In recent years, as people have improved the appearance and quality requirements of product packaging, printing technology and packaging technology have made great progress, and post-press processing technology has achieved vigorous development, while hot stamping of aluminum foil is used as post-press. As part of the process, the changes in recent years have been even greater. The continuous emergence of new technologies, new processes and the combination of multiple technologies has enabled the printed products to achieve good results in terms of glossiness, three-dimensionality, metallic sensation, and anti-counterfeiting performance after hot stamping, especially for the current applications. A wide range of three-dimensional hot stamping technology makes the packaging of goods appear high-end fine, magnificent and full of personality. At present, the technology is mainly used for greeting cards, bookmarks, trademarks, tobacco and wine packaging and various high-grade packaging boxes.
Hot stamping and three-dimensional hot stamping
1. Hot stamping
Bronzing is the use of a certain pressure and temperature, using a stencil mounted on the stamping machine, so that the printed matter and hot stamping press in a short time, the metal foil or color pigment foil according to the hot stamping template requirements, printed 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-grade 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 the 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 simultaneously completes bronzing and embossing, reducing the number of rejects that are not allowed in the processing process and overprinting, and improves productivity and product quality.
Since the three-dimensional hot stamping is a combination of hot stamping and embossing and embossing technology, the resulting product is a three-dimensional pattern in an embossed shape and cannot be printed on it again. Therefore, it is necessary to adopt a process of printing first and then hot, 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 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 now 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 produced by the electronic engraving can express the image level richly and delicately, and can reproduce the fine lines and graphics with uneven thickness, but the relative cost is high.
