With the continuous development and evolution of cold stamping technology for offset printing connections, many offset printing machines are now equipped with a tower, which ensures the transportation and recycling of foil tape through reasonable mechanical structure design.
The cold stamping process for offset printing lines has caused a sensation in the industry since it was first launched in 2004. It has achieved rapid development in the past three years, which fully proves the great advantages of cold stamping for offset printing lines.
1. Comparison between offset hot stamping and traditional hot stamping
Both offset hot stamping and traditional hot stamping have great advantages in process flow, overprint accuracy, equipment, and application. In addition, the hot stamping of offset printing has another major advantage: greatly reducing the cost of storage and paper materials. In general, the metal foil used in traditional hot stamping contains a base material, and this base material generally includes two layers of material: the first layer is silver, coated with aluminum metal; the second layer is usually also coated with color , And glazed with aluminum metal. For traditional hot stamping, this means that whenever a new colored foil is used, the user must purchase a new hot stamping foil. This requires a large amount of storage of printed materials, consuming storage and material costs.
Comparison content 1. Technological process cold-pressing of offset printing connection: printing and metal foil transfer are completed in one pass, and printing auxiliary time is greatly reduced.
Traditional hot stamping: printing and metal foil transfer are two processes, requiring two auxiliary time, two groups of staff, time-consuming and laborious.
2. Cold-press connection of printing plate offset printing: ordinary printing plate is processed in the same way as printing ink.
Traditional hot stamping: a template engraved with special text or patterns. The plate material is relatively expensive and requires a separate hot stamping workshop.
3. Overprinting precision offset printing is cold-pressed: the printing and metal foil transfer are completed in one pass, and the overprinting accuracy is the same as that between the ink colors.
Traditional hot stamping: Overprinting must refer to the printed pictures and texts and cooperate with it.
4. The resolution of the offset printing is cold hot: the resolution of the plate can reach the resolution of the offset printing plate, so the resolution is only determined by the characteristics of the metal foil transfer.
Traditional hot stamping: Because the hot stamping pattern on the hot stamping plate is protruding, it is difficult to achieve fine graphics and texts, or even impossible. The finer the plate, the more expensive the price.
5. Cold-pressing of offset printing connection of imprinting equipment: two printing units complete the imprinting of metal foil, and can be flexibly converted (printing ink or metal foil imprinting).
Traditional hot stamping: a special hot stamping machine is required, which can only be used for metal foil stamping, not for printing ink.
6. Hot stamping temperature Offset hot stamping connection: at room temperature, without special adjustment and control of temperature.
Traditional hot stamping: generally at 70-120 degrees, too high hot stamping temperature will cause the hot stamping pattern to lose its metallic luster, blistering, unclear edges, illegible writing, or even hot stamping, so temperature control is crucial , Is also the difficulty of its craft.
7. Hot stamping speed Offset hot stamping connection: Only use special printing materials and urgent special metal foils to reduce the speed according to the specific situation.
Traditional hot stamping: according to different types of equipment, the general speed is 2000-8000 sheets / hour.
8. Scope of application: Cold stamping of offset printing connection: After the metal foil is delivered, it is smoothly pasted on the substrate and can be overprinted immediately. It can be used in three processes such as local hot stamping, full version hot stamping, and even dot gradation. Even stamping can be used for large area stamping process design.
Traditional hot stamping: Traditional hot stamping cannot be combined with multiple hot stamping processes, and the uniformity of large area hot stamping is poor.
Second, the comparison of cold stamping and metal ink printing process
Before the cold stamping process of the offset printing line appeared, people made improvements in the offset printing process in order to save the hot stamping process, in order to achieve the hot stamping effect. For example, the metal ink printing process, although it can achieve a certain metallic effect, there is still a certain gap from the real hot stamping effect. The reason is that when printing gold and silver, even if there is sufficient ink layer thickness and the best ink, it is impossible to achieve the brightness of hot stamping; in addition, the hot stamped product has a certain sense of unevenness, this effect is for metal ink It is also impossible to achieve in the printing process, which is determined by the pigment fineness of the offset ink. Even the best metal ink, due to the presence of coarser pigment particles, its reflection of light is still mainly scattered light . The hot stamping uses pure metal materials, and its surface is a very pure smooth metal surface. The effect of specular reflection is not comparable to ordinary offset printing, and the final effect is also far from the same.
3. Application prospects of cold stamping for offset printing
The cold stamping of offset printing line surprised everyone from the beginning, and gradually developed to maturity. It has been recognized, recognized and even loved by everyone. With a connected cold-pressing device, packaging and printing factories can enhance the effect of their prints through a "coloring" process; label printing factories can achieve metallic effects on wine, beer, alcoholic beverages, cosmetics and other special labels; publishing Material printing factories can also use the connection cold-scaling technology to efficiently add more effects to the cover of magazines; commercial printing factories can also produce more eye-catching direct mail advertisements, company business cards, annual reports, greeting cards and other printed products. The huge market space will bring a better tomorrow for the offset hot stamping technology.
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