The laser embossing transfer process works by combining UV varnish with an embossed film that has laser micro-recesses. These films can be used multiple times, making the process efficient and cost-effective. After UV curing, the embossed film is removed, leaving behind a patterned surface on the UV varnish that mirrors the original design of the film. This technique enhances visual appeal through light refraction or diffusion, creating a striking 3D effect without the need for heat.
One of the key advantages of laser embossing is its environmental friendliness compared to traditional hot stamping methods. It uses less energy and produces fewer emissions, which makes it a more sustainable option. Additionally, the cost of the embossed film is lower than that of conventional foil, and it can be reused over 30 times, significantly reducing material waste. This method also allows for localized application, meaning only specific areas of a product can be embossed, offering greater flexibility in design. The process itself is straightforward, resulting in a low scrap rate and high efficiency in production.
When using this technology, it's important to pay attention to the quality of the laser embossed film and its compatibility with UV varnish. For optimal results, the film should not undergo corona treatment, as this can affect adhesion. The surface energy of the film should be low—ideally below 32 mN/m—to ensure proper bonding with the UV varnish. The film should also be thin, typically under 18 microns, to maintain flexibility and reduce stress during application. Wider films may cause uneven tension, so careful handling is required. Seam designs must be hidden or nearly invisible to avoid visible imperfections. It’s recommended to use a PP (polypropylene) base film to prevent damage from UV exposure. The UV varnish should have a surface tension similar to that of the PP film to ensure easy removal after curing. A layer thickness of more than 2 microns is ideal, equivalent to a BCM value of over 5. Finally, the embossed film must remain flat when rewound, with clean edges to ensure smooth handling and consistent performance in future applications.
Cold stamping has become the dominant method in self-adhesive label production, accounting for over 80% of all adhesive stamping products. Compared to hot stamping, cold stamping is more energy-efficient and eco-friendly. It allows printing companies to boost productivity, reduce costs, and create a wide range of visual effects by integrating with the first hot stamping process. This versatility makes it a popular choice in the packaging and labeling industry.
When performing cold stamping, several precautions should be taken to ensure quality and accuracy. Avoid applying cold stamping to fields or screen adjustment texts, as well as fine text or reverse text, which may not reproduce clearly. Do not use this method on highly absorbent materials or coated substrates, as they can interfere with adhesion. Also, avoid stamping on screen adjustment graphics or near die-cut patterns, as this could damage the cutting tools or affect the final shape of the product. Excessive pressure during printing can lead to thick lines and misalignment after hot stamping. Additionally, avoid placing stamping graphics near the edges of die-cut patterns, as this may compromise the blade life. Lastly, ensure that the cold foil tension is not too high, as this can cause misregistration or false impressions in the stamped text.
　
The content above was excerpted from the "Printing Technology Packaging and Decoration" issue in the second issue of 2012 published by the printing press. For more detailed information and related articles, please visit the journal channel.
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