After years of hard work, many companies have successfully established their own thermal transfer printing market in various ways. From barcodes produced with digital printing machines to plastic ornaments, the application range of thermal transfer technology is constantly expanding.
The benefits of thermal transfer technology are many: there is no need to use a printing plate or screen; it can be used for personalized printing of short and medium versions; high resolution; it can make a wider color gamut and opaque white background by a new generation of digital printing presses color. Some forward-thinking users have developed new applications for thermal transfer.
Because the adhesive used for thermal transfer printing can be dried quickly, people can immediately handle, assemble and package the mold produced in this way. This is much simpler and more flexible than the in-mold decoration method used previously. Some users will let their researchers develop new metal foil materials, and choose different primers and adhesives according to different substrates, such as using alcohol-resistant paint on cosmetic bottles.
Digital printing brings advantages to thermal transfer. The advantage of digital printing is that it can print a small number of color products at a higher resolution, and can also add a white background color to it when needed, which can give designers a short time in design. The printing of work pieces brings more creative space.
According to users, the transfer film of thermal transfer printing is very thin and looks the same as printed directly on the surface of the substrate. Our common paper labels or plastic labels are usually separate from the product itself, but as some brands, especially cosmetics or pharmaceutical companies, are increasingly concerned about counterfeit and shoddy problems, this kind of heat that seems to be directly printed on the product Transfer labels also have a greater competitive advantage.
Before the advent of digital printing technology, the patterns used in the thermal transfer process were either printed on a low-quality screen printing machine or printed on a gravure printing machine with solvent-based inks. Although this was of higher quality, the printing cylinder The cost is high, only suitable for long-form printing. Digital printers can print small batches of variable data, so brands can print the names of different stores, bars, restaurants, or sporting events on product packaging as needed.
How thermal transfer achieves thermal transfer patterns is usually printed on a roll of plastic film. Once these patterns are transferred to the final article, these films are useless. In general, one side of the thermal transfer film is usually coated with a layer of heat-activated coating, and a very thin primer is formed on it to protect the image surface. The user can put the blank metal foil in the printing machine, and then print it on the primer. The heating process of the printing press will cause the toner particles to solidify and adhere to the primer.
After printing, the metal foil will be rewound and sent to the coating unit, where it will be coated with a layer of heat-activated adhesive. Depending on the application of the thermal transfer product, the printing plant can choose different adhesives. At first they only used metal foil on hard plastics, but now they can also use metal foil on some soft plastics (polypropylene and polyethylene).
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