The laser embossing transfer process works by combining UV varnish with an embossed film that has laser micro-recesses. This film can be used multiple times, and after UV curing, it is peeled off, leaving behind a cured UV layer that forms a laser micro-groove on the surface. These grooves create visual effects through the refraction or diffusion of natural light, enhancing the overall appearance of the product.
One of the main advantages of the laser embossing transfer technique is its environmental friendliness compared to traditional hot stamping foils. It also offers cost savings, as the laser embossed film is cheaper and reusable more than three times. This method allows for localized embossing, making it ideal for intricate designs. Additionally, the process is simple, resulting in a low scrap rate and improved efficiency.
When using this process, it's important to focus on the quality of the laser embossed film and its compatibility with UV varnish. Key considerations include avoiding corona treatment on the film, as it may affect adhesion. The surface energy of the film should be low (preferably below 32 mN/m) to ensure proper bonding. The film should be thin—typically less than 18 micrometers—and its width should be carefully managed to prevent tension issues. The design of the seams must be hidden or nearly invisible, and the base material should be PP film to avoid UV degradation. The UV varnish should have a surface tension similar to that of PP film for better peeling. A layer thickness of over 2 micrometers is recommended, equivalent to an anilox roller BCM value above 5. Lastly, the film must remain flat during rewinding, with clean edges for smooth handling in future steps.
Cold stamping products make up more than 80% of adhesive label stamping solutions. This is mainly due to their energy efficiency and eco-friendliness compared to hot stamping. They help printing companies boost production capacity, reduce costs, and allow for versatile hot stamping effects when combined with other processes.
When performing cold stamping, certain precautions should be taken. Avoid applying cold stamping to fields, screen adjustments, or fine text simultaneously. Also, steer clear of absorptive materials and coated substrates, as they may not bond well. Do not apply cold stamping to screen adjustment graphics or near die-cut patterns, as this could damage the cutting tools. Excessive pressure should be avoided to prevent thick lines and misalignment after hot stamping. Additionally, ensure that the cold foil tension is not too high, as this can lead to inaccurate or false stamping results.
　　 The above content was excerpted from the "Printing Technology Packaging and Decoration" issue in the second issue of 2012 by the Printing Press. For more information on this journal, please visit the official journal channel.
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