Development of the Laser Imprint Transfer Process
The original design of the laser imprint transfer device was developed by a Japanese manufacturer, which relied on a film roll rewinding method. This approach involved significant manual labor and was prone to damage, such as wrinkles or deformations in the laser transfer film. To address these issues, a new type of laser transfer equipment based on a closed-loop film roll system has been introduced to the market. This improved device eliminates the need for frequent lifting of the film roll, reduces labor intensity, and minimizes the risk of film wrinkling or deformation. However, even with this advancement, after more than 10 minutes of operation, the process still requires replacing the closed-loop film roll, which remains a time-consuming task. With the development of the laser embossing transfer process, color printing and laser embossing can now be completed in a single step. When using this integrated system, the representation of the laser holographic image is typically referred to as "Giant Star."
Recently, a new process inspired by the functionality of a music tape has also emerged. This laser holographic pattern positioning laser pressure printing transfer process allows the laser embossed transfer film to be unwound and rewound during the imprinting process. When the film is unwound, the machine automatically stops, and the laser embossed transfer film at the winding position is quickly rewound until it is fully rewound, after which normal printing resumes. This entire process is similar to how a cassette player works—when playback ends, the tape is quickly rewound before starting again.
Process Requirements for Laser Imprint Transfer
The UV varnish used in the laser imprint transfer process must meet specific criteria: it should have moderate viscosity, high purity, and use anhydrous alcohol as a diluent to ensure thorough curing. The base film of the laser transfer material should be made of uniform BOPP or PET film with good image transparency. Through repeated testing, it has been found that anilox rolls with 260 lines per inch provide the best results for UV coating. During UV curing, the surface temperature of the laser transfer film must be carefully controlled between 30°C and 50°C to achieve optimal performance.
　　 The above content is taken from the second edition of 2012, Printing and Packaging Technology, and more related articles can be found in the journal section.
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