What are the special inks used in printing? Where is the difference between hot stamping and cold stamping?.
Special inks are classified as liquid crystal ink, scented ink, pearlescent ink and power generating luminescent ink,Luminous ink, ink, ink scratch card copying paper.
The difference between hot stamping and cold stamping:1, cold stamping speed, the fastest speed of 50 - 60 meters / minute, while the average round stamping round speed is only 20 - 30 meters / minute.2, cold stamping materials for a wide range of applications, such as heat sensitive paper and a part of film materials for cold stamping.3, because the use of general flexo printing plate instead of expensive metal plate roller, so greatly reduce the gilding version of the production costs, cold stamping costs only about 1/10 of ordinary gilding.4, because the heating roller is not used, the energy is saved and the consumption is reduced.5, because the metal plate roller is not produced, the chemical etching process is abandoned, so the pollution is reduced, and the environmental protection is favorable.6, the use of traditional bronzing process to make metal plate roller needs one to two weeks, and cold stamping process only a short time, so that the production cycle is greatly shortened.
The key technology of cold stamping process is UV binder and special anodized aluminum foil. At present, the import and domestic UV adhesives have been sold in our market, and the production process of anodized aluminum without hot melt adhesive is very simple. We believe that with the development of printing industry and the application of various industries, the application of cold Gilding Technology in our country has also been greatly developed.
Cold stamping process by adhesives, metal foil and other conditions restrictions, there are some shortcomings, such as:1, the printing of cold stamping must be painted or covered with wax, used to protect the gilt pattern, increase the cost of gilding and process complexity.2, cold stamping process is not suitable for the use of shrinkage characteristics of the film material, such as PVC, PE and other materials.3, because UV binder leveling is poor, so the dry surface is not absolute plane, lead to transfer on its metal foil surface brightness difference, there is diffuse reflection phenomenon. That is to say, the effect of cold gilding is not as good as that of traditional hot stamping.Cold stamping process is suitable for all kinds of narrow width printing machines. Because of its simple process and convenient installation of equipment in attached middle schools, it is a promising new gilding process.
