter, in the hot stamping part of the hot stamp on the desired pattern, this is a widely used technology. From the hot stamping method, it can be divided into hot stamping technology and cold stamping technology. Hot stamping technology is the hot stamping process mentioned above that requires a certain temperature and pressure to complete the transfer of galvanized aluminum foil. The cold stamping technology is a process of transferring the electro-aluminum foil to the surface of the packaged printed matter by applying a Uv adhesive to a part where the printed matter needs to be stamped. These two methods have their own characteristics to meet the requirements of different products.
2. Three-dimensional hot stamping
The three-dimensional bronzing technology is a composite technology combining bronzing technology and embossing and embossing technology. It is the use of corrosion or engraving technology to make the bronzing and embossing graphics into a concave and a convex mold with a positive and a negative mold. Embossing technology once completed the process. This process also completes bronzing and embossing at the same time, which reduces the number of waste products that are not allowed to be processed and overprinted, and increases productivity and product quality.
Since the three-dimensional hot stamping is a combination of hot stamping and embossing and embossing, the resulting product is a three-dimensional pattern in an embossed shape and cannot be printed on it. Therefore, it is necessary to adopt a process of printing and hot stamping first, and at the same time, due to its high precision. And high quality requirements, not suitable for cold stamping technology, but more suitable for hot stamping technology.
Three-dimensional hot stamping technology and features
The three-dimensional bronzing technology is quite different from the ordinary bronzing. In addition to the three-dimensional pattern that can form an embossed pattern, there are differences in plate making, temperature control, and pressure control.
1. Plate making
(1) Ordinary hot stamping version
The high-quality hot stamping version guarantees the quality of the hot stamping. The ordinary hot stamping version is relatively simple to produce, mainly adopting a photo etching process and an electronic engraving plate making process. Commonly used plates are copper plates or zinc plates. Due to fine texture, smooth surface, good heat transfer performance, wear resistance, and not easily deformed, the copper plate is currently the mainstream hot stamping plate. The use of high-quality copper plates enhances the gloss and clarity of hot stamping graphics. However, zinc printing plates can also be used for hot stamping of packaging prints with few hot stamping and low quality requirements.
Photo etching plate making is a traditional manufacturing method with simple process, low cost, and low precision, and is mainly applicable to images whose characters, bold lines, and quality are not high. The hot stamping plate made by electronic engraving can express the image level richly and finely, and it can reproduce the fine lines and graphics with uneven thickness, but it is relatively expensive.
(2) three-dimensional hot stamping version
The production principle of the three-dimensional hot stamping printing plate is the same as that of the ordinary hot stamping plate, but it is more complicated than the ordinary printing plate because it needs to form a three-dimensional relief pattern. The hot stamping plate is generally concave and has a depth and depth change, and the depth is also higher than that of the ordinary hot stamping. Plates are deeper and more accurate. At present, the copper plate photographic etching method is mainly used in China. This method has the advantages of low cost and simple process, but it is only suitable for flat hot stamping, due to poor three-dimensional sense, short service life, and resistance to India force only about 100,000 India, so commonly used in some of the requirements of the relief effect is not high packaging Product only.
At present, the use of carved brass plates is widely used in foreign countries. Scanners are required to first scan the pattern to be stamped, store the data in a computer, and then carry out three-dimensional engraving through the control of a computer and software; a gravure intaglio plate with a rich three-dimensional pattern is formed. Because it is controlled by a computer, it can form a very fine pattern, and it is more ideal for the subtle parts. The resistance force can reach more than 1 million prints, so it is very suitable for the production of high-quality hot stamping with high quality. Die intaglio. Of course, due to the need to provide high-end electronic engraving machines, scanners, computers and software, engineering and technical personnel, etc., the production cost is higher than the photographic corrosion method. Because of its complicated production and technical difficulty, it can prevent some counterfeit companies from counterfeiting and have certain anti-counterfeiting functions. Therefore, for some long-lived products with high quality and requiring anti-counterfeiting features, such as cigarette packs, wine bags, health products packaging and greeting cards, etc., it is appropriate to use three-dimensional hot stamping. In the past, such hot stamping plates had to be processed abroad, the cost was high, delivery was not timely, and the design results were also unsatisfactory. At present, a small number of manufacturers in China have been able to process this hot stamping version, which has effectively reduced the cost. In particular, direct communication between the processing manufacturer and the design personnel can correctly understand the design intent and achieve satisfactory results.
(3) Counters Letterpress
Stereoscopic bronzing is different from ordinary gilding. The ordinary gilding plate is flat and does not require special production. The bottom plate of the three-dimensional bronzing must be the positive mold platelet corresponding to the hot plate, that is, the concave area of ​​the hot plate should be on the bottom plate. It is convex, and the height of the bulge corresponds to the depth of the hot plate depression. The method for making the bottom mold relief is the same as the method for making the male mold relief of the embossed stamp. The commonly used materials include plaster and glass fiber. If you use gypsum, you need to complete the production on the machine. Therefore, the process is more complicated and the replacement of the bottom plate is troublesome. However, the cost is relatively low. Now it is more commonly used in China. If glass fiber is used, it can be prefabricated according to the model of the hot stamping plate, and the positioning holes can be made with the processed copper plate to facilitate the replacement of the positioning.
The bottom mold relief is to form a three-dimensional relief pattern in order to cooperate with the stamping gravure, which must exactly correspond with the hot stamping version. However, the three-dimensional hot stamping is different from the embossing and embossing. Most of the embossing and embossing do not require heating, while the three-dimensional hot stamping must be heated at high temperature During hot stamping, as the temperature rises, the hot stamping plate expands, but the temperature of the bottom mold stamping remains basically unchanged, which results in the mismatch between the hot stamping plate and the bottom mold relief plate, resulting in crushing the bottom mold. Or can not hot stamping phenomenon. Therefore, when making the bottom mold relief, the expansion rate of the hot stamping plate should be fully taken into account to make an accurate bottom mold relief plate.
The bronzing and embossing techniques are traditional post-printing techniques and are indispensable in packaging and decorating. Now that they are used together, they not only reduce the number of production processes, but also increase the production efficiency and quality of the product packaging. Decoration and anti-counterfeiting features have been greatly improved. Therefore, this kind of technology now shows a strong momentum of development. With the maturity of various conditions, it will gradually replace the process of forming a three-dimensional gold pattern by two processes: bronzing and embossing. The three-dimensional hot stamping process will become a very promising decoration technology in the field of post-press packaging and decoration.