(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 normal 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 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 printing force, it is only about 100,000 impressions, so it is commonly used in some packages that do not require high relief effect. 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 computers and software; the formation of a gravure intaglio plate with rich three-dimensional patterns. 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 making three-dimensional hot stamping with high quality and large quantity. 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-counterfeit features, such as cigarette packs, wine bags, health product packaging and greeting cards, etc., it is suitable for three-dimensional hot stamping. In the past, such hot stamping plates had to be processed abroad. The cost was high and the delivery was not timely. The design effect was 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 a male mold relief corresponding to the hot plate, that is, the concave part 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 are plaster and glass fiber. If gypsum is used, it needs to be completed on the machine. Therefore, the process is more complicated and the replacement of the bottom plate is troublesome, but the cost is low, and it is now 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, and it must accurately correspond to 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, and the three-dimensional 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. This results in the mismatch between the hot stamping plate and the bottom mold relief plate, resulting in a crushing 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.
Stamping 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 efficiency of production. Decoration and anti-counterfeiting features have been greatly improved. Therefore, this 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.